105 research outputs found
Glyphosate resistance in four different populations of Lolium rigidum is associated with reduced translocation of glyphosate to meristematic zones
No full textThe definitive version is available at www.blackwell-synergy.comWeed populations with resistance to glyphosate have evolved over the last 7 years, since the discovery of the first glyphosate-resistant populations of Lolium rigidum in Australia. Four populations of L. rigidum from cropping, horticultural and viticultural areas in New South Wales and South Australia were tested for resistance to glyphosate by dose–response experiments. All populations required considerably more glyphosate to achieve 50% control compared with a known susceptible population, indicating they were resistant to glyphosate. Translocation of glyphosate within these resistant populations was examined by following the movement of radiolabelled glyphosate applied to a mature leaf. All resistant plants translocated significantly more herbicide to the tip of the treated leaf than did susceptible plants. Susceptible plants translocated twice as much herbicide to the stem meristematic portion of the plant compared with resistant plants. These different translocation patterns suggest an association between glyphosate resistance in L. rigidum and the ability of glyphosate to accumulate in the shoot meristem.A M Wakelin, D F Lorraine-Colwill, C Presto
D MESON LIFETIMES
No full textWe present the final results on the D-meson liftime measurements obtained by the NA27 experiment. From a sample of 145 D0 D0 and 149 D± decays, we have measured τ(D0)=(4.6+0.6-0.5)×10-1 3 s, τ(D±)=(11.2+1.4-1.1)×1 0-13 s, with a ratio R= τ(D±) τ(D0)=2.4±0.4. © 1987.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe
INCLUSIVE D MESON BRANCHING RATIOS
No full textCharm data from 360 GeV/c π-p and 400 GeV/c pp are used to give results on the D meson branching ratios. The analysis is based on 438 charm events containing 308 spatially resolved charm particle decays. We present topological branching ratios as well as inclusive branching ratios of the D-meson into kaons
MEASUREMENT OF D MESON BRANCHING RATIOS
No full textWe report a measurement of the exclusive B+ meson decay to the final state D- K+π+ using 520 × 10B ̄B pairs collected near the γ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy ee collider. Using the D-S → Ø- decay mode to reconstruct D- s mesons, we obtain the branching fraction B(B+ → D-s K+π+) = (1.77+0.12-0.12(stat)±0.16(syst) ±0.23(B))×10-4. We also present preliminary results of a study of the two-body DsK, Dsπ and Kπ subsystems observed in this final state
EXCLUSIVE HADRON BRANCHING RATIOS OF THE D MESON
No full textThe measurement of 12 D0 and 10 D± exclusive branching ratios are presented. The analysis is based on 608 spatially resolved charm particle decays produced in 360 GeV/c π-p and 400 GeV/c pp interactions. © 1987 Springer-Verlag.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe
D MESON PRODUCTION FROM 400-GeV/c p p INTERACTIONS. EVIDENCE FOR LEADING DIQUARKS?
No full textResults of fitting the differential distributions in xF and pT2 of D mesons produced in 400 GeV/c p-p interactions to the form View the MathML source are discussed. The D+ distribution is found to be relatively hard [n=3.1±0.8〈Pt2〉=1.32±0.27 (GeV/c)2] and the D̄0 distribution relatively soft [n=8.1±1.9,〈pT2〉=0.62±0.14 (GeV/c)2] compared to the average for all D's [n=4.9±0.5,〈pT2〉=0.99±0.10 (GeV/c)2]. It is suggested that these distributions could reflect contribution of leading di-quarks in pp collisions. Comparison is made with evidence for leading quarks in charm production in 360 GeV/cπ−p interactions
NEUTRAL AND CHARGED D* PRODUCTION IN 360-GeV/c pi- p INTERACTIONS
No full textThe first data on the production of D∗(2010) are presented as observed in π− -proton interactions at √s = 27 GeV. It is found that D∗(2010) dominates the total charm D-meson production, without a significant non-central component
D MESON PRODUCTION FROM 400-GeV/c p p INTERACTIONS
No full textWe have measured the inclusive production properties of D and View the MathML source messons produced from pp interactions at View the MathML source. The differential production cross section is well represented by the empirical form View the MathML source, and the inclusive View the MathML source cross section σView the MathML source is (30.2±3.3) ωb. The QCD fusion model predicts View the MathML source production which is in good agreement with our data except for the magnitude of the cross section which depends sensitively on the assumed mass of the charm quark
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