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The ability to control extracellular ice formation during freezing is critical to the survival of freezing-tolerant plants. Antifreeze proteins, which are proteins that have the ability to retard ice crystal growth, were recently identified as the most abundant apoplastic proteins in cold-acclimated winter rye (Secale cereale L.) leaves. In the experiments(More)
The carotid body is an arterial chemoreceptor organ responsive to blood levels of pO2, pCOe and pH 13. The parenchymal tissue of the carotid body is composed mainly of two cell types: the glomus or Type I cells, which are disposed together in groups or glomeruli, and the sustentacular or Type II cells, which appear as glial-like elements enclosing the(More)
The carotid bodies, along with the superior cervical ganglia and the adrenal glands, were removed from rabbits and cats and the activity of tyrosine hydroxylase (TH), the rate-limiting enzyme in catecholamine biosynthesis, was assayed by the method of Nagatsu (Anal. Biochem. 9: 122-126, 1964). The activities of the enzyme, in nmols tyrosine hydroxylated x(More)
Utilizing histone phosphorylation as the basis for a quantitative assay, the insulin-stimulated protein kinase in human placenta has been characterized. The kinase copurifies through wheat germ agglutinin-Sepharose and DEAE-cellulose in constant ratio to the insulin binding function. Both activities are bound to the same extent on insulin-Sepharose, and the(More)
Analogs of [arginine8]vasopressin (AVP) in which the peptide chain was elongated from the N-terminus by the addition of Ala-Arg-Arg-, Ala-Ala-Phe-, Pro-Arg-Val-, Pro-Ala-Arg-Arg, and Pro-Ala-Ala-Phe-, and from the C-terminus by the addition of -Ala-Met-Ala-NH2 and -Gly-Arg-Arg-Ala-NH2 were synthesized by the solid phase method and purified by Sephadex G-15(More)