419 research outputs found
Ação de produtos naturais sobre a sobrevivência de Argyrotaenia sphaleropa (Meyrick) (Lepidoptera: Tortricidae) e seletividade de inseticidas utilizados na produção orgância de videira sobre Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae).
Nesse trabalho,foi estudado o efeito de formulações comerciais de inseticidas, com ênfase para os produtos permitidos na produção orgânica (nim. piretro natural e extrato pirolenhoso) para o controle de Argyrotaenia sph aleropu (Meyrick) (Lepidoptera: Torlricidae) e sua atuação sobre o parasitóide de ovos Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae), em laboratório. Os inseticidas Natuneem" (l500ppm de Azadirachta indica por litro) e o extrato pirolenhoso (Biopirol 7 M'), nas dosagens de 250 e 500mL 100L". não foram eficientes no controle de A. sphaleropa quando aplicados sobre folhas de videira (Vitis sp.) cultivar "Chardonnay ", enquanto que o piretro natural (250 e 500mL 100[-/) resultou em mortalidade significativa de 77,65 e 85,88% dos insetos, respectivamente, 120 horas após a aplicação. O efeito secundário foi avaliado sobre adultos do porasitàide de ovos T. pretiosum, seguindo a metodologia da International Organization for Biological and Integrated Control (IOBC). Os inseticidas Natuneem" (500mL 100L"), Biopirol 7 M' (500mL 100U) e Dipel DF' (IOOg 100L") foram inócuos «30% de redução no parasitismo por T. pretiosum), enquanto o piretro natural, nas dosagens de 250l1/L 100[-' e 500l1/L 100 L', foi classificado como moderadamente nocivo (80-99% de redução no parasitismo) e nocivo (>99% de redução no parasitismo). respectivamente, equivalendo-se ao efeito do fosforado Lebaycid 500~ (lOOmL 100 L"). Palavras-chave: inseticidas orgânicos, uva, efeito secundário, parasitoide de ovos. This work was conducted to study lhe effect of commercial formulations of insecticides with emphasis on that allowed in lhe organic production (neem, natural piretro and pirolenhoso extract) 10 control Argyrotaenia sph aleropu (Meyrick) (Lepidoptera: Tortricidae) and their performance on the egg parasitoid Trichogramma pretiosum Riley (Hymenoptera: Trichogrammaiidae) adults. The insecticides Natuneem® (l500ppm of azadirachtin L") and the pirolenhoso extract (Biopirol 7 M') (250 and 500mL 100L'/) lVere not efficienl in the control of A. sphuleropo when applied over grapevine leaves (Vitis sp.) cultivate Chardonnay. Natural piretro (250 and 500mL 100L") resulted in a mortality of 77.65 and 85.88% of insects, respectively 120 hours after application. The secondary effect of insecticides allowed was evaluated on adults of the egg parasitoid T. pretiosum following lnternational Organization for Biological and l ntegrated Control (IOBC) methodology. II \vas observed that Natuneem" (500mL 100U). Biopirol 7 M' (500mL 100[-') and Dipel DF' (lOOg 100L") had been innocuous «30% parasitism reduction) wh ile natural piretro (250mL 100L") was c/assified as moderately harmful (80-99% of parasitism reduction). Natural piretro in lhe higher dose (500mL 100[-') showed a parasitism reduction in more than 99% in lhe same way that lhe pattern Lebaycid 500' (lOOmL 100 L"). Key words: organic inseclicides, grape, secondary effects, egg parasitoid.bitstream/item/200089/1/7879-2006-p.1072-1078.pd
Seletividade de formulações de glyphosate aplicado nos estádios imaturos de Trichogramma pretiosum
Inclusive Search for Anomalous Production of High-pT Like-Sign Lepton Pairs in Proton-Antiproton Collisions at sqrt{s}=1.8 TeV
We report on a search for anomalous production of events with at least two
charged, isolated, like-sign leptons with pT > 11 GeV/c using a 107 pb^-1
sample of 1.8 TeV ppbar collisions collected by the CDF detector. We define a
signal region containing low background from Standard Model processes. To avoid
bias, we fix the final cuts before examining the event yield in the signal
region using control regions to test the Monte Carlo predictions. We observe no
events in the signal region, consistent with an expectation of
0.63^(+0.84)_(-0.07) events. We present 95% confidence level limits on new
physics processes in both a signature-based context as well as within a
representative minimal supergravity (tanbeta = 3) model.Comment: 15 pages, 4 figures. Minor textual changes, cosmetic improvements to
figures and updated and expanded reference
Measurement of the ttbar Production Cross Section in ppbar Collisions at sqrt(s) = 1.96 TeV
We present a measurement of the top quark pair production cross section in
ppbar collisions at sqrt(s)=1.96 TeV using 318 pb^{-1} of data collected with
the Collider Detector at Fermilab. We select ttbar decays into the final states
e nu + jets and mu nu + jets, in which at least one b quark from the t-quark
decays is identified using a secondary vertex-finding algorithm. Assuming a top
quark mass of 178 GeV/c^2, we measure a cross section of 8.7 +-0.9 (stat)
+1.1-0.9 (syst) pb. We also report the first observation of ttbar with
significance greater than 5 sigma in the subsample in which both b quarks are
identified, corresponding to a cross section of 10.1 +1.6-1.4(stat)+2.0-1.3
(syst) pb.Comment: Accepted for publication in Physics Review Letters, 7 page
Search for Long-lived Charged Massive Particles in anti-p p Collisions at s**1/2 = 1.8 TeV
We report a search for production of long-lived charged massive particles in
a data sample of 90 pb^{-1} of \sqrt{s} = 1.8 TeV p anti-p collisions recorded
by the Collider Detector at Fermilab (CDF). The search uses the muon-like
penetration and anomalously high ionization energy loss signature expected for
such a particle to discriminate it from backgrounds. The data is found to agree
with background expectations, and cross section limits of \cal{O} (1) pb are
derived using two reference models, a stable quark and a stable scalar lepton.Comment: 14 pages, 3 figure
Evidence for the exclusive decay Bc+- to J/psi pi+- and measurement of the mass of the Bc meson
We report first evidence for a fully reconstructed decay mode of the
B_c^{\pm} meson in the channel B_c^{\pm} \to J/psi \pi^{\pm}, with J/psi \to
mu^+mu^-. The analysis is based on an integrated luminosity of 360 pb$^{-1} in
p\bar{p} collisions at 1.96 TeV center of mass energy collected by the Collider
Detector at Fermilab. We observe 14.6 \pm 4.6 signal events with a background
of 7.1 \pm 0.9 events, and a fit to the J/psi pi^{\pm} mass spectrum yields a
B_c^{\pm} mass of 6285.7 \pm 5.3(stat) \pm 1.2(syst) MeV/c^2. The probability
of a peak of this magnitude occurring by random fluctuation in the search
region is estimated as 0.012%.Comment: 7 pages, 3 figures. Version 3, accepted by PR
Measurement of and Production in Collisions at = 1.96 TeV
The Standard Model predictions for and production are
tested using an integrated luminosity of 200 pb of \ppbar collision data
collected at the Collider Detector at Fermilab. The cross sections are measured
selecting leptonic decays of the and bosons, and photons with
transverse energy GeV that are well separated from leptons. The
production cross sections and kinematic distributions for the and
are compared to SM predictions.Comment: 7 pages, 4 figures, submitted to PR
Top quark mass measurement using the template method at CDF
We present a measurement of the top quark mass in the lepton+jets and
dilepton channels of decays using the template method. The data
sample corresponds to an integrated luminosity of 5.6 fb of
collisions at Tevatron with TeV, collected with the CDF II
detector. The measurement is performed by constructing templates of three
kinematic variables in the lepton+jets and two kinematic variables in the
dilepton channel. The variables are two reconstructed top quark masses from
different jets-to-quarks combinations and the invariant mass of two jets from
the decay in the lepton+jets channel, and a reconstructed top quark mass
and , a variable related to the transverse mass in events with two
missing particles, in the dilepton channel. The simultaneous fit of the
templates from signal and background events in the lepton+jets and dilepton
channels to the data yields a measured top quark mass of Comment: submitted to Phys. Rev.
Measurement of the Lifetime Difference Between B_s Mass Eigenstates
We present measurements of the lifetimes and polarization amplitudes for B_s
--> J/psi phi and B_d --> J/psi K*0 decays. Lifetimes of the heavy (H) and
light (L) mass eigenstates in the B_s system are separately measured for the
first time by determining the relative contributions of amplitudes with
definite CP as a function of the decay time. Using 203 +/- 15 B_s decays, we
obtain tau_L = (1.05 +{0.16}/-{0.13} +/- 0.02) ps and tau_H = (2.07
+{0.58}/-{0.46} +/- 0.03) ps. Expressed in terms of the difference DeltaGamma_s
and average Gamma_s, of the decay rates of the two eigenstates, the results are
DeltaGamma_s/Gamma_s = (65 +{25}/-{33} +/- 1)%, and DeltaGamma_s = (0.47
+{0.19}/-{0.24} +/- 0.01) inverse ps.Comment: 8 pages, 3 figures, 2 tables; as published in Physical Review Letters
on 16 March 2005; revisions are for length and typesetting only, no changes
in results or conclusion
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