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PubMed1965

REINFORCEMENT SCHEDULE GENERATED BY AN ON-LINE DIGITAL COMPUTER.

A LINC digital computer was used to generate an autoregressive schedule of reinforcement. On such a schedule the probability of reinforcement is a function of the similarity in duration of the intervals between successive responses. A detailed analysis of the data obtained from monkeys on this schedule demonstrated two distinct tendencies in their behavior: a tendency for periodic response and a tendency for serial dependence between successive interresponse times.

Animals↗
PubMed1964

ADANSONIAN ANALYSIS AND DEOXYRIBONUCLEIC ACID BASE COMPOSITION OF SOME GRAM-NEGATIVE BACTERIA.

Colwell, R. R. (Georgetown University, Washington, D.C.), and M. Mandel. Adansonian analysis and deoxyribonucleic acid base composition of some gram-negative bacteria. J. Bacteriol. 87:1412-1422. 1964.-The deoxyribonucleic acid (DNA) base compositions and S values for a minimum of 134 coded properties were determined for representative cultures of the genera Pseudomonas, Xanthomonas, Aeromonas, Vibrio, Aerobacter, Escherichia, Alcaligenes, and Flavobacterium. Those cultures having a high degree of similarity by the criterion of numerical taxonomy were found to have similar DNA base compositions. The relative affinities of clusters of cultures suggest taxonomic relations. Eleven species of Xanthomonas might be a single species, and V. metschnikovii was shown to be more closely related to enteric bacteria than to other vibrios which, in turn, were found to be like pseudomonads. Aeromonas was found to be intermediate in similarity to enterics and pseudomonads and divisible into at least two, but possibly three, species. F. aquatile was unlike any of the other organisms studied, and its DNA also differed greatly in composition from other representatives of the genus.

Aeromonas↗