Browsing by Supervisor "Ubbink, Johan B."

Now showing items 1-3 of 3

Kinetic studies of vitamin B6 metabolism in humans

Van der Westhuizen, Christian Abraham (University of Pretoria, 2001)

The primal aim of this thesis was to establish whether kinetic aspects of vitamin B6 metabolism predispose to earlier observed racial differences found in plasma pyridoxal-5'-phosphate (PLP). The active forms of vitamin ...
N-methylnicotinamide as marker for biological methylation in humans

Rosemann, G.M. (Gertruida Magdalena) (University of Pretoria, 2006-03-13)

The purpose of this study was to determine whether the methylation of nicotinamide to N-methylnicotinamide could discriminate between differences in methionine nutritional status, and by implication methylation capacity, ...
Quantitative analysis of catecholamines and their metabolites in human urine by gas chromatography - mass spectrometry as a screening method for sympatho-adrenal tumors

Marais, Brian (University of Pretoria, 2009-04-15)

The endogenous catecholamines and their metabolites play an integral role in establishing the presence or absence of a suspected sympatho-adrenal tumor. Highly elevated metabolites excreted in the urine are indicative of ...

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