[Detection of markers of hepatitis B and D virus infection in biological media and dried blood spots.]

The aim of this study was to assess the rates of detection of the major markers of infection with hepatitis B and Delta (D) viruses in serum, saliva and dry blood dots (DBS) as a possible option for serological studies among the population of the endemic region in conditions of limited laboratory resources. For this purpose, paired samples of blood serum and DBS, blood serum and saliva from patients with chronic hepatitis B with Delta agent living in the Republic of Tyva, which is endemic for this disease. HBsAg was detected in 289 (100%) serum samples, in 88/92 (95.7%) saliva samples, in 60/80 (75%) DBS samples, stored three years at room temperature, and in 111/117 (94.9%) DBS stored one year at the same conditions. Anti-HBcore was detected in 209 (100%) serum samples, while in saliva and DBS samples this marker was detected in only 13.04% (12/92) and 19.7% (23/117), respectively. Anti-HDV antibodies in serum were detected in 209 (100%) samples collected from patients in 2017-2018. In saliva and DBS anti-HDV were not detected in any sample. This difference in the detection rates of anti-HBcore and anti-HDV might be accounted for the fact that the HBV core protein is a very strong immunogen, indusing the production of anti-HBcore in high concentrations. Probably, the concentration of anti-HDV is much lower, which explains its absence in saliva and DBS in patients with hepatitis B+D. Samples of biological media (saliva), as well as DBS can serve as an alternative material for the detection of HBsAg in screening and research prevalence studies. Meanwhile, the definition of anti-HDV in such media is not possible due to the false negative results. Due to the high probability of superinfection with HDV in patients with HBV in endemic areas, the detection of HBsAg in alternative media (saliva or DBS) should be followed by testing for anti-HDV in serum samples.

[The detection of antibodies to endogenous bioregulators for evaluating functional condition of health of portsmen.]

The evaluation of functional condition of health of sportsmen doing Greek Roman wrestling was implemented using detection of level of antibodies to serotonin, histamine, dopamine, glutamate, GABA, orphanine, endorphin, angiotensin. The study established a reliable increasing of level of antibodies to orphanine, β-endorphin, GABA and glutamate under increasing of duration of physical load. The content of antibodies to other regulators of adaptation had no statistical difference. The developed technique can be applied in evaluation of objectification of functional condition of sportsman with purpose of selecting optimal training process.

Influence of pyridine-like ligands on the structure, photochemical and biological properties of nitro-nitrosyl ruthenium complexes

The photochemical properties and cell toxicity of monomeric and dimeric complexes of RuNO with methyl substituted pyridines and NO₂were investigated.

[Features of morbidity community-acquired pneumonia among young recruits]

Were examined 3338 military personnel of the combined training center. 183 of them diagnosed community-acquired pneumonia, in 3155 focal and infiltrative changes in lung tissue were not identified. The analisys of prevalence been made among young recruits of the acute respiratory illness before arriving in part and at the assembly point, foci of chronic infection, smoking, low body weight. 511 military personnel arrived at the training center in the disease state with symptoms of acute respiratory illness. Examined the relationship these risk factor to the development of community-acquired pneumonia in this category of servicemen.

[Characteristics of phages of spore-forming bacteria isolated from the soil]

Phages lyzing spore forming bacteria were isolated from soil, and their biological properties and fine structure were studied. The spectrum of lytic activity was determined as well as parameters of the intracellular phage growth. The burst size of the phage varies from 8 to 725 particles per infected cell, the latent period lasts 25-100 min for various phages. According to the data of electron microscopy, the phages are divided into three morphological groups. The phages Tg7, AR13 and BPP10 have a complex structure.

[Methylation of DNA of 1P+F phage for Bacillus brevis var. G-B]

DNA from a virulent mutant of the temperate 1P+f phage for Bacillus brevis var. G-B belongs to AT-type (GCequals34.5 mole %) and contains 5-methylcytosine (0.17 mole %) and N6-methyladenine (0.32 mole %). The amount of these minor bases in the phage DNA does not depend on the bacterial host (P- and S-variants of Bac.brevis var. G.-B). In contrast to the host DNA and heterologous DNA from Pseudomonas aeruginosa cells, DNA of 1P+f phage does not accept methyl groups from (methyl-3H)-S-adenosyl methionine on being methylated in vitro by enzymes from Bac. brevts cells. Thus, these phage DNA are fully methylated in vivo. The character of methylation of phage DNA in the cells of different Bac. brevis var. G-B variants is the same, i.e. dissociation of Bac. brevis var. G-B is not accompanied by any changes in the specificity of DNA methylation. In 1P+f DNA 5-methylcytosine is contained in all pyrimidine isopliths, the maximum quantity of this base (27%) is established to be present in dipyrimidine clusters. In host DNA all 5-methylcytosine localization in mono- and dipyrimidine fragments at a ratio of 1:1. This means that the specificity of methylation of cytosine residues in host and phage DNA in Bac. brevis var. G-B cells is quite different. This difference seems to be due to a specific methylase(s) induced by phage 1P+f which participates in the phage DNA methylation in vivo in addition to host enzymes.

[Certain practical problems of recognition and treatment of cardiac rhythm disorders]

Having briefly touched upon the problem of terminology and classification of arrhythmias the authors consider the diagnosis and clinical evaluation of some disorders, including the extrasystole (the significance of the extrasystolic interval), ectopic arrhythmias from the region of the atrio-ventricular junction (with simultaneous consistent or transent disruption of the intraventricular conduction), isolated atrial tachycardia, some variants of auricular fibrillation, flutter paroxysms, paroxysms of ventricular tachycardia, with continued auricular fibrillation in particular, and also the earlier described electrocardiographic phenomenon tentatively interpreted as sinistroatrial fibrillation with dextraatrial tachycardia, as well as major types of disrupted condution. The authors give a brief exposure of their views as to the principles of the treatment. Emphasis is placed on the importance of a comprehensive clinical approach to the diagnostic matters and to the evaluation of arrhythmias, as well as to the fundamental need to define more precisely the pathogenesis of the disturbed rhythm in a concrete patient so as to adopt an effective treatment.