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Search Results: 1 - 10 of 546121 matches for " L. M. Moreira "
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Inaugural Editorial: Genomics and Quantitative Genetics, a new journal
H. L. M. Moreira
Genomics and Quantitative Genetics , 2010,
Abstract: A brief account for the motivation behind this new journal is stated. The aims and scope of the journal, as well as its intended reach are established. Collaborative work that is inclusive is set as a core value for Genomics and Quantitative Genetics.
On the Use of Laser Ablation for Cleaning High Voltage Ceramic Insulators  [PDF]
E. de Posada, L. Moreira, M. Arronte, L. Ponce, T. Flores
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2014, DOI: 10.4236/jsemat.2014.45029
Abstract:

High voltage lines are one of the main ways for carrying electric energy. To do so high voltage insulators are needed to insulate these lines from the supporting towers. Glass, ceramic and polymer insulators are widely used. Generally high voltage insulators are exposed to weather where humidity, from rain and moist, together with pollution allows accumulation of unwanted material on the surface of the insulator. Cleaning procedures are then needed to remove such material and avoid short-circuiting. The most commonly used cleaning methods are hand cleaning using chemicals that need turning off the main and water jet, which allows keeping the line in service. In this work we explore the possibility of using laser ablation for cleaning high voltage ceramic insulators. It is demonstrated that cleaning can be accomplished by a two-step process. First a Q-switched Nd: YAG laser is used to ablate the unwanted material. The second step is to use a free running Nd: YAG laser to restore the surface hydrophobicity of ceramic insulator, which is affected in the first process step.

Evaluation of genotoxicity using the micronucleus assay and nuclear abnormalities in the tropical sea fish Bathygobius soporator (Valenciennes, 1837) (Teleostei, Gobiidae)
Galindo, Toni P.;Moreira, Lília M.;
Genetics and Molecular Biology , 2009, DOI: 10.1590/S1415-47572009000200029
Abstract: the micronucleus and nuclear abnormalities assays have been used increasingly to evaluate genotoxicity of many compounds in polluted aquatic ecossystems. the aim of this study is to verify the efficiency of the micronucleus assay and nuclear abnormality assay in field and laboratory work, when using erythrocytes of the tropical marine fish bathygobius soporator as genotoxicity biomarkers. gill peripheral blood samples were obtained from specimens of bathygobius soporator. in order to investigate the frequencies of micronuclei and to assess the sensitivity of species, the results were compared with samples taken at the reference site and maintained in the laboratory, and fish treated with cyclophosphamide. the micronucleus assay was efficient in demonstrating field pollution and reproducing results in the labotatory. there were significant higher frequencies of micronuclei in two sites subject to discharge of urban and industrial effluents. the nuclear abnormality assay did not appear to be an efficient tool for genotoxicity evaluation when compared with field samples taken at a reference site in laboratory, with a positive control.
Avalia??o dos fatores associados ao estado nutricional na idade corrigida de termo em recém-nascidos de muito baixo peso
Gianini, Nicole M.;Vieira, Alan A.;Moreira, Maria E. L.;
Jornal de Pediatria , 2005, DOI: 10.2223/1280
Abstract: objective: to evaluate the nutritional status at term of a cohort of newborn babies with birth weights of less than 1,500 g and to correlate this with nutritional practices and clinical variables. methods: very low birth weight infants admitted to eight neonatal intensive care units from november 1999 to april 2000 were studied prospectively. the units were defined as type i if they employed aggressive nutritional support techniques and type ii if other nutritional practices were used. babies' were defined as malnourished if their z-score for weight was less than or equal to -2 on the canadian perinatal surveillance system growth curves. data was analyzed using multivariate linear regression and logistic regression. the study was approved by the committee for ethics in research. results: sixty-three percent (126/200) of the study population were classed as being malnourished at term. weight at term (corrected gestational age) showed a direct correlation with birth weight, but an indirect correlation with the length of stay, gestational age at birth, time to regain birth weight and crib score (p < 0.05). small for gestational age infants had a 12.19 times greater chance of being malnourished at term. being born at a type i unit reduced the risk of malnutrition at term by 2.17 times, male sex reduced this risk by 0.4 times and achieving total enteral nutrition by the 10th day of life reduced it by 1.97 times (p < 0.03). conclusions: the most effective means of preventing babies being born malnourished is by encouraging perinatal practices aimed at preventing restricted intrauterine growth, in addition to giving priority to aggressive nutritional management.
Proficiency Test on Ftir Wine Analysis
Moreira,J. L.; Marcos,A. M.; Barros,P.;
Ciência e Técnica Vitivinícola , 2002,
Abstract: the ftir (fourier transform infrared) technology has recently become one of the greatest improvements in the routine work of a wine analysis laboratory. in portugal a workgroup of laboratories equipped with ftir wine analysers has been created in order to optimise this methodology. one of the most important tasks of this workgroup was to carry out a proficiency test for ftir analysers. this test consisted in the analysis of the same sample by all the participants, using a ftir wine analyser provided with the same analytical calibration and using the same procedure. the results obtained presented good reproducibility in what the most relevant parameters are concerned. this proficiency test enables a more effective quality control of the ftir results of each laboratory and became an important tool to detect several malfunctions in the equipments of the participants.
Analysis of Portuguese Wines by Fourier Transform Infrared Spectrometry (Ftir)
Moreira,J. L.; Marcos,A. M.; Barros,P.;
Ciência e Técnica Vitivinícola , 2002,
Abstract: the aim of this work is to present the results of the experimental optimisation of the essays with ftir, supported by analytical data obtained by the methods that the laboratory routinely applies. the use of ftir in enology -an emergent and very promising methodology -must be based on specific analytical calibrations established through the quantification by usual physical and chemical methods of the parameters to analyse. the global calibration obtained for the analysis of wines allows good results for all parameters. the specific calibration performed leads, in the case of the total sugars, to more adjusted results to the values given by the analytical methods in routine, being the use of a general or specific calibration indifferent for the remaining studied parameters
Química da precipita??o atmosférica na cidade de Campo Grande - MS
Moreira-Nordemann, L. M.;Girard, P.;Poppi, N. Ré;
Revista Brasileira de Geofísica , 1997, DOI: 10.1590/S0102-261X1997000100004
Abstract: rainwater and aerosol samples were collected for a period of two years in the city of campo grande (cg), in the mato grosso do sul state located in the cerrado ecosystem. the concentrations of na+, ca2+, k+, mg2+, cl-, so42-, no3- and nh4+, were determined along with the ph of rainwater. making use of these results, we inferred the dry and wet ionic deposition for the region. we suggest a new method to evaluate the dry deposition using results from bulk rainwater samples (dry + wet deposition) and wet only samples. these results were compared to the deposition estimated by aerosol sampling. also the deposition in cg was compared to the deposition in other brazilian cities that were previously studied. even if there is no industries in cg where the principal sources of pollution are vehicle traffic (a permanent source) and biomass burning (seasonal activity), it can be observed that the wet deposition of various ionic species, in particular nitrogenous species, are equivalent to those obtained for industrialized and more populated cities. the cg results show that biomass burning is responsible for high k+, no3-, nh4+ e so42- emissions. the regional charcoal factories are the responsible for the high cl- emissions.
El aparato masticador del género extinto Actenomys Burmeister, 1888 (Rodentia, Ctenomyidae): inferencias sobre su modo de vida
de Santis, L. J. M.,Moreira, G. J.
Estudios Geologicos , 2000, DOI: 10.3989/egeol.00561-2156
Abstract: The genus Actenomys is registered from Plioceno sediments of Buenos Aires province, Argentina. Anatomy of skull and dentition of the genus is described, giving special emphasis to the origin and insertion points of the masticatory musculature. Actenomys is compared with the extant fossorial rodent of the genus Ctenomys, and the development of the masticatory muscles and their degree of functionality are inferred. It is concluded that Actenomys presents a less robust skull, with a masticatory musculature in agreement and incisives with great procumbency. This evidence could explain a possible adaptation of Actenomys to dig using the incisives and an adaptation to live in habitats of higher humidity than the extant forms. Se describe la anatomía cráneo-dentaria del género Actenomys, registrado en sedimentos del Plioceno de la provincia de Buenos Aires (República Argentina), con especial énfasis los puntos de origen e inserción de la musculatura masticatoria; se lo compara con el roedor fosorial viviente del género Ctenomys, infiriéndose el desarrollo de los músculos masticatorios y su grado de funcionalidad. Se concluye que Actenomys presenta un cráneo menos robusto, con una musculatura masticatoria acorde e incisivos procumbentes, lo que podría explicar una posible adaptación para cavar con los mismos, y que estaría adaptado a vivir en ambientes con un porcentaje de humedad mayor que las formas actuales.
Evolution of circadian organization in vertebrates
Menaker M.,Moreira L.F.,Tosini G.
Brazilian Journal of Medical and Biological Research , 1997,
Abstract: Circadian organization means the way in which the entire circadian system above the cellular level is put together physically and the principles and rules that determine the interactions among its component parts which produce overt rhythms of physiology and behavior. Understanding this organization and its evolution is of practical importance as well as of basic interest. The first major problem that we face is the difficulty of making sense of the apparently great diversity that we observe in circadian organization of diverse vertebrates. Some of this diversity falls neatly into place along phylogenetic lines leading to firm generalizations: i) in all vertebrates there is a "circadian axis" consisting of the retinas, the pineal gland and the suprachiasmatic nucleus (SCN), ii) in many non-mammalian vertebrates of all classes (but not in any mammals) the pineal gland is both a photoreceptor and a circadian oscillator, and iii) in all non-mammalian vertebrates (but not in any mammals) there are extraretinal (and extrapineal) circadian photoreceptors. An interesting explanation of some of these facts, especially the differences between mammals and other vertebrates, can be constructed on the assumption that early in their evolution mammals passed through a "nocturnal bottleneck". On the other hand, a good deal of the diversity among the circadian systems of vertebrates does not fall neatly into place along phylogenetic lines. In the present review we will consider how we might better understand such "phylogenetically incoherent" diversity and what sorts of new information may help to further our understanding of the evolution of circadian organization in vertebrates
Extracting the hierarchical organization of complex systems
M. Sales-Pardo,R. Guimera,A. Moreira,L. Amaral
Physics , 2007, DOI: 10.1073/pnas.0703740104
Abstract: Extracting understanding from the growing ``sea'' of biological and socio-economic data is one of the most pressing scientific challenges facing us. Here, we introduce and validate an unsupervised method that is able to accurately extract the hierarchical organization of complex biological, social, and technological networks. We define an ensemble of hierarchically nested random graphs, which we use to validate the method. We then apply our method to real-world networks, including the air-transportation network, an electronic circuit, an email exchange network, and metabolic networks. We find that our method enables us to obtain an accurate multi-scale descriptions of a complex system.
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