Taxonomic Value Of Foliar Characters In Dahlstedtia Malme - Leguminosae, Papilionoideae, Millettieae

Dahlstedtia Malme (Leguminosae) is a neotropical genus, native to the Brazilian Atlantic Forest, and comprises two species, D. pinnata (Benth.) Malme and D. pentaphylla (Taub.) Burk., although it has been considered a monotypic genus by some authors. Leaf anatomy was compared to verify the presence of anatomical characters to help delimit species. Foliar primordium, leaflet, petiolule, petiole and pulvinus were collected from cultivated plants (Campinas, SP, Brazil) and from natural populations (Picinguaba, Ubatuba and Caraguatatuba, SP, Brazil - D. pinnata; Antonina, PR, Brazil - D. pentaphylla). Studies on leaflet surface assessment (Scanning Electron Microscopy), as well as histology and venation analyses were carried out of dehydrated, fresh and fixed material from two species. Leaflet material was macerated for stomatal counts. Histological sections, obtained by free-hand cut or microtome, were stained with Toluidine Blue, Safranin/Alcian Blue, Ferric Chloride, Acid Phloroglucin. Secretory cavities are present in the lamina, petiolule, petiole, pulvinus and leaf primordium in D. pentaphylla, but not in D. pinnata, and can be considered an important character for species diagnosis. Other leaf characters were uninformative in delimiting Dahlstedtia species. There is cambial activity in the petiolule, petiole and pulvinus. This study, associated with other available data, supports the recognition of two species in Dahlstedtia.202395403Arduin, M., Krauss, J.E., (1997) Manual Básico de Técnicas em Anatomia Vegetal, , Rio de Janeiro, EdurBerlyn, G.P., Miksche, J.P., (1976) Botanical microtechnique and cytochemistry, , Ames, The Iowa State University PressBurkart, A., Dahlstedtia pinnata (Taub.) Burk., nov. comb (1957) Darwiniana, 11, p. 269Dormer, K.J., An investigation of the taxonomic value of shoot structure in Angiosperms with special reference to Leguminosae (1945) Annals of Botany, 9, pp. 141-153Fahn, A., (1979) Secretory Tissues in Plants, , New York, Academic PressFisher, D.B., An unusual layer of cells in the mesophyll of the soybean leaf (1967) Botanical Gazette, 128, pp. 215-218Foster, A.S., (1949) Practical Plant Anatomy, , New York, Van HostrandFreire, S.F., Anatomia foliar de las especies argentinas de la tribu Sophoreae, excepto Adesmia (Leguminosae, Papilionoideae) (1984) Darwiniana, 25, pp. 123-142Geesink, R., Tephrosieae (Benth.) Huch (1981) Advances in Legume Systematics, pp. 245-260. , Pp, R.M. Polhill & P.H. Raven eds, Kew, Royal Botanic GardensGeesink, R., Scala Millettiearum (1984) Leiden Botanical Series, 1. , A survey of the genera of the tribe Millettieae Leguminosae, Papilionoideae, E.J. Brill & Leiden University PressGerlach, G., (1969) Botanische Mikrotechnik, eine Einfuhrung, , Stuttgard, Gorg ThiemeHickey, L.J., Wolfe, J.A., The bases of Angiosperm Phylogeny: Vegetative Morphology (1975) Annals of Missouri Botanical Garden, 62, pp. 538-589Hutchinson, J., (1964) The genera of flowering plants (Angiospermae) - Dicotyledons, 1. , Oxford, Clarendon PressJohansen, D.A., (1940) Plant Microtechnique, , New York, McGraw-Hill Book Company IncKevekordes, K.G., McCully, M.E., Canny, M.J., The occurrence of an extended bundle sheath system (paraveinal mesophyll) in the legumes (1988) Canadian Journal of Botany, 66, pp. 94-100Kothari, M.J., Shah, G.L., Epidermal structures and ontogeny of stomata in the Papilionaceae (tribe Hedysareae) (1975) Botanical Gazette, 136, pp. 372-379Lersten, N.R., Curtis, J.D., Leaf anatomy in Caesalpinia and Hoffmannseggia (Leguminosae, Caesalpinioideae) with emphasis on secretory structures (1994) Plant Systematics and Evolution, 192, pp. 231-255Malme, G., Dahlstedtia, eine neue Leguminosen - Gattung (1905) Arkiv Botanische, 4, pp. 1-7Mauseth, J.D., (1988) Plant Anatomy, , Menlo Park, The Benjamin Cummings Publishing CompanyMetcalfe, C.R., Chalk, L., (1950) Anatomy of the Dicotyledons: Leaves, stem and wood in relation to taxonomy with notes one economic uses, 1. , Oxford, Clarendon PressMonteiro, W.R., Giulietti, A.M., Mazzoni, S.C., Castro, M.M., Hairs on reproductive organs of some Eriocaulaceae and their taxonomic significance (1979) Boletim de Botânica da Universidade de São Paulo, 7, pp. 43-59Shtromberg, A., Cambial activity in leaves of some woody dicotyledons (1959) Doklady Botanical Sciences Sections (Doklady Akademii Nauk SSSR), 124, pp. 699-702Smith, F.H., Smith, E.C., Anatomy of the inferior ovary of Darbya (1942) American Journal of Botany, 29, pp. 464-471Solereder, H., (1908) Systematic anatomy of the Dicotyledons, 1. , A handbook for laboratories of pure and applied Botany. Translated by L.A. Boodle & F.G. Fritsch, v, Oxford, Clarendon PressTeixeira, S.P., Gabrielli, A.C., Anatomia do eixo vegetativo de Dahlstedtia pinnata (Benth.) Malme e D. pentaphylla (Taub.) Burkart (Leguminosae, Papilionoideae) (2000) Brazilian Journal of Botany, 23, pp. 1-11Teixeira, S.P., Castro, M.M., Tozzi, A.M.G.A., Secretory cavities and pellucid dots in leaflets of Lonchocarpus (Leguminosae, Papilionoideae, Millettieae) (2000) Plant Systematics and Evolution, 221, pp. 61-68Turner, G.W., Comparative development of secretory cavities in the tribes Amorpheae and Psoraleeae (Leguminosae: Papilionoideae) (1986) American Journal of Botany, 73, pp. 1178-1192Vanni, R.O., Rodríguez, M., Dahlstedtia (Leguminosae, Millettieae) nueva cita para la flora argentina (1999) Hickenia, 3, pp. 5-8Watari, S., Anatomical studies on some Leguminous leaves with special reference to the vascular system in petioles and rachises (1934) Journal of the Faculty of Science, Imperial University of Tokyo, 3, pp. 225-369Weston, G.D., Cass, D.D., Observations on the development of the paraveinal mesophyll of soybean leaves (1973) Botanical Gazette, 134, pp. 232-235Zar, J.H., (1996) Biostatistical analysis, , 3rd ed. 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Measurement of the production cross section of prompt j/psi mesons in association with a W (+/-) boson in pp collisions root s=7 TeV with the ATLAS detector

The process pp → W±J/ψ provides a powerful probe of the production mechanism of charmonium in hadronic collisions, and is also sensitive to multiple parton interactions in the colliding protons. Using the 2011 ATLAS dataset of 4.5 fb-1 of p s = 7TeV pp collisions at the LHC, the first observation is made of the production of W± + prompt J/ events in hadronic collisions, using W± → μ and J/ψ → μ+μ-. A yield of 27.4±7.5 -6.5 W± + prompt J/ψ events is observed, with a statistical significance of 5.1. The production rate as a ratio to the inclusive W± boson production rate is measured, and the double parton scattering contribution to the cross section is estimated. Copyright CERN, for the benefit of the ATLAS Collaboration

Burden and risk factors for Pseudomonas aeruginosa community-acquired pneumonia:a Multinational Point Prevalence Study of Hospitalised Patients

Pseudornonas aeruginosa is a challenging bacterium to treat due to its intrinsic resistance to the antibiotics used most frequently in patients with community-acquired pneumonia (CAP). Data about the global burden and risk factors associated with P. aeruginosa-CAP are limited. We assessed the multinational burden and specific risk factors associated with P. aeruginosa-CAP. We enrolled 3193 patients in 54 countries with confirmed diagnosis of CAP who underwent microbiological testing at admission. Prevalence was calculated according to the identification of P. aeruginosa. Logistic regression analysis was used to identify risk factors for antibiotic-susceptible and antibiotic-resistant P. aeruginosa-CAP. The prevalence of P. aeruginosa and antibiotic-resistant P. aeruginosa-CAP was 4.2% and 2.0%, respectively. The rate of P. aeruginosa CAP in patients with prior infection/colonisation due to P. aeruginosa and at least one of the three independently associated chronic lung diseases (i.e. tracheostomy, bronchiectasis and/or very severe chronic obstructive pulmonary disease) was 67%. In contrast, the rate of P. aeruginosa-CAP was 2% in patients without prior P. aeruginosa infection/colonisation and none of the selected chronic lung diseases. The multinational prevalence of P. aeruginosa-CAP is low. The risk factors identified in this study may guide healthcare professionals in deciding empirical antibiotic coverage for CAP patients

Operation and performance of the ATLAS semiconductor tracker

The semiconductor tracker is a silicon microstrip detector forming part of the inner tracking system of the ATLAS experiment at the LHC. The operation and performance of the semiconductor tracker during the first years of LHC running are described. More than 99% of the detector modules were operational during this period, with an average intrinsic hit efficiency of (99.74±0.04)%. The evolution of the noise occupancy is discussed, and measurements of the Lorentz angle, δ-ray production and energy loss presented. The alignment of the detector is found to be stable at the few-micron level over long periods of time. Radiation damage measurements, which include the evolution of detector leakage currents, are found to be consistent with predictions and are used in the verification of radiation background simulations

Search for H→γγ produced in association with top quarks and constraints on the Yukawa coupling between the top quark and the Higgs boson using data taken at 7 TeV and 8 TeV with the ATLAS detector

A search is performed for Higgs bosons produced in association with top quarks using the diphoton decay mode of the Higgs boson. Selection requirements are optimized separately for leptonic and fully hadronic final states from the top quark decays. The dataset used corresponds to an integrated luminosity of 4.5 fb−14.5 fb−1 of proton–proton collisions at a center-of-mass energy of 7 TeV and 20.3 fb−1 at 8 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. No significant excess over the background prediction is observed and upper limits are set on the tt¯H production cross section. The observed exclusion upper limit at 95% confidence level is 6.7 times the predicted Standard Model cross section value. In addition, limits are set on the strength of the Yukawa coupling between the top quark and the Higgs boson, taking into account the dependence of the tt¯H and tH cross sections as well as the H→γγ branching fraction on the Yukawa coupling. Lower and upper limits at 95% confidence level are set at −1.3 and +8.0 times the Yukawa coupling strength in the Standard Model

Fiducial and differential cross sections of Higgs boson production measured in the four-lepton decay channel in pp collisions at √s = 8 TeV with the ATLAS detector

Measurements of fiducial and differential cross sections of Higgs boson production in the H→ZZ∗ → 4ℓ decay channel are presented. The cross sections are determined within a fiducial phase space and corrected for detection efficiency and resolution effects. They are based on 20.3 fb−¹ of pp collision data, produced at √s = 8 TeV centre-of-mass energy at the LHC and recorded by the ATLAS detector. The differential measurements are performed in bins of transverse momentum and rapidity of the four-lepton system, the invariant mass of the subleading lepton pair and the decay angle of the leading lepton pair with respect to the beam line in the four-lepton rest frame, as well as the number of jets and the transverse momentum of the leading jet. The measured cross sections are compared to selected theoretical calculations of the Standard Model expectations. No significant deviation from any of the tested predictions is found

Measurement of the View the tt production cross-section using eμ events with b-tagged jets in pp collisions at √s = 13 TeV with the ATLAS detector

This paper describes a measurement of the inclusive top quark pair production cross-section (σtt¯) with a data sample of 3.2 fb−1 of proton–proton collisions at a centre-of-mass energy of √s = 13 TeV, collected in 2015 by the ATLAS detector at the LHC. This measurement uses events with an opposite-charge electron–muon pair in the final state. Jets containing b-quarks are tagged using an algorithm based on track impact parameters and reconstructed secondary vertices. The numbers of events with exactly one and exactly two b-tagged jets are counted and used to determine simultaneously σtt¯ and the efficiency to reconstruct and b-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section is measured to be: σtt¯ = 818 ± 8 (stat) ± 27 (syst) ± 19 (lumi) ± 12 (beam) pb, where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, the integrated luminosity and the LHC beam energy, giving a total relative uncertainty of 4.4%. The result is consistent with theoretical QCD calculations at next-to-next-to-leading order. A fiducial measurement corresponding to the experimental acceptance of the leptons is also presented

Search for the Standard Model Higgs boson decay to μ+μ− with the ATLAS detector

A search is reported for Higgs boson decay to μ+μ−μ+μ− using data with an integrated luminosity of 24.8 fb−124.8 fb−¹ collected with the ATLAS detector in pp collisions at √s=7 and 8 TeV at the CERN Large Hadron Collider. The observed dimuon invariant mass distribution is consistent with the Standard Model background-only hypothesis in the 120–150 GeV search range. For a Higgs boson with a mass of 125.5 GeV, the observed (expected) upper limit at the 95% confidence level is 7.0 (7.2) times the Standard Model expectation. This corresponds to an upper limit on the branching ratio BR(H→μ+μ−)of 1.5×10−31.5×10−3