Gotowe bibliografie tematyczne / Bacterial diversity

Gotowa bibliografia na temat „Bacterial diversity”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 20 lutego 2023

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Artykuły w czasopismach na temat "Bacterial diversity"

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Han, J., L. Y. Wang i B. Y. Cai. "Bacterial diversity in antibiotic wastewater treatment". Water Science and Technology 68, nr 12 (24.10.2013): 2676–82. http://dx.doi.org/10.2166/wst.2013.529.

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The bacterial diversity of an antibiotic industrial wastewater treatment system was analyzed to provide the information required for further optimization of this process and for identification of bacterial strains that perform improved degradation of antibiotic industrial wastewater. The total bacterial DNA of samples collected at three stages (aeration, precipitation, and idle) during the sequencing batch reactor (SBR) process were analyzed by polymerase chain reaction–denaturing gradient gel electrophoresis (PCR-DGGE) of the 16 s rDNA V3 regions. Community analysis was conducted in terms of the richness value (S), the dominance degree and the Shannon–Wiener diversity index (H). Rich bacterial diversity was apparent in the aeration stage of the SBR process, and the number of bands in the aeration stage was more abundant than that in the precipitation and idle stages. The DGGE analysis showed 15 bands, six of which were uncultured bacteria, and included one anaerobic and five aerobic bacteria. The microbial community in the aeration stage was the most complex of the whole SBR process, while the dominant bacteria differed in each reaction stage. These results demonstrate the cyclical dynamic changes in the bacterial population during the SBR process for the treatment of antibiotic industrial wastewater.
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López-Lara, Isabel M., i Otto Geiger. "Bacterial lipid diversity". Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids 1862, nr 11 (listopad 2017): 1287–99. http://dx.doi.org/10.1016/j.bbalip.2016.10.007.

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He, Yuanhao, Xiaojun Deng i Feng Che. "Genetic diversity and community structure of soil bacteria in Chinese fir plantations". Soil and Water Research 14, No. 1 (23.01.2019): 22–31. http://dx.doi.org/10.17221/10/2018-swr.

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To explore the diversity of soil bacteria and changes in the bacterial community structure of Chinese fir plantations of different generations and developmental stages, the genetic diversity of soil bacteria was studied using the 454 sequencing technology. The results showed that the bacterial genetic diversity and community structure of Chinese fir plantation plots under monoculture planting and rotation planting practices were as follows: the Shannon diversity indices of first-generation young plantation of Chinese fir plantations (FYC), second-generation young plantation (SYC), and third-generation young plantation (TYC) initially decreased and then increased to 8.45, 8.1, and 8.43, respectively. Due to different management and tending measures, the phyla showing considerable differences in relative abundance were Cyanobacteria, Nitrospirae, Fibrobacteres, Thermotogae, and Planctomycetes. The bacterial genetic diversity and community structure of Chinese fir plantations at different developmental stages were as follows: the bacterial diversity and the number of operational taxonomic units (OTUs) decreased with increasing forest age; with the increasing forest age of Chinese fir, the bacteria with considerable differences in the relative abundance were Burkholderiales, Xanthomonadales, Ktedonobacteria, Nitrosomonadales, Anaerolineae, and Holophagae. The predominant bacteria of the Chinese fir plantations were Acidothermus, Bradyrhizobium, Lactococcus, Planctomyces, Sorangium, and Bryobacter.
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Chiba, Akane, Yoshitaka Uchida, Susanne Kublik, Gisle Vestergaard, Franz Buegger, Michael Schloter i Stefanie Schulz. "Soil Bacterial Diversity Is Positively Correlated with Decomposition Rates during Early Phases of Maize Litter Decomposition". Microorganisms 9, nr 2 (11.02.2021): 357. http://dx.doi.org/10.3390/microorganisms9020357.

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This study aimed to investigate the effects of different levels of soil- and plant-associated bacterial diversity on the rates of litter decomposition, and bacterial community dynamics during its early phases. We performed an incubation experiment where soil bacterial diversity (but not abundance) was manipulated by autoclaving and reinoculation. Natural or autoclaved maize leaves were applied to the soils and incubated for 6 weeks. Bacterial diversity was assessed before and during litter decomposition using 16S rRNA gene metabarcoding. We found a positive correlation between litter decomposition rates and soil bacterial diversity. The soil with the highest bacterial diversity was dominated by oligotrophic bacteria including Acidobacteria, Nitrospiraceae, and Gaiellaceae, and its community composition did not change during the incubation. In the less diverse soils, those taxa were absent but were replaced by copiotrophic bacteria, such as Caulobacteraceae and Beijerinckiaceae, until the end of the incubation period. SourceTracker analysis revealed that litter-associated bacteria, such as Beijerinckiaceae, only became part of the bacterial communities in the less diverse soils. This suggests a pivotal role of oligotrophic bacteria during the early phases of litter decomposition and the predominance of copiotrophic bacteria at low diversity.
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Mushegian, Alexandra A., Celeste N. Peterson, Christopher C. M. Baker i Anne Pringle. "Bacterial Diversity across Individual Lichens". Applied and Environmental Microbiology 77, nr 12 (29.04.2011): 4249–52. http://dx.doi.org/10.1128/aem.02850-10.

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ABSTRACTSymbioses are unique habitats for bacteria. We surveyed the spatial diversity of bacterial communities across multiple individuals of closely related lichens using terminal restriction fragment length polymorphism (T-RFLP) and pyrosequencing. Centers of lichens house richer, more consistent assemblages than species-poor and compositionally disparate lichen edges, suggesting that ecological succession plays a role in structuring these communities.
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Godon, Jean-Jacques, Emmanuelle Zumstein, Patrick Dabert, Frédéric Habouzit i René Moletta. "Microbial 16S rDNA diversity in an anaerobic digester". Water Science and Technology 36, nr 6-7 (1.09.1997): 49–55. http://dx.doi.org/10.2166/wst.1997.0574.

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The bacterial community structure of a fluidized bed reactor fed by vinasses was analysed by molecular identification. After PCR amplification, three 16S rDNA clone libraries of Bacteria, Archaea, and Procarya populations were established. Community structure was determined by phylogenetic analysis of 556 partial rDNA sequences (about 500 bp long). 139 OTUs (Operational Taxonomic Unit) were found among which 133 and 6 were from the Bacteria and Archaea domains respectively. The majority of bacterial OTUs are not closely related to all other hitherto-determined sequences. The ratio Archaea/Bacteria is 1/4 and the most frequent bacterial OTU represents less than 5% of the characterised bacterial population.
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Chin, Lai Mun, i Vui Ling Clemente Michael Wong. "Tropical Soil Bacterial Diversity in Sabah, Malaysia". Sains Malaysiana 51, nr 2 (28.02.2022): 451–60. http://dx.doi.org/10.17576/jsm-2022-5102-10.

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Bacteria are an essential biological component of soil function that plays fundamental roles in biogeochemical cycling, soil quality improvement, habitat-shaping, and ecosystem conservation. It is therefore important to have a good record of soil bacteria in the tropics in order to monitor future changes that may occur due to global warming and other factors. However, extremely limited data are available on the diversity of bacteria in soils in some tropical Borneo regions such as Sabah, Malaysia. This research, therefore, was undertaken to determine the bacterial diversity of soils from various locations in Sabah, Malaysia. Ten soil samples (n=10) were collected around Sabah. 16S rDNA of bacterial DNA extracted from soils were amplified and analysed using the Denaturing Gradient Gel Electrophoresis (DGGE). A total of 100 dominant and well-defined DNA fragments observed in the DGGE gel were extracted, sequenced, and aligned. The results indicated that 93 different bacterial operational taxonomic units (OTUs) representing bacteria from 8 different phyla were present. The most abundant phyla in the analysed Sabah soils were Proteobacteria followed by Acidobacteria, Firmicutes, Actinobacteria, Planctomycetes, Verrucomicrobia, Chloroflexi, and Bacteroidetes. The examined soils of Sabah and Peninsular Malaysia had similar dominant phyla in general, except that the most dominant phylum in Peninsular Malaysia soils is the Acidobacteria instead of Proteobacteria. These baseline data generated from this work are important and can be used to track bacterial diversity shifts due to soil or environmental changes in the future.
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Haynes, S., A. C. Darby, T. J. Daniell, G. Webster, F. J. F. van Veen, H. C. J. Godfray, J. I. Prosser i A. E. Douglas. "Diversity of Bacteria Associated with Natural Aphid Populations". Applied and Environmental Microbiology 69, nr 12 (grudzień 2003): 7216–23. http://dx.doi.org/10.1128/aem.69.12.7216-7223.2003.

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ABSTRACT The bacterial communities of aphids were investigated by terminal restriction fragment length polymorphism and denaturing gradient gel electrophoresis analysis of 16S rRNA gene fragments generated by PCR with general eubacterial primers. By both methods, theγ -proteobacterium Buchnera was detected in laboratory cultures of six parthenogenetic lines of the pea aphid Acyrthosiphon pisum and one line of the black bean aphid Aphis fabae, and one or more of four previously described bacterial taxa were also detected in all aphid lines except one of A. pisum. These latter bacteria, collectively known as secondary symbionts or accessory bacteria, comprised three taxa of γ-proteobacteria (R-type [PASS], T-type [PABS], and U-type [PAUS]) and a rickettsia (S-type [PAR]). Complementary analysis of aphids from natural populations of four aphid species (A. pisum [n= 74], Amphorophora rubi [n= 109], Aphis sarothamni [n= 42], and Microlophium carnosum [n= 101]) from a single geographical location revealed Buchnera and up to three taxa of accessory bacteria, but no other bacterial taxa, in each aphid. The prevalence of accessory bacterial taxa varied significantly among aphid species but not with the sampling month (between June and August 2000). These results indicate that the accessory bacterial taxa are distributed across multiple aphid species, although with variable prevalence, and that laboratory culture does not generally result in a shift in the bacterial community in aphids. Both the transmission patterns of the accessory bacteria between individual aphids and their impact on aphid fitness are suggested to influence the prevalence of accessory bacterial taxa in natural aphid populations.
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Kennedy, A. C. "Bacterial diversity in agroecosystems". Agriculture, Ecosystems & Environment 74, nr 1-3 (czerwiec 1999): 65–76. http://dx.doi.org/10.1016/s0167-8809(99)00030-4.

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Beckwith, Jon. "Genetics of bacterial diversity". Trends in Genetics 5 (1989): 348. http://dx.doi.org/10.1016/0168-9525(89)90141-8.

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Rozprawy doktorskie na temat "Bacterial diversity"

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Lozupone, Catherine Anne. "Global patterns of bacterial diversity". Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3273707.

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Powell, James Patrick. "Antibiotic Diversity and Bacterial Resistance". Available to users online at:, 2007. http://hdl.handle.net/10156/1303.

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Giaramida, Luca. "Freshwater bacterial diversity, functions and stability". Thesis, Robert Gordon University, 2013. http://hdl.handle.net/10059/843.

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Biodiversity is declining worldwide with detrimental effects on ecosystems functions and services that it sustains. The relationship between biodiversity and freshwater purification remains unclear. Freshwater purification is of paramount importance for humankind as eighty percent of the world’s population is exposed to high levels of threat in terms of water security. Bacteria are the most diverse and abundant organisms on Earth and they play, directly or indirectly, a key role in the majority of ecosystem services including water purification. The current work aimed, in freshwater systems, to unravel the relationships between microbial diversity and: (a) biodegradation of toxic compounds (i.e. specialised function); (b) respiration (i.e. broad function) and; (c) stability of broad functioning. Firstly, preliminary experiments were carried out to establish freshwater sample size to representatively evaluate bacterial communities’ diversity and also suitable natural and man-made toxic compounds for freshwater incubation experiments. Then, the microbial communities’ ability to degrade microcystin-LR was explored in the context of previous exposures and nutrient availability. Finally, we focused on the relationships between diversity and functioning. A decrease in microbial diversity caused a decrease in both broad and specialised ecosystem functions tested. Stability of broad functioning was also negatively affected by a decrease in microbial diversity. Both lakes (Scotland) and rivers (Australia) microcosms experiments resulted in comparable findings suggesting consistent relationships across different freshwater systems. These results highlight that, similarly to macro-organisms (plant and animals), declining diversity of the microbial communities has direct consequences for important ecosystem functioning and services and therefore, microbial diversity should be explicitly considered in all biodiversity conservation debates.
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Cotton, Andrew W. "Biochemical diversity of some bacterial haloalcohol dehalogenases". Thesis, University of Kent, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365223.

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Hunt, Dana E. Ph D. Massachusetts Institute of Technology. "Aquatic microenvironments in bacterial ecology and diversity". Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43047.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2008.
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Includes bibliographical references.
Molecular surveys have revealed tremendous bacterial diversity in the world's oceans; yet how do these diverse bacteria with the same essential nutrient requirements co-exist in the same environment? This study examines the role of aquatic microenvironments in generating bacterial diversity: closely related organisms may co-exist in the same environment without competing for resources by a combination of habitat, metabolic, and behavioral differentiation. This hypothesis has been approached from several angles: (i) Within the bacterial family Vibrionaceae is there evidence for microenvironmental specialization or functional differentiation? (ii) Is there small scale clustering of bacteria around phytoplankton in the coastal ocean? Microdiverse clusters (< 1% 16S rRNA gene divergence) of Vibrionaceae were found to be differentially distributed between zooplankton-enriched, particulate, and planktonic water column microenvironments. However microhabitat preferences may not correspond to metabolic capabilities; chitin metabolism was observed to be a near ubiquitous metabolic characteristic of the Vibrionaceae, yet does not appear to be linked to colonization of chitinous zooplankton or particles. Finally, the microscale patchiness of bacterial cells was examined over an annual cycle, revealing seasonal variation and a positive correlation with eukaryotic cell number, suggesting that bacteria may cluster in the nutrient-rich microzones around algae in the environment. This study seeks to answer several fundamental questions about marine bacterial populations: how do closely related species co-exist in the same environment, do bacteria adapt to distinct microscale environments and how important are these microenvironments to bacterial productivity.
by Dana E. Hunt..
Ph.D.
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Stuck, Robert Jason. "THE INFLUENCE OF PHYTOREMEDIATION ON BACTERIAL DIVERSITY". Miami University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=miami1133398530.

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Dixit, Sameer M. "Antagonistic activity of probiotic bacteria based on bacterial diversity in the porcine gut". Thesis, View thesis, 2004. http://handle.uws.edu.au:8081/1959.7/35614.

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Diversity analysis of Escherichia coli have routinely utilised isolates obtained by culture of faeces on MacConkey selective media, under the assumption that the diversity identified in faecal isolates are representative of similar diversity in E. coli in the gastrointestinal tract (GIT). This study has addressed this important issue by specifically isolating E. coli from different regions of the gut in pigs and subjecting them to enzymatic multilocus enzyme electrophoresis (MLEE) and molecular virulence factor (VF) analysis to ascertain whether E. coli populations inhabiting different regions of the gut are different from each other. Combination of these results showed that on average, E. coli strains isolated from the upper GIT region (small intestine) of the pig are distinctly different from the E. coli strains isolated from the lower GIT region (large intestine). An important aspect of the finding that faecal E. coli are not truly representative of the diversity in the GIT is the mechanism used by specific clonotypes that have adapted to different geographical habitats to survive challenge from incoming strains.
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Dixit, Sameer M. "Antagonistic activity of probiotic bacteria based on bacterial diversity in the porcine gut". View thesis, 2004. http://handle.uws.edu.au:8081/1959.7/35614.

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Thesis (Ph.D.)--University of Western Sydney, Hawkesbury, 2004.
A thesis presented to the University of Western Sydney, Hawkesbury, Centre for Advanced Food Research, in fulfilment of the requirements for the degree of Doctor of Philosophy. Includes bibliographies.
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Bayindirli, Cansu. "Environmental influences on marine bacterial diversity and activity". Thesis, University of East Anglia, 2016. https://ueaeprints.uea.ac.uk/59617/.

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In order to facilitate the conservation of biological diversity, a comprehensive knowledge of the microbial ecology of an ecosystem is required. As the vast majority of microbes are not readily culturable, it is necessary to use molecular tools to investigate their diversity and function in the marine ecosystem. Although it provides a vast quantity of data, the information obtained by molecular tools alone is not sufficient to understand the drivers behind the changes in bacterial communities. This study aims to characterize changes in the diversity and activity of the heterotrophic bacterial community in relation to a changing environment, in time and space. Two different sampling strategies were used in order to achieve this goal; an annual time series study at a coastal station (station L4, Western English Channel Observatory (WECO)) and a Lagrangian study following an upwelling plume on its track to off shore (2nd filament, Surface Ocean-Lower Atmosphere Study (SOLAS) - Impact of coastal upwelling on the air-sea exchange of climatically important gases (ICON) cruise). Surface water samples were collected from the time series station L4 of the Western Channel Observatory (50º15'N, 04º13'W; www.westernchannelobservatory.org) every week between 6th April 2009 and 26th April 2010. The respiration rate of the heterotrophic community was determined using Winkler titration to measure the dissolved oxygen content of the < 0.8 μm size-fraction of the seawater. This dataset sits within the larger framework of the Western English Channel bacterial diversity ABSTRACT 2 time series (2003-2009) and the seasonal metagenomic and metatranscriptomic studies associated with this site. The second approach was to investigate the bacterial diversity and activity in a dynamic environment, such as an upwelling region. The upwelling region off the coast of Mauritania is one of the most productive areas of the world ocean, yet little is known of the temporal and spatial variability in prokaryotic community structure and metabolic activity there, and crucially how this contributes to global elemental cycles. During a Natural Environmental Research Council (NERC) SOLAS-funded Lagrangian study, we determined bacterial community structure and production together with total community respiration and production. This part of the study describes the temporal changes in bacterial community structure and its activity, in relation to the complex upwelling environmental conditions (mixing, chlorophyll, dissolved organic and inorganic nutrients). Turbulence and dissolved organic carbon appear to play an important role.
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Lu, Ting. "Bacterial diversity as a biomarker of soil health". University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1283192368.

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Książki na temat "Bacterial diversity"

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A, Hopwood D., i Chater K. F, red. Genetics of bacterial diversity. London: Academic Press, 1989.

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Priest, Fergus G., Alberto Ramos-Cormenzana i B. J. Tindall, red. Bacterial Diversity and Systematics. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-1869-3.

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Klepac-Ceraj, Vanja. Diversity and phylogenetic structure of two complex marine microbial communities. Ft. Belvoir: Defense Technical Information Center, 2004.

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International Symposium on the Microbial Diversity in Time and Space (1994 Tokyo, Japan). Microbial diversity in time and space. New York: Plenum Press, 1996.

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Edlund, Anna. Microbial diversity in Baltic Sea sediments. Uppsala: Swedish University of Agricultural Sciences, 2007.

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Takami, Hideto. Genomic diversity of Bacillus-related species. New York: Nova Science, 2008.

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Maheshwari, Dinesh K., red. Bacterial Diversity in Sustainable Agriculture. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05936-5.

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International Conference Microbial Diversity : current situation, conservation strategy, and ecological aspects (1996 Perm, Russia). Mezhdunarodnai͡a︡ konferent͡s︡ii͡a︡ Mikrobnoe raznoobrazie: Sostoi͡a︡nie, strategii͡a︡ sokhranenii͡a︡, ėkologicheskie problemy : tezisy dokladov : 8-11 okti͡a︡bri͡a︡ 1996 g., Permʹ, Rossii͡a︡. [Permʹ]: Uralʹskoe otd-nie Rossiĭskoĭ akademii nauk, In-t ėkologii i genetiki mikroorganizmov, 1996.

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Bacterial biofilms. Berlin: Springer, 2008.

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T, Staley James, i Reysenbach Anna-Louise, red. Biodiversity of microbial life: Foundation of Earth's biosphere. New York: Wiley, 2002.

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Części książek na temat "Bacterial diversity"

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Gottschalk, Gerhard. "Metabolic Diversity of Aerobic Heterotrophs". W Bacterial Metabolism, 104–40. New York, NY: Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4612-1072-6_5.

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Cash, Phillip. "Bacterial Proteomics". W Microbial Diversity and Bioprospecting, 260–79. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555817770.ch26.

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Jones, Brian E., William D. Grant, Nadine C. Collins i Wanjiru E. Mwatha. "Alkaliphiles: Diversity and Identification". W Bacterial Diversity and Systematics, 195–230. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-1869-3_12.

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Fegan, M. "Chair’s Perspective: Diversity of Ralstonia solanacearum". W Bacterial Wilt Disease, 17–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-662-03592-4_3.

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Galperin, Michael Y. "Genome Diversity of Spore-Forming Firmicutes". W The Bacterial Spore, 1–18. Washington, DC, USA: ASM Press, 2016. http://dx.doi.org/10.1128/9781555819323.ch1.

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Staley, James T. "Speciation and Bacterial Phylospecies". W Microbial Diversity and Bioprospecting, 40–48. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555817770.ch4.

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Schleifer, Karl-Heinz, i Wolfgang Ludwig. "Molecular Taxonomy: Classification and Identification". W Bacterial Diversity and Systematics, 1–15. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-1869-3_1.

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de Macario, Everly Conway, i Alberto J. L. Macario. "Diversity, Dynamics and Topographic Arrangement of Microorganisms are Essential Parameters that Identify a microbial Consortium". W Bacterial Diversity and Systematics, 161–71. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-1869-3_10.

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da Costa, Milton S., i M. Fernanda Nobre. "Chemotaxonomy and the Identification of Thermophilic Bacteria". W Bacterial Diversity and Systematics, 173–93. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-1869-3_11.

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Ventosa, Antonio. "Taxonomy and Phylogeny of Moderately Halophilic Bacteria". W Bacterial Diversity and Systematics, 231–42. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-1869-3_13.

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Streszczenia konferencji na temat "Bacterial diversity"

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Zhao, Zhao, Michael Gonsior, Philippe Schmitt-Kopplin, Yuanchao Zhan, Rui Zhang, Nianzhi Jiao i Feng Chen. "Coupling of Bacterial Diversity and Dissolved Organic Matter Chemodiversity". W Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.3175.

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Amran, Afzufira, Mohd Sanusi Jangi, Wan Syaidatul Aqma, Nurul Yuziana Mohd Yusof, Mohd Faizal Abu Bakar i Mohd Noor Mat Isa. "Bacterial diversity of oil palm Elaeis guineensis basal stems". W THE 2016 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2016 Postgraduate Colloquium. Author(s), 2016. http://dx.doi.org/10.1063/1.4966734.

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Chaudhry, Zahra, Joshua L. Santarpia i J. V. Martins. "Characteristics of phylogenetic diversity in airborne bacterial populations in China". W SPIE Defense, Security, and Sensing. SPIE, 2011. http://dx.doi.org/10.1117/12.887204.

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Abdel Samad, Rim, Zulfa Al Disi, Mohammad Ashfaq i Nabil Zouari. "The use of Principle Component Analysis and MALDI-TOF MS for the differentiation of mineral forming Virgibacillus and Bacillus species isolated from Sabkhas". W Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0069.

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Occurrence of mineral forming and other bacteria in mats is well demonstrated. However, their high diversity shown by ribotyping was not explained, although it could explain the diversity of formed minerals. Common biomarkers as well as phylogenic relationships are useful tools to clustering the isolates and predict their potential role in the natural niche. In this study, combination of MALDI-TOF MS with PCA was shown a powerful tool to categorize 35 mineral forming bacterial strains isolated from Dohat Fshaikh sabkha, at northwest of Qatar (23 from decaying mats and 12 from living ones). 23 strains from decaying mats belong to Virgibacillus genus as identified by ribotyping and are shown highly involved in formation of protodolomite and a diversity of minerals. They were used as internal references in categorization of sabkha bacteria. Combination of isolation of bacteria on selective mineral forming media, their MALDI TOF MS protein profiling and PCA analysis established their relationship in a phyloproteomic based on protein biomarkers including m/z 4905, 3265, 5240, 6430, 7765, and 9815. PCA analysis clustered the studied strains into 3 major clusters, showing strong correspondence to the 3 phyloproteiomic groups that were established by the dendrogram. Both clustering analysis means have evidently demonstrated a relationship between known Virgibacillus strains and other related bacteria based on profiling of their synthesized proteins. Thus, larger populations of bacteria in mats can be easily screened for their potential to exhibit certain activities, which is of ecological, environmental and biotechnological significance.
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Ottaviani, Romina, i Maria Eugenia Llames. "The Bacterial Community and Its Shaping Mechanisms". W The 2nd International Electronic Conference on Diversity (IECD 2022)—New Insights into the Biodiversity of Plants, Animals and Microbes. Basel Switzerland: MDPI, 2022. http://dx.doi.org/10.3390/iecd2022-12357.

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Mojib, Nazia, Jonathan Huang, Richard B. Hoover, Elena V. Pikuta, Michael Storrie-Lombardi, Birgit Sattler, Dale Andersen i Asim K. Bej. "Diversity of bacterial communities in the lakes of Schirmacher Oasis, Antarctica". W SPIE Optical Engineering + Applications, redaktorzy Richard B. Hoover, Gilbert V. Levin, Alexei Y. Rozanov i Kurt D. Retherford. SPIE, 2009. http://dx.doi.org/10.1117/12.831289.

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Taopan, Rizki, Iman Rusmana i Dwi Santosa. "Bacterial Diversity on the Application of Methanotrophic Bacteria in Rainfed Rice of Kupang Regency, East Nusa Tenggara, Indonesia". W Proceedings of the 1st International Conference on Education, Humanities, Health and Agriculture, ICEHHA 2021, 3-4 June 2021, Ruteng, Flores, Indonesia. EAI, 2021. http://dx.doi.org/10.4108/eai.3-6-2021.2310761.

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Borozan, Aurica Breica. "GREEN MANURE EFFECT ON THE ACTINOMYCETES DIVERSITY AND SOIL BACTERIAL COMMUNITY STRUCTURE". W 15th International Multidisciplinary Scientific GeoConference SGEM2015. Stef92 Technology, 2011. http://dx.doi.org/10.5593/sgem2015/b32/s13.024.

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Fakhour, Samir. "Diversity and geographic distribution of major cereal aphid bacterial communities through metagenomics". W 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.109932.

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Muñoz, Vanessa. "Diversity and phylogenetic analysis of bacterial endosymbionts from ColombianBemisia tabaci(Hemiptera: Aleyrodidae)". W 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.110260.

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Raporty organizacyjne na temat "Bacterial diversity"

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House, Geoffrey Lehman. Understanding the diversity of bacterial and fungal interactions. Office of Scientific and Technical Information (OSTI), czerwiec 2018. http://dx.doi.org/10.2172/1441272.

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Zhao, Bingyu, Saul Burdman, Ronald Walcott i Gregory E. Welbaum. Control of Bacterial Fruit Blotch of Cucurbits Using the Maize Non-Host Disease Resistance Gene Rxo1. United States Department of Agriculture, wrzesień 2013. http://dx.doi.org/10.32747/2013.7699843.bard.

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The specific objectives of this BARD proposal were: (1) To determine whether Rxol can recognize AacavrRxo1 to trigger BFB disease resistance in stable transgenic watermelon plants. (2) To determine the distribution of Aac-avrRxo1 in a global population of Aae and to characterize the biological function of Aac-avrRxo1. (3) To characterize other TIS effectors of Aae and to identify plant R gene(s) that can recognize conserved TIS effectors of this pathogen. Background to the topic: Bacterial fruit blotch (BFB) of cucurbits, caused by Acidovorax avenae subsp. citrulli (Aae), is a devastating disease that affects watermelon (Citrullus lanatus) and melon (Cucumis melo) production worldwide, including both Israel and USA. Two major groups of Aae strains have been classified based on their virulence on host plants, genetics and biochemical properties. Thus far, no effective resistance genes have been identified from cucurbit germplasm. In this project, we assessed the applicability of a non-host disease resistance gene, Rxol, to control BFB in watermelon. We also tried to identify Aae type III secreted (TIS) effectors that can be used as molecular probes to identify novel disease resistance genes in both cucurbits and Nieotianatabaeum. Major conclusions, solutions, achievements: We generated five independent transgenic watermelon (cv. Sugar Babay) plants expressing the Rxol gene. The transgenic plants were evaluated with Aae strains AAC001 and M6 under growth chamber conditions. All transgenic plants were found to be susceptible to both Aae strains. It is possible that watermelon is missing other signaling components that are required for Rxol-mediated disease resistance. In order to screen for novel BFB resistance genes, we inoculated two Aae strains on 60 Nieotiana species. Our disease assay revealed Nicotiana tabaeum is completely resistant to Aae, while its wild relative N. benthamiana is susceptible to Aae. We further demonstrated that Nieotiana benthamiana can be used as a surrogate host for studying the mechanisms of pathogenesis of Aae. We cloned 11 TIS effector genes including the avrRxolhomologues from the genomes of 22 Aae strains collected worldwide. Sequencing analysis revealed that functional avrRxol is conserved in group" but not group I Aae strains. Three effector genes- Aave_1548, Aave_2166 and Aave_2708- possessed the ability to trigger an HR response in N. tabacum when they were transiently expressed by Agrobaeterium. We conclude that N. tabacum carries at least three different non-host resistance genes that can specifically recognize AaeTIS effectors to trigger non-host resistance. Screening 522 cucurbits genotypes with two Aae strains led us to identify two germplasm (P1536473 and P1273650) that are partially resistant to Aae. Interestingly, transient expression of the TIS effector, Aave_1548, in the two germplasms also triggered HR-Iike cell death, which suggests the two lines may carry disease resistance genes that can recognize Aave_1548. Importantly, we also demonstrated that this effector contributes to the virulence of the bacterium in susceptible plants. Therefore, R genes that recognize effector Aave1548 have great potential for breeding for BFB resistance. To better understand the genome diversity of Aae strains, we generated a draft genome sequence of the Israeli Aae strain, M6 (Group I) using Iliumina technology. Comparative analysis of whole genomes of AAC001, and M6 allowed us to identify several effectors genes that differentiate groups I and II. Implications, both scientific and agricultural: The diversity of TIS effectors in group I and II strains of Aae suggests that a subset of effectors could contribute to the host range of group I and II Aae strains. Analysis of these key effectors in a larger Aae population may allow us to predict which cucurbit hosts may be at risk to BFB. Additionally, isolation of tobacco and cucurbit Rgenes that can recognize Aae type III effectors may offer new genetic resources for controlling BFB.
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Crowley, David E., Dror Minz i Yitzhak Hadar. Shaping Plant Beneficial Rhizosphere Communities. United States Department of Agriculture, lipiec 2013. http://dx.doi.org/10.32747/2013.7594387.bard.

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PGPR bacteria include taxonomically diverse bacterial species that function for improving plant mineral nutrition, stress tolerance, and disease suppression. A number of PGPR are being developed and commercialized as soil and seed inoculants, but to date, their interactions with resident bacterial populations are still poorly understood, and-almost nothing is known about the effects of soil management practices on their population size and activities. To this end, the original objectives of this research project were: 1) To examine microbial community interactions with plant-growth-promoting rhizobacteria (PGPR) and their plant hosts. 2) To explore the factors that affect PGPR population size and activity on plant root surfaces. In our original proposal, we initially prqposed the use oflow-resolution methods mainly involving the use of PCR-DGGE and PLFA profiles of community structure. However, early in the project we recognized that the methods for studying soil microbial communities were undergoing an exponential leap forward to much more high resolution methods using high-throughput sequencing. The application of these methods for studies on rhizosphere ecology thus became a central theme in these research project. Other related research by the US team focused on identifying PGPR bacterial strains and examining their effective population si~es that are required to enhance plant growth and on developing a simulation model that examines the process of root colonization. As summarized in the following report, we characterized the rhizosphere microbiome of four host plant species to determine the impact of the host (host signature effect) on resident versus active communities. Results of our studies showed a distinct plant host specific signature among wheat, maize, tomato and cucumber, based on the following three parameters: (I) each plant promoted the activity of a unique suite of soil bacterial populations; (2) significant variations were observed in the number and the degree of dominance of active populations; and (3)the level of contribution of active (rRNA-based) populations to the resident (DNA-based) community profiles. In the rhizoplane of all four plants a significant reduction of diversity was observed, relative to the bulk soil. Moreover, an increase in DNA-RNA correspondence indicated higher representation of active bacterial populations in the residing rhizoplane community. This research demonstrates that the host plant determines the bacterial community composition in its immediate vicinity, especially with respect to the active populations. Based on the studies from the US team, we suggest that the effective population size PGPR should be maintained at approximately 105 cells per gram of rhizosphere soil in the zone of elongation to obtain plant growth promotion effects, but emphasize that it is critical to also consider differences in the activity based on DNA-RNA correspondence. The results ofthis research provide fundamental new insight into the composition ofthe bacterial communities associated with plant roots, and the factors that affect their abundance and activity on root surfaces. Virtually all PGPR are multifunctional and may be expected to have diverse levels of activity with respect to production of plant growth hormones (regulation of root growth and architecture), suppression of stress ethylene (increased tolerance to drought and salinity), production of siderophores and antibiotics (disease suppression), and solubilization of phosphorus. The application of transcriptome methods pioneered in our research will ultimately lead to better understanding of how management practices such as use of compost and soil inoculants can be used to improve plant yields, stress tolerance, and disease resistance. As we look to the future, the use of metagenomic techniques combined with quantitative methods including microarrays, and quantitative peR methods that target specific genes should allow us to better classify, monitor, and manage the plant rhizosphere to improve crop yields in agricultural ecosystems. In addition, expression of several genes in rhizospheres of both cucumber and whet roots were identified, including mostly housekeeping genes. Denitrification, chemotaxis and motility genes were preferentially expressed in wheat while in cucumber roots bacterial genes involved in catalase, a large set of polysaccharide degradation and assimilatory sulfate reduction genes were preferentially expressed.
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Zchori-Fein, Einat, Judith K. Brown i Nurit Katzir. Biocomplexity and Selective modulation of whitefly symbiotic composition. United States Department of Agriculture, czerwiec 2006. http://dx.doi.org/10.32747/2006.7591733.bard.

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Whiteflies are sap-sucking insects that harbor obligatory symbiotic bacteria to fulfill their dietary needs, as well as a facultative microbial community with diverse bacterial species. The sweetpotato whitefly Bemisia tabaci (Gennadius) is a severe agricultural pest in many parts of the world. This speciesconsists of several biotypes that have been distinguished largely on the basis of biochemical or molecular diagnostics, but whose biological significance is still unclear. The original objectives of the project were (i) to identify the specific complement of prokaryotic endosymbionts associated with select, well-studied, biologically and phylogeographically representative biotypes of B. tabaci, and (ii) to attempt to 'cure’ select biotypes of certain symbionts to permit assessment of the affect of curing on whitefly fitness, gene flow, host plant preference, and virus transmission competency.To identify the diversity of bacterial community associated with a suite of phylogeographically-diverseB. tabaci, a total of 107 populations were screened using general Bacteria primers for the 16S rRNA encoding gene in a PCR. Sequence comparisons with the available databases revealed the presence of bacteria classified in the: Proteobacteria (66%), Firmicutes (25.70%), Actinobacteria (3.7%), Chlamydiae (2.75%) and Bacteroidetes (<1%). Among previously identified bacteria, such as the primary symbiont Portiera aleyrodidarum, and the secondary symbionts Hamiltonella, Cardinium and Wolbachia, a Rickettsia sp. was detected for the first time in this insect family. The distribution, transmission, and localization of the Rickettsia were studied using PCR and fluorescence in situ hybridization (FISH). Rickettsia was found in all 20 Israeli B. tabaci populations screened as well as some populations screened in the Arizona laboratory, but not in all individuals within each population. FISH analysis of B. tabaci eggs, nymphs and adults, revealed a unique concentration of Rickettsia around the gut and follicle cells as well as its random distribution in the haemolymph, but absence from the primary symbiont housing cells, the bacteriocytes. Rickettsia vertical transmission on the one hand and its partial within-population infection on the other suggest a phenotype that is advantageous under certain conditions but may be deleterious enough to prevent fixation under others.To test for the possible involvement of Wolbachia and Cardiniumin the reproductive isolation of different B. tabacibiotypes, reciprocal crosses were preformed among populations of the Cardinium-infected, Wolbachia-infected and uninfected populations. The crosses results demonstrated that phylogeographically divergent B. tabaci are reproductively competent and that cytoplasmic incompatibility inducer-bacteria (Wolbachia and Cardinium) both interfered with, and/or rescued CI induced by one another, effectively facilitating bidirectional female offspring production in the latter scenario.This knowledge has implications to multitrophic interactions, gene flow, speciation, fitness, natural enemy interactions, and possibly, host preference and virus transmission. Although extensive and creative attempts undertaken in both laboratories to cure whiteflies of non-primary symbionts have failed, our finding of naturally uninfected individuals have permitted the establishment of Rickettsia-, Wolbachia- and Cardinium-freeB. tabaci lines, which are been employed to address various biological questions, including determining the role of these bacteria in whitefly host biology.
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Or, Dani, Shmulik Friedman i Jeanette Norton. Physical processes affecting microbial habitats and activity in unsaturated agricultural soils. United States Department of Agriculture, październik 2002. http://dx.doi.org/10.32747/2002.7587239.bard.

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experimental methods for quantifying effects of water content and other dynamic environmental factors on bacterial growth in partially-saturated soils. Towards this end we reviewed critically the relevant scientific literature and performed theoretical and experimental studies of bacterial growth and activity in modeled, idealized and real unsaturated soils. The natural wetting-drying cycles common to agricultural soils affect water content and liquid organization resulting in fragmentation of aquatic habitats and limit hydraulic connections. Consequently, substrate diffusion pathways to soil microbial communities become limiting and reduce nutrient fluxes, microbial growth, and mobility. Key elements that govern the extent and manifestation of such ubiquitous interactions include characteristics of diffusion pathways and pore space, the timing, duration, and extent of environmental perturbations, the nature of microbiological adjustments (short-term and longterm), and spatial distribution and properties of EPS clusters (microcolonies). Of these key elements we have chosen to focus on a manageable subset namely on modeling microbial growth and coexistence on simple rough surfaces, and experiments on bacterial growth in variably saturated sand samples and columns. Our extensive review paper providing a definitive “snap-shot” of present scientific understanding of microbial behavior in unsaturated soils revealed a lack of modeling tools that are essential for enhanced predictability of microbial processes in soils. We therefore embarked on two pronged approach of development of simple microbial growth models based on diffusion-reaction principles to incorporate key controls for microbial activity in soils such as diffusion coefficients and temporal variations in soil water content (and related substrate diffusion rates), and development of new methodologies in support of experiments on microbial growth in simple and observable porous media under controlled water status conditions. Experimental efforts led to a series of microbial growth experiments in granular media under variable saturation and ambient conditions, and introduction of atomic force microscopy (AFM) and confocal scanning laser microscopy (CSLM) to study cell size, morphology and multi-cell arrangement at a high resolution from growth experiments in various porous media. The modeling efforts elucidated important links between unsaturated conditions and microbial coexistence which is believed to support the unparallel diversity found in soils. We examined the role of spatial and temporal variation in hydration conditions (such as exist in agricultural soils) on local growth rates and on interactions between two competing microbial species. Interestingly, the complexity of soil spaces and aquatic niches are necessary for supporting a rich microbial diversity and the wide array of microbial functions in unsaturated soils. This project supported collaboration between soil physicists and soil microbiologist that is absolutely essential for making progress in both disciplines. It provided a few basic tools (models, parameterization) for guiding future experiments and for gathering key information necessary for prediction of biological processes in agricultural soils. The project sparked a series of ongoing studies (at DTU and EPFL and in the ARO) into effects of soil hydration dynamics on microbial survival strategy under short term and prolonged desiccation (important for general scientific and agricultural applications).
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Wurl, Oliver. Biofilm-like habitat at the sea-surface: A mesocosm study, Cruise No. POS537, 14.09.2019 – 04.10.2019, Malaga (Spain) – Cartagena (Spain) - BIOFILM. University of Oldenburg, listopad 2020. http://dx.doi.org/10.3289/cr_pos537.

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OceanRep OceanRep Startseite Kontakt Schnellsuche Einfache Suche Erweiterte Suche Blättern Autor Forschungsbereich Publikationsart Jahr Studiengang Neuzugänge Artikel – begutachtet Alle Über uns GEOMAR Bibliothek Open Access Policies Grundsätze Hilfe FAQs Statistik Impressum Biofilm-like habitat at the sea-surface: A mesocosm study, Cruise No. POS537, 14.09.2019 – 04.10.2019, Malaga (Spain) – Cartagena (Spain) - BIOFILM . Logged in as Heidi Düpow Einträge verwaltenManage recordsManage shelvesProfilGespeicherte SuchenBegutachtungAdminLogout - Tools Wurl, Oliver, Mustaffa, Nur Ili Hamizah, Robinson, Tiera-Brandy, Hoppe, Jennifer, Jaeger, Leonie, Striebel, Maren, Heinrichs, Anna-Lena, Hennings, Laura Margarethe, Goncalves, Rodrigo, Ruiz Gazulla, Carlota und Ferrera, Isabel (2020) Biofilm-like habitat at the sea-surface: A mesocosm study, Cruise No. POS537, 14.09.2019 – 04.10.2019, Malaga (Spain) – Cartagena (Spain) - BIOFILM . Open Access . POSEIDON Berichte . University of Oldenburg, Oldenburg, 35 pp. [img] Text Cruise_Reports_POS537_final.pdf - publizierte Version Available under License Creative Commons: Attribution 4.0. Download (2417Kb) | Vorschau Abstract Biofilm-like properties can form on sea surfaces, but an understanding of the underlying processes leading to the development of these biofilms is not available. We used approaches to study the development of biofilm-like properties at the sea surface, i.e. the number, abundance and diversity of bacterial communities and phytoplankton, the accumulation of gel-like particles and dissolved tracers. During the expedition POS537 we used newly developed and free drifting mesocosms and performed incubation experiments. With these approaches we aim to investigate the role of light and UV radiation as well as the microbes themselves, which lead to the formation of biofilms. With unique microbial interactions and photochemical reactions, sea surface biofilms could be biochemical reactors with significant implications for ocean and climate research, e.g. with respect to the marine carbon cycle, diversity of organisms and oceanatmosphere interactions.
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