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Search Results: 1 - 10 of 50668 matches for " Antonio Luiz;Carlesso "
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Sele??o de progênies de meio-irm?os de milho para eficiência no uso de nitrogênio
Heinz, Rafael;Mota, Leandro Henrique de Sousa;Gon?alves, Manoel Carlos;Viegas Neto, Antonio Luiz;Carlesso, André;
Revista Ciência Agron?mica , 2012, DOI: 10.1590/S1806-66902012000400015
Abstract: the study aimed to estimate the parameters and the genetic gain in selection of half-sib for nitrogen use efficiency, through simultaneous selection of characters. two experiments were established, differentiated by nitrogen fertilization, one with proper fertilization (high n) and another in stress conditions (low n). the experiment was using a 10x10 lattice with two replications. in the tests we used 84 different half-sib and 16 witnesses. from the mean squares of analysis of variance in each environment were the estimates of genetic parameters. after the analysis were selected in each environment 17 different half-brothers, through the classical index selection, and verified the repeatability of the progeny in both environments. observed variability among progenies, determining the potential for population screening for nitrogen use efficiency. the parameter estimates and genetic gains were higher in high n the use of selection index promoted estimates of selection gain of 24.43 and 21.05% for high and low n, respectively, for grain yield. the progenies showed average yield of 13.45 and 19.47% higher than control in high and low n, respectively.
Consumo de água e perdas de nutrientes e de sedimentos na água de drenagem inicial do arroz irrigado
Machado Sérgio Luiz de Oliveira,Marchezan Enio,Righes Afranio Almir,Carlesso Reimar
Ciência Rural , 2006,
Abstract: No Rio Grande do Sul (Brasil), a lavoura arrozeira é grande consumidora de água e apresenta potencial de contamina o de mananciais hídricos quando a drenagem inicial é realizada. Este trabalho teve como objetivo quantificar o consumo de água do arroz irrigado submetido a sistemas de cultivo (Experimento I) bem como verificar a concentra o de nutrientes e de sedimentos em suspens o na água de drenagem inicial no pré-germinado, mix de pré-germinado e transplante de mudas (Experimento II). Os experimentos foram conduzidos em 2000/01 e 2001/02 (Experimento I) e 1999/00, 2000/01 e 2001/02 (Experimento II) em área de várzea em Planossolo Hidromórfico Eutrófico, arênico na Universidade Federal de Santa Maria (UFSM), Santa Maria (RS). No experimento I, o consumo de água no sistema convencional, cultivo mínimo, pré-germinado, mix de pré-germinado e transplante de mudas foi analisado no delineamento experimental em blocos ao acaso, com quatro repeti es. O consumo de água n o foi afetado pelos sistemas de cultivo variando de 5.431 a 6.422 e de 5.374 a 5.852m3 ha-1, respectivamente para 2000/01 e 2001/02. A quantidade de água necessária para o preparo inicial do solo no pré-germinado e transplante de mudas ou para a forma o da lamina d?água no mix de pré-germinado foi de 1.285m3 ha-1. No experimento II, os três anos agrícolas (1999/00, 2000/01 e 2001/02) com os três sistemas de cultivo (pré-germinado, mix de pré-germinado e transplante de mudas) foram comparados para quantificar as perdas de nutrientes e de sedimentos na água de drenagem inicial. As concentra es de nitrato, fósforo e magnésio na água foram similares entre os sistemas de cultivo. No mix de pré-germinado, a concentra o de am nio e potássio foram maiores que no pré-germinado e transplante de mudas, com 3,85 e 7,70mg L-1 respectivamente. Contudo as perdas de nutrientes verificadas estiveram dentro de limites aceitáveis de acordo com a legisla o vigente. A turbidez e a presen a de sedimentos na água de drenagem inicial foi menor no mix de pré-germinado em compara o com o pré-germinado e transplante de mudas, indicando que a manuten o da água na lavoura nestes sistemas de cultivo é importante para sustentabilidade do ecossistema arroz irrigado e manuten o do potencial produtivo da cultura.
Chest wall mechanics during pressure support ventilation
Andrea Aliverti, Eleonora Carlesso, Raffaele Dellacà, Paolo Pelosi, Davide Chiumello, Antonio Pedotti, Luciano Gattinoni
Critical Care , 2006, DOI: 10.1186/cc4867
Abstract: In nine patients four different levels of PSV (5, 10, 15 and 25 cmH2O) were randomly applied with the same level of positive end-expiratory pressure (10 cmH2O). Flow, airway opening, and oesophageal and gastric pressures were measured, and volume variations for the entire chest wall, the ribcage and abdominal compartments were recorded by opto-electronic plethysmography. The pressure and the work generated by the diaphragm, rib cage and abdominal muscles were determined using dynamic pressure-volume loops in the various phases of each respiratory cycle: pre-triggering, post-triggering with the patient's effort combining with the action of the ventilator, pressurization and expiration. The complete breathing pattern was measured and correlated with chest wall kinematics and dynamics.At the various levels of pressure support applied, minute ventilation was constant, with large variations in breathing frequency/ tidal volume ratio. At pressure support levels below 15 cmH2O the following increased: the pressure developed by the inspiratory muscles, the contribution of the rib cage compartment to the total tidal volume, the phase shift between rib cage and abdominal compartments, the post-inspiratory action of the inspiratory rib cage muscles, and the expiratory muscle activity.During PSV, the ventilatory pattern is very different at different levels of pressure support; in patients with acute lung injury pressure support greater than 10 cmH2O permits homogeneous recruitment of respiratory muscles, with resulting synchronous thoraco-abdominal expansion.In intensive care pressure support ventilation (PSV), a form of assisted mechanical ventilation, is among the modes most commonly employed to decrease the patient's work of breathing without neuromuscular blockade [1]. It is known that for optimal unloading of the respiratory muscles, the ventilator should cycle in synchrony with the activity of the patient's respiratory rhythm. Patient-ventilator asynchrony frequently occ
Absor??o de água pelas plantas: água disponível versus extraível e a produtividade das culturas
Carlesso, Reimar;
Ciência Rural , 1995, DOI: 10.1590/S0103-84781995000100035
Abstract: an important issue to understanding the effect of water shortage on crop yield is how crops balance the supply of water from the soil to match the demand for water from the atmosphere. supply is determined by the crop ability to utilise the stored soil water and, demand, on the other hand, is determined by a combination of metereological factors interacting with the crop canopy. different criteria have been used to determine the timing and duration of water deficits despite the abundant literature available. much attention has been given to the quantification of crop water consumption in different stages of development. however, considerations about the total amount of plant water available (extractable) in the soil profile to affect plant growth and development have recieved little attention. a discussion of water extraction must first consider the problem of accurately defining the limits to soil water availability. this review presents a critical analysis of the limitations usually encountered in using the limits concept of soil water availability. the relationship between water available and extractable is analysed based on results of transpiration rates and fraction of available water, depth of water extraction and, extraction per unit soil depth.
Consumo de água e perdas de nutrientes e de sedimentos na água de drenagem inicial do arroz irrigado
Machado, Sérgio Luiz de Oliveira;Marchezan, Enio;Righes, Afranio Almir;Carlesso, Reimar;Villa, Silvio Carlos Cazarrotto;Camargo, Edinalvo Rabaiolli;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000100010
Abstract: in rio grande do sul, brazil, irrigated rice fields use large amount of water and have the potential of contaminate surface water bodies when drainage is performed. the objective of this experiment was to quantify the amount of water in flooded rice fields under different cropping systems (experiment i) and to measure the concentration of nutrients in the initial drainage water of pre-germinated, pre-germinated mix and seedling transplanting systems (experiment ii). the research was conducted during 2000/01 and 2001/02 (experiment i) and during 1999/00, 2000/01 and 2001/02 (experiment ii) in a lowland area of a planosoil located at the federal university of santa maria-rs, brazil. in the years 2000/01 and 2001/02 (experiment i) five cropping systems (conventional, minimum tillage, pre-germinated, mix of pre-germinated and seedling transplanting) randomized block experimental design with four replications were used. the cropping systems did not influence the use of water by flooded rice, varying from 5,431 to 6,422 and 5,347 to 5,852m3 ha-1 for the years 2000/01 and 2001/02, respectively. the amount of water used for flooding the soil in the pre-germinated and seedling transplanting systems or form stablishing a layer of water in the mix pre-germinated was 1,285m3 ha-1. in experiment ii, three cropping systems (pre-germinated, mix of pre-germinated and seedling transplanting) were compared. nitrate, phosphorus and magnesium concentrations in the initial drainage water were similar in the different cropping systems. in the mix of pre-germinated system, ammonium and potassium concentrations were higher when compared with the pre-germinated and seedling transplanting systems with averages of 3.85 and 7.70mg l-1, respectively. recorded nutrient losses were within the range allowed by the currente legislation. the concentration of sediments in the drainage water was lower in the mix of pre-germinated system when compared to pre-germinated and seedling transplanting system
As febres paulistas na Sociedade de Medicina e Cirurgia de S?o Paulo: uma controvérsia entre porta-vozes de diferentes saberes
Teixeira, Luiz Antonio;
História, Ciências, Saúde-Manguinhos , 2004, DOI: 10.1590/S0104-59702004000400003
Abstract: at the close of the nineteenth century, s?o paulo physicians were debating a disease they classified as "febres paulistas" (s?o paulo fevers). the article presents a brief overview of the role of fevers within brazilian nosology at that time and describes how science then explained febres paulistas, malaria, and typhoid fever. changes in the medical field meant febres paulistas were no longer classified as forms of malaria but instead considered cases of typhoid fever. following the society's debates surrounding this shift, the article analyzes the scientific lines that tended to identify febres paulistas with malaria or typhoid fever and also the line that believed these fevers were an independent nosological entity.
Alastrim, varíola é?
Teixeira, Luiz Antonio;
História, Ciências, Saúde-Manguinhos , 2000, DOI: 10.1590/S0104-59702000000200003
Abstract: between 1910 and 1913, two renowned physicians in the city of s?o paulo found themselves engaged in a scientific controversy regarding the classification of a disease then assailing the state. antonio carini, director of the instituto pasteur de s?o paulo, believed the illness to be small pox, while emílio ribas, director of the servi?o sanitário, claimed it was allastrim, or milk pox. the controversy started in the sociedade de medicina e cirurgia but later migrated to other forums and came to incorporate other figures as well. this presentation and discussion of the polemic is meant as a contribution to our understanding of the process by which a scientific consensus is constructed and solidified within the field of the biomedical sciences.
O controle do cancer no Brasil na primeira metade do século XX
Teixeira, Luiz Antonio;
História, Ciências, Saúde-Manguinhos , 2010, DOI: 10.1590/S0104-59702010000500002
Abstract: the article discusses public efforts to control cancer in brazil from the 1920s to the close of the 1940s. it examines the process which brought about creation of the inspectorship to combat leprosy, venereal diseases, and cancer within the national department of public health. creation of the inspectorship was the first public action to target cancer and, while it was not far-reaching, its emergence enables us to understand the professional field of cancer at that time. the text also points to the role played by the diffusion of electrosurgery in expanding medical interest about cancer and in the founding of the cancerology center in the federal district. it discusses the establishment and first decade of activities of the national cancer service, endeavoring to link the service's initial profile with the issues that guided its history.
Da ra?a à doen?a em Casa-grande e senzala
Teixeira, Luiz Antonio;
História, Ciências, Saúde-Manguinhos , 1997, DOI: 10.1590/S0104-59701997000200003
Abstract: the article analyzes how gilberto freyre addresses health-related issues in his book master and slave. the first point of focus is how the sanitation movement that emerged in the sert?o region in the late 1910s influenced freyre's essay. the article next endeavors to understand the relation between freyre's emphasis on the problem of syphilis in brazil and the issues of race and miscegenation, both of which are constants in his works. lastly, the article endeavors to situate freyre's ideas within the ideological framework of eugenics that was in fashion in brazil at the time his works were written.
Cibercultura e literatura: hipertexto e as novas arquiteturas textuais
Diniz, Luiz Antonio Garcia;
Alea : Estudos Neolatinos , 2005, DOI: 10.1590/S1517-106X2005000200003
Abstract: the object of this study is to analyse the implications of the new technologies in the perceivable (reader) and technical (author) forms of textual production. cyberculture, the result of the trivialisation of personal computers and of the new relationships created by virtual communities in an environment characterised by interactivity, has imposed a new paradigm. our focus is the relationships established between literature, cyberculture and the cybercity by the newly emerging textual forms. what is the role of the book in cyberspace and in immersive environments? how would temporality be defined in the contemporary text, characterized by a growing fractality? if hypertext is characterised as something opposed to linear text, how may we define hypertext in relation to printed text, a product characterised by the notion of the author and individuality?
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