Many investigators have found that the vitamin B complex is of major importance for the growth of lactic acid bacteria. Although the nutritional requirements of lactobacilli and streptococci have been given prominence, considerable work has also been done on the other members of this group of organisms. For example, Leuconostoc mesenteroides was shown to require pantothenic acid by Snell, Stron...

The coenzyme function of pyridoxal-phosphate in cysteine desulfhydration and in the mechanistically similar serine and threonine dehydration (deamination) processes has been a subject of discussion in a number of recent publications (see, for example, Snell, 1952, and Braunstein and Shemyakin, 1953). A chemical model reaction has been proposed (Metzler and Snell, 1952). Evidence for pyridoxal-p...

Schlenk, F. and Snell, E. E. (1945). J . bh2. Chem. 157, 425. Scott, M. L., Nonis, L. C., Heuser, G. F. and Bruce, W. F. (1945). J . b i d . C h . 158, 291. Scott, M. L., Norris, L. C., Heuser, G. F., Bruce, W. F., Coover, H. W., Bellamy, W. D. and Gunsalus, I. C. (1944). J . b i d . Chem. 154, 713. Simmons, R. W. andNorris, E. R. (1941). Smith, F. R. (1943). J . B&. 46, 369. Snell, E. E. and R...

Fibroblasts from long-lived mutant mice are resistant to many forms of lethal injury as well as to the metabolic effects of rotenone and low-glucose medium. Here we evaluated fibroblasts from young adult naked mole-rats (NMR; Heterocephalus glaber), a rodent species in which maximal longevity exceeds 28 years. Compared to mouse cells, NMR cells were resistant to cadmium, methyl methanesulfonate...

The behaviour of a scalar optical beam at the boundary between two dissimilar nonlinear media is of fundamental interest in nonlinear photonics. Here, we report the first systematic generalization of our Kerr analyses to a wider class of power-law materials. Universal refraction laws will be given, and theorysimulation agreement demonstrated.

It is very common in medical studies for a patient to experience more than one event rather of interest. This led exposing an individual multiple risks and practitioners need account these concerning some prognostic factors. There are many methods dealing with events survival data classically, however, break down when considering the top-down effect factors concurrently correlated (competing ri...

Both fluorometric and microbiological measurements of urinary riboflavin excretion have served as a basis for evaluation of nutritional status, detection of deficiency states, measurement of physiological availability, and determination of daily requirements. Fluorometric assay methods have commonly followed three basic procedures; namely, (a) that of Najjar (l), based on the extraction of ribo...