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Добірка наукової літератури з теми "MICROBIALLY"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "MICROBIALLY"

Allsup, Cassandra M., Isabelle George, and Richard A. Lankau. "Shifting microbial communities can enhance tree tolerance to changing climates." Science 380, no. 6647 (May 26, 2023): 835–40. http://dx.doi.org/10.1126/science.adf2027.

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Climate change is pushing species outside of their evolved tolerances. Plant populations must acclimate, adapt, or migrate to avoid extinction. However, because plants associate with diverse microbial communities that shape their phenotypes, shifts in microbial associations may provide an alternative source of climate tolerance. Here, we show that tree seedlings inoculated with microbial communities sourced from drier, warmer, or colder sites displayed higher survival when faced with drought, heat, or cold stress, respectively. Microbially mediated drought tolerance was associated with increased diversity of arbuscular mycorrhizal fungi, whereas cold tolerance was associated with lower fungal richness, likely reflecting a reduced burden of nonadapted fungal taxa. Understanding microbially mediated climate tolerance may enhance our ability to predict and manage the adaptability of forest ecosystems to changing climates.

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Wang, Dongsheng, Fang Guan, Chao Feng, Krishnamurthy Mathivanan, Ruiyong Zhang, and Wolfgang Sand. "Review on Microbially Influenced Concrete Corrosion." Microorganisms 11, no. 8 (August 12, 2023): 2076. http://dx.doi.org/10.3390/microorganisms11082076.

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Microbially influenced concrete corrosion (MICC) causes substantial financial losses to modern societies. Concrete corrosion with various environmental factors has been studied extensively over several decades. With the enhancement of public awareness on the environmental and economic impacts of microbial corrosion, MICC draws increasingly public attention. In this review, the roles of various microbial communities on MICC and corresponding protective measures against MICC are described. Also, the current status and research methodology of MICC are discussed. Thus, this review aims at providing insight into MICC and its mechanisms as well as the development of protection possibilities.

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Pacton, M., S. F. M. Breitenbach, F. A. Lechleitner, A. Vaks, C. Rollion-Bard, O. S. Gutareva, A. V. Osintcev, and C. Vasconcelos. "The role of microorganisms in the formation of a stalactite in Botovskaya Cave, Siberia – paleoenvironmental implications." Biogeosciences 10, no. 9 (September 27, 2013): 6115–30. http://dx.doi.org/10.5194/bg-10-6115-2013.

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Abstract. Calcitic speleothems in caves can form through abiogenic or biogenic processes, or through a combination of both. Many issues conspire to make the assessment of biogenicity difficult, especially when focusing on old speleothem deposits. This study reports on a multiproxy analysis of a Siberian stalactite, combining high-resolution microscopy, isotope geochemistry and microbially enhanced mineral precipitation laboratory experiments. The contact between growth layers in a stalactite exhibits a biogenic isotopic signature; coupled with morphological evidence, this supports a microbial origin of calcite crystals. SIMS δ13C data suggest that microbially mediated speleothem formation occurred repeatedly at short intervals before abiotic precipitation took over. The studied stalactite also contains iron and manganese oxides that have been mediated by microbial activity through extracellular polymeric substance (EPS)-influenced organomineralization processes. The latter reflect paleoenvironmental changes that occurred more than 500 000 yr ago, possibly related to the presence of a peat bog above the cave at that time. Microbial activity can initiate calcite deposition in the aphotic zone of caves before inorganic precipitation of speleothem carbonates. This study highlights the importance of microbially induced fractionation that can result in large negative δ13C excursions. The microscale biogeochemical processes imply that microbial activity has only negligible effects on the bulk δ13C signature in speleothems, which is more strongly affected by CO2 degassing and the host rock signature.

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Pacton, M., S. F. M. Breitenbach, F. A. Lechleitner, A. Vaks, C. Rollion-Bard, O. S. Gutareva, A. V. Osinzev, and C. Vasconcelos. "The role of microorganisms on the formation of a stalactite in Botovskaya Cave, Siberia – palaeoenvironmental implications." Biogeosciences Discussions 10, no. 4 (April 8, 2013): 6563–603. http://dx.doi.org/10.5194/bgd-10-6563-2013.

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Abstract. Calcitic speleothems in caves can form through abiogenic, biogenic, or a combination of both processes. Many issues conspire to make the assessment of biogenicity difficult, especially when focusing on old speleothem deposits. This study reports a multiproxy analysis of a Siberian stalactite, combining high-resolution microscopy, isotope geochemistry and microbially enhanced mineral precipitation laboratory experiments. The contact between growth layers in a stalactite exhibits a biogenic isotopic signature; coupled with morphological evidence this supports a microbial origin of calcite crystals. SIMS δ13C data suggest that microbially mediated speleothem formation occurred repeatedly for short intervals before abiotic precipitation took over. The studied stalactite also contains iron and manganese oxides that have been mediated by microbial activity through extracellular polymeric substances (EPS)-influenced organomineralization processes. The latter reflect palaeoenvironmental changes that occurred more than 500 000 yr ago, possibly related to the presence of a peat bog above the cave at that time. Microbial activity can initiate calcite deposition in the aphotic zone of caves before inorganic precipitation of speleothem carbonates. This study highlights the importance of microbially induced fractionation that can result in large negative δ13C excursions. The micro-scale biogeochemical processes imply that microbial activity has only negligible effects on the bulk δ13C signature in speleothems, which is more strongly affected by CO2 degassing and the hostrock signature.

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Schindler, Frank, Lutz Merbold, Stefan Karlsson, Anna Rosa Sprocati, and Erika Kothe. "Seasonal change of microbial activity in microbially aided bioremediation." Journal of Geochemical Exploration 174 (March 2017): 4–9. http://dx.doi.org/10.1016/j.gexplo.2016.04.001.

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Jiang, Weijian, Wen Yi, and Lei Zhou. "Fibre-Microbial Curing Tests and Slope Stability Analysis." Applied Sciences 13, no. 12 (June 12, 2023): 7051. http://dx.doi.org/10.3390/app13127051.

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In response to the deformation resistance deficiency and poor toughness characteristics of soil after microbial curing, a combination of fibre reinforcement technology and microbial curing technology was used to conduct microbial curing tests using basalt fibres and denitrifying bacteria. In this paper, the effects of fibre on the strength and toughness of soil consolidation were analysed by unconfined compressive strength test and direct shear test, and the stability of reinforced slope was analysed by numerical simulation. The results show the following. (1) Basalt fibre can effectively improve the characteristics of brittle damage of microbially consolidated soil while increasing the compressive and shear strength. (2) Fibre dosing and fibre length have important effects on the mechanical properties of microbially consolidated soil. (3) The appropriate amount of basalt fibre can promote the generation of calcium carbonate. (4) The plastic strain area of the slope decreases after microbial reinforcement and the maximum equivalent plastic stress decreases by 65 kPa.

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Emmert, Simon, Katherine Davis, Robin Gerlach, and Holger Class. "The Role of Retardation, Attachment and Detachment Processes during Microbial Coal-Bed Methane Production after Organic Amendment." Water 12, no. 11 (October 27, 2020): 3008. http://dx.doi.org/10.3390/w12113008.

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Microbially enhanced coal-bed methane could allow for a more sustainable method of harvesting methane from un-mineable coaldbeds. The model presented here is based on a previously validated batch model; however, this model system is based on upflow reactor columns compared to previous experiments and now includes flow, transport and reactions of amendment as well as intermediate products. The model implements filtration and retardation effects, biofilm decay, and attachment and detachment processes of microbial cells due to shear stress. The model provides additional insights into processes that cannot be easily observed in experiments. This study improves the understanding of complex and strongly interacting processes involved in microbially enhanced coal-bed methane production and provides a powerful tool able to model the entire process of enhancing methane production and transport during microbial stimulation.

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Polgári, Márta, Ildikó Gyollai, Szaniszló Bérczi, Miklós Veres, Arnold Gucsik, and Pál-Molnár Elemér. "Microbial mediation of textures and minerals – terrestrial or parent body processes?" Open Astronomy 28, no. 1 (January 1, 2019): 40–60. http://dx.doi.org/10.1515/astro-2019-0004.

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Abstract Evolution of chondritic parent body is influenced by thermal, impact metamorphism and aqueous alteration, studied in Mező-Madaras, Knyahinya, Mócs and Nyírábrány in aspect of high resolution in situ textural, mineralogical and organic geochemical characteristics, using optical microscopy, FTIR-ATR and Raman spectroscopy. Our observations focused on Fe-containing opaque grains, glass, olivines and pyroxenes, which were well populated by micrometer-sized microbial filamentous elements in their boundary region within matrix and inside the minerals resembling mineralized microbially produced textures (MMPT), affecting 70-80 vol% of samples. In MMPT iron oxides (ferrihydrite, goethite), olivine, montmorillonite, kandite minerals and various hydrocarbon compounds were identified. (1) Data confirmed dense and invasive terrestrial microbially mediated contamination in the chondrites, supported by microtexture, micromineralogy and embedded organic compounds. As the classical transformation processes are supposed nowadays to have been happened on the parent bodies, a contradiction arose: how could it be that these classical products are manifested in microbially mediated texture? (2) Based on terrestrial analogies, microbial mediation is a sudden process comparing to geological times, very ancient, widespread and occur in various environments under determined conditions. It can consume previous and also produce new minerals. After formation, MMPT can survive billions of years proposing occurrence on parent bodies.

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Bosak, Tanja, Giulio Mariotti, Francis A. MacDonald, J. Taylor Perron, and Sara B. Pruss. "Microbial Sedimentology of Stromatolites in Neoproterozoic Cap Carbonates." Paleontological Society Papers 19 (October 2013): 51–76. http://dx.doi.org/10.1017/s1089332600002680.

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Stromatolite shapes, sizes, and spacings are products of microbial processes and interactions with topography, sedimentation, and flow. Laboratory experiments and studies of modern microbial mats and sediments can help reconstruct processes that shaped some typical stromatolite forms and some atypical microbially influenced sediments from Neoproterozoic cap carbonates. Studies of modern, cohesive microbial mats indicate that microbialaminite facies in the lower Rasthof Formation (Cryogenian) formed in the presence of very low flow and were not deformed by strong waves or currents. Giant wave ripples, corrugated stromatolites, and tube-hosting stromatolites in basal Ediacaran cap carbonates record interactions between microbes, flow, and evolving bedforms. Preferential cementation in and close to the giant ripple crests is attributed to interactions between flow and local topography. These interactions pumped alkaline porewaters into ripple crests and helped nucleate elongated stromatolites. The similar textures of giant wave ripples and elongated, corrugated, and tube-hosting stromatolites suggest growth in the presence of organic-rich, rounded particles and microbial mats, and in flow regimes that permitted mat growth. These hypotheses can be tested by experiments and models that investigate lithification and the macroscopic morphology of microbial mats as a function of the flow regime, preexisting topography, redox-stratification in sediments, and delivery of organic-rich particles. The widespread microbially influenced textures in Cryogenian microbialaminites and basal Ediacaran cap dolostones record a strong reliance of carbonate deposition on the presence of organic nuclei, supporting carbonate accumulation rates comparable to those in modern reefs. Therefore, the unusual macroscopic morphologies of microbially influenced facies in Neoproterozoic cap carbonates may not reflect oceans that were greatly oversaturated with respect to carbonate minerals.

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Zhu, Xiang Y., John Lubeck, and John J. Kilbane. "Characterization of Microbial Communities in Gas Industry Pipelines." Applied and Environmental Microbiology 69, no. 9 (September 2003): 5354–63. http://dx.doi.org/10.1128/aem.69.9.5354-5363.2003.

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ABSTRACT Culture-independent techniques, denaturing gradient gel electrophoresis (DGGE) analysis, and random cloning of 16S rRNA gene sequences amplified from community DNA were used to determine the diversity of microbial communities in gas industry pipelines. Samples obtained from natural gas pipelines were used directly for DNA extraction, inoculated into sulfate-reducing bacterium medium, or used to inoculate a reactor that simulated a natural gas pipeline environment. The variable V2-V3 (average size, 384 bp) and V3-V6 (average size, 648 bp) regions of bacterial and archaeal 16S rRNA genes, respectively, were amplified from genomic DNA isolated from nine natural gas pipeline samples and analyzed. A total of 106 bacterial 16S rDNA sequences were derived from DGGE bands, and these formed three major clusters: beta and gamma subdivisions of Proteobacteria and gram-positive bacteria. The most frequently encountered bacterial species was Comamonas denitrificans, which was not previously reported to be associated with microbial communities found in gas pipelines or with microbially influenced corrosion. The 31 archaeal 16S rDNA sequences obtained in this study were all related to those of methanogens and phylogenetically fall into three clusters: order I, Methanobacteriales; order III, Methanomicrobiales; and order IV, Methanosarcinales. Further microbial ecology studies are needed to better understand the relationship among bacterial and archaeal groups and the involvement of these groups in the process of microbially influenced corrosion in order to develop improved ways of monitoring and controlling microbially influenced corrosion.

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Більше джерел

Дисертації з теми "MICROBIALLY"

Li, Kwan (Kwan Hon). "Microbially influenced corrosion in sour environments." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/88382.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 119-123).
Microbially influenced corrosion (MIC) is a costly and poorly understood source of corrosion that plagues many modern industrial processes such as oil extraction and transportation. Throughout the years, many possible mechanisms for MIC have been proposed. One specific proposed mechanism was tested in this thesis: that the metal-binding characteristic of bacterial biofilms enhanced corrosion when it appears in conjunction with an iron sulfide film. Two model biogels were used: calcium alginate, which has this metal-binding property, and agarose, which does not. In pursuit of this hypothesis, iron sulfide films were grown on mild steel coupons. Two distinct forms of iron sulfides were grown: a loose black product at low sulfide concentrations, and an adherent gold product at high sulfide concentrations. Many materials characterization techniques were attempted, and the black corrosion product was found to be a mixture of greigite and marcasite. However, this composition was observed to change irreversibly with the application of a laser that caused the material to either heat and/or dry. The resulting golden-colored corrosion product was found to consist mainly of monosulfides, implying the presence of mackinawite or pyrrhotite. By using electrochemical polarization experiments, it was found that calcium alginate enhanced the rate of corrosion; agarose reduced the rate of corrosion. This is in contrast to previously published literature. Contrary to the initial hypothesis, adding an underlying iron sulfide film did not appreciably alter the measured rate of corrosion. Additionally, it was found that biofilms generated by sulfate-reducing bacteria (SRB) enhanced corrosion in a manner similar to the calcium alginate gel, and lysing the cells within the biofilm did nothing to alter this effect. This implies that the biofilm itself, even in the absence of active bacterial metabolic activity, can enhance corrosion rates observed in MIC.
by Kwan Li.
S.M.

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Montross, Scott Norman. "Geochemical evidence for microbially mediated subglacial mineral weathering." Thesis, Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/montross/MontrossS0507.pdf.

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Interactions between dilute meltwater and fine-grained, freshly comminuted debris at the bed of temperate glaciers liberate significant solute. The proportions of solute produced in the subglacial environment via biotic and abiotic processes remains unknown, however, this work suggests the biotic contribution is substantial. Laboratory analyses of microbiological and geochemical properties of sediment and meltwater from the Haut Glacier d\'Arolla (HGA) indicates that a metabolically active microbial community exists in water-saturated sediments at the ice-bedrock interface. Basal sediment slurries and meltwater were incubated in the laboratory for 100 days under near in situ subglacial conditions. Relative proportions of solute produced via abiotic v. biotic mineral weathering were analyzed by comparing the evolved aqueous chemistry of biologically active (live) sediment slurries with sterilized controls. Aqueous chemical analyses indicate an increase in solute produced from mineral weathering coupled with nitrate depletion in the biologically active slurries compared with the killed controls. These results infer that microbial activity at HGA is likely an important contributor to chemical weathering associated solute fluxes from the glaciated catchment. Due to the magnitude of past glaciations throughout geologic time (e.g., Neoproterozoic and Late-Pleistocene), and evidence that subglacial microbial activity impacts mineral weathering, greater consideration needs to be given to cold temperature biogeochemical weathering and its impact on global geochemical cycles.

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Lu, Xinxin. "Microbially Mediated Transformation of Dissolved Nitrogen in Aquatic Environments." Kent State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=kent1429540424.

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Porter, Hannah Elizabeth. "Stabilisation of Geomaterials using Microbially Induced Calcium Carbonate Precipitation." Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/75981.

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The Australian landscape has a large number of naturally cemented structures, which provide inspiration for a sustainable cementing material which does not produce carbon dioxide during the manufacturing phase. Structures such as corals, beach rocks and stromatolites are cemented through the process of Microbially Induced Calcium Carbonate Precipitation, (MICP). This thesis reports on the potential for MICP as a replacement or augmentation to chemical binders in geomaterials and evaluates the sustainability of MICP using Life Cycle Analysis.

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Asare, Noble Kwame. "Microbially-mediated methyl iodide cycling in a particle-rich estuary." Thesis, University of Plymouth, 2007. http://hdl.handle.net/10026.1/2611.

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The dynamics of aquatic systems (e.g. estuarine systems) are known to facilitate the formation of particle aggregates. These nutrient-rich particulate matter provide suitable substrate for bacteria colonization. Although bacteria-aggregate association is known to result in the degradation of particulate organic matter (POM) in aquatic systems, it has never been attributed to the production of methyl iodide (CH3I) (an environmentally important biogas that has the potential to impact on atmospheric chemistry). From literature, there are evidences which suggest that, certain bacteria (methylotrophs) are capable of oxidizing methyl halides including CH3I. Therefore this study investigates microbial production and removal of CH3I in estuarine water through their association with aggregates and assesses the effect of physicochemical variables on bacterial-mediated production and removal of CH3I. From the study, bacteria-aggregate processes were found to elevate the concentration of CH3I between 15-22% of the total observed CH3I concentration over the study period. Aggregate-attached bacteria which were estimated to represent about 17% of the total bacteria population were responsible for about 37% of the overall bacterial activity. To investigate bacterial-mediated removal of CH3I in estuarine systems, a reliable and reproducible method through adaptations and modifications of existing methods was developed. This method involved the use of [14C] radiolabelled CH3I to estimate bacterial utilization of CH3I. The application of the method confirmed the removal of CH3I by methylotrophs in estuarine water with the total recorded amount in bacterial cells and oxidized C02 ranging between 9.3 - 24.5% (depending on the amount of the added substrate). However, this could only represent the potential microbial CH3I removal in the natural aquatic environment. An investigation into spatial and temporal trends in bacterial-mediated removal of CH3I in the Tamar estuary revealed no significant spatial variation but rather a strong seasonality in methylotrophic bacterial CH3I removal. Spatial trends in CH3I removal was found to be mostly influenced by temperature, bacterial abundance and dissolved oxygen concentration whilst the seasonality in the estuary was influenced by temperature, bacterial abundance, suspended particulate matter (SPM) and CH3I concentration. Temperature was identified to be the single most influential physicochemical variable on both spatial and seasonal variation in bacterial CH3I removal in the Tamar estuary. CH3I concentration along the Tamar estuary was also investigated and using this data the total water to air flux of CH3I over the estuary was estimated to be 0.31 x 10³ g yˉ¹. From this study, it was apparent that bacteria activity in estuarine systems is potentially an important source of CH3I in the aquatic environment when associated with aggregates or as sink of CH3I through methylotrophic activity in estuaries.

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Leitholf, Andrew M. "Iron Cycling In Microbially Mediated Acid Mine Drainage Derived Sediments." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1434976163.

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Cheng, Liang. "Innovative ground enhancement by improved microbially induced CaCO3 precipitation technology." Thesis, Cheng, Liang (2012) Innovative ground enhancement by improved microbially induced CaCO3 precipitation technology. PhD thesis, Murdoch University, 2012. https://researchrepository.murdoch.edu.au/id/eprint/15329/.

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The possibility of using microbiological processes to improve the mechanical properties of soil by undisturbed in-situ application has gained attention over recent years. This study has contributed to the technology of biocement, based on microbially induced carbonate precipitation (MICP), for the purpose of soil reinforcement application. MICP involves both the hydrolysis of urea by bacterial urease enzyme and calcium carbonate precipitation in the presence of dissolved calcium ions. Other previously published approaches were based on saturated flow (submersed flow), which is accomplished by pumping solutions from an injection point to a recovery point which is limited exclusively to water saturated soil. This work describes a new variation of in-situ soil reinforcement technology by using surface percolation via – for example – spray irrigation onto dry, free draining ground, such as dunes or dykes. In order to accomplish bacterial immobilization by surface percolation, it was necessary to alternately percolate bacterial suspension and cementation solution (CaCl2 and urea) to form sequential solution layers within the sand columns. By allowing Ca2+ ions diffusion between each layer bacterial immobilization could be enhanced from 30% to 80%. For a limited number of about 3 to 4 treatments this novel application method of cementation allowed homogeneous strength over the depth of the entire 1 m sand column. Although the strength was homogenous, CaCO3 analysis showed that about 3 times less crystals were precipitated in the top layer compared to the bottom layers suggesting differences in efficiency of the calcite crystal to provide strength. This work demonstrated that this efficiency of calcite crystals was related to the pore water content of the continuously drained column with less water content enabling more efficient strength formation. The geotechnical properties of bio-cemented sand samples under different degrees of saturation confirmed that higher strength could be obtained at lower degrees of saturation. To our knowledge, this study was the first study to demonstrate that the calcite crystals formed under a lower degree of saturation had more crystals formed in the contact points, contributing to the strength of the cemented samples. These preferred crystal formation was caused by the retained cementation solution situated in the form of menisci between sand particles at low degree of saturation. Scanning electron microscopy supported the idea that lower water contents lead to selective positioning of crystals at the bridging points between sand grains. After biocementation treatment, fine sand samples exhibited significant increase in cohesion from 1.1 to 280 kPa and friction angle from 23o to 41o. Similar improvements were also obtained for coarse sand samples. Overall, fine sand sample indicated higher cohesion but lower friction angle than coarse sand samples having similar CaCO3 content. The performance of cementation in large (2 m) laboratory scale trials indicated that subsequent treatments of more 4 times in fine sand caused clogging close to the injection end, resulting in limited cementation depth less than 1 m. This clogging problem was not observed in the 2 m treated coarse sand column, which had strength varying between 850 to 2067 kPa. This showed that the surface percolation technology was more applicable for coarse sand soil. The laboratory large scale application (80 L) of fine sand cementation indicated that relatively homogenous cementation in the horizontal direction could be achieved with 80% of cemented sand having strength between 2 to 2.5 MPa. This suggested that although the liquid infiltration flow paths could not be controlled in the surface percolation method, self-adjusting flow paths were triggered by the changed internal flow resistance caused by the precipitated crystals, favoring the homogeneous cementation. A simple mathematical model demonstrated that the cementation depth is dependent on the infiltration rate of cementation solution and the immobilized urease activity. Higher infiltration rate and lower urease activity will enable in deeper cementation. The model also predicted that repeated treatments will enhance sand clogging close to the injection point. The traditional production of ureolytic bacteria used for biocementation is very expensive, because of strictly sterile processing. This study described the sustainable, non-sterile production of urease enzyme using activated sludge as inoculum. By using selective conditions (high pH and high ammonia concentration) for the target ureolytic bacteria plus the presence of urea as the enzyme substrate, highly active ureolytic bacteria, physiologically resembling Bacillus pasteurii were enriched and continuously produced from chemostat operation of the bioreactor. When using a pH of 10, and about 0.17 M urea in a yeast extract based medium ureolytic bacteria developed under aerobic chemostat operation at hydraulic retention times of about 10 h with urease levels of about 60 U/ml culture. This activity is six times higher than required for successful biocementation. The protein rich yeast extract medium could be replaced by commercial milk powder or by lysed activated sludge, which could make the industrial production less costly. A method of in-situ production of urease activity was developed. This method involved providing selective growth medium to allow ureolytic bacteria to proliferate and produce urease activity in-situ of sand column. The aerobic ureolytic bacteria inoculum could only be enriched in unsaturated coarse sand column, where sufficient oxygen was available. However, high urease activities of 20 and 10 U/mL were obtained by growing soil bacteria under aerobic and anaerobic conditions respectively. The successful enrichment of highly urease active bacteria under anaerobic conditions could allow the in-situ production of urease activity at water logged soils. The in-situ produced urease activities by the enriched soil ureolytic bacteria were sufficient to allow successful cementation of fine (>500 kPa) and coarse (>1000 kPa) sand columns. The strength and CaCO3 analysis indicated that the common obstacle of surface clogging in deeper fine sand column was avoided, explained by avoiding bacterial accumulation at the top of the column. In combination, all findings of the present study imply that the cost of MICP technology can be reduced by optimizing the conditions for effective crystals precipitation by providing low saturation conditions when the cementation is operated. The cost reduction can also be achieved by producing urease activity more economically by omitting the requirement of sterilization (non-sterile cultivation) and bioreactor (in-situ growth). These are expected to make this technology more readily acceptable for field applications.

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Arthur, Mickey Francis. "Soils containing 2,3,7,8-tetrachlorodibenzo-p-dioxin : aspects of their microbial activity and the potential for their microbially-mediated decontamination /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487330761218489.

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Dawoud, Osama M. F. "The applicability of microbially induced calcite precipitation (MICP) for soil treatment." Thesis, University of Cambridge, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709509.

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Doloman, Anna. "Optimization of Biogas Production by Use of a Microbially Enhanced Inoculum." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7531.

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A renewable energy source, biogas, comprises of methane (80%) and carbon dioxide (15%), and is a great alternative to the conventional fossil-based fuels, such as coal, gas and oil. Biogas is created during anaerobic biological digestion of waste materials, such as landfill material, animal manure, wastewater, algal biomass, industrial organic waste etc. A biogas potential from organic waste in the United States is estimated at about 9 million tons per year and technology allows capture of greenhouse gases, such as methane and carbon dioxide, into a form of a fuel. In the light of global climate change and efforts to decrease carbon footprint of fuels in daily life, usage of biogas as an alternative fuel to fossil fuels looks especially promising. The goal of this research was to develop and test an approach for optimization of biogas production by engineering microorganisms digesting organic waste. Specifically, bacteria that can digest algal biomass, collected from the wastewater lagoons or open waterbodies. The research also expands on the previous efforts to analyze microbial interactions in wastewater treatment systems. A computational model is developed to aid with prognosis of microbial consortia ability to form complex aggregates in reactors with upflow mode of feeding substrate. Combining modeling predictions and laboratory experiments in organic matter digestion will lead to more stable engineered systems and higher yields of biogas.

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Книги з теми "MICROBIALLY"

Heitz, E., H. C. Flemming, and W. Sand, eds. Microbially Influenced Corrosion of Materials. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80017-7.

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Singh, Ajay K. Microbially Induced Corrosion and its Mitigation. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8019-2.

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Basnak, Gabriella. Microbially enhanced chemisorption of heavy metals(MECHM). Birmingham: University of Birmingham, 1998.

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Middleton, Andrew Clyde. Microbially mediated dissimilatory sulfate reduction: Kinetics and environmental significance. Ann Arbor, MI: Xerox University Microfilms, 1990.

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Haq, Humara. Investigations of proteinase inhibitors and modifications to microbially produced cellulose. Birmingham: University of Birmingham, 1994.

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D, Thierry, Institute of Materials (Great Britain), and European Federation of Corrosion, eds. Aspects of microbially induced corrosion: Papers from EUROCORR '96 and the EFC Working Party on Microbial Corrosion. London: Published for the European Federation of Corrosion by the Institute of Materials, 1997.

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Nice, France) EUROCORR (1996. Aspects of microbially induced corrosion: Papers from EUROCORR '96 and the EFC Working Party on Microbial Corrosion. London: Institute of Materials, 1997.

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Visser, S. Effects of acid-forming emissions on soil microorganisms and microbially-mediated processes. Calgary: Acid Deposition Research Program, 1987.

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Visser, S. Effects of acid-forming emissions on soil microorganisms and microbially-mediated processes. Calgary, AB: Acid Deposition Research Program, 1987.

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Shoesmith, David William. The resistance of titanium to pitting, microbially induced corrosion in unsaturated conditions. Pinawa, Man: AECL, Whiteshell Laboratories, 1997.

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Частини книг з теми "MICROBIALLY"

Haug, Roger Tim. "Microbially Induced Corrosion." In Lessons in Environmental Microbiology, 658–69. Boca Raton : Taylor & Francis, 2019.: CRC Press, 2019. http://dx.doi.org/10.1201/9780429442902-20.

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Gupta, Indarchand, Alka Yadav, Avinash P. Ingle, Silvio Silverio da Silva, Chistiane Mendes Feitosa, and Mahendra Rai. "Microbially Synthesized Nanoparticles." In Microbial Nanotechnology, 288–300. Boca Raton: CRC Press, [2020]: CRC Press, 2020. http://dx.doi.org/10.4324/9780429276330-15.

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Glasauer, Susan. "Nanocrystals, Microbially Induced." In Encyclopedia of Geobiology, 681–84. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-1-4020-9212-1_155.

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Noffke, Nora. "Microbially Induced Sedimentary Structures." In Encyclopedia of Astrobiology, 1045–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_1004.

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Noffke, Nora. "Microbially Induced Sedimentary Structures." In Encyclopedia of Astrobiology, 1565–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_1004.

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Ramadan, Mohamed M., Asran-Amal, Hassan Almoammar, and Kamel A. Abd-Elsalam. "Microbially Synthesized Biomagnetic Nanomaterials." In Nanotechnology in the Life Sciences, 49–75. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16439-3_4.

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Sharma, Mohita, and Priyangshu M. Sarma. "Microbially Mediated Electrosynthesis Processes." In Microbial Fuel Cell, 421–42. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66793-5_22.

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Paddon, Christopher J., Derek McPhee, Patrick J. Westfall, Kirsten R. Benjamin, Douglas J. Pitera, Rika Regentin, Karl Fisher, Scott Fickes, Michael D. Leavell, and Jack D. Newman. "Microbially Derived Semisynthetic Artemisinin." In Isoprenoid Synthesis in Plants and Microorganisms, 91–106. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4063-5_7.

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Bosak, Tanja. "Calcite Precipitation, Microbially Induced." In Encyclopedia of Geobiology, 223–27. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-1-4020-9212-1_41.

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Noffke, Nora. "Microbially Induced Sedimentary Structures." In Encyclopedia of Astrobiology, 1–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-642-27833-4_1004-5.

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Тези доповідей конференцій з теми "MICROBIALLY"

Rogers, Robert D., Melinda A. Hamilton, and Lee O. Nelson. "Microbially influenced degradation of concrete structures." In Non-Destructive Evaluation Techniques for Aging Infrastructure & Manufacturing, edited by Walter G. Reuter. SPIE, 1998. http://dx.doi.org/10.1117/12.302525.

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Wood, Jonathan M., and Iain S. C. Spark. "Microbially Induced Formation Damage in Oilfield Reservoirs." In SPE International Symposium on Formation Damage Control. Society of Petroleum Engineers, 2000. http://dx.doi.org/10.2118/58750-ms.

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Ngoma, M. C., O. Kolawole, M. B. Elinski, R. Thomas, and R. LaGrand. "Sub-Core Scale Characterization of Microbial Invasion Impact in Carbonates: Implications for Mechanical Alteration." In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0064.

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ABSTRACT Biogeomechanics is a novel and resourceful approach to assessing the impact of biological processes on the mechanical properties and behavior of rocks and rock-like materials. However, there is still a lack of knowledge on how far an in-situ bacterial growth can invade a reservoir rock with time and what its long-term impacts at nano- to micro-scale are in the invaded reservoir. This study uses non-destructive methods to investigate time-dependent nano-scale extent of biogeomechanical and morphological alterations in carbonate rocks due to microbial invasion. We conducted a microbial treatment of carbonate rock samples using a distinct microbial solution over a period of 30, 60, 90, and 120 days at a temperature of 42°C. Subsequently, the sub-core scale properties of untreated and post-treatment carbonate rocks were measured using Atomic Force Microscope (AFM) and Scanning Electron Microscope (SEM) to assess the changes in surface roughness and pore structure. Finally, we compared the untreated and microbially treated samples and assessed the implications for mechanical properties to better understand how microbial invasion could impact carbonate rocks. The results suggest that distinct microbes can continue to invade and alter the formation over time causing dissolution and disintegration of the rock matrix, which may yield a reduction in the mechanical integrity of the microbially impacted carbonate rock. INTRODUCTION Interaction between rocks and fluids can have multiple effects on its mechanical and mineralogical properties. Several studies have previously investigated the potential applications of these property changes in various fields such as the control of seepage in underground excavations (Phillips et al., 2013), geological CO2 storage (Kolawole et al., 2021a; Kolawole et al., 2022a), enhanced hydrocarbon recovery (Nikolova & Gutierrez, 2020; Kolawole et al., 2022b), wellbore cement integrity after exposure to corrosive environments (Kirkland et al., 2020; Kolawole et al., 2021b), and many other engineering-related processes. For example, in one study, researchers evaluated the grouting of rock fractures characterized by a fine-scale aperture with calcium carbonate due to microbial activity (Minto et al., 2016). This microbe was used for the treatment of samples over 12 days, and the results showed that the hydraulic aperture was reduced (Minto et al., 2016).

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Maxwell, Stephen. "Predicting Microbially Influenced Corrosion in Seawater Injection Systems." In SPE International Oilfield Corrosion Symposium. Society of Petroleum Engineers, 2006. http://dx.doi.org/10.2118/100519-ms.

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Hassan, Najlaa, Azadeh Farzaneh, Gary Pertmer, Paul Rostron, Dianne Poster, Joey Robertson, and Mohamad Al-Sheikhly. "Chemical and microbially-induced corrosion in petroleum pipelines." In RDPETRO 2018: Research and Development Petroleum Conference and Exhibition, Abu Dhabi, UAE, 9-10 May 2018. American Association of Petroleum Geologists, Society of Exploration Geophysicists, European Association of Geoscientists and Engineers, and Society of Petroleum Engineers, 2018. http://dx.doi.org/10.1190/rdp2018-50000017.1.

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Bucci, Nicholas A., Ehsan Ghazanfari, and Huijie Lu. "Microbially-Induced Calcite Precipitation for Sealing Rock Fractures." In Geo-Chicago 2016. Reston, VA: American Society of Civil Engineers, 2016. http://dx.doi.org/10.1061/9780784480144.055.

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Zhang, Xu, R. M. Knapp, and M. J. McInerney. "A Mathematical Model for Microbially Enhanced Oil Recovery Process." In SPE/DOE Enhanced Oil Recovery Symposium. Society of Petroleum Engineers, 1992. http://dx.doi.org/10.2118/24202-ms.

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Xu, Xichen, Hongtao Wang, Wenbin Lin, Xiaohui Cheng, and Hongxian Guo. "Desert Aeolian Sand Cementation via Microbially Induced Carbonate Precipitation." In International Foundations Congress and Equipment Expo 2021. Reston, VA: American Society of Civil Engineers, 2021. http://dx.doi.org/10.1061/9780784483411.027.

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Lewicka, D., and A. Pfennig. "Abiotic and microbially influenced corrosion on buried iron artefacts." In STREMAH 2013. Southampton, UK: WIT Press, 2013. http://dx.doi.org/10.2495/str130321.

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Pandey, R., T. Sohail, A. I. Ajibona, and S. Saurabh. "Molecular Dynamics Insights into Bioconversion Induced Matrix Strain." In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0785.

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ABSTRACT The total annual US consumption of natural gas is expected to surpass 40 trillion cubic feet in the coming years. Microbially enhanced coalbed methane (MECBM) aims to replicate naturally occurring microbial pathways to generate methane from in-situ coal. In a basic gamut of lab-characterization experiments investigating properties of coal as a reservoir, it was revealed microbial treatment of coal results in swelling of the coal matrix. Bio-strains in the matrix result in changes in connected porosity, and its stress-state which governs the flow behavior throughout the life of the producing reservoir. Use of molecular dynamics (MD) enables us to utilize the bio-strain data to understand the dynamic stress-state development in a MECBM reservoir. The Wiser coal molecule was used as the representative molecule, whose reactive potential was minimized using PCFF. The stable MD system enables application of strain, which enables the analysis of internal stresses. Results indicated internal stresses developed during bioconversion exceeded the Von Mises failure criterion for the sample tested in the laboratory under hydrostatic pressure (0.2 MPa). However, the internal stresses for sample under in-situ stress regimes was suppressed, far from the tensile failure conditions. INTRODUCTION AND BACKGROUND There has been a sustained increase in the demand for clean energy sources such as hydrogen and methane, especially as the world works towards meeting sustainable climate goals (Jun et al., 2016). Natural gases like methane have lower carbon footprint, as it generates approximately 50% of the carbon when compared to burning oil and coal for electricity generation (Tollefson, 2012). As such, natural gases are set to go up in production rates to meet environmental demands. Recent data indicates that the world demand for natural gas is expected to increase till 2045, with a significant portion of this demand to be met by increasing production from unconventional resources, such as coalbed methane (CBM) (Birol, 2017; Gonzales, 2021; IEA, 2022). CBM refers to naturally occurring methane extracted from coal and coal seams, which is an unconventional source of natural gas (Haldar, 2018). However, to meet the increasing demand for natural gas, researchers have made efforts to find ways to increase the production of coalbed methane. One such method is to replicate the natural production of methane formed by microbial breakdown of organic components present in coal (Flores et al., 2008; Strapoć et al., 2008; Midgley et al., 2010; Penner et al., 2010). This process of producing microbial methane from coal is referred to as Microbially Enhanced Coalbed Methane (MECBM) (Scott, 1999).

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Звіти організацій з теми "MICROBIALLY"

Quistorff, Anne S. Microbially Mediated Reductive Dechlorination of Dichlorobenzene. Fort Belvoir, VA: Defense Technical Information Center, August 1999. http://dx.doi.org/10.21236/ada384655.

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Bagwell, Christopher, Vanessa Garayburu-Caruso, and Danielle Saunders. Analysis of Microbial Communities as Indicators of Microbially Induced Corrosion Potential in Stainless Steel Piping. Office of Scientific and Technical Information (OSTI), September 2021. http://dx.doi.org/10.2172/1832167.

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Scott Fendorf. Microbially Mediated Immobilization of Contaminants Through In Situ Biostimulation. Office of Scientific and Technical Information (OSTI), July 2003. http://dx.doi.org/10.2172/822414.

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Sparks, Taylor D., John Mclennan, John Fuertez, and Kyu-Bum Han. Ceramic Proppant Design for In-situ Microbially Enhanced Methane Recovery. Office of Scientific and Technical Information (OSTI), December 2017. http://dx.doi.org/10.2172/1415142.

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Kenneth Brezinsky. Microbially-Enhanced Redox Solution Reoxidation for Sour Natural Gas Sweetening. Office of Scientific and Technical Information (OSTI), January 2008. http://dx.doi.org/10.2172/972637.

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Rai, C. Microbially-enhanced redox solution reoxidation for sweetening sour natural gas. Office of Scientific and Technical Information (OSTI), June 1995. http://dx.doi.org/10.2172/82537.

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Sevanto, Sanna. Microbial Carbon Cycling in Terrestrial Ecosystems Phase V: Mechanisms that create and maintain microbially-driven variation in carbon fate. Office of Scientific and Technical Information (OSTI), August 2021. http://dx.doi.org/10.2172/1812645.

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Gill Geesey, Timothy Magnuson, and Andrew Neal. Microbially-Promoted Solubilization of Steel Corrosion Products and Fate of Associated Actinides. Office of Scientific and Technical Information (OSTI), June 2002. http://dx.doi.org/10.2172/806821.

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Yyri A. Gorby, Gill G. Geesey, Jr Frank Caccavo, and James K. Fredrickson. Microbially Promoted Solubilization of Steel Corrosion Products and Fate of Associated Actinides. Office of Scientific and Technical Information (OSTI), February 2003. http://dx.doi.org/10.2172/809797.

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Gorby, Yuri A., Gill G. Geesey, and Frank Caccavo, Jr. Microbially Promoted Solubilization of Steel Corrosion Products and Fate of Associated Actinides. Office of Scientific and Technical Information (OSTI), June 1999. http://dx.doi.org/10.2172/831210.

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