Stability of pyridoxal-5-phosphate semicarbazone: applications in plasma vitamin B6 analysis and population surveys of vitamin B6 nutritional status von URBINK, J. B, SERFONTEIN, W. J, DE VILLIERS, L. S

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Plasma pyridoxal-5-phosphate level as risk index for coronary artery disease von Serfontein, W.J., Ubbink, J.B., De Villiers, L.S., Rapley, C.H., Becker, P.J.

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Depressed plasma pyridoxal-5′-phosphate levels in tobacco-smoking men von Serfontein, W.J., Ubbink, J.B., De Villiers, L.S., Becker, P.J.

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Analytical recovery of protein-bound pyridoxal-5′-phosphate in plasma analysis von Ubbink, J.B., Serfontein, W.J., de Villiers, L.S.

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The relationship between vitamin B6 metabolism, asthma, and theophylline therapy von Ubbink, J.B. (University of Pretoria, Pretoria, South Africa), Vermaak, W.J.H, Delport, R, Serfontein, W.J, Bartel, P

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Determination of urinary 4-pyridoxic acid levels as 4-pyridoxic acid lactone using high-performance liquid chromatography von Ubbink, JB, Serfontein, WJ, Becker, PJ, De Villiers, LS

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Effect of different levels of oral pyridoxine supplementation on plasma pyridoxal-5′-phosphate and pyridoxal levels and urinary vitamin B-6 excretion von Ubbink, J B, Serfontein, W J, Becker, P J, de Villiers, L S

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Further evidence on the effect of vitamin E on the cholesterol distribution in lipoproteins with special reference to HDL subfractions von Serfontein, W J, Ubbink, J B, de Villiers, L S

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Prevalence of familial hypercholesterolemia von de Villiers, L S, Serfontein, W J

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Nitrosamines as environmental carcinogens. II. Evidence for the presence of nitrosamines in tobacco smoke condensate von Serfontein, W J, Hurter, P

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Plasma pyridoxal-5'-phosphate levels in myocardial infarction von Ubbink, J B, Serfontein, W J, de Villiers, L S

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A Method for identifying Small Amounts of Nitrosamines in Biological Material von SERFONTEIN, W. J., HURTER, P.

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Potential Inhibitors of Cancerous Growth. V. Substituted Benzylidene Derivatives of D-Ribose as Synthetic Intermediates von Serfontein, W. J, Lourens, G. J, De Waal, H. L

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A physicochemical study of an antifungal antibiotic from Bacillus subtilis von Van Vuuren, P.J., Joubert, F.J., Serfontein, W.J.

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The direct quantification in whole serum of HDL subfractions von Ubbink, Johan B., Serfontein, Willem J., de Villiers, Louis S.

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Unreliability of enzymatic cholesterol analyses for the determination of electrophoretically separated lipoproteins: selective loss of HDL cholesterol von Serfontein, Willem J., Ubbink, Johan B., de Villiers, Louis S.

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Potential Inhibitors of Cancerous Growth. III. Dibenzyl Acetals as Synthetic Intermediates von Jordaan, J. H, Serfontein, W. J

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Quantitative gas chromatographic analysis of barbiturates and hydantoins with quaternary ammonium hydroxides von Serfontein, Willem J., De Villiers, Louis S.

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Potential Inhibitors of Cancerous Growth. I. Synthesis of Cyclic Nitrogen Mustard Phosphamide Ester Derivatives of D-Ribose von Serfontein, W. J, Jordaan, J. H

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A rapid and comprehensive system for the routine identification of drugs in biological material based on microphase extraction and drug colour profiles von Serfontein, Willem J., Botha, Deo, De Villiers, Louis S.

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