نتایج جستجو برای: فولادapi grb
تعداد نتایج: 4533 فیلتر نتایج به سال:
If a gamma ray burst with strong UV emission occurs in a molecular cloud, there will be observable consequences resulting from excitation of the surrounding H 2. The UV pulse from the GRB will pump H 2 into vibrationally-excited levels which produce strong absorption at wavelengths λ 1650Å. As a result, both the prompt flash and later afterglow will exhibit strong absorption shortward of 1650Å,...
The granzyme B-induced cell death has been traditionally viewed as a primary mechanism that is used by cytotoxic T lymphocytes (CTLs) and natural killer (NK) cells to eliminate harmful target cells including allogeneic, virally infected and tumour cells. Granzyme B (GrB) is the most abundant serine protease which is stored in secretory granules of CTLs and NK cells. After recognition of the tar...
We report that the serine protease granzyme B (GrB), which is crucial for granule-mediated cell killing, initiates apoptosis in target cells by first maturing caspase-10. In addition, GrB has a limited capacity to mature other caspases and to cause cell death independently of the caspases. Compared with other members, GrB in vitro most efficiently processes caspase-7 and -10. In a human cell mo...
Over half a century from the discovery of gamma-ray bursts (GRBs), dominant radiation mechanism responsible for their bright and highly variable prompt emission remains poorly understood. Spectral information alone has proven insufficient understanding composition main energy dissipation in GRB jets. High-sensitivity polarimetric observations upcoming instruments this decade may help answer suc...
Following antigenic stimulation and differentiation, Th1 and Th2 effector cells contribute differently to cellular and humoral immunity. Vasoactive intestinal peptide (VIP) induces Th2 responses by promoting Th2 differentiation and survival. In this study, we investigate the mechanisms for the protective effect of VIP against activation-induced cell death (AICD) of Th2 effectors. Surprisingly, ...
Gamma-ray bursts are traditionally classified as short and long based on their $T_{\rm 90}$ value (the time interval during which an instrument observes $5\%$ to $95\%$ of gamma-ray/hard X-ray fluence). However, is dependent the detector sensitivity energy range in operates. As a result, different instruments provide values for burst. GRB 210217A detected with duration by {\it Swift} Fermi}. It...
This work is part of a systematic re-analysis program of all the data of GammaRay Burst (GRB) X-ray afterglows observed so far, in order to constrain the GRB models. We present here a systematic analysis of those afterglows observed by XMMNewton between January 2000 and March 2004. This dataset includes GRB 011211 and GRB 030329. We have obtained spectra, light curves and colors for these after...
We are constructing a 0.6 meter telescope system to search for early time gamma-ray burst(GRB) optical counterparts. Super-LOTIS (SuperLivermore Optical Transient Imaging System) is an automated telescope system that has a 0.8 x 0.8 field-of-view, is sensitive to Mv ∼ 19 and responds to a burst trigger within 5 min. This telescope will record images of the gamma-ray burst coordinates that is gi...
Excess reddened optical emission has been measured in the power-law decay afterglow light curves of several GRBs some tens of days after the GRB events. This emission is claimed to be a signature of a supernova (SN) taking place at the same time as the GRB event, in support of the collapsar scenario. Observations of features in prompt and afterglow X-ray spectra of GRBs require high density, hi...
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