Online ISSN : 1881-6371
Print ISSN : 0914-5818
ISSN-L : 0914-5818
Volume 4 , Issue 1
Showing 1-15 articles out of 15 articles from the selected issue
Original Article
  • Yoko Takahashi, Yoshiko Seki, Yoshitake Tanaka, Ruiko Oiwa, Yuzuru Iwa ...
    1990 Volume 4 Issue 1 Pages 1-6
    Published: June 25, 1990
    Released: March 01, 2008
    Vertical distribution of microorganisms in soils was studied. The largest populations of bacteria (108/g of dried soil), actinomycetes (107/g) and fungi (105/g) were observed in soils from the top layer (0∼30cm in depth) of black color loam. Reduced numbers of bacteria and actinomycetes, but few fungi, were detected in soils of the second upper layer (50cm∼5m) of black loam. Bacteria (106/g) were also found even in silty sand soils of 40m depth. Vertical distribution of actinomycetes was examined in detail in soils of 0∼100cm depth taken at a 10cm interval. The actinomycete population was the largest in soils of the surface layer (0∼10cm), and decreased gradually as the depth increased. A comparative survey of all the isolates showed that ca. 80% of different kinds of actinomycete cultures were isolated from surface soils. It was demonstrated that actinomycetes peculiar to individual soil layers existed.
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Prodeedings of The Symposium on Actinomycetes: Yesterday, Today and Tomorrow -Biology of Streptomyces griseus '90- January 19, 1990 at the Science Council of Japan