@article {2186,
	title = {Application of Enzyme Production Properties in Subtyping of Group A Streptococci According to T Type},
	journal = {Applied Microbiology},
	volume = {22},
	number = {5},
	year = {1971},
	pages = {748-751},
	abstract = {The production of extracellular nicotinamide adenine dinucleotide glycohydrolase (NADG) and the cell-bound lipoproteinase (serum opacity reaction, SOR) by strains of different serological types of group A streptococci, in relation to the T typing, was studied. The production of both NADG and SOR, or only one of them, was found to be characteristic of serotypes, as determined by M and T antigen. No difference in the production of these enzymes was found in relation to M-positive and M-negative variants. Investigation into NADG and SOR production as related to the T type enabled the division of a single agglutination pattern into four main groups, each of which corresponds to one specific M type or more. Of the 370 strains belonging to 12 different T-agglutination patterns, 21\% produced both enzymes and 42.5\% failed to produce any of them, whereas the remaining 36.5\% produced only one out of the two enzymes. Five streptococcal types which did not produce NADG and SOR also failed to synthesize streptolysin S at the early logarithmic phase of growth, indicating that streptolysin S production by young cultures may be also related to serotype. No correlation was found between the production of NADG-SOR as related to serotype and the production of streptolysin O, acid phosphotase, esterase, N-acetylglucosaminidase, hyaluronidase, streptokinase, and the cell-sensitizing factor. The practical and potential usefulness of NADG and SOR production in epidemiological studies is discussed.},
	author = {I. Ofek and S. Fleiderman and S. Bergner-Rabinowitz and Isaac Ginsburg}
}
@article {1881,
	title = {The focus of infection theory: A new look at the possible relation to poststreptococcal sequelae},
	journal = {Human Pathology},
	volume = {2},
	number = {3},
	year = {1971},
	pages = {345-347},
	author = {Isaac Ginsburg}
}
@article {1760,
	title = {Localization of Group a Streptococci and Particles of Titanium Dioxide in Arthritic Lesions in the Rabbit},
	journal = {The Journal of Infectious Diseases},
	volume = {123},
	number = {3},
	year = {1971},
	pages = {292-296},
	author = {Isaac Ginsburg and Rama Trost}
}
@article {1787,
	title = {Phosphatase, Esterase, N-Acetylglucosaminidase, and Adenosine Triphosphatase of Group A Streptococci},
	journal = {Experimental Biology and Medicine},
	volume = {137},
	number = {2},
	year = {1971},
	pages = {645-652},
	abstract = {Washed suspensions of group A, C, and G streptococci and group A L-forms possess phosphatase, esterase, and N-acetylglucosaminidase, respectively. Cell-free extracts, obtained from streptococci and Informs by mechanical disintegration or by treatment of group A streptococci with phage-associated lysin, possess, in addition to these enzymes, an adenosine triphosphatase (ATPase). Over 90\% of the total ATPase and NAGAase and 50\% of phosphatase and esterase activities were solubilized by cell breakage, indicating that the latter 2 enzymes are membrane-bound. A partial separation between the phosphatase, NAGAase, and ATPase was achieved by gel filtration of cell-free extracts on Sephadex G-200. Phosphatase was eluted with high molecular weight material excluded from the column. NAGAase and ATPase were associated with much lower molecular weight fractions, while esterase activity was present in both high and low molecular weight fractions. Studies on substrate specificity showed that fractions which split PNP-phosphate also split PNP-acetate and PNP-propionate fractions which split ATPase also split CTP, ITP, and GTP but to a lesser extent. Fractions which were active against β-napthylacetate also split β-naphthyl butyrate (15\% efficiency); no activity against longer fatty acid esters of PNP or β-naphthyl derivatives was present.},
	author = {Isaac Ginsburg and M. Heller and H.A. Gallis}
}
