The effect of nickel on the hydrogen metabolism of the cyanobacterium Anabaena cylindrica

Abstract The oxyhydrogen reaction of the cyanobacterium Anabaena cylindrica was shown to be dependent on the availability of nickel ions in the growth medium. The rate of nitrogenase-catalyzed hydrogen formation was shown to be inversely related to the capacity of the cells to consume hydrogen gas as seen by experiments in which the nickel ion concentration was systematically varied. Nickel-depleted cultures released hydrogen in air and dinitrogen.     

Eurytrema cladorchis Chin,Li & Wei, 1965 (Trematoda: Dicrocoeliidae), a little known species from China and Nepal

Summary Eurytrema cladorchis is redescribed from specimens from ox, goat and cow in Nepal, whence it is recorded for the first time. This species was first reported in China and its existence has passed almost unnoticed elsewhere.