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  • 1
    Electronic Resource
    Electronic Resource
    Functional and anatomical relationships between antral gastrin cells and gastrin-releasing peptide neurons (1985)
    Springer
    Histochemistry and cell biology 82 (1985), S. 463-467 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The present studies were directed to examine the effect of gastrin-releasing peptide (GRP) on β-adrenergic stimulated gastrin release by cultured rat antral mucosa and to assess the anatomical relationship between gastrin cells and GRP nerves in rat and human antrum. Peptide-containing cells were identified by application of an avidinbiotin-peroxidase immunocytochemical double staining method utilizing antibodies to GRP and gastrin prepared in rabbits. Rat antral mucosa was cultured for 60 min and gastrin released into the culture medium was measured by radioimmunoassay. Inclusion of antibodies to GRP in culture medium did not affect carbachol-stimulated gastrin release, whereas isoproterenol-stimulated gastrin release into the medium was inhibited significantly by addition of GRP antiserum to the culture medium. GRP-containing neurons and axonal fibers were stained immunocytochemically with diaminobenzidine (reddish-brown specific staining) and were located in the lamina propria adjacent to and surrounding the main lobules of antral glands. After double staining utilizing 4-Cl-1-Naphthol as substrate, blue stained gastrin-containing cells were identified in the middle and deeper regions of antral glands in close proximity to GRP neuronal elements. These studies suggest that β-adrenergic, but not cholinergic, stimulation of gastrin release is mediated, at least in part, through GRP. They also demonstrate intimate anatomical, as well as functional, relationships between gastrin cells and GRP-containing neurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450481
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Enhanced N2-fixing ability of a deletion mutant of arctic rhizobia with sainfoin (Onobrychis viciifolia) (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 795-800 
    Details
    ISSN: 1432-2242
    Keywords: Arctic Rhizobium ; Symbiotic efficiency ; Nitrogenase ; Plasmid ; Deletion mutant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mutagenesis provoked by exposure at elevated temperature of the cold-adapted, arctic Rhizobium strain N31 resulted in the generation of five deletion mutants, which exhibited loss of their smaller plasmid (200 kb), whereas the larger plasmid (〉 500 kb) was still present in all mutants. Deletion mutants did not show differences from the wild type in the antibiotic resistance pattern, the carbohydrates and organic acids utilization, and the growth rate at low temperature. However, deletion mutants differed from the wild type and among themselves in the ex planta nitrogenase activity, the nodulation index, and the symbiotic effectiveness. The deletion mutant N31.6rif r showed higher nodulation index and exhibited higher nitrogenase activity and symbiotic efficiency than the other deletion mutants and the wild type. The process of deletion mutation resulted in the improvement of an arctic Rhizobium strain having an earlier and higher symbiotic nitrogen fixation efficiency than the wild type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224194
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dinitrogen fixation (C2H2 reduction) by bacterial strains at various temperatures (1987)
    Springer
    Plant and soil 103 (1987), S. 233-237 
    Details
    ISSN: 1573-5036
    Keywords: acetylene-reducing activity ; azospirillum ; azotobacter ; bacillus ; enterobacter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Acetylene-reducing activities (ARA) of strains ofEnterobacter agglomerans, Azospirillum brasilense, Azotobacter chroococcum, and Bacillus, isolated from temperate or tropical soils, were compared at different temperatures to study temperature adaptability. All Enterobacter strains and Bacillus strain C-11-25 reduced C2H2 at temperatures as low as 5°C. ARA by Enterobacter strains declined sharply above 30°C but ARA by Bacillus strain C-11-25 continued to increase with an increase in temperature.A. brasilense strain sp 245, isolated from wheat roots in Brazil, reduced more C2H2 at lower temperatures than strain Cd, isolated from a Californian soil. Similarly, the temperate strain ofA. chroococcum was a better N2 fixer than the tropicalA. chroococcum strain at lower temperatures. Tropical strains ofA. brasilense andA. chroococcum reduced more C2H2 than temperate strains at higher temperatures. Therefore, it appears that temperate and tropical N2-fixing organisms adapt themselves to their particular environment and should have more potential to benefit crops grown at the particular temperatures favorable to them. Only Bacillus strain C-11-25 has potential to benefit both temperate and tropical crops because it reduced significant acetylene over a wide temperature range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370394
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    Paper (German National Licenses)
    Fulltext
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