3,052 research outputs found
Strange Hadrons from the ALCOR Rehadronization Model
Hadron multiplicities --- especially for strange particles --- are calculated
in the framework of the algebraic coalescence rehadronization model (ALCOR),
which counts for redistribution of quarks into hadrons for relativistic
heavy-ion collisions. The influence of Bjorken flow on the final hadronic
composition are incorporated in the model. A comparison is made with the CERN
SPS NA35 and experiments. The analysis of these experiments with
ALCOR shows a strangeness enhancement for S+S collisions and a possible
formation of a sort of semi-deconfined state of the matter. Predictions for
Pb+Pb collisions (NA49) are also presented.Comment: 14 pages, LaTeX, Review to appear in Proceedings of Strangeness'95,
Tucson, Arizona, Jan. 4--6 1995. (American Institute of Physics
Faces of quark matter
Based on an analysis in the framework of a coalescence hadronization model
(ALCOR) we conclude that in heavy ion collisions at CERN SPS and RHIC energies
a new type of matter, the massive quark-antiquark matter is produced.Comment: Talk given at Budapest Workshop on Quark and Hadron Dynamics in
Relativistic Heavy Ion Collisions (BP 2002) Budapest, Hungary, 3-7 Mar 2002.
12 pages in Latex, 8 PS figure. Submitted to Heavy Ion Physics. Note added in
proo
Non-Abelian Bremsstrahlung and Azimuthal Asymmetries in High Energy p+A Reactions
We apply the GLV reaction operator solution to the Vitev-Gunion-Bertsch (VGB)
boundary conditions to compute the all-order in nuclear opacity non-abelian
gluon bremsstrahlung of event-by-event fluctuating beam jets in nuclear
collisions. We evaluate analytically azimuthal Fourier moments of single gluon,
, and even number gluon, inclusive
distributions in high energy p+A reactions as a function of harmonic ,
%independent target recoil cluster number, , and gluon number, , at
RHIC and LHC. Multiple resolved clusters of recoiling target beam jets together
with the projectile beam jet form Color Scintillation Antenna (CSA) arrays that
lead to characteristic boost non-invariant trapezoidal rapidity distributions
in asymmetric nuclear collisions. The scaling of intrinsically
azimuthally anisotropic and long range in nature of the non-abelian \br
leads to moments that are similar to results from hydrodynamic models,
but due entirely to non-abelian wave interference phenomena sourced by the
fluctuating CSA. Our analytic non-flow solutions are similar to recent
numerical saturation model predictions but differ by predicting a simple
power-law hierarchy of both even and odd without invoking
factorization. A test of CSA mechanism is the predicted nearly linear
rapidity dependence of the . Non-abelian beam jet \br may thus
provide a simple analytic solution to Beam Energy Scan (BES) puzzle of the near
independence of moments observed down to 10 AGeV where
large valence quark beam jets dominate inelastic dynamics. Recoil \br from
multiple independent CSA clusters could also provide a partial explanation for
the unexpected similarity of in and non-central at same
multiplicity as observed at RHIC and LHC.Comment: 16 pages, 10 figure
New Entropy Formula with Fluctuating Reservoir
Finite heat reservoir capacity and temperature fluctuations lead to
modification of the well known canonical exponential weight factor. Requiring
that the corrections least depend on the one-particle energy, we derive a
deformed entropy, K(S). The resulting formula contains the Boltzmann-Gibbs, the
Renyi and the Tsallis formulas as particular cases. For extreme large
fluctuations (compared to the Gaussian case) a new, parameter-free entropy -
probability relation emerges. This formula and the corresponding canonical
equilibrium distribution are nearly Boltzmannian for high probability, but
deviate from the classical result for low probability. In the extreme large
fluctuation limit the canonical distribution resembles for low probability the
cumulative Gompertz distribution
Pion and Kaon Spectra from Distributed Mass Quark Matter
After discussing some hints for possible masses of quasiparticles in quark
matter on the basis of lattice equation of state, we present pion and kaon
transverse spectra obtained by recombining quarks with distributed mass and
thermal cut power-law momenta as well as fragmenting by NLO pQCD with intrinsic
{and nuclear} broadening.Comment: Talk given at SQM 200
Structure-Function of U11 snRNA in the Minor Splicing Pathway
In human, the majority of protein coding genes are interrupted by dispensable intervening sequences (introns). These introns are removed by nuclear precursor (pre) mRNA splicing process to produce a mature mRNA needed for productive protein production in the cell. We are studying the splicing of minor class or U12-type introns which are spliced by U11, U12, U4atac, U5 and U6atac snRNAs. U11 snRNA binds to the 5’ end or splice site of the intron by RNA-RNA base-pairing to initiate the splicing process. Our results show the functionality of the genetic mutation suppressor assay in establishing the role of U11 snRNA in nuclear pre-mRNA splicing.https://engagedscholarship.csuohio.edu/u_poster_2012/1041/thumbnail.jp
High-frequency jet ventilation for minimizing breathing-related liver motion during percutaneous radiofrequency ablation of multiple hepatic tumours
Movements of the liver caused by spontaneous breathing (during sedation or local anaesthesia) or by ventilation during anaesthesia are a source of concern in CT-guided procedures because of the limited spatial and contrast resolution of unenhanced imaging, artifacts caused by the probes and the relatively low temporal resolution of the fluoroscopy mode. During CT-guided radiofrequency ablation (RFA), it is essential that the lesion can be visualized optimally and that the ablation probe is positioned accurately to avoid non-target injuries. We therefore used high-frequency jet ventilation and general anaesthesia to minimize ventilation-related liver movement and provide optimal conditions for a patient undergoing RFA of hepatic metastases. The technical and anaesthetic considerations are discussed, and a specific limitation of transcutaneous Pco2 measurement during activation of the ablation is reported for the first tim
Correlation between nucleotide composition and folding energy of coding sequences with special attention to wobble bases
Background: The secondary structure and complexity of mRNA influences its
accessibility to regulatory molecules (proteins, micro-RNAs), its stability and
its level of expression. The mobile elements of the RNA sequence, the wobble
bases, are expected to regulate the formation of structures encompassing coding
sequences.
Results: The sequence/folding energy (FE) relationship was studied by
statistical, bioinformatic methods in 90 CDS containing 26,370 codons. I found
that the FE (dG) associated with coding sequences is significant and negative
(407 kcal/1000 bases, mean +/- S.E.M.) indicating that these sequences are able
to form structures. However, the FE has only a small free component, less than
10% of the total. The contribution of the 1st and 3rd codon bases to the FE is
larger than the contribution of the 2nd (central) bases. It is possible to
achieve a ~ 4-fold change in FE by altering the wobble bases in synonymous
codons. The sequence/FE relationship can be described with a simple algorithm,
and the total FE can be predicted solely from the sequence composition of the
nucleic acid. The contributions of different synonymous codons to the FE are
additive and one codon cannot replace another. The accumulated contributions of
synonymous codons of an amino acid to the total folding energy of an mRNA is
strongly correlated to the relative amount of that amino acid in the translated
protein.
Conclusion: Synonymous codons are not interchangable with regard to their
role in determining the mRNA FE and the relative amounts of amino acids in the
translated protein, even if they are indistinguishable in respect of amino acid
coding.Comment: 14 pages including 6 figures and 1 tabl
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