Biology, ecology, and biotechnological applications of anaerobic bacteria adapted to environmental stresses in temperature, pH, salinity, or substrates.

Lowe, S E; Jain, M K; Zeikus, J. G.

doi:10.1128/mmbr.57.2.451-509.1993

Cited by 129 publications

(51 citation statements)

References 247 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For bacteria to thrive inside these microhabitats, they must survive digestion and the acidic condition. The observed lowest pH (5.40) in our study is well within the tolerable range for most bacteria (Cotter and Hill 2003;Nojoumi et al 2008), including anaerobes (Lowe et al 1993), and diverse, viable bacterial communities have been recovered from copepod guts (Delille and Razouls 1994;Hansen and Bech 1996). On the other hand, the organic-rich environment inside a copepod gut may even support higher bacterial growth than the ambient ocean (Tang 2005).…”

Section: Discussionsupporting

confidence: 65%

Copepod guts as biogeochemical hotspots in the sea: Evidence from microelectrode profiling of Calanus spp

Tang¹,

Glud²,

Glud³

et al. 2011

Limnology & Oceanography

View full text Add to dashboard Cite

The environmental conditions inside the gut of Calanus hyperboreus and C. glacialis were measured with microelectrodes. An acidic potential hydrogen (pH) gradient was present in the gut of C. hyperboreus, and the lowest pH recorded was 5.40. The gut pH of a starved copepod decreased by 0.53 after the copepod resumed feeding for a few hours, indicating the secretion of acidic digestive fluid. A copepod feeding on Thalassiosira weissflogii (diatom) had slightly lower pH than that feeding on Rhodomonas salina (cryptophyte). Oxygen was undersaturated in the gut of both C. hyperboreus and C. glacialis, with a steep gradient from the anal opening to the metasome region. The central metasome region was completely anoxic. Food remains in the gut led to a lower oxygen level, and a diatom diet induced a stronger oxygen gradient than a cryptophyte diet. The acidic and suboxic-anoxic environments of the copepod gut may support iron dissolution and anaerobic microbial activities that otherwise are not favored in the well-buffered and oxygenated ambient ocean.

show abstract

Section: Discussionsupporting

confidence: 65%

Copepod guts as biogeochemical hotspots in the sea: Evidence from microelectrode profiling of Calanus spp

Tang¹,

Glud²,

Glud³

et al. 2011

Limnology & Oceanography

View full text Add to dashboard Cite

show abstract

“…Alternatively, abiotic factors can also affect the ecological fate and distribution of pollutant chemicals, making them more recalcitrant for microbial degradation under natural environmental conditions (Leahy & Colwell, 1990;Master & Mohn, 1998;Bending et al, 2003). As indicated earlier, among all the abiotic factors pH, temperature, substrate (pollutant) con-centration, moisture content, nutrient availability and the presence of metal ions have been studied in detail (Lowe et al, 1993;Semprini, 1995;Chenier et al, 2003). Such studies have indicated that diverse mechanisms of abiotic factors influence the efficiency of the in situ bioremediation process (Mukherji & Weber, 1998;Krasteva et al, 2001;Gourlay et al, 2005).…”

Section: Abiotic Factorsmentioning

confidence: 99%

Integrative approaches for assessing the ecological sustainability ofin situbioremediation

2009

View full text Add to dashboard Cite

Application of microbial metabolic potential (bioremediation) is accepted as an environmentally benign and economical measure for decontamination of polluted environments. Bioremediation methods are generally categorized into ex situ and in situ bioremediation. Although in situ bioremediation methods have been in use for two to three decades, they have not yet yielded the expected results. Their limited success has been attributed to reduced ecological sustainability under environmental conditions. An important determinant of sustainability of in situ bioremediation is pollutant bioavailability. Microbial chemotaxis is postulated to improve pollutant bioavailability significantly; consequently, application of chemotactic microorganisms can considerably enhance the performance of in situ degradation. The environmental fate of degradative microorganisms and the ecological consequence of intervention constitute other important descriptors for the efficiency and sustainability of bioremediation processes. Integrative use of culture-dependent, culture-independent methods (e.g. amplified rDNA restriction analysis, terminal restriction fragment length polymorphism, denaturing/thermal gradient gel electrophoresis, phospholipid fatty acid, etc.), computational and statistical analyses has enabled successful monitoring of the above aspects. The present review provides a detailed insight into some of the key factors that affect the efficiency of in situ bioremediation along with a comprehensive account of the integrative approaches used for assessing the ecological sustainability of processes. The review also discusses the possibility of developing suicidal genetically engineered microorganisms for optimized and controlled in situ bioremediation.

show abstract

“…The complete mineralization of complex organic matter to CO 2 and CH 4 occurs in anoxic environments where electron acceptors, other than CO 2 , are limiting. [1][2][3][4][5] Examples of such environments include freshwater sediments, flooded soils, wet wood of trees, tundra, landfills, and sewage digestors. Syntrophic metabolism plays an essential role in the recycling of organic matter to methane and carbon dioxide in these environments.…”

Section: Introductionmentioning

confidence: 99%

Physiology, Ecology, Phylogeny, and Genomics of Microorganisms Capable of Syntrophic Metabolism

McInerney

Struchtemeyer

Sieber

et al. 2008

Annals of the New York Academy of Sciences

357

306

View full text Add to dashboard Cite

Syntrophic metabolism is diverse in two respects: phylogenetically with microorganisms capable of syntrophic metabolism found in the Deltaproteobacteria and in the low G+C gram-positive bacteria, and metabolically given the wide variety of compounds that can be syntrophically metabolized. The latter includes saturated fatty acids, unsaturated fatty acids, alcohols, and hydrocarbons. Besides residing in freshwater and marine anoxic sediments and soils, microbes capable of syntrophic metabolism also have been observed in more extreme habitats, including acidic soils, alkaline soils, thermal springs, and permanently cold soils, demonstrating that syntrophy is a widely distributed metabolic process in nature. Recent ecological and physiological studies show that syntrophy plays a far larger role in carbon cycling than was previously thought. The availability of the first complete genome sequences for four model microorganisms capable of syntrophic metabolism provides the genetic framework to begin dissecting the biochemistry of the marginal energy economies and interspecies interactions that are characteristic of the syntrophic lifestyle.

show abstract

Biology, ecology, and biotechnological applications of anaerobic bacteria adapted to environmental stresses in temperature, pH, salinity, or substrates.

Abstract: PCE dechlorination by D. tiedjei.475 (ii) PCE dechlorination by Methanosarcina spp.475 (iii) CCl4 dechlorination ...475 (iv) Metabolism of tetrachloromethane.475

Cited by 129 publications

References 247 publications

Copepod guts as biogeochemical hotspots in the sea: Evidence from microelectrode profiling of Calanus spp

Copepod guts as biogeochemical hotspots in the sea: Evidence from microelectrode profiling of Calanus spp

Integrative approaches for assessing the ecological sustainability ofin situbioremediation

Physiology, Ecology, Phylogeny, and Genomics of Microorganisms Capable of Syntrophic Metabolism

Contact Info

Product

Resources

About