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Landoulsi J. Surface (bio)-functionalization of metallic materials: How to cope with real interfaces? Adv Colloid Interface Sci 2024; 325:103054. [PMID: 38359674 DOI: 10.1016/j.cis.2023.103054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 11/21/2023] [Accepted: 11/22/2023] [Indexed: 02/17/2024]
Abstract
Metallic materials are an important class of biomaterials used in various medical devices, owing to a suitable combination of their mechanical properties. The (bio)-functionalization of their surfaces is frequently performed for biocompatibility requirements, as it offers a powerful way to control their interaction with biological systems. This is particularly important when physicochemical processes and biological events, mainly involving proteins and cells, are initiated at the host-material interface. This review addresses the state of "real interfaces" in the context of (bio)-functionalization of metallic materials, and the necessity to cope with it to avoid frequent improper evaluation of the procedure used. This issue is, indeed, well-recognized but often neglected and emerges from three main issues: (i) ubiquity of surface contamination with organic compounds, (ii) reactivity of metallic surfaces in biological medium, and (iii) discrepancy in (bio)-functionalization procedures between expectations and reality. These disturb the assessment of the strategies adopted for surface modifications and limit the possibilities to provide guidelines for their improvements. For this purpose, X-ray photoelectrons spectroscopy (XPS) comes to the rescue. Based on significant progresses made in methodological developments, and through a large amount of data compiled to generate statistically meaningful information, and to insure selectivity, precision and accuracy, the state of "real interfaces" is explored in depth, while looking after the two main constituents: (i) the bio-organic adlayer, in which the discrimination between the compounds of interest (anchoring molecules, coupling agents, proteins, etc) and organic contaminants can be made, and (ii) the metallic surface, which undergoes dynamic processes due to their reactivity. Moreover, through one of the widespread (bio)-functionalization strategy, given as a case study, a particular attention is devoted to describe the state of the interface at different stages (composition, depth distribution of contaminants and (bio)compounds of interest) and the mode of protein retention. It is highlighted, in particular, that the occurrence or improvement of bioactivity does not demonstrate that the chemical schemes worked in reality. These aspects are particularly essential to make progress on the way to choose the suitable (bio)-functionalization strategy and to provide guidelines to improve its efficiency.
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Affiliation(s)
- Jessem Landoulsi
- Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface, 4 place Jussieu, F-75005 Paris, France; Laboratoire de Biomécanique & Bioingénierie, CNRS, Université de Technologie de Compiègne, 20529 F-60205 Compiègne Cedex, France.
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2
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Richards C, Ollero AD, Daly P, Delauré Y, Regan F. Disruption of diatom attachment on marine bioinspired antifouling materials based on Brill (Scophthalmus rhombus). THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169348. [PMID: 38104837 DOI: 10.1016/j.scitotenv.2023.169348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 11/30/2023] [Accepted: 12/11/2023] [Indexed: 12/19/2023]
Abstract
Bioinspired surfaces, due to their nano and micro topographical features, offer a promising approach for the development of novel antifouling solutions. The study of surface topography has gained popularity in recent years, demonstrating significant potential in mimicking natural structures that could be manufactured for application in the marine environment. This research focuses on investigating the antifouling (AF) performance of bio-inspired micro-textures inspired by Brill fish scales, Scophthalmus rhombus, under static laboratory conditions, using two common fouling diatom species, Amphora coffeaeformis and Nitzschia ovalis. In this study, we evaluate six engineered surfaces, inspired by Brill fish scales, fabricated through a 2-photon polymerization (2PP) process, for their potential as antifouling solutions. The investigation explores the settlement behaviour of microfouling organisms, comparing these mechanisms with theoretical models to guide the future design of antifouling materials. A key emphasis is placed on the impact of surface topography on the disruption of cellular response. Our results suggest that cells smaller than 10 μm, exceeding the peak-to-peak distances between surface features, comfortably position themselves between adjacent features. On the other hand, as peak-to-peak distances decrease, cells shift from settling within uniform gaps to resting on top of surface features. Surfaces with sharpened edges demonstrate a more substantial reduction in diatom attachments compared to those with rounded edges. Furthermore, all micro-textured surfaces exhibit a significant decrease in colony formation compared to control samples. In conclusion, this study shows the potential to manipulate cellular responses through topographical features, providing valuable insights for the design of effective antifouling materials. The results contribute to the growing body of knowledge in biomimetic antifouling strategies using a novel marine organism for inspiration to design practical structures that can be replicated.
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Affiliation(s)
- Chloe Richards
- DCU Water Institute, School of Chemical Sciences, DCU, Glasnevin, Dublin, Ireland
| | | | - Philip Daly
- School of Mechanical & Manufacturing Engineering, DCU, Glasnevin, Dublin, Ireland
| | - Yan Delauré
- School of Mechanical & Manufacturing Engineering, DCU, Glasnevin, Dublin, Ireland
| | - Fiona Regan
- DCU Water Institute, School of Chemical Sciences, DCU, Glasnevin, Dublin, Ireland.
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3
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Karyani TZ, Ghattavi S, Homaei A. Application of enzymes for targeted removal of biofilm and fouling from fouling-release surfaces in marine environments: A review. Int J Biol Macromol 2023; 253:127269. [PMID: 37804893 DOI: 10.1016/j.ijbiomac.2023.127269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 09/07/2023] [Accepted: 10/04/2023] [Indexed: 10/09/2023]
Abstract
Biofouling causes adverse issues in underwater structures including ship hulls, aquaculture cages, fishnets, petroleum pipelines, sensors, and other equipment. Marine constructions and vessels frequently are using coatings with antifouling properties. During the previous ten years, several alternative strategies have been used to combat the biofilm and biofouling that have developed on different abiotic or biotic surfaces. Enzymes have frequently been suggested as a cost-effective, substitute, eco-friendly, for conventional antifouling and antibiofilm substances. The destruction of sticky biopolymers, biofilm matrix disorder, bacterial signal interference, and the creation of biocide or inhibitors are among the catalytic reactions of enzymes that really can successfully prevent the formation of biofilms. In this review we presented enzymes that have antifouling and antibiofilm properties in the marine environment like α-amylase, protease, lysozymes, glycoside hydrolase, aminopeptidases, oxidase, haloperoxidase and lipases. We also overviewed the function, benefits and challenges of enzymes in removing biofouling. The reports suggest enzymes are good candidates for marine environment. According to the findings of a review of studies in this field, none of the enzymes were able to inhibit the development of biofilm by a site marine microbial community when used alone and we suggest using other enzymes or a mixture of enzymes for antifouling and antibiofilm purposes in the sea environment.
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Affiliation(s)
- Tayebeh Zarei Karyani
- Department of Marine Biology, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran
| | - Saba Ghattavi
- Fisheries Department, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran
| | - Ahmad Homaei
- Department of Marine Biology, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran.
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4
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Fiskal A, Shuster J, Fischer S, Joshi P, Raghunatha Reddy L, Wulf SE, Kappler A, Fischer H, Herrig I, Meier J. Microbially influenced corrosion and rust tubercle formation on sheet piles in freshwater systems. Environ Microbiol 2023; 25:1796-1815. [PMID: 37145936 DOI: 10.1111/1462-2920.16393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 04/19/2023] [Indexed: 05/07/2023]
Abstract
The extent of how complex natural microbial communities contribute to metal corrosion is still not fully resolved, especially not for freshwater environments. In order to elucidate the key processes, we investigated rust tubercles forming massively on sheet piles along the river Havel (Germany) applying a complementary set of techniques. In-situ microsensor profiling revealed steep gradients of O2 , redox potential and pH within the tubercle. Micro-computed tomography and scanning electron microscopy showed a multi-layered inner structure with chambers and channels and various organisms embedded in the mineral matrix. Using Mössbauer spectroscopy we identified typical corrosion products including electrically conductive iron (Fe) minerals. Determination of bacterial gene copy numbers and sequencing of 16S rRNA and 18S rRNA amplicons supported a densely populated tubercle matrix with a phylogenetically and metabolically diverse microbial community. Based on our results and previous models of physic(electro)chemical reactions, we propose here a comprehensive concept of tubercle formation highlighting the crucial reactions and microorganisms involved (such as phototrophs, fermenting bacteria, dissimilatory sulphate and Fe(III) reducers) in metal corrosion in freshwaters.
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Affiliation(s)
- Annika Fiskal
- Department U2-Microbial Ecology, Federal Institute of Hydrology, Koblenz, Germany
| | - Jeremiah Shuster
- Tübingen Structural Microscopy, University of Tübingen, Tübingen, Germany
- Geomicrobiology, Department of Geosciences, University of Tübingen, Tübingen, Germany
| | - Stefan Fischer
- Tübingen Structural Microscopy, University of Tübingen, Tübingen, Germany
- Geomicrobiology, Department of Geosciences, University of Tübingen, Tübingen, Germany
| | - Prachi Joshi
- Geomicrobiology, Department of Geosciences, University of Tübingen, Tübingen, Germany
| | | | - Sven-Erik Wulf
- Section B2-Steel Structures and Corrosion Protection, Federal Waterways Engineering and Research Institute, Karlsruhe, Germany
| | - Andreas Kappler
- Tübingen Structural Microscopy, University of Tübingen, Tübingen, Germany
- Geomicrobiology, Department of Geosciences, University of Tübingen, Tübingen, Germany
- Cluster of Excellence: EXC 2124: Controlling Microbes to Fight Infection, Tübingen, Germany
| | - Helmut Fischer
- Department U2-Microbial Ecology, Federal Institute of Hydrology, Koblenz, Germany
| | - Ilona Herrig
- Department G3-Ecotoxicology, Federal Institute of Hydrology, Koblenz, Germany
| | - Jutta Meier
- Institute for Integrated Natural Sciences, University Koblenz, Koblenz, Germany
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Zheng P, Kumadaki K, Quek C, Lim ZH, Ashenafi Y, Yip ZT, Newby J, Alverson AJ, Jie Y, Jedd G. Cooperative motility, force generation and mechanosensing in a foraging non-photosynthetic diatom. Open Biol 2023; 13:230148. [PMID: 37788707 PMCID: PMC10547550 DOI: 10.1098/rsob.230148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 09/01/2023] [Indexed: 10/05/2023] Open
Abstract
Diatoms are ancestrally photosynthetic microalgae. However, some underwent a major evolutionary transition, losing photosynthesis to become obligate heterotrophs. The molecular and physiological basis for this transition is unclear. Here, we isolate and characterize new strains of non-photosynthetic diatoms from the coastal waters of Singapore. These diatoms occupy diverse ecological niches and display glucose-mediated catabolite repression, a classical feature of bacterial and fungal heterotrophs. Live-cell imaging reveals deposition of secreted extracellular polymeric substance (EPS). Diatoms moving on pre-existing EPS trails (runners) move faster than those laying new trails (blazers). This leads to cell-to-cell coupling where runners can push blazers to make them move faster. Calibrated micropipettes measure substantial single-cell pushing forces, which are consistent with high-order myosin motor cooperativity. Collisions that impede forward motion induce reversal, revealing navigation-related force sensing. Together, these data identify aspects of metabolism and motility that are likely to promote and underpin diatom heterotrophy.
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Affiliation(s)
- Peng Zheng
- Temasek Life Sciences Laboratory, 117604 Singapore
| | - Kayo Kumadaki
- Department of Physics, National University of Singapore, 117542 Singapore
- Mechanobiology Institute, National University of Singapore, 117411 Singapore
| | | | - Zeng Hao Lim
- Temasek Life Sciences Laboratory, 117604 Singapore
- Department of Biological Sciences, National University of Singapore, 117543 Singapore, Singapore
| | - Yonatan Ashenafi
- Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2G1
| | - Zhi Ting Yip
- Department of Biological Sciences, National University of Singapore, 117543 Singapore, Singapore
| | - Jay Newby
- Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2G1
| | - Andrew J. Alverson
- Department of Biological Sciences, University of Arkansas, SCEN 601, Fayetteville, AR 72701, USA
| | - Yan Jie
- Department of Physics, National University of Singapore, 117542 Singapore
- Mechanobiology Institute, National University of Singapore, 117411 Singapore
| | - Gregory Jedd
- Temasek Life Sciences Laboratory, 117604 Singapore
- Department of Biological Sciences, National University of Singapore, 117543 Singapore, Singapore
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6
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Morgan RN, Ali AA, Alshahrani MY, Aboshanab KM. New Insights on Biological Activities, Chemical Compositions, and Classifications of Marine Actinomycetes Antifouling Agents. Microorganisms 2023; 11:2444. [PMID: 37894102 PMCID: PMC10609280 DOI: 10.3390/microorganisms11102444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 09/27/2023] [Accepted: 09/27/2023] [Indexed: 10/29/2023] Open
Abstract
Biofouling is the assemblage of undesirable biological materials and macro-organisms (barnacles, mussels, etc.) on submerged surfaces, which has unfavorable impacts on the economy and maritime environments. Recently, research efforts have focused on isolating natural, eco-friendly antifouling agents to counteract the toxicities of synthetic antifouling agents. Marine actinomycetes produce a multitude of active metabolites, some of which acquire antifouling properties. These antifouling compounds have chemical structures that fall under the terpenoids, polyketides, furanones, and alkaloids chemical groups. These compounds demonstrate eminent antimicrobial vigor associated with antiquorum sensing and antibiofilm potentialities against both Gram-positive and -negative bacteria. They have also constrained larval settlements and the acetylcholinesterase enzyme, suggesting a strong anti-macrofouling activity. Despite their promising in vitro and in vivo biological activities, scaled-up production of natural antifouling agents retrieved from marine actinomycetes remains inapplicable and challenging. This might be attributed to their relatively low yield, the unreliability of in vitro tests, and the need for optimization before scaled-up manufacturing. This review will focus on some of the most recent marine actinomycete-derived antifouling agents, featuring their biological activities and chemical varieties after providing a quick overview of the disadvantages of fouling and commercially available synthetic antifouling agents. It will also offer different prospects of optimizations and analysis to scale up their industrial manufacturing for potential usage as antifouling coatings and antimicrobial and therapeutic agents.
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Affiliation(s)
- Radwa N. Morgan
- National Centre for Radiation Research and Technology (NCRRT), Drug Radiation Research Department, Egyptian Atomic Energy Authority (EAEA), Ahmed El-Zomor St, Cairo 11787, Egypt;
| | - Amer Al Ali
- Department of Clinical Laboratory Sciences, Faculty of Applied Medical Sciences, University of Bisha, 255, Al Nakhil, Bisha 67714, Saudi Arabia;
| | - Mohammad Y. Alshahrani
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Khalid University, Abha 9088, Saudi Arabia;
| | - Khaled M. Aboshanab
- Microbiology and Immunology Department, Faculty of Pharmacy, Ain Shams University, African Union Organization Street, Abbassia, Cairo 11566, Egypt
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7
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Sun W, Liu T, Zhang X, Zhang X, Yan Q, Yin J, Luan S. Aquatic Diatoms-Inspired Universal Adhesive Coacervates Triggered by Water. Adv Healthc Mater 2023; 12:e2300669. [PMID: 37314335 DOI: 10.1002/adhm.202300669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 05/31/2023] [Indexed: 06/15/2023]
Abstract
Adhesives with strong underwater adhesion performance are urgently needed in diverse areas. However, designing adhesives with long-term stability to diverse materials underwater in a facile way is challenging. Here, inspired by aquatic diatoms, a series of novel biomimetic universal adhesives is reported that shows tunable performance with robust and long-lasting stable underwater adhesion to various substrates, including wet biological tissues. The versatile and robust wet-contact adhesives are pre-polymerized by N-[tris(hydroxymethyl)methyl]acrylamide, n-butyl acrylate, and methylacrylic acid in dimethyl sulfoxide and spontaneously coacervated in water triggered by solvent exchange. The synergistic interaction between hydrogen bonding and hydrophobic interaction allows the hydrogels with instant and strong adhesion to various substrate surfaces. The slowly formed covalent bonds enhance cohesion and adhesion strength in hours. The spatial and timescale-dependent adhesion mechanism endows the adhesives with strong and long-lasting stable underwater adhesion to be coupled with fault-tolerant convenient surgical operations.
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Affiliation(s)
- Wen Sun
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Tingwu Liu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Xieli Zhang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Xu Zhang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Qiuyan Yan
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Jinghua Yin
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Shifang Luan
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, 230026, China
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8
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Park J, Kim T, Muhammad BL, Ki JS. Ship Hull-Fouling Diatoms on Korean Research Vessels Revealed by Morphological and Molecular Methods, and Their Environmental Implications. J Microbiol 2023; 61:615-626. [PMID: 37227623 DOI: 10.1007/s12275-023-00055-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 04/12/2023] [Accepted: 04/28/2023] [Indexed: 05/26/2023]
Abstract
Ship biofouling is one of the main vectors for the introduction and global spread of non-indigenous organisms. Diatoms were the early colonizers of ship hulls; however, their community composition on ships is poorly understood. Herein, we investigated the diatom community on the hull samples collected from two Korean research vessels Isabu (IRV) and Onnuri (ORV) on September 2 and November 10, 2021, respectively. IRV showed low cell density (345 cells/cm2) compared to ORV (778 cells/cm2). We morphologically identified more than 15 species of diatoms from the two research vessels (RVs). The microalgae in both RVs were identified as Amphora, Cymbella, Caloneis, Halamphora, Navicula, Nitzschia, and Plagiogramma. Of them, the genus Halamphora was found to be predominant. However, both RVs had a varied dominant species with a significant difference in body size; Halamphora oceanica dominated at IRV, and Halamphora sp. at ORV, respectively. Molecular cloning showed similar results to morphological analysis, in which Halamphora species dominated in both RVs. The hull-attached species were distinct from species found in the water column. These results revealed diatoms communities that are associated with ship hull-fouling at an early stage of biofilm formation. Moreover, ships arriving from different regions could show some variation in species composition on their hull surfaces, with the potential for non-indigenous species introduction.
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Affiliation(s)
- Jaeyeong Park
- Department of Life Science, Sangmyung University, Seoul, 03016, Republic of Korea
| | - Taehee Kim
- Department of Life Science, Sangmyung University, Seoul, 03016, Republic of Korea
| | | | - Jang-Seu Ki
- Department of Life Science, Sangmyung University, Seoul, 03016, Republic of Korea.
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9
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Braga CR, Richard KN, Gardner H, Swain G, Hunsucker KZ. Investigating the Impacts of UVC Radiation on Natural and Cultured Biofilms: An assessment of Cell Viability. Microorganisms 2023; 11:1348. [PMID: 37317322 DOI: 10.3390/microorganisms11051348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 04/26/2023] [Accepted: 05/10/2023] [Indexed: 06/16/2023] Open
Abstract
Biofilms are conglomerates of cells, water, and extracellular polymeric substances which can lead to various functional and financial setbacks. As a result, there has been a drive towards more environmentally friendly antifouling methods, such as the use of ultraviolet C (UVC) radiation. When applying UVC radiation, it is important to understand how frequency, and thus dose, can influence an established biofilm. This study compares the impacts of varying doses of UVC radiation on both a monocultured biofilm consisting of Navicula incerta and field-developed biofilms. Both biofilms were exposed to doses of UVC radiation ranging from 1626.2 mJ/cm2 to 9757.2 mJ/cm2 and then treated with a live/dead assay. When exposed to UVC radiation, the N. incerta biofilms demonstrated a significant reduction in cell viability compared to the non-exposed samples, but all doses had similar viability results. The field biofilms were highly diverse, containing not only benthic diatoms but also planktonic species which may have led to inconsistencies. Although they are different from each other, these results provide beneficial data. Cultured biofilms provide insight into how diatom cells react to varying doses of UVC radiation, whereas the real-world heterogeneity of field biofilms is useful for determining the dosage needed to effectively prevent a biofilm. Both concepts are important when developing UVC radiation management plans that target established biofilms.
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Affiliation(s)
- Cierra R Braga
- Center for Corrosion and Biofouling Control, Florida Institute of Technology, Melbourne, FL 32901, USA
| | - Kailey N Richard
- Center for Corrosion and Biofouling Control, Florida Institute of Technology, Melbourne, FL 32901, USA
| | - Harrison Gardner
- Center for Corrosion and Biofouling Control, Florida Institute of Technology, Melbourne, FL 32901, USA
| | - Geoffrey Swain
- Center for Corrosion and Biofouling Control, Florida Institute of Technology, Melbourne, FL 32901, USA
| | - Kelli Z Hunsucker
- Center for Corrosion and Biofouling Control, Florida Institute of Technology, Melbourne, FL 32901, USA
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Xianbiao J, Baohong C, Kang W, Conghui P, Yahui G, Hui L. A new microalgae community — Epimicroplastic microalgae (EMP-MA). ALGAL RES 2023. [DOI: 10.1016/j.algal.2023.103059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
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11
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Abbriano R. Gliding toward new discoveries in diatom adhesion and motility. JOURNAL OF PHYCOLOGY 2023; 59:52-53. [PMID: 36779557 DOI: 10.1111/jpy.13309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
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12
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Pezzato L, Settimi AG, Fanchin D, Moschin E, Moro I, Dabalà M. Effect of Cu Addition on the Corrosion and Antifouling Properties of PEO Coated Zinc-Aluminized Steel. MATERIALS (BASEL, SWITZERLAND) 2022; 15:ma15227895. [PMID: 36431381 PMCID: PMC9692627 DOI: 10.3390/ma15227895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 11/03/2022] [Accepted: 11/04/2022] [Indexed: 05/16/2023]
Abstract
In the present work, Plasma Electrolytic Oxidation (PEO) coatings were produced on zinc-aluminized carbon steels (Galvalume commercial treatment). In addition, copper particles of various sizes were introduced into the coating in order to produce samples with antifouling properties. The particles were successfully embedded into the coating. A higher number of embedded particles was observed when these are in sub-micrometric size and obtained in pulsed current. The presence of particles produces significant antifouling properties on the sample's surfaces during the first 20 days of immersion. The presence of the particles reduces the corrosion resistance in comparison to the samples PEO coated without the particles; however, the corrosion resistance remain higher than the one of the untreated sample.
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Affiliation(s)
- Luca Pezzato
- Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
- Correspondence: ; Tel.: +39-0498275498
| | - Alessio Giorgio Settimi
- Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
| | - Daniel Fanchin
- Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
| | - Emanuela Moschin
- Department of Biology, University of Padova, Via U. Bassi, 58/B, 35121 Padova, Italy
| | - Isabella Moro
- Department of Biology, University of Padova, Via U. Bassi, 58/B, 35121 Padova, Italy
| | - Manuele Dabalà
- Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
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Suzuki S, Ota S, Yamagishi T, Tuji A, Yamaguchi H, Kawachi M. Rapid transcriptomic and physiological changes in the freshwater pennate diatom Mayamaea pseudoterrestris in response to copper exposure. DNA Res 2022; 29:6748870. [PMID: 36197113 PMCID: PMC9724779 DOI: 10.1093/dnares/dsac037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 09/27/2022] [Accepted: 10/03/2022] [Indexed: 12/12/2022] Open
Abstract
Diatoms function as major primary producers, accumulating large amounts of biomass in most aquatic environments. Given their rapid responses to changes in environmental conditions, diatoms are used for the biological monitoring of water quality and for performing ecotoxicological tests in aquatic ecosystems. However, the molecular basis for their toxicity to chemical compounds remains largely unknown. Here, we sequenced the genome of a freshwater diatom, Mayamaea pseudoterrestris NIES-4280, which has been proposed as an alternative strain of Navicula pelliculosa UTEX 664 for performing the Organisation for Economic Co-operation and Development ecotoxicological test. This study shows that M. pseudoterrestris has a small genome and carries the lowest number of genes among freshwater diatoms. The gene content of M. pseudoterrestris is similar to that of the model marine diatom, Phaeodactylum tricornutum. Genes related to cell motility, polysaccharide metabolism, oxidative stress alleviation, intracellular calcium signalling, and reactive compound detoxification showed rapid changes in their expression patterns in response to copper exposure. Active gliding motility was observed in response to copper addition, and copper exposure decreased intracellular calcium concentration. These findings enhance our understanding of the environmental adaptation of diatoms, and elucidate the molecular basis of toxicity of chemical compounds in algae.
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Affiliation(s)
| | - Shuhei Ota
- Biodiversity Division, National Institute for Environmental Studies, Tsukuba, Japan
| | - Takahiro Yamagishi
- Health and Environmental Risk Division, National Institute for Environmental Studies, Tsukuba, Japan
| | - Akihiro Tuji
- Department of Botany, National Museum of Nature and Science, Tsukuba, Japan
| | - Haruyo Yamaguchi
- Biodiversity Division, National Institute for Environmental Studies, Tsukuba, Japan
| | - Masanobu Kawachi
- Biodiversity Division, National Institute for Environmental Studies, Tsukuba, Japan
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Si C, Hu G, Jiang W, Sun P, Cao J, Ji R, Li AM, Zhang Q. Hydrophobic Biodegradable Hyperbranched Copolymers with Excellent Marine Diatom Resistance. Biomacromolecules 2022; 23:4327-4338. [PMID: 36069679 DOI: 10.1021/acs.biomac.2c00779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
As the utilization of degradable polymer coatings increased, the accompanying trade-off between good degradability and high-efficiency antidiatom adhesion due to their hydrophobic nature remains unresolved. The study presents a new hydrophobic surface-fragmenting coating consisting of degradable hyperbranched polymers (hereafter denoted as h-LLAx) synthesized by reversible complexation-mediated copolymerization with isobornyl acrylate (IBOA) and divinyl-functional oligomeric poly(l-lactide) (OLLA-V2), both derived from biomass, that exhibited superior resistance (∼0 cell mm-2) to marine diatom Navicula incerta (N. incerta) attachment with higher OLLA content. The combined impact of the microscale hollow semisphere micelles that self-assembled degradable hyperbranched copolymers and hydrolysis-driven self-renewable surfaces following immersion in seawater may account for the remarkable resistance of h-LLAx coatings against N. incerta. Detailed investigations were conducted across multiple perspectives, from hydrolytic degradation to broad-spectrum antibacterial attachment to ecotoxicity assessment. The excellent features of high resistance to marine diatoms and bacterial attachment, degradability, and environmental friendliness make the as-prepared h-LLAx coatings widely sought after for antifouling coating applications.
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Affiliation(s)
- Chunying Si
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Guoming Hu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Wei Jiang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Ping Sun
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Jingjing Cao
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Ruixiang Ji
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Ai-Min Li
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Quanxing Zhang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
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15
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Wang K, Lin H, Wang S, Dong X, Sun L, Zhou Q, Chen Y, Su B, Pan Z, Chen B, Gao Y. Species diversity and community structure of microalgae living on microplastics in Luoyuan Bay, China. MARINE POLLUTION BULLETIN 2022; 180:113809. [PMID: 35688065 DOI: 10.1016/j.marpolbul.2022.113809] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 05/25/2022] [Accepted: 05/26/2022] [Indexed: 06/15/2023]
Abstract
This study was carried out in Luoyuan Bay in March 2021. The species composition of microalgae community colonizing on microplastics called epimicroplastic microalgae (EMP-MA) was analyzed and compared with planktonic microalgae (PM) community. The species number of EMP-MA community (73) was higher than that of PM community (56). However Simpson Index and Pielou Evenness Index of EMP-MA community were significantly lower than that of PM community (P < 0.05). Although diatom was the most diverse and abundant taxa in both EMP-MA and PM community, their species compositions were significantly different (P < 0.05). Dominant species were also different between the two communities. Moreover, 12 harmful algal species were found in EMP-MA community, which may drift with microplastics and increase the risks of harmful algal blooms (HABs). This study is helpful to reveal the dispersal mechanism of HABs and potential impacts of EMP-MA on marine ecosystem.
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Affiliation(s)
- Kang Wang
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China; School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Hui Lin
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Sumin Wang
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Xu Dong
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Lin Sun
- School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Qianqian Zhou
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Yanghang Chen
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Baosi Su
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Zhong Pan
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Baohong Chen
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China.
| | - Yahui Gao
- School of Life Sciences, Xiamen University, Xiamen 361102, China.
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16
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Papadatou M, Knight M, Salta M. High-throughput method development for in-situ quantification of aquatic phototrophic biofilms. BIOFOULING 2022; 38:521-535. [PMID: 35791884 DOI: 10.1080/08927014.2022.2094259] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 06/13/2022] [Accepted: 06/21/2022] [Indexed: 06/15/2023]
Abstract
In the maritime field where biofouling has both economic and environmental impacts, in situ quantification methods of biofilm development are of outstanding importance. Indeed, it is challenging to temporally monitor biofilm formation due to the complexity of the marine ecosystem, common inaccessibility of sampling location and lack of standardized techniques. Here, an artificial polymeric surface was tested in situ and in vitro against natural phototrophic biofilms and monoculture biofilms using plate reader fluorescence. The suitability of the developed method was verified using fluorescence microscopy coupled with image analysis - a common quantification technique - demonstrating a strong correlation between the tested methods. The results indicated the efficiency of inherent chlorophyll fluorescence in quantifying undisturbed phototrophic biofilms in field and laboratory conditions using microplate reader. This work demonstrated that the suggested approach is promising for biofilm high-throughput testing, and therefore has the potential to be used in several research and industrial sectors for monitoring phototrophic biofilm development.
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Affiliation(s)
- Maria Papadatou
- School of Biological Sciences, University of Portsmouth, Portsmouth, UK
- Laboratory of Plant and Environmental Biotechnology, Department of Biochemistry and Biotechnology, University of Thessaly, Larissa, Greece
| | - Mollie Knight
- School of Biological Sciences, University of Portsmouth, Portsmouth, UK
| | - Maria Salta
- School of Biological Sciences, University of Portsmouth, Portsmouth, UK
- Department of MIC and Biofilm Research, Endures, Den Helder, The Netherlands
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17
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Djaoudi K, Onrubia JAT, Boukra A, Guesnay L, Portas A, Barry-Martinet R, Angeletti B, Mounier S, Lenoble V, Briand JF. Seawater copper content controls biofilm bioaccumulation and microbial community on microplastics. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 814:152278. [PMID: 34902408 DOI: 10.1016/j.scitotenv.2021.152278] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 12/01/2021] [Accepted: 12/05/2021] [Indexed: 06/14/2023]
Abstract
The adsorption of trace metals on microplastics (MPs) is affected by the presence of surficial biofilms but their interactions are poorly understood. Here, we present the influence of Cu levels in real seawater (Toulon Bay, NW Mediterranean Sea) on microbial communities and Cu content of the resulting biofilms grown during incubation experiments on high density polyethylene. Two sets of incubation experiments were run with seawater supplied with MPs, sampled in two sites with contrasting Cu levels: Pt12 (most contaminated site) and Pt41P (less contaminated site). For each incubation experiment, 5 treatments were considered differing in Cu concentrations, ranging between 30 and 400 nM and between 6 and 60 nM, for Pt12 and Pt41p, respectively. A control experiment (filtered at 0.2 μm) was run in parallel for each incubation experiment. We observed that, at the time scale of the incubation period, both prokaryotic and eukaryotic richness and diversity were higher in the biofilms formed from the most contaminated site. In addition, we showed that Cu levels are shaping biofilm communities, evidencing co-occurrence patterns between prokaryotes and eukaryotes with diatoms playing a central role. These differences in biofilm formation were reflected in the amount of bioaccumulated Cu per dry weight of MPs, exhibiting higher values in the most contaminated site. Within this site, the increase of Cu seawater content enhanced its bioaccumulation onto MPs until reaching saturation. This study strongly suggests a striking link between seawater copper content, biofilm community shaping and the resulting Cu bioaccumulation onto MPs.
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Affiliation(s)
- Kahina Djaoudi
- Université de Toulon, Aix Marseille Univ., CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, CS 60584, 83041 Toulon, France; Department of Molecular and Cellular Biology, University of Arizona, Tucson, AZ 85721, USA.
| | - Javier Angel Tesán Onrubia
- Université de Toulon, Aix Marseille Univ., CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, CS 60584, 83041 Toulon, France
| | - Amine Boukra
- Université de Toulon, Aix Marseille Univ., CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, CS 60584, 83041 Toulon, France
| | - Lucas Guesnay
- Laboratoire MAPIEM, EA 4323, Université de Toulon, Toulon, France
| | - Aurélie Portas
- Laboratoire MAPIEM, EA 4323, Université de Toulon, Toulon, France
| | | | - Bernard Angeletti
- Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France
| | - Stéphane Mounier
- Université de Toulon, Aix Marseille Univ., CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, CS 60584, 83041 Toulon, France
| | - Véronique Lenoble
- Université de Toulon, Aix Marseille Univ., CNRS/INSU, IRD, MIO UM 110, Mediterranean Institute of Oceanography, CS 60584, 83041 Toulon, France
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18
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Xu WF, Wu NN, Wu YW, Qi YX, Wei MY, Pineda LM, Ng MG, Spadafora C, Zheng JY, Lu L, Wang CY, Gu YC, Shao CL. Structure modification, antialgal, antiplasmodial, and toxic evaluations of a series of new marine-derived 14-membered resorcylic acid lactone derivatives. MARINE LIFE SCIENCE & TECHNOLOGY 2022; 4:88-97. [PMID: 37073350 PMCID: PMC10077203 DOI: 10.1007/s42995-021-00103-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 04/01/2021] [Indexed: 05/03/2023]
Abstract
Marine natural products play critical roles in the chemical defense of many marine organisms and are essential, reputable sources of successful drug leads. Sixty-seven 14-membered resorcylic acid lactone derivatives 3-27 and 30-71 of the natural product zeaenol (1) isolated from the marine-derived fungus Cochliobolus lunatus were semisynthesized by chlorination, acylation, esterification, and acetalization in one to three steps. The structures of these new derivatives were established by HRESIMS and NMR techniques. All the compounds (1-71) were evaluated for their antialgal and antiplasmodial activities. Among them, 14 compounds displayed antifouling activities against adhesion of the fouling diatoms. In particular, 9 and 34 exhibited strong and selective inhibitory effects against the diatoms Navicula laevissima and Navicula exigua (EC50 = 6.67 and 8.55 μmol/L), respectively, which were similar in efficacy to those of the positive control SeaNine 211 (EC50 = 2.90 and 9.74 μmol/L). More importantly, 38, 39, and 69-71 showed potent antiplasmodial activities against Plasmodium falciparum with IC50 values ranging from 3.54 to 9.72 μmol/L. Very interestingly, the five antiplasmodial derivatives displayed non-toxicity in the cytotoxicity assays and the zebrafish embryos model, thus, representing potential promising antiplasmodial drug agents. The preliminary structure-activity relationships indicated that biphenyl substituent at C-2, acetonide at positions C-5' and C-6', and tri- or tetra-substituted of acyl groups increased the antiplasmodial activity. Therefore, combining evaluation of chemical ecology with pharmacological models will be implemented as a systematic strategy, not only for environmentally friendly antifoulants but also for structurally novel drugs. Supplementary Information The online version contains supplementary material available at 10.1007/s42995-021-00103-0.
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Affiliation(s)
- Wei-Feng Xu
- Key Laboratory of Marine Drugs, the Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao, 266003 China
- Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237 China
- State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao, 266237 China
| | - Na-Na Wu
- Key Laboratory of Marine Drugs, the Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao, 266003 China
- Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237 China
- State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao, 266237 China
| | - Yan-Wei Wu
- Key Laboratory of Marine Drugs, the Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao, 266003 China
- Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237 China
| | - Yue-Xuan Qi
- Key Laboratory of Marine Drugs, the Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao, 266003 China
- Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237 China
- State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao, 266237 China
| | - Mei-Yan Wei
- Key Laboratory of Marine Drugs, the Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao, 266003 China
- Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237 China
| | - Laura M. Pineda
- Center of Cellular and Molecular Biology of Diseases, Instituto de Investigaciones Científcas y Servicios de Alta Tecnología, City of Knowledge, Clayton, Apartado 0816-02852 Panama
| | - Michelle G. Ng
- Center of Cellular and Molecular Biology of Diseases, Instituto de Investigaciones Científcas y Servicios de Alta Tecnología, City of Knowledge, Clayton, Apartado 0816-02852 Panama
| | - Carmenza Spadafora
- Center of Cellular and Molecular Biology of Diseases, Instituto de Investigaciones Científcas y Servicios de Alta Tecnología, City of Knowledge, Clayton, Apartado 0816-02852 Panama
| | - Ji-Yong Zheng
- State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao, 266237 China
| | - Ling Lu
- Key Laboratory of Marine Drugs, the Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao, 266003 China
- Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237 China
| | - Chang-Yun Wang
- Key Laboratory of Marine Drugs, the Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao, 266003 China
- Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237 China
| | - Yu-Cheng Gu
- Syngenta Jealott’s Hill International Research Centre, Bracknell, Berkshire, RG42 6EY UK
| | - Chang-Lun Shao
- Key Laboratory of Marine Drugs, the Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao, 266003 China
- Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237 China
- State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao, 266237 China
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19
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Qiu H, Feng K, Gapeeva A, Meurisch K, Kaps S, Li X, Yu L, Mishra YK, Adelung R, Baum M. Functional Polymer Materials for Modern Marine Biofouling Control. Prog Polym Sci 2022. [DOI: 10.1016/j.progpolymsci.2022.101516] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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20
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Lahiri D, Nag M, Dey A, Sarkar T, Ray RR, Rebezov M, Shariati MA, Thiruvengadam M, Simal‐Gandara J. Immobilized enzymes as potent antibiofilm agent. Biotechnol Prog 2022; 38:e3281. [PMID: 35690881 PMCID: PMC9786792 DOI: 10.1002/btpr.3281] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Revised: 05/03/2022] [Accepted: 06/09/2022] [Indexed: 12/30/2022]
Abstract
Biofilm has been a point of concern in hospitals and various industries. They not only cause various chronic infections but are also responsible for the degradation of various medical appliances. Since the last decade, various alternate strategies are being adopted to combat the biofilm formed on various biotic and abiotic surfaces. The use of enzymes as a potent anti-fouling agent is proved to be of utmost importance as the enzymes can inhibit biofilm formation in an eco-friendly and cost-effective way. The physical and chemical immobilization of the enzyme not only leads to the improvement of thermostability and reusability of the enzyme, but also gains better efficiency of biofilm removal. Immobilization of amylase, cellobiohydrolase, pectinase, subtilisin A and β-N-acetyl-glucosaminidase (DspB) are proved to be most effective in inhibition of biofilm formation and removal of matured biofilm than their free forms. Hence, these immobilized enzymes provide greater eradication of biofilm formed on various surfaces and are coming up to be the potent antibiofilm agent.
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Affiliation(s)
- Dibyajit Lahiri
- Department of BiotechnologyUniversity of Engineering & ManagementKolkataWest BengalIndia
| | - Moupriya Nag
- Department of BiotechnologyUniversity of Engineering & ManagementKolkataWest BengalIndia
| | - Ankita Dey
- Department of MicrobiologyBelle Vue ClinicsKolkataWest BengalIndia
| | - Tanmay Sarkar
- Department of Food Processing Technology, Malda PolytechnicWest Bengal State Council of Technical Education, Govtment of West BengalMalda732102India
| | - Rina Rani Ray
- Department of BiotechnologyMaulana Abul Kalam Azad University of TechnologyHaringhataWest BengalIndia
| | - Maksim Rebezov
- V. M. Gorbatov Federal Research Center for Food SystemsMoscowRussian Federation,Prokhorov General Physics Institute of the Russian Academy of SciencesMoscowRussian Federation,Liaocheng UniversityLiaochengShandongChina
| | - Mohammad Ali Shariati
- Liaocheng UniversityLiaochengShandongChina,Department of Scientific ResearchK. G. Razumovsky Moscow State University of Technologies and Management (The First Cossack University)MoscowRussian Federation
| | - Muthu Thiruvengadam
- Department of Crop ScienceCollege of Sanghuh Life Science, Konkuk UniversitySeoulSouth Korea
| | - Jesus Simal‐Gandara
- Universidade de Vigo, Nutrition and Bromatology GroupAnalytical Chemistry and Food Science Department, Faculty of ScienceOurenseSpain
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21
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Guan Y, Chen R, Sun G, Liu Q, Liu J, Yu J, Lin C, Duan J, Wang J. Crawling and adhesion behavior of Halamphora sp. based on different parts of Folium Sennae-like film: Evaluation of analytical methods for anti-diatom experimental results. Micron 2021; 152:103178. [PMID: 34801958 DOI: 10.1016/j.micron.2021.103178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 10/30/2021] [Accepted: 11/02/2021] [Indexed: 10/19/2022]
Abstract
Anti-diatom testing is a basic method to evaluate the anti-fouling performance of coatings. Many existing results of anti-diatom performances are evaluated based on their attachment number or coverage area, ignoring the influence of the crawling and adhesion behavior of diatoms on the analysis results. Here, a Folium Sennae-like film with multiple structural units was prepared by considering the influence of diatom attachment behaviors on the analysis results. The anti-diatom performances of different parts (divided and called four parts: edge, surface, cross striation, and vertical pattern) on the Folium Sennae-like film were evaluated using the counting and area methods. Obviously, the anti-diatom performance of the Folium Sennae-like film was superior to that of epoxy resin without structure. Under equal areas, the average numbers of diatoms on the cross striation and the vertical pattern were similar to the surface. It was found that the attachment behavior of Halamphora sp. is affected by microstructure units, rather than the combined structure of which the scale is much larger than that of diatoms. Meanwhile, the average attachment area for the unit number of diatoms was calculated. The diatom attachment area without microstructure, surface, cross striation, or vertical pattern was 81.751, 106.950, 73.904, and 84.376 μm2, respectively. Moreover, the static and dynamic motion behaviors of Halamphora sp. were studied, and the theory for Halamphora sp. attachment was modeled in three dimensions. The variable morphology of Halamphora sp. lead to inaccurate results for diatom analyses based on the counting and area methods, which is summarized here. This study discusses the evaluation method of coatings by anti-diatom performance, further promoting the research of diatoms in the field of antifouling.
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Affiliation(s)
- Yu Guan
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China
| | - Rongrong Chen
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China; Shandong Key Laboratory of Corrosion Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China.
| | - Gaohui Sun
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China
| | - Qi Liu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China
| | - Jingyuan Liu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China
| | - Jing Yu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China
| | - Cunguo Lin
- State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, 266101, China
| | - Jizhou Duan
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China; Key Lab Marine Environm Corros & Biofouling, Chinese Academy of Sciences Institute of Oceanology, Qingdao, 266071, China
| | - Jun Wang
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China.
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22
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Du GY, Zhong XF, Dupuy C, Che S, Lavaud J. Diuron effects on photosynthesis and vertical migration of microphytobenthos: Potential rapid bioassessment of herbicide toxicity in coastal sediments. MARINE POLLUTION BULLETIN 2021; 170:112619. [PMID: 34153856 DOI: 10.1016/j.marpolbul.2021.112619] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 06/01/2021] [Accepted: 06/04/2021] [Indexed: 06/13/2023]
Abstract
The effects of herbicide diuron on photosynthesis and vertical migration of intertidal microphytobenthos (MPB) assemblages were investigated using chlorophyll fluorometry. The results shown diuron ≤ 60 μg L-1 had no obvious effect on MPB vertical migration during 24 h indicated by consistent rhythm. Low concentration of 10 μg L-1 diuron had no significant influence on MPB photosynthesis throughout, however, high concentrations of 40, 50, and 60 μg L-1 had significant impacts exhibited by decreased parameters of maximum relative electron transport rate (rETRmax), maximal PS II quantum yield (Fv/Fm) and non-photochemical quenching (NPQ). For middle concentrations of 20 and 30 μg L-1, above decreased 3 parameters recovered sooner or later after 2 h or 16.5 h. Comparatively, rETRmax, Fv/Fm and NPQ are concentration dependent and more sensitive than other parameters in assessing diuron toxicity. This study revealed the potential of using MPB assemblages and chlorophyll fluorometry for rapid assessing diuron toxicity in coastal sediments.
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Affiliation(s)
- Guo-Ying Du
- MOE Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, Qingdao, China.
| | - Xue-Feng Zhong
- MOE Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Christine Dupuy
- UMR7266 LIENSs-Littoral, Environnement et Sociétés, CNRS/University of La Rochelle, Institute for Coastal and Environmental Research (ILE), La Rochelle, France
| | - Shuai Che
- MOE Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Johann Lavaud
- UMR6539 LEMAR-Laboratory of Environmental Marine Sciences, CNRS/University of Brest/Ifremer/IRD, European Institute for Marine Studies (IUEM), Plouzané, France; UMR7266 LIENSs-Littoral, Environnement et Sociétés, CNRS/University of La Rochelle, Institute for Coastal and Environmental Research (ILE), La Rochelle, France.
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23
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Horseradish Essential Oil as a Promising Anti-Algal Product for Prevention of Phytoplankton Proliferation and Biofouling. PLANTS 2021; 10:plants10081550. [PMID: 34451595 PMCID: PMC8400301 DOI: 10.3390/plants10081550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 07/24/2021] [Accepted: 07/26/2021] [Indexed: 11/25/2022]
Abstract
Increased proliferation of algae is a current problem in natural and artificial water bodies. Controlling nutrients is the most sustainable treatment of increased algal proliferation, however in certain cases, it is not sufficiently available, or it does not provide results fast enough. Chemicals derived from natural sources, which could be effective in low concentrations and are biodegradable, may have an advantage over conventional chemical treatments. The main aim of the present study was to investigate the anti-cyanobacterial and anti-algal properties of allyl-isothiocyanate-containing essential oil produced from horseradish roots with a complex approach of the topic: on laboratory strains of cyanobacteria and eukaryotic algae, on microcosms containing natural phytoplankton assemblages, and on semi-natural biofilms. The results show that acute treatment can significantly reduce the viability of all the tested cyanobacteria and eukaryotic algae. Results of microcosm experiments with natural phytoplankton assemblages show that horseradish essential oil from 7.1 × 10−6% (v/v) is applicable to push back phytoplankton proliferation even in natural assemblages. The individual number in the biofilm was dropped down to one-fifth of the original individual number, so 7.1 × 10−6% (v/v) and higher concentration of the essential oil can be considered as a successful treatment against biofouling.
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Rodgers K, Mayes WM, Santoro O, Redshaw C, Mccumskay R, Parsons DR. Comparative assessment of marine weathering of ROP-derived biopolymers against conventional plastics. MARINE POLLUTION BULLETIN 2021; 167:112272. [PMID: 33774483 DOI: 10.1016/j.marpolbul.2021.112272] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 03/11/2021] [Accepted: 03/14/2021] [Indexed: 06/12/2023]
Abstract
Bio-based plastics were designed to replace single-use plastics and to cause less post-consumer environmental damage. This paper assesses the weathering of four bio-based polymers created by ring opening polymerization (ROP) promoted by a previously reported Ti-based catalyst, to detect any problems before production was scaled up. Samples were aged in seawater to identify degradation products and monitor structural changes. Surfaces evidenced degradation and a range of leaching products was observed. Aside from compounds used in the preparation of the plastics (i.e. residual monomers and benzyl alcohol), the degradation products included carboxylic acids (often found in plastic leachate), oxacyclohexadecan-2-one (potentially toxic to aquatic life) and triphenylmethane (potential carcinogen). Overall, there were fewer structural changes in the fossil fuel based polymer (PS) and in the commercially available bio-based plastic studied for comparison purposes than the lab based bio-based polymers.
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Affiliation(s)
- Karen Rodgers
- Plastics Collaboratory, Energy and Environment Institute, The University of Hull, Cottingham Road, Hull HU6 7RX, UK.
| | - William M Mayes
- Department of Geography, Geology and Environment, The University of Hull, Cottingham Road, Hull HU6 7RX, UK
| | - Orlando Santoro
- Plastics Collaboratory, Department of Chemistry, University of Hull, Cottingham Road, Hull HU6 7RX, UK
| | - Carl Redshaw
- Plastics Collaboratory, Department of Chemistry, University of Hull, Cottingham Road, Hull HU6 7RX, UK
| | - Rick Mccumskay
- Plastics Collaboratory, Energy and Environment Institute, The University of Hull, Cottingham Road, Hull HU6 7RX, UK
| | - Daniel R Parsons
- Plastics Collaboratory, Energy and Environment Institute, The University of Hull, Cottingham Road, Hull HU6 7RX, UK
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Wan Z, MacVicar BT, Wyatt S, Varela DE, Padmawar R, Hore DK. An automated image analysis platform for the study of weakly -adhered cells. BIOFOULING 2021; 37:387-396. [PMID: 34078183 DOI: 10.1080/08927014.2021.1917555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 04/06/2021] [Accepted: 04/11/2021] [Indexed: 06/12/2023]
Abstract
Details of the design and implementation of an open-source platform for studying the adhesion of cells attached to solid substrata are provided. The hardware is based on a laser-cut flow channel connected to a programmable syringe pump. The software automates all aspects of the flow rate profile, data acquisition and image analysis. An example of the pelagic diatom Thalassiosira rotula adhered to poly(dimethyl siloxane) surfaces is provided. The procedure described enables the shear rate to be converted to drag force for arbitrary-shaped objects, of utility to the study of many cell species, especially ones that are obviously non-spherical. It was determined that 90% of cells are removed with the application of drag forces < 3×10-12 N, and that this value is relatively independent of the incubation time on the surface. This result is important to understand how marine species interact with polymer surfaces that are used in electrical insulator applications.
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Affiliation(s)
- Zhijing Wan
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
| | - Ben T MacVicar
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
- Department of Mathematics & Statistics, University of Victoria, Victoria, BC, Canada
| | - Shea Wyatt
- Department of Biology, University of Victoria, Victoria, BC, Canada
| | - Diana E Varela
- Department of Biology, University of Victoria, Victoria, BC, Canada
- School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada
| | | | - Dennis K Hore
- Department of Chemistry, University of Victoria, Victoria, BC, Canada
- Department of Computer Science, University of Victoria, Victoria, BC, Canada
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Vignesh V, Nguyen THH, Vanderwal L, Stafslien S, Brennan A. Tough amphiphilic antifouling coating based on acrylamide, fluoromethacrylate and non-isocyanate urethane dimethacrylate crosslinker. BIOFOULING 2021; 37:36-48. [PMID: 33487051 DOI: 10.1080/08927014.2020.1870110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 12/21/2020] [Indexed: 06/12/2023]
Abstract
This study is focused on the development of tougher gels using combinations of acrylamide, fluoromethacrylate and a non-isocyanate urethane dimethacrylate (NIUDMA) crosslinker. The NIUDMA was tailored with 2, 3-epoxypropoxy propyl-polydimethylsiloxane segments E9 (MW = 0.36 kg mol-1), E11 (MW = 0.5-0.6 kg mol-1) and E12 (MW = 1-1.4 kg mol-1). A 3 level Taguchi design was used to evaluate the role of each component of the ternary copolymer gel on the elastic modulus and toughness. The toughness ranged from 2.5-7 MJ m-3 whereas the modulus ranged from 27-70 MPa. The formulations with the highest toughness and modulus were screened for their antifouling potential in biological assays against the microalga Navicula incerta and the bacterium Cellulophaga lytica. The E9 gels showed the best performance, achieving a 73% reduction in N. incerta cells and a 92% reduction in C. lytica biofilm remaining after water jetting treatments, when compared with the commercial Intersleek product IS700.
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Affiliation(s)
- Vishal Vignesh
- Department of Materials Science and Engineering, University of Florida, Gainesville, USA
| | - Thi Hoang Ha Nguyen
- Department of Materials Science and Engineering, University of Florida, Gainesville, USA
| | - Lyndsi Vanderwal
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, USA
| | - Shane Stafslien
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, USA
| | - Anthony Brennan
- Department of Materials Science and Engineering, University of Florida, Gainesville, USA
- Margaret A. Ross Professor of Materials Science & Engineering, Affiliate of Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA
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Kuliasha CA, Fedderwitz RL, Stafslien SJ, Finlay JA, Clare AS, Brennan AB. Anti-biofouling properties of poly(dimethyl siloxane) with RAFT photopolymerized acrylate/methacrylate surface grafts against model marine organisms. BIOFOULING 2021; 37:78-95. [PMID: 33491472 DOI: 10.1080/08927014.2021.1875216] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 01/05/2021] [Accepted: 01/07/2021] [Indexed: 06/12/2023]
Abstract
Biofouling of man-made surfaces by marine organisms is a global problem with both financial and environmental consequences. However, the development of non-toxic anti-biofouling coatings is challenged by the diversity of fouling organisms. One possible solution leverages coatings composed of diverse chemical constituents. Reversible addition-fragmentation chain-transfer (RAFT) photopolymerization was used to modify poly(dimethylsiloxane) (PDMSe) surfaces with polymeric grafts composed of three successive combinations of acrylamide, acrylic acid, and hydroxyethyl methacrylate. RAFT limited conflicting variables and allowed for the effect of graft chemistry to be isolated. While all compositions enhanced the anti-biofouling performance compared with the PDMSe control, the ternary, amphiphilic copolymer was the most effective with 98% inhibition of the attachment of zoospores of the green alga Ulva linza, 94% removal of cells of the diatom Navicula incerta, and 62% removal of cells of the bacterium Cellulophaga lytica. However, none of the graft compositions tested were able to mitigate reattachment of adult barnacles, Amphibalanus amphitrite.
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Affiliation(s)
- Cary A Kuliasha
- Department of Materials Science and Engineering, University of Florida, Gainesville, FL, USA
| | - Rebecca L Fedderwitz
- Department of Materials Science and Engineering, University of Florida, Gainesville, FL, USA
| | - Shane J Stafslien
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, ND, USA
| | - John A Finlay
- School of Natural and Environmental Sciences, Newcastle University, Newcastle-upon-Tyne, UK
| | - Anthony S Clare
- School of Natural and Environmental Sciences, Newcastle University, Newcastle-upon-Tyne, UK
| | - Anthony B Brennan
- Department of Materials Science and Engineering, University of Florida, Gainesville, FL, USA
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Pinteus S, Lemos MFL, Alves C, Silva J, Pedrosa R. The marine invasive seaweeds Asparagopsis armata and Sargassum muticum as targets for greener antifouling solutions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 750:141372. [PMID: 32853930 DOI: 10.1016/j.scitotenv.2020.141372] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 06/11/2020] [Accepted: 07/28/2020] [Indexed: 06/11/2023]
Abstract
Biofouling is a complex phenomenon that affects all maritime dependent industries. The accumulation of both micro and macro-organisms in immerged structures increases significantly the maintenance expenses, and thus the use of antifouling substances is inevitable. Although with recognized antifouling properties, the available antifouling coatings are known to induce negative impacts in aquatic ecosystems. Therefore, greener alternatives are urgently required. Living underwater, marine organisms are prone to biofouling and some have developed strategies to defend themselves against undesirable organisms, which include the production of bioactive substances. As a result, marine organisms are promising sources of natural antifouling substances. Within this framework, the marine invasive seaweeds Sargassum muticum and Asparagopsis armata were addressed for antifouling compounds biodiscovery. Both seaweeds revealed antifouling properties against microfoulers, namely algicidal and anti-biofilm activities; however Asparagopsis armata stand out for its capacity to inhibit marine bacteria and microalgae growth, to decrease biofilm formation, and for acting as a neurotransmitter disruptor through the inhibition of acetylcholinesterase activity. By addressing invasive species, the problematic of the biological material supply for industrial purposes is surpassed while mitigating the negative impacts of invasive species through specimen's collection.
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Affiliation(s)
- Susete Pinteus
- MARE - Marine and Environmental Sciences Centre, Polytechnic of Leiria, 2520-630 Peniche, Portugal..
| | - Marco F L Lemos
- MARE - Marine and Environmental Sciences Centre, Polytechnic of Leiria, 2520-630 Peniche, Portugal
| | - Celso Alves
- MARE - Marine and Environmental Sciences Centre, Polytechnic of Leiria, 2520-630 Peniche, Portugal
| | - Joana Silva
- MARE - Marine and Environmental Sciences Centre, Polytechnic of Leiria, 2520-630 Peniche, Portugal
| | - Rui Pedrosa
- MARE - Marine and Environmental Sciences Centre, Polytechnic of Leiria, 2520-630 Peniche, Portugal..
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Zecher K, Hayes KR, Philipp B. Evidence of Interdomain Ammonium Cross-Feeding From Methylamine- and Glycine Betaine-Degrading Rhodobacteraceae to Diatoms as a Widespread Interaction in the Marine Phycosphere. Front Microbiol 2020; 11:533894. [PMID: 33123096 PMCID: PMC7574528 DOI: 10.3389/fmicb.2020.533894] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 09/10/2020] [Indexed: 11/13/2022] Open
Abstract
Dissolved organic nitrogen (DON) compounds such as methylamines (MAs) and glycine betaine (GBT) occur at detectable concentrations in marine habitats and are also produced and released by microalgae. For many marine bacteria, these DON compounds can serve as carbon, energy, and nitrogen sources, but microalgae usually cannot metabolize them. Interestingly though, it was previously shown that Donghicola sp. strain KarMa—a member of the marine Rhodobacteraceae—can cross-feed ammonium such that the ammonium it produces upon degrading monomethylamine (MMA) then serves as nitrogen source for the diatom Phaeodactylum tricornutum; thus, these organisms form a mutual metabolic interaction under photoautotrophic conditions. In the present study, we investigated whether this interaction plays a broader role in bacteria–diatom interactions in general. Results showed that cross-feeding between strain KarMa and P. tricornutum was also possible with di- and trimethylamine as well as with GBT. Further, cross-feeding of strain KarMa was also observed in cocultures with the diatoms Amphora coffeaeformis and Thalassiosira pseudonana with MMA as the sole nitrogen source. Regarding cross-feeding involving other Rhodobacteraceae strains, the in silico analysis of MA and GBT degradation pathways indicated that algae-associated Rhodobacteraceae-type strains likely interact with P. tricornutum in a similar manner as the strain KarMa does. For these types of strains (such as Celeribacter halophilus, Roseobacter denitrificans, Roseovarius indicus, Ruegeria pomeroyi, and Sulfitobacter noctilucicola), ammonium cross-feeding after methylamine degradation showed species-specific patterns, whereas bacterial GBT degradation always led to diatom growth. Overall, the degradation of DON compounds by the Rhodobacteraceae family and the subsequent cross-feeding of ammonium may represent a widespread, organism-specific, and regulated metabolic interaction for establishing and stabilizing associations with photoautotrophic diatoms in the oceans.
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Affiliation(s)
- Karsten Zecher
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Münster, Germany
| | - Kristiane Rebecca Hayes
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Münster, Germany
| | - Bodo Philipp
- Institute for Molecular Microbiology and Biotechnology, University of Münster, Münster, Germany
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Antunes JT, Sousa AGG, Azevedo J, Rego A, Leão PN, Vasconcelos V. Distinct Temporal Succession of Bacterial Communities in Early Marine Biofilms in a Portuguese Atlantic Port. Front Microbiol 2020; 11:1938. [PMID: 32849482 PMCID: PMC7432428 DOI: 10.3389/fmicb.2020.01938] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 07/22/2020] [Indexed: 12/13/2022] Open
Abstract
Marine biofilms are known to influence the corrosion of metal surfaces in the marine environment. Despite some recent research, the succession of bacterial communities colonizing artificial surfaces remains uncharacterized in some temporal settings. More specifically, it is not fully known if bacterial colonizers of artificial surfaces are similar or distinct in the different seasons of the year. In particular the study of early biofilms, in which the bacterial cells communities first adhere to artificial surfaces, are crucial for the development of the subsequent biofilm communities. In this work, we used amplicon-based NGS (next-generation sequencing) and universal 16S rRNA bacterial primers to characterize the early biofilm bacterial communities growing on 316 L stainless steel surfaces in a Northern Portugal port. Sampling spanned 30-day periods in two distinct seasons (spring and winter). Biofilm communities growing in steel surfaces covered with an anti-corrosion paint and planktonic communities from the same location were also characterized. Our results demonstrated that distinct temporal patterns were observed in the sampled seasons. Specifically, a significantly higher abundance of Gammaproteobacteria and Mollicutes was found on the first days of biofilm growth in spring (day 1 to day 4) and a higher abundance of Alphaproteobacteria during the same days of biofilm growth in winter. In the last sampled day (day 30), the spring biofilms significantly shifted toward a dominance of photoautotrophic groups (mostly diatoms) and were also colonized by some macrofouling communities, something not observed during the winter sampling. Our results revealed that bacterial composition in the biofilms was particularly affected by the sampled day of the specific season, more so than the overall effect of the season or overall sampling day of both seasons. Additionally, the application of a non-fouling-release anti-corrosion paint in the steel plates resulted in a significantly lower diversity compared with plates without paint, but this was only observed during spring. We suggest that temporal succession of marine biofilm communities should be taken in consideration for future antifouling/anti-biofilm applications.
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Affiliation(s)
- Jorge T. Antunes
- Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Matosinhos, Portugal
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
| | - António G. G. Sousa
- Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Matosinhos, Portugal
| | - Joana Azevedo
- Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Matosinhos, Portugal
| | - Adriana Rego
- Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Matosinhos, Portugal
- Institute of Biomedical Sciences Abel Salazar, University of Porto, Porto, Portugal
| | - Pedro N. Leão
- Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Matosinhos, Portugal
| | - Vitor Vasconcelos
- Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Matosinhos, Portugal
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
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Kaleli A, Car A, Witkowski A, Krzywda M, Riaux-Gobin C, Solak CN, Kaska Y, Zgłobicka I, Płociński T, Wróbel R, Kurzydłowski K. Biodiversity of carapace epibiont diatoms in loggerhead sea turtles ( Caretta caretta Linnaeus 1758) in the Aegean Sea Turkish coast. PeerJ 2020; 8:e9406. [PMID: 32742770 PMCID: PMC7370927 DOI: 10.7717/peerj.9406] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Accepted: 06/02/2020] [Indexed: 11/23/2022] Open
Abstract
Background The Aegean Sea coast of Turkey hosts one of the most important nesting grounds for loggerhead sea turtles (Caretta caretta) in the Mediterranean Sea. Previous studies have revealed that the sea turtle carapace provides favourable conditions for various epibiontic organisms. Epibionts occurring on the carapace have been examined from different locations in the oceans. Methods This is the first time such a high number (39) of samples collected from nesting turtles during such a long time period (extending from 2011 to 2018) has been used for the study of the diatom component of the microbiome on the turtle carapaces. A total of 33 samples were investigated in terms of light microscopy (LM) and scanning electron microscopy (SEM). Six unprocessed biofilm fragments were subject to SEM observations. Results A total of 457 epizoic diatom taxa belonging to 86 genera were identified. Epizoic forms, e.g., Achnanthes spp., Chelonicola spp. or Tripterion spp. (also identified by SEM observations of the undisturbed pieces of the microbiome) dominated in terms of relative abundance, but the highest numbers of taxa were ubiquitously represented by Navicula (79), Nitzschia (45), Amphora (40), Cocconeis (32), Diploneis (25) and Mastogloia (23). Navicula perminuta and Delphineis australis were the most frequent taxa, present in 65% of the samples, both with an average relative abundance of 10%. The results of our study revealed that diatoms are an essential component of the loggerhead sea turtles’ microbiome, in terms of high biodiversity and abundance. Although strict epibionts provide a signature of the turtle microbiome, the carapace as a solid substrate attracts numerous benthic diatom species which are considered opportunistic forms and can be found in the surrounding benthic habitats of the vast ocean littoral space.
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Affiliation(s)
- Aydın Kaleli
- Department of Marine and Freshwater Resources Management, Faculty of Aquatic Sciences, Istanbul University, Istanbul, Turkey
| | - Ana Car
- Institute for Marine and Coastal Research, University of Dubrovnik, Dubrovnik, Croatia
| | - Andrzej Witkowski
- Institute of Marine and Environmental Sciences, University of Szczecin, Szczecin, Poland
| | - Marta Krzywda
- Institute of Marine and Environmental Sciences, University of Szczecin, Szczecin, Poland
| | - Catherine Riaux-Gobin
- CNRS-EPHE-UPVD, CRIOBE, PSL Research University, Perpignan, France.,Laboratoire d'Excellence 'CORAIL', Université de Perpignan, Perpignan, France
| | - Cüneyt Nadir Solak
- Department of Biology, Faculty of Science and Arts, Kütahya Dumlupınar University, Kütahya, Turkey
| | - Yakup Kaska
- Department of Biology, Faculty of Science and Arts, Pamukkale University, Denizli, Turkey
| | - Izabela Zgłobicka
- Faculty of Mechanical Engineering, Bialystok University of Technology, Bialystok, Poland
| | - Tomasz Płociński
- Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
| | - Rafał Wróbel
- Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Poland
| | - Krzysztof Kurzydłowski
- Faculty of Mechanical Engineering, Bialystok University of Technology, Bialystok, Poland.,Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland
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Lee H, Depuydt S, Choi S, Han T, Park J. Rapid toxicity assessment of six antifouling booster biocides using a microplate-based chlorophyll fluorescence in Undaria pinnatifida gametophytes. ECOTOXICOLOGY (LONDON, ENGLAND) 2020; 29:559-570. [PMID: 32333251 DOI: 10.1007/s10646-020-02207-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/30/2020] [Indexed: 06/11/2023]
Abstract
Biocides of antifouling agents can cause problems in marine ecosystems by damaging to non-target algal species. Aquatic bioassays are important means of assessing the quality of water containing mixtures of contaminants and of providing a safety standard for water management in an ecological context. In this study, a rapid, sensitive and inexpensive test method was developed using free-living male and female gametophytes of the brown macroalga Undaria pinnatifida. A conventional fluorometer was employed to evaluate the acute (48 h) toxic effects of six antifouling biocides: 4,5-Dichloro-2-octyl-isothiazolone (DCOIT), diuron, irgarol, medetomidine, tolylfluanid, zinc pyrithione (ZnPT). The decreasing toxicity in male and female gametophytes as estimated by EC50 (effective concentration at which 50% inhibition occurs) values was: diuron (0.037 and 0.128 mg l-1, respectively) > irgarol (0.096 and 0.172 mg l-1, respectively) > tolylfluanid (0.238 and 1.028 mg l-1, respectively) > DCOIT (1.015 and 0.890 mg l-1, respectively) > medetomidine (12.032 and 12.763 mg l-1, respectively). For ZnPT, 50% fluorescence inhibition of U. pinnatifida gametophytes occurred at concentrations above 0.4 mg l-1. The Undaria method is rapid, simple, practical, and cost-effective for the detection of photosynthesis-inhibiting biocides, thus making a useful tool for testing the toxicity of antifouling agents in marine environments.
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Affiliation(s)
- Hojun Lee
- Department of Marine Science, Incheon National University, 119, Academy-ro, Yeonsu-gu, Incheon, 22012, Republic of Korea
- Ghent University Global Campus, 119-5, Songdomunhwa-ro, Yeonsu-gu, Incheon, 21985, Republic of Korea
| | - Stephen Depuydt
- Ghent University Global Campus, 119-5, Songdomunhwa-ro, Yeonsu-gu, Incheon, 21985, Republic of Korea
| | - Soyeon Choi
- Department of Marine Science, Incheon National University, 119, Academy-ro, Yeonsu-gu, Incheon, 22012, Republic of Korea
| | - Taejun Han
- Department of Marine Science, Incheon National University, 119, Academy-ro, Yeonsu-gu, Incheon, 22012, Republic of Korea
- Ghent University Global Campus, 119-5, Songdomunhwa-ro, Yeonsu-gu, Incheon, 21985, Republic of Korea
| | - Jihae Park
- Ghent University Global Campus, 119-5, Songdomunhwa-ro, Yeonsu-gu, Incheon, 21985, Republic of Korea.
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Haider W, Ma J, Hou XM, Wei MY, Zheng JY, Shao CL. Natural Flavones and their Preliminary Structure–Antifouling Activity Relationship. Chem Nat Compd 2020. [DOI: 10.1007/s10600-020-03023-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Wang X, Yu L, Liu Y, Jiang X. Synthesis and fouling resistance of capsaicin derivatives containing amide groups. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 710:136361. [PMID: 31926417 DOI: 10.1016/j.scitotenv.2019.136361] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 12/17/2019] [Accepted: 12/25/2019] [Indexed: 06/10/2023]
Abstract
Capsaicin, which inhibits the attachment and growth of fouling organisms, is a bioactive substance that is generally recognized as a highly active environmental algaecide agent. Its derivatives are simple in structure and have been proven to have low toxicity and be environmentally friendly. Six capsaicin derivatives were synthesized via Friedel-Crafts alkylation and characterized using melting point (MP) analysis, infrared (IR) spectroscopy, nuclear magnetic resonance (1H NMR) spectroscopy and high-resolution mass spectrometry (HRMS). The inhibition effect and toxicity of these compounds towards Phaeodactylum tricornutum (P. tricornutum), Skeletonema costatum (S. costatum) and Chaetoceros curvisetus (C. curvisetus) were tested. The capsaicin derivatives all showed inhibitory effects. In particular, compound E with over 95% (3 mg·L-1) inhibition and intermediate toxicity was superior to the other compounds, reflecting an environmentally friendly effect. This finding indicates that capsaicin derivatives possess the potential to become environmentally friendly algaecide agents. The fouling resistance of capsaicin derivatives incorporated into the coatings as antifouling agents was measured in the marine environment. The results showed that capsaicin derivatives possess excellent fouling resistance, with only a small amount of algae and muck attached to the tested panel at 90 days. The above results provide a scientific basis for the application of capsaicin derivatives as environmentally friendly antifouling agents.
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Affiliation(s)
- Xuan Wang
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
| | - Liangmin Yu
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology, Qingdao 266100, China
| | - Yujing Liu
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
| | - Xiaohui Jiang
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology, Qingdao 266100, China.
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The Interaction of Biofoulants and Calcareous Deposits on Corrosion Performance of Q235 in Seawater. MATERIALS 2020; 13:ma13040850. [PMID: 32069945 PMCID: PMC7078610 DOI: 10.3390/ma13040850] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Revised: 01/03/2020] [Accepted: 02/07/2020] [Indexed: 11/18/2022]
Abstract
An understanding of the interaction of calcareous deposits and biofoulants on the corrosion performance of steel during the fouling stage is both interesting and necessary. So, the effects of these factors on Q235 carbon steel were investigated and discussed for 20 weeks under real ocean conditions. The results indicate that calcareous deposits are favorable for the attachment of marine microorganisms. However, macroorganisms prefer adhering directly to the substrate. The generations of calcareous deposits have priority over the biofilm attachment under the condition of cathodic protection. Calcareous deposits can prevent steel against corrosion for four weeks without cathodic protection.
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Laviale M, Beaussart A, Allen J, Quilès F, El-Kirat-Chatel S. Probing the Adhesion of the Common Freshwater Diatom Nitzschia palea at Nanoscale. ACS APPLIED MATERIALS & INTERFACES 2019; 11:48574-48582. [PMID: 31766843 DOI: 10.1021/acsami.9b17821] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Freshwater biofilms play an essential ecological role, but they also adversely affect human activities through undesirable biofouling of artificial submerged structures. They form complex aggregates of microorganisms that colonize any type of substratum. In phototrophic biofilms, diatoms dominate in biomass and produce copious amount of extracellular polymeric substances (EPSs), making them efficient early colonizers. Therefore, a better understanding of diatoms adhesive properties is essential to develop new anti-biofouling strategies. In this context, we used atomic force microscopy (AFM) to decipher the topography and adhesive mechanisms of the common freshwater diatom Nitzschia palea. Images taken in physiological conditions revealed typical ultrastructural features with a few nanometers resolution. Using single-cell force spectroscopy, we showed that N. palea strongly adheres to hydrophobic surfaces as compared to hydrophilic ones. Chemical force spectroscopy with hydrophobic tips further confirmed that the adhesion is governed by surface-associated hydrophobic EPS distributed in clusters at the frustule surface, and mostly composed of (glyco)-lipids as revealed by Raman spectroscopy. Collectively, our results demonstrate that AFM-based nanoscopy, combined with Raman spectroscopy, is a powerful tool to provide new insights into the adhesion mechanisms of diatoms.
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Affiliation(s)
- Martin Laviale
- Université de Lorraine, CNRS, LIEC , F-57000 Metz , France
| | | | - Joey Allen
- Université de Lorraine, CNRS, LIEC , F-57000 Metz , France
| | - Fabienne Quilès
- Université de Lorraine, CNRS, LCPME , F-54000 Nancy , France
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Dai G, Xie Q, Ai X, Ma C, Zhang G. Self-Generating and Self-Renewing Zwitterionic Polymer Surfaces for Marine Anti-Biofouling. ACS APPLIED MATERIALS & INTERFACES 2019; 11:41750-41757. [PMID: 31603306 DOI: 10.1021/acsami.9b16775] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Regeneration of antifouling polymer surfaces after contamination or damage is an important issue, especially in complex marine environments. Here, inspired by the self-renewal of silyl acrylate polymers and the protein resistance of zwitterionic polymers, we prepared a novel hydrolysis-induced zwitterionic monomer, tertiary carboxybetaine triisopropylsilyl ester ethyl acrylate (TCBSA), and copolymerized it with methyl methacrylate (MMA). Such a copolymer rapidly self-generates a zwitterionic surface and provides fouling resistance in marine environments. Furthermore, TCBSA was copolymerized with MMA and 2-methylene-1,3-dioxepane (MDO), where MDO causes degradation of the polymers. Our study demonstrates that the degradation of the polymer is controlled, and the degradation rate increases with the external enzyme concentration in the seawater, leading to a self-renewing dynamic surface. Quartz crystal microbalance with dissipation measurements show that the polymeric coating with self-generating zwitterions has excellent protein resistance in seawater. Bioassays demonstrate that the coating can effectively inhibit the adhesion of marine bacteria (Pseudomonas sp.) and diatoms (Navicula incerta). The coating with a self-generating and self-renewing zwitterionic surface is potential to find applications in marine anti-biofouling.
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Affiliation(s)
- Guoxiong Dai
- Faculty of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , P. R. China
| | - Qingyi Xie
- Faculty of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , P. R. China
| | - Xiaoqing Ai
- Faculty of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , P. R. China
| | - Chunfeng Ma
- Faculty of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , P. R. China
| | - Guangzhao Zhang
- Faculty of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , P. R. China
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Eslami B, Irajizad P, Jafari P, Nazari M, Masoudi A, Kashyap V, Stafslien S, Ghasemi H. Stress-localized durable anti-biofouling surfaces. SOFT MATTER 2019; 15:6014-6026. [PMID: 31309202 DOI: 10.1039/c9sm00790c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Growing demands for bio-friendly antifouling surfaces have stimulated the development of new and ever-improving material paradigms. Despite notable progress in bio-friendly coatings, the biofouling problem remains a critical challenge. In addition to biofouling characteristics, mechanically stressed surfaces such as ship hulls, piping systems, and heat exchangers require long-term durability in marine environments. Here, we introduce a new generation of anti-biofouling coatings with superior characteristics and high mechanical, chemical and environmental durability. In these surfaces, we have implemented the new physics of stress localization to minimize the adhesion of bio-species on the coatings. This polymeric material contains dispersed organogels in a high shear modulus matrix. Interfacial cavitation induced at the interface of bio-species and organogel particles leads to stress localization and detachment of bio-species from these surfaces with minimal shear stress. In a comprehensive study, the performance of these surfaces is assessed for both soft and hard biofouling including Ulva, bacteria, diatoms, barnacles and mussels, and is compared with that of state-of-the-art surfaces. These surfaces show Ulva accumulation of less than 1%, minimal bacterial biofilm growth, diatom attachment of 2%, barnacle adhesion of 0.02 MPa and mussel adhesion of 7.5 N. These surfaces promise a new physics-based route to address the biofouling problem and avoid adverse effects of biofouling on the environment and relevant technologies.
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Affiliation(s)
- Bahareh Eslami
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Rd, Houston, Texas 77204-4006, USA.
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Antunes J, Leão P, Vasconcelos V. Marine biofilms: diversity of communities and of chemical cues. ENVIRONMENTAL MICROBIOLOGY REPORTS 2019; 11:287-305. [PMID: 30246474 DOI: 10.1111/1758-2229.12694] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 09/14/2018] [Indexed: 06/08/2023]
Abstract
Surfaces immersed in seawater are rapidly colonized by various microorganisms, resulting in the formation of heterogenic marine biofilms. These communities are known to influence the settlement of algae spores and invertebrate larvae, triggering a succession of fouling events, with significant environmental and economic impacts. This review covers recent research regarding the differences in composition of biofilms isolated from different artificial surface types and the influence of environmental factors on their formation. One particular phenomenon - bacterial quorum sensing (QS) - allows bacteria to coordinate swarming, biofilm formation among other phenomena. Some other marine biofilm chemical cues are believed to modulate the settlement and the succession of macrofouling organisms, and they are also reviewed here. Finally, since the formation of a marine biofilm is considered to be an initial, QS-dependent step in the development of marine fouling events, QS inhibition is discussed on its potential as a tool for antibiofouling control in marine settings.
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Affiliation(s)
- Jorge Antunes
- CIIMAR/CIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Av. General Norton de Matos, s/n 4450-208, Matosinhos, Portugal
- Department of Biology, Faculty of Sciences, University of Porto, Rua do Campo Alegre 4069-007, Porto, Portugal
| | - Pedro Leão
- CIIMAR/CIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Av. General Norton de Matos, s/n 4450-208, Matosinhos, Portugal
- Department of Biology, Faculty of Sciences, University of Porto, Rua do Campo Alegre 4069-007, Porto, Portugal
| | - Vitor Vasconcelos
- CIIMAR/CIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Av. General Norton de Matos, s/n 4450-208, Matosinhos, Portugal
- Department of Biology, Faculty of Sciences, University of Porto, Rua do Campo Alegre 4069-007, Porto, Portugal
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Contribution of frustules and mucilage trails to the mobility of diatom Navicula sp. Sci Rep 2019; 9:7342. [PMID: 31089153 PMCID: PMC6517400 DOI: 10.1038/s41598-019-43663-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 04/23/2019] [Indexed: 11/28/2022] Open
Abstract
The secreted mucilage trails of the diatom Navicula sp. in the process of motility were studied by scanning electron microscopy (SEM), transmission electron microscope (TEM), atomic force microscopy (AFM) and Raman spectra etc. Contrary to previous studies, force measurement was taken directly on the mucilage trails of live cells using the method of in situ force mapping by AFM. The retraction force curve presented an increased tip-substrate peak and a small saw-tooth pattern tip-mucilage peak. Especially, same measurements on various substrates with different surface energy revealed that the mucilage trails actually functioned as a medium increasing the adhesive force between the diatom and substrates, which is crucial to diatom’s adhesion and locomotion. In addition, the mechanical properties of mucilage trails were quite different from mucilage strands in the maximum adhesive force and the maximum polymer extension length. Raman spectra indicated the difference in compositions that both of the two kinds of mucilages had proteins and polysaccharide, but the mucilage strands contained some other components with C=O, —CH2— and —CH3 asymmetric and symmetric stretches. This research hammers out more precise information about mucilage trails which would be useful in terms of diatom motility and biofouling prevention.
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Loftus SE, Johnson ZI. Reused Cultivation Water Accumulates Dissolved Organic Carbon and Uniquely Influences Different Marine Microalgae. Front Bioeng Biotechnol 2019; 7:101. [PMID: 31157215 PMCID: PMC6528441 DOI: 10.3389/fbioe.2019.00101] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 04/23/2019] [Indexed: 11/26/2022] Open
Abstract
Reusing growth medium (water supplemented with nutrients) for microalgae cultivation is required for economical and environmentally sustainable production of algae bioproducts (fuels, feed, and food). However, reused medium often contains microbes and dissolved organic matter that may affect algae growth. While the accumulation of dissolved organic carbon (DOC) in reused medium has been demonstrated, it is unclear whether DOC concentrations affect algae growth or subsequent rates of algal DOC release. To address these questions, lab-scale experiments were conducted with three marine microalgae strains, Navicula sp. SFP, Staurosira sp. C323, and Chlorella sp. D046, grown in medium reused up to four times. Navicula sp. and Chlorella sp. grew similarly in reused medium as in fresh medium, while Staurosira sp. became completely inhibited in reused medium. Across the three algae, there was no broad trend between initial DOC concentration in reused medium and algae growth response. Navicula sp. released less DOC overall in reused medium than in fresh medium, but DOC release rates did not decrease proportionally with increased DOC concentrations. Net DOC accumulation was much lower than gross DOC released by Navicula sp. and Staurosira sp., indicating the majority of released DOC was degraded. Additionally, biodegradation experiments with reused media showed no further net decrease in DOC, suggesting the accumulated DOC was recalcitrant to the associated bacteria. Overall, these results suggest that taxa-specific factors may be responsible for algae growth response in reused medium, and that DOC release and accumulation are insensitive to prior cultivation rounds. Choosing an algae strain that is uninhibited by accumulated DOC is therefore critical to ensure successful water reuse in the algae industry.
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Affiliation(s)
- Sarah E. Loftus
- Duke University Marine Lab, Nicholas School of the Environment, Beaufort, NC, United States
| | - Zackary I. Johnson
- Duke University Marine Lab, Nicholas School of the Environment, Beaufort, NC, United States
- Department of Biology, Trinity College of Arts and Sciences, Duke University, Durham, NC, United States
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Abed RMM, Al Fahdi D, Muthukrishnan T. Short-term succession of marine microbial fouling communities and the identification of primary and secondary colonizers. BIOFOULING 2019; 35:526-540. [PMID: 31216872 DOI: 10.1080/08927014.2019.1622004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 05/16/2019] [Accepted: 05/17/2019] [Indexed: 06/09/2023]
Abstract
Microbial succession during the initial stages of marine biofouling has been rarely studied, especially in the Arabian Gulf. This study was undertaken to follow temporal shifts in biofouling communities in order to identify primary and secondary colonizers. Quantitative analysis revealed a significant increase in total biomass, coverage of macrofoulers, chlorophyll a concentrations, and bacterial counts with time. The relative abundance of the adnate diatoms increased with time, whereas it decreased in the case of the plocon diatoms. Non-metric multidimensional scaling (NMDS) ordination based on MiSeq data placed the bacterial communities in three distinct clusters, depending on the time of sampling. While the relative abundance of Alphaproteobacteria and Flavobacteriia decreased with time, suggesting their role as primary colonizers, the relative abundance of Actinobacteria and Planctomycetia increased with time, suggesting their role as secondary colonizers. Biofouling is a dynamic process that involves temporal quantitative and qualitative shifts in the micro- and macrofouling communities.
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Affiliation(s)
- Raeid M M Abed
- Biology Department, College of Science, Sultan Qaboos University , Al Khoud , Sultanate of Oman
| | - Dhikra Al Fahdi
- Biology Department, College of Science, Sultan Qaboos University , Al Khoud , Sultanate of Oman
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Liang X, Peng LH, Zhang S, Zhou S, Yoshida A, Osatomi K, Bellou N, Guo XP, Dobretsov S, Yang JL. Polyurethane, epoxy resin and polydimethylsiloxane altered biofilm formation and mussel settlement. CHEMOSPHERE 2019; 218:599-608. [PMID: 30502698 DOI: 10.1016/j.chemosphere.2018.11.120] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 11/17/2018] [Accepted: 11/19/2018] [Indexed: 06/09/2023]
Abstract
In many environments, biofilms are a major mode and an emergent form of microbial life. Biofilms play crucial roles in biogeochemical cycling and invertebrate recruitment in marine environments. However, relatively little is known about how marine biofilms form on different substrata and about how these biofilms impact invertebrate recruitment. Here, we performed a comparative analysis of a 28-day-old biofilm community on non-coated (a control glass) and coated substrata (polyurethane (PU), epoxy resin (EP) and polydimethylsiloxane (PDMS)) and examined the settlement of Mytilus coruscus plantigrades on these biofilms. PU, EP and PDMS deterred the development of marine biofilms by reducing the biofilm biomass including the biofilm dry weight, cell density of the bacteria and diatoms and chlorophyll a concentrations. Further analysis of bacterial community revealed that EP altered the bacterial community composition compared with that on the glass substrata by reducing the relative abundance of Ruegeria (Alphaproteobacteria) and by increasing the relative abundance of Methylotenera (Betaproteobacteria) and Cyanobacteria in the biofilms. However, bacterial communities developed on PU and PDMS, as well as glass and PU, EP and PDMS did not exhibit differences from each other. The M. coruscus settlement rates on biofilms on PU, EP and PDMS were reduced by 20-41% compared with those on the glass after 28 days. Thus, the tested coatings impacted the development of marine biofilms by altering the biofilm biomass and/or the bacterial community composition. The mussel settlements decreased in the biofilms that formed on the coatings compared with those on non-coated glass.
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Affiliation(s)
- Xiao Liang
- International Research Center for Marine Biosciences, Ministry of Science and Technology, Shanghai Ocean University, Shanghai, China; Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai, China; National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai, China
| | - Li-Hua Peng
- International Research Center for Marine Biosciences, Ministry of Science and Technology, Shanghai Ocean University, Shanghai, China; Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai, China
| | - Shuo Zhang
- International Research Center for Marine Biosciences, Ministry of Science and Technology, Shanghai Ocean University, Shanghai, China
| | - Shuxue Zhou
- Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Advanced Coatings Research Center of Ministry of Education of China, Fudan University, Shanghai, China
| | - Asami Yoshida
- Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki, Japan
| | - Kiyoshi Osatomi
- Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki, Japan
| | - Nikoleta Bellou
- Hellenic Centre for Marine Research, Institute of Oceanography, Athens, Greece
| | - Xing-Pan Guo
- International Research Center for Marine Biosciences, Ministry of Science and Technology, Shanghai Ocean University, Shanghai, China; Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai, China.
| | - Sergey Dobretsov
- Department of Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Oman; Center of Excellence in Marine Biotechnology, Sultan Qaboos University, Muscat, Oman.
| | - Jin-Long Yang
- International Research Center for Marine Biosciences, Ministry of Science and Technology, Shanghai Ocean University, Shanghai, China; Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai, China; National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai, China.
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Antunes J, Pereira S, Ribeiro T, Plowman JE, Thomas A, Clerens S, Campos A, Vasconcelos V, Almeida JR. A Multi-Bioassay Integrated Approach to Assess the Antifouling Potential of the Cyanobacterial Metabolites Portoamides. Mar Drugs 2019; 17:E111. [PMID: 30759807 PMCID: PMC6410096 DOI: 10.3390/md17020111] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 01/31/2019] [Accepted: 02/08/2019] [Indexed: 02/06/2023] Open
Abstract
The cyclic peptides portoamides produced by the cyanobacterium Phormidium sp. LEGE 05292 were previously isolated and their ability to condition microcommunities by allelopathic effect was described. These interesting bioactive properties are, however, still underexplored as their biotechnological applications may be vast. This study aims to investigate the antifouling potential of portoamides, given that a challenge in the search for new environmentally friendly antifouling products is to find non-toxic natural alternatives with the ability to prevent colonization of different biofouling species, from bacteria to macroinvertebrates. A multi-bioassay approach was applied to assess portoamides antifouling properties, marine ecotoxicity and molecular mode of action. Results showed high effectiveness in the prevention of mussel larvae settlement (EC50 = 3.16 µM), and also bioactivity towards growth and biofilm disruption of marine biofouling bacterial strains, while not showing toxicity towards both target and non-target species. Antifouling molecular targets in mussel larvae include energy metabolism modifications (failure in proton-transporting ATPases activity), structural alterations of the gills and protein and gene regulatory mechanisms. Overall, portoamides reveal a broad-spectrum bioactivity towards diverse biofouling species, including a non-toxic and reversible effect towards mussel larvae, showing potential to be incorporated as an active ingredient in antifouling coatings.
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Affiliation(s)
- Jorge Antunes
- Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto, Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4450-208 Matosinhos, Portugal.
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, P 4069-007 Porto, Portugal.
| | - Sandra Pereira
- Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto, Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4450-208 Matosinhos, Portugal.
| | - Tiago Ribeiro
- Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto, Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4450-208 Matosinhos, Portugal.
| | | | - Ancy Thomas
- AgResearch Ltd., 1365 Springs Rd, Lincoln 7674, New Zealand.
| | - Stefan Clerens
- AgResearch Ltd., 1365 Springs Rd, Lincoln 7674, New Zealand.
- Biomolecular Interaction Centre, University of Canterbury, Christchurch P 8140, New Zealand.
- Riddet Institute, Massey University, Palmerston North P 4442, New Zealand.
| | - Alexandre Campos
- Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto, Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4450-208 Matosinhos, Portugal.
| | - Vitor Vasconcelos
- Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto, Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4450-208 Matosinhos, Portugal.
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, P 4069-007 Porto, Portugal.
| | - Joana R Almeida
- Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Universidade do Porto, Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4450-208 Matosinhos, Portugal.
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45
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Su X, Hao D, Li Z, Guo X, Jiang L. Design of hierarchical comb hydrophilic polymer brush (HCHPB) surfaces inspired by fish mucus for anti-biofouling. J Mater Chem B 2019; 7:1322-1332. [DOI: 10.1039/c8tb03278e] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Rationally designing anti-biofouling surfaces using grafted hierarchical comb hydrophilic polymer brushes (HCHPBs).
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Affiliation(s)
- Xin Su
- College of Environmental and Chemical Engineering
- Dalian University
- Dalian 116622
- China
- Beijing National Laboratory for Molecular Sciences (BNLMS)
| | - Dezhao Hao
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
- School of Future Technology
| | - Zhengning Li
- College of Environmental and Chemical Engineering
- Dalian University
- Dalian 116622
- China
| | - Xinglin Guo
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- Key Laboratory of Green Printing
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Lei Jiang
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
- School of Future Technology
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46
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Bondoc KGV, Lembke C, Lang SN, Germerodt S, Schuster S, Vyverman W, Pohnert G. Decision-making of the benthic diatom Seminavis robusta searching for inorganic nutrients and pheromones. ISME JOURNAL 2018; 13:537-546. [PMID: 30301945 PMCID: PMC6331598 DOI: 10.1038/s41396-018-0299-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 09/12/2018] [Accepted: 09/14/2018] [Indexed: 11/28/2022]
Abstract
Microorganisms encounter a diversity of chemical stimuli that trigger individual responses and influence population dynamics. However, microbial behavior under the influence of different incentives and microbial decision-making is poorly understood. Benthic marine diatoms that react to sexual attractants as well as to nutrient gradients face such multiple constraints. Here, we document and model behavioral complexity and context-sensitive responses of these motile unicellular algae to sex pheromones and the nutrient silicate. Throughout the life cycle of the model diatom Seminavis robusta nutrient-starved cells localize sources of silicate by combined chemokinetic and chemotactic motility. However, with an increasing need for sex to restore the initial cell size, a change in behavior favoring the attraction-pheromone-guided search for a mating partner takes place. When sex becomes inevitable to prevent cell death, safeguard mechanisms are abandoned, and cells prioritize the search for mating partners. Such selection processes help to explain biofilm organization and to understand species interactions in complex communities.
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Affiliation(s)
- Karen Grace V Bondoc
- Institute for Inorganic and Analytical Chemistry, Bioorganic Analytics, Friedrich-Schiller-Universität Jena, Lessingstrasse 8, D-07743, Jena, Germany. .,Max Planck Institute for Chemical Ecology, Hans-Knöll-Str. 8, D-07745, Jena, Germany. .,Department of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, 08901-8521, USA.
| | - Christine Lembke
- Institute for Inorganic and Analytical Chemistry, Bioorganic Analytics, Friedrich-Schiller-Universität Jena, Lessingstrasse 8, D-07743, Jena, Germany.,Department of Experimental Limnology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhütte 2, D-16775, Stechlin, Germany
| | - Stefan N Lang
- Department of Bioinformatics, Friedrich-Schiller-Universität Jena, Ernst-Abbe-Platz 2, D-07743, Jena, Germany
| | - Sebastian Germerodt
- Department of Bioinformatics, Friedrich-Schiller-Universität Jena, Ernst-Abbe-Platz 2, D-07743, Jena, Germany
| | - Stefan Schuster
- Department of Bioinformatics, Friedrich-Schiller-Universität Jena, Ernst-Abbe-Platz 2, D-07743, Jena, Germany
| | - Wim Vyverman
- Laboratory of Protistology and Aquatic Ecology, Department of Biology, University Gent, Krijgslaan 281 S8, 9000, Gent, Belgium
| | - Georg Pohnert
- Institute for Inorganic and Analytical Chemistry, Bioorganic Analytics, Friedrich-Schiller-Universität Jena, Lessingstrasse 8, D-07743, Jena, Germany. .,Max Planck Institute for Chemical Ecology, Hans-Knöll-Str. 8, D-07745, Jena, Germany.
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47
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Murphy EAK, Barros JM, Schultz MP, Flack KA, Steppe CN, Reidenbach MA. Roughness effects of diatomaceous slime fouling on turbulent boundary layer hydrodynamics. BIOFOULING 2018; 34:976-988. [PMID: 30602310 DOI: 10.1080/08927014.2018.1517867] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 08/23/2018] [Accepted: 08/25/2018] [Indexed: 06/09/2023]
Abstract
Biofilm fouling significantly impacts ship performance. Here, the impact of biofilm on boundary layer structure at a ship-relevant, low Reynolds number was investigated. Boundary layer measurements were performed over slime-fouled plates using high resolution particle image velocimetry (PIV). The velocity profile over the biofilm showed a downward shift in the log-law region (ΔU+), resulting in an effective roughness height (ks) of 8.8 mm, significantly larger than the physical thickness of the biofilm (1.7 ± 0.5 mm) and generating more than three times as much frictional drag as the smooth-wall. The skin-friction coefficient, Cf, of the biofilm was 9.0 × 10-3 compared with 2.9 × 10-3 for the smooth wall. The biofilm also enhances turbulent kinetic energy (tke) and Reynolds shear stress, which are more heterogeneous in the streamwise direction than smooth-wall flows. This suggests that biofilms increase drag due to high levels of momentum transport, likely resulting from protruding streamers and surface compliance.
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Affiliation(s)
- Elizabeth A K Murphy
- a Department of Environmental Sciences , University of Virginia , Charlottesville , VA , USA
| | - Julio M Barros
- b Department of Mechanical Engineering , United States Naval Academy , Annapolis , MD , USA
| | - Michael P Schultz
- c Department of Naval Architecture and Ocean Engineering , United States Naval Academy , Annapolis , MD , USA
| | - Karen A Flack
- d Department of Mechanical Engineering , United States Naval Academy , Annapolis , MD , USA
| | - Cecily N Steppe
- e Department of Oceanography , United States Naval Academy , Annapolis , MD , USA
| | - Matthew A Reidenbach
- f Department of Environmental Sciences , University of Virginia , Charlottesville , VA , USA
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Jeong Y, Thuy LT, Ki SH, Ko S, Kim S, Cho WK, Choi JS, Kang SM. Multipurpose Antifouling Coating of Solid Surfaces with the Marine-Derived Polymer Fucoidan. Macromol Biosci 2018; 18:e1800137. [DOI: 10.1002/mabi.201800137] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 07/04/2018] [Indexed: 12/31/2022]
Affiliation(s)
- Yeonwoo Jeong
- Department of Chemistry; Chungbuk National University; Chungbuk 28644 Republic of Korea
| | - Le Thi Thuy
- Department of Biochemistry; Chungnam National University; Daejeon 34134 Republic of Korea
| | - So Hyun Ki
- Department of Chemistry; Chungnam National University; Daejeon 34134 Republic of Korea
| | - Sangwon Ko
- Transportation Environmental Research Team; Korea Railroad Research Institute; Uiwang 16105 Republic of Korea
| | - Suyeob Kim
- Department of Marine Biomaterials and Aquaculture; Pukyong National University; Busan 48513 Republic of Korea
| | - Woo Kyung Cho
- Department of Chemistry; Chungnam National University; Daejeon 34134 Republic of Korea
| | - Joon Sig Choi
- Department of Biochemistry; Chungnam National University; Daejeon 34134 Republic of Korea
| | - Sung Min Kang
- Department of Chemistry; Chungbuk National University; Chungbuk 28644 Republic of Korea
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V Bondoc KG, Lembke C, Vyverman W, Pohnert G. Selective chemoattraction of the benthic diatom Seminavis robusta to phosphate but not to inorganic nitrogen sources contributes to biofilm structuring. Microbiologyopen 2018; 8:e00694. [PMID: 30033670 PMCID: PMC6460271 DOI: 10.1002/mbo3.694] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 06/12/2018] [Accepted: 06/20/2018] [Indexed: 11/07/2022] Open
Abstract
Diatoms frequently dominate marine and freshwater biofilms as major primary producers. Nutrient resources in these biofilms are patchily distributed and fluctuate dynamically over time. We recently reported that this spatially and temporally structured environment can be exploited by motile diatoms that use chemoattraction to dissolved silicate (dSi) under Si starvation. Here, we show that the behavioral response of diatoms is more complex and selective as cells are also responding to gradients of dissolved phosphate (dP) when starved in this nutrient. In contrast, neither nitrate nor ammonium (dN) triggers an attractive response under nitrogen limitation. Video monitoring and movement pattern analysis of the model diatom Seminavis robusta revealed that dP attraction is mediated by a combined chemokinetic and chemotactic response. After locating nutrient hotspots, the microalgae slow down and recover from the limitation. The fastest recovery in terms of growth was observed after dSi limitation. In agreement with the lack of directional response, recovery from dN limitation was slowest, indicating that no short-term benefit would be drawn by the algae from the location of transient hotspots of this resource. Our results highlight the ability of diatoms to adapt to nutrient limitation by active foraging and might explain their success in patchy benthic environments.
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Affiliation(s)
- Karen Grace V Bondoc
- Institute for Inorganic and Analytical Chemistry, Bioorganic Analytics, Friedrich-Schiller-Universität Jena, Jena, Germany.,Max Planck Institute for Chemical Ecology, Jena, Germany
| | - Christine Lembke
- Institute for Inorganic and Analytical Chemistry, Bioorganic Analytics, Friedrich-Schiller-Universität Jena, Jena, Germany
| | - Wim Vyverman
- Laboratory of Protistology and Aquatic Ecology, Department of Biology, University Gent, Gent, Belgium
| | - Georg Pohnert
- Institute for Inorganic and Analytical Chemistry, Bioorganic Analytics, Friedrich-Schiller-Universität Jena, Jena, Germany.,Max Planck Institute for Chemical Ecology, Jena, Germany
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Inhibition of Nitzschia ovalis biofilm settlement by a bacterial bioactive compound through alteration of EPS and epiphytic bacteria. ELECTRON J BIOTECHN 2018. [DOI: 10.1016/j.ejbt.2018.03.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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