The crystal growth and properties of novel magnetic double molybdate RbFe5(MoO4)7 with mixed Fe3+/Fe2+ states and 1D negative thermal expansion

Single crystals of new composition RbFe₅(MoO₄)₇ were successfully grown by the flux method, and their crystal structure was determined using the X-ray single-crystal diffraction technique.

Cu2ZnSnS4 crystal growth using an SnCl2 based flux

Single crystal growth of Cu₂ZnSnS₄ in an SnCl₂-based flux.

Electronic structure of β-RbSm(MoO4)2 and chemical bonding in molybdates

Microcrystals of orthorhombic rubidium samarium molybdate, β-RbSm(MoO₄)₂, have been fabricated by solid state synthesis at T = 450 °C, 70 h, and at T = 600 °C, 150 h.

[Monitoring of enterovirus circulation in Irkutsk region]

AIM

Monitoring of circulation of enteroviruses (EVI) in Irkutsk Region and study of regional specter of circulating enteroviruses.

MATERIALS AND METHODS

1419 samples from patients with suspected EVI, contact in foci ofenterovirus infection, acute intestine infections and 964 samples of sewage water were studied in total. In 2011 isolation of viral agents from 97 samples positive on enterovirus by RT-PCR from patients with preliminary EVI diagnosis and 5 samples of sewage water of Irkutsk city was carried out. Transplantable line of human rhabdomyosarcoma RD cell culture was used for isolation of enteroviruses. Infection of cells and 2 serial passages of the studied material were carried out. The isolates were typed in neutralization reaction (NR) with a set of 32 diagnostic type-specific immune sera against viral poliomyelitis I-III; Coxsackie B1-6; Coxsackie A2, A4, A7, A9, A10; ECHO 68 - 71; ECHO 2, 4, 7, 8, 9, 12, 16, 20, 25, 26, 27, 29, 31, 33.

RESULTS

In 2011 circulation of enterovirus serotypes that were previously absent on the territory of the region was established: ECHO 68, ECHO 70, ECHO 71. These strains were isolated from patients, circulation of ECHO 70 serotype was established also in samples of sewage water. The analysis of enterovirus landscape carried out showed the possibility of complication of epidemic situation on the territory of the region due to change of serovariants of causative agents of non-polioenterovirus infections and detection ofepidemically significant enteroviruses - ECHO 68, 70 and 71 serotypes.

CONCLUSION

Determination of specter ofenterovirus serotypes, detection of serotypes that had not previously circulated in Irkutsk Region allows to prognose epidemic situation on morbidity of enterovirus infections and timely develop and make decisions for ensuring epidemiologic welfare of the population.

Molecular-beam epitaxy-grown Si whisker structures: morphological, optical and electrical properties

Scanning electron microscopy, spectroscopic ellipsometry, and current-voltage and current-temperature measurements were employed to characterize nanowhisker structures grown by molecular-beam epitaxy on Si(111) substrates. Small clusters of gold deposited on the Si surface were used as the seeds for nanowhisker growth. The diameter of grown nanowhiskers and their length ranged from 70 to 200 nm and from 580 to 890 nm, respectively. The whiskers were found to inherit the (111) orientation of the Si substrate. By means of spectroscopic ellipsometry in the range 1.5-4.77 eV, lateral optical inhomogeneity of the nanowhisker layer was revealed, with optical properties of the layer substantially differing from those of single-crystal Si. Electrical measurements point to the presence of a Schottky barrier with height 0.70 eV in the structure and to the presence of electrically active centers non-uniformly distributed over the nanowhisker length.

[Pharmaceutical aspects of creating an effective drug form of carfecillin]

Physical and technological parameters of carfecillin powder and carfecillin with auxiliary substances in the form of the powder mixture and granulate were studied comparatively. Possible preparation of carfecillin capsules characterized by high levels of the antibiotic dissolution was shown.