[ON THE ROLE OF RICKETTSIA RAOULTII IN THE EPIDEMIOLOGY OF RICKETTSIOSES IN RUSSIA].

The paper analyzes data on the prevalence and possible epidemiological importance of Rickettsia raoultii. The possible risk of infection in the population was assessed from the results of a serological study of patients after tick suction and from those of molecular biological determination of contamination of removed carriers. The place of Rickettsia raoultii among other rickettsia causing rickettsioses of a tick-borne spotted fever group is assessed in Russia.

[The problems of laboratory diagnostic of rickettsiosis of group spotted tick-bite fever in Russia].

The article presents analysis of modern techniques of laboratory diagnostic of rickettsiosis of spotted tick-bite fever group. Owing to drastic shortage of list of produced preparations and increasing of specter of detected types of rickettsia in Russia the new approaches to laboratory verification of diagnoses are needed. To detect antibodies to rickettsia of spotted tick-bite fever group can be recommended such techniques as reaction of indirect immune fluorescence and immune enzyme assay with antigens of corresponding types of rickettsia.

Effects of enhanced pacing modalities on health care resource utilization and costs in bradycardia patients: An analysis of the randomized MINERVA trial.

Background: Many patients who suffer from bradycardia and need cardiac pacing also have atrial fibrillation (AF). New pacemaker algorithms, such as atrial preventive pacing and atrial antitachycardia pacing (DDDRP) and managed ventricular pacing (MVP), have been specifically designed to reduce AF occurrence and duration and to minimize the detrimental effects of right ventricular pacing. The randomized MINimizE Right Ventricular pacing to prevent Atrial fibrillation and heart failure trial established that DDDRP + MVP pacing modality reduced permanent AF in bradycardia patients as compared with standard dual-chamber pacing (DDDR).

[THE IMPORTANCE OF STRESS-ECHOCARDIOGRAPHY FOR DIFFERENTIAL DIAGNOSTICS OF APNEA IN PATIENTS WITH PERMANENT ELECTROCARDIOSTIMULATION].

Unlabelled: Differential diagnostics of apnea regarded as an equivalent to angina or a manifestation of cardiac failure in patients with permanent electrocardiostimulation (PECS) encounters difficulties. Stress-EchoCG is the most adequate method of programmed high-frequency cardiac stimulation with the implanted pacemaker (PM) for excluding stress-induced myocardial ischemia in patients undergoing continuous stimulation of the right ventricle. The aim of the study was to assess the effectiveness and safety of stress-EchoCG by means of programmed high-frequency cardiac stimulation with the implanted PM for patients with single-chamber PECS and complaints of apnea.

[Optimization of Streptococcus equi subsp. zooepidemicus cultivation process--producer of hyaluronic acid].

Aim: Selection of high-mucoid morphotype of Streptococcus equi subsp. zooepidemicus (Streptococcus zooepidemicus) and study of its morphological, physiological, biochemical and technological characteristics for providing increased secretion of hyaluronic acid (HA).

Materials And Methods: Submerged cultivation was performed in 100 ml glass flasks without baffles or in 1.

[Synthesis and degradation of hyaluronic acid by bacteria of Streptococcus genus].

Modern data on metabolism of hyaluronic acid by bacteria from Streptococcus genus are presented. Several species of bacteria forming capsule from hyaluronic acid, which is analogous to glycosaminoglycan of vertebrates, are considered. Different aspects of hyaluronic acid synthesis are described: biochemical synthesis pathway, genetic basis, regulation of expression of genes belonging to hyaluronic acid synthesis operon.

Functional activity of peritoneal macrophages from sensitive and resistant mouse strains during intravaginal infection with herpes simplex virus type 2 and mucosal vaccination.

In the early period after intravaginal infection with herpes simplex virus type 2 (2 h), macrophages from sensitive DBA/2 mice were characterized by higher capacity to engulf the antigen, decreased function of the lysosomal apparatus, lower activity of cathepsin D, and reduced oxygen metabolism compared to cells from resistant BALB/c mice. Mucosal vaccination with herpes vaccine and hyaluronic acid promoted the increase in functional activity of macrophages and improved survival of sensitive mice (by 60%).

Molecular identification of a collection of spotted Fever group rickettsiae obtained from patients and ticks from Russia.

Thirty-one rickettsial isolates from ticks or patients in North Asian tick typhus (NATT) foci from the Ural region to the Russian Far East were obtained at the Omsk Research Institute of Natural Foci Infections between 1954 and 2001. Using citrate synthase (gltA) and outermenbrane protein a (ompA) gene sequencing, we identified these isolates as Rickettsia sibirica sensu stricto (25 isolates), R. sibirica strain BJ-90 (2 isolates), R.

[Genetic identification of rickettsiae of the tick-borne spotted fever group, isolated in the foci of tick-borne rickettsiosis].

A total of 25 rickettsial cultures of the tick-borne spotted fever (TBSF) group from the collection of the Research Institute of Infections in Omsk, isolated from different sources in the territory of the Russian Federation (from the Urals to the Far East) during the period of 1954-2001) were studied by the methods of genetic analysis. The fragments of the gene coding the outer-membrane protein of 190 kD (ompA) and synthetase citrate (gltA) of the rickettsiae under the study were sequenced. 23 isolates were identified as R.

[Genotyping of spotted tick fever rickettsiae, detected in Russia and Kazakhstan].

R. slovaca was first detected in the ticks D. marginatus gathered in the Stavropol Territory and the Voronezh Region (European Russia).

Ecology and epidemiology of spotted fever group Rickettsiae and new data from their study in Russia and Kazakhstan.

Rickettsiae represent a wide range of pathogenicity from classic and new pathogens to endosymbionts of eukaryotic cells. Recent studies of rickettsiae have widened the number of representatives of genus Rickettsia, especially in the spotted fever group (SFG). Rickettsiae of SFG are tick-borne microorganisms with effective transovarial and transstadial transmission.

Layer-by-layer crystallization and the role of fluctuations in free standing smectic films.

Specular x-ray reflectivity has been used to study the changes in the thermal fluctuation behavior of eight layer freely suspended N-(4-n-butoxybenzilidene)-4-n-octylaniline (4O.8) films during the process of successive layer-by-layer crystallizations. Each of these steps is preceded by the formation of an intermediate layer structure with in-plane hexatic ordering.

[Mechanisms for the therapeutic effect of herpes polyvaccines in chronic ophthalmic herpes and genital herpes].

Commercial inactivated culture polyvaccine against herpes simplex viruses (types 1 and 2) developed at D. I. Ivanovsky Institute of Virology promoted cessation of viremia.

[Development of a suppository form of the interferon inducer poludan and potentiation of its action by hyaluronic acid].

A promising dosage form of interferon inductor poludan has been developed for the treatment of patients with genital herpes and ophthalmic herpes: suppositoria. High interferon-producing and antiviral activity of poludan in suppositoria is potentiated by hyaluronic acid and antioxidants.

[Molecular mechanisms of autorepair of DNA double strand breaks].

The physical mechanism of interaction between nucleotides in intracellular liquid medium was studied. It was shown that during the contact between the thymine and guanine there exists a potential barrier the distance of about 10 A, which prevents the enzyme self-repairing in DNA after a double damage. All the remaining pairs of nucleotides have no such a barrier.

Biological and genetic characterization of Rickettsia sibirica strains isolated in the endemic area of the north Asian tick typhus.

Restriction fragment length polymorphism (RFLP) analysis of polymerase chain reaction-amplified gene fragments was used to characterize 24 isolates of spotted fever group rickettsiae previously identified as Rickettsia sibirica from their serologic properties. These strains were obtained in Russia between 1946 and 1991 from humans and different species of Ixodid ticks. The RFLP analysis was performed using amplified DNA products obtained with a genus-specific primer pair derived from the R.

[Mechanisms of the combined effect of SHF electromagnetic radiation and hydrogen peroxide on the viability of microorganisms].

The cellular (viability) and molecular (kinetics of changes in nucleoid viscosity) mechanisms of damage to various strains of microorganisms after single and combined action of SHF electromagnetic radiation and hydrogen peroxide are compared. The conditions are found in which marked synergetic interactions of the agents are realized. The role of repair systems in formation of final products of the interactions is discussed.

[Genotypic characteristics of Rickettsia sibirica strains].

Six Rickettsia sibirica strains isolated in Siberia and Far East (Primorje) from various sources (patient, ticks D. nuttali, D. silvarum, H.

[Comparative analysis of mechanisms of the modification of microorganism viability under the effect of UHF heating and hyperthermia].

In experiments with models of isogenic Escherichia coli strains, a comparative study was made of the effect of SHF of electromagnetic field and hyperthermia. The survival rate of bacteria was determined and, simultaneously, injuries to genetic supramolecular structures were registered through measuring the anomalous time dependence of cell lysate viscosity. The combined effects of the mixture of these factors with H2O2 microconcentrations were studied.

[The combined action of microwave radiation and hydrogen peroxide on the viability and ultrastructure of Pseudomonas aeruginosa cells].

The comparative study of the action of microwave radiation and hydrogen peroxide, as well as their combined action, on the viability and ultrastructure of P. aeruginosa cells has been made. The combined use of microwave radiation and hydrogen peroxide has been shown to decrease the viability of P.