Bragg Reflection Waveguide: Anti-Mirror Reflection and Light Slowdown

The effect of the light group velocity reduction in dielectric Bragg reflection waveguide structures (SiO$_2$/TiO$_2$) in the vicinity of the cutoff frequency is studied experimentally. The effect of anti-mirror reflection, specific for the Bragg reflection waveguides, is described and employed for detection of "slow light". The experiments were performed with the use of the Ti:sapphire laser pulses ~ 100 fs in length. The group index $n_g \sim$ 30 with a fractional pulse delay (normalized to the pulse width) of $\sim$ 10 is demonstrated. The problems and prospects of implementation of the slow-light devices based on the Bragg reflection waveguide structures are discussed.Comment: 11 pages, in the previous version, we failed to insert figure

Influence of recombinant erythropoietin on mesenchymal stem cells proliferation and differentiation during cultivation on allogenic bone matrix

Effectiveness of mesenchymal stem cells (MSCs) proliferation and differentiation was studied after addition of medicinal product containing human recombinant erythropoietin (rhEPO) into enriched culture medium with components for osteo- and angiogenesis. Cultivation of mesenchymal stem cells under static conditions using “cocktail” of growth factors and rhEPO allowed to populate allogenic discs-scaffolds with connective tissue formations with the participation of osteoblasts and elongated multicellular structures, which formed after endothelium-like cells fusio

Influence of recombinant erythropoietin on mesenchymal stem cells proliferation and differentiation during cultivation on allogenic bone matrix

Effectiveness of mesenchymal stem cells(MSCs) proliferation and differentiation wasstudied after addition of medicinal productcontaining human recombinant erythropoietin (rhEPO)into enriched culture medium with components for osteoandangiogenesis. Cultivation of mesenchymal stem cellsunder static conditions using “cocktail” of growth factorsand rhEPO allowed to populate allogenic discs-scaffoldswith connective tissue formations with the participationof osteoblasts and elongated multicellular structures,which formed after endothelium-like cells fusion. In thepresence of rhEPO MSCs differentiates more effectively inosteogenic direction than in angiogenic

Oxide phosphors for light upconversion; Yb3+ and Tm3+ co-doped Y2BaZnO5

Copyright 2011 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in Journal of Applied Physics 109, 063104 (2011) and may be found at

EPIDEMIOLOGY OF PRIMARY HIP ARTHROPLASTY: REPORT FROM REGISTER OF VREDEN RUSSIAN RESEARCH INSTITUTE OF TRAUMATOLOGY AND ORTHOPEDICS

The   paper   presents   data   analysis   of  the   Hip   Arthroplasty  Register   of  Vreden   Russian   Research   Institute of Traumatology and Orthopedics, namely information on 37373 primary THA performed at the Vreden Institute and at several other orthopedic centers and 1200 hip replacements at other hospitals of St. Petersburg.There were 1.5 times more women in the studied cohort than men. A significant predominance of women with dysplastic osteoarthritis (72.4%) and rheumatoid arthritis (82.1%) was reported. A male predominance was noted in patients with secondary osteoarthritis (53.1%), post-traumatic changes of hip (61.0%) and osteonecrosis of the femoral head (68.6 %). The mean age of patients was 58.0±12.9 years (95% CI from 57.9 to 58.1, median 59 years). Age data of the study revealed that  patients were 10-12 years younger than reported in the national  arthroplasty registers of other countries.Total  hip arthroplasty was performed  in the  absolute  majority  of patients – 37295  cases (99,8%).  Uncemented implants  were used in 59.3% of cases, hybrid – in 29.6%, cemented – in 10.2%, reverse-hybrid – in 0.9% of all patients. The  most  common  bearing  used  was metal  on  crosslink  polyethylene, which  was applied  in 50.1% of all cases of arthroplasty. The  type  of fixation  of the  implant,  and  the  use of different  bearings  varied  in different  age groups. The paper presents  not only the absolute  numbers  of the data, but also demonstrated the dynamics  of the changes in time starting from 2007.The  present  epidemiological  study  does not  claim the  absolute  completeness of the  presented data,  but  contains the  analysis of the  large number  of cases, comparable  with  follow-ups  of patients in some national  registers  of certain European countries. The authors  analyzed about  10% of all cases of hip replacements performed  on the territory of the Russian Federation in ten-year  period

Lanthanide-based thermometers: At the cutting-edge of luminescence thermometry

Present technological demands in disparate areas, such as micro and nanofluidics, micro and nanoelectronics, photonics and biomedicine, among others, have reached to a development such that conventional contact thermal probes are not accomplished to perform accurate measurements with submicrometric spatial resolution. The development of novel non-contact thermal probes is, then, mandatory, contributing for an expansionary epoch of luminescence thermometry. Luminescence thermometry based on trivalent lanthanide ions becomes very popular since 2010 due to the unique versatility, stability and narrow emission band profiles of the ions that cover the entire electromagnetic spectrum with relatively high emission quantum yields. Here we give a perspective overview on the field since the beginnings in the 1950’s until the most recent cutting-edge examples. The current movement towards the technique usage as a new tool for thermal imaging, early tumor detection and as a tool for unveil properties of the thermometers themselves or of their local neighborhoods is also summarizedpublishe