Effect of culture filtrates on sporogenesis in a species of Clostridium.
نویسندگان
چکیده
In the course of concerted efforts to produce large crops of spores of the Clostridium species known as putrefactive anaerobe (PA) 3679, a sporogenic property of the culture filtrates of the organism was observed. Sporulation induced by culture filtrates was considered to be of sufficient fundamental importance to justify further investigation. This is a preliminary report of a study of the sporogenic property of spent media, presenting evidence of the occurrence of the phenomenon. The literature on the physiological aspects of sporulation has been comprehensively reviewed by Knaysi (1948), Murrell (1955), Foster (1956), and Stedman (1956). It is evident that much effort has been directed to the study of sporulation in the genus Bacillus, but reports of investigations on sporulation in the genus Clostridium are notably sparse. The work of Leifson (1931), Kaplan and Williams (1941), and Wynne (1948) are the most comprehensive contributions in this area. It seems generally agreed that bacteria form spores when the growth of a sporulating species in an adequate medium has made the medium unfavorable for further growth. Some early students of sporulation pointed to the accumulation of metabolic products as the initiator of sporulation, but a larger group has held that the exhaustion of nutrients induces sporulation (Knaysi, 1948). On the basis of published evidence, one cannot conclude that either of these is the specific condition inducing sporulation. There have been several reports of enhanced sporulation in the presence of culture filtrates of bacteria. Mellon (1926) noted the improved sporulation of a bacillus in the presence of a symbiont with which it was isolated. Culture
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عنوان ژورنال:
- Journal of bacteriology
دوره 74 5 شماره
صفحات -
تاریخ انتشار 1957