Three medicinal plants Abutilon mauritianum, Bacopa monnifera and Datura stramonium were assessed for phytochemical components and antimicrobial activity. The results revealed that all the three plant extracts contained saponins, tannins and alkaloids. Only Datura stramonium contained glycosides. The plants exert varying inhibitory effects on Pseudomonas aeruginosa, Klebsiella pneumonia and Esc...

High perform ance liquid chrom atography was used to quantify the sesquiterpene phenolic esters, G uayulin A and -B in Parthenium argentatum (guayule) and Fj hybrids o f guayule with Parthenium schottii, P. fruticosum var. trilobatum and P. tomentosum var. stramonium. The d istri­ bution o f these phenolic acid esters in all parts o f the plants are reported and their inheritance in hybrids is ...

Deletion of perR in Listeria monocytogenes results in a small-colony phenotype (DeltaperRsm) that is slow growing and exhibits increased sensitivity to H2O2. At a relatively high frequency, large-colony variants (DeltaperRlg) arise, which are more resistant to H2O2 than the wild-type and ultimately dominate the culture. Transcriptional analysis revealed that the kat gene (catalase) is up-regula...

A flavanone and a flavanone glycoside, together with vomifoliol, have been isolated for the first time from the aerial parts of the plant Echiochilon fruticosum and identified. Their structures were established on the basis of spectroscopic measurements, mainly 2D NMR using COSY, HMQC and HMBC experiments.

Iron is required by almost all bacteria, but concentrations above physiological levels are toxic. In bacteria, intracellular iron is regulated mostly by the ferric uptake regulator, Fur, or a similar functional protein. Iron limitation results in the regulation of a number of genes, especially those involved in iron uptake. A subset of these genes is the Fur regulon under the control of Fur. In...