Pressure Effects in Hafnium Pentatelluride and Zirconium Pentatelluride

We have measured the effect of pressure (0 to 17) kbar) on the resistivity and the thermopower of HfTe/sub 5/ and ZrTe/sub 5/ as a function of temperature. Pressure affects these two materials in different ways. The resistance shows a greater effect than the thermopower. There is a larger effect in HfTe/sub 5/ than in ZrTe/sub 5/. Possible explanations in terms of a Fermi surface instability and a semi-metal are given

Modification of pentobarbital effects by natural and synthetic polypeptides: Dissociation of brain and pituirary effects

Thyrotropin releasing hormone (TRH) antagonizes pentobarbital sedation and hypothermia; somatotropin release inhibiting factor amplifies them. Other hypothalamic polypeptide releasing factors, Substance P and a variety of amino acids are ineffective. Three congeners of TRH antagonize pentobarbital; one amplifies it. The potencies of congeners as pentobarbital antagonists are unrelated to their potencies as pituitary thyrotropin releasers