Now showing items 1-10 of 147
An investigation of new heterogeneous hydrotalcite-like catalysts for the cis-dihydroxylation of olefins.
The use of supported catalysts to essentially combine the positive traits offered by both homogeneous and heterogeneous catalysis has become a competitive field of research. In particular, hydrotalcite-like catalysts (HTIc) ...
Characterisation of SAPPI SAICCOR pulp mill's effluent.
SAPPI SAJCCOR, whose factory is situated south of Durban, South Africa, is one of the few paper and pulp mills that uses the acid sulphite process with calcium and magnesium bases to produce a high-grade cellulose pulp. ...
A phytochemical investigation of two South African plants with the screening of extractives for biological activity.
Two South African medicinal plants, Strophanthus speciosus and Eucomis montana, were investigated phytochemically. From Strophanthus speciosus a cardenolide, neritaloside, was isolated, whilst Eucomis montana yielded ...
Linear and nonlinear fluctuations in electron-positron plasmas.
The behaviour of both small amplitude and arbitrary amplitude nonlinear electrostatic fluctuations are studied in electron-positron plasmas. The propagation characteristics of associated linear modes are also examined ...
The association between VLF and ELF chorus emissions and electron precipitation.
This is an investigation into the association between ionospheric absorption caused by electron precipitation and ELF:3 Hz-3 kHz and VLF:3 kHz-30 kHz, chorus. Ionospheric absorption was measured using the chain of riometers ...
A study of photoinduced transformations of sunscreen chemical absorbers.
Solar ultraviolet radiation is known to have deleterious effects on human skin and is a major cause of skin cancer. Therefore, the topical application of sunscreen preparations has gained wide usage for skin protection. ...
Extractives from the ptaeroxylaceae and the mesembryanthemaceae.
This work is an account of the investigations into the chemistry of two Cedrelopsis species from the Ptaeroxylaceae, Cedrelopsis grevei and Cedrelopsis microfoliata and a species from the Mesembryanthemaceae, Khadia alticola, ...
The chemical investigation of Ledebouria zebrina and Scilla natalensis.
Ledebouria zebrina and Scilla natalensis Planch were the two species investigated in this work. Ledebouria zebrina belongs to the Hyacinthaceae (Liliacea sensu lato) and to this date, the chemical composition of this ...
Studies towards the synthesis of frog alkaloid 251F.
No abstract available
Pharos : pluri-director, high-resolution, analyser of radiometric properties of soil cores.
The core-logger has been designed for the high-resolution radiometric analysis of soil cores using multiple detectors. This device allows for the automation of the measuring process and eliminates the need to dissect the ...