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  • bacteria  (7)
  • Springer  (7)
  • American Geophysical Union (AGU)
  • National Academy of Sciences
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  • Springer  (7)
  • American Geophysical Union (AGU)
  • National Academy of Sciences
  • Wiley-Blackwell  (1)
Years
  • 1
    Electronic Resource
    Electronic Resource
    Larval abundance of Chironomus circumdatus in relation to biotic and abiotic factors (1992)
    Springer
    Hydrobiologia 246 (1992), S. 205-212 
    Details
    ISSN: 1573-5117
    Keywords: Larval abundance ; Chironomus circumdatus ; tropical pond ; sewage canal ; bacteria ; organic matter ; oxygen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Larval abundance of Chironomus circumdatus in sewage canal and pond systems was studied during 1988–1990. Monthly changes in the morphometric features of the pond revealed that both total and littoral areas progressively decreased from 1063 and 107 m2 in December 1988 to 151 and 43 m2 in May '89; the decrease during the year 1989–1990 was from 1116 and 92 m2 in October to 109 and 31 m2 in May. A significant negative correlation (r= − 0.52) was obtained for the relation between littoral area and larval density in the pond. Larval density and biomass depended generally on the nature of the substrate and quantity of organic matter. Larval density of Ch. circumdatus was positively correlated with O2, bacterial count and organic matter content, but negatively correlated with CO2 level. Daily removal of organic matter by the larvae ranged from 20 to 31 % of the available organic matter in the sewage canal and from 3 to 11 % in the pond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005698
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  • 2
    Electronic Resource
    Electronic Resource
    Silver resistance in Pseudomonas stutzeri (1994)
    Springer
    BioMetals 7 (1994), S. 30-40 
    Details
    ISSN: 1572-8773
    Keywords: bacteria ; hydrogen sulfide ; Pseudomonas stutzeri ; resistance ; silver accumulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Silver resistance was studied in a silver-resistant Pseudomonas stutzeri AG259 strain and compared to a silver-sensitive P. stutzeri JM303 strain. Silver resistance was not due to silver complexation to intracellular polyphosphate or the presence of low molecular weight metal-binding protein(s). Both the silver-resistant and silver-sensitive P. stutzeri strains produced H2S, with the silver-resistant AG259 strain producing lower amounts of H2S than the silver-sensitive JM303 strain. However, intracellular acid-labile sulfide levels were generally higher in the silver-resistant P. stutzeri AG259 strain. Silver resistance may be due to formation of silver-sulfide complexes in the silver-resistant P. stutzeri AG259 strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00205191
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  • 3
    Electronic Resource
    Electronic Resource
    Environmental applications of immobilized microbial cells: A review (1996)
    Springer
    Journal of industrial microbiology and biotechnology 16 (1996), S. 79-101 
    Details
    ISSN: 1476-5535
    Keywords: alginate ; bacteria ; biodegradation ; bioremediation ; κ-carrageenan ; encapsulation ; immobilization ; microorganisms ; soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Immobilized microbial cells have been used extensively in various industrial and scientific endeavours. However, immobilized cells have not been used widely for environmental applications. This review examines many of the scientific and technical aspects involved in using immobilized microbial cells in environmental applications, with a particular focus on cells encapsulated in biopolymer gels. Some advantages and limitations of using immobilized cells in bioreactor studies are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570068
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular evolution in bacteria (1995)
    Springer
    Antonie van Leeuwenhoek 67 (1995), S. 315-324 
    Details
    ISSN: 1572-9699
    Keywords: bacteria ; ecology ; evolution ; metabolism ; microbiology ; molecular biology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Recent advances in microbiology and molecular biology have a unifying influence on our understanding of genetic diversity/similarity and evolutionary relationships in microorganisms. This article attempts to unify information from diverse areas such as microbiology, molecular biology, microbial physiology, clay crystal genes, metals-microbe-clay interactions and bacterial DNA restriction-modification systems (R-M) as they may apply to molecular evolution of bacteria. The possibility is discussed that the first informational molecules may have been catalytic RNA (micro-assembler) not DNA (now the master copy) and these first micro-assemblers may have been precursors of ribosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00872929
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  • 5
    Electronic Resource
    Electronic Resource
    Genome size in bacteria (1996)
    Springer
    Antonie van Leeuwenhoek 69 (1996), S. 293-303 
    Details
    ISSN: 1572-9699
    Keywords: electrophoresis ; bacteria ; evolution ; genome ; microbiology ; restriction-modification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This manuscript examines genome size in bacteria. The opposing capability of bacteria to alter their genome sizes and order of genes within limits yet remain somewhat constant provides a mechanism for diversity and evolution in bacterial populations. Bacteria may have evolved by increasing their genome size and changing gene orders with the assistance of restriction endonucleases cleaving foreign DNA and providing a diverse pool of DNA sequences for recombination. These aspects and selected information on physically mapping bacterial genomes will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00399618
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  • 6
    Electronic Resource
    Electronic Resource
    Introduction and recovery of Clavibacter michiganensis subsp. michiganensis from agricultural soil (1990)
    Springer
    Plant and soil 126 (1990), S. 141-143 
    Details
    ISSN: 1573-5036
    Keywords: bacteria ; Clavibacter michiganensis ; introduction ; plant pathogen ; recovery ; soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Twelve phytopathogenic Clavibacter michiganensis subsp. michiganensis strains were introduced into non-sterile agricultural loam soil at an inoculum density of about log. 6.0 cfu g−1 dry weight soil. The soil samples were incubated at 22°C under a 12h light, 12h dark cycle and the population densities followed over a 30-day period by plating subsamples of serial dilutions of soil on Brain Heart Infusion agar amended with 0.5% (w/v) yeast extract and 30 μg mL−1 nalidixic acid. In 5 soil samples C. michiganensis cfu were not detected after 30 days incubation. Initially, C. michiganensis cfu accounted for about 90% of the cfu recovered but decreased to less than 10% after 30 days. These results suggested that some C. michiganensis strains survive in this particular soil, while other strains exhibit poor survival and/or may be difficult to detect when present in low numbers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041380
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  • 7
    Electronic Resource
    Electronic Resource
    Distribution of microbial assemblages in the Central Arctic Ocean Basin studied by PCR/DGGE: analysis of a large data set (1999)
    Springer
    Hydrobiologia 401 (1999), S. 55-68 
    Details
    ISSN: 1573-5117
    Keywords: Arctic Ocean ; biogeography ; bacteria ; DGGE ; phylogeny ; SCICEX ; Cavalla
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Analysis of the biogeographic distributions of bacteria has been limited by potential biases inherent in the isolations required for classical taxonomy and by the time required for phylogenetic analyses. We have attempted to circumvent both of these limitations by using denaturing gradient gel electrophoresis (DGGE) to resolve the products of polymerase chain reaction (PCR) amplifications of mixed template DNA isolated from microbial communities. DGGE separates DNA fragments based on their denaturation characteristics, which vary with the nucleotide sequence of the fragment. The banding patterns in the electropherograms were then subjected to similarity analysis using pattern matching and band comparison software. Replication experiments tested the robustness of band patterns within and between gels. Samples were collected from the Central Arctic Ocean basin during April of 1995 on the SCICEX 95 cruise of the USS Cavalla. One hundred samples collected from a depth of 59 m are the focus of this biogeographical analysis. The band identification algorithm of the software identified between 12 and 30 bands (operational taxonomic units, OTUs) per sample (mean: 21.5) with minimal editing. This number approximately doubled with more extensive editing. Four OTUs seemed to be common to most samples. The samples grouped into five major clusters with similarities greater than approximately 80%. Twenty nine samples in one of these clusters were in two branches with internal similarities greater than approximately 90%. These samples had relatively nondescript banding patterns (numerous bands with roughly equal intensity). Another cluster contained 15 samples with distinctive banding patterns dominated by one or two intense bands. These samples were collected in the same general area of the Arctic Ocean (Canada Basin) and may reflect a community response to local environmental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003773907789
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