We present results of local spin density approximation (LSDA) pseudopotential calculations for the perovskite structure oxide, bismuth manganite (BiMnO3). The origin of the differences between bismuth manganite and other perovskite manganites is determined by first calculating total energies and band structures of the high symmetry cubic phase, then sequentially lowering the magnetic and struct...

Two groups of 12 human volunteers, who had been treated with colloidal bismuth subcitrate, because of Helicobacter pylori-associated gastritis, participated in the study. The patients received a single dose of meso-2,3-dimercaptosuccinic acid (DMSA) or D,L-2,3-dimercaptopropane-1-sulfonic acid (DMPS) at a dose of 30 mg kg-1 in a randomized single blind study. In contrast to DMPS, increasing con...

Bismuth subsalicylate was tested in an in vivo perfused rabbit model of oesophagitis for its ability to prevent the mucosal injury caused by pepsin. Treatment efficacy was assessed under both a treatment-before-injury protocol and a treatment-after-injury protocol. Oesophageal mucosal barrier function was evaluated by measuring flux rates of H+, K+, and glucose. The degree of oesophagitis was d...

The characterization of and construction of a new optical sensor based on the immobilization of Pyrocatechol Violet on a triacetylcellulose membrane was described to for the determination of bismuth (III) in real samples. The interaction between sensing membrane and bismuth (III) was caused at pH 3.80 in acetate buffer solution and the color changed from yellow to blue along with the appearance...

Ohmic contact electrodes for four-wire resistance and Hall measurements were fabricated on an individual single-crystal bismuth nanowire encapsulated in a cylindrical quartz template. Focused ion beam processing was utilized to expose the side surfaces of the bismuth nanowire in the template, and carbon and tungsten electrodes were deposited on the bismuth nanowire in situ to achieve electrical...

A two-dimensional radial-axial hybrid simulation of the xenon-fueled Stanford Hall Thruster has been adapted to model a bismuth-fed thruster with varying channel geometry. The simulation treats the electrons as a quasi-one-dimensional fluid and the neutrals and ions as discrete superparticles advanced using a particle-in-cell (PIC) approach. Since experimental data of the electron cross-field m...

The objective of this work was to characterize a novel appearance defect found in Cheddar cheese, heretofore referred to as black spot defect (BSD), and to determine an etiology. Uniformly distributed throughout the cheese mass, BSD appears as small spherical black spots from 0.20 to 4.7 mm in diameter and at an average frequency of about 2 spots per kg of cheese. To date, BSD has only been fou...

In a placebo controlled prospective clinical trial of bismuth salicylate in helicobacter pylori associated gastritis, 52 adult patients were randomly allocated to treatment with bismuth salicylate or placebo. Helicobacter pylori were totally cleared in 77% patients in bismuth group but none in placebo group (P less than 0.001). Resolution of gastritis (P less than 0.001) and improvement of symp...

bismuth salts and different antimicrobials including metonidazole & tetracyclines were used in the assessment of inhibition zone of helicobacter pylori cultures on solid media. antibiotics were used or in combined in order to find out their possible synergistic effects. it was showed that: only bismuth substrate and not then salts have antibacterial effects on helicobacter pylori and also on th...

BACKGROUND/AIMS Helicobacter pylori eradication rates with standard triple regimens are worsening, and alternative treatments are urgently needed in some populations. The present study aimed to compare the efficacy of bismuth-based quadruple and concomitant regimens. METHODS Consecutive Helicobacter pylori-positive patients with non-ulcer dyspepsia were randomized to receive one of two regime...