Study of the Ion Composition of the Diffuse Vacuum Arc on a Hot Cathode by the Time-of-Flight Method

Plasma Physics Reports - The study of a diffuse vacuum arc (DVA) is of interest in connection with the developing methods of plasma processing of the spent nuclear fuel (SNF). This type of...     

Formation of specifically transducing lambda alpha g-particles. I. Relationship between the quantitative composition of transductants and the type of inductive activity

To study the formation of specifically transducing particles, different physical and chemical prophage-inducing factors (spontaneous induction, UV and roentgen irradiation, treatment with mitomycin C and nalidixic acid). Each kind of induction used in this study was shown to bring about the formation of transducing particles. The kind of inducing action influenced the qualitative composition of transductants. DNA ruptures caused by inducing factor may be supposed to play the main role in the formation of specifically transducing lambda dg-genomes.     

The induction of the monooxygenase system and the incorporation of the radioactive label from 2-14C-lysine into the liver microsome fraction of rats exposed to phenobarbital against a background of deficiencies in lysine, methionine, threonine and vitamins A, C and E

The effect of diet on induction of monooxygenases and distribution of label from 2-14C-lysine in fractions of liver homogenate, muscle homogenate and blood of male rats treated with phenobarbital (80 mg/kg, three days) was studied. 2-14C-lysine was injected intraperitoneally 24 h before the first injection of phenobarbital. It was demonstrated that monoxygenase induction, increase of relative liver weight and incorporation of label from 2-14C-lysine into fractions of liver homogenate in phenobarbital-treated rats were more pronounced as compared with the similarly treated rats that were fed a balanced diet. The possibility of mobilization of deficient essential components to liver from other organs and tissues for maintenance of monoxygenase induction is discussed.     

Quantitative changes in gastric juice proteases in dogs during ulcer formation in the stomach]

Disc-electrophoretic investigation of proteases of the gastric juice of dogs under normal conditions and in experimental atophan ulcer of the stomach demonstrated that in fasting dogs ulceration was accompanied by marked quantitative changes in the protease spectrum. Fraction No. 6 showed a significant elevation against the background of total reduction of proteolytic fraction of the gastric juice in sham feeding of ulcerated dogs. Sham feeding replete ulcerated dogs indicated a marked increase of fractions No.1 and No.2. The noted changes of the gastric juice protease spectrum may be of ulcerogenic significance.     

Risk Factors for HIV and Unprotected Anal Intercourse among Men Who Have Sex with Men (MSM) in Almaty, Kazakhstan

Introduction

Men who have sex with men (MSM) are at high risk for HIV infection. MSM in Central Asia, however, are not adequately studied to assess their risk of HIV transmission. Methods: This study used respondent driven sampling methods to recruit 400 MSM in Almaty, the largest city in Kazakhstan, into a cross-sectional study. Participation involved a one-time interviewer-administered questionnaire and rapid HIV screening test. Prevalence data were adjusted for respondent network size and recruitment patterns. Multivariate logistic regression was used to investigate the association between HIV and selected risk factors, and unprotected anal intercourse (UAI) and selected risk factors.

Results

After respondent driven sampling (RDS) weighted analysis, 20.2% of MSM were HIV-positive, and 69.0% had unprotected sex with at least one male partner in the last 12 months. Regression analysis showed that HIV infection was associated with unprotected receptive anal sex (AOR: 2.00; 95% CI: 1.04–3.84). Having unprotected anal intercourse with male partners, a measure of HIV risk behaviors, was associated with being single (AOR: 0.38; 95% CI: 0.23–0.64); very difficult access to lubricants (AOR: 11.08; 95% CI: 4.93–24.91); STI symptoms (AOR: 3.45; 95% CI: 1.42–8.40); transactional sex (AOR: 3.21; 95% CI: 1.66–6.22); and non-injection drug use (AOR: 3.10; 95% CI: 1.51–6.36).

Conclusions

This study found a high HIV prevalence among MSM in Almaty, and a population of MSM engaging in multiple high-risk behavior in Almaty. Greater access to HIV education and prevention interventions is needed to limit the HIV epidemic among MSM in Almaty.     

Lysosomal enzyme activity of the gastric mucosa in rats during experimental ulcer formation

Lysosomal membrane stability has been studied in the gastric mucosa in response to mechanical damage caused by lysosomal fractionation and release of lysosomal enzymes from mucous cells into the gastric cavity of alive animals during induction of acetic ulcer or erosive damage of the gastric mucosa resulting from intraperitoneal introduction of histamine and serotonin. It has been found that all types of ulcerogenesis in the gastric mucosa led to the decrease in lysosomal membrane stability to mechanical stress in the course of lysosomal fractionation. In addition there was a substantial release of lysosomal enzymes into the gastric cavity in different types of ulcerogenesis. The decrease in lysosomal membrane stability combined with a subsequent development of ulcers and erosions in the gastric mucosa seems indicative of the fact that lysosomal enzymes take part in the initial formation of ulcers in the gastric mucosa.     

Glow Pause in a Helium Plasma at Room and Liquid Nitrogen Temperatures on Applying a Nanosecond Voltage Pulse to a Glow Discharge

The features of the relaxation of a quasi-steady glow discharge after extra excitation by a nanosecond high-voltage pulse are studied experimentally. It is shown that the plasma relaxation is characterized by the existence of a time interval with a low emission intensity—a glow pause. A kinetic model of the helium plasma relaxation is developed. It is shown that the nanosecond discharge that creates extra ionization and metastable atoms enables one to keep the electron temperature at a quasi-steady level within the range 0.05–0.5 eV for several hundred microseconds during the glow pause. The effect of the helium temperature on the glow pause features is investigated.     

Induction of monooxygenase system and incorporation of radioactivity from 2-14C-lysine into proteins of rat liver microsomes under the action of phenobarbital and the background of lysine, methionine, threonine and vitamin A, C and E deficiencies]

The effect of diet on induction of monooxygenases and distribution of radioactivity from 2-14-C-lysine in fractions of liver homogenate, muscle homogenate and blood of male rats treated with phenobarbital (80 mg/kg, three days) was studied. 2-14-C-lysine was injected intraperitoneally 24 h before the first injection of phenobarbital. It was demonstrated that monooxygenase induction, increase of relative liver weight and incorporation of radioactivity from 2-14-C-lysine into fractions of liver homogenate in phenobarbital-treated rats fed diet deficient in lysine, methionine, threonine and vitamins A, C and E were more pronounced as compared with the similarly treated rats which were fed a balanced diet. The possibility of mobilization of deficient essential components to liver from other organs and tissues for maintenance of monooxygenase induction is discussed.