The angular and energetic distribution of alpha particles from the Rn chain in air incident on a detector have been determined by the Monte Carlo method. Stopping power of alpha particles in air have been taken from the ICRU49 report. The incident alpha-particle spectrum was found for various equilibrium factors. It has been shown that the spectrum between 5.5 and 7.69 MeV depends on the equili...

The major outer membrane proteins from Escherichia coli K-12 are modified to contain alpha-aminoadipic acid delta-semialdehyde (allysine). The allysine was found to be derived from lysine and it was identified by derivatizing it to chloronorleucine by reduction, alpha-aminoadipic acid by oxidation, and to alpha,epsilon-diaminopimelic acid by reacting it with CN- and NH3. The alpha-aminoadipic a...

S-adenosylmethionine decarboxylase (AdoMetDC), a key enzyme in the biosynthesis of spermidine and spermine, is first synthesized as a proenzyme, which is cleaved posttranslationally to form alpha and beta subunits. The alpha subunit contains a covalently bound pyruvoyl group derived from serine that is essential for activity. With the use of an Escherichia coli overexpression system, we have pu...

Alpha-cyclodextrin complexes with linear alpha,omega-dicarboxylic acids were investigated by electrospray mass spectrometry. These hydrophobic complexes are known to have an equilibrium binding constant that increases with the diacid chain length. However, the electrospray mass spectrometry (ES-MS) spectra showed that the relative intensity of the complex did not vary significantly with chain l...

OBJECTIVE To identify and recombine a protein of the human dermal microvascular endothelial cell (HDMEC) that specifically reacts with anti-endothelial cell antibody (AECA) in the serum of patients with Behçet's disease (BD), and to evaluate the usefulness of this protein in BD. METHODS The proteomics technique, with 2-dimensional gel electrophoresis and matrix-assisted laser desorption ioniz...

The structure of an anti-diabetic polysaccharide (TAP) obtained from the fruiting bodies of Tremella aurantia was investigated by methylation analysis, Smith degradation, partial acid hydrolysis, 13C-NMR spectrometry, and enzymatic digestion. The results suggested that TAP was composed of (1-->3)-linked alpha-D-mannopyranosyl residues as a backbone, some of which were substituted at position 2 ...

Pulse shape analyzers have been introduced in commercial liquid scintillation counters, such as the WaIlac 1220 QuantulusTM and 1219 SM, enabling separation of alpha particle spectra from other types of radiation in a single measurement and making ultra sensitive alpha counting possible. Background count rates as low as one count per day for 214Po in a teflon vial are achievable while still ret...