University of Port Elizabeth

About: University of Port Elizabeth is a based out in . It is known for research contribution in the topics: Population & Estuary. The organization has 1067 authors who have published 1538 publications receiving 38560 citations. The organization is also known as: UPE & Universiteit van Port Elizabeth.

Plasma arginine vasotocin, angiotensin II, and salt gland function in freshwater‐ and seawater‐adapted kelp gulls (Larus dominicanus)

Abstract: Kelp gulls (mean body weight of 905.3 ± 46.5 g, plasma osmolality of 316.5 ± 1.5 mOsm.kg−1, plasma Na+ of 151.3 ± 0.8 mEq.liter−1, and plasma K+ of 3.1 ± 0.2 mEq.liter−1 (means ± SE) were adapted to fresh water and had basal plasma concentrations of arginine vasotocin (AVT) and angiotensin II (AII) of 13.6 ± 1.1 pg.ml−1 and 48.1 ± 3.4 pg.ml−1, respectively. Adaptation to seawater strengths of 25, 50, 75, and 100% produced significant elevations of plasma osmolality, electrolytes, and AVT concentrations that plateaued with 50% seawater. Body mass and plasma AII levels were not significantly altered. Comparison of salt gland function in birds adapted to fresh water with those adapted to 100% seawater showed some differences in concentrating and secretory capabilities.

Structure of the Table Mountain Group in the Port Elizabeth area

Abstract: Selected outcrops along the Baakens valley and coastal strip east of Sardinia Bay were used to determine the overall structure of the Table Mountain Group (TMG) close to Port Elizabeth. A large recumbent fold (nappe?) structure is interpreted to be the result of an early phase of shortening. Pelitic horizons were subsequently smeared out along thrusts in the TMG. This caused repeated stacking, resulting in an unusually thick sequence of quartzites. The last phase of tectonism was extensional. An 8 km broad graben formed between two prominent west-northwest-striking fault zones, the Moregrove and Chelsea-Noordhoek faults

A dsc study of curative interactions. iii, the interaction of tmtm with zno, sulfur, and stearic acid

Abstract: The interaction among various combinations of sulfur, tetramethylthiuram monosulphide (TMTM), ZnO, and stearic acid were studied by differential scanning calorimetry in the absence of rubber. Sulfur and TMTM reacted to form tetramethylthiuram disulphide, and the ternary eutectic mixture melted at about 80°C. The absence of the Sγ Sμ transition in sulfur/TMTM mixes was related to a sulfur/TMTM interaction, wherein the eightmembered sulfur rings were opened at temperatures well below 170°C. The interaction of stearic acid with TMTM led to the decomposition of TMTM, but the reaction was largely suppressed when both ZnO and sulfur were present in the mixture. No evidence was found for the formation of a zinc-accelerator complex of the type normally attributed a role in the accelerated sulfur vulcanization.