8 research outputs found
Systematic Study of High p_T Hadron Spectra in pp, pA and AA Collisions from SPS to RHIC Energies
High- particle spectra in (), and
collisions are calculated within a QCD parton model in which intrinsic
transverse momentum, its broadening due to initial multiple parton scattering,
and jet quenching due to parton energy loss inside a dense medium are included
phenomenologically. The intrinsic and its broadening in and
collisions due to initial multiple parton scattering are found to be very
important at low energies ( GeV). Comparisons with ,
and data with different centrality cuts show that the differential
cross sections of large transverse momentum pion production ( GeV/)
in collisions scale very well with the number of binary nucleon-nucleon
collisions (modulo effects of multiple initial scattering). This indicates that
semi-hard parton scattering is the dominant particle production mechanism
underlying the hadron spectra at moderate GeV/.
However, there is no evidence of jet quenching or parton energy loss. Within
the parton model, one can exclude an effective parton energy loss
GeV/fm and a mean free path fm from the
experimental data of collisions at the SPS energies. Predictions for high
particle spectra in and collisions with and without jet
quenching at the RHIC energy are also given. Uncertainties due to initial
multiple scattering and nuclear shadowing of parton distributions are also
discussed.Comment: 13 pages in RevTex with 14 figures, the final published version (with
some typos corrected
The quality of research synthesis in surgery: the case of laparoscopic surgery for colorectal cancer
Peer reviewedPublisher PD
Democratisation via Elections in an African 'Narco State'? - The Case of Guinea-Bissau
Assessment of microbial DNA extraction methods of cadaver soil samples for criminal investigations
<p>Gravesoil beneath decomposing cadavers undergoes substantial biochemical changes that have the potential to aid in PMI estimation and identification of clandestine gravesites. The use of DNA extraction methods is necessary for culture-independent downstream molecular applications such as PCR and next-generation sequencing. In this study, a comparison of four methods was performed for cadaver-soil collected beneath the heads and feet of 11 cadavers decaying in a natural setting. The four methods isolated 3.6–263 ng/μl of genomic DNA as determined by optical density analysis. The purity of the extracted DNA according to A<sub>260/280</sub> and A<sub>260/230</sub> ratios was determined. The A<sub>260/280</sub> and A<sub>260/230</sub> ratios were 1.24–1.97 and 0.27–2.12, respectively. The optical density at 320 nm was measured for humic acid quantification of the lysates from the method that provided the most efficient removal of humic acid. The results demonstrated that this method provided a 98% reduction of humic acid. PCR of 16S rRNA genes followed by gel electrophoresis was performed. The statistical analysis revealed a significant correlation between the yields and days on/in the soil using a phenol-chloroform method for soil collected at the head and feet. No earlier published work has extensively elucidated the efficacy of DNA extraction methods for DNA obtained from cadaver-soil.</p