47,740 research outputs found
Comparison of Nuclear Suppression Effects on Meson Production at High p_T and p_L
The medium effect on the pion distribution at high in collisions
is compared to that of the pion distribution at high in collisions.
Both the suppression of the spectra and the energy losses of the measured pions
are studied. Although the medium effect on is larger than on , the
difference is found surprisingly to be not as big as one would naively expect.Comment: 8 RevTex pages with 5 figure
European new entry into UK grocery retailing
Until recently, the UK grocery retail market was extremely national in nature, dominated by home-grown incumbents which had developed from regional strongholds (Sainsbury in southern England, Asda in northern England, for example). The lack of any significant presence in the UK market from Europe or the wider world was a remarkable characteristic, particularly when Europe had a number of cross-border grocery retailers. In the final years of the last decade, this changed, when two European grocery retailers, Germany's Aldi and the Danish Netto, entered the UK market. The entry of these retailers, and the possible entry of others like them, raises a number of significant matters relating to the structure, present and future, of the UK grocery retail market. The objective of this article is to explain how these new entrants were able to penetrate the market's barriers to entry, to analyse the events which created the market opportunity targeted, and to describe the response of UK incumbents and the long-run effects on the market which are likely to result
Nucleon participants or quark participants?
We show that centrality dependence of charged particle pseudorapidity density
at midrapidity in Au+Au collisions at RHIC is well described as proportional to
We show that centrality dependence of charged particle pseudorapidity density
at midrapidity in Au+Au collisions at RHIC is well described as proportional to
the number of participating constituent quarks. In this approach there is no
need for an additional contribution from hard processes usually considered in
the models based on the number of the nucleon participants.Comment: 3 pages, 4 figures, latex, version accepted for publication in
Phys.Rev.
Parton Distributions in the Valon Model
The parton distribution functions determined by CTEQ at low are used as
inputs to test the validity of the valon model. The valon distributions in a
nucleon are first found to be nearly independent. The parton distribution
in a valon are shown to be consistent with being universal, independent of the
valon type. The momentum fractions of the partons in the valon add up
separately to one. These properties affirm the validity of the valon model. The
various distributions are parameterized for convenient application of the
model.Comment: 9 pages + 9 figures in ep
The market for insulation in Alaska and feasibility of the regional manufacture of insulating materials
This investigation was undertaken jointly by the Mineral Industry Research Laboratory and the Institute of Business, Economic and Government Research at the University of Alaska. It is one of a continuing series of studies concerning the market and utilization rate for selected structural materials within Alaska. The overall objective of these studies is to identify opportunities for the regional manufacture of
selected building products. In this manner, this limited study of insulation markets complements more extensive previous
studies concerning Alaskan cement and clay products, markets and manufacturing feasibility
Natural resource base of the Fairbanks North Star Borough
This report on the natural resource base of the Fairbanks North Star Borough is one of several continuing research projects related to community planning in Alaska. It represents an interdisciplinary effort of the Mineral Industry Research Laboratory and the Institute of Social, Economic and Government Research at the University of Alaska. The result is a synthesis of the economic development potential of natural resources in the greater Fairbanks region
Phosphorylation of phosphoenolpyruvate carboxykinase in plants. Studies in plants with C4 photosynthesis and Crassulacean acid metabolism and in germinating seeds
We have previously shown that phosphoenolpyruvate carboxykinase (PEPCK) is phosphorylated in vivo in the cotyledons of darkened cucumber seedlings and that phosphorylation is reversed by light [Walker and Leegood (1995) FEBS Lett. 362, 70–74]. In this study the molecular mass of PEPCK was estimated in a range of gluconeogenic seedlings and in leaves of C4 plants and plants with Crassulacean acid metabolism (CAM). Phosphorylation of PEPCK was studied in these plants by feeding tissues with [32P]Pi and assessing phosphorylation by SDS/PAGE and autoradiography of either total proteins or of immunoprecipitated protein. In gluconeogenic seedlings and most CAM plants PEPCK had a molecular mass of 74 kDa, whereas in C4 grasses the molecular mass of PEPCK was always smaller and varied from 67–71 kDa. In all gluconeogenic seedlings and leaves of CAM plants PEPCK was phosphorylated, but it was not phosphorylated in all species of C4 grasses studied. In CAM plants, phosphorylation of PEPCK occurred at night and dephosphorylation occurred during the day. In C4 grasses phosphorylation occurred when leaves were darkened and the enzyme was dephosphorylated following illumination, but it was only phosphorylated in those plants with larger (71 kDa) molecular mass forms of PEPCK
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