The present study assessed the role of the p53 tumor suppressor gene in cell cycle arrest and apoptosis following treatment of Burkitt's lymphoma and lymphoblastoid cell lines with gamma-rays, etoposide, nitrogen mustard, and cisplatin. Cell cycle arrest was measured by flow cytometry; p53 and p21Waf1/Cip1 protein levels were measured by Western blotting; cell survival was measured in 72-96-h g...

Background: High density concrete is extensively used for efficient radiation attenuation in radiotherapy rooms and nuclear reactors. Over the past eight years, some efficient galena-based concrete samples for shielding X or gamma rays was produced. The goal of this study was to produce a novel high density concrete against neutron and photon radiations using tourmaline and galena. Materials an...

This paper presents an interpretation based on gamma-ray burst source kinematics for the relationship found by Norris et al. between peak luminosity and energy-dependent pulse lag. I argue that the correlation should instead be between number luminosity and pulse lag. This interpretation improves the least-squares fit of this correlation for the known bursts by 25 percent or more. It also sugge...

A comparison of the effectiveness and efficiency of gamma rays and ethyl methanesulfonate (EMS) for inducing mutation in chilli seeds of 10 different doses along with one respective control. Seeds were treated with 10, 20, 30, 40 and 50 kR of gamma rays and 10, 20, 30, 40 and 50 mM of ethyl methanesulfonate. The M1 generation was produced from these mutagen treated seeds. Several unique and int...

The beaming pattern of thermal annihilation radiation is broader than the beaming pattern produced by isotropic nonthermal electrons and positrons in the jets of radio-emitting active galactic nuclei which Compton scatter photons from an external isotropic radiation field. Thus blueshifted thermal annihilation radiation can provide the dominant contribution to the high-energy radiation spectrum...

The light curves of Type Ia Supernovae (SN Ia) are powered by gamma-rays emitted by the decay of radioactive elements such as 56 Ni and its decay products. These gamma-rays are downscattered, absorbed, and eventually reprocessed into the optical emission which makes up the bulk of all supernova observations. Detection of the gamma-rays that escape the expanding star provide the only direct mean...

We present recipes to diagnose the fireball of gamma-ray bursts (GRBs) by combining observations of e pair-signatures (the pair-annihilation line and the cutoff energy due to the pair-creation process). Our recipes are largely model-independent and extract information even from the non-detection of either pair-signature. We evaluate physical quantities such as the Lorentz factor, optical depth ...

This study was conducted to determine changes for some quality characters in M2, M3 and M4 mutated populations of three bread wheat genotypes irradiated by different gamma rays. The results showed that the significantly variably differed their response various traits at rays doses M3, populations. shifts per see from controls examined such as thousand-grain weight (TGW), test (TW), wet gluten c...