Paul A. Duncan

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Glutamate dehydrogenase (GDH) (L-glutamate:NADP+ oxidoreductase, deaminating, EC from the cellulolytic ruminal bacterium Ruminococcus flavefaciens has been purified and characterized. The native enzyme and subunit are 280 and 48 kDa, respectively, suggesting that the native enzyme is a hexamer. The enzyme requires 0.5 M KCl for optimal activity and(More)
At Merck and Co. we have developed a recombinant E1 deficient adenovirus type 5 vaccine vector for HIV-1 and have adopted the PER.C6 cell line as a cell substrate for the manufacture of this vector for Phase I and II clinical trials. The PER.C6 cell line was developed at Crucell by the transfection of human primary embryonic retinoblasts with a transgene of(More)
The gene encoding glutamate dehydrogenase (gdhA) in the ruminal bacterium Ruminococcus flavefaciens FD-1 was cloned. A degenerate primer based on the N-terminal amino acid sequence of the purified protein was used in conjunction with genome walking to obtain the complete ORF of 1,365 bp, capable of encoding a polypeptide of 455 amino acid residues. The(More)
Demonstration of the viability of cryopreserved cell bank used to make a biopharmaceutical product is an important indicator of the ability to consistently manufacture over a long period of time, and is mandated in regulatory guidances. A mnn9 strain of Saccharomyces cerevisiae, chosen for its inability to hypermannosylate vaccine antigens, has a clumpy(More)
Hay from subirrigated meadows is the primary source of forage for wintering beef cattle in the Nebraska Sandhills. Hay quality is an important consideration if the nutritional needs oflivestock are to be met. Since the overall quality of the hay is a product of the individual components, quantifying the quality parameters of each species can be helpful in(More)
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