Racemic 2-(5,7-dichloro-3-indolyl)propionic acid (5,7-Cl(2)-2-IPA) was synthesized from 5,7-dichloroindole-3-acetic acid by successive esterification, methoxycarbonylation, methylation, and double hydrolysis. The racemate was converted to diastereomeric esters of l-menthol; these were separated by recycling HPLC into two optically active diastereomers that were then hydrolyzed with p-TsOH to tw...

Within the last six years the identification of several new substances with thyroid hormone-like activity has led to a re-evaluation of the physiological role of thyroxine and of its analogs and derivatives. Since its isolation in 1915 (1) thyroxine was considered the most biologically potent of all simple thyroactive materials until the discovery by Gross and Pitt-Rivers (2) and by Roche, Liss...

background and objectives: acetic acid bacteria (aab) are useful in industrial production of vinegar. the present study aims at isolation and identification of acetic acid bacteria with characterization, optimization, and evaluation of their acetic acid productivity. materials and methods: samples from various fruits were screened for presence of acetic acid bacteria on glucose, yeast extract, ...

a, ar-Di(glycylamino)propionic acid hydrochloride, (NH&H2CONH)2C(CH,)COOH.HCl, is enzymatically hydrolyzed in aqueous extracts of rat kidney to yield, as a maximum, 1 mole of ammonia and 1 mole of pyruvic acid per mole of substrate (1). a-(dl-Chloropropionylamino)-a-(nI,-alanylamino)propionic acid and a:, ac-di(nL-alanylamino)propionic acid hydrochloride are also hydrolyzed by rat kidney, the f...

The ability of indole derivatives to facilitate RNA polymerase transcription of the L-arabinose operon in Escherichia coli was shown to require the catabolite activator protein (CAP) as well as the araC gene product. Adenosine 3',5'-monophosphate (cAMP) was not obligatory for araBAD transcription when the cells were grown in the presence of 1 mM indole-3-acetic acid or in the presence of indole...

A composite microbial system (XDC-2) was used to pretreat and hydrolyze corn stalk to enhance anaerobic digestion. The results of pretreatment indicated that sCOD concentrations of hydrolysate were highest (8,233 mg/l) at the fifth day. XDC-2 efficiently degraded the corn stalk by nearly 45%, decreasing the cellulose content by 22.7% and the hemicellulose content by 74.1%. Total levels of volat...

According to our best knowledge, this is the first report applying Artificial neural networks (ANN) for simulation of batch propionic acid (PA) fermentation. Therefore, main focus research was investigate applicability ANN on PA fermentations. To demonstrate this, we used results 40 Propionibacterium acidipropionici fermentations (ca 2,000 data points) build up ANN, and additional two independe...

This study was conducted to evaluate the inactivation of Bacillus cereus spore in mesquite flour with intense pulsed light (IPL) and gamma radiation. The physical, chemical, toxicity treated were also investigated. results showed that up 3.51 log10CFU/g B. achieved 8 kGy radiation, 1.69 reductions could be after 28s catalytic IPL exposure. Although chemometric analysis 9-hydroxy-10,12-octadecad...