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Woźnica A, Karczewski J, Bernaś T, Świątek P, Drab M, Surma R, Krzyżowski M, Łozowski B, Gwiazda R, Libera M, Absalon D, Babczyńska A. The spatial structure (3D) and mechanical properties of the sponge Spongilla lacustris L. (Porifera: Spongillida) skeleton as a potential tensegral architecture. THE EUROPEAN ZOOLOGICAL JOURNAL 2022. [DOI: 10.1080/24750263.2022.2105964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022] Open
Affiliation(s)
- A. Woźnica
- Faculty of Natural Sciences, Silesian Water Centre, University of Silesia in Katowice, Katowice, Poland
| | - J. Karczewski
- Faculty of Natural Sciences, Silesian Water Centre, University of Silesia in Katowice, Katowice, Poland
| | - T. Bernaś
- Department of Anatomy and Neurobiology, Virginia Commonwealth University School of Medicine, Richmond, Virginia, USA
| | - P. Świątek
- Faculty of Natural Sciences, Institute of Biology, Biotechnology and Environmental Protection, University of Silesia in Katowice, Katowice, Poland
| | - M. Drab
- USI, Unit of Nanostructural Bio-Interactions, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wrocław, Poland
| | - R. Surma
- Faculty of Natural Sciences, Silesian Water Centre, University of Silesia in Katowice, Katowice, Poland
| | - M. Krzyżowski
- Faculty of Natural Sciences, Silesian Water Centre, University of Silesia in Katowice, Katowice, Poland
| | - B. Łozowski
- Faculty of Natural Sciences, Silesian Water Centre, University of Silesia in Katowice, Katowice, Poland
| | - R. Gwiazda
- Institute of Nature Conservation, Polish Academy of Sciences, Kraków, Poland
| | - M. Libera
- Faculty of Science and Technology, Institute of Chemistry, University of Silesia in Katowice, Katowice, Poland
| | - D. Absalon
- Faculty of Natural Sciences, Silesian Water Centre, University of Silesia in Katowice, Katowice, Poland
| | - A. Babczyńska
- Faculty of Natural Sciences, Silesian Water Centre, University of Silesia in Katowice, Katowice, Poland
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Modeling of Nitrification Kinetics in a Respirometric Biosensor under Suboptimal Conditions. WATER 2022. [DOI: 10.3390/w14132031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Sensitive detection with cell biosensors requires optimization of their working conditions and standardization of the response in variable physicochemical conditions. The introduction of an analyte to a sensor, which contributes to this variability, may account for the modeling of microbial metabolism. We constructed a multiparameter model of a water toxicity sensor of Automatic Biodetector for Water Toxicity (ABTOW), developed by our group and based on nitrifying bacteria. The model describes the kinetics of nitrification as a function of four orthogonal parameters: temperature, pH, oxygen and ammonium concentration. Furthermore, we characterized the signal-to-noise ratio (SNR) of the ABTOW readout as a function of these parameters. Thus, a region of parameter space corresponding to optimal ABTOW operation is identified and its sensitivity quantified. We applied the model to describe the ABTOW performance in non-equilibrium conditions produced by rapid changes in pH and temperature. In sum, the model based on four physicochemical parameters describes changes in the biosensor’s activity, the biological element of which are nitrifying bacteria characterized by simple chemolithoautotrophic metabolism. The description of reaction kinetics through multiparameter modeling in combination with stability analysis can find application in process control in biotechnology, biodetection and environmental research.
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de Melo WCMA, Avci P, de Oliveira MN, Gupta A, Vecchio D, Sadasivam M, Chandran R, Huang YY, Yin R, Perussi LR, Tegos GP, Perussi JR, Dai T, Hamblin MR. Photodynamic inactivation of biofilm: taking a lightly colored approach to stubborn infection. Expert Rev Anti Infect Ther 2014; 11:669-93. [PMID: 23879608 DOI: 10.1586/14787210.2013.811861] [Citation(s) in RCA: 116] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Microbial biofilms are responsible for a variety of microbial infections in different parts of the body, such as urinary tract infections, catheter infections, middle-ear infections, gingivitis, caries, periodontitis, orthopedic implants, and so on. The microbial biofilm cells have properties and gene expression patterns distinct from planktonic cells, including phenotypic variations in enzymic activity, cell wall composition and surface structure, which increase the resistance to antibiotics and other antimicrobial treatments. There is consequently an urgent need for new approaches to attack biofilm-associated microorganisms, and antimicrobial photodynamic therapy (aPDT) may be a promising candidate. aPDT involves the combination of a nontoxic dye and low-intensity visible light which, in the presence of oxygen, produces cytotoxic reactive oxygen species. It has been demonstrated that many biofilms are susceptible to aPDT, particularly in dental disease. This review will focus on aspects of aPDT that are designed to increase efficiency against biofilms modalities to enhance penetration of photosensitizer into biofilm, and a combination of aPDT with biofilm-disrupting agents.
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Affiliation(s)
- Wanessa C M A de Melo
- The Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA, USA
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Karcz J, Bernas T, Nowak A, Talik E, Woznica A. Application of lyophilization to prepare the nitrifying bacterial biofilm for imaging with scanning electron microscopy. SCANNING 2012; 34:26-36. [PMID: 21866557 DOI: 10.1002/sca.20275] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Accepted: 07/11/2011] [Indexed: 05/31/2023]
Abstract
Structure of bacterial biofilms may be investigated using several variants of scanning electron microscopy (SEM). We apply lyophilization to prepare nitrifying bacterial biofilm for conventional SEM imaging in high-vacuum mode (CSEM). We therefore replace standard biofilm fixation in glutaraldehyde cross-linking, ethanol dehydration, and critical-point drying (CPD) with less-invasive low-temperature drying by sublimation in vacuum. We compare this approach with: (1) standard preparation with glutaraldehyde fixation, ethanol dehydration, and CPD before CSEM, (2) cryo-sputter preparation of rapidly frozen biofilm in hydrated state (cryo-SEM), and (3) in situ observation without any sample pretreatment in environmental SEM. Combined imaging with these modalities revealed two distinct immobilization patterns on the polyurethane foam: (1) large irregular aggregates (flocs) of bacterial biofilm that exist as irregular biofilm fragments, rope-like structures, or biofilm layers on the foam surface; (2) biofilm threads adherent to the surface of polyurethane foam. Our results indicate that lyophilization was suitable for preservation of bacterial cells and many forms of structure of extracellular matrix. The lyophilized material could be imaged with high resolution (using CSEM) to generate structural information complementary to that obtained with other SEM techniques.
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Affiliation(s)
- Jagna Karcz
- Laboratory of Scanning Electron Microscopy, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland.
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