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Littérature scientifique sur le sujet « Impact on microbial community »

Auteur : Grafiati
Publié le 11 janvier 2025

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Articles de revues sur le sujet "Impact on microbial community"

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Сhirаnjeeb, Kumаr. « Effect of Climatic Change on Soil Microbial Community ». Emerging Trends in Climate Change 1, no 2 (28 juillet 2022) : 1–8. http://dx.doi.org/10.18782/2583-4770.106.

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Climate change is the most severe problem that adversely affects crop productivity and negatively impacts soil microbial biodiversity, which is considered the key component of soil fertility indicators. Microbial biodiversity regulates all necessary functions to strengthen and maintain the stability of the ecosystem. Climate change primarily affects the crop microclimate, which in turn destroys the ecological balance and disrupts the ideal growth conditions for the crops and hampers the proliferation of microorganisms in the environment, thus decreasing crop production over a particular region. Climate change conditions such as higher temperature, rainfall and other abrupt conditions destroy the equilibrium between microbes, plants and the environment to a large extent, altering the plant-microbe interactions. Higher Carbon dioxide concentration favours the crop in photosynthesis and helps achieve higher productivity. Microbial respiration also enhances the carbon dioxide concentration in the atmosphere, leading to global warming and other potentially hazardous conditions. Mitigation strategies on crop, soil and land management measures are important to counteract the negative impact of climate change.
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RINGELBERG, D. B., C. M. REYNOLDS et L. KARR. « Microbial Community Composition Near Depleted Uranium Impact Points ». Soil and Sediment Contamination : An International Journal 13, no 6 (novembre 2004) : 563–77. http://dx.doi.org/10.1080/10588330490519446.

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Jingang, Liang, Luan Ying, Jiao Yue, Sun Shi, Wu Cunxiang, Wu Haiying, Zhang Mingrong, Zhang Haifeng, Zheng Xiaobo et Zhang Zhengguang. « High-methionine soybean has no significant effect on nitrogen-transforming bacteria in rhizosphere soil ». Plant, Soil and Environment 64, No. 3 (21 mars 2018) : 108–13. http://dx.doi.org/10.17221/750/2017-pse.

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Transgenic plants may induce shifts in the microbial community composition that in turn alter microbially-mediated nutrient cycling in soil. Studies of how specific microbial groups respond to genetically modified (GM) planting help predict potential impacts upon processes performed by these groups. This study investigated the effect of transgenic high-methionine soybean cv. ZD91 on nitrogen-fixing and ammonia-oxidizing bacterial populations. A difference in nitrogen-fixing or ammonia-oxidizing bacteria community composition was not found, suggesting that cv. ZD91 does not alter the bacterial populations in rhizosphere soil. This study increases our understanding of the potential effect of transgenic soybean on microbial functional groups within soil by suggesting that nitrogen-transforming bacteria may be useful for future investigations on the GM crops impact in the soil ecosystem.
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Matusiak, Katarzyna, Sebastian Borowski, Sebastian Opaliński, Tadeusz Bakuła, Roman Kołacz et Beata Gutarowska. « Impact of a microbial-mineral biopreparation on microbial community and deodorization of manures ». Acta Biochimica Polonica 62, no 4 (2015) : 791–98. http://dx.doi.org/10.18388/abp.2015_1135.

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Tamminen, Manu, Jenny Spaak, Ahmed Tlili, Rik Eggen, Christian Stamm et Katja Räsänen. « Wastewater constituents impact biofilm microbial community in receiving streams ». Science of The Total Environment 807 (février 2022) : 151080. http://dx.doi.org/10.1016/j.scitotenv.2021.151080.

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Massana, Ramon, Josep M. Gasol, Klaus J¨rgens et Carlos Pedròs-Aliò. « Impact of Daphnia pulex on a metalimnetic microbial community ». Journal of Plankton Research 16, no 10 (1994) : 1379–99. http://dx.doi.org/10.1093/plankt/16.10.1379.

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Tong, Zhonghua, Marianne Bischoff, Loring Nies, Bruce Applegate et Ronald F. Turco. « Impact of Fullerene (C60) on a Soil Microbial Community ». Environmental Science & ; Technology 41, no 8 (avril 2007) : 2985–91. http://dx.doi.org/10.1021/es061953l.

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An, Lingling. « Accurate Prediction of Death Time via Integrating Microbial Community Dynamics ». International Journal of Forensic Sciences 9, no 1 (2024) : 1–9. http://dx.doi.org/10.23880/ijfsc-16000353.

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This study addresses the challenge of accurately estimating Postmortem Interval (PMI), the time since death, employing a data-driven approach. PMI determination is crucial in forensic investigations, and traditional methods often lack precision. We focus on utilizing a data mining approach Regularized Random Forest with cross-validation to enhance PMI prediction accuracy. Unlike conventional methods, our approach incorporates external information about the deceased, recognizing the impact of contextual factors on PMI estimation. Recent advancements have seen statistical methods leveraging dynamic changes in microbial communities to predict PMI. However, accuracy has been hindered by various sources of noise. To overcome this limitation, we propose a novel data mining approach, integrating cross-validation techniques and external information to refine PMI predictions. Through an empirical demonstration, we establish that our approach surpasses existing procedures in terms of accuracy, as validated against published datasets. This research contributes to the advancement of PMI estimation methodologies, emphasizing the importance of incorporating comprehensive data mining techniques and contextual information for more precise forensic applications.
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Ibekwe, A. Mark, Sharon K. Papiernik, Jianying Gan, Scott R. Yates, Ching-Hong Yang et David E. Crowley. « Impact of Fumigants on Soil Microbial Communities ». Applied and Environmental Microbiology 67, no 7 (1 juillet 2001) : 3245–57. http://dx.doi.org/10.1128/aem.67.7.3245-3257.2001.

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ABSTRACT Agricultural soils are typically fumigated to provide effective control of nematodes, soilborne pathogens, and weeds in preparation for planting of high-value cash crops. The ability of soil microbial communities to recover after treatment with fumigants was examined using culture-dependent (Biolog) and culture-independent (phospholipid fatty acid [PLFA] analysis and denaturing gradient gel electrophoresis [DGGE] of 16S ribosomal DNA [rDNA] fragments amplified directly from soil DNA) approaches. Changes in soil microbial community structure were examined in a microcosm experiment following the application of methyl bromide (MeBr), methyl isothiocyanate, 1,3-dichloropropene (1,3-D), and chloropicrin. Variations among Biolog fingerprints showed that the effect of MeBr on heterotrophic microbial activities was most severe in the first week and that thereafter the effects of MeBr and the other fumigants were expressed at much lower levels. The results of PLFA analysis demonstrated a community shift in all treatments to a community dominated by gram-positive bacterial biomass. Different 16S rDNA profiles from fumigated soils were quantified by analyzing the DGGE band patterns. The Shannon-Weaver index of diversity,H, was calculated for each fumigated soil sample. High diversity indices were maintained between the control soil and the fumigant-treated soils, except for MeBr (H decreased from 1.14 to 0.13). After 12 weeks of incubation, Hincreased to 0.73 in the MeBr-treated samples. Sequence analysis of clones generated from unique bands showed the presence of taxonomically unique clones that had emerged from the MeBr-treated samples and were dominated by clones closely related to Bacillus spp. andHeliothrix oregonensis. Variations in the data were much higher in the Biolog assay than in the PLFA and DGGE assays, suggesting a high sensitivity of PLFA analysis and DGGE in monitoring the effects of fumigants on soil community composition and structure. Our results indicate that MeBr has the greatest impact on soil microbial communities and that 1,3-D has the least impact.
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Mlejnková, H., et K. Sovová. « Impact of pollution and seasonal changes on microbial community structure in surface water ». Water Science and Technology 61, no 11 (1 juin 2010) : 2787–95. http://dx.doi.org/10.2166/wst.2010.080.

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We studied the differences in a microbial community structure with respect to the water pollution level and seasonal changes. The determination of phylogenetic groups of Bacteria and Archaea was done using fluorescent in situ hybridization (FISH). The total number of microorganisms was determined by direct counting of DAPI (4′,6-diamidino-2-phenylindole) stained samples using a fluorescence microscope. Our results showed that the microbial community structure was significantly dependent on the level of water pollution, both in absolute microbial counts and in relative abundance of phylogenetic groups. For surface water with anthropogenic pollution, the microbial community with significant proportion of Betaproteobacteria and Cytophaga-Flavobacterium was characteristic. Gammaproteobacteria were significant in municipal waste water. In microbial communities with low numbers of microorganisms (e.g. non-polluted water and some industrial waste water) represented the significant component groups Alphaproteobacteria and Archaea. The impact of seasonal changes on the microbial distribution was not significant.
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Thèses sur le sujet "Impact on microbial community"

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Cartwright, Colin. « Biodegradation and impact of phthalate plasticisers on a soil microbial community ». Thesis, University of Kent, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264768.

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Lekkas, Panagiotis. « The Microbial Ecology Of Listeria Monocytogenes As Impacted By Three Environments : A Cheese Microbial Community ; A Farm Environment ; And A Soil Microbial Community ». ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/463.

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This dissertation examined the microbial ecology of Listeria monocytogenes in three distinctly different environments: a cheese microbial community; a farm environment; and a soil microbial community. The aim of the first study was to investigate the effects of L. monocytogenes on the composition of the surface microflora on washed rind soft cheese. Two trials with washed rind cheeses that were inoculated with 100cfu cm⁻² of a L. monocytogenes six strain cocktail were conducted. The first trial had to be terminated early (day 28) as contamination of Pseudomonas spp. from the initial brine did not produce the expected characteristics of the cheese during the aging period. For the second trial, cheese samples were aged in the lab for 60 days according to the cheesemakers specifications. Surface cheese rind samples were collected from both control and inoculated cheeses every 7 days. Cheese rind samples were analyzed through the standard BAM method for enumeration of L. monocytogenes and through amplification of the V4 region of 16S rRNA and ITS regions for identification of the surface rind bacterial and fungal communities, respectively. Our data showed that Pseudomonas spp. significantly changed the composition of the microorganisms found on the surface of the rind while L. monocytogenes had little effect. In addition, although the concentration of L. monocytogenes increased to levels of 10⁶ cfu cm⁻² based on the enumeration data, the genetic data was not able to identify it in the flora due to the fact that other genera were found at much higher concentrations, which is a limitation of molecular methods used for identification of pathogens in foods. For the second study the presence and incidence of L. monocytogenes on farms that either produce raw milk cheese or supply the milk for raw milk cheese production was investigated. Five farms were visited and in total 266 samples were collected from barn, environmental, and milk sites. L. monocytogenes prevalence was found to be at 6% from all the farms tested with 10 isolates found in the barn samples, 5 from environmental sites and 1 from milking equipment. Samples were identified to the genus level through a modified BAM method and speciated though multiplex PCR. Included in the pathogenic isolates was a DUP-1042B L. monocytogenes strain that has been implicated in major outbreaks, which emphasizes the adaptability and persistence of highly pathogenic stains in food manufacturing environments. Results from this study continue to support the fact that contaminated silage can be an important reservoir of the pathogen in a dairy farm setting. From our data and field observations we identified that drinking water sources for the animals is also an important reservoir of L. monocytogenes in farm environments. More importantly this study has shown the importance of continuous monitoring of environmental sites for the presence of the pathogen, particularly in silage. Lastly manure amended soils in the northeastern U.S. were tested for the presence and survival of rifampicin resistant Escherichia coli (rE. coli), generic E. coli (gE. coli) and Listeria spp.. Both gE.coli and rE.coli samples were processed using either direct enumeration, MPN or bag enrichment methods. Samples were taken from both tilled and surface dairy solid manure-amended plots. Listeria samples were processed using a modified BAM method. Listeria presence was constant throughout the study. In contrast, rE. coli and gE. coli levels declined with time. The main conclusions of this study were that soil type, location and physical characteristics have a significant role in the survival of bacterial populations of rE. coli, gE. coli and Listeria spp. in soil. Dairy solids application does not seem to have a long term effect on the natural microbial population of soils. Tilling of soils results in increased survival of the bacterial population due to the fact that it increases soil pore size and facilitates moisture entry, which in turn has been shown to increase bacterial survival rates. Data from this research will assist in the creation of preventative measures that lead to the elimination of pathogen reservoirs. It will be further used to verify that a 120 day interval following manure application should be sufficient to ensure food safety of edible crops subsequently planted on these soils.
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Elfstrand, Sara. « Impact of green manure on soil organisms : with emphasis on microbial community composition and function / ». Uppsala : Department of Soil Sciences, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200723.pdf.

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Veresoglou, Stravros D. « The impact of arbuscular mycorrhizal fungi on N-Cyclin related rhizosphere microbial community structure and function ». Thesis, Manchester Metropolitan University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517616.

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Phommasack, Kinnalone. « The impact of pH on microbial community structures in a long-term fertiliser experiment Palace Leas plot ». Thesis, University of Newcastle upon Tyne, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500930.

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Yu, Xiaolong. « FTOH Biodegradation Properties and PFOA Impact on Microorganisms in Activated Sludge ». Kyoto University, 2018. http://hdl.handle.net/2433/231017.

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Suleman, Muhammad. « Fate of pesticides and assessment of their impact on the soil microbial community using liquid chromatography tandem-mass spectrometry ». Thesis, University of York, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547341.

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Tsigarida, Alexandra. « Investigations on the microbial community associated with peri-implantitis in smokers and non-smokers ». The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1371071124.

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Papin, Marine. « Efficiency and impact of recurrent microbial inoculation in soil, a lab to field assessment ». Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCK051.

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Face à l'urgence de mettre en place des pratiques plus durables pour protéger l'environnement tout en maintenant la production agricole, les inoculants microbiens suscitent un intérêt croissant en raison de leur potentiel pour réduire la dépendance aux intrants synthétiques. Cependant, malgré des décennies de recherche sur les inoculants microbiens du sol, leurs bénéfices sur les rendements agricoles restent très variables en fonction des sols, des climats, des génotypes végétaux et des souches inoculées, rendant les résultats difficiles à prédire et fragilisant in fine la confiance des agriculteurs. Ce travail explore la pertinence des inoculations récurrentes comme levier pour atténuer la résistance biotique de la communauté microbienne résidente du sol et favoriser l’établissement de l’inoculant. Ce travail étudie également les impacts de ces inoculations sur la communauté microbienne résidente. Dans une première expérience en microcosme, nous avons montré que l'inoculation récurrente pouvait améliorer, de manière transitoire l'abondance de l'inoculant (Pseudomonas fluorescens) avec un impact mineur sur la communauté bactérienne résidente. Une deuxième expérience en serre a mis en évidence le potentiel inattendu de l'inoculation récurrente, réalisée jusqu’au semis, pour favoriser la croissance du maïs avec un moindre impact sur la communauté bactérienne résidente par rapport à l'inoculation récurrente à partir du semis. La troisième expérience, réalisée au champ, a reflété les défis de transférer les bénéfices observés sur la croissance des plantes des conditions contrôlées vers des conditions non contrôlées. Finalement, ce travail suggère que le moment et la fréquence de l'inoculation doivent être ajustés de manière complémentaire. C’est-à-dire que l'inoculation récurrente peut augmenter temporairement l’abondance de l’inoculant lors des stades précoces critiques de la croissance des plantes. Cela peut soit favoriser la colonisation de l’hôte lorsqu’une dose adéquate est appliquée, soit influencer indirectement la communauté microbienne du sol au moment du semis
With the urgent need to adopt more sustainable practices that sustain agricultural production while protecting the environment, microbial inoculants are gaining increasing attention for their potential to reduce reliance on agrochemicals. However, despite decades of research, the benefits of soil microbial inoculants for crop yields remain highly variable across different soils, climates, plant genotypes, and inoculant strains. This variability makes outcomes difficult to predict and may ultimately reduce farmers’ confidence. This work explores the potential of recurrent inoculations as a strategy to overcome the biotic resistance of the resident soil microbial community and promote inoculant establishment. It also examines the effects of these inoculations on the resident microbial community. In a first microcosm experiment, we showed that recurrent inoculation could transiently improve the abundance of the inoculant (Pseudomonas fluorescens) with minimal impact on the resident bacterial community. A second experiment in greenhouse evidenced the unexpected potential of recurrent inoculation carried out until sowing to enhance maize growth while exerting a weaker impact on the bacterial resident community compared to recurrent inoculation starting at sowing. The third experiment conducted under field conditions reflected the challenges of translating the growth benefits observed in controlled environments to uncontrolled field conditions. Overall, this work suggests that both the timing and frequency of inoculation should be adjusted in a complementary way. Specifically, recurrent inoculation may transiently enhance the abundance of the inoculant during the critical early stages of plant growth. This may either promote successful host colonization when an adequate dose is applied, or indirectly influence the soil microbial community at sowing
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Cáliz, Gelador Joan. « Impact of chlorophenols and heavy metals on soil microbiota : their effects on activity and community composition, and resistant strains with potential for bioremediation ». Doctoral thesis, Universitat de Girona, 2011. http://hdl.handle.net/10803/80914.

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Pollution by toxic compounds is one of the most relevant environmental damages to ecosystems produced by human activity and, therefore, it must be considered in environmental protection and restoration of contaminated sites. According to this purposes, the main goal of this doctoral thesis has been to analyse the impact of several chlorophenols and heavy metals on the microbial communities of two typical Mediterranean soils. The ecological risk concentrations of each pollutant, which have been determined according to respirometric activity and changes in the microbial community composition, and the factors that influence on their effective toxic concentrations (bioavailable pollutants) have been analysed in order to predict their potential impact on different soil ecosystems and provide scientific data for the regulation of the soil protection policies. Moreover, resistant microorganisms with pollutant removal capacities have been isolated from artificially contaminated soil microcosms and tested in axenic cultures, to infer their potential usefulness for bioremediation.
La contaminació amb compostos tòxics antropogènics és un dels perjudicis ambientals més rellevants per als ecosistemes i, per tant, cal tenir-ho en compte en la protecció ambiental i la restauració de llocs contaminats. Amb aquests propòsits, l’objectiu principal d’aquesta tesi doctoral ha estat analitzar l’impacte de clorofenols i metalls pesants sobre la microbiota de dos sòls típicament mediterranis. S’han analitzat les concentracions de risc ecològic de cada contaminant, determinades segons activitat respiromètrica i canvis en la composició de la comunitat microbiana, i els factors que influeixen en les seves concentracions tòxiques efectives (contaminants biodisponibles), per predir l’impacte potencial sobre diferents ecosistemes edàfics i proporcionar evidències científiques per a les polítiques de protecció del sòl. D’altra banda, a partir de microcosmos edàfics contaminats artificialment, es van aïllar també microorganismes resistents amb capacitat per eliminar els contaminants, que van ser analitzats en cultius purs per avaluar-ne la utilitat potencial en bioremediació.
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Livres sur le sujet "Impact on microbial community"

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W, LeChevallier Mark, et AWWA Research Foundation, dir. Microbial impact of biological filtration. Denver, Colo : AWWA Research Foundation, 1998.

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Lichfield, Nathaniel. Community impact evaluation. London : UCL Press, 1996.

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Shah, Maulin P. Microbial Community Studies in Industrial Wastewater Treatment. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9781003354147.

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Cities, Belfast Healthy, et Ards Peninsula Community Steering Group., dir. Community health impact assessment. Belfast : Ards Peninsula Community Steering Group and Belfast Healthy Cities, 2004.

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United States. Federal Highway Administration. Office of Environment and Planning., dir. Community impact mitigation : Case studies. Washington, D.C : Federal Highway Administration, Office of Environment and Planning, 1998.

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NHS Executive. Information Management Group. The impact on community providers. [Leeds] : IMG, NHS Executive, 1994.

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Cheryl, Irons-Guynn, Weiland Doris et United States. Bureau of Justice Assistance, dir. Community prosecution strategies : Measuring impact. [Washington, D.C.] : U.S. Dept. of Justice, Office of Justice Programs, Bureau of Justice Assistance, 2002.

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Wigfull, Sharon Denise. Recovery of the indigenous soil microbial community after landfilling. London : PEL, 1990.

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Gladys, Netro, et Canadian Environmental Assessment Research Council., dir. Community impact assessment : The community of Old Crow, Yukon. Hull, Quebec : Canadian Environmental Assessment Research Council, 1989.

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EA Engineering, Science, and Technology, Inc. et American Petroleum Institute, dir. Vanadium : Environmental and community health impact. Washington, D.C : The Institute, 1985.

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Chapitres de livres sur le sujet "Impact on microbial community"

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Mekala, Srikanth, et Srilatha Polepongu. « Impact of Climate Change on Soil Microbial Community ». Dans Plant Biotic Interactions, 31–41. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-26657-8_3.

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Sharma, Shilpi, Richa Sharma, Rashi Gupta et Virendra Swarup Bisaria. « Revisiting Action of Bioinoculants : Their Impact on Rhizospheric Microbial Community Function ». Dans Microbial Inoculants in Sustainable Agricultural Productivity, 41–51. New Delhi : Springer India, 2016. http://dx.doi.org/10.1007/978-81-322-2644-4_3.

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Fritze, Hannu, Taina Pennanen et Pekka Vanhala. « Impact of Fertilizers on the Humus Layer Microbial Community of Scots Pine Stands Growing Along a Gradient of Heavy Metal Pollution ». Dans Microbial Communities, 68–83. Berlin, Heidelberg : Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60694-6_7.

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Gillan, David C., et Rob Van Houdt. « The Impact of Metal Contamination on Soil Microbial Community Dynamics ». Dans Modern Soil Microbiology, 403–19. Third edition. | Boca Raton : Taylor & Francis, 2019. : CRC Press, 2019. http://dx.doi.org/10.1201/9780429059186-24.

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Bej, Asim K., Michael Perlin et Ronald M. Atlas. « Impact of Introducing Genetically-Modified Microorganisms on Soil Microbial Community Diversity ». Dans The Release of Genetically Modified Microorganisms—REGEM 2, 137–39. Boston, MA : Springer US, 1992. http://dx.doi.org/10.1007/978-1-4613-0493-7_16.

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Prakash, Ved, Sneha Tripathi, Samarth Sharma, Shweta Rana, Vivek Kumar, Durgesh Kumar Tripathi et Shivesh Sharma. « Rhizospheric Microbial Community as Drivers of Soil Ecosystem : Interactive Microbial Communication and Its Impact on Plants ». Dans Re-visiting the Rhizosphere Eco-system for Agricultural Sustainability, 355–71. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4101-6_17.

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Ventorino, Valeria, Anna De Marco, Olimpia Pepe, Amalia Virzo De Santo et Giancarlo Moschetti. « Impact of Innovative Agricultural Practices of Carbon Sequestration on Soil Microbial Community ». Dans Carbon Sequestration in Agricultural Soils, 145–77. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23385-2_6.

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Theorell, Axel, et Jörg Stelling. « Microbial Community Decision Making Models in Batch and Chemostat Cultures ». Dans Computational Methods in Systems Biology, 141–58. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85633-5_9.

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AbstractMicrobial community simulations using genome scale metabolic networks (GSMs) are relevant for many application areas, such as the analysis of the human microbiome. Such simulations rely on assumptions about the culturing environment, affecting if the culture may reach a metabolically stationary state with constant microbial concentrations. They also require assumptions on decision making by the microbes: metabolic strategies can be in the interest of individual community members or of the whole community. However, the impact of such common assumptions on community simulation results has not been investigated systematically. Here, we investigate four combinations of assumptions, elucidate how they are applied in literature, provide novel mathematical formulations for their simulation, and show how the resulting predictions differ qualitatively. Crucially, our results stress that different assumption combinations give qualitatively different predictions on microbial coexistence by differential substrate utilization. This fundamental mechanism is critically under explored in the steady state GSM literature with its strong focus on coexistence states due to crossfeeding (division of labor).
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Vyas, Trupti K., et Anjana K. Vala. « The Impact of Magnetic Nanoparticles on Microbial Community Structure and Function in Rhizospheric Soils ». Dans Handbook of Magnetic Hybrid Nanoalloys and their Nanocomposites, 949–73. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90948-2_44.

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Tripathi, Binu M., Itumeleng Moroenyane et Jonathan M. Adams. « THE IMPACT OF AGRICULTURE ON SOIL MICROBIAL COMMUNITY COMPOSITION AND DIVERSITY IN SOUTHEAST ASIA ». Dans Microbes for Climate Resilient Agriculture, 25–40. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119276050.ch2.

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Actes de conférences sur le sujet "Impact on microbial community"

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Maya, Bárbara, Yocanxóchitl Perfecto-Avalos, Abel Gutiérrez-Vilchis et Alejandro Garcia-Gonzalez. « Software sensor to monitor a synthetic microbial community emulating the dietary fiber impact on the gut microbiota ». Dans 2024 46th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 1–4. IEEE, 2024. https://doi.org/10.1109/embc53108.2024.10782821.

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Schrad, Nicole, et Chad Saltikov. « Impacts of Stormwater Infiltration on the Microbial Community during Managed Aquifer Recharge ». Dans Goldschmidt2021. France : European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.3033.

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Abbaszade, Gorkhmaz, Davaakhuu Tserendorj, Nelson Salazar, Dora Zachary, Erika Toth et Csaba Szabó. « The impact of soil metal(loid) and physicochemical properties on soil microbial community structure in urban areas ». Dans Goldschmidt2022. France : European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.12195.

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Maniglio, Marco, Giacomo Rivolta, Ahmed Elgendy, Paola Panfili et Alberto Cominelli. « Evaluating the Impact of Biochemical Reactions on H2 Storage in Depleted Gas Fields ». Dans SPE Annual Technical Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/215142-ms.

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Abstract Underground Hydrogen Storage (UHS) is an emerging technology to store energy, produced by renewable sources, into subsurface porous formations. UHS efficiency in depleted gas reservoirs can be affected by H2 biochemical degradation due to interactions with rock, brine and gas. In the reservoir, subsurface microorganisms can metabolize H2 with possible hydrogen losses, H2S production, clogging and formation damage. In this work we investigate the impact of hydrogen losses due to microbial activities on UHS operations in depleted gas reservoirs lying in sandstone formations. We developed a workflow to exploit the chemical reactive transport functionalities of a commercial reservoir simulator, to model biochemical processes occurring in UHS. Kinetic chemical reaction formulation was used to replicate a Monod's type microorganism growth, using PHREEQC to tune reaction parameters by matching a 0-D process in an ideal reactor. Then, we applied the methodology to evaluate the impact of biotic reactions on UHS operations in depleted gas fields. Eventually, various sensitivities were carried out considering injection/production cycles lengths, cushion gas volumes and microbial model parameters. Benchmark against PHREEQC demonstrated that, by properly tuning the kinetic reaction model coefficients, we are capable of adequately reproduce Monod-like growth and competition of different microbial community species. Field-scale results showed that hydrogen losses due to biochemistry are limited, even though this may depend on the availability of reactants in the specific environment: in this work we focus on gas reservoirs where the molar fraction of the key nutrient, CO2, is small (< 2%) and the formation is a typical sandstone. Operational parameters, e.g. storage cycle length, have an impact on the biochemical dynamics and, then, on the hydrogen degradation and generation of undesired by-products. Similar considerations hold for the model microbial growth kinetic parameters: in this study they were established using available literature data for calibration, but we envisage to tune them using experimental results on specific reservoirs. The current model set-up does not account for rock-fluid geochemical interactions, which may result in mineral precipitation/dissolution affecting the concentration of substrates available for biotic reactions. Nonetheless, it can provide an estimate of hydrogen consumption during storage in depleted gas reservoirs due to microbial activities. This study is among the first attempts to evaluate the impact of hydrogen losses by the presence of in situ microbial populations during hydrogen storage in a realistic depleted gas field. The assessment was performed by implementing a novel workflow to encapsulate biochemical reactions and bacterial dynamic-growth in commercial reservoir simulators, which may be applied to estimate the efficiency and associated risks of future UHS projects.
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Noszczyńska, Magdalena, Magdalena Pacwa-Płociniczak, Kinga Bondarczuk et Zofia Piotrowska-Seget. « Bisphenol A And Bisphenol S Biodegradation In The River Water-Sediment Microcosms And Their Impact On The Biodiversity Of Autochthonous Microbial Community ». Dans The 8th World Congress on New Technologies. Avestia Publishing, 2022. http://dx.doi.org/10.11159/icnfa22.105.

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Ismail, W., T. Tengku Zainal Alam Shah, M. Mawardi, M. T. Lajawai, M. M. Tahir, A. A. Bak, L. Koyyalamudi et al. « Mitigating H2S at Offshore Malaysia's Mature Oilfield : Pilot Nitrate Injection Evaluation ». Dans SPE Symposium and Exhibition - Production Enhancement and Cost Optimisation. SPE, 2024. http://dx.doi.org/10.2118/220620-ms.

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Abstract Mature oil fields under seawater waterflood scheme are prone to souring and H2S production by reservoir souring due to H2S production by sulfate-reducing bacteria (SRB) that threatens to production, facilities, environment, and the people. This study aims to tackles this challenge ahead-on, presenting a comprehensive evaluation and optimization of a pilot nitrate injection strategy deployed in a mature Malaysian field afflicted by souring. With the introduction of nitrate injection to the field, the operator aims to reduce H2S concentrations from a high of 2000ppm to near zero. Such a feat would not only safeguard production but also unlock substantial economic benefits. By curbing H2S, the team potentially avert the escalating costs of topside H2S scavengers, and the major facilities upgrade for ten wells spewing 2000ppm of toxic gas. This translates to a direct financial reward for the field, while simultaneously protecting the environment and ensuring operational longevity. To assess the effectiveness of the pilot nitrate injection, an integrated approach combining laboratory experiments, numerical modeling, and field monitoring was employed. Literature studies were conducted to determine the optimal nitrate concentration and injection rate for suppressing SRB activity. The obtained results were then used to design the operational aspects of nitrate injection and performance monitoring in the absence of lab studies. Field monitoring involved the collection and analysis of production fluids from both injection and production wells. The H2S concentration, total microbial population, and microbial community composition were monitored overtime using novel microbial monitoring technique of next generation sequence (NGS). These measurements provided insights into the extent of reservoir souring mitigation achieved by the nitrate injection and the long-term impacts on microbial activity. The results of the pilot study demonstrated the effectiveness of nitrate injection in managing reservoir souring, with significant reductions in H2S concentration observed, indicating successful suppression of SRB activity. Microbial analyses revealed changes in microbial community composition, with a decrease in SRB abundance and an increase in nitrate-reducing bacteria (NRB). These results then further correlate with the changes of produced water composition pre and post injection which indicated reduction in volatile fatty acid (VFA) consumed by NRBs. The findings from this pilot study provide valuable insights into the feasibility and optimization of nitrate injection as a reservoir souring management strategy in mature oil fields. The results can be utilized by oil field operators and engineers to design larger-scale nitrate injection programs and develop mitigation strategies to maintain reservoir productivity, enhance infrastructure integrity, and ensure environmental safety in souring-prone oil field. This paper is a continuation to SPE-216234-MS: Reservoir Souring Management in A Mature Waterflooded Offshore Field Malaysia: Case Study of Field-D that was presented during ADIPEC 2023 in Abu Dhabi as continuation of reservoir souring management at Field-D.
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Jabbar Alrikaby, Nuha, Hasan Azaati Ibadi Abul-Doanej et Zahraa Abbas Habbooshee Al-Jasime. « Mutual Cooperation and Potential Conflicts : The Dynamic Relationship between Helpful Gut Bacteria and Intestinal Parasites in Human Digestive Well-being. A comprehensive review ». Dans X INTERNATIONAL CONGRESS OF PURE AND APPLIED TECHNOLOGICAL SCIENCES. Rimar Academy, 2023. http://dx.doi.org/10.47832/minarcongress10-5.

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A significant number of bacteria residing in the mammalian intestinal tract inhabit the surface of the intestinal lining. These microorganisms serve crucial functions in numerous physiological processes such as digestive and metabolic processes, Control and regulation of the immune system, Utilization of energy, Growth of the mucosal lining, and the preservation of protective barriers (Sun and Chen 2019). The human digestive system hosts a wide range of microorganisms, which encompasses beneficial intestinal microflora and intestinal parasites. This research investigates the intricate relationship between these two groups in the context of human digestive health. While beneficial gut bacteria have a crucial function in aiding digestion as well as maintaining overall health and wellness, intestinal parasites pose a persistent challenge to this delicate balance. Intestinal parasites are a assortment of varied protozoa and worms that can cause a wide range of health problems, specifically in areas with inadequate hygiene and restricted entry to medical care. Efforts to control these infections include both treatment and preventive measures, underscoring the importance of public health initiatives and ongoing research in combatting these parasites. Aim of study: This study examines the fundamental mechanisms that govern the dynamic interaction between beneficial bacteria and intestinal parasites, shedding light on instances of mutual cooperation and potential conflicts. Helpful microbes contribute to absorption of nutrients, control of the body's defense system, and protection from harmful invaders. Conversely, intestinal parasites can disrupt these processes, leading to infections and compromised health. Gaining a deeper understanding of the equilibrium between these microorganisms is essential for comprehending their collective impact on human digestive health. This research investigates the consequences of this interaction, both advantageous and disadvantageous, on overall well-being, and takes into account potential therapeutic approaches to maintain a harmonious gut microbial community. As we navigate the complexities of this dynamic relationship, we gain valuable insights into the preservation and restoration of digestive well-being amidst microbial diversity and potential challenges
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Suriyaarachchi, D. P., W. M. N. D. Ranasinghe, M. K. Dissanayake et C. T. Nugawela. « A Value added sustainable production opportunity out of rice straw to economically uplift rice farming communities ». Dans Awakening the economy through design innovation. Department of Integrated Design, University of Moratuwa, Sri Lanka, 2023. http://dx.doi.org/10.31705/idr.2023.13.

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In the Sri Lankan Agriculture Sector, rural rice cultivation farmers have found the best way of eliminating the highly generating rice straw by direct open field burning due to the high cost of straw collection and management, transportation cost, storage difficulties, shortage of rural labour, cost factors of organic fertiliser making, and lack of adequate methods and technology. These practices have created a number of environmental and social impacts .Increase of heat generation, emission of greenhouse gases, causes damage to micro organisms in the upper soil layer and reduces microbial activities, soil deterioration, damages the air quality and negatively impacts on human health. This experimental project comprised two phases, material development phase and product design phase. The concept was, management through value addition. The project approach was to come up with an effective and creative management solution for the highly- generating rice straw and minimise the current practices by introducing a method to reutilize while coming up with a value addition for the rural rice farming community. The main aim of this project was to improve rural farmers’ livelihoods by fostering sustainable rice straw management into a sustainable paradigm. This experimental project focused on rice straw conversion into value-added material development which was able to create a sustainable product solution for the market while creating a production opportunity for the rural community as a secondary income source. The final goal of the project was to economically uplift the lives of rural farmers by providing an additional income mainly for the non-cultivation period.
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« Exploring wheat genotype influence on microbiome-mediated take-all disease suppression ». Dans Plant Health 2024. American Phytopathological Society, 2024. http://dx.doi.org/10.1094/aps-ph24-027.

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Take-all disease caused by Gaeumannomyces tritici, a fungal root pathogen, significantly impacts wheat production globally. Effective biocontrol for take-all is the buildup of a 2,4-diacetylphloroglucinol-producing Pseudomonas spp, which both antagonizes the pathogen and induces plant disease resistance. Previous work found that wheat genotypes vary in accumulating Pseudomonas spp in the rhizosphere, with those hosting more Pseudomonas spp being more resistant to disease. Here, we aim to identify plant genetic markers associated with this variation. In a greenhouse experiment, we grew two recombinant inbred lines (RILs) known to be segregating for their ability to support disease-suppressive Pseudomonas spp. First, each RIL was grown for three weeks, after which above-ground tissue was removed and the same RIL was re-planted into the same soil for seven cycles. Following the final cycle, we infested the soil with the take-all pathogen to assess take-all severity. Our preliminary results will include disease data from this inoculation effort. We expect that soil from specific RILs will display better defense mechanisms against take-all. Next, we will collect rhizosphere soil samples to characterize bacterial and fungal symbionts, correlating microbial community profiles with disease data against quantitative trait locus (QTL) maps. Understanding how wheat genotypes accumulate protective populations of Pseudomonas and other soil microbes can provide new tools for managing an important disease of this staple food crop.
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Polverino, eva, Catia Cilloniz, Cristina Esquinas, Ernest bragulat, Josep Mensa, Maria Angeles Marcos et A. Torres. « Community-acquired Pneumonia In Outpatients : Microbial Etiology ». Dans American Thoracic Society 2010 International Conference, May 14-19, 2010 • New Orleans. American Thoracic Society, 2010. http://dx.doi.org/10.1164/ajrccm-conference.2010.181.1_meetingabstracts.a3213.

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Rapports d'organisations sur le sujet "Impact on microbial community"

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Fouke, Bruce. Recovery Act : Understanding the Impact of CO2 Injection on the Subsurface Microbial Community in an Illinois Basin CCS Reservoir : Integrated Student Training in Geoscience and Geomicrobiology. Office of Scientific and Technical Information (OSTI), mars 2013. http://dx.doi.org/10.2172/1126699.

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Droby, S., J. L. Norelli, M. E. Wisniewski, S. Freilich, A. Faigenboim et C. Dardick. Microbial networks on harvested apples and the design of antagonistic consortia to control postharvest pathogens. Israel : United States-Israel Binational Agricultural Research and Development Fund, 2020. http://dx.doi.org/10.32747/2020.8134164.bard.

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We have demonstrated, at a global level, the existence of spatial variation in the fungal and bacterial composition of different fruit tissues. The composition, diversity and abundance varied in fruit harvested in different geographical locations and suggests a potential link between location and the type and rate of postharvest diseases that develop in each country. The global core microbiome of apple fruit was determined and found to be represented by several beneficial microbial taxa and accounted for a large fraction of the fruit microbial community. To further characterize apple fruit the microbiome after harvest, a detailed study was performed to evaluate effects of postharvest practices on the composition of the fruit peel. Microbiota. Results of this work conformed our findings that tissue-type is the main factor driving fungal and bacterial diversity and community composition on apple fruit. Both postharvest treatments and low temperature storage had a great impact on the fungal and bacterial diversity and community composition of these tissue types. Distinct spatial and temporal changes in the composition and diversity of the microbiota were observed in response to various postharvest management practices. Our results clearly indicated that apple fruit has a unique core microbiome that is universal. Analysis of the microbiome across Malus species indicates that the microbiome of domesticated apple has a higher diversity and abundance and is an admixture of the microbiome present in its wild progenitors, with clear evidence for introgression. These findings support the existence of co-evolution between Malus species and their microbiome during domestication. A network analysis of the metagenomics data was used to further elucidate functional differences between the microbiome of organic vs. conventional fruit. Our analysis predicted a link between Capnodiales and the degradation of aromatic compounds. Alternaria, a genus in the Capnodiales genus, is one of the main pathogens of stored apple fruit and was also abundant in our samples. The potential role of Alternaria in the degradation of aromatic compounds is in agreement with previous studies indicating a link between Alternaria and the metabolism of the aromatic compound, alphafarnesene38, a key volatile secreted by the fruit during maturation. A greater number of metabolic pathways related to plant defense substances (e.g. terpenoids and alkaloids) were identified in the microbiome of organic fruit samples, while more antibiotic-related metabolic pathways for compounds such as Erythromycin, Avermectin, Ansamycin, and Penicillin were present in the microbiome of apple fruit samples grown using conventional management practices.
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Beck, Aaron. NAPTRAM - Plastiktransportmechanismen, Senken und Interaktionen mit Biota im Nordatlantik / NAPTRAM - North Atlantic plastic transport mechanisms, sinks, and interactions with biota, Cruise No. SO279, Emden (Germany) – Emden (Germany), 04.12.2020 – 05.01.2021. Gutachterpanel Forschungsschiffe Bonn, 2021. http://dx.doi.org/10.3289/cr_so279.

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The coastal and open oceans represent a major, but yet unconstrained, sink for plastics. It is likely that plastic-biota interactions are a key driver for the fragmentation, aggregation, and vertical transport of plastic litter from surface waters to sedimentary sinks. Cruise SO279 conducted sampling to address core questions of microplastic distribution in the open ocean water column, biota, and sediments. Seven stations were sampled between the outer Bay of Biscay and the primary working area south of the Azores. Additional samples were collected from surface waters along the cruise track to link European coastal and shelf waters with the open ocean gyre. Microplastic samples coupled with geochemical tracer analyses will build a mechanistic understanding of MP transport and its biological impact reaching from coastal seas to the central gyre water column and sinks at the seabed. Furthermore, floating plastics were sampled for microbial community and genetic analyses to investigate potential enzymatic degradation pathways. Cruise SO279 served as the third cruise of a number of connected research cruises to build an understanding of the transport pathways of plastic and microplastic debris in the North Atlantic from the input through rivers and air across coastal seas into the accumulation spots in the North Atlantic gyre and the vertical export to its sink at the seabed. The cruise was an international effort as part of the JPI Oceans project HOTMIC (“HOrizontal and vertical oceanic distribution, Transport, and impact of MICroplastics”) and the BMBF funded project PLASTISEA (‘Harvesting the marine Plastisphere for novel cleaning concepts’), and formed a joint effort of HOTMIC and PLASTISEA researchers from a range of countries and institutes.
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Crowley, David E., Dror Minz et Yitzhak Hadar. Shaping Plant Beneficial Rhizosphere Communities. United States Department of Agriculture, juillet 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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Mosher, Jennifer J., Meghan M. Drake, Susan L. Carroll, Zamin K. Yang, Christopher W. Schadt, Stephen D. Brown, Mircea Podar et al. Microbial Community Dynamics of Lactate Enriched Hanford Groundwaters. Office of Scientific and Technical Information (OSTI), mai 2010. http://dx.doi.org/10.2172/986244.

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Gonzalez, Logan, Christopher Baker, Stacey Doherty et Robyn Barbato. Ecological modeling of microbial community composition under variable temperatures. Engineer Research and Development Center (U.S.), février 2024. http://dx.doi.org/10.21079/11681/48184.

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Soil microorganisms interact with one another within soil pores and respond to external conditions such as temperature. Data on microbial community composition and potential function are commonly generated in studies of soils. However, these data do not provide direct insight into the drivers of community composition and can be difficult to interpret outside the context of ecological theory. In this study, we explore the effect of abiotic environmental variation on microbial species diversity. Using a modified version of the Lotka-Volterra Competition Model with temperature-dependent growth rates, we show that environmentally relevant temperature variability may expand the set of temperature-tolerance phenotype pairs that can coexist as two-species communities compared to constant temperatures. These results highlight a potential role of temperature variation in influencing microbial diversity. This in turn suggests a need to incorporate temperature into predictive models of microbial communities in soil and other environments. We recommend future work to parameterize the model applied in this study with empirical data from environments of interest, and to validate the model predictions using field observations and experimental manipulations.
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Hochella, M. F. Microbial Community Acquisition of Nutrients from Mineral Surfaces. Final Report. Office of Scientific and Technical Information (OSTI), juin 2003. http://dx.doi.org/10.2172/824025.

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Wang, Jian, Joy D. Van Nostrand, Zhili He, Liyou Wu, Ye Deng, Xu Zhang, Jizhong Zhou et Guanghe Li. Microarray-based analysis of survival of soil microbial community during ozonation. Office of Scientific and Technical Information (OSTI), mai 2010. http://dx.doi.org/10.2172/986918.

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Perkins, R. E., J. W. Elwood et G. S. Sayler. Detrital microbial community development and phosphorus dynamics in a stream ecosystem. Office of Scientific and Technical Information (OSTI), juin 1986. http://dx.doi.org/10.2172/5691641.

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Temin, Miriam, et Craig Heck. Impact of community-based girl groups. Population Council, 2021. http://dx.doi.org/10.31899/sbsr2021.1015.

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Programs increasingly use community-based girl groups (CBGGs) to address risks and empower adolescent girls, but evidence on their impact is not always accessible to decision makers. A closer look at 30 CBGG programs in low- and middle-income countries found that CBGGs had the greatest reported success in improving health and gender attitudes and beliefs, while their effect on health behavior and status is mixed. Program implementers should consider CBGGs as a way to facilitate girls’ empowerment, with complementary measures to engage community members and to promote enabling environments for greater program impact. Increased interest and investment in CBGGs should be supported by greater investment in further research to bolster the evidence base.
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