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William J.H. Vermaak

Observed names: Vermaak Wjh, W J H Vermaak, W J Hayward Vermaak, W J Vermaak, W. J. H. VERMAAK, W. J. H. Vermaak, W. J. HAYWARD VERMAAK, W. J. Hayward Vermaak, W.H. Hayward Vermaak, W.J Hayward Vermaak, W.J. Hayward Vermaak, W.J.H Vermaak, W.J.H. Vermaak, W.J.Hayward Vermaak, WJ Hayward Vermaak, WJ Vermaak, WJH Vermaak, Willem J.H Vermaak, William J H Vermaak, William James Hayward Vermaak, William Jh Vermaak, William Vermaak, Wj Hayward Vermaak
Observed institutions: University of British Columbia, University of the Witwatersrand, University of the Free State, North-West University, South African Institute for Medical Research, University of Pretoria
OpenAlex ID: A5108588366
Rapid high-performance liquid chromatographic assay for total homocysteine levels in human serum
1991 · Johan B. Ubbink, W.J. Hayward Vermaak, et al. · Journal of Chromatography B Biomedical Sciences and Applications · 678
Vitamin B-12, vitamin B-6, and folate nutritional status in men with hyperhomocysteinemia
1993 · JB Ubbink, WJ Vermaak, et al. · American Journal of Clinical Nutrition · 461
Vitamin Requirements for the Treatment of Hyperhomocysteinemia in Humans
1994 · Johan B Ubbink, WJ Hayward Vermaak, et al. · Journal of Nutrition · 357
The effect of a subnormal vitamin B-6 status on homocysteine metabolism.
1996 · J B Ubbink, A van der Merwe, et al. · Journal of Clinical Investigation · 246
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Serum Adenosine Deaminase: Isoenzymes and Diagnostic Application
1992 · J P Ungerer, H M Oosthuizen, et al. · Clinical Chemistry · 205
The effect of blood sample aging and food consumption on plasma total homocysteine levels
1992 · Johan B. Ubbink, W.J.Hayward Vermaak, et al. · Clinica Chimica Acta · 131
Measurement of the ratio between the reduced and oxidized forms of coenzyme Q10 in human plasma as a possible marker of oxidative stress.
1996 · J Lagendijk, J B Ubbink, et al. · Journal of Lipid Research · 125
The prevalence of homocysteinemia and hypercholesterolemia in angiographically defined coronary heart disease
1991 · J. B. Ubbink, W. J. H. Vermaak, et al. · Journal of Molecular Medicine · 118
Homocysteine and ischaemic heart disease in the Caerphilly cohort
1998 · Johan B Ubbink, Ann M Fehily, et al. · Atherosclerosis · 114
Results of B-vitamin supplementation study used in a prediction model to define a reference range for plasma homocysteine
1995 · J B Ubbink, P J Becker, et al. · Clinical Chemistry · 110
Supplemented gamma-linolenic acid and eicosapentaenoic acid influence bone status in young male rats: Effects on free urinary collagen crosslinks, total urinary hydroxyproline, and bone calcium content
1995 · N. Claassen, H.C. Potgieter, et al. · Bone · 92
Effective homocysteine metabolism may protect South African blacks against coronary heart disease
1995 · JB Ubbink, WJ Vermaak, et al. · American Journal of Clinical Nutrition · 89
Hyperhomocysteinemia and the response to vitamin supplementation
1993 · J.B. Ubbink, A. Merwe, et al. · Journal of Molecular Medicine · 86
Vitamin B-6 nutrition status and cigarette smoking
1990 · WJ Vermaak, JB Ubbink, et al. · American Journal of Clinical Nutrition · 78
Folate status, homocysteine metabolism, and methylene tetrahydrofolate reductase genotype in rural south african blacks with a history of pregnancy complicated by neural tube defects
1999 · Johan B. Ubbink, Arnold Christianson, et al. · Metabolism · 65
The effect of Simvastatin on the plasma antioxidant concentrations in patients with hypercholesterolaemia
1997 · Johanna A. Human, Johan B. Ubbink, et al. · Clinica Chimica Acta · 59
Cholate and pH Reduce Interference by Sodium Dodecyl Sulfate in the Determination of DNA with Hoechst
1994 · M.J. Bester, H.C. Potgieter, et al. · Analytical Biochemistry · 57
Comparison of Three Different Plasma Homocysteine Assays with Gas Chromatography–Mass Spectrometry
1999 · Johan B Ubbink, Rhena Delport, et al. · Clinical Chemistry · 47
A New Perspective in the Assessment of Vitamin B-6 Nutritional Status during Pregnancy in Humans
1987 · Hendrik C. Barnard, Jan J. de Kock, et al. · Journal of Nutrition · 46
Ethnic immunity to coronary heart disease?
1991 · W.J.H. Vermaak, J.B. Ubbink, et al. · Atherosclerosis · 43
Ubiquinol/ubiquinone ratio as marker of oxidative stress in coronary artery disease.
1997 · J Lagendijk, J B Ubbink, et al. · PubMed · 42
Plasma Homocysteine Concentrations in a Population with a Low Coronary Heart Disease Prevalence
1996 · Johan B. Ubbink, Rhena Delport, et al. · Journal of Nutrition · 40
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The Determination of Allantoin, a Possible Indicator of Oxidant Status, in Human Plasma
1995 · J. Lagendijk, J. B. Ubbink, et al. · Journal of Chromatographic Science · 37
Spontaneous Oxidation of Methionine: Effect on the Quantification of Plasma Methionine Levels
1997 · Hendrik C Potgieter, Johan B Ubbink, et al. · Analytical Biochemistry · 36
Extruded dry beans and serum lipoprotein and plasma haemostatic factors in hyperlipidaemic men
2000 · W Oosthuizen, CS Scholtz, et al. · European Journal of Clinical Nutrition · 34
Works count: 104
Citation count: 4,146
H-index: 28
I10-index: 57
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