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Search Results: 1 - 10 of 213777 matches for " Larissa P.;Ribeiro "
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Uma nova espécie de Sigara Fabricius (Hemiptera, Heteroptera, Corixidae) e redescri??o das espécies do gênero com registro no Estado do Rio Grande do Sul, Brasil
Bernardo, Larissa P.;Ribeiro, José Ricardo I.;Stenert, Cristina;Maltchik, Leonardo;
Revista Brasileira de Entomologia , 2012, DOI: 10.1590/S0085-56262012005000032
Abstract: a new species of sigara fabricius (hemiptera, heteroptera, corixidae) and redescription of the species recorded in the state of rio grande do sul, brazil. water boatmen (corixidae) constitute the largest group of water bugs, with well over 40 species occurring in brazil. most of the species of sigara are known from the neotropics, and 11 of them have been reported in brazil. little is known about the distribution and taxonomy of sigara species of rio grande do sul. the following seven species are recorded and redescribed: sigara (tropocorixa) chrostowskii, s. (t.) denseconscripta, s. (t.) dita, s. (t.) hungerfordi, s. (t.) platensis, s. (t.) schadei, and s. (t.) townsendi. sigara (t.) dita, s. (t.) hungerfordi, and s. (t.) townsendi are newly recorded from this state, while s. (t.) schadei is recorded for the first time from brazil. sigara (t.) bachmanni, sp. nov. is described from northeastern rio grande do sul. this species resembles s. (t.) hungerfordi in having the synthlipsis less than 0.9 times the width of an eye, metaxyphus broader than long, and the infraocular portion of genae slender, but can be readily recognized by the presence of a short hook at apex of right clasper and serrations along the margin of its pre-apical portion. a key to the species of sigara occurring in rio grande do sul is provided. although the general aspect of right clasper and the number of pegs of male pala as well as its shape have proven useful for species delimitation, s. (t.) chrostowskii and s. (t.) townsendi have shown considerable variation in these features and have been redescribed here.
New genes conferring resistance to Asian soybean rust: allelic testing for the Rpp2 and Rpp4 loci
Laperuta, Larissa Di Cássia;Arias, Carlos Alberto Arrabal;Ribeiro, Aliny Simony;Rachid, Breno Francovig;Pierozzi, Pedro Henrique Braga;Toledo, José Francisco Ferraz de;Pípolo, Antonio Eduardo;Carneiro, Geraldo Estevam de Souza;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008001200014
Abstract: the objective of this study was to conduct allelic tests including crosses between a group of rust resistant genotypes from embrapa's soybean germplasm collection and pi 230970 and pi 459025, which carry the rpp2 and rpp4 genes, respectively. asian soybean rust (asr) caused by the fungus phakopsora pachyrhizi has resulted in significant yield losses and concern among brazilian farmers. until recently, there were four resistance genes (rpp1 through rpp4) described in the literature, but only rpp2 and rpp4 are still effective in brazil. twenty-six sources of resistance to p. pachyrhizi were crossed with pi 230970 and pi 459025 (rpp2 and rpp4 gene sources, respectively) and plants of their f2 generations were infected with a suspension containing 2.5x104 spores per milliliter and assessed in a greenhouse after 20 days, for the presence of resistant (rb) or susceptible (tan) lesions. chi-square tests were applied to investigate the hypotheses of independent or allelic resistance gene segregations. asr resistant genes derived from pi 197182, pi 230971 and pi 417125 did not segregate in crosses with pi 230970, which indicates that these genotypes have a single resistance gene in the rpp2 locus. crosses with the other 23 genotypes resulted in segregating populations, suggesting that their resistance genes do not belong to rpp2 or rpp4 loci.
Utiliza??o de APPCC na indústria de alimentos
Ribeiro-Furtini, Larissa Lagoa;Abreu, Luiz Ronaldo de;
Ciência e Agrotecnologia , 2006, DOI: 10.1590/S1413-70542006000200025
Abstract: searching for high quality foods has increased on the last few years, mainly due to the higher consumers and market requirements. such a situation has generated efforts from researchers in order to develop systems capable to ensure high standard food safety. such a these systems must be effective not only concerning sanitary aspects but also aiming decreasing losses and increasing competitiveness as well. the haccp system can effectively attain those requirements, by having as philosophy the prevention of hazards and working along with another programs previously utilized, such an action avoids unnecessary expenses with prior investments, for, it utilizes investments already made in other pre-existing programs. haccp implementation meets both national and international legislation requirements, providing safeness and open opportunities for international food trading. however, in brazil, there still are some difficulties concerning wide implementation and enforcement of the program.
Efeitos dos estrogênios sobre a cogni o, o humor e as doen as cerebrais degenerativas
Aldrighi José Mendes,Pires Andréa Larissa Ribeiro
Revista da Associa??o Médica Brasileira , 2001,
Abstract:
Identification of Phenotypic and Genotypic Variability among the Isolates of Ramularia areola of Brazilian Cotton  [PDF]
Larissa Girotto, Mariana S. Marangoni, Janaina N. Matos, Rafael Galbieri, Wilson P. Almeida, Yeshwant R. Mehta
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.49232
Abstract:

Genotypic and phenotypic variation among 16 isolates of Ramularia areola of Gossypium hirsutum collected from five different geographical regions of Brazil was studied through virulence spectrum on three cultivars in the glasshouse and through ERIC- and REP-PCR and ITS1-5.8S-ITS2 rDNA analysis. Difference in virulence spectrum and molecular analysis of some isolates was observed. ERIC- and REP-PCR showed similar results and revealed a high level of diversity among the isolates. A unique profile for both ERIC and REP was obtained for most isolates. On the other hand, the ITS rDNA analysis did not show different PCR-RFLP patterns. While some isolates differed among each other considering genotypic and phenotypic reactions, no clear cut evidence was found about the existence of genetic lineages of R. areola in Brazil. Identification of genetic variability among the R. areola isolates originated from different geographic regions would permit screening of Brazilian germplasm and achieve sources with a wide spectrum of resistance. This is the first report of the genotypic and phenotypic variability among the R. areola isolates originated from five cotton growing regions of Brazil.

Peer selection and influence effects on adolescent alcohol use: a stochastic actor-based model
Marlon P Mundt, Liesbeth Mercken, Larissa Zakletskaia
BMC Pediatrics , 2012, DOI: 10.1186/1471-2431-12-115
Abstract: The study analyzes data from Add Health, a longitudinal survey of seventh through eleventh grade U.S. students enrolled between 1995 and 1996. A stochastic actor-based model is used to model the co-evolution of alcohol use and friendship connections.Selection effects play a significant role in the creation of peer clusters with similar alcohol use. Friendship nominations between two students who shared the same alcohol use frequency were 3.60 (95% CI: 2.01-9.62) times more likely than between otherwise identical students with differing alcohol use frequency. The model controlled for alternative pathways to friendship nomination including reciprocity, transitivity, and similarities in age, gender, and race/ethnicity. The simulation model did not support a significant friends’ influence effect on alcohol behavior.The findings suggest that peer selection plays a major role in alcohol use behavior among adolescent friends. Our simulation results would lend themselves to adolescent alcohol abuse interventions that leverage adolescent social network characteristics.Early adolescent alcohol use is a major public health challenge. One quarter of all adolescents begin drinking alcohol by 13?years of age [1]. Drinking before the 14th birthday is associated with a fourfold increase in risk of alcohol dependence in adulthood [2]. Early alcohol initiation is linked to many risky adolescent behaviors, including marijuana and cocaine use, having sex with multiple partners, and academic underperformance [3].A wide body of literature indicates that adolescents and their friends exhibit more similar alcohol use behavior than would be expected by chance alone [4,5]. Drinking by a best friend has been tied to alcohol initiation among middle and high school students [6,7]. In a systematic review of longitudinal studies on adolescent drinking, alcohol-using peers were consistently predictive of an adolescent’s own drinking behavior at a later wave [8]. However, there is debate over the m
Upper Maeotian-Lower Pontian "Transitional Strata" in the Taman Peninsula: stratigraphic position and paleogeographic interpretation
Eleonora P. Radionova, Larissa A. Golovina
Geologica Carpathica , 2011, DOI: 10.2478/v10096-011-0007-x
Abstract: Three sections (Taman, Popov Kamen, and Zheleznyi Rog) of the Upper Maeotian-Lower Pontian sediments of the Taman Peninsula (Eastern Paratethys) have been studied. The sequences represent continuous successions of the Maeotian and Pontian sediments. The transitional Upper Maeotian-Lower Pontian relatively deep-water sediments were formed at the time when Eastern Paratethys was connected with other marine basins. The facies are represented by thin clay layers interbedded with laminated diatomites and contain unusual diatom and nannofossil associations. The small size of coccoliths and the absence of zonal markers indicate that the influx of marine waters took place in the stressed conditions of a restricted basin. Diatom assemblages are more diverse and include the open-marine species Azpeitia aff. komurae and Thalassiosira maruyamica and marine endemics Actinocyclus aff. paradoxus, Rhizosolenia bezrukovii, Hemiaulus sp., Nitzschia miocenica of the tropical Nitzschia miocenica Zone and — the index species of next Thalassiosira convexa Zone appear in these part of the sections. Three stages of the Mediterranean marine invasion are distinguished; during the first one the connection between basins was rather permanent, for the two others its character became pulsing and not stable. The possible duration of the invasion is estimated from 6.4 to 6.1 Ma and belongs to the Early Messinian — to pre-evaporate deposits and lower part of lower evaporate deposits.
Al-Doping Effect on the Surface Morphology of ZnO Films Grown by Reactive RF Magnetron Sputtering  [PDF]
Erica Pereira da Silva, Michel Chaves, Gilvan Junior da Silva, Larissa Baldo de Arruda, Paulo Noronha Lisboa-Filho, Steven Frederick Durrant, José Roberto Ribeiro Bortoleto
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.412096
Abstract:

Zinc oxide (ZnO) and aluminum-doped zinc oxide (ZnO:Al) thin films were deposited onto glass and silicon substrates by RF magnetron sputtering using a zinc-aluminum target. Both films were deposited at a growth rate of 12.5 nm/min to a thickness of around 750 nm. In the visible region, the films exhibit optical transmittances which are greater than 80%. The optical energy gap of ZnO films increased from 3.28 eV to 3.36 eV upon doping with Al. This increase is related to the increase in carrier density from 5.9 × 1018 cm-3 to 2.6 × 1019 cm-3. The RMS surface roughness of ZnO films grown on glass increased from 14 to 28 nm even with only 0.9% at Al content. XRD analysis revealed that the ZnO films are polycrystalline with preferential growth parallel to the (002) plane, which corresponds to the wurtzite structure of ZnO.

AVALIA O SENSORIAL DE CREAM CHEESES POTENCIALMENTE SIMBIóTICOS UTILIZANDO A METODOLOGIA DE SUPERFíCIE DE RESPOSTA
Larissa de Lima ALVES,Paula MATTANNA,Larissa Vargas BECKER,Neila S.P.S. RICHARDS
Alimentos e Nutri??o , 2009,
Abstract: Os queijos frescos s o propícios à adi o de pre- e probióticos por seu pH, umidade e temperatura de fermenta o característicos. Com o objetivo de avaliar o efeito de diferentes concentra es de probióticos e prebiótico sobre parametros sensoriais em cream cheese, doze formula es foram elaboradas com concentra es de probióticos (Bi dobacterium animalis Bb-12 e Lactobacillus acidophilus La-5) e prebiótico (inulina) adotadas conforme delineamento central composto rotacional. A avalia o sensorial foi realizada por 80 painelistas n o treinados através de teste com escala hed nica (7 níveis) e de ordena o quanto aos parametros sensoriais de aparência geral, cor, aroma, textura, acidez e sabor. Com os mesmos dados foram obtidas as superfícies de resposta para os mesmos parametros. N o foi detectada diferen a estatística pelo teste de Tukey (p < 0,05) na avalia o por escala hed nica, exceto para aroma; tampouco foi veri cada preferência estatisticamente signi cante entre as formula es no teste de ordena o. Contudo, as superfícies de resposta apontam diferentes regi es com tendência à melhor aceita o, variando cada regi o conforme o atributo analisado. Demonstra-se a viabilidade da elabora o de cream cheese simbiótico, sendo que a concentra o de pre- e probióticos aos níveis estudados neste trabalho n o afetaram signi cativamente a aceitabilidade do consumidor pelo produto.
Search for a Microsatellite Marker Linked with Resistance Gene to Xanthomonas axonopodis pv. malvacearum in Brazilian Cotton  [PDF]
Mariana Marangoni, Larissa Girotto, Maria Paula Nunes, Wilson P. Almeida, Rafael Galbieri, Ivan Schuster, Yeshwant R. Mehta
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.410255
Abstract: The cotton cultivar DELTAOPAL is resistant under field as well as under glasshouse conditions to the Brazilian isolates of Xanthomonas axonopodis pv. malvacearum (Xam). Segregating populations derived from the cross between this cultivar and one susceptible cv. BRS ITA 90, were utilized to identify molecular marker linked with the resistance gene to Xam by “Bulk Segregant Analysis (BSA)”. Two hundred and twenty microsatellite (Single Sequence Repeat—SSR) primers were tested. The amplification products were visualized in polyacrylamide gels stained with silver nitrate. Only one primer was informative and showed polymorphism between the DNA of the parents and their respective bulks of homozygous F2 populations contrasting for resistance and susceptibility, and hence was used to analyze DNA of 120 F2 populations. The microsatellite primer yielded one band of 80 bp linked with the resistance locus, which was absent in the susceptible parent as well as in the bulk of the homozygous susceptible plants of the cross. The segregation ratio as determined by phenotypic analysis was 3R:1S. It is believed that the microsatellite marker was linked with the resistance locus and hence may offer new perspectives for marker assisted selection against the angular leaf spot disease of cotton. It is however, felt necessary to repeat the microsatellite analysis and make sure that the primer is tightly linked with the resistance locus and at the same time verify the genetic distance between the marker and the resistance locus.
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