70 research outputs found
Leptonic Decays of the W-Boson in a Strong Electromagnetic Field
The probability of W-boson decay into a lepton and a neutrino in a strong
electromagnetic field is calculated. On the basis of the method for deriving
exact solutions to relativistic wave equations for charged particles, an exact
analytic expression is obtained for the partial W-decay width at an arbitrary
value of the external field strength. It is found that, in the region of
comparatively weak fields, field-induced corrections to the standard decay
width of the W-boson in a vacuum are about a few percent. In these conditions
at first we observe the decrease of the W-boson partial decay width with the
increase of the external field strength parameter. At absolute minimum the
W-width deviates from the corresponding vacuum value by a factor 0,926. Then
with further augmentation of the background field intensity the W-boson decay
width grows monotonously. In superstrong fields the partial W-width is greater
than the corresponding one in vacuum in a dozen of times.Comment: LaTex file, 19 pages, 2 Postscript figur
Search for the decay
We performed a search for the decay with the
E391a detector at KEK. In the data accumulated in 2005, no event was observed
in the signal region. Based on the assumption of
proceeding via parity-violation, we obtained the single event sensitivity to be
, and set an upper limit on the branching ratio to
be at the 90% confidence level. This is a factor of 3.2
improvement compared to the previous results. The results of proceeding via parity-conservation were also presented in this paper
Experimental study of the decay
The first dedicated search for the rare neutral-kaon decay
has been carried out in the E391a experiment at the
KEK 12-GeV proton synchrotron. The final upper limit of 2.6 at
the 90% confidence level was set on the branching ratio for the decay.Comment: 23 pages, 27 figures, accepted for publication as a regular article
in Physical Review
EFFECT OF ANTIGEN-PRIMED DENDRITIC CELL-BASED IMMUNOTHERAPY ON ANTITUMOR CELLULAR IMMUNE RESPONSE IN PATIENTS WITH COLORECTAL CANCER
The problem of treatment of oncological diseases is one of the most urgent for modern medicine. Existing treatment approaches are based on a surgical, radiation, chemotherapeutic approach, and the use of immunotherapy methods aimed at markers and / or specific antigens of tumors.Approaches based on the mechanisms of cellular and molecular regulation of a specific antitumor immune response have shown their high efficiency (for example, antibodies against HER2 in breast cancer), but these approaches have a number of side and undesirable effects that limit their application. Considering the central role of the mechanisms of recognition of tumor antigens and their presentation to cytotoxic cells in effective tumor elimination, it is important to search for and develop approaches to restore these mechanisms in cancer pathology. Because maturation, differentiation of dendritic cells and their main function are impaired in oncological diseases, scientific research is underway to obtain mature dendritic cells and restore the natural way of antigen presentation to effector cells.The work carried out limited clinical studies (13 patients with colorectal cancer), a previously developed protocol for obtaining antigen-primed dendritic cells of patients with colorectal cancer and their joint culture with autologous mononuclear cells in vitro. From the peripheral blood of cancer patients, dendritic cells primed with autologous tumor antigens (tumor cell lysate), which were co-cultured with their own mononuclear cells in the presence of immunoregulatory cytokines (IL-12 and IL-18). The resulting cell suspensions were purified from the culture medium and cytokines and used for a course of immunotherapy (weekly, 20-30 million cells intravenously, dropwise), consisting of 3-5 injections. At different periods of immunotherapy (before the start of the course of immunotherapy, 3 months and 6 months after the end of immunotherapy), immunological parameters were assessed in the peripheral blood of patients (immunogram (CD3+, CD3+CD4+, CD3+CD8+, CD19, CD16+CD56+-cells), the relative content of T-regulatory cells (CD4+CD25+FoxP3+-cells), myeloid suppressor cells (CD14+HLA-DR- cells)) and assessed the cytotoxic activity of peripheral blood mononuclear cells of patients against cells of the tumor line of human colorectal cancer (Colo-320).The data obtained showed that in cancer patients, against the background of ongoing immunotherapy, the indicator of the direct cytotoxic test significantly increases, which makes it possible to judge the effective stimulation of the antitumor cellular immune response. This is also indicated by an increase in the relative number of CD16+CD56+-cells (NK-cells) 3 months after immunotherapy. The study of immunosuppressive cells in the blood of cancer patients showed the absence of significant changes in CD14+HLA-DR- -cells and T-regulatory cells.Thus, limited clinical studies of immunotherapy of patients with colorectal cancer based on autologous dendritic cells primed with lysate of autologous tumor cells demonstrated an increase in the antitumor cytotoxic immune response
Long-lived neutral-kaon flux measurement for the KOTO experiment
The KOTO ( at Tokai) experiment aims to observe the CP-violating rare
decay by using a long-lived neutral-kaon
beam produced by the 30 GeV proton beam at the Japan Proton Accelerator
Research Complex. The flux is an essential parameter for the measurement
of the branching fraction. Three neutral decay modes, , , and were used to
measure the flux in the beam line in the 2013 KOTO engineering run. A
Monte Carlo simulation was used to estimate the detector acceptance for these
decays. Agreement was found between the simulation model and the experimental
data, and the remaining systematic uncertainty was estimated at the 1.4\%
level. The flux was measured as per protons on a
66-mm-long Au target.Comment: 27 pages, 16 figures. To be appeared in Progress of Theoretical and
Experimental Physic
АНАЛИЗ ОСНОВНЫХ ПОКАЗАТЕЛЕЙ РАБОТЫ МОСКОВСКОГО ГОРОДСКОГО ОЖОГОВОГО ЦЕНТРА ПОСЛЕ МОДЕРНИЗАЦИИ
The article reports the activity of the Burn Center of the N.V. Sklifosovsky Research Institute for Emergency Medicine. We present comparative data on changes in the structure of patients with a burn injury for the past 20 years, and indicators of clinical outcomes over time.В статье представлен анализ деятельности городского ожогового центра в составе НИИ СП им. Н.В. Склифосовского. Приведены сравнительные данные изменения структуры поступавших пациентов с ожоговой травмой за последние 20 лет с динамикой показателей клинических результатов лечения
АНАЛИЗ ГОСПИТАЛИЗАЦИИ ПОСТРАДАВШИХ ПРИ МАССОВЫХ ПОСТУПЛЕНИЯХ В НИИ СКОРОЙ ПОМОЩИ ИМ. Н.В. СКЛИФОСОВСКОГО
N.V. Sklifosovsky Research Institute for Emergency Medicine is the main clinical base for medical elimination of mass disasters consequences, and about 20% of victims arrive here in emergency situations in Moscow. The current clinical structure of N.V. Sklifosovsky Research Institute for Emergency Medicine provides for the provision of skilled medical care to a large number of patients in massive admissions. Resuscitation departments of various specialties are organized at the Institute. In elimination of medical consequences of mass disasters, 11 clinical departments with 544 beds and 9 resuscitation departments are used. The capacity of resuscitation units (101 beds) allows to admit a large number of severely affected patients simultaneousely, including patients with combined and multisystem trauma, as well as to re-admit after surgery, taking into account the type of injury.ГБУЗ «НИИ скорой помощи им. Н.В. Склифосовского Департамента здравоохранения г. Москвы» является основной клинической базой для медицинской ликвидации последствий массовых катастроф, куда направляются около 20% госпитализируемых пострадавших при чрезвычайных ситуациях в г. Москве. Сложившаяся к настоящему времени клиническая структура НИИ скорой помощи им. Н.В. Склифосовского предусматривает обеспечение квалифицированной медицинской помощью большого числа пациентов при массовых поступлениях. В институте организованы реанимационные отделения различных профилей. При ликвидации медицинских последствий массовых катастроф непосредственно используются 11 клинических отделений с коечным фондом 544 койки и 9 реанимационных отделений. Коечная мощность реанимаций — 101 койка — позволяет осуществлять единовременный прием большого числа тяжелопострадавших, в том числе с комбинированной и сочетанной травмой, а также осуществлять повторные госпитализации после операционных вмешательств с учетом профиля травмы
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