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Journal articles on the topic 'Phototrophic microorganisms'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Eiler, Alexander, Sara Beier, Christin Sï¿½wstrï¿½m, Jan Karlsson, and Stefan Bertilsson. "High Ratio of Bacteriochlorophyll Biosynthesis Genes to Chlorophyll Biosynthesis Genes in Bacteria of Humic Lakes." Applied and Environmental Microbiology 75, no. 22 (October 2, 2009): 7221–28. http://dx.doi.org/10.1128/aem.00960-09.

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ABSTRACT Recent studies highlight the diversity and significance of marine phototrophic microorganisms such as picocyanobacteria, phototrophic picoeukaryotes, and bacteriochlorophyll- and rhodopsin-holding phototrophic bacteria. To assess if freshwater ecosystems also harbor similar phototroph diversity, genes involved in the biosynthesis of bacteriochlorophyll and chlorophyll were targeted to explore oxygenic and aerobic anoxygenic phototroph composition in a wide range of lakes. Partial dark-operative protochlorophyllide oxidoreductase (DPOR) and chlorophyllide oxidoreductase (COR) genes in bacteria of seven lakes with contrasting trophic statuses were PCR amplified, cloned, and sequenced. Out of 61 sequences encoding the L subunit of DPOR (L-DPOR), 22 clustered with aerobic anoxygenic photosynthetic bacteria, whereas 39 L-DPOR sequences related to oxygenic phototrophs, like cyanobacteria, were observed. Phylogenetic analysis revealed clear separation of these freshwater L-DPOR genes as well as 11 COR gene sequences from their marine counterparts. Terminal restriction fragment length analysis of L-DPOR genes was used to characterize oxygenic aerobic and anoxygenic photosynthesizing populations in 20 lakes differing in physical and chemical characteristics. Significant differences in L-DPOR community composition were observed between dystrophic lakes and all other systems, where a higher proportion of genes affiliated with aerobic anoxygenic photosynthetic bacteria was observed than in other systems. Our results reveal a significant diversity of phototrophic microorganisms in lakes and suggest niche partitioning of oxygenic and aerobic anoxygenic phototrophs in these systems in response to trophic status and coupled differences in light regime.

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2

Gogotov, Ivan N. "Hydrogenases of phototrophic microorganisms." Biochimie 68, no. 1 (January 1986): 181–87. http://dx.doi.org/10.1016/s0300-9084(86)81082-3.

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3

Allen, Joey L., Loïc Ten-Hage, and Joséphine Leflaive. "Allelopathic interactions involving benthic phototrophic microorganisms." Environmental Microbiology Reports 8, no. 5 (July 12, 2016): 752–62. http://dx.doi.org/10.1111/1758-2229.12436.

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4

O., Pulz. "Photobioreactors: production systems for phototrophic microorganisms." Applied Microbiology and Biotechnology 57, no. 3 (October 1, 2001): 287–93. http://dx.doi.org/10.1007/s002530100702.

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5

Bolivar-Galiano, Fernando, Oana Adriana Cuzman, Clara Abad-Ruiz, and Pedro Sánchez-Castillo. "Facing Phototrophic Microorganisms That Colonize Artistic Fountains and Other Wet Stone Surfaces: Identification Keys." Applied Sciences 11, no. 18 (September 21, 2021): 8787. http://dx.doi.org/10.3390/app11188787.

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All fountains are inhabited by phototrophic microorganisms, especially if they are functional and located outdoors. This fact, along with the regular presence of water and the intrinsic bioreceptivity of stone material, easily favors the biological development. Many of these organisms are responsible for the biodeterioration phenomena and recognizing them could help to define the best strategies for the conservation and maintenance of monumental fountains. The presence of biological growth involves different activities for the conservation of artistic fountains. This paper is a review of the phototrophic biodiversity reported in 46 fountains and gives a whole vision on coping with biodeteriogens of fountains, being an elementary guide for professionals in the field of stone conservation. It is focused on recognizing the main phototrophs by using simplified dichotomous keys for cyanobacteria, green algae and diatoms. Some basic issues related to the handling of the samples and with the control of these types of microalgae are also briefly described, in order to assist interested professionals when dealing with the biodiversity of monumental fountains.

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6

Suzuki, Eiji, and Ryuichiro Suzuki. "Variation of Storage Polysaccharides in Phototrophic Microorganisms." Journal of Applied Glycoscience 60, no. 1 (2013): 21–27. http://dx.doi.org/10.5458/jag.jag.jag-2012_016.

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7

Fahey, R. C., R. M. Buschbacher, and G. L. Newton. "Evolution of glutathione metabolism in phototrophic microorganisms." Origins of Life and Evolution of the Biosphere 16, no. 3-4 (September 1986): 315–16. http://dx.doi.org/10.1007/bf02422045.

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8

Morgan-Kiss, Rachael M., John C. Priscu, Tessa Pocock, Loreta Gudynaite-Savitch, and Norman P. A. Huner. "Adaptation and Acclimation of Photosynthetic Microorganisms to Permanently Cold Environments." Microbiology and Molecular Biology Reviews 70, no. 1 (March 2006): 222–52. http://dx.doi.org/10.1128/mmbr.70.1.222-252.2006.

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SUMMARY Persistently cold environments constitute one of our world's largest ecosystems, and microorganisms dominate the biomass and metabolic activity in these extreme environments. The stress of low temperatures on life is exacerbated in organisms that rely on photoautrophic production of organic carbon and energy sources. Phototrophic organisms must coordinate temperature-independent reactions of light absorption and photochemistry with temperature-dependent processes of electron transport and utilization of energy sources through growth and metabolism. Despite this conundrum, phototrophic microorganisms thrive in all cold ecosystems described and (together with chemoautrophs) provide the base of autotrophic production in low-temperature food webs. Psychrophilic (organisms with a requirement for low growth temperatures) and psychrotolerant (organisms tolerant of low growth temperatures) photoautotrophs rely on low-temperature acclimative and adaptive strategies that have been described for other low-temperature-adapted heterotrophic organisms, such as cold-active proteins and maintenance of membrane fluidity. In addition, photoautrophic organisms possess other strategies to balance the absorption of light and the transduction of light energy to stored chemical energy products (NADPH and ATP) with downstream consumption of photosynthetically derived energy products at low temperatures. Lastly, differential adaptive and acclimative mechanisms exist in phototrophic microorganisms residing in low-temperature environments that are exposed to constant low-light environments versus high-light- and high-UV-exposed phototrophic assemblages.

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9

Nübel, Ulrich, Ferran Garcia-Pichel, Michael Kühl, and Gerard Muyzer. "Quantifying Microbial Diversity: Morphotypes, 16S rRNA Genes, and Carotenoids of Oxygenic Phototrophs in Microbial Mats." Applied and Environmental Microbiology 65, no. 2 (February 1, 1999): 422–30. http://dx.doi.org/10.1128/aem.65.2.422-430.1999.

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ABSTRACT We quantified the diversity of oxygenic phototrophic microorganisms present in eight hypersaline microbial mats on the basis of three cultivation-independent approaches. Morphological diversity was studied by microscopy. The diversity of carotenoids was examined by extraction from mat samples and high-pressure liquid chromatography analysis. The diversity of 16S rRNA genes from oxygenic phototrophic microorganisms was investigated by extraction of total DNA from mat samples, amplification of 16S rRNA gene segments from cyanobacteria and plastids of eukaryotic algae by phylum-specific PCR, and sequence-dependent separation of amplification products by denaturing-gradient gel electrophoresis. A numerical approach was introduced to correct for crowding the results of chromatographic and electrophoretic analyses. Diversity estimates typically varied up to twofold among mats. The congruence of richness estimates and Shannon-Weaver indices based on numbers and proportional abundances of unique morphotypes, 16S rRNA genes, and carotenoids unveiled the underlying diversity of oxygenic phototrophic microorganisms in the eight mat communities studied.

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10

Jurado, Valme, Yolanda del Rosal, Jose Gonzalez-Pimentel, Bernardo Hermosin, and Cesareo Saiz-Jimenez. "Biological Control of Phototrophic Biofilms in a Show Cave: The Case of Nerja Cave." Applied Sciences 10, no. 10 (May 16, 2020): 3448. http://dx.doi.org/10.3390/app10103448.

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Cyanobacteria and microalgae are usually found in speleothems, rocks and walls of show caves exposed to artificial lighting. These microorganisms develop as biofilms coating the mineral surfaces and producing aesthetic, physical and chemical deterioration. A wide number of physical, chemical and environmental-friendly methods have been used for controlling the biofilms with different results. Natural biological control has been suggested by some authors as a theoretical approach but without direct evidence or application. Here we report the finding of a natural biological control of phototrophic biofilms on the speleothems of Nerja Cave, Malaga, Spain. The formation of plaques or spots where the phototrophic microorganisms disappeared can be assumed on the basis of processes of predation of bacteria, amoebas and some other organisms on the phototrophic biofilms. This study aims at investigating the potentialities of the biological control of phototrophic biofilms in caves, but the originality of these data should be confirmed in future studies with a larger number of biofilm samples in different ecological scenarios.

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11

Didovich, S. V., O. P. Alekseenko, A. N. Pas, and A. N. Didovich. "Phototrophic microorganisms for agricultural technology and food security." IOP Conference Series: Earth and Environmental Science 422 (January 9, 2020): 012042. http://dx.doi.org/10.1088/1755-1315/422/1/012042.

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12

Bolatkhan, Kenzhegul, Bekzhan D. Kossalbayev, Bolatkhan K. Zayadan, Tatsuya Tomo, T. Nejat Veziroglu, and Suleyman I. Allakhverdiev. "Hydrogen production from phototrophic microorganisms: Reality and perspectives." International Journal of Hydrogen Energy 44, no. 12 (March 2019): 5799–811. http://dx.doi.org/10.1016/j.ijhydene.2019.01.092.

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13

Miltner, Anja, Frank-Dieter Kopinke, Reimo Kindler, Draženka Selesi, Anton Hartmann, and Matthias Kästner. "Non-phototrophic CO 2 fixation by soil microorganisms." Plant and Soil 269, no. 1-2 (February 2005): 193–203. http://dx.doi.org/10.1007/s11104-004-0483-1.

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14

Fahey, Robert C., Ralph M. Buschbacher, and Gerald L. Newton. "The evolution of glutathione metabolism in phototrophic microorganisms." Journal of Molecular Evolution 25, no. 1 (May 1987): 81–88. http://dx.doi.org/10.1007/bf02100044.

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15

Kushkevych, Ivan, Jiří Procházka, Márió Gajdács, Simon K. M. R. Rittmann, and Monika Vítězová. "Molecular Physiology of Anaerobic Phototrophic Purple and Green Sulfur Bacteria." International Journal of Molecular Sciences 22, no. 12 (June 15, 2021): 6398. http://dx.doi.org/10.3390/ijms22126398.

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There are two main types of bacterial photosynthesis: oxygenic (cyanobacteria) and anoxygenic (sulfur and non-sulfur phototrophs). Molecular mechanisms of photosynthesis in the phototrophic microorganisms can differ and depend on their location and pigments in the cells. This paper describes bacteria capable of molecular oxidizing hydrogen sulfide, specifically the families Chromatiaceae and Chlorobiaceae, also known as purple and green sulfur bacteria in the process of anoxygenic photosynthesis. Further, it analyzes certain important physiological processes, especially those which are characteristic for these bacterial families. Primarily, the molecular metabolism of sulfur, which oxidizes hydrogen sulfide to elementary molecular sulfur, as well as photosynthetic processes taking place inside of cells are presented. Particular attention is paid to the description of the molecular structure of the photosynthetic apparatus in these two families of phototrophs. Moreover, some of their molecular biotechnological perspectives are discussed.

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16

Jinkerson, Robert E., Venkataramanan Subramanian, and Matthew C. Posewitz. "Improving biofuel production in phototrophic microorganisms with systems biology." Biofuels 2, no. 2 (March 2011): 125–44. http://dx.doi.org/10.4155/bfs.11.7.

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17

Vila, X., and CA Abella. "Spectroradiometric identification of phototrophic microorganisms in planktonic aquatic environments." Aquatic Microbial Ecology 20 (1999): 225–30. http://dx.doi.org/10.3354/ame020225.

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18

Pulz, O., and P. Kretschmer. "Perspectives of phototrophic microorganisms in environment protection and ecology." Acta Biotechnologica 12, no. 6 (1992): 517–20. http://dx.doi.org/10.1002/abio.370120615.

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19

Pick, F. R., and D. A. Caron. "Picoplankton and Nanoplankton Biomass in Lake Ontario: Relative Contribution of Phototrophic and Heterotrophic Communities." Canadian Journal of Fisheries and Aquatic Sciences 44, no. 12 (December 1, 1987): 2164–72. http://dx.doi.org/10.1139/f87-265.

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The seasonal and vertical abundance of phototrophic and heterotrophic nanoplankton (2–20 μm) and picoplankton (0.2–2 μm) was estimated in Lake Ontario during 1982 by epifluorescence microscopy. Phototrophic and heterotrophic nanoplankton abundance differed by less than an order of magnitude and was typically present at densities of 103 cells∙mL−1. Heterotrophic nanoplankton was, on average, only half as abundant as phototrophic nanoplankton, but on several dates was more abundant than the latter. Both populations peaked in late June to early July. Phototrophic picoplankton, primarily chroococcoid cyanobacteria, increased rapidly during midsummer, reaching a maximum epilimnetic concentration of 4 × 105 cells∙mL−1 in late August. Heterotrophic picoplankton (bacteria) showed a similar seasonal pattern, reaching maximum abundance in September (6 × 106) cells∙mL−1). The concentrations of both picoplankton populations were significantly correlated with temperature. By late summer, picoplankton biomass represented 74% and pico-cyanobacteria alone 50% of the total weight biomass of microorganisms < 20 μm; these populations are generally missed by inverted microscope techniques.

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20

Gorelova, O. A., I. A. Kosevich, O. I. Baulina, T. A. Fedorenko, A. Z. Torshkhoeva, and E. S. Lobakova. "Associations between the White Sea invertebrates and oxygen-evolving phototrophic microorganisms." Moscow University Biological Sciences Bulletin 64, no. 1 (March 2009): 16–22. http://dx.doi.org/10.3103/s0096392509010040.

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21

Gorin, K., V. Pojidaev, A. Borgolov, and Y. Sergeeva. "Phototrophic microorganisms biomass production with joint utilization of city surface water." IOP Conference Series: Earth and Environmental Science 337 (November 16, 2019): 012006. http://dx.doi.org/10.1088/1755-1315/337/1/012006.

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22

Beck, Christian, Henning Knoop, Ilka M. Axmann, and Ralf Steuer. "The diversity of cyanobacterial metabolism: genome analysis of multiple phototrophic microorganisms." BMC Genomics 13, no. 1 (2012): 56. http://dx.doi.org/10.1186/1471-2164-13-56.

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23

Havel, Jan, Ezequiel Franco-Lara, and Dirk Weuster-Botz. "A parallel bubble column system for the cultivation of phototrophic microorganisms." Biotechnology Letters 30, no. 7 (May 17, 2008): 1197–200. http://dx.doi.org/10.1007/s10529-008-9680-y.

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24

Ortega-Calvo, J. J., X. Ariño, M. Hernandez-Marine, and C. Saiz-Jimenez. "Factors affecting the weathering and colonization of monuments by phototrophic microorganisms." Science of The Total Environment 167, no. 1-3 (May 1995): 329–41. http://dx.doi.org/10.1016/0048-9697(95)04593-p.

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25

Elloumi, Jannet, Wassim Guermazi, Habib Ayadi, Abderrahmen Bouain, and Lotfi Aleya. "Abundance and biomass of prokaryotic and eukaryotic microorganisms coupled with environmental factors in an arid multi-pond solar saltern (Sfax, Tunisia)." Journal of the Marine Biological Association of the United Kingdom 89, no. 2 (July 29, 2008): 243–53. http://dx.doi.org/10.1017/s0025315408002269.

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The distribution of abundance and biomass of prokaryotes, flagellates, ciliates and phytoplankton, were studied in five ponds of increasing salinity in the Sfax solar saltern (Tunisia) coupled with environmental factors. The results showed that abundance of eukaryotic microorganisms decreased with increasing salinity of the ponds whereas prokaryotes (heterotrophic bacteria and Archaea) were abundant in the hyper-saline ponds. Phototrophic picoplankton was found in a large range of salinity values (70 and 200‰). Phototrophic non-flagellated nanoplankton which dominated in the first sampled pond was substituted by phototrophic flagellated nanoplankton in the other ponds. Heterotrophic nanoplankton dominated in the crystallizer pond but its quantitative importance declined in the less saline ponds. Diatoms and dinoflagellates were the major contributors to phytoplankton abundance in the first ponds (>90% of total abundance). Ciliated protozoa were found in all the ponds except in the crystallizer in which prokaryotes proliferated. Oligotrichida and Heterotrichida were the most abundant ciliate groups. Overall, species richness decreased with salinity gradient. We propose a simplified diagram of the Sfax saltern's food web showing the dominant role of the microbial loop along the salinity gradient.

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26

Rodrigo, María A., Antonio Camacho, Eduardo Vicente, and María R. Miracle. "Microstratified vertical distribution and migration of phototrophic microorganisms during a diel cycle in Lake Arcas-2 (Spain)." Fundamental and Applied Limnology 145, no. 4 (July 26, 1999): 497–512. http://dx.doi.org/10.1127/archiv-hydrobiol/145/1999/497.

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27

Vasilieva, S. G., E. S. Lobakova, A. S. Morozov, K. A. Shibzuhova, M. V. Titova, and A. M. Nosov. "New Polyethylenimine-Based Polycationic Polymers with Plant Additives for Immobilizing Phototrophic Microorganisms." Nanotechnologies in Russia 15, no. 1 (January 2020): 28–36. http://dx.doi.org/10.1134/s1995078020010061.

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28

Prieto, B., T. Rivas, and B. Silva. "Rapid Quantification of Phototrophic Microorganisms and their Physiological State through their Colour." Biofouling 18, no. 3 (January 2002): 237–45. http://dx.doi.org/10.1080/08927010290014917.

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29

Stomp, Maayke, Jef Huisman, Lucas J. Stal, and Hans C. P. Matthijs. "Colorful niches of phototrophic microorganisms shaped by vibrations of the water molecule." ISME Journal 1, no. 4 (July 12, 2007): 271–82. http://dx.doi.org/10.1038/ismej.2007.59.

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30

Pjevac, Petra, Marino Korlević, Jasmine S. Berg, Elvira Bura-Nakić, Irena Ciglenečki, Rudolf Amann, and Sandi Orlić. "Community Shift from Phototrophic to Chemotrophic Sulfide Oxidation following Anoxic Holomixis in a Stratified Seawater Lake." Applied and Environmental Microbiology 81, no. 1 (October 24, 2014): 298–308. http://dx.doi.org/10.1128/aem.02435-14.

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ABSTRACTMost stratified sulfidic holomictic lakes become oxygenated after annual turnover. In contrast, Lake Rogoznica, on the eastern Adriatic coast, has been observed to undergo a period of water column anoxia after water layer mixing and establishment of holomictic conditions. Although Lake Rogoznica's chemistry and hydrography have been studied extensively, it is unclear how the microbial communities typically inhabiting the oxic epilimnion and a sulfidic hypolimnion respond to such a drastic shift in redox conditions. We investigated the impact of anoxic holomixis on microbial diversity and microbially mediated sulfur cycling in Lake Rogoznica with an array of culture-independent microbiological methods. Our data suggest a tight coupling between the lake's chemistry and occurring microorganisms. During stratification, anoxygenic phototrophic sulfur bacteria were dominant at the chemocline and in the hypolimnion. After an anoxic mixing event, the anoxygenic phototrophic sulfur bacteria entirely disappeared, and the homogeneous, anoxic water column was dominated by a bloom of gammaproteobacterial sulfur oxidizers related to the GSO/SUP05 clade. This study is the first report of a community shift from phototrophic to chemotrophic sulfide oxidizers as a response to anoxic holomictic conditions in a seasonally stratified seawater lake.

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31

Kushkevych, Ivan, Veronika Bosáková, Monika Vítězová, and Simon K. M. R. Rittmann. "Anoxygenic Photosynthesis in Photolithotrophic Sulfur Bacteria and Their Role in Detoxication of Hydrogen Sulfide." Antioxidants 10, no. 6 (May 22, 2021): 829. http://dx.doi.org/10.3390/antiox10060829.

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Hydrogen sulfide is a toxic compound that can affect various groups of water microorganisms. Photolithotrophic sulfur bacteria including Chromatiaceae and Chlorobiaceae are able to convert inorganic substrate (hydrogen sulfide and carbon dioxide) into organic matter deriving energy from photosynthesis. This process takes place in the absence of molecular oxygen and is referred to as anoxygenic photosynthesis, in which exogenous electron donors are needed. These donors may be reduced sulfur compounds such as hydrogen sulfide. This paper deals with the description of this metabolic process, representatives of the above-mentioned families, and discusses the possibility using anoxygenic phototrophic microorganisms for the detoxification of toxic hydrogen sulfide. Moreover, their general characteristics, morphology, metabolism, and taxonomy are described as well as the conditions for isolation and cultivation of these microorganisms will be presented.

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32

Millach, Laia, Antoni Solé, and Isabel Esteve. "Role ofGeitlerinemasp. DE2011 andScenedesmussp. DE2009 as Bioindicators and Immobilizers of Chromium in a Contaminated Natural Environment." BioMed Research International 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/519769.

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The aim of this work was to study the potential of the two phototrophic microorganisms, both isolated from Ebro Delta microbial mats, to be used as bioindicators and immobilizers of chromium. The results obtained indicated that (i) the Minimum Metal Concentration (MMC) significantly affecting Chlorophyllaintensity inGeitlerinemasp. DE2011 andScenedesmussp. DE2009 was 0.25 µM and 0.75 µM, respectively, these values being lower than those established by current legislation, and (ii)Scenedesmussp. DE2009 was able to immobilize chromium externally in extracellular polymeric substances (EPS) and intracellularly in polyphosphate (PP) inclusions. Additionally, this microorganism maintained high viability, including at 500 µM. Based on these results, we postulate thatGeitlerinemasp. DE2011 andScenedesmussp. DE2009 are good chromium-indicators of cytotoxicity and, further, thatScenedesmussp. DE2009 plays an important role in immobilizing this metal in a contaminated natural environment.

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33

Barsky, E. L., Ya V. Savanina, I. O. Shandieva, A. F. Lebedeva, S. G. Fattakhov, and E. S. Lobakova. "Melafen action on the growth and physiological parameters of phototrophic and heterotrophic microorganisms." Moscow University Biological Sciences Bulletin 64, no. 4 (December 2009): 147–52. http://dx.doi.org/10.3103/s0096392509040038.

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34

Coutinho, M. L., A. Z. Miller, M. A. Rogerio-Candelera, J. Mirão, L. Cerqueira Alves, J. P. Veiga, H. Águas, S. Pereira, A. Lyubchyk, and M. F. Macedo. "An integrated approach for assessing the bioreceptivity of glazed tiles to phototrophic microorganisms." Biofouling 32, no. 3 (February 22, 2016): 243–59. http://dx.doi.org/10.1080/08927014.2015.1135242.

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35

Karsten, U., I. Klimant, and G. Holst. "A new in vivo fluorimetric technique to measure growth of adhering phototrophic microorganisms." Applied and environmental microbiology 62, no. 1 (1996): 237–43. http://dx.doi.org/10.1128/aem.62.1.237-243.1996.

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36

Nowaczyk, Marc M., Hanna C. Grimm, Leen Assil-Companioni, and Robert Kourist. "Cyanobakterien als Biokatalysatoren." BIOspektrum 27, no. 2 (March 2021): 208–10. http://dx.doi.org/10.1007/s12268-021-1527-3.

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AbstractThe highly optimized natural process of oxygenic photosynthesis leads to the formation of redox equivalents, such as NADPH, that can be used to fuel heterologous biotransformations in phototrophic microorganisms. We investigated the reduction of 2-methylmaleimide by the ene-reductase YqjM in the cyanobacterium Synechocystis sp. PCC 6803 and doubled the productivity of the cells by inactivating flavodiironproteins (FDPs) as competing electron sink under self-shading conditions, reaching 18.3 mmol h−1 L−1.

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37

Lyautey, Emilie, Amandine Cournet, Soizic Morin, Stéphanie Boulêtreau, Luc Etcheverry, Jean-Yves Charcosset, François Delmas, Alain Bergel, and Frédéric Garabetian. "Electroactivity of Phototrophic River Biofilms and Constitutive Cultivable Bacteria." Applied and Environmental Microbiology 77, no. 15 (June 3, 2011): 5394–401. http://dx.doi.org/10.1128/aem.00500-11.

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ABSTRACTElectroactivity is a property of microorganisms assembled in biofilms that has been highlighted in a variety of environments. This characteristic was assessed for phototrophic river biofilms at the community scale and at the bacterial population scale. At the community scale, electroactivity was evaluated on stainless steel and copper alloy coupons used both as biofilm colonization supports and as working electrodes. At the population scale, the ability of environmental bacterial strains to catalyze oxygen reduction was assessed by cyclic voltammetry. Our data demonstrate that phototrophic river biofilm development on the electrodes, measured by dry mass and chlorophyllacontent, resulted in significant increases of the recorded potentials, with potentials of up to +120 mV/saturated calomel electrode (SCE) on stainless steel electrodes and +60 mV/SCE on copper electrodes. Thirty-two bacterial strains isolated from natural phototrophic river biofilms were tested by cyclic voltammetry. Twenty-five were able to catalyze oxygen reduction, with shifts of potential ranging from 0.06 to 0.23 V, cathodic peak potentials ranging from −0.36 to −0.76 V/SCE, and peak amplitudes ranging from −9.5 to −19.4 μA. These isolates were diversified phylogenetically (Actinobacteria,Firmicutes,Bacteroidetes, andAlpha-,Beta-, andGammaproteobacteria) and exhibited various phenotypic properties (Gram stain, oxidase, and catalase characteristics). These data suggest that phototrophic river biofilm communities and/or most of their constitutive bacterial populations present the ability to promote electronic exchange with a metallic electrode, supporting the following possibilities: (i) development of electrochemistry-based sensors allowingin situphototrophic river biofilm detection and (ii) production of microbial fuel cell inocula under oligotrophic conditions.

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Pentecost, Allan, Serdar Bayari, and Cahit Yesertener. "Phototrophic microorganisms of the Pamukkale travertine, Turkey: Their distribution and influence on travertine deposition." Geomicrobiology Journal 14, no. 4 (October 1997): 269–83. http://dx.doi.org/10.1080/01490459709378052.

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39

Miller, Ana Zélia, Amélia Dionísio, Leonila Laiz, Maria Filomena Macedo, and Cesareo Saiz-Jimenez. "The influence of inherent properties of building limestones on their bioreceptivity to phototrophic microorganisms." Annals of Microbiology 59, no. 4 (December 2009): 705–13. http://dx.doi.org/10.1007/bf03179212.

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40

Weltzer, Michael L., and Scott R. Miller. "Ecological Divergence of a Novel Group of Chloroflexus Strains along a Geothermal Gradient." Applied and Environmental Microbiology 79, no. 4 (December 21, 2012): 1353–58. http://dx.doi.org/10.1128/aem.02753-12.

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ABSTRACTEnvironmental gradients are expected to promote the diversification and coexistence of ecological specialists adapted to local conditions. Consistent with this view, genera of phototrophic microorganisms in alkaline geothermal systems generally appear to consist of anciently divergent populations which have specialized on different temperature habitats. At White Creek (Lower Geyser Basin, Yellowstone National Park), however, a novel, 16S rRNA-defined lineage of the filamentous anoxygenic phototrophChloroflexus(OTU 10, phylumChloroflexi) occupies a much wider thermal niche than other 16S rRNA-defined groups of phototrophic bacteria. This suggests thatChloroflexusOTU 10 is either an ecological generalist or, alternatively, a group of cryptic thermal specialists which have recently diverged. To distinguish between these alternatives, we first isolated laboratory strains ofChloroflexusOTU 10 from along the White Creek temperature gradient. These strains are identical for partial gene sequences encoding the 16S rRNA and malonyl coenzyme A (CoA) reductase. However, strains isolated from upstream and downstream samples could be distinguished based on sequence variation atpcs, which encodes the propionyl-CoA synthase of the 3-hydroxypropionate pathway of carbon fixation used by the genusChloroflexus. We next demonstrated that strains have diverged in temperature range for growth. Specifically, we obtained evidence for a positive correlation between thermal niche breadth and temperature optimum, with strains isolated from lower temperatures exhibiting greater thermal specialization than the most thermotolerant strain. The study has implications for our understanding of both the process of niche diversification of microorganisms and how diversity is organized in these hot spring communities.

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Safonova, Elena, and Swetlana König. "NOVEL OIL-DEGRADING ALGAL-BACTERIAL ASSOCIATIONS FOR THE TREATMENT OF OIL POLUTION IN THE BALTIC SEA." International Oil Spill Conference Proceedings 2014, no. 1 (May 1, 2014): 300185. http://dx.doi.org/10.7901/2169-3358-2014-1-300185.1.

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The stability of an ecosystem strongly depends on the biodiversity of its microorganisms population. The network of interactions between microorganisms provides a flexible response to various changes of the coenotic equilibrium. This equilibrium changes drastically if such a network is damaged by oil spills or any other kind of pollution, representing a danger to the existence of a whole ecosystem. Bioremediation is a method employing microorganisms to remove pollutants and to restore the ecology of populations. Understandably due to its nature, this approach is considered to be the most gentle and safe one what makes it very attractive. Our focus was to improve the efficiency of the treatment of oil pollution in the Baltic Sea. As a part of “BioBind” project, we aimed to create artificial associations of alkanotrophic bacteria and phototrophic partners (algae or cyanobacteria) and to use them as an effective tool for the removal of oil spills. In summer and winter 2011–2012, we isolated 157 strains of both algae and cyanobacteria and 199 bacteria. The samples were taken from four different places of the Baltic Sea in the areas of Rostock, St. Petersburg, Kiel and Sassnitz. After the screening, we have selected 19 strains of alkanotrophyc bacteria and 23 strains of green algae and cyanobacteria showing resistance to the pollutants. The screening was performed in media containing an oil, phenol and phenanthrene at low temperatures (4°C and 10°C) and different salt concentrations. All selected species of bacteria belonged to the genus Rhodococcus. Further selection was aimed at finding combinations of bacterial strains which show an increased degrading capacity and exceeding the one of the originally isolated microorganisms. As a result, we have selected associations with the degradation of crude oil (at the concentration of 2 g/L) with a degradation rate from 25% up to 35%. Furthermore, we have discovered that the presence of the phototrophic microorganisms in these associations resulted to a positive modest effect with regard to the efficiency of the system by several percent. Our result proves clearly the concept that bioremediation represents an effective mean to clean up oil spills. This is remarkable that the system also shows plasticity and can be improved by creating different variations of the microorganisms constituting it. Thus bioremedation provides scope for further development. The selected artificial associations can be recommended for the purification of oil pollution in the Baltic Sea.

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Tóth, E., M. Toumi, R. Farkas, K. Takáts, Cs Somodi, and É. Ács. "Insight into the hidden bacterial diversity of Lake Balaton, Hungary." Biologia Futura 71, no. 4 (September 7, 2020): 383–91. http://dx.doi.org/10.1007/s42977-020-00040-6.

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AbstractIn the present study, the prokaryotic community structure of the water of Lake Balaton was investigated at the littoral region of three different points (Tihany, Balatonmáriafürdő and Keszthely) by cultivation independent methods [next-generation sequencing (NGS), specific PCRs and microscopy cell counting] to check the hidden microbial diversity of the lake. The taxon-specific PCRs did not show pathogenic bacteria but at Keszthely and Máriafürdő sites extended spectrum beta-lactamase-producing microorganisms could be detected. The bacterial as well as archaeal diversity of the water was high even when many taxa are still uncultivable. Based on NGS, the bacterial communities were dominated by Proteobacteria, Bacteroidetes and Actinobacteria, while the most frequent Archaea belonged to Woesearchaeia (Nanoarchaeota). The ratio of the detected taxa differed among the samples. Three different types of phototrophic groups appeared: Cyanobacteria (oxygenic phototrophic organisms), Chloroflexi (anaerobic, organotrophic bacteria) and the aerobic, anoxic photoheterotrophic group (AAPs). Members of Firmicutes appeared only with low abundance, and Enterobacteriales (order within Proteobacteria) were present also only in low numbers in all samples.

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Vázquez-Nion, Daniel, Elsa Fuentes, and Beatriz Prieto. "Effect of Inorganic Carbon Concentration on the Development of Subaerial Phototrophic Biofilms on Granite." Coatings 10, no. 11 (October 29, 2020): 1049. http://dx.doi.org/10.3390/coatings10111049.

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Organisms living at the stone–air interface are expected to be affected by changes in the atmospheric composition due to greenhouse gases emissions. Increased CO2 concentrations may particularly affect phototrophic microorganisms that colonize stone cultural heritage and form subaerial biofilms. However, little is known about the effects of the environmental changes on microorganisms that colonize stone and the consequences for cultural heritage conservation. In the present study, we investigated how an increase in inorganic carbon concentration affected the development of a subaerial biofilm composed by the cyanobacterium Synechocystis sp. PCC 6803 grown on granite. For this purpose, we established two experiments on biofilm formation, with and without addition of inorganic carbon to the growth medium. Higher concentrations of carbon promoted biofilm growth and increased the concentrations of the photosynthetic pigments chlorophyll a and carotenoids on granite surface, potentially exacerbating the aesthetic impact of these biofilms on stone-made cultural heritage. However, the extracellular polysaccharides produced were not significantly affected by carbon availability, so that physical stone biodeterioration might not be increased by the cyanobacterial matrix. The findings provide valuable data on how the existing global change scenario might affect organisms inhabiting stone cultural heritage and encourage to develop new sustainable treatments and methodologies to prevent biodeterioration and thus preserve stone cultural heritage.

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Popovic, Sladjana, Kristina Petrovic, Dusica Trnavac-Bogdanovic, Dragana Milosevic, Ana Graovac, Ivana Trbojevic, and Gordana Subakov-Simic. "Cyanobacteria and algae from biofilm at the entrance zone of Petnica Cave." Zbornik Matice srpske za prirodne nauke, no. 140 (2021): 71–84. http://dx.doi.org/10.2298/zmspn2140071p.

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The importance of biofilms in caves, the diversity of microorganisms in them, their mutual relationship and relationship with the substratum are among the advancing research topics in microbial biospeleology. This research is making contribution to the knowledge about biofilms at cave entrances and phototrophic communities in them. In that manner, biofilms from the entrance zone of the Petnica Cave were examined. Light microscopy showed that cyanobacteria were exclusively dominant phototrophs (34 taxa out of 39 total taxa recorded) with coccoid forms prevailing (28 taxa); simple trichal forms were present to a lesser extent, while heterocytous ones were completely absent. Genera Gloeocapsa, Chroococcus,Gloeothece and Leptolyngbya were the most diverse. Four green algal genera characteristic for aerophytic habitats (Apatococcus, Desmococcus, Haematococcus and Trentepohlia) were also recorded, while Bacillariophytawere observed sporadically. Three groups of sampling sites were distinguished based on recorded taxa, their richness and similarity, using non-metric multidimensional scaling (NMDS). Quantitative biofilm characteristics were also assessed - the content of chlorophyll a (Chl a) was determined, as well as the contents of water, organic and inorganic matter. Chl a had a significant positive correlation with the content of organic matter (r=0.904, P=0.013).

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Gorin, K., D. Kolomoitsev, A. Melnikova, and Y. Sergeeva. "Possibilities of municipal waste water treatment by using phototrophic microorganisms under the Moscow climate conditions." IOP Conference Series: Earth and Environmental Science 337 (November 16, 2019): 012001. http://dx.doi.org/10.1088/1755-1315/337/1/012001.

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Tanvir, Rahamat Ullah, Jianying Zhang, Timothy Canter, Dick Chen, Jingrang Lu, and Zhiqiang Hu. "Harnessing solar energy using phototrophic microorganisms: A sustainable pathway to bioenergy, biomaterials, and environmental solutions." Renewable and Sustainable Energy Reviews 146 (August 2021): 111181. http://dx.doi.org/10.1016/j.rser.2021.111181.

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SOARES, FABIANA, IGOR TIAGO, JOÃO TROVÃO, CATARINA COELHO, NUNO MESQUITA, FRANCISCO GIL, LÍDIA CATARINO, SUSANA M. CARDOSO, and ANTÓNIO PORTUGAL. "Description of Myxacorys almedinensis sp. nov. (Synechococcales, Cyanobacteria) isolated from the limestone walls of the Old Cathedral of Coimbra, Portugal (UNESCO World Heritage Site)." Phytotaxa 419, no. 1 (September 30, 2019): 77–90. http://dx.doi.org/10.11646/phytotaxa.419.1.5.

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Cyanobacteria are photoautotrophic microorganisms able to colonize historic stone monuments, causing severe aesthetic, physical and chemical alterations to the substrate. In a study that aimed to fingerprint the phototrophic community of the biodeteriorated walls of the Old Cathedral of Coimbra (UNESCO World Heritage Site), an unknown Myxacorys-like cyanobacterium was isolated. In this paper, we employed a polyphasic approach based on morphological, ecological and phylogenetic analyses of the partial 16S and the whole 16S-23S ITS rRNA regions. The resulting analyses allowed us to propose the description of a new species, Myxacorys almedinensis sp. nov. within the genus Myxacorys.

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Beisser, Daniela, Nadine Graupner, Christina Bock, Sabina Wodniok, Lars Grossmann, Matthijs Vos, Bernd Sures, Sven Rahmann, and Jens Boenigk. "Comprehensive transcriptome analysis provides new insights into nutritional strategies and phylogenetic relationships of chrysophytes." PeerJ 5 (January 10, 2017): e2832. http://dx.doi.org/10.7717/peerj.2832.

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BackgroundChrysophytes are protist model species in ecology and ecophysiology and important grazers of bacteria-sized microorganisms and primary producers. However, they have not yet been investigated in detail at the molecular level, and no genomic and only little transcriptomic information is available. Chrysophytes exhibit different trophic modes: while phototrophic chrysophytes perform only photosynthesis, mixotrophs can gain carbon from bacterial food as well as from photosynthesis, and heterotrophs solely feed on bacteria-sized microorganisms. Recent phylogenies and megasystematics demonstrate an immense complexity of eukaryotic diversity with numerous transitions between phototrophic and heterotrophic organisms. The question we aim to answer is how the diverse nutritional strategies, accompanied or brought about by a reduction of the plasmid and size reduction in heterotrophic strains, affect physiology and molecular processes.ResultsWe sequenced the mRNA of 18 chrysophyte strains on the Illumina HiSeq platform and analysed the transcriptomes to determine relations between the trophic mode (mixotrophic vs. heterotrophic) and gene expression. We observed an enrichment of genes for photosynthesis, porphyrin and chlorophyll metabolism for phototrophic and mixotrophic strains that can perform photosynthesis. Genes involved in nutrient absorption, environmental information processing and various transporters (e.g., monosaccharide, peptide, lipid transporters) were present or highly expressed only in heterotrophic strains that have to sense, digest and absorb bacterial food. We furthermore present a transcriptome-based alignment-free phylogeny construction approach using transcripts assembled from short reads to determine the evolutionary relationships between the strains and the possible influence of nutritional strategies on the reconstructed phylogeny. We discuss the resulting phylogenies in comparison to those from established approaches based on ribosomal RNA and orthologous genes. Finally, we make functionally annotated reference transcriptomes of each strain available to the community, significantly enhancing publicly available data on Chrysophyceae.ConclusionsOur study is the first comprehensive transcriptomic characterisation of a diverse set of Chrysophyceaen strains. In addition, we showcase the possibility of inferring phylogenies from assembled transcriptomes using an alignment-free approach. The raw and functionally annotated data we provide will prove beneficial for further examination of the diversity within this taxon. Our molecular characterisation of different trophic modes presents a first such example.

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Akmukhanova, N. R., B. K. Zayadan, M. O. Bauyenova, A. K. Sadvakasova, K. Bolatkhan, and S. Seilbek. "Formation of structured biocenoses of higher aquatic plants and phototrophic microorganisms for application in wastewater treatment." Eurasian Journal of Ecology 3, no. 52 (2017): 46–53. http://dx.doi.org/10.26577/eje-2017-3-780.

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Xiao, Li, and Zhen He. "Applications and perspectives of phototrophic microorganisms for electricity generation from organic compounds in microbial fuel cells." Renewable and Sustainable Energy Reviews 37 (September 2014): 550–59. http://dx.doi.org/10.1016/j.rser.2014.05.066.

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