The Polysaccharides Synthesized by Strepto- Coccus Salivarius and Strepto-
نویسندگان
چکیده
In a previous paper (1) it was reported that certain non-hemolytic streptococci from the human throat are capable of synthesizing large amounts of a carbohydrate from sucrose and raffinose. These organisms seem to be similar to those studied by Oerskov and Poulsen (2). When grown on the surface of agar containing 5 per cent sucrose or raffinose, large mucoid colonies are produced which are about the size and appearance of the colonies formed by most varieties of the genus Rhixobium. Upon detailed study these slime producers were found to be typical strains of Streptococcus salivarius. This ability to produce very large mucoid colonies is possessed by no other recognized species of streptococcus, with the exception of occasional strains of Streptococcus bovis. From a large collection of Streptococcus bovis cultures only one strain was able to produce large mucoid colonies which were similar in appearance to those formed by Streptococcus saliva&s; three other cultures synthesized a carbohydrate but the surface colonies on sucrose agar were tenacious and dry and were much smaller than the large, moist, soft, mucoid colonies produced by Streptococcus salivarius. Oerskov (3) reported on the chemical properties of a carbohydrate synthesized by a streptococcus which he isolated from the mesenteric glands of a mouse. His findings indicate that the carbohydrate was a dextran. The present paper is a report on the chemical nature of the carbohydrates produced by strains of Streptococcus salivarius and Streptococcus bovis.
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