Anxiolytic effect of the extract from Rhaponticum uniflorum roots

The experiments were carried out on white Wistar rats. The dry extract from Rhaponticum uniflorum L. roots was administered to the animals at the doses of 200 and 300 mg/kg for 7 days before testing. The behavior of animals was observed with the use of the tests "elevated plus maze" (EPM) and "dark/ light chamber". Under the influence of the extract from Rhaponticum uniflorum L. at the doses of 100, 150 and 250 mg/kg the number of entries into the open branch of EPM rises to 2,0-3,0 times and staying period in them rises 3,1-4,1 times in comparison with the control. The test "dark/light chamber" has shown that the number of entries of the experimental animals into the light bay of the "dark/light chamber" and the period of staying in it is 2,0 times increased

ASSESSMENT OF DAMAGE AND EROSION WEAR OF THE ROTOR'SBLADES OF THE LAST TURBINE STAGES T-185/220-130 KIROV CHP-5

The assessment of damage and erosion wear of the rotor's blades of last stages of the turbine T-185/220-130 Kirov CHP-5 based on visual and ultrasonic examination, the photographs of the damages of the blades is done in the work.В работе дана оценка повреждений и эрозионного износа рабочих лопатокпоследних ступеней турбины Т-185/220-130 Кировской ТЭЦ-5 на основе визуального и ультразвукового исследования, приведены фотоснимки повреждений лопаток

ANTIOXIDANT ACTIVITY OF THE DRY EXTRACT RHAPONTICUM UNIFLORUM (L.) DC

A study of the antioxidant activity of the in vitro dry extracts DER-1 and DER-2 derived from Rhaponticum uniflorum (L.) DC. It was established that the extracts have pronounced antiradical activity against DPPH-radical binding (IC50 (DER-2) = 2.0 mkg/ml). When studying the effect of the dry extracts a number of reactive oxygen species (O•-2, NO) revealed that they exhibit their ability to inactivate. With respect to Of-anion radical extracts show moderate and against NO - expressed antiradical activity (IC50 (DER-2) = 311.0 mkg/ml). We also revealed the presence of moderate Fe2+-chelating activity of the extracts studied. This effect is caused by apparently content of phenolic compounds, phenol carbonic acids, triterpene saponins and tannins

Theory of anyon excitons: Relation to excitons of nu=1/3 and nu=2/3 incompressible liquids

Elementary excitations of incompressible quantum liquids (IQL's) are anyons, i.e., quasiparticles carrying fractional charges and obeying fractional statistics. To find out how the properties of these quasiparticles manifest themselves in the optical spectra, we have developed the anyon exciton model (AEM) and compared the results with the finite-size data for excitons of nu=1/3 and nu=2/3 IQL's. The model considers an exciton as a neutral composite consisting of three quasielectrons and a single hole. The AEM works well when the separation between electron and hole confinement planes, h, is larger than the magnetic length l. In the framework of the AEM an exciton possesses momentum k and two internal quantum numbers, one of which can be chosen as the angular momentum, L, of the k=0 state. Existence of the internal degrees of freedom results in the multiple branch energy spectrum, crater-like electron density shape and 120 degrees density correlations for k=0 excitons, and the splitting of the electron shell into bunches for non-zero k excitons. For h larger than 2l the bottom states obey the superselection rule L=3m (m are integers starting from 2), all of them are hard core states. For h nearly 2l there is one-to-one correspondence between the low-energy spectra found for the AEM and the many- electron exciton spectra of the nu=2/3 IQL, whereas some states are absent from the many-electron spectra of the nu=1/3 IQL. We argue that this striking difference in the spectra originates from the different populational statistics of the quasielectrons of charge conjugate IQL's and show that the proper account of the statistical requirements eliminates excessive states from the spectrum. Apparently, this phenomenon is the first manifestation of the exclusion statistics in the anyon bound states.Comment: 26 pages with 9 figures, typos correcte

New approach to the synthesis of polymethylsilsesquioxane dendrimers

Non-functional derivatives of polymethylsilsesquioxane (PMSSQ) dendrimers of first to fourth generation were synthesized for the first time using combination of divergent and convergent synthetic approaches. Obtaining of non-functional derivatives allowed investigating their properties not only in solution, but also in the bulk. While having practically identical chemical composition with linear polydimethylsiloxanes, PMSSQ dendrimers demonstrated increased density, a significant increase in the viscous flow energy, an absence of crystallization, and a gradual increase in the glass transition temperature with the generation