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Search Results: 1 - 10 of 210120 matches for " Rodrigo P. P.;Turco "
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Lutzomyia longipalpis (Diptera: Psychodidae: Phlebotominae): a review
Soares, Rodrigo P. P.;Turco, Salvatore J.;
Anais da Academia Brasileira de Ciências , 2003, DOI: 10.1590/S0001-37652003000300005
Abstract: lutzomyia longipalpis is the most important vector of americanvisceral leishmaniasis (avl) due to leishmania chagasi in the new world. despite its importance, avl, a disease primarily of rural areas, has increased its prevalence and became urbanized in some large cities in brazil and other countries in latin america. although the disease is treatable, other control measures include elimination of infected dogs and the use of insecticides to kill the sand flies. a better understanding of vector biology could also account as one more tool for avl control. a wide variety of papers about l. longipalpis have been published in the recent past years. this review summarizes our current information of this particular sand fly regarding its importance, biology, morphology, pheromones genetics, saliva, gut physiology and parasite interactions.
Lutzomyia longipalpis (Diptera: Psychodidae: Phlebotominae): a review
Soares Rodrigo P. P.,Turco Salvatore J.
Anais da Academia Brasileira de Ciências , 2003,
Abstract: Lutzomyia longipalpis is the most important vector of AmericanVisceral Leishmaniasis (AVL) due to Leishmania chagasi in the New World. Despite its importance, AVL, a disease primarily of rural areas, has increased its prevalence and became urbanized in some large cities in Brazil and other countries in Latin America. Although the disease is treatable, other control measures include elimination of infected dogs and the use of insecticides to kill the sand flies. A better understanding of vector biology could also account as one more tool for AVL control. A wide variety of papers about L. longipalpis have been published in the recent past years. This review summarizes our current information of this particular sand fly regarding its importance, biology, morphology, pheromones genetics, saliva, gut physiology and parasite interactions.
Erratum to ''Lutzomyia longipalpis (Diptera: Psychodidae: Phlebotominae): a review''
Soares Rodrigo P.P.,Turco Salvatore J.
Anais da Academia Brasileira de Ciências , 2003,
Differential Midgut Attachment of Leishmania (Viannia) braziliensis in the Sand Flies Lutzomyia (Nyssomyia) whitmani and Lutzomyia (Nyssomyia) intermedia
Rodrigo P. Soares,Carina Margonari,Nágila C. Secundino,Maria E. Macêdo,Simone M. da Costa,Elizabeth F. Rangel,Paulo F. Pimenta,Salvatore J. Turco
Journal of Biomedicine and Biotechnology , 2010, DOI: 10.1155/2010/439174
Abstract: The interaction between Leishmania and sand flies has been demonstrated in many Old and New World species. Besides the morphological differentiation from procyclic to infective metacyclic promastigotes, the parasite undergoes biochemical transformations in its major surface lipophosphoglycan (LPG). An upregulation of -glucose residues was previously shown in the LPG repeat units from procyclic to metacyclic phase in Leishmania (Viannia) braziliensis, which has not been reported in any Leishmania species. LPG has been implicated as an adhesion molecule that mediates the interaction with the midgut epithelium of the sand fly in the Subgenus Leishmania. These adaptations were explored for the first time in a species from the Subgenus Viannia, L. (V.) braziliensis with its natural vectors Lutzomyia (Nyssomyia) intermedia and Lutzomyia (Nyssomyia) whitmani. Using two in vitro binding techniques, phosphoglycans (PGs) derived from procyclic and metacyclic parasites were able to bind to the insect midgut and inhibit L. braziliensis attachment. Interestingly, L. braziliensis procyclic parasite attachment was ~11-fold greater in the midgut of L. whitmani than in L. intermedia. The epidemiological relevance of L. whitmani as a vector of American Cutaneous Leishmaniasis (ACL) in Brazil is discussed.
The size-dependent charge fraction of sub-3-nm particles as a key diagnostic of competitive nucleation mechanisms under atmospheric conditions
F. Yu,R. P. Turco
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2011,
Abstract: A clear physical understanding of atmospheric particle nucleation mechanisms is critical in assessing the influences of aerosols on climate and climate variability. Currently, several mechanisms have been proposed and are being employed to interpret field observations of nucleation events. Roughly speaking, the two most likely candidates are neutral cluster nucleation (NCN) and ion-mediated nucleation (IMN). Detailed nucleation event data has been obtained in boreal forests. In one set of analyses of these measurements, NCN was suggested as the dominant formation mode, while in another, it was IMN. Information on the electrical charge distribution carried by the nucleating clusters is one key for identifying the relative contributions of neutral and ion-mediated processes under various conditions. Fortunately, ground-breaking measurements of the charged states or fractions of ambient nanometer-sized particles soon after undergoing nucleation are now available to help resolve the main pathways. In the present study, the size-dependent "apparent" formation rates and fractions of charged and neutral particles in a boreal forest setting are simulated with a detailed kinetic model. We show that the predicted "apparent" formation rates of charged and neutral particles at 2 nm for eight representative case study days agree well with the corresponding values based on observations. In the simulations, the "apparent" contribution of ion-based nucleation increases by up to ~one order of magnitude as the size of "sampled" particles is decreased from 2 nm to ~1.5 nm. These results suggest that most of the neutral particles sampled in the field at sizes around 2 nm are in reality initially formed on ionic cores that are neutralized before the particles grow to this size. Thus, although the apparent rate of formation of neutral 2-nm particles might seem to be dominated by a neutral clustering process, in fact those particles may be largely the result of an ion-induced nucleation mechanism. This point is clarified when the formation rates of smaller particles (e.g., ~1.5 nm) are explicitly analyzed (noting that measurements at these smaller sizes are not yet available), indicating that IMN dominates NCN processes under typical circumstances in the boreal forest cases investigated.
Compara??o de três métodos de estimativa da evapotranspira??o de referência para a regi?o de Araraquara - SP
Vescove, Humberto V.;Turco, José E. P.;
Engenharia Agrícola , 2005, DOI: 10.1590/S0100-69162005000300017
Abstract: to verify the efficiency of the evapotranspiration reference methods (eto), it is necessary to contrast with the standard method. this work has the purpose to compare three methods of eto estimation: solar radiation (rs), makkink (mak) and a class a tank (tca) method with penman-monteith method (pm), in two phases of citrus growth, working with biweekly medium data for the winter-spring and summer-autumn periods. the research was developed in a citrus farm, in araraquara - sp, brazil, where it was installed an automated meteorological station and a class a tank. through a system of data acquisition, measures of the global solar radiation, radiation balance, temperature of the air, relative humidity of the air and speed of the wind, were obtained. the linear regression analysis shows that the tca method can be fitted by, y = bx, where y represents etopm and x represents etotca. for the others analyzed methods we found the model y = bx + a. the results of this study indicate that the tca method overestimated eto 26% in the summer-autumn period and 24% in the winter-spring period. the mak method, underestimated eto in the two analyzed periods, while the rs method overestimated eto.
Avalia??o de modelo matemático para estimar a radia??o solar incidente sobre superfícies com diferentes exposi??es e declividades
Turco, José E. P.;Rizzatti, Gilcileia S.;
Engenharia Agrícola , 2006, DOI: 10.1590/S0100-69162006000100028
Abstract: this research evaluated a model used for estimating income solar radiation in surfaces with different expositions and declivities. the research was developed in one structure denominated "experimental hidrografic basin" of the rural engineering department - unesp, sao paulo state university, brazil. in this structure was utilized surfaces characterized as h, 10n, 10s, 20n, 20s, 10e, 10w, 20e and 20w. the sensor used for obtaining income solar radiation in surfaces was a kipp & zonnen piranometer model cm3. the methodology of kondratyev was used to calculate the income solar radiation on surfaces. evaluation of the results were made for the daily period using regression analyze and considering the linear model (y = ax + b), which the dependent variable was the global radiation measured (kˉm) and the global radiation calculated (kˉc) was the independent variable. the model showed good results to estimate the radiation on the surfaces h, 10n, 10s, 10e, 10w, 20e e 20w. using data of sunny days were obtained the following results: in the winter, the model was exact to estimate the solar radiation on the surface 20n, and it showed acceptable results to estimate the solar radiation on the surface 20s.
An empirical approach to the nucleation of sulfuric acid droplets in the atmosphere
P. Hamill,R. D'Auria,P. R. Turco
Annals of Geophysics , 2003, DOI: 10.4401/ag-3406
Abstract: We use quantum mechanical evaluations of the Gibbs free energy of the hydrates of sulfuric acid, H2SO4. nH2O and (H2SO4)2 . nH2O to evaluate an empirical surface tension for sulfuric acid-water clusters containing few molecules. We use this surface tension to evaluate nucleation rates using classical heteromolecular theory. At low temperatures (T 213 K) the nucleation rates obtained with the empirical surface tensions are signifi cantly greater than those using bulk values of the surface tension. At higher temperatures the difference disappears.
Artificial Neural Network Model for Predicting Lung Cancer Survival  [PDF]
Hansapani Rodrigo, Chris P. Tsokos
Journal of Data Analysis and Information Processing (JDAIP) , 2017, DOI: 10.4236/jdaip.2017.51003
Abstract: The object of our present study is to develop a piecewise constant hazard model by using an Artificial Neural Network (ANN) to capture the complex shapes of the hazard functions, which cannot be achieved with conventional survival analysis models like Cox proportional hazard. We propose a more convenient approach to the PEANN created by Fornili et al. to handle a large amount of data. In particular, it provides much better prediction accuracies over both the Poisson regression and generalized estimating equations. This has been demonstrated with lung cancer patient data taken from the Surveillance, Epidemiology and End Results (SEER) program. The quality of the proposed model is evaluated by using several error measurement criteria.
Atmospheric effects and societal consequences of regional scale nuclear conflicts and acts of individual nuclear terrorism
O. B. Toon,R. P. Turco,A. Robock,C. Bardeen
Atmospheric Chemistry and Physics Discussions , 2006,
Abstract: We assess the potential damage and smoke production associated with the detonation of small nuclear weapons in modern megacities. While the number of nuclear warheads in the world has fallen by about a factor of three since its peak in 1986, the number of nuclear weapons states is increasing and the potential exists for numerous regional nuclear arms races. Eight countries are known to have nuclear weapons, 2 are constructing them, and an additional 32 nations already have the fissile material needed to build substantial arsenals of low-yield (Hiroshima-sized) explosives. Population and economic activity worldwide are congregated to an increasing extent in megacities, which might be targeted in a nuclear conflict. Our analysis shows that, per kiloton of yield, low yield weapons can produce 100 times as many fatalities and 100 times as much smoke from fires as high-yield weapons, if they are targeted at city centers. A single "small'' nuclear detonation in an urban center could lead to more fatalities, in some cases by orders of magnitude, than have occurred in the major historical conflicts of many countries. We analyze the likely outcome of a regional nuclear exchange involving 100 15-kt explosions (less than 0.1% of the explosive yield of the current global nuclear arsenal). We find that such an exchange could produce direct fatalities comparable to all of those worldwide in World War II, or to those once estimated for a "counterforce'' nuclear war between the superpowers. Megacities exposed to atmospheric fallout of long-lived radionuclides would likely be abandoned indefinitely, with severe national and international implications. Our analysis shows that smoke from urban firestorms in a regional war would rise into the upper troposphere due to pyro-convection. Robock et al. (2006) show that the smoke would subsequently rise deep into the stratosphere due to atmospheric heating, and then might induce significant climatic anomalies on global scales.We also anticipate substantial perturbations of global ozone. While there are many uncertainties in the predictions we make here, the principal unknowns are the type and scale of conflict that might occur. The scope and severity of the hazards identified pose a significant threat to the global community. They deserve careful analysis by governments worldwide advised by a broad section of the world scientific community, as well as widespread public debate.
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