236 research outputs found
Recommended from our members
Expression of human adenosine deaminase in nonhuman primates after retrovirus-mediated gene transfer.
Primate bone marrow cells were infected with a retroviral vector carrying the genes for human adenosine deaminase (h-ADA) and bacterial neomycin resistance (neor). The infected cells were infused back into the lethally irradiated donor animals. Several monkeys fully reconstituted and were shown to express the h-ADA and neor genes at low levels in their recirculating hematopoietic cells for short periods of time
Recommended from our members
High Energy Physics
This proposal is for the continuation of the High Energy Physics Program at the University of California, Riverside. In 1990, we will concentrate on analysis of LEP data from the OPAL detector. We expect to record 10{sup 5} Z`s by the end of 1989 and 10{sup 6} in 1990. This data will be used to measure the number of quark-lepton families in the universe. In the second half of 1990 we will also be occupied with the installation of the D-Zero detector in the Tevatron Collider and the preparation of software for the 1991 run. A new initiative made possible by generous university support is a laboratory for detector development at UCR. The focus will be on silicon strip tracking detectors both for the D-Zero upgrade and for SSC physics. The theory program will pursue further various mass-generating radiative mechanisms for understanding small quark and lepton masses as well as some novel phenomenological aspects of supersymmetry
Recommended from our members
High Energy Physics
Hadron collider studies will focus on: (i) the search for the top quark with the newly installed D0 detector at the Fermilab Tevatron collider, (ii) the upgrade of the D0 detector to match the new main injector luminosity and (iii) R&D on silicon microstrip tracking devices for the SSC. High statistics studies of Z{sup 0} decay will continue with the OPAL detector at LEP. These studies will include a direct measurement of Z decay to neutrinos, the search for Higgs and heavy quark decays of Z. Preparations for the Large Scintillation Neutrino Detector (LSND) to measure neutrino oscillations at LAMPF will focus on data acquisition and testing of photomultiplier tubes. In the theoretical area E. Ma will concentrate on mass-generating radiative mechanisms for light quarks and leptons in renormalizable gauge field theories. J. Wudka`s program includes a detailed investigation of the magnetic-flip approach to the solar neutrino
Distortion of the acoustic peaks in the CMBR due to a primordial magnetic field
In this paper we study the effect of a magnetic field on the fluctuation
spectrum of the cosmic microwave background. We find that upcoming measurements
might give interesting bounds on large scale magnetic fields in the early
Universe. If the effects are seen, it might be possible to establish the
presence of different fields in different patches of the sky. Absence of any
effect, will provide by one order of magnitude a better limit for a primordial
field, now given by nucleosynthesis.Comment: 10 pages, 2 .ps figures included, extra reference added and
typographical errors correcte
Active-active and active-sterile neutrino oscillation solutions to the atmospheric neutrino anomaly
We perform a fit to the full data set corresponding to 33.3 kt-yr of data of
the Super-Kamiokande experiment as well as to all other experiments in order to
compare the two most likely solutions to the atmospheric neutrino anomaly in
terms of oscillations in the and
channels. Using state-of-the-art atmospheric neutrino fluxes we have determined
the allowed regions of oscillation parameters for both channels. We find that
the values for the active-sterile oscillations (both for positive
and negative ) are higher than for the case,
and that the increased Super-Kamiokande sample slightly favours oscillations over oscillations into a sterile species ,
, and disfavours . We also give the
zenith angle distributions predicted for the best fit points in each of the
possible oscillation channels. Finally we compare our determinations of the
atmospheric neutrino oscillation parameters with the expected sensitivities of
future long-baseline experiments K2K, MINOS, ICARUS, OPERA and NOE.Comment: Updated to 535 days of Super-Kamiokande and corresponding
modifications in the discussion and figures. Some References adde
Limits on Active-Sterile Neutrino Mixing and the Primordial Deuterium Abundance
Studies of limits on active-sterile neutrino mixing derived from big bang
nucleosynthesis considerations are extended to consider the dependance of these
constraints on the primordial deuterium abundance. This study is motivated by
recent measurements of D/H in quasar absorption systems, which at present yield
discordant results. Limits on active-sterile mixing are somewhat relaxed for
high D/H. For low D/H (), no active-sterile neutrino
mixing is allowed by currently popular upper limits on the primordial He
abundance . For such low primordial D/H values, the observational inference
of active-sterile neutrino mixing by upcoming solar neutrino experiments would
imply that has been systematically underestimated, unless there is new
physics not included in standard BBN.Comment: 10 pages + 2 figures, uses revtex macros, submitted to Phys. Rev. D.
Corrected figure captions and an added referenc
Neutrino Decay as an Explanation of Atmospheric Neutrino Observations
We show that the observed zenith angle dependence of the atmospheric
neutrinos can be accounted for by neutrino decay. Furthermore, it is possible
to account for all neutrino anomalies with just three flavors.Comment: 4 pages, 1 figur
Recommended from our members
When is a Publishing Business Truly âGlobalâ? An Analysis of a Routledge Case Study with Reference to Ohmaeâs Theory of Globalization
This study first reviews the writing of the management theorist Kenichi Ohmae, before assessing the potential application of his theory of global commercial maturation to the strategies adopted by the academic publishing company, Routledge, and its precursor imprints between 1960 and 2013. Based on the analysis of interviews carried out between 2011 and 2013 and supporting document analysis, the paper concludes that, with some caveats, the stages of globalization identified by Ohmae are of considerable explanatory value for students and analysts of global publishing as well as offering strategic insights to managers of academic publishing houses
Models of Light Singlet Fermion and Neutrino Phenomenology
We suggest that a singlet fermion exists beyond the standard see-saw
structure. It mixes with light neutrinos via interactions with the right-handed
neutrino components, so that \n_e \to S conversion solves the solar neutrino
problem. Supersymmetry endowed with R-symmetry is shown to give a natural
framework for existence, mass scale and mixing () of such a fermion. Models with an approximate
horizontal symmetry are constructed, which embed the fermion and explain
simultaneously solar, atmospheric, hot dark matter problems as well as may
predict the oscillation \bar{\n}_\m \to \bar{\n}_e in the region of
sensitivity of KARMEN and LSND experiments.Comment: 14 pages, latex, no figure
Light Gravitinos as Mixed Dark Matter
In theories with a gauge-mediated mechanism of supersymmetry breaking the
gravitino is likely to be the lightest superparticle and, hence, a candidate
for dark matter. We show that the decay of the next-to-lightest superparticle
into a gravitino can yield a non-thermal population of gravitinos which behave
as a hot dark matter component. Together with the warm component, which is
provided by the population of gravitinos of thermal origin, they can give rise
to viable schemes of mixed dark matter. This realization has some specific and
testable features both in particle physics and astrophysics. We outline under
which conditions the mechanism remains viable even when R parity is broken.Comment: 18 pages, LaTeX, no figur
- âŠ