The observation that thiamin (B1) or pyridoxine (B.) serves as an alternate growth stimulant for one strain of brewers' top yeast and the conditions under which this equivalence occurs have been discussed elsewhere (Moses and Joslyn, 1953). The ability of the organism to synthesize thiamin or pyridoxine when grown in media deficient in either and its ability to form carboxylase under these cond...

The aim of this trial was to evaluate the effect of dietary nucleic acids on ureagenesis and nitrogen balance in gilthead sea bream juveniles. For that purpose, 5 isonitrogenous (7.25% N) diets were formulated based on fish meal as protein source (FM-control diet) and to partially replace the fish meal nitrogen with two levels of nucleic acids (diets RNA1 and RNA2) or brewers yeast (diets BY1 a...

It has been observed by Michaelis and Pechstein (1) and others, that a-methyl glucoside manifests a marked retarding influence on the hydrolysis of sucrose by invertase. The curves given in Fig. 1 represent the hydrolysis of a 10 per cent sucrose solution by invertase in the presence and absence of the glucoside. Nelson and Hitchcock (2) found that the hydrolysis of 10 per cent sucrose solution...

Field trials investigating the effect of food baits on catches of Musca domestica at toxic targets impregnated with the female sex pheromone, (Z)-9-tricosene, were conducted in a caged-layer deep-pit poultry unit in southern England. Targets treated with an Alfacron-sugar mixture and baited with 2.5 g of 40% (Z)-9-tricosene beads caught significantly greater numbers of both male and female M. d...

Cytochrome c probably belongs in the class of adaptive enzymes, in the sense that the cellular concentration of this chromoprotein appears to respond to the demand for its function in the utilization of oxygen (3). The substrate-induced synthesis of mammalian cytochrome c may be deduced from the findings of Drabkin (2, 4, 5) in experimental hypothyroid and hyperthyroid (thyrotoxic) rats, in whi...