PubMed Health⌕ Search

Biomedical subjects

S A Moĭsiadi

Publications and source records attributed to S A Moĭsiadi.

At least 19 recordsLinked to original sources
PubMedDate not supplied

[Comparative study of the effectiveness of the purification and concentration of herpes simplex virus types 1 and 2].

The results of comparative studies on concentration and purification of herpes simplex virus type 1 and type 2 (HSV-1 and HSV-2) by ficol density gradient centrifugation are presented. A two-phase distribution of extracellular HSV was established in phycol density gradient centrifugation: in zones with density of 1.110-1.114 and 1.088-1.085 g/ml. The effectiveness of purification of HSV preparations recovered from the corresponding gradient zones was determined by electron microscopy and quantitation of the contaminating cellular (radioactive) proteins in virus purification from a mixture of the culture fluid from infected cultures and the culture fluid from uninfected labeled human embryo skin-muscle tissue cultures (HESM) and a mixture of unlabeled extracellular HSV and a homogenate of labeled uninfected HESM cultures. In HSV purification from the virus-containing culture fluid the amount of cellular proteins was shown to decrease 500-fold in 150-fold virus concentration. In purification of extracellular HSV from the mixture with cell homogenate the amount of cellular proteins decreased 70- and 100-fold for HSV-2 and HSV-1, respectively. The infectious virus yield in phycol gradient centrifugation of a precipitate obtained by the addition of polyethylene glycol-6000 to the culture fluid for HSV-1 was 34.7% (in titrations in HESM cultures) and 38.4% (by intracerebral inoculation of mice weighing 5-6 g), and for HSV-2 20.2% and 26.3%, respectively.

Animals↗
PubMedDate not supplied

[Development of test systems of immunoenzyme analysis for the rapid diagnosis of rotavirus infection].

A test system of enzyme immunoassay (EIA) consisting of simian rotavirus SA-11 and rabbit antiserum has been developed for the detection of rotavirus antigen. Direct EIA was used for tests on stool specimens from 289 children varying in ages from 10 days to 12 years suffering from acute enteric infections and 56 normal children. The antigen was detected in 22.1% and 3.5%, respectively, in patients predominantly in the first 3 days of the disease and most frequently in cases running as gastroenteritis. The results are discussed with reference to the possibility of the development of rotavirus carrier state and mixed virus-bacteria infections.

Acute Disease↗
PubMedDate not supplied

[Morphological characteristics of the rotaviruses and the structure of their genome].

The data on human and animal rotavirus reproduction in monkey kidney cell culture, their morphology, and genome structure are presented. Both viruses, simian rotavirus SA 11 and human rotavirus K1, did not differ morphologically, in both cases two-capsid and one-capsid particles were found. The genome structure was determined by electrophoresis in 6% PAG. The electrophoretic mobility of genome fragments of both viruses was similar.

Animals↗
PubMedDate not supplied

[Rapid diagnosis of rotavirus infections by RNA electrophoresis on polyacrylamide gel].

A method of rapid diagnosis of rotavirus infections is described. It is based on the isolation of viral RNA from the feces of patients with viral gastroenteritis and determination of RNA mobility by 6% polyacrylamide gel electrophoresis. It was demonstrated that rotavirus infection could be diagnosed after long-term storage of fecal specimens as well. The method is of interest for epidemiological and genetic studies of human rotavirus diseases.

Electrophoresis, Polyacrylamide Gel↗
PubMedDate not supplied

[Differences in the gene structure of the matrix protein and hemagglutinin in remantadine-resistant and -sensitive variants of the influenza virus type A FPV].

The oligonucleotide mapping technique and RNA-RNA hybridization revealed structural differences between the HA- and M-protein genes of two variants of influenza A FPV, remantadine-sensitive and remantadine-resistant ones. A quantitative estimation of the structural divergence of the two influenza FPV pairs of genes was carried out. The possible functional role of the differences in the structure of the HA- and M-protein genes of the two FPV variants is discussed.

Adamantane↗
PubMedDate not supplied

[Modelling of viral-chemical carcinogenesis in chronic infection in mice caused by the herpes simplex type 2 virus].

The influence of chronic herpetic infection of white mice caused by herpes simplex virus type 2 (HSV-2) on the blastomogenic effect of a polycyclic hydro-carbon, 20-methylcholanthrene (20-MCA), was studied. Solid tumors developed in 20-MCA-treated mice on the side of the carcinogen administration within 81--89 days. The simultaneous administration of 70 intracerebral LD50 of HSV-2 subcutaneously into a hind leg pad and 0.1 mg 20-MCA subcutaneously into the inguinal area was accompanied by a synergistic action of the two factors. The number of tumors in the animals treated with HSV-2 in combination with 20-MCA at all intervals of observation was 1.5--2.5 times greater than in mice treated with 20-MCA alone. Mice weighing 10--12 g were more sensitive to the synergistic effect of HSV-2 and 20-MCA, whereas animals weighing 25--30 g were more sensitive to the carcinogenic effect of 20-MCA alone. No tumors developed in mice infected with HSV-2 alone by 167 days (the observation period). Mice weighing 10--12 g were found to be more sensitive to the fatal effect of HSV-2 and HSV-2 plus 20-MCA, particularly in the first 2--3 weeks after inoculation. Six months after inoculation with HSV-2 the virus was isolated from posterior root ganglia of the sacral and lumbar spinal cord by cocultivation of the ganglia with human embryo skin-muscle tissue cells.

Animals↗