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Viability of Soil Bacteria: Optimization of Plate-Counting Technique and Comparison between Total Counts and Plate Counts within Different Size Groups
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Viability of Soil Bacteria: Optimization of Plate-Counting Technique and Comparison between Total Counts and Plate Counts within Different Size Groups
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Journal Article
Viability of Soil Bacteria: Optimization of Plate-Counting Technique and Comparison between Total Counts and Plate Counts within Different Size Groups
1987
Overview
Viable counts of heterotropic soil bacteria were 3-5 times higher on low-nutrient agar media compared with a series of conventional agar media. Substantial amounts of monosaccharides and amino acids were present in solid media made from distilled water and agar powder, and a salt-solution agar medium (without organic substrates added) gave practically the same colony counts as the low nutrient soil extract agar medium. MPN values were comparable to or lower than plate counts. A search for slow-growing cells in the negative MPN tubes by fluorescence microscopical examination after 3 months incubation was negative. The viable counts were 2-4% of the total microscopical counts in different soils. Assuming that the colony-forming cells did not derive from the numerous \"dwarf\" cells present in soil, a calculated percent viability of the larger cells was about 10%. The ecological significance of the plate-counting technique is discussed.
Publisher
Springer-Verlag New York Inc,Springer
Subject
/ Agronomy. Soil science and plant productions
/ Animal, plant and microbial ecology
/ Bacteria
/ Biological and medical sciences
/ Chemical, physicochemical, biochemical and biological properties
/ Fundamental and applied biological sciences. Psychology
/ Physics, chemistry, biochemistry and biology of agricultural and forest soils
/ Soil
