In relativistic heavy ion collisions, the cross section of heavy hadron production via the combination of a heavy quark with a light one from the quark-gluon matter can be factorized. It is the convolution of twist-4 combination matrix elements, the parameters corresponding to the parton distributions of the quark-gluon matter, as well as the hard partonic cross section of heavy quark productio...

background: l1 retrotransposons are the most active mobile dna elements in human genome. unregulated l1 retrotransposition may have deleterious effect by disrupting vital genes and inducing genomic instabilities. therefore, human cells control l1 elements by silencing their activities through epigenetic mechanisms. it has been shown that cell division and heavy metals stimulate the frequency of...

To detect heavy metal contents in fruits rapidly, the Citrus Nanfeng tangerines pericarp and flesh have been analyzed by laser induced breakdown spectroscopy. Line emissions from five heavy metal elements, Pb, Cd, Hg,Cr and As, have been clearly extracted. Their intensities correspond to relative concentrations of these elements contained in the analyzed samples. The results demonstrated that t...