Original Research

• Two-dimensional generator function for the vector cardiogram for use in volume conduction models of the thorax

  T. A. Geldenhuys, M. Joubert, S. Viljoen, T. Hanekom

  127-137

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• The compounds and biological activity of Thamnosma africana

  H. F. Mafokane, N. Potgieter, T. Van Ree

  138-148

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• The concept of bioavailability and establishing uniform standards for permissible chemical contamination of soil

  A. J. Reinecke, S. A. Reinecke

  149--149

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• The implications of reading en writing language preference with regard to internet access for users in South Africa

  Pieter Blignaut, Theo Mcdonald

  165-171

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• The use of effect size indices to determine practical significance

  H. S. Styn jr., S. M. Ellis

  172-176

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• An investigation regarding metacognition in the learning of mathematics in the senior phase

  M. G. van der Walt, J. G. Maree, S. M. Ellis

  177-194

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