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Long- and short-range correlations for pairs of charged particles are studied via two-particle angular correlations in pp collisions at s√=13 TeV and p−Pb collisions at sNN−−−√=5.02 TeV. The correlation functions are measured as a function of relative azimuthal angle Δφ and pseudorapidity separation Δη for pairs of primary charged particles within the pseudorapidity interval |η|<0.9 and the transverse-momentum interval 1<pT<4 GeV/c. Flow coefficients are extracted for the long-range correlations (1.6<|Δη|<1.8) in various high-multiplicity event classes using the low-multiplicity template fit method. The method is used to subtract the enhanced yield of away-side jet fragments in high-multiplicity events. These results show decreasing flow signals toward lower multiplicity events. Furthermore, the flow coefficients for events with hard probes, such as jets or leading particles, do not exhibit any significant changes compared to those obtained from high-multiplicity events without any specific event selection criteria. The results are compared with hydrodynamic-model calculations, and it is found that a better understanding of the initial conditions is necessary to describe the results, particularly for low-multiplicity events.
Polyunsaturated fatty acids (PUFAs) play essential roles in mediating inflammation and its resolution. PUFA metabolites generated by the cytochrome P450 (CYP) - soluble epoxide hydrolase (sEH) axis are known to regulate macrophage activation/polarization but little is known about their role in the resolution of inflammation. Monocytes were isolated from murine bone marrow or human peripheral blood and differentiated to naïve macrophages (M0). Thereafter cells were polarized using LPS and IFNγ (M1), IL-4 (M2a), or TGFβ1 (M2c). Gene expression was analyzed by RNA sequencing, RT-qPCR and Western blotting. Phagocytosis of zymosan and oxo-LDL were also assessed in vitro. Zymosan-induced peritonitis combined with immune cell profiling was used to evaluate the resolution of inflammation in vivo. The expression of sEH was comparable in M0, M1 and M2a macrophages but markedly elevated in M2c polarized cells. The increase in sEH expression elicited by TGFβ relied on the TGFβ receptor ALK5 and the phosphorylation of SMAD2, which was able to bind to the sEH promoter. In macrophages lacking sEH, M2c polarization was incomplete and characterized by lower levels of pro-resolving phagocytosis associated receptors (Tlr2 and Mrc1), as well as higher levels of the pro-inflammatory markers; Nlrp3, IL-1β and TNFα. Fitting with the failure to upregulate phagocytosis associated receptors, the uptake of zymosan and ox-LDL was less efficient in M2c macrophages from sEH-/- mice. The latter animals also demonstrated a retarded resolution of inflammation (zymosan-induced peritonitis) in vivo with fewer resident macrophages and recruited macrophages. PUFA profile analysis indicated decreased sEH substrates e.g., 11, 12-EET, as well as increased sEH products e.g., 11, 12-DHET, indicating an increased sEH activity in M2c macrophages. Taken together, our data indicates that sEH expression is required for the effective M2c polarization of macrophages and thus the resolution of inflammation.
Mid-rapidity transverse mass spectra and multiplicity densities of charged and neutral kaons are reported for Au + Au collisions at √sNN = 130 GeV at RHIC. The spectra are exponential in transverse mass, with an inverse slope of about 280 MeV in central collisions. The multiplicity densities for these particles scale with the negative hadron pseudo-rapidity density. The charged kaon to pion ratios are K+/π− = 0.161± 0.002(stat) ± 0.024(syst) and K−/π− = 0.146± 0.002(stat) ± 0.022(syst) for the most central collisions. The K+/π− ratio is lower than the same ratio observed at the SPS while the K−/π− is higher than the SPS result. The ratios are enhanced by about 50% relative to p + p and p¯ + p collision data at similar energies.