Evaluación de cultivares de arroz (Oryza sativa L.) bajo condiciones de secano y riego. Panamá. 2002-2003.

Se evaluó la estabilidad (AMMI y el Biplot GGESREG) y otras características de 20 genotipos de arroz, en secano y riego. Para el sistema de secano, hubo diferencias en rendimiento, sobresaliendo FLAR 54-00, IDIAP 38 y Lajas 02-00. En calidad de grano, el rendimiento total varió entre 61,8 a 68,0%, los granos enteros entre 43,6 y 56,5%, y el centro blanco varió entre 1,5 y 3,4. Para la digestión alcalina, diez genotipos mostraron grados de dispersión entre seis y siete con baja temperatura de gelatinización, ocho con grado de cuatro a cinco considerados intermedios. El FLAR 54-00 respondió mejor a los estímulos ambientales. Prosequisa, CHI 32-10 y CHI 45-23, presentaron el comportamiento más pobre en la mayoría de ambientes. El modelo Biplot GGESREG, identificó como genotipos estables, al FLAR 54-00, FLAR 198-00 y Fedearroz 50. Para el sistema de riego, hubo diferencias en rendimiento, destacándose IDIAP 38, P-3621 y Fedearroz 50. La calidad de granos, mostró rendimiento total entre 65,8 a 70,9%, granos enteros entre 51,5 y 62,0%, la incidencia de centro blanco varió entre 1,2 y 2,8. En digestión alcalina, nueve genotipos presentaron grados de seis y siete, y diez genotipos con grados de cuatro a cinco. IDIAP 38, P- 3621 y FLAR 54-00, respondieron mejor a los estímulos ambientales. Prosequisa, FLAR 195-00, CHI 49-16 y CHI 13- 256, presentaron el comportamiento más pobre. Los genotipos más estables bajo riego, fueron Fedearroz 50, IDIAP 38 y P-3621

Evaluación de cultivares de arroz (Oryza sativa L.) bajo condiciones de secano y riego. Panamá. 2002-2003

The stability and other characteristics of 20genotypes of rice, grown under dry-land and irrigationconditions, were evaluated. Statistical analyses wereconducted (AMMI and Biplot GGESREG) to estimatestability. For the dryland system, there were differences inyield, excelling FLAR 54-00, 38 IDIAP and Lajas 02-00.Total yield fluctuated between 61.8 and 68.0%, entire grainsbetween 43.6 and 56.5% and the white center between 1.5 and3.4%. The alkaline digestion showed ten genotypes withdegrees of dispersion between six and seven with lowtemperature of gelatinización, eight with degrees from 4 to 5considered intermediate. FLAR 54-00 responded better to theenvironmental. Prosequisa, CHI 32-10 and CHI 45-23 showedthe poorest behavior. The model Biplot GGESREG identifiedFLAR 54-00, FLAR 198-00 and Fedearroz 50 as stablegenotypes. For the irrigation system, statistical DMS (P<0.05)indicated differences in yield, standing out IDIAP 38, P-3621and Fedearroz 50. The quality of grains showed total yieldbetween 65.8 – 70.9%, entire grains between 51.5 and 62.0%,and incidence of white center between 1.2 and 2.8%. In thealkaline digestion, nine genotypes presented degrees of sixand seven and ten with degrees from 4 to 5. IDIAP 38, P-3621and FLAR 54-00, responded better to the environmentalstimuli. Prosequisa, FLAR 195-00, CHI 49-16 and CHI 13-256 presented the poorest behavior. The stable genotypesunder irrigation were Fedearroz 50, 38 IDIAP and P-3621.Se evaluó la estabilidad (AMMI y el Biplot GGESREG) yotras características de 20 genotipos de arroz, en secano y riego.Para el sistema de secano, hubo diferencias en rendimiento,sobresaliendo FLAR 54-00, IDIAP 38 y Lajas 02-00. Encalidad de grano, el rendimiento total varió entre 61,8 a68,0%, los granos enteros entre 43,6 y 56,5%, y el centroblanco varió entre 1,5 y 3,4. Para la digestión alcalina, diezgenotipos mostraron grados de dispersión entre seis y sietecon baja temperatura de gelatinización, ocho con grado decuatro a cinco considerados intermedios. El FLAR 54-00 respondiómejor a los estímulos ambientales. Prosequisa, CHI32-10 y CHI 45-23, presentaron el comportamiento más pobreen la mayoría de ambientes. El modelo Biplot GGESREG,identificó como genotipos estables, al FLAR 54-00, FLAR198-00 y Fedearroz 50. Para el sistema de riego, hubo diferenciasen rendimiento, destacándose IDIAP 38, P-3621 y Fedearroz50. La calidad de granos, mostró rendimiento totalentre 65,8 a 70,9%, granos enteros entre 51,5 y 62,0%, la incidenciade centro blanco varió entre 1,2 y 2,8. En digestiónalcalina, nueve genotipos presentaron grados de seis y siete,y diez genotipos con grados de cuatro a cinco. IDIAP 38, P-3621 y FLAR 54-00, respondieron mejor a los estímulos ambientales.Prosequisa, FLAR 195-00, CHI 49-16 y CHI 13-256, presentaron el comportamiento más pobre. Losgenotipos más estables bajo riego, fueron Fedearroz 50,IDIAP 38 y P-3621

Measuring KS0K± interactions using Pb–Pb collisions at √sNN=2.76 TeV

We present the first ever measurements of femtoscopic correlations between the K0 S and K± particles. The analysis was performed on the data from Pb–Pb collisions at √sNN = 2.76 TeV measured by the ALICE experiment. The observed femtoscopic correlations are consistent with final-state interactions proceeding via the a0(980) resonance. The extracted kaon source radius and correlation strength parameters for K0 SK− are found to be equal within the experimental uncertainties to those for K0 SK+. Comparing the results of the present study with those from published identical-kaon femtoscopic studies by ALICE, mass and coupling parameters for the a0 resonance are tested. Our results are also compatible with the interpretation of the a0 having a tetraquark structure instead of that of a diquar

Anomalous evolution of the near-side jet peak shape in Pb–Pb collisions at √sNN = 2.76 TeV

The measurement of two-particle angular correlations is a powerful tool to study jet quenching in a pT region inaccessible by direct jet identification. In these measurements pseudorapidity (Δη) and azimuthal (Δφ) differences are used to extract the shape of the near-side peak formed by particles associated to a higher pT trigger particle (1<pT,trig< 8 GeV/c). A combined fit of the near-side peak and long-range correlations is applied to the data allowing the extraction of the centrality evolution of the peak shape in Pb-Pb collisions at sNN−−−√ = 2.76 TeV. A significant broadening of the peak in the Δη direction at low pT is found from peripheral to central collisions, which vanishes above 4 GeV/c, while in the Δφ direction the peak is almost independent of centrality. For the 10% most central collisions and 1<pT,assoc< 2 GeV/c, 1<pT,trig< 3 GeV/c a novel feature is observed: a depletion develops around the centre of the peak. The results are compared to pp collisions at the same centre of mass energy and to AMPT model simulations. The comparison to the investigated models suggests that the broadening and the development of the depletion is connected to the strength of radial and longitudinal flow

Measurement of electrons from beauty-hadron decays in p–Pb collisions at √sNN = 5.02 TeV and Pb–Pb collisions at √sNN = 2.76 TeV

The production of beauty hadrons was measured via semi-leptonic decays at mid-rapidity with the ALICE detector at the LHC in the transverse momentum interval 1<pT<8 GeV/c in minimum-bias p-Pb collisions at sNN−−−√=5.02 TeV and in 1.3<pT<8 GeV/c in the 20% most central Pb-Pb collisions at sNN−−−√=2.76 TeV. The pp reference spectra at s√=5.02 TeV and s√=2.76 TeV, needed for the calculation of the nuclear modification factors RpPb and RPbPb, were obtained by a pQCD-driven scaling of the cross section of electrons from beauty-hadron decays measured at s√=7 TeV. In the pT interval 3<pT<8 GeV/c a suppression of the yield of electrons from beauty-hadron decays is observed in Pb-Pb compared to pp collisions. Towards lower pT, the RPbPb values increase with large systematic uncertainties. The RpPb is consistent with unity within systematic uncertainties and is well described by theoretical calculations that include cold nuclear matter effects in p-Pb collisions. The measured RpPb and these calculations indicate that cold nuclear matter effects are small at high transverse momentum also in Pb-Pb collisions. Therefore, the observed reduction of RPbPb below unity at high pT may be ascribed to an effect of the hot and dense medium formed in Pb-Pb collisions

Elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity in Pb–Pb collisions at √sNN = 2.76 TeV

The elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity (|y| < 0.7) is measured in Pb-Pb collisions at sNN−−−√=2.76 TeV with ALICE at the LHC. The particle azimuthal distribution with respect to the reaction plane can be parametrized with a Fourier expansion, where the second coefficient (v2) represents the elliptic flow. The v2 coefficient of inclusive electrons is measured in three centrality classes (0-10%, 10-20% and 20-40%) with the event plane and the scalar product methods in the transverse momentum (pT) intervals 0.5-13 GeV/c and 0.5-8 GeV/c, respectively. After subtracting the background, mainly from photon conversions and Dalitz decays of neutral mesons, a positive v2 of electrons from heavy-flavour hadron decays is observed in all centrality classes, with a maximum significance of 5.9σ in the interval 2< pT < 2.5 GeV/c in semi-central collisions (20-40%). The value of v2 decreases towards more central collisions at low and intermediate pT (0.5 < pT < 3 GeV/c). The v2 of electrons from heavy-flavour hadron decays at mid-rapidity is found to be similar to the one of muons from heavy-flavour hadron decays at forward rapidity (2.5 < y < 4). The results are described within uncertainties by model calculations including substantial elastic interactions of heavy quarks with an expanding strongly-interacting medium

Measurement of electrons from beauty-hadron decays in p-Pb collisions at sNN=5.02 \sqrt{s_{\mathrm{NN}}}=5.02 TeV and Pb-Pb collisions at sNN=2.76 \sqrt{s_{\mathrm{NN}}}=2.76 TeV

The production of beauty hadrons was measured via semi-leptonic decays at mid-rapidity with the ALICE detector at the LHC in the transverse momentum interval 1<p$_{T}$ < 8 GeV/c in minimum-bias p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV and in 1.3 < p$_{T}$ < 8 GeV/c in the 20% most central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV. The pp reference spectra at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV and $\sqrt{s}=2.76$ TeV, needed for the calculation of the nuclear modification factors R$_{pPb}$ and R$_{PbPb}$, were obtained by a pQCD-driven scaling of the cross section of electrons from beauty-hadron decays measured at $\sqrt{s}=7$ TeV. In the p$_{T}$ interval 3 < p$_{T}$ < 8 GeV/c, a suppression of the yield of electrons from beauty-hadron decays is observed in Pb-Pb compared to pp collisions. Towards lower p$_{T}$, the R$_{PbPb}$ values increase with large systematic uncertainties. The R$_{pPb}$ is consistent with unity within systematic uncertainties and is well described by theoretical calculations that include cold nuclear matter effects in p-Pb collisions. The measured R$_{pPb}$ and these calculations indicate that cold nuclear matter effects are small at high transverse momentum also in Pb-Pb collisions. Therefore, the observed reduction of R$_{PbPb}$ below unity at high p$_{T}$ may be ascribed to an effect of the hot and dense medium formed in Pb-Pb collisions