xanthomonas campestris was used for producing xanthan gum using date syrup, prepared from low quality dates, as a substrate. fermentation was carried out with date syrup and sucrose syrup at 28 ˚c and ph 6.8 in a rotary benmarin shaker (240 rpm). the effect of fermentation period (24, 48, 72, 96 and 120 h) on xanthan gum production was studied. the results showed that eps concentration increase...

Transl Androl Urol 2014;3(3):241 www.amepc.org/tau The regulation of dietary and supplemental calcium intake in relation to urinary stone disease is not well understood (1). For instance, why do most patients with primary hyperparathyroidism with markedly increased serum and urinary calcium not have a history of urinary stone disease? There must be other factors involved in stone formation. Cal...

Glutamine synthetase (GS), as measured by its 7-glutamyl transferase (GT) activity ~, can be precociously induced in chick embryo retinas in tissue culture at least 7 days before its normal rapid elevation in o v o (Reif-Lehrer, 1968). The enzyme can be induced by a number of glucocorticoids (Chader and Reif-Lehrer, 1972), cortisol being the one most commonly employed. In such experiments , the...

The least-area hypersurface enclosing and separating two given volumes in R is the standard double bubble.

We prove that the standard double bubble provides the least-area way to enclose and separate two regions of prescribed volume in R3.

We prove that the standard double bubble provides the least-area way to enclose and separate two regions of prescribed volume in R3.

An improved plaque assay for dengue virus was developed utilizing baby hamster kidney (BHK-21) cells initially grown in shaker culture. Different media preparations were tested for uniform and fast formation of BHK-21 cell sheets. Several overlay formulas were tested to develop a rapid plaque assay in 6- and 24-well plastic plates. The best results were obtained utilizing Eagle minimal essentia...

We have examined the interaction between TEA and K+ ions in the pore of Shaker potassium channels. We found that the ability of external TEA to antagonize block of Shaker channels by internal TEA depended on internal K+ ions. In contrast, this antagonism was independent of external K+ concentrations between 0.2 and 40 mM. The external TEA antagonism of internal TEA block increased linearly with...