Chitooligosaccharides (COSs) are a promising drug candidate and food ingredient because they are innately biocompatible, non-toxic, and non-allergenic to living tissues. Therefore, the impurities in COSs must be clearly elucidated and precisely determined. As for COSs, most analytical methods focus on the determination of the average degrees of polymerization (DPs) and deacetylation (DD), as we...

Updated estimates of the selenomethionine content of four NIST wheat reference materials have been obtained by use of a revised gas chromatography-stable-isotope dilution mass spectrometric method. The revised method makes use of digestion with methanesulfonic acid, which enables more complete recovery of endogenous selenomethionine than was previously achieved by overnight denaturing treatment...

Geographically MS describes three frequency zones. High frequency areas (prevalence 30+ per 100 000) now comprise most of Europe, Israel, Canada, northern US, southeastern Australia, New Zealand, and easternmost Russia. Medium frequency areas include southern US, most of Australia, South Africa, the southern Mediterranean basin, Russia into Siberia, the Ukraine and parts of Latin America. Preva...

Local and global sensitivity and uncertainty methods are applied to a box model of the dimethylsulfide (DMS) oxidation cycle in the remote marine boundary layer in order to determine the key physical and chemical parameters and sources of uncertainty. The model considers 58 uncertain parameters, and simulates the diurnal gas-phase cycles of DMS, SO2, methanesulfonic acid (MSA), and H2SO4 for cl...

A low-cost sensor array system for banana ripeness monitoring is presented. The sensors are constructed by employing a graphite line-patterning technique (LPT) to print interdigitated graphite electrodes on tracing paper and then coating the printed area with a thin film of polyaniline (PANI) by in-situ polymerization as the gas-sensitive layer. The PANI layers were used for the detection of vo...

residue (pGlu) at the N-terminal are widely known. The removal of pGlu residue from a pGlu-X-peptide (X, amino acid residue at position 2) is required for the primary structure determination by Edman degradation. Our previous studies indicated that pGlu-X peptide bond is highly sensitive to mild acidic conditions, generating not only the ring opened product (H-Glu-X-peptide) at the pyrrolidone ...

Bio-oil is a promising alternative source of energy produced from fast pyrolysis of biomass. Increasing the viscosity of bio-oil during storage is a major problem that can be controlled by the addition of methanol or other alcohols. This paper reports the results of our investigation of the reactions of short chain alcohols with aldehydes and acids in bio-oil. The reaction of methanol with hydr...

Institut für Zoologie IV der Universität Düsseldorf, Universitätsstraße 1, D-4000 Düsseldorf 1, Bundesrepublik Deutschland Z. Naturforsch. 42c, 225—230 (1987); received October 17, 1986 Corpora cardiaca, Hypertrehalosaemic Neuropeptide, Nauphoeta cinerea, Blood Carbohydrates, Fat Body Glycogen Phosphorylase Nauphoeta cinerea corpora cardiaca contain peptide material which is capable of elicitin...

The hydrometallurgical technology provides an efficient and sustainable green lead recovery process from acid batteries. Methanesulfonic has been widely considered as a solvent for electrolytic recovery. However, the competitive precipitation of PbO2 at anode higher overpotential OER limit efficiency. In this work, anodic oxygen evolution reaction (OER) catalyst with low Ir mass fraction 7.2% i...