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Search Results: 1 - 10 of 1345 matches for " Charlotte Videbaek "
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Results from pp at 62.4 GeV and 200 GeV with the BRAHMS experiment
F. Videbaek
Physics , 2008,
Abstract: Measurements of elementary pp collisions are an integral component to understand heavy ion collisions. Results for pp collisions at 200 and 62.4 GeV are presented. At both energies NLO pQCD describes pion production well. The measured pion transverse single spin asymmetries are very large at 62.4 GeV and are reasonably well described by models relying on pQCD at transverse momenta larger than 1 GeV/c.
Stopping and Baryon Transport in Heavy Ion Reactions
F. Videbaek
Physics , 2005, DOI: 10.1088/1742-6596/50/1/016
Abstract: In this report I will give an experimental overview on nuclear stopping in hadron collisions, and relate observations to understanding of baryon transport. Baryon number transport is not only evidenced via net-proton distributions but also by the enhancement of strange baryons near mid-rapidity. Although the focus is on high-energy data obtained from pp and heavy ions from RHIC, relevant data from SPS and ISR will be considered. A discussion how the available data at higher energy relates and gives information on baryon junction, quark-diquark breaking will be made.
Stopping in Relativistic Heavy Ion Reactions - From SIS to RHIC
F. Videbaek
Physics , 2001, DOI: 10.1556/APH.15.2002.3-4.13
Abstract: The status of stopping in heavy ion reactions is reviewed by comparing available data in pp, pA and AA systems over the energy regime sqrt(s_NN) ~ 2.5 - 130 GeV/c. The data consist of average rapidity losses, anti-proton over proton ratios, and net-baryon values at mid-rapidity. The overall features of nuclear stopping are reasonbly well described by simple extrapolations of pp, and pA collisions to AA
Increased susceptibility to cardiovascular effects of dihydrocapcaicin in resuscitated rats. Cardiovascular effects of dihydrocapsaicin
Keld Fosgerau, Giuseppe Ristagno, Magdalena Jayatissa, Mads Axelsen, Jacob W Gotfredsen, Uno J Weber, Lars K?ber, Christian Torp-Pedersen, Charlotte Videbaek
BMC Cardiovascular Disorders , 2010, DOI: 10.1186/1471-2261-10-39
Abstract: Here we tested the hypothesis that the cardiovascular system in healthy rats and rats resuscitated from a cardiac arrest may be differentially affected by a transient receptor potential vanilloid type 1 agonist, by continuous intravenous infusion of dihydrocapsaicin (DHC).Compared to baseline, infusion of DHC caused an initial increase in mean arterial blood pressure in both healthy and resuscitated rats of 25% and 10%, respectively. Also, we observed an initial response of tachycardia in both healthy and resuscitated rats of 30% and 20%, respectively. Then, at high levels of DHC infusion (> 2.0 mg/kg/hr) we observed two single episodes of transient bradycardia and hypotension in 33% of the healthy rats, which was consistent with a TRPV1 agonist induced Bezold-Jarisch reflex. In contrast, in resuscitated rats we observed multiple episodes of bradycardia/hypotension in 100% of the rats and at a dose of DHC of 0.65 mg/kg/hr. Notably, this DHC effect could be completely blocked in the resuscitated rats by pre-treatment with atropine, a muscarinic acetylcholine antagonist.Our results indicate that the susceptibility of the rats towards TRPV1 agonist induced Bezold-Jarisch reflex is increased in those resuscitated from cardiac arrest compared to the healthy situation.The transient receptor potential vanilloid type 1 (TRPV1) is a member of the mammalian transient receptor potential family of ion channels [1] and was cloned in 1997 [2]. TRPV1 is a non-selective cation channel with a preference for calcium, which can be directly activated by noxious heat (> 43°C), extracellular acidification, as well as a large heterogeneous group of natural compounds such as dihydrocapsaicin (DHC) from chili pepper [3,4]. The TRPV1 receptor is widely expressed in the human body [5,6] particularly in "port-of-entry" tissues, the central nervous system (CNS), and in the peripheral nervous system in primary small to medium diameter sensory neurons such as dorsal root, trigeminal, and nodose g
Overview and Recent Results from BRAHMS
F. Videbaek,for the BRAHMS Collaboration
Physics , 2009, DOI: 10.1016/j.nuclphysa.2009.09.011
Abstract: The BRAHMS experiment was designed to measure and characterize in particular the properties of rapidity dependence of particle production in heavy ion collisions. The data-taking is now over, results of several years of analysis have been published and demonstrates several important features of the rapidity dependence, not envisioned from the start of the RHIC program. The bulk properties of the system formed at high rapidity resemble that of systems at lower energies at mid-rapidity when referenced via the baryo-chemical potential. New physics in AA are essentially observed at mid-rapidity including the demonstration that high-\pT suppression is a final state effect. Another key result is that in d+A collisions at forward rapidities where the very low-x region of the nucleus was probed, a strong suppression of pion production was observed consistent with the picture of gluon saturation. The latest results examines the centrality and rapidity dependence of nuclear stopping, the particle production of pions, collective expansion vs. rapidity, and the baryon enhancement at intermediate values of \pT .
Rapidity Dependence of High-pt Suppresion
F. Videbaek,for the BRAHMS collaboration
Physics , 2005, DOI: 10.1063/1.2122037
Abstract: The rapidity dependence of the nuclear modification factor in d-Au collaisions at sqrt(s) = 200 GeV at RHIC is discussed.
Single Spin Asymmetries in the BRAHMS Experiment
F. Videbaek,for the BRAHMS collaboration
Physics , 2005, DOI: 10.1063/1.2122205
Abstract: The BRAHMS experiment at RHIC has the capability to measure the transverse spin asymmetries in polarized pp induced pion production at RHIC. The first results from the short run-4 show a signaificant asymmetry for pi-plus and pi-minus at moderate xF. The trend of the data is in agreement with lower energy data while the absolute value are surprisingly large.
Single Spin Asymmetries in the BRAHMS Experiment
F. Videbaek,for the BRAHMS collaboration
Physics , 2006,
Abstract: The BRAHMS experiment at RHIC has measured the transverse single spin asymmetries in polarized pp induced pion production at RHIC. The results from the RHIC run-5 shows a significant asymmetry for pi+ and pi- at moderate xF. The trend of the data is in agreement with lower energy results while the absolute values are surprisingly large. The pT dependence is approximately inversely propotional to pT in agreement with the pQCD expectations.
Drug-induced mild therapeutic hypothermia obtained by administration of a transient receptor potential vanilloid type 1 agonist
Keld Fosgerau, Uno J Weber, Jacob W Gotfredsen, Magdalena Jayatissa, Carsten Buus, Niels B Kristensen, Mogens Vestergaard, Peter Teschendorf, Andreas Schneider, Philip Hansen, Jakob Rauns?, Lars K?ber, Christian Torp-Pedersen, Charlotte Videbaek
BMC Cardiovascular Disorders , 2010, DOI: 10.1186/1471-2261-10-51
Abstract: First, we screened a heterogeneous group of TRPV1 agonists and secondly we tested the hypothermic properties of a selected candidate by dose-response studies. Finally we tested the hypothermic properties in a large animal. The screening was in conscious rats, the dose-response experiments in conscious rats and in cynomologus monkeys, and the finally we tested the hypothermic properties in conscious young cattle (calves with a body weight as an adult human). The investigated TRPV1 agonists were administered by continuous intravenous infusion.Screening: Dihydrocapsaicin (DHC), a component of chili pepper, displayed a desirable hypothermic profile with regards to the duration, depth and control in conscious rats. Dose-response experiments: In both rats and cynomologus monkeys DHC caused a dose-dependent and immediate decrease in body temperature. Thus in rats, infusion of DHC at doses of 0.125, 0.25, 0.50, and 0.75 mg/kg/h caused a maximal ΔT (°C) as compared to vehicle control of -0.9, -1.5, -2.0, and -4.2 within approximately 1 hour until the 6 hour infusion was stopped. Finally, in calves the intravenous infusion of DHC was able to maintain mild hypothermia with ΔT > -3°C for more than 12 hours.Our data support the hypothesis that infusion of dihydrocapsaicin is a candidate for testing as a primary or adjunct method of inducing and maintaining therapeutic hypothermia.Mild therapeutic hypothermia (target temperature between 32°C and 34°C) has emerged as an effective treatment to improve neurological outcomes among cardiac arrest survivors. Following publication of two pivotal randomized clinical trials [1-3] mild therapeutic hypothermia for 12 to 24 hours following cardiopulmonary resuscitation (CPR) of out of hospital cardiac arrest patients with shockable electrocardiography rhythms is recommended by the European Resuscitation Counsel (ERC) and the American Heart Association (AHA) for prevention of neurological injury. Also, mild therapeutic hypothermia has been su
Cross-sections and Single Spin Asymmetries of Identified Hadrons in $p^\uparrow+p$ at $\sqrt{s}$ = 200 GeV
J. H. Lee,F. Videbaek,for the BRAHMS Collaboration
Physics , 2009,
Abstract: Measurements of cross-sections and transverse single spin asymmetries of identified charged hadrons at forward rapidities from transversely polarized proton collisions at $\sqrt{s}$ = 200 GeV are presented. The results are discussed in the context of interplay between perturbative and non-perturbative QCD effects.
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