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.

β-LIPOTROPIN: PRIMARY STRUCTURE OF THE HORMONE FROM THE OSTRICH PITUITARY GLAND

Abstract: The amino acid sequence of beta-lipotropin from the ostrich pituitary has been determined. It consists of 79 amino acids. The amino acid sequence has been determined as follows: H-(1)AlA-Leu-Pro-Pro-Ala-Ala-Met-Leu-Pro-(10)Ala-Ala-Ala-Glu-Glu-Glu-Glu-Gly-Gl u-Glu-(20)Glu-Glu-Glu-Gly-Glu-Ala-Glu-Lys-Glu-Asp-(30)Gly-Gly-Ser-Tyr-Arg-Met-A rg-His-Phe-Arg-(40)Trp-Gln-Ala-Pro-Leu-Lys-Asp-Lys-Arg-Tyr-(50)Gly-Gly-Phe-Met- Ser-Ser-Glu-Arg-Gly-Arg-(60)Ala-Pro-Leu-Val-Thr-Leu-Phe-Lys-Asn-Ala-(70)Ile-Val -Lys-Ser-Ala-Tyr-Lys-Lys-Gly-(79)Gln-OH. When compared with the primary structures of other known beta-lipotropins, the sequence at the NH2-terminal, beta-melanotropin and beta-endorphin portions of the molecule exhibit considerable variability.

A nucleation theory for the anomalous freezing point depression of solvents in swollen rubber gels

Abstract: It is shown that, on cooling, solvent present at the surface of swollen vulcanizates freezes before the onset of freezing in the gel solvent, causing gel solvent to diffuse to the sample surface where it adds to existing crystalline areas. At the freezing point of the gel solvent a liquid-solid equilibrium does not exist, and a theory is postulated to account for the freezing point depression observed in swollen gels in terms of the conditions required for the formation of crystalline nuclei within the gel solvent. The theory is shown to apply to the freezing of cyclohexane and benzene in vulcanized and unvulcanized natural rubber. In line with the theory the presence of carbon black does not alter the solvent freezing point, but vacuole formation around nonreinforcing fillers leads to lower freezing point depressions.

Observations of Agulhas Current frontal features south of Africa, October 1983

Abstract: Over a period of 22 days in October 1983, oceanographic measurements were made along a line of eight ship's stations across the Agulhas Current south of Africa; 14 days of data from a mooring on the adjacent shelf are also available. Due to bad weather, some instrumentation problems and consistent cloud cover, the measurements are limited, but nonetheless they constitute the first set of such data in this dynamic regime. The currents were extremely variable, with frontal features causing on-offshore movements of the Agulhas Current inshore boundary of more than 50 km. These intrusions influenced shelf currents, while the strong wind conditions also affected upper ocean flows. The results show that care should be taken in the interpretation of Agulhas Current flow from sea surface temperatures.