The microsymbiont population in soybean root nodules (Glycine max L. cv Williams 82 inoculated with Bradyrhizobium japonicum 2143) was characterized during symbiotic development to determine the extent of heterogeneity in this population. The microsymbiont population was isolated by centrifugation through a continuous sucrose gradient (44 to 57% weight to weight ratio) and appeared homogeneous ...

Based on direct sucrose conversion, the bacterium Burkholderia sacchari is an excellent producer of the microbial homopolyester poly(3-hydroxybutyrate) (PHB). Restrictions of the strain's wild type in metabolizing structurally related 3-hydroxyvalerate (3HV) precursors towards 3HV-containing polyhydroxyalkanoate (PHA) copolyester calls for alternatives. We demonstrate the highly productive bios...

Legionella pneumophila, the causative agent of Legionnaires' disease, is an intracellular parasite of eukaryotic cells. In the environment, it colonizes amoebae. After being inhaled into the human lung, the bacteria infect and damage alveolar cells in a way that is mechanistically similar to the amoeba infection. Several L. pneumophila traits, among those the Dot/Icm type IVB protein secretion ...

Abstract This study describes the preparation, physicochemical characterization and biological studies of polymeric delivery systems proanthocyanidins (PCAN) extracted from Pelargonium sidoides for potential use as wound dressings. In this 20 wt% PCAN demonstrated good antimicrobial activity against Staphylococcus aures, a gram-positive pathogen. Poly(D,L-lactide) atactic poly[(R,S)-3-hydroxybu...

Recent studies have highlighted the therapeutic and ergogenic potential of ketone body ester, (R)-3-hydroxybutyl-(R)-3-hydroxybutyrate. In present work, enzymatic synthesis this biological active compound is reported. The (R)-3-hydroxybutyl-(R)-3-hydroxybutyrate has been produced through transesterification racemic ethyl 3-hydroxybutyrate with (R)-1,3-butanediol by exploiting selectivity Candid...

The morphology and miscibility of commercial poly(lactide) (PLA)/poly(b-hydroxybutyrate) (PHB, from 5 to 20 wt %) blends prepared by melt extrusion method, were investigated using differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR) observations. The results show that for all the studied blend contents, PLA/PHB blends are immiscible. The effects of PHB and ...