Johan B Ubbink

Summary

Affiliation: University of Pretoria
Country: South Africa

Publications

  1. ncbi The effect of a subnormal vitamin B-6 status on homocysteine metabolism
    J B Ubbink
    Department of Chemistry Pathology, University of Pretoria, South Africa
    J Clin Invest 98:177-84. 1996
  2. ncbi Homocysteine and ischaemic heart disease in the Caerphilly cohort
    J B Ubbink
    University of Pretoria, Department of Chemical Pathology, Faculty of Medicine, South Africa
    Atherosclerosis 140:349-56. 1998
  3. ncbi Should all elderly people receive folate supplements?
    J B Ubbink
    Department of Chemical Pathology, University of Pretoria, South Africa
    Drugs Aging 13:415-20. 1998
  4. ncbi Comparison of three different plasma homocysteine assays with gas chromatography-mass spectrometry
    J B Ubbink
    Department of Chemical Pathology, University of Pretoria, P O Box 2034, Pretoria 0001, South Africa
    Clin Chem 45:670-5. 1999
  5. ncbi Assay methods for the measurement of total homocyst(e)ine in plasma
    J B Ubbink
    Department of Chemical Pathology, University of Pretoria, South Africa
    Semin Thromb Hemost 26:233-41. 2000
  6. ncbi Variability of post-methionine load plasma homocysteine assays
    Johan B Ubbink
    Department of Chemical Pathology, University of Pretoria, P O Box 2034, South Africa
    Clin Chim Acta 330:111-9. 2003
  7. ncbi Hyperhomocyst(e)inemia is an important risk factor for vascular disease in subjects with high-molecular weight apo(a) isoforms
    Rhena Delport
    Department of Chemical Pathology, Institute of Pathology, University of Pretoria, Pretoria, South Africa
    Cardiovasc J S Afr 15:207-13. 2004
  8. ncbi Biological variation in sweat sodium chloride conductivity
    Da elene van der Merwe
    Department of Chemical Pathology, Faculty of Medicine, University of Pretoria, South Africa
    Ann Clin Biochem 39:39-43. 2002
  9. ncbi Physiologic mechanisms to maintain methionine status during protein malnutrition
    Johan B Ubbink
    Nutrition 18:96-7. 2002

Detail Information

Publications9

  1. ncbi The effect of a subnormal vitamin B-6 status on homocysteine metabolism
    J B Ubbink
    Department of Chemistry Pathology, University of Pretoria, South Africa
    J Clin Invest 98:177-84. 1996
    ..01) reduced in both groups after vitamin supplementation. It is concluded that a vitamin B-6 deficiency may contribute to impaired transsulfuration and an abnormal methionine load test, which is associated with premature vascular disease...
  2. ncbi Homocysteine and ischaemic heart disease in the Caerphilly cohort
    J B Ubbink
    University of Pretoria, Department of Chemical Pathology, Faculty of Medicine, South Africa
    Atherosclerosis 140:349-56. 1998
    ..05)...
  3. ncbi Should all elderly people receive folate supplements?
    J B Ubbink
    Department of Chemical Pathology, University of Pretoria, South Africa
    Drugs Aging 13:415-20. 1998
    ..The daily folate supplement should be at least 0.5 mg/day and it should never be used as a surrogate for a diet rich in fruit and vegetables...
  4. ncbi Comparison of three different plasma homocysteine assays with gas chromatography-mass spectrometry
    J B Ubbink
    Department of Chemical Pathology, University of Pretoria, P O Box 2034, Pretoria 0001, South Africa
    Clin Chem 45:670-5. 1999
    ..Various methods are available to measure plasma total homocyst(e)ine (tHcy) concentrations, but whether plasma tHcy assays may be used interchangeably is not known...
  5. ncbi Assay methods for the measurement of total homocyst(e)ine in plasma
    J B Ubbink
    Department of Chemical Pathology, University of Pretoria, South Africa
    Semin Thromb Hemost 26:233-41. 2000
    ..Between-method and between-laboratory variations in serum tHcy analysis are not yet satisfactory; certified reference material and standardization of the plasma tHcy assay will be essential to reduce between-laboratory bias...
  6. ncbi Variability of post-methionine load plasma homocysteine assays
    Johan B Ubbink
    Department of Chemical Pathology, University of Pretoria, P O Box 2034, South Africa
    Clin Chim Acta 330:111-9. 2003
    ..Lack of standardization impedes inter-laboratory comparisons. Criteria based on biological variation are suggested to standardize the methionine load test...
  7. ncbi Hyperhomocyst(e)inemia is an important risk factor for vascular disease in subjects with high-molecular weight apo(a) isoforms
    Rhena Delport
    Department of Chemical Pathology, Institute of Pathology, University of Pretoria, Pretoria, South Africa
    Cardiovasc J S Afr 15:207-13. 2004
    ..92; 95% CI: 0.51-7.24. CONCLUSIONS: We conclude that hyperhomocyst(e)inemia is an important risk factor in individuals with high-molecular weight apo(a) isoforms...
  8. ncbi Biological variation in sweat sodium chloride conductivity
    Da elene van der Merwe
    Department of Chemical Pathology, Faculty of Medicine, University of Pretoria, South Africa
    Ann Clin Biochem 39:39-43. 2002
    ..The aim of this study was to determine the components of biological variation for sweat sodium chloride conductivity and to apply biological variation parameters in the interpretation of sweat conductivity...
  9. ncbi Physiologic mechanisms to maintain methionine status during protein malnutrition
    Johan B Ubbink
    Nutrition 18:96-7. 2002