A novel approach is described for the selection of optimal instrument parameters that yield a mass spectrum which best replicates the molecular mass distribution of a synthetic polymer. The application of implicit filtering algorithms is shown to be a viable method to find the best instrument settings while simultaneously minimizing the total number of experiments that need to be performed. Thi...

The effects of media components, including carbon source, KH2PO4, and vitamin B1, on the production and quality of Agaricus brasiliensis S. Wasser et al. (=A. blazei Murrill ss. Heinem) exopolysaccharides (ABEP) were studied in submerged culture. The quality of ABEP was characterized on the basis of their stimulation of the release of tumor necrosis factor-alpha (TNF-a) by macrophage cell line ...

A recalculation of the global changes of thermospheric gas composition, resulting from strong heat inputs in the aurora1 ovals, shows that (contrary to some previous suggestions) widespread increases of mean molecular mass are produced at mid-latitudes. in summer and at equinox. Decreases of mean molecular mass occur at mid-latitudes in winter. Similar results are given by both the ‘UCL’ and ‘N...

The PR oxidase, an extracellular enzyme, involved in the conversion of PR toxin into PR acid, was purified from the culture broth of Penicillium roqueforti ATCC 48936. The enzyme has a pI of 4.5 and a molecular mass of approximately 88 kDa, and it is a monomer. The optimum pH for this enzyme is ca. 4.0, and the optimum temperature is 50 degreesC.

The angular intensity distributions of CO and N(2) molecules scattered from a LiF(001) surface have been measured as functions of surface temperature, incident translational energy, and incident azimuthal direction affecting surface corrugation at a high resolution. Although both molecules have the same molecular mass and linear structure, only the CO molecule shows a rainbow feature in its sca...

Size, weight and position are three of the most important parameters that describe a molecule in a biological system. Ion mobility spectrometry is capable of separating molecules on the basis of their size or shape, whereas imaging mass spectrometry is an effective tool to measure the molecular weight and spatial distribution of molecules. Recent developments in both fields enabled the combinat...

A lattice Boltzman model for the simulation of binary mixtures is presented. Contrary to previous models, the present formulation is able to simulate mixtures with different Schmidt numbers and arbitrary molecular mass ratio of the components. In the hydrodynamic limit, the Navier-Stokes and the Stefan-Maxwell binary diffusion equations are recovered. The model is used for the simulation of bin...

A convenient method was worked out which discriminates between inhibitory activity of compounds against Bacillus subtilis transformation and their antibacterial or growth inhibition activity. By this assay system, several drugs and antibiotics were tested and some of them were found to be more inhibitory to transformation than to bacterial growth. This method was further applied to look for spe...

A preferential interaction quadratic isotherm model for hydrophobic interaction chromatographic systems is presented in this paper. In this isotherm, the nonlinear effect of salt on the capacity factor is described using the preferential interaction model developed by Perkins et al. [J. Chromatogr. A, 766 (1997) 1]. This is then coupled with a quadratic nonlinear isotherm to describe nonlinear ...

BACKGROUND Plasma contains thousands of proteins, but a small number of these proteins comprise the majority of protein molecules and mass. CONTENT We surveyed proteomic studies to identify candidates for high-abundance polypeptide chains. We searched the literature for information on the plasma concentrations of the most abundant components in healthy adults and for the molecular mass of the...