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PubMed1975

Polynucleotide sequence relationships among Ent plasmids and the relationship between Ent and other plasmids.

Deoxyribonucleic acid-deoxyribonucleic acid hybridization studies reveal that the plasmids coding for the production of heat stable and heat labile enteroxtoxins of Escherichia coli, regardless of their origin, have a majority of their polynucleotide sequences in common, but are not related in any significant way to those plasmids coding for the synthesis of only ST toxin. The heat stable and heat labile plasmids also share a significant degree of their polynucleotide sequences with plasmids of the FI and FII incompatibility groups, but not with R factors belonging to the I, N, W, P, or X incompatibility groups.

Animals↗
PubMed1986

Structural-functional relationships along the distal nephron.

The distal tubule, which includes the thick ascending limb (TAL), the macula densa, and the distal convoluted tubule (DCT), and the collecting duct are structurally heterogeneous, thus reflecting the functional heterogeneity that is also present. As the TAL ascends from medulla to cortex, the surface area of the apical plasma membrane increases while that of the basolateral membrane decreases. The structure of the DCT resembles that of the medullary TAL. An excellent correlation exists between structure, Na-K-ATPase activity, and NaCl reabsorptive capacity in the distal tubule. The collecting duct is subdivided into the initial collecting tubule (ICT), and cortical (CCD), outer medullary (OMCD), and inner medullary (IMCD) collecting ducts. Between the distal tubule and the collecting duct is a transition region termed the connecting segment or connecting tubule (CNT). Considerable structural heterogeneity exists along the collecting duct within the two major cell populations, the intercalated cells and the principal cells. In the CNT, the ICT, and the CCD, potassium loading and mineralocorticoids stimulate Na-K-ATPase activity and cause proliferation of the basolateral membrane of CNT cells and principal cells, thus identifying the cells responsible for mineralocorticoid-stimulated potassium secretion in these regions. Finally, at least two morphologically distinct populations of intercalated cells exist, types A and B. In the rat, type A predominates in the CNT and the OMCD and is believed to be responsible for H+ secretion, at least in the OMCD. Type B predominates in the CCD, where it may be involved in bicarbonate secretion.

Animals↗
PubMed1990

The relationship between culture, personality, and sexual jealousy in men in heterosexual and homosexual relationships.

This study proposes a new approach to sexual jealousy, that of attitude theory. Within that framework, it examines the roles of culture and personality in the development of sexual jealousy. Using 194 men representing 62 male homosexual couples and 81 heterosexual couples, three hypotheses were analyzed: (1) that jealousy measured by a standard attitude measure, the semantic differential technique, will significantly positively correlate with scores on a standard jealousy measure, Eugene Mathes' Interpersonal Jealousy Scale; (2) that men in heterosexual couples will have higher levels of sexual jealousy than men in homosexual couples; and (3) that sexual jealousy is inversely correlated with self-actualization personality. All three hypotheses were supported, suggesting that sexual jealousy, viewed as an attitude, is mediated by culture and personality.

Adult↗