795 research outputs found

    Adaptability of sugarcane (Saccharum spp.) clones, introduced by exchange to southeastern Mexico.

    Get PDF
    ABSTRAC Objetive: To evaluate sugarcane clones in the adaptability phase, and select those with higher yield in field and factory than commercial control clones. Design/methodology/approach: 14 clones of sugarcane in the first cycle were evaluated. The experimental design consisted of randomized complete blocks with four replications. The following agricultural characteristics were evaluated: stem weight, population and yield; as well as the industrial characteristics: sucrose content, juice purity and theoretical sugar production. They were compared with the values ​​of local clones MEX 69-290 and CP 72-2086 that served as controls. Results: There were found statistical differences in agricultural and industrial characteristics between clones. In stem weight, clone LTMEX 94-02 was the heaviest. In population, clone Mex 95-35 was the one that presented the highest number of stems per ha. Regarding yield in the field, clone COLPOSCTMEX 09-1433 was the one that obtained significantly higher tonnage per hectare compared to the two control clones. Among the factory characteristics, the clone MEX 96-10 had a significantly higher concentration of sucrose and with the highest value in juice purity, and in theoretical sugar production. Clone COLPOSCTMEX 09-1433 presented the highest value of theorical sugar yield in comparison to the two control clones. Limitation on study/implications: Although data from the new clones are relevant, they belong to an only one cycle. Findings/conclusions: At least four clones evaluated showed high field and factory yields: COLPOSCTMEX 09-1433, LTMEX 94-02, MEX 95-59, and MOTZMEX 00-1192. In all four, field yield was statistically superior to that of the control MEX 69-290; thus, it is pertinent to continue with its evaluation and multiplication in the semi-commercial test phase. However, since they are introduced from other geographical regions, it is recommended to continue their evaluation under the environmental conditions of the region.Objective: To evaluate sugarcane (Saccharum spp.) clones in the adaptability phase and select those with high field and factory yields that significantly exceed the commercial control clones.Design/Methodology/Approach: Fourteen sugarcane clones were evaluated in a crop established for the first time and to which no cut has been made. The experimental design consisted of randomized complete blocks with four repetitions. The following agricultural characteristics were evaluated: stalk weight, population, and yield. The following industrial characteristics were likewise assessed: sucrose content, juice purity, and theoretical sugar production. Both values were compared with the values of the local clones MEX 69-290 and CP 72-2086 that were used as control.Results: Statistical differences were found in agricultural and industrial characteristics between clones. In terms of stalk weight, the LTMEX 94-02 clone stood out, while, in population terms, the Mex 95-35 clone recorded the highestnumber of stalks per ha. Regarding field yield, the COLPOSCTMEX 09-1433 clone obtained significantly higher tonnage per hectare than the two control clones. Among the factory characteristics, the MEX 96-10 clone stood out with a significantly higher concentration of sucrose and with the highest juice purity. Finally, the COLPOSCTMEX 09-1433 clone had the highest theoretical sugar production value, which was statistically superior to the two control clones.Study Limitations/Implications: The data were obtained from a crop establishedfor the first time.Findings/Conclusions: At least four clones showed high field and factory yields: COLPOSCTMEX 09-1433, LTMEX 94-02, MEX 95-59, and MOTZMEX 00-1192. All four showed a field performance that had better statistics than the control MEX 69-290; therefore, it would be appropriate to pursue its evaluation and multiplication during the semi-commercial test phase. However, since they were introduced, their evaluation should continue under the environmental conditions of the region

    Endocrine disruptors and spontaneous premature labor: a case control study

    Get PDF
    <p>Abstract</p> <p>Background</p> <p>Premature labor is a poorly understood condition. Estrogen is thought to play a key role and therefore the labor process may be affected by endocrine disruptors. We sought to determine whether or not an environmental toxicant, DDE, or dietary derived endocrine disruptors, daidzein and genistein, are associated with spontaneous preterm labor.</p> <p>Methods</p> <p>Cases were defined as primiparous patients having a preterm delivery at or before 35 weeks following the spontaneous onset of labor. Controls were defined as primiparous women who delivered on the same day as the cases but at term gestation.</p> <p>Over approximately 1 year, 26 cases and 52 controls were recruited. Subjects agreed to have blood tests on day one postpartum for DDE and for the phytoestrogens genistein and daidzein.</p> <p>Results</p> <p>The mean concentration of DDE was similar in the case and control groups: 4.29 vs 4.32 ng/g lipid p = .85. In the case group, 13/26 had detectable levels of daidzein (range 0.20 – 1.56 ng/ml) compared to 25/52 controls (range 0.21 – 3.26 ng/ml). The mean concentration of daidzein was similar in cases compared to controls: 0.30 vs .34 ng/ml p = 0.91. Of the case group,14/26 had detectable levels of genistein (range 0.20 – 2.19 ng/ml) compared to 32/52 controls (range 0.21 – 2.55 ng/ml). The mean concentration of genistein was similar in cases compared to controls: 0.39 vs 0.31 ng/ml, p = 0.61.</p> <p>Conclusion</p> <p>The serum levels of DDE in this population were found to be low.</p> <p>There appears to be no relationship between serum concentrations of DDE, daidzein, and genistein and spontaneous preterm labor in our population. The inability to identify an effect may be related to the comparatively low concentrations of DDE in our population and the rapid and variable reduction of phytoestrogens from women in labor.</p

    Search for a W' boson decaying to a bottom quark and a top quark in pp collisions at sqrt(s) = 7 TeV

    Get PDF
    Results are presented from a search for a W' boson using a dataset corresponding to 5.0 inverse femtobarns of integrated luminosity collected during 2011 by the CMS experiment at the LHC in pp collisions at sqrt(s)=7 TeV. The W' boson is modeled as a heavy W boson, but different scenarios for the couplings to fermions are considered, involving both left-handed and right-handed chiral projections of the fermions, as well as an arbitrary mixture of the two. The search is performed in the decay channel W' to t b, leading to a final state signature with a single lepton (e, mu), missing transverse energy, and jets, at least one of which is tagged as a b-jet. A W' boson that couples to fermions with the same coupling constant as the W, but to the right-handed rather than left-handed chiral projections, is excluded for masses below 1.85 TeV at the 95% confidence level. For the first time using LHC data, constraints on the W' gauge coupling for a set of left- and right-handed coupling combinations have been placed. These results represent a significant improvement over previously published limits.Comment: Submitted to Physics Letters B. Replaced with version publishe

    Search for the standard model Higgs boson decaying to a bbˉb\bar{b} pair in events with no charged leptons and large missing transverse energy using the full CDF data set

    Get PDF
    We report on a search for the standard model Higgs boson produced in association with a vector boson in the full data set of proton-antiproton collisions at s=1.96\sqrt{s} = 1.96 TeV recorded by the CDF II detector at the Tevatron, corresponding to an integrated luminosity of 9.45 fb−1^{-1}. We consider events having no identified charged lepton, a transverse energy imbalance, and two or three jets, of which at least one is consistent with originating from the decay of a bb quark. We place 95% credibility level upper limits on the production cross section times standard model branching fraction for several mass hypotheses between 90 and 150GeV/c2150 \mathrm{GeV}/c^2. For a Higgs boson mass of 125GeV/c2125 \mathrm{GeV}/c^2, the observed (expected) limit is 6.7 (3.6) times the standard model prediction.Comment: Accepted by Phys. Rev. Let

    Search for the standard model Higgs boson decaying to a bb pair in events with one charged lepton and large missing transverse energy using the full CDF data set

    Get PDF
    We present a search for the standard model Higgs boson produced in association with a W boson in sqrt(s) = 1.96 TeV p-pbar collision data collected with the CDF II detector at the Tevatron corresponding to an integrated luminosity of 9.45 fb-1. In events consistent with the decay of the Higgs boson to a bottom-quark pair and the W boson to an electron or muon and a neutrino, we set 95% credibility level upper limits on the WH production cross section times the H->bb branching ratio as a function of Higgs boson mass. At a Higgs boson mass of 125 GeV/c2 we observe (expect) a limit of 4.9 (2.8) times the standard model value.Comment: Submitted to Phys. Rev. Lett (v2 contains clarifications suggested by PRL

    Search for the standard model Higgs boson decaying into two photons in pp collisions at sqrt(s)=7 TeV

    Get PDF
    A search for a Higgs boson decaying into two photons is described. The analysis is performed using a dataset recorded by the CMS experiment at the LHC from pp collisions at a centre-of-mass energy of 7 TeV, which corresponds to an integrated luminosity of 4.8 inverse femtobarns. Limits are set on the cross section of the standard model Higgs boson decaying to two photons. The expected exclusion limit at 95% confidence level is between 1.4 and 2.4 times the standard model cross section in the mass range between 110 and 150 GeV. The analysis of the data excludes, at 95% confidence level, the standard model Higgs boson decaying into two photons in the mass range 128 to 132 GeV. The largest excess of events above the expected standard model background is observed for a Higgs boson mass hypothesis of 124 GeV with a local significance of 3.1 sigma. The global significance of observing an excess with a local significance greater than 3.1 sigma anywhere in the search range 110-150 GeV is estimated to be 1.8 sigma. More data are required to ascertain the origin of this excess.Comment: Submitted to Physics Letters

    Particle-yield modification in jet-like azimuthal di-hadron correlations in Pb-Pb collisions at sNN\sqrt{s_{\rm NN}} = 2.76 TeV

    Get PDF
    The yield of charged particles associated with high-pTp_{\rm T} trigger particles (8<pT<158 < p_{\rm T} < 15 GeV/cc) is measured with the ALICE detector in Pb-Pb collisions at sNN\sqrt{s_{\rm NN}} = 2.76 TeV relative to proton-proton collisions at the same energy. The conditional per-trigger yields are extracted from the narrow jet-like correlation peaks in azimuthal di-hadron correlations. In the 5% most central collisions, we observe that the yield of associated charged particles with transverse momenta pT>3p_{\rm T}> 3 GeV/cc on the away-side drops to about 60% of that observed in pp collisions, while on the near-side a moderate enhancement of 20-30% is found.Comment: 15 pages, 2 captioned figures, 1 table, authors from page 10, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/350

    Search for the standard model Higgs boson decaying to a bb pair in events with two oppositely-charged leptons using the full CDF data set

    Get PDF
    We present a search for the standard model Higgs boson produced in association with a Z boson in data collected with the CDF II detector at the Tevatron, corresponding to an integrated luminosity of 9.45/fb. In events consistent with the decay of the Higgs boson to a bottom-quark pair and the Z boson to electron or muon pairs, we set 95% credibility level upper limits on the ZH production cross section times the H -> bb branching ratio as a function of Higgs boson mass. At a Higgs boson mass of 125 GeV/c^2 we observe (expect) a limit of 7.1 (3.9) times the standard model value.Comment: To be submitted to Phys. Rev. Let

    Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

    Get PDF
    A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results
    • …
    corecore