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...
  11. Identification and genetic characterization of phenol-degrading bacteria from leaf microbial communities.

    Microbial Ecology 57(2):276 (2009) PMID 19034559

    Microbial communities on aerial plant leaves may contribute to the degradation of organic air pollutants such as phenol. Epiphytic bacteria capable of phenol degradation were isolated from the leaves of green ash trees grown at a site rich in airborne pollutants. Bacteria from these communities ...
  12. Bacterial succession within an ephemeral hypereutrophic Mojave Desert playa Lake.

    Microbial Ecology 57(2):307 (2009) PMID 18758846

    Ephemerally wet playas are conspicuous features of arid landscapes worldwide; however, they have not been well studied as habitats for microorganisms. We tracked the geochemistry and microbial community in Silver Lake playa, California, over one flooding/desiccation cycle following the unusually...
  13. Lipopeptides produced by a soil Bacillus megaterium strain.

    Microbial Ecology 57(2):367 (2009) PMID 18958512

    A soil microorganism identified as Bacillum megaterium was found to produce several antibiotics substances after growth for 20 h at 37 degrees C in a mineral culture medium. Analysis both by electron spray ionization (ESI) and matrix-assisted laser desorption ionization-time of flight (MALDI-TOF...
  14. Potential effect of freshwater virus on the structure and activity of bacterial communities in the Marennes-Oléron Bay (France).

    Microbial Ecology 57(2):295 (2009) PMID 18690405

    Batch culture experiments using viral enrichment were conducted to test the response of a coastal bacterial community to autochthonous (i.e., co-existing) or allochthonous riverine viruses. The effects of viral infections on bacterial dynamics and activity were assessed by epifluorescence micros...
  15. Evaluation of alternatives to methyl bromide in melon crops in Guatemala.

    Microbial Ecology 57(2):379 (2009) PMID 18998189

    The monoculture of melon in Guatemala has caused the massive appearance of plants with an analogous syndrome for the well-known disease commonly called melon collapse, or vine decline, causing significant losses in crops. Methyl bromide is commonly used to sterilize soil prior to planting in Gua...
  16. Molecular diversity of the rumen microbiome of Norwegian reindeer on natural summer pasture.

    Microbial Ecology 57(2):335 (2009) PMID 18604648

    The molecular diversity of the rumen microbiome was investigated in five semi-domesticated adult female Norwegian reindeer (Rangifer tarandus tarandus) grazing on natural summer pastures on the coast of northern Norway (71.00 degrees N, 25.30 degrees E). Mean population densities (numbers per gr...
  17. Importance of viral lysis and dissolved DNA for bacterioplankton activity in a P-limited estuary, Northern Baltic Sea.

    Microbial Ecology 57(2):286 (2009) PMID 18670729

    Through lysis of bacterioplankton cells, viruses mediate an important, but poorly understood, pathway of carbon and nutrients from the particulate to the dissolved form. Via this activity, nutrient-rich cell lysates may become available to noninfected cells and support significant growth. Howeve...
  18. Epizoic communities of prokaryotes on healthy and diseased scleractinian corals in Lingayen Gulf, Philippines.

    Microbial Ecology 57(1):117 (2009) PMID 18535850

    In search for microbiological indicators of coral health and coral diseases, community profiles of coral-associated epizoic prokaryotes were investigated because of their dual potential as a source of coral pathogens and their antagonists. In pairwise samples of visually healthy and diseased cor...
  19. Vertical distribution of a soil microbial community as affected by plant ecophysiological adaptation in a desert system.

    Microbial Ecology 57(1):36 (2009) PMID 18521656

    The spatial and temporal patterns of resource distribution in a desert system have been shown to influence a number of soil biota components and processes. The pattern of possible different resources supplied by two typical halophyte shrubs with different ecophysiological adaptations, Atriplex h...
  20. Shifts in microbial community composition following surface application of dredged river sediments.

    Microbial Ecology 57(1):160 (2009) PMID 18553170

    Sediment input to the Illinois River has drastically decreased river depth and reduced habitats for aquatic organisms. Dredging is being used to remove sediment from the Illinois River, and the dredged sediment is being applied to the surface of a brownfield site in Chicago with the goal of reve...