Abstract
IN an article on the hardening and darkening of the insect cuticle, Dennell1 pointed out that both tyrosine and tyrosinase are present in the hæmolymph of late blow-fly larvae (for example, of Sarcophaga falculata), but that darkening does not occur unless the blood is exposed or the larvæ treated with various substances. He went on to suggest that this inhibition in situ may involve the action of an unidentified dehydrogenase, the destruction of which results in the onset of tyrosinase activity.
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References
Dennell, Nature, 154, 57 (1944).
Hopf, Biochem. J., 34, 1396 (1940).
Belehradek, "Temperature and Living Matter", Protoplasma Monographien, 8 (Berlin, 1935).
Fraenkel and Hopf, Biochem. J., 34, 1085 (1940).
MacBride and Hewer, in Piney's "Recent Advances in Microscopy" (London, 1931).
Bourne, in "Cytology and Cell Physiology" (Oxford, 1942).
MacCardle, J. Morph., 61, 613 (1937).
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JEFFERSON, G. Heat Injury in Insects. Nature 156, 111–112 (1945). https://doi.org/10.1038/156111a0
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DOI: https://doi.org/10.1038/156111a0
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