David Heldt

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  • D Heldt, A D Lawrence, +4 authors M J Warren
  • Biochemical Society transactions
  • 2005
The aerobic biosynthetic pathway for vitamin B12 (cobalamin) biosynthesis is reviewed. Particular attention is focused on the ring contraction process, whereby an integral carbon atom of the tetrapyrrole-derived macrocycle is removed. Previous work had established that this chemically demanding step is facilitated by the action of a mono-oxygenase called(More)
Electrospun PLLA/SWNT Nanocomposite Fibril for Cartilage Regeneration Shairali Shiva Rao Frank K. Ko, Ph.D. In this study, Poly-L-Lactic acid has been used as the base polymer to fabricate an electrospun, 3-dimensional, fibrillar scaffold for cartilage regeneration. In the scaffolds, fiber diameters as low as 150nm were obtained with an average of 550nm.(More)
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