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S ISHIDA

Publications and source records attributed to S ISHIDA.

11 recordsLinked to original sources
PubMed1964

ISOLATION OF TOXIGENIC STRAINS OF CLOSTRIDIUM PERFRINGENS FROM SOIL.

Yamagishi, Takayoshi (Kanazawa University, Kanazawa, Japan), Shoichi Ishida, and Shoki Nishida. Isolation of toxigenic strains of Clostridium perfringens from soil. J. Bacteriol. 88:646-652. 1964-Strains of Clostridium perfringens were isolated from soil specimens heated at various temperatures for different lengths of time and were toxigenically examined. When higher temperatures were used, fewer toxigenic strains were isolated. Toxigenic strains could not be obtained from soil specimens heated at 100 C for 60 min. All toxigenic strains were killed by heating at 100 C for 10 min; strains that were resistant to these conditions were found to be nontoxigenic. These findings suggest that sporulating ability is closely linked to toxigenicity.

Antitoxins↗
PubMed1962

A new method for the turbidimetric measurement of bacterial density.

Kurokawa, Masami (National Institute of Health, Tokyo, Japan), Motoichi Hatano, Noboru Kashiwagi, Tateo Saito, Setsuji Ishida, and Reiko Homma. A new method for the turbidimetric measurement of bacterial density. J. Bacteriol. 83:14-19. 1962.-It was demonstrated that by a combination of two types of metameter of transmittance (T), -log T (0.0 </= T </= 0.5) and 0.6 + log (1 - T) (0.5 </= T </= 1.0), the optical density thus expressed showed a linear relationship to bacterial density or cell concentration over the whole range of T, except at the extreme ends. This allows measurement of relative bacterial density and cell concentration, and eliminates unnecessary sampling and dilution. In this respect, the proposed method seems superior to the method based upon Beer's law. The possible error derived from the fact that organisms may vary in size and shape at different stages of their growth is a fault common to all known methods of turbidimetric measurement, and is not peculiar to the method presented here.

Bacteriological Techniques↗