Quantitative validation of nicotine production in tea (Camellia sinensis L.).

Endogenous nicotine was confirmed to be present in tea plants (Camellia sinensis L.) by liquid chromatography-tandem mass spectrometry of tea samples from tea-producing regions in six Asian countries. All samples contained nicotine (0.

Pantoea theicola sp. nov., isolated from black tea.

A Gram-negative, facultatively anaerobic strain was isolated from black tea. On the basis of 16S rRNA gene sequence similarity comparisons, strain QC88-366T was grouped into the genus Pantoea, being related most closely to the type strains of Pantoea gaviniae (98.5 %) and Pantoea calida (98.

Purification and characterization of a soluble recombinant human ST6Gal I functionally expressed in Escherichia coli.

A soluble and active form of recombinant human ST6Gal I was expressed in Escherichia coli. The gene encoding the soluble form of ST6Gal I lacking the membrane and cytosolic regions was introduced into a bacterial expression vector, pMAL-p2X, fused in frame with a maltose-binding protein (MBP) tag. Low-temperature cultivation at 13 degrees C during IPTG-induction significantly improved both solubility and MBP-tagging of the recombinant enzyme expressed in bacteria.