Analysis of the antigenic and immunogenic properties of protein M of the influenza virus by an immunoenzyme method

A test system permitting the detection of influenza virus protein M at a concentration of 0.1-0.5 ng/ml in ELISA has been developed. The use of this system made it possible to detect influenza viruses A and B directly in crude virus-containing material and clinical samples obtained from influenza patients. During the outbreak of influenza in the spring of 1983 ELISA was successfully used for the rapid diagnosis of influenza, and some of its advantages in comparison with the conventional immunofluorescence test were thus demonstrated. To overcome difficulties arising from the low immunogenic potency of protein M, in the process of obtaining diagnostic sera and ascitic fluids the animals were immunized with the conjugate of protein M and polyelectrolite, which ensured considerable activation of humoral immune response.     

Mathematical model of autoimmunity]

A mathematical model of autoimmunity is developed. This model is a system of two nonlinear differential equations, which describe the concentration dynamics of tissue cells and agressive lymphocytes. An analysis of the solutions shows that this model reproduces general behaviour of autoimmune diseases.     

Antigenic structure of Salmonella L forms studied by an immunoferritin method

The antigenic structure of the L-forms of salmonellae (S. typhimurium and S. typhi) in comparison with that of the initial bacterial cultures and revertant cultures was studied with the use of the immunoferritin method. The L-forms of salmonellae were found to retain an insignificant amount of O-antigen, as well as to have K-antigen on the surface of the cytoplasmic membrane, but in a lesser amount than the initial strains. In the cultures reverting from the L-forms of S. typhimurium and S. typhi the quantitative and qualitative characteristics of O- and K-antigens were completely restored.     

Test systems for biomonitoring based on membrane-bound enzyme complexes. V. Mixed-function monooxygenase induction in the liver microsomes of Lake Baikal fish

The content of cytochrome P450 and monooxygenase activity has been studied in the liver of Baikal fishes (Coregonus automnalis, Thymallus articus, Brachymystax lenok and Cottocomphorus greminsky). The administration of 3-methylcholanthrene increases considerably the level of metabolic activity of microsomal fraction and cytochrome P450 content in liver. The data of microsomal fractions of rats and fishes liver electrophoresis have shown that xenobiotic causes the synthesis of similar according to the molecular weight forms of cytochrome P450 in these animals. The induction of microsomal monooxygenase inhibits the lipid peroxidation of microsomal fraction.     

Viability of the R, S and M variants of Mycobacterium lacticolum under various preservation conditions

The survival rate of Mycobacterium lacticolum and the proportion between its R, S and M variants were studied in the course of 12 months under different conditions of storage (freeze-drying, under vaseline oil, in 0.85% NaCl solution and in distilled water). A high survival rate of the variants was found in cells freeze-dried in a protective medium containing 10% of sucrose +1% of gelatin as well as in a 0.85% solution of NaCl.The survival rate of te variants differed by 2--3 orders of magnitude in cells freeze-dried with sodium glutamate or suspended in distilled water. The proportion between the R, S and M variants in the population noticeable changed after storage under these conditions.     

理解运动行为抑制调控的新视角：乙酰胆碱门控氯离子通道受体

Acetylcholine, the first identified neurotransmitter, plays crucial roles in various brain functions. One well-known case is its involvement as an activating neurotransmitter in the regulation of locomotion. However, its inhibitory regulatory role, particularly in locomotion, remains poorly understood. In a study conducted by Polat et al., the authors investigated the inhibitory role of acetylcholine in locomotion in C. elegans. In this organism, the acetylcholine-gated chloride channel receptor consists of four subunits. The authors thoroughly examined the loss-of-function of each subunit in movement regulation. Interestingly, the mutant worms were still capable of performing various movements such as forward, backward crawling, and turning, suggesting that the overall movement was not significantly affected. However, quantitative behavior analysis revealed subtle yet significant differences in the timing and postures of the movement in these mutants. Furthermore, the authors employed optogenetics to stimulate a specific neuron involved in backward crawling and demonstrated that the loss-of-function of the receptors in individual neurons affects the transitioning between locomotion modes. This work provides evidence for the inhibitory regulatory role of acetylcholine in locomotion. The loss-of-function of acetylcholine-gated chloride channel receptors likely disrupts the balance of neuronal and circuit physiology, thereby affecting the regulation of locomotion. Moreover, this study highlights the powerful role of quantitative behavior analysis in discovering and understanding more sophisticated functions of neural circuits.     

Effect of Soviet bleomycin-bleomycetin on the body of animals in multiple parenteral administration]

Toxicity of bleomycetin was studied on 3 animal species (rats, rabbits and dogs). The antibiotic was administered intramuscularly and intravenously in various doses for a prolonged period of time. The death of the rats, rabbits and dogs treated with repeated lethal doses of bleomycetin was due to its toxic effect on the kidneys and probably lungs. The level of urea in the blood of the animals before death increased up to 300--400 mg %. Histological examination of the kidneys revealed the picture of glomerulonephritis. The lungs were highly plethoric and showed areas of alveolar collapse and consolidation consisting mainly of the collapsed alveolar epithelium. The liver was not affected by bleomycetin according to both the results of some functional tests and histological examination. tthe blood sugar level after bleomycetin administration was not altered significantly. The changes in the peripheral blood were not pronounced. An increased P wave, decreased R wave and deep S wave were seen on the ECG. Such deviitions may be due not only to the changes in the myocardium but also to the lung affection. When bleomycetiin was used repeatedly in nonlethal doses (1 mg/kg for rats, 1--2 mg/kg for rabbits and 0.25--0.5 mg/kg for dogs), the above changes were less pronounced or not manifested at all. No inhibitory effect on hemopoiesis is an important positive characteristics of bleomycetin, so that it compares very favourably with most other antitumor drugs.     

Seasonal changes in the cytochemical properties of the peritoneal mast cells in rats]

Contents of histamine, 5-hydroxytryptamine, functional state of heparinic proteoglycan have been studied in the rat peritoneal mast cells during various seasons of the year (January-February, May-June, July). In winter the mast cells have a high content of histamine and 5-hydroxytryptamine, heparinic proteoglycan of their granules is stained with both alcian blue and safranin. In summer (July) content of histamine in the mast cells is sharply decreased in comparison with that of 5-hydroxytryptamine and in May-June the content of both amines is decreased nearly to background values. Both during spring and summer periods heparinic proteoglycan of the mast cell granules is stained only with alcian blue and does not take safranin. A suggestion is made on independence of the seasonal changes of annual rhythmical pattern of histamine and 5-hydroxytryptamine contents in the mast cells. A conclusion is made concerning possible participation of the mast cell system of organs and tissues in the seasonal changes of biogenic amine levels in them.     

Mapping the xrs2 and him1 genes of Saccharomyces cerevisiae by a method based on the chromosome destabilization effect

The methods for chimeric chromosomes' destabilization and the standard tetrad analysis have been used for mapping of the yeast genes XRS2 and HIM1. The genes are localized in the right arm of chromosome IV in the following order: XRS2-31cM-ADE8-28.5cM-HIM1.