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Microbial Ecology

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  1. Decomposition of Cr(V)-diols to Cr(III) complexes by Arthrobacter oxydans.

    Microbial Ecology 57(2):360 (2009) PMID 19067030

    We demonstrated previously that Cr(VI) is readily reduced to oxoCr(V)-diols at the surface of Arthrobacter oxydans-a Gram-positive aerobic bacteria isolated from Columbia basalt rocks originated from a highly contaminated site in the USA. Here, we report an electron spin resonance (ESR) study of...
  2. PCR-DGGE comparison of bacterial community structure in fresh and archived soils sampled along a Chihuahuan Desert elevational gradient.

    Microbial Ecology 57(2):261 (2009) PMID 19107315

    The polymerase chain reaction coupled with denaturing gradient gel electrophoresis (PCR-DGGE) has been used widely to determine species richness and structure of microbial communities in a variety of environments. Researchers commonly archive soil samples after routine chemical or microbial anal...
  3. Respiration in the light and bacterio-phytoplankton coupling in a coastal environment.

    Microbial Ecology 57(2):321 (2009) PMID 18661115

    In pelagic ecosystems, the principal source of organic matter is via autotrophic production and the primary sink is through heterotrophic respiration. One would therefore anticipate that there is some degree of linkage between these two compartments. Recent work has shown that respiration in the...
  4. The effect of copper on the structure of the ammonia-oxidizing microbial community in an activated sludge wastewater treatment plant.

    Microbial Ecology 57(2):215 (2009) PMID 18677527

    Molecular approaches based on both whole-cell and extracted DNA were applied to assess chronic and acute effects of copper on the ammonia oxidizing bacteria (AOB) community in an activated sludge system. The ammonia monooxygenase amoA gene was chosen as the functional marker to evaluate changes ...
  5. Bioremediation of dyes in textile effluents by Aspergillus oryzae.

    Microbial Ecology 57(2):384 (2009) PMID 18989608

    In this study Aspergillus oryzae was utilized to remove azo dyes from aqueous solution. Physically induced in its paramorphogenic form to produce standardized mycelial pellets, the non-autoclaved and autoclaved hyphae biomass was applied to biosorb the reactive dyes Procion Red HE7B (PR-HE7B) an...
  6. Bacterial communities associated with the digestive tract of the predatory ground beetle, Poecilus chalcites, and their modification by laboratory rearing and antibiotic treatment.

    Microbial Ecology 57(2):349 (2009) PMID 18587608

    Ground beetles such as Poecilus chalcites (Coleoptera: Carabidae) are beneficial insects in agricultural systems where they contribute to the control of insect and weed pests. We assessed the complexity of bacterial communities occurring in the digestive tracts of field-collected P. chalcites us...
  7. Soil microbial community response to drought and precipitation variability in the Chihuahuan Desert.

    Microbial Ecology 57(2):248 (2009) PMID 19067031

    Increases in the magnitude and variability of precipitation events have been predicted for the Chihuahuan Desert region of West Texas. As patterns of moisture inputs and amounts change, soil microbial communities will respond to these alterations in soil moisture windows. In this study, we exami...
  8. Bacterial diversity and structural changes of oyster shell during 1-year storage.

    Microbial Ecology 57(2):221 (2009) PMID 18762853

    We examined the biodiversity of bacteria associated with oyster-shell waste during a 1-year storage period using 16S ribosomal DNA analysis. Temperature variation and structural changes of oyster shell were observed during storage. Initial and final temperatures were at 16-17 degrees C, but a hi...
  9. Influence of host plant genotype, presence of a pathogen, and coinoculation with Pseudomonas fluorescens strains on the rhizosphere expression of hydrogen cyanide- and 2,4-diacetylphloroglucinol biosynthetic genes in P. fluorescens biocontrol strain CHA0.

    Microbial Ecology 57(2):267 (2009) PMID 19030916

    The production of hydrogen cyanide (HCN) and 2,4-diacetylphloroglucinol (DAPG) is a major factor in the control of soil-borne diseases by Pseudomonas fluorescens CHA0. We investigated the impact of different biotic factors on the expression of HCN-in comparison to DAPG biosynthetic genes in the ...
  10. Southern African biological soil crusts are ubiquitous and highly diverse in drylands, being restricted by rainfall frequency.

    Microbial Ecology 57(2):229 (2009) PMID 18850242

    Biological soil crusts (BSCs) are found in all dryland regions of the world, including the polar regions. They are also known to occur in the southern African region. Although there were a number of case studies on BSCs from that region, we did not know if they are a normal part of the vegetatio...