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Inclusive V0V^0 Production Cross Sections from 920 GeV Fixed Target Proton-Nucleus Collisions

Inclusive differential cross sections $d\sigma_{pA}/dx_F$ and $d\sigma_{pA}/dp_t^2$ for the production of \kzeros, \lambdazero, and \antilambda particles are measured at HERA in proton-induced reactions on C, Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to $\sqrt {s} = 41.6$ GeV in the proton-nucleon system. The ratios of differential cross sections \rklpa and \rllpa are measured to be $6.2\pm 0.5$ and $0.66\pm 0.07$, respectively, for \xf $\approx-0.06$. No significant dependence upon the target material is observed. Within errors, the slopes of the transverse momentum distributions $d\sigma_{pA}/dp_t^2$ also show no significant dependence upon the target material. The dependence of the extrapolated total cross sections $\sigma_{pA}$ on the atomic mass $A$ of the target material is discussed, and the deduced cross sections per nucleon $\sigma_{pN}$ are compared with results obtained at other energies.Comment: 17 pages, 7 figures, 5 table

The QCD transition temperature: results with physical masses in the continuum limit II.

We extend our previous study [Phys. Lett. B643 (2006) 46] of the cross-over temperatures (T_c) of QCD. We improve our zero temperature analysis by using physical quark masses and finer lattices. In addition to the kaon decay constant used for scale setting we determine four quantities (masses of the \Omega baryon, K^*(892) and \phi(1020) mesons and the pion decay constant) which are found to agree with experiment. This implies that --independently of which of these quantities is used to set the overall scale-- the same results are obtained within a few percent. At finite temperature we use finer lattices down to a <= 0.1 fm (N_t=12 and N_t=16 at one point). Our new results confirm completely our previous findings. We compare the results with those of the 'hotQCD' collaboration.Comment: 19 pages, 8 figures, 3 table

EXPLORING A ROLE FOR CHROMATIN-REMODELING ENZYMES IN OXIDATIVE STRESS AND CARDIOVASCULAR DISEASE

Binder K, Nessen E, Ollmann C, Sexauer A, Crosswhite P. Gonzaga University, Spokane, WA. Cardiovascular disease (CVD) is the leading cause of death in the United States and oxidative stress is one contributing factor to dysfunction of the cardiovascular system. Chromatin remodeling complexes (CRCs) are enzymes that aid the regulation of DNA-histone binding to alter gene expression. Two CRCs, brahma (BRM) and brahma-related gene 1 (BRG1), are known to increase oxidative stress in cancer models but their role in the adult vasculature is poorly understood. PURPOSE: To measure the expression of oxidative stress markers after knockdown of BRG1/BRM in human vascular smooth muscle cells (SMCs). METHODS: Adult human SMCs were cultured and BRG1 and BRM were knocked down via an interfering RNA approach. Total RNA was isolated and quantitative polymerase chain reaction was used to measure the expression of several oxidative stress-related genes. RESULTS: Analysis of gene expression of oxidative stress-related markers including cellular-myleocytomatosis (c-MYC), superoxide dismutase (SOD), NADPH oxidase 4 (NOX4) and human SHC‐transforming protein 1 (SHC1) are ongoing and will be discussed. Based on literature, we expect that the levels of c-MYC and SOD will increase, while NOX4 and SCH1 will decrease. CONCLUSION: Our attempts to establish preliminary evidence linking CRC regulation of oxidative stress in adult human SMCs. This would be the first report of CRC-mediated oxidative stress in the adult vasculature and may open novel research opportunities for studying oxidative stress and CVD

Fast Time Resolution Oxidized Mercury Measurements during the Reno Atmospheric Mercury Intercomparison Experiment (RAMIX)

The Reno Atmospheric Mercury Intercomparison Experiment (RAMIX) was carried out from 22 August to 16 September, 2011 in Reno, NV to evaluate the performance of new and existing methods to measure atmospheric mercury (Hg). Measurements were made using a common sampling manifold to which controlled concentrations of Hg species, including gaseous elemental mercury (GEM) and HgBr2 (a surrogate gaseous oxidized mercury (GOM) compound), and potential interferents were added. We present an analysis of Hg measurements made using the University of Washington’s Detector for Oxidized Hg Species (DOHGS), focusing on tests of GEM and HgBr2 spike recovery, the potential for interference from ozone (O3) and water vapor (WV), and temporal variability of ambient reactive mercury (RM). The mean GEM and HgBr2 spike recoveries measured with the DOHGS were 95% and 66%, respectively. The DOHGS responded linearly to HgBr2. We found no evidence that elevated O3 interfered in the DOHGS RM measurements. A reduction in RM collection and retention efficiencies at very high ambient WV mixing ratios is possible. Comparisons between the DOHGS and participating Hg instruments demonstrate good agreement for GEM and large discrepancies for RM. The results suggest that existing GOM measurements are biased low