2,836 research outputs found
Eimeria Curvata N. Sp.(apicomplexa: Eimeriidae) In Columbina Talpacoti And Scardafella Squammata (aves: Columbidae) From Brazil.
Eimeria curvata is a new coccidian described in the doves Columbina talpacoti and Scardafella squammata from western of the State of São Paulo, Brazil. The oocysts are ovoid to ellipsoid, 18.3 (17-19) microm x 15.5 (15-17) microm, with a shape index of 1.2 (1.1-1.3). The wall is colorless, smooth and double-layered. A polar granule is present, but there is no micropyle or oocyst residuum. The sporocysts are elongate, 12.3 (11.5-13) microm x 5.8 (5.5-6) microm with a curved anterior portion and a smooth, thin, single-layered wall. The Stieda body is protuberant and nipple-like; there is no substieda body. The sporozoites lie head-to-tail in the sporocyst and contain a large refractile body at the extremities. The sporocyst residuum contains small granules uniformly distributed in the middle of the sporocyst. The prevalence of E. curvata n. sp. was 17.4% and 12.8% in C. talpacoti and S. squammata, respectively.9553-
From Popular to Unpopular Education? The Open-Air School(s) of ‘Pont-Rouge’, Roubaix (1921-1978)
Broken symmetry of row switching in 2D Josephson junction arrays
We present an experimental and theoretical study of row switching in
two-dimensional Josephson junction arrays. We have observed novel dynamic
states with peculiar percolative patterns of the voltage drop inside the
arrays. These states were directly visualized using laser scanning microscopy
and manifested by fine branching in the current-voltage characteristics of the
arrays. Numerical simulations show that such percolative patterns have an
intrinsic origin and occur independently of positional disorder. We argue that
the appearance of these dynamic states is due to the presence of various
metastable superconducting states in arrays.Comment: 4 Pages, 6 Figure
Comparison of attraction patterns of Hermetia illucens (Diptera, Stratiomyidae) associated to buried Rattus norvergicus carcasses with steroid hormones treatment
Hermetia illucens (L.) (Diptera, Stratiomyidae) é uma espécie abundante em todo o continente americano. No entanto, ainda há poucos estudos no Brasil abordando aspectos em relação a sua biologia e ecologia, em particular associados a estudos forenses. Neste trabalho, nós observamos os efeitos de hormônios esteróides na decomposição corporal de Rattus norvergicus, variedade Wistar enterrados na atração de H. illucens. Além da presença de diversas espécies de larvas e adultos de insetos freqüentemente encontrados em carcaças nessas condições, observou-se uma grande quantidade de imaturos de H. illucens. Essa espécie representou aproximadamente 22% de todos os espécimes coletados, tendo aparecido somente nos animais que receberam tratamento com esteróides sexuais dos tipos testosterona, progesterona e estradiol. Dentre esses, a maior abundância foi verificada nos que haviam recebido testosterona (68%). A presença de imaturos de H. illucens, apenas nos animais que receberam o tratamento com esteróides, em experimentos realizados em dois anos consecutivos revela uma possível atração/seleção dessa espécie por corpos com quantidades aumentadas de hormônios sexuais. Esse comportamento pode ser particularmente útil para a entomologia forense no que diz respeito à estimativa do intervalo pós-morte (IPM), particularmente quando tem como base informações sobre o ciclo de vida e ecologia de insetos necrófagos.Hermetia illucens (L.) (Diptera, Stratiomyidae) is an abundant species in the entire American continent. Nevertheless, there are few studies in Brazil dealing with aspects of its biology and ecology, particularly associated with forensic studies. In this study we intended to observe the effects of steroids hormones in the corporal decomposition of buried Rattus norvergicus from the Wistar variety in the attraction of H. illucens. Besides the presence of several insect species commonly found in carcasses, a great amount of immature H. illucens was observed. This species represented approximately 22% of all collected specimens and it was only found in the animals that have received treatment with sexual steroids, such as testosterone, progesterone and estradiol. Among the animals under treatment, the greater abundance was verified in those who had received testosterone (68%). The presence of immatures of H. illucens only in the animals that received hormone treatments in experiments accomplished in two consecutive years strongly suggests a possible attraction of this species for bodies with different amounts of sexual hormones. This behavior can also be relevant for the forensic entomology in regard to the post-mortem interval (PMI) estimation, particularly when the PMI is based on information about the necrophagous insect's life cycle and ecology
Model for the fine structure of zero field steps in long Josephson tunnel junctions and its comparison with experiment
Simulation of the CMS Resistive Plate Chambers
The Resistive Plate Chamber (RPC) muon subsystem contributes significantly to
the formation of the trigger decision and reconstruction of the muon trajectory
parameters. Simulation of the RPC response is a crucial part of the entire CMS
Monte Carlo software and directly influences the final physical results. An
algorithm based on the parametrization of RPC efficiency, noise, cluster size
and timing for every strip has been developed. Experimental data obtained from
cosmic and proton-proton collisions at TeV have been used for
determination of the parameters. A dedicated validation procedure has been
developed. A good agreement between the simulated and experimental data has
been achieved.Comment: to be published in JINS
In-plane fluxon in layered superconductors with arbitrary number of layers
I derive an approximate analytic solution for the in-plane vortex (fluxon) in
layered superconductors and stacked Josephson junctions (SJJ's) with arbitrary
number of layers. The validity of the solution is verified by numerical
simulation. It is shown that in SJJ's with large number of thin layers,
phase/current and magnetic field of the fluxon are decoupled from each other.
The variation of phase/current is confined within the Josephson penetration
depth, , along the layers, while magnetic field decays at the
effective London penetration depth, . For comparison
with real high- superconducting samples, large scale numerical simulations
with up to 600 SJJ's and with in-plane length up to 4000 %, are
presented. It is shown, that the most striking feature of the fluxon is a
Josephson core, manifesting itself as a sharp peak in magnetic induction at the
fluxon center.Comment: 4 pages, 4 figures. Was presented in part at the First Euroconference
on Vortex Matter in Superconductors (Crete, September 1999
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Measurement of jet multiplicity distributions in [Formula: see text] production in pp collisions at [Formula: see text].
The normalised differential top quark-antiquark production cross section is measured as a function of the jet multiplicity in proton-proton collisions at a centre-of-mass energy of 7[Formula: see text] at the LHC with the CMS detector. The measurement is performed in both the dilepton and lepton+jets decay channels using data corresponding to an integrated luminosity of 5.0[Formula: see text]. Using a procedure to associate jets to decay products of the top quarks, the differential cross section of the [Formula: see text] production is determined as a function of the additional jet multiplicity in the lepton+jets channel. Furthermore, the fraction of events with no additional jets is measured in the dilepton channel, as a function of the threshold on the jet transverse momentum. The measurements are compared with predictions from perturbative quantum chromodynamics and no significant deviations are observed
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Measurement of WZ and ZZ production in pp collisions at [Formula: see text] in final states with b-tagged jets.
Measurements are reported of the WZ and ZZ production cross sections in proton-proton collisions at [Formula: see text][Formula: see text] in final states where one Z boson decays to b-tagged jets. The other gauge boson, either W or Z, is detected through its leptonic decay (either [Formula: see text], [Formula: see text] or [Formula: see text], [Formula: see text], or [Formula: see text]). The results are based on data corresponding to an integrated luminosity of 18.9 fb[Formula: see text] collected with the CMS detector at the Large Hadron Collider. The measured cross sections, [Formula: see text] and [Formula: see text], are consistent with next-to-leading order quantum chromodynamics calculations
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