- UPSpace Home
- →
- South African National Veterinary Repository
- →
- Browsing South African National Veterinary Repository by Author
JavaScript is disabled for your browser. Some features of this site may not work without it.
Browsing South African National Veterinary Repository by Author "De Waal, H.L."
Now showing items 1-8 of 8
-
De Waal, H.L.; Du Toit, P.J. (Pretoria : The Government Printer, 1939)(1) Preliminary chemical investigations upon Lotononis laxa E and Z, a dangerously toxic cyanogenetic plant to stock and occurring in the Lady Grey district, C.P., resulted in the isolation of a fatty ester, pinitol and ...
-
On the constitution of the bitter principle "Geigerin" I. The isolation of various degradation acids De Waal, H.L.; Du Toit, P.J. (Pretoria : Government Printer, 1938)In this study the author wish to record the first results already obtained on the constitution of Geigerin and to describe various degradation products obtained in oxidation or otherwise.These were very encouraging. Until ...
-
De Waal, H.L.; Du Toit, P.J. (Pretoria : Government Printer, 1939)Isatidine has been isolated not only from S. isatideus D.C. but also from S. retrorsus D.C., not hitherto observed by other workers. S. retrorsus contains as its main alkaloid retrorsine, accompanied by isatidine in lesser ...
-
De Waal, H.L.; DuToit, P.J. (Pretoria : The Government Printer, 1940)In the first paper of this series (de Waal, 1939) the isolation and chemical properties as well as the results of the preliminary hydrolysis and of the hydrogenation of the alkaloid isatidine were recorded. This alkaloid ...
-
De Waal, H.L.; Du Toit, P.J. (Pretoria : The Government Printer, 1940)I. Two of the main Senecio species responsible for "breadpoisoning" in human beings in the Cape South-Western districts, viz., S. ilicifolius Thunb. and S. rosmarinifolius Linn., have been chemically examined for their ...
-
De Waal, H.L.; Tiedt, J.; Du Toit, P.J. (Pretoria : The Government Printer, 1940)1. In this article are described the isolation of the alkaloid, platyphylline from Senecio adnatus D.C. as well as the preparation of some of its derivatives. 2. The alkaloid has the formula C₁₈H₂₅O₅N and its fission ...
-
De Waal, H.L.; Du Toit, P.J. (Pretoria : The Government Printer, 1941)1. Isatinecine has a pyrrole nucleus and has no tertiary nitrogen atom. It must, therefore have a secondary aminogroup. The pyrrollizidine structure applicable to the two senecio bases retronecine and platynecine is, ...
-
De Waal, H.L.; Pretorius, T.P.; Du Toit, P.J. (Pretoria : The Government Printer, 1941)(1) Senecio sceleratus sp. nov. 'Schweickerdt is an extremely toxic Senecio species. It contains at least three more or less toxic alkaloids, viz., isatidine, retrorsine and a new alkaloid, sceleratine, (2) Sceleratine, ...
Now showing items 1-8 of 8