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S FRIEDMAN

Publications and source records attributed to S FRIEDMAN.

At least 19 recordsLinked to original sources
PubMed1965

"GENETIC SPECIES" CONCEPT IN XANTHOMONAS.

Friedman, S. (State University, Ghent, Belgium), and J. De Ley. "Genetic species" concept in Xanthomonas. J. Bacteriol. 89:95-100. 1965.-Deuterated, N(15)-labeled deoxyribonucleic acid (DNA) from Xanthomonas pelargonii forms distinct hybrids with ordinary DNA from X. hederae, X. juglandis, and X. carotae. Hybridization is less pronounced with X. phaseoli and X. begoniae. There is evidence that some hybridization occurs with X. vesicatoria, X. campestris, and X. tamarindi. These results favor the concept of a "genetic species," rather than a division of the genus into many separate species based almost entirely on phytopathogenic host specificity.

Centrifugation↗
PubMed1965

SIMILARITY OF XANTHOMONAS AND PSEUDOMONAS DEOXYRIBONUCLEIC ACID.

De Ley, J. (State University, Ghent, Belgium), and S. Friedman. Similarity of Xanthomonas and Pseudomonas deoxyribonucleic acid. J. Bacteriol. 89:1306-1309. 1965.-Pronounced deoxyribonucleic acid (DNA) hybridization was detected with the DNA-agar method within the group of Xanthomonas and between Xanthomonas and Pseudomonas. Sheared, denatured C(14)-DNA from X. pelargonii hybridized 80 to 100% with high molecular weight, denatured agar-bound DNA from eight different Xanthomonas nomenspecies. The near identity of the DNA in these nine strains favors their inclusion in one genetic species, for which the name Xanthomonas campestris is proposed. In addition, 60 to 80% of the Xanthomonas DNA hybridized with DNA from several Pseudomonas strains. These results are evidence of the close genetic relationship between the two genera.

Carbon Isotopes↗
PubMed1964

DEOXYRIBONUCLEIC ACID HYBRIDS OF ACETIC ACID BACTERIA.

De Ley, J. (State University, Ghent, Belgium), and S. Friedman. Deoxyribonucleic acid hybrids of acetic acid bacteria. J. Bacteriol. 88:937-945. 1964.-Deuterated N(15)-labeled deoxyribonucleic acid (DNA) from Acetobacter aceti (mesoxydans 4) forms hybrids with ordinary DNA from other species of this genus (A. xylinum, A. pasteurianus, A. estunensis, and possibly A. xylinoides) when the guanine plus cytosine base composition does not vary by more than 1 to 2%. Beyond this limit (A. aceti Ch31 and A. muciparus 5) no hybrids are formed. The hybrids are apparently derived from an asymmetrical part of the compositional distribution. The results lend strength to the concept of a genetic species rather than to a division of a genus into sharply separated species, based on small phenotypic differences. Taxonomic implications are discussed.

Acetic Acid↗