Biomedical subjects

A Israil

Publications and source records attributed to A Israil.

11 recordsLinked to original sources

PubMedDate not supplied

Hemolytic properties of some Aeromonas strains.

Considering the possible correlation between hemolytic and enterotoxigenic properties of Aeromonas strains mentioned in the literature, in the present work we studied the practical value of the hemolysis tests in the diagnosis of Aeromonas strains by using comparatively the hemolysis tube tests (with goat and sheep erythrocytes suspensions) as well as the technique on blood agar in aerobic conditions. There were studied comparatively 230 Aeromonas strains (different species: A. hydrophila, A. sobriae, A. caviae, A. veronii, A. salmonicida) isolated from different sources (meat products, fish of fresh waters, mussels, sea water, pipe water, diarrhoeal disease and animal faeces). The comparison among the used tests for proving the hemolytic activity of Aeromonas strains showed that: 61.89% and 56.51% from the total number of Aeromonas strains were hemolytic in the tube tests with 1% goat and 1% sheep erythrocytes suspensions respectively after 48 hrs followed by 51.72% and 48.25% strains by the 5% goat and 5% sheep blood agar plates respectively in anaerobiosis and after 48 hrs incubation at 37 degrees C. The highest incidence of hemolysin presence was pointed out in motile Aeromonas strains (A. hydrophila--60.11% and A. sobria--56.52%). Our results showing a high frequency of hemolytic activity among Aeromonas strains isolated especially in meat products are suggesting a possible correlation between the pathogenic potential and the hemolytic activity and are pleading for introduction of this test in the diagnosis of Aeromonas species.

Aerobiosis↗

PubMedDate not supplied

[Lantibiotics].

Lantibiotics synthesized by gram positive bacteria (Staphylococcus, Streptococcus, Bacillus, genera) are a special group of polycyclic polypeptides constituted of protein amino acids and unusual amino acids (i.e. lanthionine, beta-methyllantionine etc.) these last ones exhibiting interchain thioeter bridges and ring structures. Some lantibiotics are already used in medical therapy (nisin, gallidermin, epidermin) as well as for food preservation (nisin). Their special structures and synthesis have focused substantial scientific interest, the lantibiotics proving to be ideal experimental models not only for microbiology but also for biochemistry, molecular biology, gene technology and protein engineering in the purpose to get more insights in the fundamental aspects of the cell biology.

Animals↗

PubMedDate not supplied

Isolation of motile aeromonads from foods of animal origin.

The purpose of this work was to select an available medium for Aeromonads isolation as well as to point out the Aeromonads presence in different foodstuffs of animal origin. Out of 15 tested media for Aeromonas isolation, two media, were selected: DFS as control medium and AGOS medium, both giving superposable results. 404 samples of foodstuffs of animal origin were examined; Aeromonads testing was performed qualitatively and quantitatively. 142 samples with a positivity percent of 51.40% were qualitatively tested. 262 samples with a positivity percent of 48.85% were quantitatively tested.

Aeromonas↗

PubMedDate not supplied

[Current developments in the problem of prions and prion diseases].

The present paper reports data referring to the mechanism of the CNS degenerating process of prion origin, the role of the biological timing in prion diseases, the interrelations between the prion diseases and Alzheimer's disease, new data on the normal cell protein PrPc and prion protein in the PrPsc scrapie, the physico-chemical properties of the prion PrP-RN Am properties the presence of the nucleic acid in the structure of prion, interrelations between prion and AIDS/VISNA retroviruses. The paper underlines the importance, for the next decade of the molecular biology studies for clearing up: the complete structure of prion, the prion multiplication, the role of nucleic acid for the infectivity, at the molecular level, and molecular epidemiology of these cases.

Animals↗

PubMedDate not supplied

Studies concerning the hemagglutinant activity of some pathogenic and opportunistic pathogenic strains of genus Vibrio.

1606 bacterial strains, belonging to Vibrio genus (189 V. cholerae 0 : 1; 1091 V. cholerae nongroup 0 : 1 and 205 V. halophilic strains) of different sources of isolation, were studied, concerning their hemagglutinating behaviour to 5 different animal red blood cells (human, bovine, chicken, African green monkey and guinea pig) in mannose/fucose presence/absence. The study aimed to establish the spectrum of their hemagglutinating activity as well as any possible correlation between the source of isolation, serogroup etc and the HA-type/subtype. Mannose/fucose sensitive as well as mannose/fucose resistant hemagglutinins were exhibited by the different tested strains. As unknown behaviour, a noticeable hemagglutination only in the carbohydrate presence was recorded. The HA-types and subtypes in 861 V. cholerae nongroup 0 : 1 tested strains are presented.

Animals↗

PubMedDate not supplied