Effect of temperature on tensile fracture mechanisms of a Ni-base superalloy

Abstract

It has been previously shown that the eel corpuscles of Stannius (CS) synthesize and secrete a substance (PCS) which is functionally and immunologically related to the mammalian parathyrin family. Purification of PCS, including anion-exchange chromatography, ODS C-18 reverse-phase HPLC, and affinity chromatography, showed that a biologically active peak, eluted in 32% acetonitrile, contains a 32- to 34-kDa protein which is 600-fold more potent than the crude extract is a test involving the hypocalcemic response in the CS-deprived eel. Specific immunoprecipitation of protein encoded by mRNA extracted from eel CS indicates that a 45-kDa precursor is involved in PCS synthesis. The hypothetical significance of a "large" parathyrin-like molecule in fish is suggested in relation to what is known about mammalian parathyrin gene expression.