Study of e+e−→ppˉe^+e^- \rightarrow p\bar{p} in the vicinity of ψ(3770)\psi(3770)

Using 2917 $\rm{pb}^{-1}$ of data accumulated at 3.773~$\rm{GeV}$, 44.5~$\rm{pb}^{-1}$ of data accumulated at 3.65~$\rm{GeV}$ and data accumulated during a $\psi(3770)$ line-shape scan with the BESIII detector, the reaction $e^+e^-\rightarrow p\bar{p}$ is studied considering a possible interference between resonant and continuum amplitudes. The cross section of $e^+e^-\rightarrow\psi(3770)\rightarrow p\bar{p}$, $\sigma(e^+e^-\rightarrow\psi(3770)\rightarrow p\bar{p})$, is found to have two solutions, determined to be ($0.059\pm0.032\pm0.012$) pb with the phase angle $\phi = (255.8\pm37.9\pm4.8)^\circ$ ($<$0.11 pb at the 90% confidence level), or $\sigma(e^+e^-\rightarrow\psi(3770)\rightarrow p\bar{p}) = (2.57\pm0.12\pm0.12$) pb with $\phi = (266.9\pm6.1\pm0.9)^\circ$ both of which agree with a destructive interference. Using the obtained cross section of $\psi(3770)\rightarrow p\bar{p}$, the cross section of $p\bar{p}\rightarrow \psi(3770)$, which is useful information for the future PANDA experiment, is estimated to be either ($9.8\pm5.7$) nb ($<17.2$ nb at 90% C.L.) or $(425.6\pm42.9)$ nb

Suppression of charged particle production at large transverse momentum in central Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm NN}} = 2.76 TeV

Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0-5% and 70-80% of the hadronic Pb-Pb cross section. The measured charged particle spectra in $|\eta|<0.8$ and $0.3 < p_T < 20$ GeV/$c$ are compared to the expectation in pp collisions at the same $\sqrt{s_{\rm NN}}$, scaled by the number of underlying nucleon-nucleon collisions. The comparison is expressed in terms of the nuclear modification factor $R_{\rm AA}$. The result indicates only weak medium effects ($R_{\rm AA} \approx$ 0.7) in peripheral collisions. In central collisions, $R_{\rm AA}$ reaches a minimum of about 0.14 at $p_{\rm T}=6$-7GeV/$c$ and increases significantly at larger $p_{\rm T}$. The measured suppression of high-$p_{\rm T}$ particles is stronger than that observed at lower collision energies, indicating that a very dense medium is formed in central Pb-Pb collisions at the LHC.Comment: 15 pages, 5 captioned figures, 3 tables, authors from page 10, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/98

Two-pion Bose-Einstein correlations in central Pb-Pb collisions at sNN\sqrt{s_{\rm NN}} = 2.76 TeV

The first measurement of two-pion Bose-Einstein correlations in central Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV at the Large Hadron Collider is presented. We observe a growing trend with energy now not only for the longitudinal and the outward but also for the sideward pion source radius. The pion homogeneity volume and the decoupling time are significantly larger than those measured at RHIC.Comment: 17 pages, 5 captioned figures, 1 table, authors from page 12, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/388

Characterization of Glyceridic and Unsaponifiable Compounds of Sacha Inchi ( Plukenetia huayllabambana

This work deals with the characterization of the main glyceridic and unsaponifiable components of oils obtained from Sacha inchi (Plukenetia huayllabambana L.) seed ecotypes collected during two harvests in the Department of Amazonas in Peru. The seed-oil yield was 30.3-41.2%; standing out are the high percentages of the ¿3- and ¿6-fatty acids series whose ranges lie within those of the present Regulation for Sacha inchi oils. Triacylglycerols with even equivalent carbon number (ECN; 36-42) were the main components. Minor glyceridic polar compounds such as oxidized triglycerides, diglycerides, monoglycerides, and free fatty acids were determined by high-performance size exclusion chromatography. The low campesterol/stigmasterol ratio (1:6), unusual in the majority of vegetable oils, stands out. Regarding aliphatic hydrocarbons, these oils showed a particular profile for the saturated series of odd and even carbon atom numbers. According to our results Sacha inchi P. huayllabambana oils can be offered as a good alternative to P. volubilis, the species mainly commercialized for this vegetable oil

Dynamics of volatile compounds during longan juice fermentation by three yeasts from the genus williopsis

10.1556/AAlim.40.2011.3.9Acta Alimentaria403385-39

Effects of essential oil combinations on sheep ruminal fermentation and digestibility of a diet with fumarate included

Four Hu sheep (27.5 ± 2.6 kg body weight), fitted with ruminal and duodenal fistula, were used to investigate the effects of a mixture of essential oils (EO) or their active components on rumen fermentation, microbial population, and nutrient digestibility. Four treatments in 4 × 4 Latin square design were used: basal diet added with 25 g/day monosodium fumarate (Control); Control plus 1 g/day of EO combinations (EOC, mixture of equal ratio of oil from clove, oregano, cinnamon, and lemon); and Control plus 0.5 or 1.0 g/day EO active component combinations (EOAC, mixture of eugenol, carvacrol, citral and cinnamaldehyde in equal ratio). The EOC and EOAC treatments were absorbed into microporous starch, and the complex was encapsulated with sodium alginate before use. Each treatment period lasted for 21 days, including 12 days for adaptation. Rumen samples were taken to determine volatile fatty acid (VFA) content and microbial flora. Microbial populations were measured using real-time PCR. The apparent digestibility of nutrients in the total tracts or at different tract parts was measured through total collection method or indicator method, respectively. Rumen pH did not change with the addition of EOC or EOAC. Ammonia nitrogen concentration decreased after addition of either EOC or EOAC. Total VFA content decreased with the addition of EOC or high level of EOAC, with little change under low dose of EOAC. Propionate increased (P<0.05) in animals treated with EOAC or 0.5 g EOAC compared with the control. The ratio of acetate to propionate decreased (P<0.05) with the addition of EOC or EOAC. Protozoan population decreased (P<0.05) with the addition EOC and EOAC, with lower population in the EOAC-treated animals than in the EOC-treated group. The growth of methanogens, Fibrobacter succinogenes, and Butyrivibrio fibrisolvens (P<0.05) was inhibited by addition of EOAC, but not by EOC. Population of fungi and Ruminococcus flavefaciens did not change with the addition of EOC or EOAC. Addition of EOC and EOAC did not influence the feed intake and digestibility of the nutrients in total or at different parts of the digestive tract, but decreased ruminal protein digestibility. Addition of EOC and EOAC has no obvious harmful effects on rumen fermentation in terms of ruminal dry matter and fiber digestibility was not influenced. The proportion of ruminal propionate increased, and protein degradation was inhibited. In this study, the addition of 1 g/day EOC or EOAC had no detrimental effects on sheep nutrient digestion