Induction and migration of cryptic/defective Salmonella enterica prophages as a consequence of infection with lytic phages is an additional factor in stability of a coevolutionary vector

The influence of infection of natural isolates of Salmonella enterica with lytic (nonlysogenic) phages on the expression of resident cryptic or defective prophages in host bacteria was studied. The induction of defective/cryptic phages after infection with nonlysogenic phages and packaging of bacterial chromosomal fragments in capsids of defective phages is demonstrated. This may lead to migration and wide distribution of both the genomes of defective phages per se and various fragments of the bacterial chromosome (including pathogenic islands) in new bacterial strains with concomitant change of their properties, the acquired new features of pathogenicity among them.This work was supported by EC PhageVet-P (contract no. FOOD-CT-2005-007224) and by the Russian Foundation for Basic Research (grant no. 08-04-00162-a). We gratefully acknowledge the support of organizations presenting the grants.info:eu-repo/semantics/publishedVersio

Dyslipidaemias in the elderly and the very old: gender differences

Background. Aging of the world population attracts attention to the elucidation of etiology factors triggering development of age-dependent systemic pathologies including atherosclerosis. We assessed the dynamics of lipid parameters changing and their gender differences in people aged 45 years and over. Methods. Total cholesterol, triglycerides (TG) and relative content of very low density lipoproteins (VLDL) and low density lipoproteins (LDL) in blood serum were measured by means of spectral analyzer and electrophoresis on acetate plates in 1650 patients (1167 women, 483 men) aged 45 yrs and over. The prevalence of dyslipidaemias was estimated by standard statistic methods. Results. In age period over 75 yrs the frequency of dyslipidaemias decreased from 81.0 % to 36,4 %. The most significant decrease concerned combined dyslipidaemia (CD) (4 times) and triglyceridemia (2 times). CD lowering in men observed through the age range of 45–90 yrs, in women – from 75 yrs and over. Frequency of hypercholesterolemia in men increased during 60-90 yrs and decreased in women in the period 45-75 yrs. In CD the relative increase of both VLDLand LDL was observed but the VLDL content elevation is associated with high mortality. Conclusion: Frequency of elevated TG and VLDL content in sera significantly decreased in men aged 60 yrs and over and in women aged 75 yrs and over