This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrowReprints and Permissions
Right arrow Copyright Information
Right arrow Books from ASM Press
Right arrow MicrobeWorld
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Dunican, L. K.
Right arrow Articles by Seeley, H. W.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Dunican, L. K.
Right arrow Articles by Seeley, H. W.

 Previous Article  |  Next Article 

J Bacteriol. 1962 February; 83(2): 264-269
Copyright © 1962, The Williams & Wilkins Company. All Rights Reserved.

STARCH HYDROLYSIS BY STREPTOCOCCUS EQUINUS

Lawrence K. Dunican1 and Harry W. Seeley

a Division of Bacteriology, Department of Dairy and Food Science, College of Agriculture, Cornell University, Ithaca, New York

ABSTRACT

DUNICAN, LAWRENCE K. (Cornell University, Ithaca, N. Y.) AND HARRY W. SEELEY. Starch hydrolysis by Streptococcus equinus. J. Bacteriol. 82:264–269. 1962.—In a study of starch hydrolysis by strains of Streptococcus equinus, 52 isolates were obtained and their amylolytic abilities determined. It was found that all the strains could hydrolyze starch to some extent when grown in the presence of an easily fermentable carbohydrate, viz., glucose. Without this carbohydrate the organisms did not hydrolyze starch. The hydrolysis of starch was inhibited when the organisms were grown in an atmosphere of 5% CO2 and 95% N2, even if grown in the presence of a fermentable monosaccharide. S. bovis, which was used as a reference organism, readily hydrolyzed starch in the absence of monosaccharides and in atmospheres containing CO2. In no instance did S. equinus hydrolyze the starch to the level of reducing sugars. Negligible amounts of reducing sugars were recovered when the cell-free filtrates of S. equinus were incubated with starch. With S. bovis, the yield of reducing sugars under such conditions was almost quantitative. These facts extend further the differences between these related organisms.

The ability to synthesize an internal starchlike polysaccharide was noted in most of the strains of S. equinus. Synthesis was found when the organisms were grown on maltose or on a starch medium containing a small amount of fermentable monosaccharide.

FOOTNOTES

1 Holder of an American Grant Counterpart Fund Scholarship, awarded by University College, Dublin, Ireland.

J Bacteriol. 1962 February; 83(2): 264-269
Copyright © 1962, The Williams & Wilkins Company. All Rights Reserved.





Copyright © 2009 by the American Society for Microbiology.   For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»