The production of ammonia and carbon dioxide by streptococci

Ayers, S. Henry; Rupp, Philip; Mudge, C. S.

doi:10.1093/infdis/29.3.235

Cited by 17 publications

(8 citation statements)

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“…The application of this reaction, for the specific purpose for which it was recommended by them, has proved to be one of the outstanding physiological tests which have been used in the differentiation of streptococci. The production of ammonia from 4 per cent peptone by streptococci was recommended by Ayers, Rupp and Mudge (1921) as a useful differential test, and this method was fruitfully applied by these investigators in their subsequent studies. As ammonia production from peptone has been used by only a few investigators in recent years, it cannot be said just how much general utility it has in the study of the streptococci.…”

Section: Methodsmentioning

confidence: 99%

The Streptococci

Sherman¹

1937

Bacteriological Reviews

222

133

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Section: Methodsmentioning

confidence: 99%

The Streptococci

Sherman¹

1937

Bacteriological Reviews

222

133

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“…The production of ammonia from peptone was introduced into the study of streptococci by Ayers, Rupp and Mudge (1921) and constitutes a valuable test which deserves wider usage. Except for the contributions of Ayers and his associates and a number of papers from this laboratory, little has been reported on the production of ammonia by streptococci.…”

Section: Streptococcus Salivariusmentioning

confidence: 99%

Streptococcus salivarius

1937

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During the past twenty years, with the application of improved methods and more extensive tests, a number of the natural groups or species of the streptococci have become fairly clearly defined. Among the more adequately described groups are those typified by Streptococcus pyogenes, the "animal pyogenes," Streptococcus equi, Streptococcus mastitidis, Streptococcus lactis, Streptococcus fecalis, Streptococcus liquefaciens, Streptococcus zymogenes, Streptococcus bovis and Streptococcus thermophilus. On the other hand, some of the streptococci which have been well known since the relatively early days of bacteriology have not been extensively studied by the more modern methods, and the differentiation of these forms from some of the better established groups is not entirely clear. In such a state are the characteristic non-hemolytic streptococci of the human throat, commonly designated as the "viridans group," Streptococcus mitior, Streptococcus salivarius, Streptococcus mitis, etc.The present study was limited to the predominating streptococci in the throats of healthy and presumably normal persons. The isolations were made by the application of quantitative dilution methods to freshly taken swab samples, so as to eliminate not only organisms of fortuitous occurrence, but also even streptococci native to the throat which may occur in small numbers.Under these quantitative restrictions true beta-hemolytic streptococci were not obtained among the 322 cultures which were isolated at various times from 20 healthy individuals. 263 on July 16, 2020 by guest

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“…The principles involved in the "formol titration" of bacterial cultures or media are the same as those embodied in the methods of Malfatti (1908) and of Henriques and S6rensen (1909) for the titration of urine. They have been applied to the study of bacterial cultures by a number of authors, notably Kendall, Day and Walker (1913), Itano (1916), Berman andRettger (1918), Foster andRandall (1921), Ayers, Rupp and Mudge (1921), and Kendall (1922). An excess of formalin (approximately 40 per cent formaldehyde) is added to the sample to be titrated.…”

mentioning

confidence: 99%

The Formol Titration of Bacteriological Media

Brown¹

1923

J Bacteriol

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The production of ammonia and carbon dioxide by streptococci

Cited by 17 publications

References 0 publications

The Streptococci

The Streptococci

Streptococcus salivarius

The Formol Titration of Bacteriological Media

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