We describe useful vectors to select double-crossover events directly in site-directed marker exchange mutagenesis in gram-negative bacteria. These vectors contain the gusA marker gene, providing colorimetric screens to identify bacteria harboring those sequences. The applicability of these vectors was shown by mapping the 3* end of the Xanthomonas campestris gum operon, involved in biosynthesi...

It was with interest that I read this paper, which looks at the effect of feeding xanthan gum on colonic function in man. The authors look at whether it is possible to predict the laxative effect of a polysaccharide from its fermentation characteristics in vitro, as proposed by Adiotomre et al. (1990). However, the authors have not used the methodology used in the Adiotomre paper and, therefore...

Dispersive soils are exemplary that in the presence of water they exhibit highly erosive behaviour. Stabilization dispersive through Xanthan Gum (XG) biopolymer is a sustainable, efficient, and long-term alternative to traditional techniques. The present study aims evaluate strength durability performance treated subjected different adverse environments. An unconfined compressive (UCS) specimen...

Strains tentatively identified as Bacillus sp. were isolated from sewage sludge and soil and shown to elaborate extracellular enzymes that degrade the extracellular polysaccharide (xanthan gum, polysaccharide B-1459) of Xanthomonas campestris NRRL B-1459. Enzyme production by one strain was greatly enhanced when the strain was incubated in a mixed culture. Products of degradation were identifie...

Biopolymer soil treatment has been introduced as the latest technological innovation in stabilization and improvement. Biopolymers with agar, guar, xanthan, casein, gellan sodium alginate have commonly studied to improve strength, reduce hydraulic conductivity prevent erosion of highly permeable materials. Among those, xanthan gum is perform better terms lowering permeability. In this study, ef...

Xanthan gum is an extracellular hetero polysaccharides of many industrial applications and produced by Xanthomonas campestris. This biopolymer is produced as extracellular product in submerged fermentation system. The production of xanthan was influenced by the concentration in glucose in medium. The maximal volumetric production of 17.9 g L was obtained in 80 g L glucose culture in shake flask...

In the present investigation, an attempt has been made to increase therapeutic efficacy, reduce frequency of administration, and improve patient compliance, by developing sustained release matrix tablets of diclofenac sodium. Sustained release matrix tablets of diclofenac sodium, were developed by using different drug: polymer ratios, such as F1 (1:0.12), F2 (1:0.16), F3 (1:0.20), F4 (1:0.24) a...