Saturation effects in the sub-Doppler spectroscopy of Cesium vapor confined in an Extremely Thin Cell

Saturation effects affecting absorption and fluorescence spectra of an atomic vapor confined in an Extremely Thin Cell (cell thickness $L < 1 \mu m$) are investigated experimentally and theoretically. The study is performed on the $D_{2}$ line ($\lambda ~= ~852 nm)$ of $Cs$ and concentrates on the two situations $L = \lambda /2$ and $L =\lambda$, the most contrasted ones with respect to the length dependence of the coherent Dicke narrowing. For $L = \lambda /2$, the Dicke-narrowed absorption profile simply broadens and saturates in amplitude when increasing the light intensity, while for $L =\lambda$, sub-Doppler dips of reduced absorption at line-center appear on the broad absorption profile. For a fluorescence detection at $L =\lambda$, saturation induces narrow dips, but only for hyperfine components undergoing a population loss through optical pumping. These experimental results are interpreted with the help of the various existing models, and are compared with numerical calculations based upon a two-level modelling that considers both a closed and an open system.Comment: 11 pages, 12 figure

Organizational and economic directions of competitive recovery of Russian pharmaceutical enterprises

The urgency of the analyzed issue is due to the fact that the sustainable development of the economy of any country is the most important level of public health, which in turn, is conditioned by providing high quality pharmaceutical products. This is determined by the effective activity of the pharmaceutical industry, its competitiveness. Thus, the study of the competitiveness of Russian pharmaceutical enterprises, the development directions of its improvement should contribute to the sustainable development of the Russian economy. The article is focused on the development of organizational and economic ways of competitive recovery of the pharmaceutical industry. The leading approach to the study of this issue is an analytical approach that allows identifying the main directions of competitive recovery of the pharmaceutical industry. The results of the article: the study of possible organizational and economic ways of competitive recovery of Russian companies in the pharmaceutical industry, the algorithm of directions of its increase. The made recommendations have been tested in a number of Russian companies in the pharmaceutical industry. The article date may be useful in the management of the pharmaceutical industry now, as well as for understanding the specifics of the domestic pharmaceutical industry. © 2016 Ashmarina et al

Computer Experiments for Function Approximations

This research project falls in the domain of response surface methodology, which seeks cost-effective ways to accurately fit an approximate function to experimental data. Modeling and computer simulation are essential tools in modern science and engineering. A computer simulation can be viewed as a function that receives input from a given parameter space and produces an output. Running the simulation repeatedly amounts to an equivalent number of function evaluations, and for complex models, such function evaluations can be very time-consuming. It is then of paramount importance to intelligently choose a relatively small set of sample points in the parameter space at which to evaluate the given function, and then use this information to construct a surrogate function that is close to the original function and takes little time to evaluate. This study was divided into two parts. The first part consisted of comparing four sampling methods and two function approximation methods in terms of efficiency and accuracy for simple test functions. The sampling methods used were Monte Carlo, Quasi-Random LP{sub {tau}}, Maximin Latin Hypercubes, and Orthogonal-Array-Based Latin Hypercubes. The function approximation methods utilized were Multivariate Adaptive Regression Splines (MARS) and Support Vector Machines (SVM). The second part of the study concerned adaptive sampling methods with a focus on creating useful sets of sample points specifically for monotonic functions, functions with a single minimum and functions with a bounded first derivative

Sub-Doppler spectroscopy of Rb atoms in a sub-micron vapor cell in the presence of a magnetic field

We report the first use of an extremely thin vapor cell (thickness ~ 400 nm) to study the magnetic-field dependence of laser-induced-fluorescence excitation spectra of alkali atoms. This thin cell allows for sub-Doppler resolution without the complexity of atomic beam or laser cooling techniques. This technique is used to study the laser-induced-fluorescence excitation spectra of Rb in a 50 G magnetic field. At this field strength the electronic angular momentum J and nuclear angular momentum I are only partially decoupled. As a result of the mixing of wavefunctions of different hyperfine states, we observe a nonlinear Zeeman effect for each sublevel, a substantial modification of the transition probabilities between different magnetic sublevels, and the appearance of transitions that are strictly forbidden in the absence of the magnetic field. For the case of right- and left- handed circularly polarized laser excitation, the fluorescence spectra differs qualitatively. Well pronounced magnetic field induced circular dichroism is observed. These observations are explained with a standard approach that describes the partial decoupling of I and J states

Dynamics of false vacuum bubbles in Brans-Dicke theory

We study the dynamics of false vacuum bubbles in the Brans-Dicke theory of gravity by using the thin shell or thin wall approximation. We consider a false vacuum bubble that has a different value for the Brans-Dicke field between the inside false vacuum region and the outside true vacuum region. Within a certain limit of field values, the difference of field values makes the effective tension of the shell negative. This allows new expanding false vacuum bubbles to be seen by the outside observer, which are disallowed in Einstein gravity.Comment: 29 pages, 20 figure

Burgers' Flows as Markovian Diffusion Processes

We analyze the unforced and deterministically forced Burgers equation in the framework of the (diffusive) interpolating dynamics that solves the so-called Schr\"{o}dinger boundary data problem for the random matter transport. This entails an exploration of the consistency conditions that allow to interpret dispersion of passive contaminants in the Burgers flow as a Markovian diffusion process. In general, the usage of a continuity equation $\partial_t\rho =-\nabla (\vec{v}\rho)$, where $\vec{v}=\vec{v}(\vec{x},t)$ stands for the Burgers field and $\rho$ is the density of transported matter, is at variance with the explicit diffusion scenario. Under these circumstances, we give a complete characterisation of the diffusive transport that is governed by Burgers velocity fields. The result extends both to the approximate description of the transport driven by an incompressible fluid and to motions in an infinitely compressible medium. Also, in conjunction with the Born statistical postulate in quantum theory, it pertains to the probabilistic (diffusive) counterpart of the Schr\"{o}dinger picture quantum dynamics.Comment: Latex fil

Resonant nonlinear magneto-optical effects in atoms

In this article, we review the history, current status, physical mechanisms, experimental methods, and applications of nonlinear magneto-optical effects in atomic vapors. We begin by describing the pioneering work of Macaluso and Corbino over a century ago on linear magneto-optical effects (in which the properties of the medium do not depend on the light power) in the vicinity of atomic resonances, and contrast these effects with various nonlinear magneto-optical phenomena that have been studied both theoretically and experimentally since the late 1960s. In recent years, the field of nonlinear magneto-optics has experienced a revival of interest that has led to a number of developments, including the observation of ultra-narrow (1-Hz) magneto-optical resonances, applications in sensitive magnetometry, nonlinear magneto-optical tomography, and the possibility of a search for parity- and time-reversal-invariance violation in atoms.Comment: 51 pages, 23 figures, to appear in Rev. Mod. Phys. in Oct. 2002, Figure added, typos corrected, text edited for clarit

Случай первично множественного синхронного радиоиндуцированного рака в клинической практике

There is an increase in the number of patients with secondary malignant neoplasms. In addition, in some subgroups after radical cancer treatment, the lifetime risk of developing secondary malignant neoplasms can be as high as 33 %. Secondary malignancies remain an important cause of death in patients who have received radical cancer treatment. The presented clinical case demonstrates the risk of developing primary multiple malignant neoplasms after radiation therapy and chemotherapy. A 39-year-old patient with diffuse large B-cell non-Hodgkin lymphoma underwent definitive treatment including chemo-and radiotherapy. Ten years later, the patient developed the induced multiple malignant tumors: a malignant neoplasm of the heart — myofibrosarcoma of the right ventricle with invasion of the anterior wall of the right ventricle Stage IIIB G2T3N0M0, left breast cancer Stage IIIA T3N2M0. The choice of treatment tactics for this category of patients remains particularly difficult.В структуре заболеваемости наблюдается рост числа пациентов с вторичными злокачественными новообразованиями. Кроме того, в отдельных подгруппах после радикального лечения рака пожизненный риск развития вторичных злокачественных новообразований может достигать 33 %. Вторичные злокачественные новообразования остаются важной причиной смерти пациентов, получивших радикальное лечение по поводу рака. Представленный клинический случай демонстрирует развитие первично-множественных злокачественных новообразований после лучевой терапии и химиотерапии. Пациентка в 39 лет по поводу диффузной крупноклеточной В-клеточной неходжскинской лимфомы прошла радикальный курс лечения. Через 10 лет у пациентки были выявлены радиоиндуцированные первично множественные опухоли: злокачественная миофибросаркома правого желудочка сердца IIIB стадии — G2T3N0M0, рак левой молочной железы IIIA стадии — T3N2M0. Определение тактики лечения для данной категории больных остается особенно сложным

Analysis of recombinant VEGF gene expression by genetically modified umbilical cord blood mononuclear cells in experiment in vivo

To obtain a significant therapeutic effect transplanted genetically modified cells should have an enhanced ability to survive and active expression of the therapeutic gene. In this paper, by using immunofluorescent staining we investigated the functional activity of the gene-cell formulation designed to deliver a therapeutic gene into the area of regeneration. As a model we used transgenic SOD1-G93A mice with amyotrophic lateral sclerosis phenotype which received xenotransplantation of human umbilical cord blood mononuclear cells, genetically modified with adenoviral expression vector encoding vascular endothelial growth factor (VEGF) and the reporter green fluorescent protein (EGFP). Results of the study allowed to establish not only the duration of survival of transplanted cells, but also the efficiency of expression of recombinant genes in genetically modified cells in vivo. Double immunofluorescent staining with antibodies against human nuclear antigen HNA and VEGF detected HNA+/VEGF+ cells in the terminal stage of disease 15 weeks after transplantation. These data suggest that genetically modified umbilical cord blood mononuclear cells, transplanted into SOD1-G93A transgenic mice, are able to penetrate the blood-brain barrier and migrate into the area of degeneration of nerve tissue and survive from the time of transplantation until the death of animals at the terminal stage of disease. At that time adenoviral expression vector encoding therapeutic gene is functionally active in transplanted cells, and secretory products of recombinant gene act on target cells by a paracrine mechanism

Клинический случай лечения метастатического почечноклеточного рака комбинацией ниволумаба с кабозантинибом в рутинной клинической практике

According to GLOBOCAN, there were about 18 million new cases of cancer and 9.6 million deaths from malignancies worldwide in 2018. Renal cell carcinoma is a malignant tumor characterized by the loss of the VHL gene, which leads to increased angiogenesis. The potential of immuno-oncology and anti-angiogenic drugs has significantly improved outcomes for patients with metastatic renal cell carcinoma. The phase III CheckMate 9ER study compared the efficacy and safety of nivolumab plus cabozantinib versus sunitinib in the first-line treatment of patients with metastatic clear cell renal cell carcinoma. The advantages of nivolumab plus cabozantinib over sunitinib in terms of progression-free survival, overall survival, and objective response rate were generally similar across subgroups based on IMDC risk, PD-L1 expression, and the presence or absence of bone metastases. We present a case report of metastatic renal cell carcinoma. The patient has been on cabozantinib plus nivolumab therapy for 12 months, with a partial response achieved. Treatment was well tolerated; the profile of adverse events was consistent with that in the clinical study.По данным GLOBOCAN, в 2018 году зарегистрировано около 18 миллионов новых случаев рака и 9,6 миллионов смертей от злокачественных новообразований во всем мире. Почечно-клеточный рак представляет собой опухоль, характеризующуюяся потерей гена VHL, и эта потеря приводит к усилению ангиогенеза. Возможности применения иммуноонкологических и антиангиогенных препаратов значительно улучшили результаты лечения пациентов с метастатическим почечно-клеточный раком. Исследование III фазы CheckMate 9ER посвящено сравнению эффективности и безопасности комбинации ниволумаба с кабозантинибом и сунитиниба в терапии первой линии пациентов со светлоклеточным метастатическим почечно-клеточным раком. Преимущества комбинации ниволумаба и кабозантиниба в сравнении с сунитинибом в отношении отсутствия прогрессирования, общей выживаемости и частоты объективных ответов в целом были одинаковыми в подгруппах, включая группу риска по IMDC, экспрессию опухолевого PD-L1 и наличие или отсутствие метастатического поражения костной ткани. Приведено клиническое наблюдение лечения пациента с метастатическим почечно-клеточным раком. В настоящее время пациенту на протяжении 12 месяцев продолжается терапия кабозантинибом и ниволумабом, сохраняется частичный ответ. Переносимость терапии удовлетворительная, спектр нежелательных явлений соответствует таковому в клиническом исследовании