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Muratova AY, Panchenko LV, Dubrovskaya EV, Lyubun’ EV, Golubev SN, Sungurtseva IY, Zakharevich AM, Biktasheva LR, Galitskaya PY, Turkovskaya OV. Bioremediation Potential of Biochar-Immobilized Cells of Azospirillum brasilense. Microbiology (Reading) 2022. [DOI: 10.1134/s0026261722601336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Probiotic Properties and Immunomodulatory Activity of Lactobacillus Strains Isolated from Dairy Products. Microorganisms 2021; 9:microorganisms9040825. [PMID: 33924561 PMCID: PMC8069045 DOI: 10.3390/microorganisms9040825] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/08/2021] [Accepted: 04/09/2021] [Indexed: 01/09/2023] Open
Abstract
Lactobacilli species are an effective biotherapeutic alternative against bacterial infections and intestinal inflammatory disorders. However, it is important to evaluate their beneficial properties, before considering them as probiotics for medical use. In this study we evaluated some probiotic properties of Lactobacillus rhamnosus GG, Lactobacillus rhamnosus KLSD, Lactobacillus helveticus IMAU70129, and Lactobacillus casei IMAU60214 previously isolated from dairy products and as control Lactobacillus casei Shirota. Experimental evaluations revealed that all strains expressed hydrophobicity (25–40%), auto-aggregation (55–60%), NaCl tolerance (1–4%), adhesion to Caco-2 cells (25–33%), partial inhibition on adherence of Escherichia coli ATCC 35218, Salmonella Typhimurium ATCC 14028, and Staphylococcus aureus ATCC 23219. Cell-free supernatants (CFS) of Lactobacilli also inhibit growth of these pathogens. In immunomodulatory properties a reduction of interleukin-8 (IL-8) and nitric oxide (NO) release was observed in assays with Caco-2 cells stimulated with interleukin-1β (1 ng/mL), or lipopolysaccharide (0.1 µg/mL). On the other hand, the damage induced to Caco-2 cells with sodium dodecyl sulfate (SDS) was attenuated when the cultured cells were pretreated with L. rhamnosus KLDS, L. helveticus IMAU70129 and L. casei IMAU60214. These Lactobacilli possess probiotic properties determined by both an antagonistic activity on pathogenic bacteria and reduction in the inflammatory response of cells treated with SDS, a pro-inflammatory stimulant.
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Characterization of a biosurfactant producing electroactive Bacillus sp. for enhanced Microbial Fuel Cell dye decolourisation. Enzyme Microb Technol 2021; 147:109767. [PMID: 33992401 DOI: 10.1016/j.enzmictec.2021.109767] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 02/19/2021] [Accepted: 02/23/2021] [Indexed: 11/20/2022]
Abstract
A biosurfactant producing Gram positive bacterium isolated from anodic biofilm of textile wastewater fed MFC was identified as Bacillus sp. MFC (Accession number: MT322244). Scanning Electron Microscopy of the bacterium showed appendages, the bacterium forms biofilm on Congo red agar medium. The obtained results showed that the addition of 5 mg/l endogenous biosurfactant to the bacterial cells resulted in 19-fold increase in bacterial surface-bound exopolysaccharides (EPS) and 1.94-fold increase in biofilm. However, when the biosurfactant concentration increased to 20 and 40 mg/l, EPS and biofilm decreased and the cells lost their colony forming ability. The dielectric properties of the bacterial cells showed increase in conductivity and relative permittivity with increasing biosurfactant concentrations. The shape of the voltammogram currents peak, their location and Electrochemical impedance spectroscopy (EIS) suggest the involvement of biofilm as direct electron transfer pathway. The average voltage obtained was 0.65 V as compared to 0.45 V for the control MFC. Decolourization was tested for Congo red in a double chamber Microbial Fuel Cell (MFC), the results showed 2-fold increase in decolourization when biosurfactant is added post biofilm formation. The results confirm that Bacillus sp. MFC possess electrogenic properties and that adding low concentrations of endogenous biosurfactant to 24 h biofilm accelerates electron transfer by inducing perforations in the cell wall and increasing EPS as an electron transfer transient medium. Therefore, MFC performance can be enhanced.
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Hemmatian T, Lee H, Kim J. Bacteria Adhesion of Textiles Influenced by Wettability and Pore Characteristics of Fibrous Substrates. Polymers (Basel) 2021; 13:E223. [PMID: 33440678 PMCID: PMC7827894 DOI: 10.3390/polym13020223] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 01/05/2021] [Accepted: 01/08/2021] [Indexed: 11/16/2022] Open
Abstract
Bacteria adhesion on the surface is an initial step to create biofouling, which may lead to a severe infection of living organisms and humans. This study is concerned with investigating the textile properties including wettability, porosity, total pore volume, and pore size in association with bacteria adhesion. As model bacteria, Gram-negative, rod-shaped Escherichia coli and the Gram-positive, spherical-shaped Staphylococcus aureus were used to analyze the adhesion tendency. Electrospun webs made from polystyrene and poly(lactic acid) were used as substrates, with modification of wettability by the plasma process using either O2 or C4F8 gas. The pore and morphological characteristics of fibrous webs were analyzed by the capillary flow porometer and scanning electron microscopy. The substrate's wettability appeared to be the primary factor influencing the cell adhesion, where the hydrophilic surface resulted in considerably higher adhesion. The pore volume and the pore size, rather than the porosity itself, were other important factors affecting the bacteria adherence and retention. In addition, the compact spatial distribution of fibers limited the cell intrusion into the pores, reducing the total amount of adherence. Thus, superhydrophobic textiles with the reduced total pore volume and smaller pore size would circumvent the adhesion. The findings of this study provide informative discussion on the characteristics of fibrous webs affecting the bacteria adhesion, which can be used as a fundamental design guide of anti-biofouling textiles.
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Affiliation(s)
- Tahmineh Hemmatian
- Department of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea; (T.H.); (H.L.)
| | - Halim Lee
- Department of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea; (T.H.); (H.L.)
| | - Jooyoun Kim
- Department of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea; (T.H.); (H.L.)
- Research Institute of Human Ecology, Seoul National University, Seoul 08826, Korea
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Gomaa OM, Selim NS, Fathy R, Hamed H. Promoting bacteria-anode interfacial electron transfer by palladium nano-complex in double chamber microbial fuel cell. ENVIRONMENTAL TECHNOLOGY 2021; 42:148-159. [PMID: 31140952 DOI: 10.1080/09593330.2019.1625562] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Accepted: 05/17/2019] [Indexed: 06/09/2023]
Abstract
The slow electron transfer between microbial outer membrane and electrode surface is considered one of the limitations of Microbial Fuel Cell (MFC) performance. The aim of the present work is to assess the role of palladium α-lipoic acid nanocomplex compound (PLAC) in promoting bacteria-anode interfacial electron transfer, by studying the dielectric properties of Shewanella oneidensis WW-1 cell membrane and its contribution to biofilm formation on the anode. The results showed that adding PLAC increased bacterial cell membrane permeability and outer cell surface charge. Exopolysaccharides (EPS) and surface-bound proteins increased 2.27 and 1.14 fold, respectively upon adding 0.25% v/v PLAC. Dynamic Light Scattering (DLS) showed uniform distribution of Shewanella-PLAC biocomposite size while Zeta potential and Fourier Transform Infrared (FTIR) Spectroscopy results suggest that PLAC diffused inside the cells. Transmission Electron Microscope (TEM) images reveal Exopolysaccharide (EPS) mat around the cells when PLAC was added to the cells, also confirmed by the FTIR spectrum. Scanning Electron Microscope and Atomic Force Microscope (AFM) confirmed the thickness of biofilm in the presence of PLAC. The average voltage reached 492 mV (external resistance 1 KΩ) over 35 days using 0.25% v/v PLAC as compared to a few hours in MFCs lacking PLAC. The results suggest that the addition of PLAC assisted in interfacial direct electron transfer through enhancing biofilm formation, moreover, its hydrophilic/lipophilic nature facilitated the electron shuttling process from within the bacterial cell to the electrode surface suggesting the involvement of mediated electron transfer as well.
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Affiliation(s)
- Ola M Gomaa
- Radiation Microbiology Department, The National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
| | - Nabila S Selim
- Physics Department, The National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
| | - Reham Fathy
- Radiation Microbiology Department, The National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
| | - Heba Hamed
- Radiation Microbiology Department, The National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
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Selim N, Maghrawy HH, Fathy R, Gamal M, Abd El Kareem H, Bowman K, Brehney M, Kyazze G, Keshavarz T, Gomaa O. Modification of bacterial cell membrane to accelerate decolorization of textile wastewater effluent using microbial fuel cells: role of gamma radiation. JOURNAL OF RADIATION RESEARCH AND APPLIED SCIENCES 2020. [DOI: 10.1080/16878507.2020.1743480] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Nabila Selim
- Radiation Physics Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
| | - Heba Hamed Maghrawy
- Microbiology Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
| | - Reham Fathy
- Microbiology Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
| | - Marwa Gamal
- Microbiology Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
| | - Hussein Abd El Kareem
- Microbiology Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
| | - Kyle Bowman
- School of Life Sciences, University of Westminster, London, UK
| | - Mark Brehney
- School of Life Sciences, University of Westminster, London, UK
| | - Godfrey Kyazze
- School of Life Sciences, University of Westminster, London, UK
| | | | - Ola Gomaa
- Microbiology Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
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Radwan SS, Al-Mailem DM, Kansour MK. Bioaugmentation failed to enhance oil bioremediation in three soil samples from three different continents. Sci Rep 2019; 9:19508. [PMID: 31862978 PMCID: PMC6925256 DOI: 10.1038/s41598-019-56099-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Accepted: 11/30/2019] [Indexed: 11/09/2022] Open
Abstract
Soil samples from Kuwait, Lebanon, Egypt and Germany were polluted with 3% crude oil. Series of samples were left unbioaugmented, others were bioaugmented with Kuwaiti desert soil with a long history of oil pollution and still others with Kuwaiti marine biofouling material. In the samples from Kuwait, Egypt, and Germany, bioaugmentation did not enhance oil removal, whereas it did in the sample from Lebanon. Taxa from the desert-soil bioaugmented batches, but none of those from the biofouling-material bioaugmented ones, succeeded in colonizing the four studied soils. The dynamics of the hydrocarbonoclastic communities during bioremediation were monitored. Those communities differed in composition, not only according to the type of soil, but also for the same soil; at various phases of bioremediation. Although each soil seemed to have its characteristic microflora, they all were similar in harboring lower and higher actinomycetes and pseudomonads in addition to many other taxa. None of the taxa prevailed through all phases of bioremediation. The most powerful isolate in oil-removal; was Rhodococcus erythropolis (Germany), and the weakest was Arthrobacter phenanthrenivorans (Lebanon). The pure hydrocarbonoclastic isolates tolerated unusually high oil concentrations, up to 30%.
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Affiliation(s)
- Samir S Radwan
- Department of Biological Sciences, Faculty of Science, Kuwait University, P O Box 5969, Safat, 13060, Kuwait. .,Von Einem Str. 25, 48159, Münster, Germany.
| | - Dina M Al-Mailem
- Department of Biological Sciences, Faculty of Science, Kuwait University, P O Box 5969, Safat, 13060, Kuwait.
| | - Mayada K Kansour
- Department of Biological Sciences, Faculty of Science, Kuwait University, P O Box 5969, Safat, 13060, Kuwait
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Cui H, Bai M, Sun Y, Abdel-Samie MAS, Lin L. Antibacterial activity and mechanism of Chuzhou chrysanthemum essential oil. J Funct Foods 2018. [DOI: 10.1016/j.jff.2018.07.021] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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Branco R, Sousa T, Piedade AP, Morais PV. Immobilization of Ochrobactrum tritici As5 on PTFE thin films for arsenite biofiltration. CHEMOSPHERE 2016; 146:330-337. [PMID: 26735734 DOI: 10.1016/j.chemosphere.2015.12.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 12/01/2015] [Accepted: 12/08/2015] [Indexed: 06/05/2023]
Abstract
Ochrobactrum tritici SCII24T bacteria is an environmental strain with high capacity to resist to arsenic (As) toxicity, which makes it able to grow in the presence of As(III). The inactivation of the two functional arsenite efflux pumps, ArsB and ACR3_1, resulted in the mutant O. tritici As5 exhibiting a high accumulation of arsenite. This work describes a method for the immobilization of the mutant cells O. tritici As5, on a commercial polymeric net after sputtered modified by the deposition of poly(tetrafluoroethylene) (PTFE) thin films, and demonstrates the capacity of immobilized cells to accumulate arsenic from solutions. Six different set of deposition parameters for PTFE thin films were developed and tested in vitro regarding their ability to immobilize the bacterial cells. The surface that exhibited a mild zeta potential value, hydrophobic characteristics, the lowest surface free energy but with a high polar component and the appropriate ratio of chemical reactive groups allowed cells to proliferate and to grow as a biofilm. These immobilized cells maintained their ability to accumulate the surrounding arsenite, making it a great arsenic biofilter to be used in bioremediation processes.
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Affiliation(s)
- Rita Branco
- CEMUC - Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal; Department of Life Sciences, University of Coimbra, 3001-401 Coimbra, Portugal
| | - Tânia Sousa
- Department of Life Sciences, University of Coimbra, 3001-401 Coimbra, Portugal
| | - Ana P Piedade
- CEMUC - Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal
| | - Paula V Morais
- CEMUC - Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal; Department of Life Sciences, University of Coimbra, 3001-401 Coimbra, Portugal.
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Liu L, Huang Q, Qin B, Zhu G, Wu P, Wu Y. Characterizing cell surface of blooming Microcystis in Lake Taihu, China. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2016; 73:2731-2738. [PMID: 27232410 DOI: 10.2166/wst.2016.069] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Microcystis occurs as colonies in the natural environment but disaggregates into single cells in laboratory cultures. In order to explore the mechanism of how Microcystis forms colonies, the zeta potentials of Microcystis cells from the laboratory and the field were studied, and the hydrophobicity of Microcystis colonies in different sizes was investigated in Lake Taihu. The incubation experiment indicated that the zeta potentials of Microcystis cells were affected by growth phase and species. The absolute values in exponential phase were lower than those in stationary phase, suggesting that the cells with rapid growth easily formed colonies due to more instability on the cell surface. The values of Microcystis aeruginosa were higher than those of Microcystis flos-aquae, which confirmed that M. aeruginosa prevailed in waters for a longer time and at a larger size compared with M. flos-aquae. In another aspect, the absolute zeta potentials of Microcystis spp. at pH 7.0 decreased from spring to autumn in the field; the values in spring were higher than those in summer, suggesting that a large-sized Microcystis colony would more easily form in summer. Additionally, differences in hydrophobicity exist among Microcystis colonies of various sizes. The surface hydrophobicity of colonies in the <20 μm size class was higher than that of larger colonies. This characteristic allowed small colonies to easily form large colonies to survive better. These results would be helpful to understand the mechanism of the bloom formation, especially the colony formation, in Microcystis.
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Affiliation(s)
- Lizhen Liu
- Poyang Lake Research Center, Jiangxi Academy of Sciences, Nanchang 330096, Jiangxi, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, No. 73 East Beijing Road, Nanjing 210008, Jiangsu province, China E-mail:
| | - Qi Huang
- Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang 330022, China
| | - Boqiang Qin
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, No. 73 East Beijing Road, Nanjing 210008, Jiangsu province, China E-mail:
| | - Guangwei Zhu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, No. 73 East Beijing Road, Nanjing 210008, Jiangsu province, China E-mail:
| | - Pan Wu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, No. 73 East Beijing Road, Nanjing 210008, Jiangsu province, China E-mail:
| | - Yongming Wu
- Poyang Lake Research Center, Jiangxi Academy of Sciences, Nanchang 330096, Jiangxi, China
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Zheng M, Yu J. Effect of particle surface charge on drug uptake. EUROPEAN JOURNAL OF NANOMEDICINE 2015. [DOI: 10.1515/ejnm-2015-0015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractIn this paper, it aims to build the relationship of statically electric interaction between the surface charge of a particle drug and cellular uptake. The statically electric theory is applied to study the change of wetting between the drug particle and the cell, a factor that enhanced uptake of cells induced by particle’s surface charge is introduced, then it is formulated according to Kelvin theory for dissolving of solid particle in liquid. It is found that the change of contact angle between the surface charged particle drug and the cell can be detected if the Zeta potential reaches to 6 mV in water like solution, an increase of about 11.1% for the uptake could be obtained for a polymer particle with molar mass
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Husseiny SM, El Kareem HA, Gomaa OM, Talaat R. The role of ethanol in preventing biofilm formation of Penicillium purpurogenum. ANN MICROBIOL 2013. [DOI: 10.1007/s13213-013-0788-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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13
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Gomaa OM, Gaweesh AS. Variation in adhesion and germ tube formation of oral Candida using Egyptian propolis. Can J Microbiol 2013; 59:197-203. [PMID: 23540338 DOI: 10.1139/cjm-2012-0374] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Adhesion of Candida cells to surfaces is considered the first step in colonization. Some natural products, such as propolis, could be used to block cell adhesion and therefore preventing colonization. In this study, Egyptian propolis ethanol extract concentrations in the range of 25 to 125 ng/μL were used to inhibit the adhesion of oral Candida. The exopolysaccharides showed a 2.5-fold decrease, while the surface-bound exopolysaccharides showed only about 1.15-fold decrease. On the other hand, surface-bound proteins decreased by 7.5-fold upon the addition of 75 ng/μL propolis. The inhibition of adhesion was detected by scanning electron microscopy. The non-slip incubation assay showed a significant decrease in germ tube formation (GTF) compared with an increase upon the addition of fetal bovine serum and corn meal, both of which had a positive effect on GTF compared with a negative GTF effect when using propolis, suggesting that propolis could be considered a quorum-sensing molecule. The use of propolis would help in maintaining the cleanliness of dental fixtures and (or) treating recurrent candidiasis as a complementary and alternative treatment, especially in elders and immunocompromised patients.
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Affiliation(s)
- Ola M Gomaa
- Microbiology Department, National Center for Radiation Research and Technology (NCRRT), 3 Ahmad El Zomor Street, P.O. Box 29, Nasr City, Cairo, Egypt.
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Creasey RG, Voelcker NH, Schultz CJ. Investigation of self-assembling proline- and glycine-rich recombinant proteins and peptides inspired by proteins from a symbiotic fungus using atomic force microscopy and circular dichroism spectroscopy. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2012; 1824:711-22. [PMID: 22425601 DOI: 10.1016/j.bbapap.2012.02.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Revised: 01/26/2012] [Accepted: 02/24/2012] [Indexed: 11/29/2022]
Abstract
Fiber-forming proteins and peptides are being scrutinized as a promising source of building blocks for new nanomaterials. Arabinogalactan-like (AGL) proteins expressed at the symbiotic interface between plant roots and arbuscular mycorrhizal fungi have novel sequences, hypothesized to form polyproline II (PPII) helix structures. The functional nature of these proteins is unknown but they may form structures for the establishment and maintenance of fungal hyphae. Here we show that recombinant AGL1 (rAGL1) and recombinant AGL3 (rAGL3) are extended proteins based upon secondary structural characteristics determined by electronic circular dichroism (CD) spectroscopy and can self-assemble into fibers and microtubes as observed by atomic force microscopy (AFM) and scanning electron microscopy (SEM). CD spectroscopy results of synthetic peptides based on repeat regions in AGL1, AGL2 and AGL3 suggest that the synthetic peptides contain significant amounts of extended PPII helices and that these structures are influenced by ionic strength and, at least in one case, by concentration. Point mutations of a single residue of the repeat region of AGL3 resulted in altered secondary structures. Self-assembly of these repeats was observed by means of AFM and optical microscopy. Peptide (APADGK)(6) forms structures with similar morphology to rAGL1 suggesting that these repeats are crucial for the morphology of rAGL1 fibers. These novel self-assembling sequences may find applications as precursors for bioinspired nanomaterials.
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Affiliation(s)
- Rhiannon G Creasey
- School of Chemical and Physical Sciences, Flinders University of South Australia, Australia.
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de-Bashan LE, Schmid M, Rothballer M, Hartmann A, Bashan Y. CELL-CELL INTERACTION IN THE EUKARYOTE-PROKARYOTE MODEL OF THE MICROALGAE CHLORELLA VULGARIS AND THE BACTERIUM AZOSPIRILLUM BRASILENSE IMMOBILIZED IN POLYMER BEADS(1). JOURNAL OF PHYCOLOGY 2011; 47:1350-9. [PMID: 27020359 DOI: 10.1111/j.1529-8817.2011.01062.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Cell-cell interaction in the eukaryote-prokaryote model of the unicellular, freshwater microalga Chlorella vulgaris Beij. and the plant growth-promoting bacterium Azospirillum brasilense, when jointly immobilized in small polymer alginate beads, was evaluated by quantitative fluorescence in situ hybridization (FISH) combined with SEM. This step revealed significant changes, with an increase in the populations of both partners, cluster (mixed colonies) mode of colonization of the bead by the two microorganisms, increase in the size of microalgae-bacterial clusters, movement of the motile bacteria cells toward the immotile microalgae cells within solid matrix, and formation of firm structures among the bacteria, microalgae cells, and the inert matrix that creates a biofilm. This biofilm was sufficiently strong to keep the two species attached to each other, even after eliminating the alginate support. This study showed that the common structural phenotypic interaction of Azospirillum with roots of higher plants, via fibrils and sheath material, is also formed and maintained during the interaction of this bacterium with the surface of rootless single-cell microalgae.
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Affiliation(s)
- Luz E de-Bashan
- Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), Mar Bermejo 195, Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23090, Mexico The Bashan Foundation, 3740 NW Harrison Blvd., Corvallis, Oregon 97330, USAHelmholtz Zentrum München, German Research Centre for Environmental Health, Department of Microbe-Plant Interactions, Ingolstaedter Landstrasse 1, D-85764 Neuherberg, Germany Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), Mar Bermejo 195, Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23090, Mexico The Bashan Foundation, 3740 NW Harrison Blvd., Corvallis, Oregon 97330, USA
| | - Michael Schmid
- Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), Mar Bermejo 195, Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23090, Mexico The Bashan Foundation, 3740 NW Harrison Blvd., Corvallis, Oregon 97330, USAHelmholtz Zentrum München, German Research Centre for Environmental Health, Department of Microbe-Plant Interactions, Ingolstaedter Landstrasse 1, D-85764 Neuherberg, Germany Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), Mar Bermejo 195, Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23090, Mexico The Bashan Foundation, 3740 NW Harrison Blvd., Corvallis, Oregon 97330, USA
| | - Michael Rothballer
- Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), Mar Bermejo 195, Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23090, Mexico The Bashan Foundation, 3740 NW Harrison Blvd., Corvallis, Oregon 97330, USAHelmholtz Zentrum München, German Research Centre for Environmental Health, Department of Microbe-Plant Interactions, Ingolstaedter Landstrasse 1, D-85764 Neuherberg, Germany Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), Mar Bermejo 195, Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23090, Mexico The Bashan Foundation, 3740 NW Harrison Blvd., Corvallis, Oregon 97330, USA
| | - Anton Hartmann
- Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), Mar Bermejo 195, Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23090, Mexico The Bashan Foundation, 3740 NW Harrison Blvd., Corvallis, Oregon 97330, USAHelmholtz Zentrum München, German Research Centre for Environmental Health, Department of Microbe-Plant Interactions, Ingolstaedter Landstrasse 1, D-85764 Neuherberg, Germany Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), Mar Bermejo 195, Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23090, Mexico The Bashan Foundation, 3740 NW Harrison Blvd., Corvallis, Oregon 97330, USA
| | - Yoav Bashan
- Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), Mar Bermejo 195, Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23090, Mexico The Bashan Foundation, 3740 NW Harrison Blvd., Corvallis, Oregon 97330, USAHelmholtz Zentrum München, German Research Centre for Environmental Health, Department of Microbe-Plant Interactions, Ingolstaedter Landstrasse 1, D-85764 Neuherberg, Germany Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), Mar Bermejo 195, Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23090, Mexico The Bashan Foundation, 3740 NW Harrison Blvd., Corvallis, Oregon 97330, USA
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Lin Y, Su Z, Xiao G, Balizan E, Kaur G, Niu Z, Wang Q. Self-assembly of virus particles on flat surfaces via controlled evaporation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:1398-1402. [PMID: 21090822 DOI: 10.1021/la103917x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Dynamic self-assembly of nonvolatile solutes via controlled solvent evaporation has been exploited as a simple route to create a variety of hierarchically assembled structures. In this work, two glass slides were used to form a confined space in which a solution of a rodlike nanoparticle, tobacco mosaic virus (TMV), was evaporated to create large-scale stripe patterns. The height and width of the stripes are dependent on the TMV concentration. The large-scale-patterned surfaces can be applied to control surface hydrophobicity and direct the growth of bone marrow stromal cells. We systematically studied the effects of stripe width and height on surface hydrophobicity using optical microscopy, atomic force microscopy, and contact angle measurements. This technique offers a facile approach to form 2D patterns on a large surface from a wide range of proteins as well as other biomacromolecules.
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Affiliation(s)
- Yuan Lin
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, PR China
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17
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Dobson LF, O’Shea DG. Antagonistic effect of divalent cations Ca2+ and Mg2+ on the morphological development of Streptomyces hygroscopicus var. geldanus. Appl Microbiol Biotechnol 2008; 81:119-26. [DOI: 10.1007/s00253-008-1627-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2008] [Revised: 07/15/2008] [Accepted: 07/18/2008] [Indexed: 01/13/2023]
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18
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De-Bashan LE, Antoun H, Bashan Y. INVOLVEMENT OF INDOLE-3-ACETIC ACID PRODUCED BY THE GROWTH-PROMOTING BACTERIUM AZOSPIRILLUM SPP. IN PROMOTING GROWTH OF CHLORELLA VULGARIS(1). JOURNAL OF PHYCOLOGY 2008; 44:938-47. [PMID: 27041612 DOI: 10.1111/j.1529-8817.2008.00533.x] [Citation(s) in RCA: 107] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Involvement of indole-3-acetic acid (IAA), produced by the microalgae-growth-promoting bacteria Azospirillum brasilens and A. lipoferum, in promoting growth of the microalga Chlorella vulgaris Beij. was studied. Four wildtype strains of Azospirillum and their IAA-deficient mutants were co-immobilized with C. vulgaris in alginate beads. Cultures were grown in synthetic growth medium supplemented with tryptophan. Growth promotion of microalgae and production of exogenous IAA by Azospirillum spp. were monitored. All wildtype Azospirillum spp. produced significant but varying amounts of IAA, while their mutant forms produced significantly less. The results demonstrated a significant growth promotion in Chlorella cultures when immobilized with the four wildtype strains of Azospirillum, while very low or no enhanced growth was induced by the four IAA-deficient mutants, compared to when C. vulgaris is immobilized alone. A complementation experiment, where an IAA-attenuated mutant (A. brasilense SpM7918) was supplemented with IAA produced by its parental wildtype strain (A. brasilense Sp6), restored growth promotion in the microalgae-mutant culture.
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Affiliation(s)
- Luz E De-Bashan
- Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), La Paz, B.C.S. 23090, Mexico Départment des Sols et de Génie Agroalimentaire, Université Laval, Québec City, Québec, Canada Department of Soil, Water and Environmental Science, The University of Arizona, Tucson, Arizona, USADépartment des Sols et de Génie Agroalimentaire, Université Laval, Québec City, Québec, Canada Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), La Paz, B.C.S. 23090, Mexico Départment des Sols et de Génie Agroalimentaire, Université Laval, Québec City, Québec, Canada Department of Soil, Water and Environmental Science, The University of Arizona, Tucson, Arizona, USA
| | - Hani Antoun
- Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), La Paz, B.C.S. 23090, Mexico Départment des Sols et de Génie Agroalimentaire, Université Laval, Québec City, Québec, Canada Department of Soil, Water and Environmental Science, The University of Arizona, Tucson, Arizona, USADépartment des Sols et de Génie Agroalimentaire, Université Laval, Québec City, Québec, Canada Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), La Paz, B.C.S. 23090, Mexico Départment des Sols et de Génie Agroalimentaire, Université Laval, Québec City, Québec, Canada Department of Soil, Water and Environmental Science, The University of Arizona, Tucson, Arizona, USA
| | - Yoav Bashan
- Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), La Paz, B.C.S. 23090, Mexico Départment des Sols et de Génie Agroalimentaire, Université Laval, Québec City, Québec, Canada Department of Soil, Water and Environmental Science, The University of Arizona, Tucson, Arizona, USADépartment des Sols et de Génie Agroalimentaire, Université Laval, Québec City, Québec, Canada Environmental Microbiology Group, Northwestern Center for Biological Research (CIBNOR), La Paz, B.C.S. 23090, Mexico Départment des Sols et de Génie Agroalimentaire, Université Laval, Québec City, Québec, Canada Department of Soil, Water and Environmental Science, The University of Arizona, Tucson, Arizona, USA
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Mitik-Dineva N, Wang J, Mocanasu RC, Stoddart PR, Crawford RJ, Ivanova EP. Impact of nano-topography on bacterial attachment. Biotechnol J 2008; 3:536-44. [DOI: 10.1002/biot.200700244] [Citation(s) in RCA: 147] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Palmer J, Flint S, Brooks J. Bacterial cell attachment, the beginning of a biofilm. J Ind Microbiol Biotechnol 2007; 34:577-88. [PMID: 17619090 DOI: 10.1007/s10295-007-0234-4] [Citation(s) in RCA: 359] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2007] [Accepted: 06/07/2007] [Indexed: 10/23/2022]
Abstract
The ability of bacteria to attach to surfaces and develop into a biofilm has been of considerable interest to many groups in numerous industries, including the medical and food industry. However, little is understood in the critical initial step seen in all biofilm development, the initial bacterial cell attachment to a surface. This initial attachment is critical for the formation of a bacterial biofilm, as all other cells within a biofilm structure rely on the interaction between surface and bacterial cell for their survival. This review examines what are believed to be some of the most important aspects involved in bacterial attachment to a surface.
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Affiliation(s)
- Jon Palmer
- Institute of Food Nutrition and Human Health, Massey University, Palmerston North, New Zealand.
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Lehmann J, Rondon M. Bio-Char Soil Management on Highly Weathered Soils in the Humid Tropics. BIOLOGICAL APPROACHES TO SUSTAINABLE SOIL SYSTEMS 2006. [DOI: 10.1201/9781420017113.ch36] [Citation(s) in RCA: 157] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Biondi EG, Marini F, Altieri F, Bonzi L, Bazzicalupo M, Del Gallo M. Extended phenotype of an mreB-like mutant in Azospirillum brasilense. MICROBIOLOGY-SGM 2004; 150:2465-2474. [PMID: 15256588 DOI: 10.1099/mic.0.26904-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Tn5 mutagenesis was used to generate an Azospirillum brasilense SPF94 mutant. Genetic analysis of this mutant revealed that a homologue of the mreB gene, which controls cell shape in Bacillus subtilis and Escherichia coli, was inactivated. The cell-surface properties of the mutant were different from those of the parental strain. The mutant colonies were highly fluorescent when grown on plates containing Calcofluor White. Light and electron microscopy revealed that the mutant cells were round and had thicker capsules than the spiral parental strain. The mutants contained up to ten times more capsule protein than the parental strain, but lacked a 40 kDa protein that is abundant in the parental strain. The phenotype of the isolated mutant resembled that of the cyst-like differentiated forms of Azospirillum, suggesting that the mreB homologue could be involved in differentiation.
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Affiliation(s)
- Emanuele G Biondi
- Dip. Biologia Animale e Genetica, Università di Firenze, 50125 Firenze, Italy
| | - Francesca Marini
- Dip. Agrobiologia e Agrochimica, Università della Tuscia, 01100 Viterbo, Italy
| | - Fabio Altieri
- Dip. Scienze Biochimiche, Università 'La Sapienza', 00185 Roma, Italy
| | - Laura Bonzi
- Dip. Biologia Vegetale, Università di Firenze, 50100 Firenze, Italy
| | - Marco Bazzicalupo
- Dip. Biologia Animale e Genetica, Università di Firenze, 50125 Firenze, Italy
| | - Maddalena Del Gallo
- Dip. Biologia di Base e Applicata, Università dell'Aquila, Via Vetoio, Coppito, 67100 L'Aquila, Italy
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Bashan Y, Holguin G, de-Bashan LE. Azospirillum-plant relationships: physiological, molecular, agricultural, and environmental advances (1997-2003). Can J Microbiol 2004; 50:521-77. [PMID: 15467782 DOI: 10.1139/w04-035] [Citation(s) in RCA: 267] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This review presents a critical and comprehensive documentation and analysis of the developments in agricultural, environmental, molecular, and physiological studies related to Azospirillum cells, and to Azospirillum interactions with plants, based solely on information published between 1997 and 2003. It was designed as an update of previous reviews (Bashan and Levanony 1990; Bashan and Holguin 1997a), with a similar scope of interest. Apart from an update and critical analysis of the current knowledge, this review focuses on the central issues of Azospirillum research today, such as, (i) physiological and molecular studies as a general model for rhizosphere bacteria; (ii) co-inoculation with other microorganisms; (iii) hormonal studies and re-consideration of the nitrogen contribution by the bacteria under specific environmental conditions; (iv) proposed Azospirillum as a non-specific plant-growth-promoting bacterium; (v) re-introduction of the "Additive Hypothesis," which suggests involvement of multiple mechanisms employed by the bacteria to affect plant growth; (vi) comment on the less researched areas, such as inoculant and pesticide research; and (vii) proposes possible avenues for the exploitation of this bacterium in environmental areas other than agriculture.Key words: Azospirillum, plant–bacteria interaction, plant-growth-promoting bacteria, PGPB, PGPR, rhizosphere bacteria.
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Affiliation(s)
- Yoav Bashan
- Environmental Microbiology Group, Center for Biological Research of the Northwest (CIB), P.O. Box 128, La Paz, B.C.S 23000, Mexico.
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Szarka K, Temesvári P, Kerekes A, Tege A, Repkény A. Neonatal pneumonia caused by Trichomonas vaginalis. Acta Microbiol Immunol Hung 2002; 49:15-9. [PMID: 12073821 DOI: 10.1556/amicr.49.2002.1.2] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The authors present two cases of newborn babies infected by Trichomonas vaginalis (hereafter referred to as T. vaginalis) and suffering from severe congenital breathing difficulties and needing artificial respiration. Microscopic examination of the tracheal discharge revealed characteristically moving, flagellated, pear-shaped unicellular organisms. Cultures on CPLM medium proved the presence of T. vaginalis. During pregnancy the mothers' clinical status was negative and both of them mentioned leukorrhoea of changing intensity. They were regularly involved in antenatal care. The infection caused by T. vaginalis could be detected in the two mothers later by culture procedures.
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Affiliation(s)
- K Szarka
- Laboratory of Microbiology, National Institute of Health, Bács-Kiskun County, Kecskemét (NPHMOS), PO Box 119, H-6001 Kecskemét, Hungary
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Fourier transform infrared spectroscopic characterisation of heavy metal-induced metabolic changes in the plant-associated soil bacterium Azospirillum brasilense Sp7. J Mol Struct 2002. [DOI: 10.1016/s0022-2860(02)00021-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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26
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Kamnev A, Tarantilis P, Antonyuk L, Bespalova L, Polissiou M, Colina M, Gardiner P, Ignatov V. Fourier transform Raman spectroscopic characterisation of cells of the plant-associated soil bacterium Azospirillum brasilense Sp7. J Mol Struct 2001. [DOI: 10.1016/s0022-2860(00)00877-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Castellanos T, Ascencio F, Bashan Y. Starvation-induced changes in the cell surface of Azospirillum lipoferum. FEMS Microbiol Ecol 2000; 33:1-9. [PMID: 10922497 DOI: 10.1111/j.1574-6941.2000.tb00720.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Three starvation regimes (a deficient culture medium, a saline buffer solution and distilled water) were evaluated for their possible effect on cell surface characteristics of Azospirillum lipoferum 1842 related to the initial adsorption of the bacterium to surfaces. The bacteria survived for 7 days in all media although they did not multiply. Upon transfer from a rich growth medium (nutrient agar) to starvation conditions, cell surface hydrophobicity dropped sharply but recovered its initial value within 24 to 48 h, except in phosphate-buffered saline, the length of the recovery period depending on the starvation medium. Starvation affected the sugar affinity of the A. lipoferum cell surface mainly towards p-aminophenyl-alpha-D-mannopyranoside, to a lesser extent to glucose, but not to other monosaccharides tested. Starvation changed the concentration of several cell surface proteins but did not induce the synthesis of new ones. The cell surface hydrophobic protein (43 kDa) of A. lipoferum 1842 was unaffected by any starvation treatment for a period of up to 48 h, but later disappeared. These data showed that starvation is not a major factor in inducing changes in the cell surface which lead to the primary phase of attachment of Azospirillum to surfaces.
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Affiliation(s)
- Thelma Castellanos
- Environmental Microbiology, The Center for Biological Research of the Northwest (CIB), A.P. 128 23000 La Paz, Baja California Sur, Mexico
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Spectroscopic characterization of cell membranes and their constituents of the plant-associated soil bacterium Azospirillum brasilense. J Mol Struct 1999. [DOI: 10.1016/s0022-2860(98)00712-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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