Double dynamical regime of confined water

The Van Hove self correlation function of water confined in a silica pore is calculated from Molecular Dynamics trajectories upon supercooling. At long time in the $\alpha$ relaxation region we found that the behaviour of the real space time dependent correlators can be decomposed in a very slow, almost frozen, dynamics due to the bound water close to the substrate and a faster dynamics of the free water which resides far from the confining surface. For free water we confirm the evidences of an approach to a crossover mode coupling transition, previously found in Q space. In the short time region we found that the two dynamical regimes are overimposed and cannot be distinguished. This shows that the interplay between the slower and the faster dynamics emerges in going from early times to the $\alpha$ relaxation region, where a layer analysis of the dynamical properties can be performed.Comment: 6 pages with 9 figures. RevTeX. Accepted for pulbication in J. Phys. Cond. Mat

Supercooled confined water and the Mode Coupling crossover temperature

We present a Molecular Dynamics study of the single particle dynamics of supercooled water confined in a silica pore. Two dynamical regimes are found: close to the hydrophilic substrate molecules are below the Mode Coupling crossover temperature, $T_C$, already at ambient temperature. The water closer to the center of the pore (free water) approaches upon supercooling $T_C$ as predicted by Mode Coupling Theories. For free water the crossover temperature and crossover exponent $\gamma$ are extracted from power-law fits to both the diffusion coefficient and the relaxation time of the late $\alpha$ region.Comment: To be published, Phys. Rev. Lett., 4 pages, 3 figures, revTeX, minor changes in the figures, references added, changes in the tex

VLIYaNIE STATINOV V SRAVNENII S KAL'TsIEM I VITAMINOM D NA POKAZATELI KOSTNOGO METABOLIZMA I MINERAL'NUYu PLOTNOST' KOSTNOY TKANI (MPK) U ZhENShchIN S OSTEOPENIEY V POSTMENOPAUZE

An open clinical trial evaluating effects of Pravastatin (P) 20 mg, Fluvastatin (F) 40 mg versus Calcium-D3 Nycomed Forte (1000 mg calcium and 800 ME cholecalciferol - CaD3 ) on bone metabolism, bone mineral density (BMD) and lipid metabolism have been conducted. We studied 80 osteopenic women from 60 to 80 years old, divided into three groups: 30 participants were treated by CaD3 during 12 months, at the same time 30 ones applied P, and 20 women were treated by L for the 6 months. All of the remedies showed similar influence on the spine BMD (the basal BMD remained intact). CaD3 and L were able to prevent proximal hip from BMD loss whereas patients treated P proceeded to lose bone mass (up to 1.3-1.5%). We have found that CaD3 provides an antiresorptive action (СТх became 27.2% lower and OC -4.1%), that P doesn't touch bone metabolism indices and dual action of L: it suppress a bone resorption (СТх was 14,1% reduce) and show an invigorative action on bone formation (ОК 25,5% raised). The CaD3 treatment was the less expensive, and the highest cost had P course. Our comparative study reveals that CaD3 is preferable in solitary osteoporosis prevention. However when osteopenia or validity OP risk factors coexist with dyslipidemia, type II particularly, use of L may be rational because of it's 6th month therapy had rather equal effect to one of year CaD3 consumption

Khirurgicheskoe lechenie patsientov s bolezn'yu Itsenko-Kushinga

Болезнь Иценко-Кушинга является редким и тяжелым нейроэндокринным заболеванием, причиной которого, в большинстве случаев, является аденома гипофиза, развивающаяся из адренокортикотропных клеток. Это, в свою очередь, приводит к повышенной выработке адренокортикотропного гормона (АКТГ), с последующей активацией коры надпочечников и развитием гиперкортицизма с соответствующей клинической и лабораторной картиной [5, 8, 11]. Впервые заболевание было описано в 1912 г. американским нейрохирургом Г. Кушингом и впоследствии независимо от него в 1924 г. русским неврологом Н.М. Иценко. В настоящее время существует два патогенетических метода лечения БИК: хирургический (трансназальное или транскраниальное удаление опухоли) и лучевой (протонотерапия, «гамма-нож» и др.). По данным разных авторов [4, 9, 10] эффективность этих методов сопоставима друг с другом и достигает порядка 80-90%. Каждый метод имеет свои преимущества и недостатки, показания и противопоказания. Так, например, при наличии аденомы гипофиза отдается предпочтение хирургическому методу лечения, а при ее отсутствии лучевому [2, 3]. Современный уровень развития микрохирургической техники, в частности развитие эндоскопии, позволил в значительной степени повысить эффективность оперативного вмешательства, практически свести к нулю число серьезных осложнений и летальных исходов, а также минимизировать частоту развития таких осложнений, как несахарный диабет, пангипопитуитаризм, назальная ликворея и др