نتایج جستجو برای: beta ray

تعداد نتایج: 486509  

1995
Chengxing Zhai

The electron neutrino mass has been measured in several tritium beta decay experiments. These experiments are sensitive to a small neutrino mass because the energy release of the decay is small. But the very smallness of the energy release implies that the Coulomb interactions of the slowly moving emitted beta electron are relatively large. Using field theoretic techniques, we derive a systemat...

Journal: :The Journal of Experimental Medicine 1994
E Matsuura Y Igarashi T Yasuda D A Triplett T Koike

Anticardiolipin antibodies (aCL) derived from the sera of individuals exhibiting the antiphospholipid syndrome (APS) directly bind to beta 2-glycoprotein I (beta 2-GPI), which is adsorbed to an oxidized polystyrene surface. Oxygen atoms were introduced on a polystyrene surface by irradiation with electron or gamma-ray radiation. X-ray photoelectron spectroscopy revealed the irradiated surfaces ...

Journal: :Physical Review C 2021

The well-known spherical-deformed-transitional nucleus and potential $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}\phantom{\rule{4pt}{0ex}}$emitter $^{150}\mathrm{Nd}\phantom{\rule{4pt}{0ex}}$and its daughter $^{150}\mathrm{Sm}\phantom{\rule{4pt}{0ex}}$were investigated in nuclear resonance fluorescence experiments using quasimonoenergetic, linearly polarized $\ensuremath{\gamma}$-ray ...

1999
Martin E. Sulkanen

Imaging of the Sunyaev-Zel’dovich (SZ) effect in galaxy clusters combined with cluster plasma x-ray diagnostics can measure the cosmic distance scale to high redshift. However, projecting the inverseCompton scattering and x-ray emission along the cluster line-of-sight introduces systematic errors in the Hubble constant, H0, because the true shape of the cluster is not known. In this paper I pre...

Journal: :Monthly Notices of the Royal Astronomical Society 2022

Binary neutron star mergers are expected to produce fast dynamical ejecta, with mildly relativistic velocities extending $\beta=v/c>0.6$. We consider the radio X-ray synchrotron emission produced by collisionless shocks driven such ejecta into interstellar medium. Analytic expressions given for spherical broken power-law mass (or energy) distributions, $M(>\gamma\beta)\propto(\gamma\beta)^{-s}$...

Journal: :Journal of the American Chemical Society 2005
Donatella Tondi Federica Morandi Richard Bonnet M Paola Costi Brian K Shoichet

Bacterial expression of beta-lactamases is the most widespread resistance mechanism to beta-lactam antibiotics, such as penicillins and cephalosporins. There is a pressing need for novel, non-beta-lactam inhibitors of these enzymes. One previously discovered novel inhibitor of the beta-lactamase AmpC, compound 1, has several favorable properties: it is chemically dissimilar to beta-lactams and ...

Journal: :Physical review letters 2003
A C Dürr F Schreiber K A Ritley V Kruppa J Krug H Dosch B Struth

The scaling exponents alpha, beta, and 1/z in thin films of the organic molecule diindenoperylene deposited on SiO2 under UHV conditions are determined. Atomic-force microscopy, x-ray reflectivity, and diffuse x-ray scattering were employed. The surface width displays power law scaling over more than 2 orders of magnitude in film thickness. We obtained alpha = 0.684+/-0.06, beta = 0.748+/-0.05,...

2010
E. Andreotti O. Cremonesi S. Di Domizio L. Ejzak R. Faccini S. Morganti M. Vignati

a r t i c l e i n f o a b s t r a c t Keywords: CUORICINO Muons Cosmic rays Double beta decay Neutrinos To better understand the contribution of cosmic ray muons to the CUORICINO background, 10 plastic scintillator detectors were installed at the CUORICINO site and operated during the final 3 months of the experiment. From these measurements, an upper limit of 0.0021 counts/(keV kg yr) (95% CL)...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1987
D A Kirschner H Inouye L K Duffy A Sinclair M Lind D J Selkoe

Progressive amyloid deposition in senile plaques and cortical blood vessels may play a central role in the pathogenesis of Alzheimer disease. We have used x-ray diffraction and electron microscopy to study the molecular organization and morphology of macromolecular assemblies formed by three synthetic peptides homologous to beta protein of brain amyloid: beta-(1-28), residues 1-28 of the beta p...

Journal: :Biochemical and biophysical research communications 2002
Kuo-Chen Chou W Jeffrey Howe

beta-Secretase, also known as BACE, is a transmembrane aspartyl protease, which generates the N terminus of Alzheimer's disease amyloid beta-peptide. The activity of beta-secretase is the rate-limiting step of brain plaques production in vivo, and hence is a potential target for disease modifying drugs for Alzheimer's disease. To better understand the mechanism of action of beta-secretase and h...

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