John D. Newton
Wellington Management Company
5 Papers
49 Citations
John D. Newton is an academic researcher from Wellington Management Company. The author has contributed to research in topics: Vitellogenin & Vitellogenesis. The author has an hindex of 3, co-authored 5 publications.
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Papers
Slow Estradiol-induced Vitellogenesis in the Tuatara, Sphenodon punctatus
Alison Cree,Louis J. Guillette,Mark Brown,Geoffrey K. Chambers,John F. Cockrem,John D. Newton +5 more
TL;DR: Estradiol-induced vitellogenesis in tuatara is slower to induce and may occur at a lower maximal rate than in other reptiles examined, and responses are probably explained by the cool body temperatures exhibited by tu atara.
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Techniques for detecting vitellogenesis in the tuatara Sphenodon punctatus
TL;DR: Techniques for detecting plasma vitellogenin (the precursor to egg-yolk proteins) were investigated in a rare reptile, the tuatara (Sphenodon punctatus), and a unique protein, almost identical to that of partially purified vitelling from the turtle Chrysemys picta, appeared in the plasma 7 days after treatment.
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Variation in plasma constituents during the natural vitellogenic cycle of tuatara, Sphenodon Punctatus
TL;DR: The results provide further evidence that tuatara have an extraordinary prolonged and gradual vitellogenic cycle spanning several years for a single clutch of eggs, which is unique among reptiles.
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Proceedings of the society for research on amphibians and reptiles in New Zealand
Ruth Ainsworth,Mark Brown,Alison Cree,Geoff Chambers,J. M. Hay,Charles H. Daugherty,R. A. Hitchmough,Barbara Blanchard,John D. Newton,J. F. Cockrem,L. K. Cartland,N. M. Grimmond,G. B. Patterson,David R. Towns,S. L. Griffin,Malcolm L. Hunter,Patrick J. Miller,Donald G. Newman,R. M. G. Wells,A. (Tony) H. Whitaker +19 more
TL;DR: The role of MHC variation in disease resistance in Xenopus laevis tadpoles is studied and the results suggest that the latter are likely to be related to the former.
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