A case of V-type Hyperlipidemia with mycoses

Neurotrophin-3 (NT-3) has been crystallized in 2 forms. Orthorhombic crystals, space group P2(1)2(1)2, diffracted to 2.8 A and have cell dimensions a = 39.1 A, b = 54.0 A, and c = 65.5 A. The second form is space group P4(3)2(1)2, with cell dimensions a = b = 67.1 A, and c = 107.9 A. The tetragonal crystals diffract to 2.8 A at room temperature and 2.5 A at -100 degrees C. The unit cell dimensions change significantly upon freezing, a = b = 66.1 A, and c = 102.8 A. Phases for the orthorhombic form were obtained by molecular replacement using nerve growth factor as the search model. A partially refined model of the NT-3 dimer (75% complete) was then oriented and positioned in the tetragonal cell.     

Sulfur-bridged polycyclic aromatic compounds

When polycyclic aromatic hydrocarbons are heattreated with an excess amount of sulfur in evacuated closed tubing, they react with sulfur, liberating hydrogen sulfide; after removing unreacted sulfur, dark-colored compounds in the form of an amorphous solid are obtained. These compounds possess semiconductive properties; the electrical resistivity is greatly reduced from that of the original hydrocarbons. The ESR absorption of these compounds is characterized by the large g-value, which is due to sulfur-centered unpaired electrons.From these findings, with the results of chemical analysis, we can assume that the polycyclic aromatic nuclei crosslink with each other through the sulfur-bridges, which are good electron transport paths, and yield the aromaticity of the molecule. The sulfur-bridged polycyclic aromatic hydrocarbons can be considered as the structural model of chars and cokes. The ESR studies of a violanthrene-sulfur compound were carried out during its heat-treatment up to 1000°C.     

Photolysis of poly(3-buten-2-one), poly(4,4-dimethyl-1-penten-3-one), and poly(3-methyl-3-buten-2-one) in the presence of oxygen

Photolysis of poly(3-buten-2-one) (PMVK), poly(4,4-dimethyl-1-penten-3-one) (PBVK), and poly(3-methyl-3-buten-2-one) (PMIK) were carried out in dioxane under oxygen or nitrogen bubbling. The main chain degradations of PBVK and PMIK were quenched and polymeric peroxides were produced. The heat treatment of the polymer irradiated in the presence of oxygen promoted the degradation. The photodegradation of PMVK was enhanced in the presence of oxygen.     

High-power pulsed GaAs double-drift hybrid-read impatt diodes for X-band

Gallium-arsenide double-drift hybrid-Read Impatt diodes have been developed to deliver high peak and average powers in X-band. A peak power output of 35 W with 20% efficiency has been obtained at 8.3 GHz for 20% duty cycle. Peak power output of 32 W with 20% efficiency has been obtained at 8·6 GHz for a 25% duty cycle. Peak power output of 26 W with 21.5% efficiency has been obtained at 8.6. GHz for 33% duty cycle.     

Potentiodynamic analysis of surface oxides on carbon blacks

The potentiodynamic sweep technique was applied to detect surface oxides on carbon black (Vulcan XC-72) which was subjected to heat treatment, electrochemical and chemical oxidation and gas phase oxidation. The quinone-hydroquinone redox couple was observed in the potential range 50–1280 mV (vs n.h.e.). Analysis of the current-voltage curves yielded surface concentrations of 10^?10–10^?11 moles/cm² in agreement with other techniques. The various oxidation procedures resulted in an increase in surface oxide whereas heat treatment caused a decrease.