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Search Results: 1 - 10 of 9475 matches for " Moraes Caroline Leivas "
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Qualidade fisiológica de sementes e crescimento de plantulas de alface (Lactuca sativa L.) submetidas ao nitrogênio
Marini, Patrícia;Lowe, Tatiana Raquel;Moraes, Caroline Leivas;Moraes, Dario Munt de;Lopes, Nei Fernandes;
Revista Brasileira de Sementes , 2009, DOI: 10.1590/S0101-31222009000100025
Abstract: in order to obtain high quality seeds, adequate mineral fertilizing is indispensable that is important for plant development and reproduction, as well as for the seed physiological quality and consequently, for seedling growth. the objective of this research was to evaluate the physiological seed quality and lettuce seedlings growth the in presence and absence of the complete nutritive solution with emphasis on macronutrient nitrogen. the experiment was carried in the seed laboratory and greenhouse of the botany department, pelotas federal university (ufpel). the assay was conducted three times: hoagland solution ? strength, hoagland solution ? strength minus element nitrogen and water (control). the following tests were carried out: germination (tg), first germination count (pcg), germination speed index (ivg), electric conductivity (ce), seedling emergence (e), emergence speed index (ive), seedling shoot (pa) and root (sr) lengths, fresh (mf) and dry (ms) matter of seedling shoot and root, leaf area, leaf number, and pigment (chlorophylls) content. a completely randomized design was used with three replications. the means were compared by the tukey test (p<5%). the use of the complete solution and solution minus nitrogen did not interfere in the seed viability and vigor lettuce cv. regina, in tests carried out under laboratory conditions. however, under greenhouse conditions, the complete solution increased significantly the canopy length, canopy and root fresh and dry matter, increasing also the leaf area and the number of leaves per seedlings at 21 days after emergence. this parameters analyzed were not influenced by the treatments.
Altera??es fisiológicas e bioquímicas em sementes de arroz submetidas ao estresse térmico
Marini, Patrícia;Moraes, Caroline Leivas;Marini, Naciele;Moraes, Dario Munt de;Amarante, Luciano do;
Revista Ciência Agron?mica , 2012, DOI: 10.1590/S1806-66902012000400014
Abstract: the purpose of this research was to analyze the effect of different temperatures on the respiratory activity, enzymatic and in process related to the physiological quality of rice seeds, and use the relationship between these parameters to characterize the beginning of the deterioration process of seeds. the seeds were exposed during 24 h and conducted tests for germination, first count germination, index the germination speed, length and dry weight of shoot and roots, electrical conductivity, respiratory activity and activity of the enzymes. the experiment was completely randomized with four replicates and the averages compared by tukey test (p < 0.05) with subsequent analysis of regression. rice seeds showed that the germination and vigor were reduced above 25 oc temperatures. respiratory activity increased with increasing temperature, the same occurred with study enzymes activity in at five days after sowing (ranging from 14.55 at 59.86 μmol of nad+ g-1 mf min-1 for at malate dehydrogenase and 0.25 at 0.57 μmol of at nadph g-1 mf min-1 for glucose-6-phosphate dehydrogenase). therefore, it can be concluded that the evaluated biochemical tests can be used to identify the beginning of the deteriorating process of rice seeds and that temperatures above 25 oc can depreciate the quality of these seeds.
Crescimento do fungo simbionte de formigas cortadeiras do gênero Acromyrmex em meios de cultura com diferentes extratos
Borba Regina da Silva,Loeck Alci Enimar,Bandeira Juliana de Magalh?es,Moraes Caroline Leivas
Ciência Rural , 2006,
Abstract: As formigas cortadeiras mostram preferência por algumas espécies vegetais, as quais s o constantemente desfolhadas, enquanto outras n o s o atacadas, embora sejam abundantes e localizadas próximas ao ninho. As formigas dos gêneros Atta e Acromyrmex cortam plantas e transportam peda os para os formigueiros. O material vegetal é usado para o cultivo do fungo Leucoagaricus gongylophorus, do qual se alimentam. Vários trabalhos utilizando extratos de plantas têm sido realizados para avaliar o efeito sobre o desenvolvimento do fungo simbionte. O objetivo deste trabalho foi avaliar a influência de meios de cultura acrescidos de diferentes extratos sobre o crescimento do fungo L. gongylophorus. Fungos das espécies Acromyrmex ambiguus, Acromyrmex crassispinus, Acromyrmex heyeri e Acromyrmex lundi foram inoculados nos meios ágar Nutritivo e BDA, ambos acrescidos de mela o e de extratos de azevém (Lolium multiflorum Lam.), tifa (Typha angustifolia L.) e formiga (Atta sexdens piriventris). O meio Pagnocca foi utilizado como padr o. As placas foram mantidas em camaras climatizadas à temperatura de 25 + 1degreesC e escotofase de 24 hs, por um período de 49 dias. O crescimento fúngico foi avaliado com base no diametro da col nia, sendo este avaliado em intervalos semanais, totalizando sete avalia es. Também foi avaliado o peso seco do fungo aos 53 dias. Os resultados mostraram que o fungo cultivado por diferentes espécies de formigas tem crescimento diferenciado em meios de cultura com diferentes extratos.
Crescimento do fungo simbionte de formigas cortadeiras do gênero Acromyrmex em meios de cultura com diferentes extratos
Borba, Regina da Silva;Loeck, Alci Enimar;Bandeira, Juliana de Magalh?es;Moraes, Caroline Leivas;Centenaro, Elias Daniel;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000300002
Abstract: the cutter ants show preference for some vegetable species, which are constantly defoliated, while others are not attacked, although they are abundant and located close to the nest. the ants of the goods atta and acromyrmex cut plants and they transport pieces to the anthills. the vegetable material is used for the cultivation of the mushroom leucoagaricus gongylophorus, mushroom from of which theyfeed. several works using extracts of plants have been accomplished to evaluate the effect on the development of the mushroom symbiont. the objective of this work was to evaluate the influence of added culture means of different extracts on the growth of the l. gongylophorus mushroom. where mushrooms of the species acromyrmex ambiguus, acromyrmex crassispinus, acromyrmex heyeri and acromyrmex lundi were inoculated in the means nutritious ágar and bda, both added of molasses and extracts of lolium multiflorum lam., typha angustifolia l. and ant (atta sexdens piriventris). the pagnocca medium was used as pattern. the plates were maintained in cameras acclimatized to the temperature of 25 + 1°c and 24 hours of darkness, for a period of 49 days. the fungal growth was evaluated with base in the diameter of the colony, which was accomplished with weekly intervals, totalizing seven evaluations. also the dry weight was evaluated from the mushroom to the 53 days. the results showed that the mushroom cultivated by different species of ants has differentiated growth in culture means with different extracts.
Produ o in vitro de embri es bovinos com soro de égua ou de vaca em estro com ou sem a adi o de LH/FSH
Figueiró Giuliano Moraes,Leivas Fábio Galas,Rauber Lúcio Pereira,Sá Filho Manoel Francisco de
Ciência Rural , 2004,
Abstract: Mil duzentos e setenta e um oócitos foram divididos em 4 tratamentos com a finalidade de se avaliar a influência da adi o de LH e FSH na produ o in vitro de embri es bovinos com soro de vaca em estro (SVE) ou soro de éguas obtido no 1masculine dia do estro (SE). Independente do tratamento os oócitos foram maturados com TCM199 + 5,95mg/ml de Hepes, 0,025mg/ml de piruvato de sódio e 2,2mg/ml de bicarbonato de sódio, sendo adicionado 10% de soro de égua (ES), 10% de SVE (VS), 10% de soro de égua + 0,5mg/ml de horm nio luteinizante bovino (LHb) + 0,01UI/ml de horm nio folículo estimulante recombinante humano-rFSHh (EH) e 10% SVE + LHb + rFSHh (VH). Os oócitos assim tratados, foram maturados em estufa com 5% de CO2 a 39masculineC sob umidade saturada por 22-24h. Depois, foram fecundados em TALP-FERT por 18-20h e cultivados por 8 dias em meio SOF + 5% de SE (ES e EH) ou SVE (VS e VH). As taxas de clivagem de 72% obtidas no grupo VH (229/316) e 61% no grupo VS (193/315) foram significativamente menores (p<0,05) que as dos grupos ES (80% - 254/317) e EH (80% - 257/323). A produ o de embri es (blastocistos iniciais, blastocistos, blastocistos expandidos e eclodidos) no D7 após a insemina o para os grupos ES (32%), EH (28%) e VH (27%), foi significativamente superior aos 20% obtidos no VS (p<0,05). No D9, verificou-se uma diferen a significativa (p<0,05) entre os grupos ES (31%) e EH (29%) quando comparados com o grupo VS (22%), mas n o houve diferen a quando comparamos com o VH (24%). A taxa de eclos o em D9 foi de 11% (ES), 11% (EH), 10% (VS) e 5% (VH). N o houve diferen a entre as médias do número de células dos embri es (Blastocistos expandidos e eclodidos) obtidos no D9. Conclui-se, com estes resultados que, para a obten o de taxas regulares de blastocistos, n o seja necessária a adi o de horm nios quando se utilize o soro de égua, e que os horm nios devam ser adicionados quando se utilize soro de vaca.
Análise comparativa das propriedades mecanicas do ligamento da patela e do tend?o calcaneo
Müller, Sérgio Swain;Silvares, Paulo Roberto de Almeida;Pereira, Hamilton da Rosa;Silva, Marcos Augusto de Moraes;Sardenberg, Trajano;Leivas, Tomaz Puga;
Acta Ortopédica Brasileira , 2004, DOI: 10.1590/S1413-78522004000300001
Abstract: traction tests were performed in specimens obtained from 25 human cadavers, with the purpose of comparing the mechanical properties of the patellar ligament and the calcaneus tendon. age range of donors was 58 ± 14 years (33-85). there were 19 (76%) males and 6 (24%) females; 23 whites (92%) and 2 blacks (8%). the 10-mm central portion of the specimens was tested at a load application rate level of 30 mm/min. the cross-sectional area of the specimens was obtained so that their structural and material properties could be studied. the following variables were studied: ultimate load (n), stress (mpa), elasticity modulus (mpa), energy (nm), absolute (mm) and specific strain (%), yield point (n), yield point stress (mpa). statistical analysis revealed that both the patellar ligament and the calcaneus tendon, the ultimate load, proportionality limits and ultimate stress, were similar (p>0.05). the other variables showed significant differences (p<0.05). energy and strain values were higher in the calcaneus tendon. the elasticity modulus, significantly higher in the patellar ligament (p< 0.05) was the variable that best characterized the mechanical behavior of both materials.
Adenite equina: sua etiologia, diagnóstico e controle
Moraes, Carina Martins de;Vargas, Agueda Palmira Castagna de;Leite, Fábio Pereira Leivas;Nogueira, Carlos Eduardo Wayne;Turnes, Carlos Gil;
Ciência Rural , 2009, DOI: 10.1590/S0103-84782009000600050
Abstract: strangles is a contagious disease of the respiratory tract of horses produced by streptococcus equi subsp. equi, a lancefield's group c β haemolytic bacterium. it produces a mucopurulent secretion of the anterior airways, as well as lymphadenitis and abscesses. the bacteria synthesizes several pathogenicity factors such a hyaluronic acid capsule, hyaluronidase, streptolisin o, streptokinase, igg fc receptors, peptidoglican and protein m. among these factors, protein m deserves special importance due to its antifagocitic and adherence properties. the disease has high morbidity and low lethality, and produces economic losses due to low performance and treatment. clinical diagnosis and treatment are done easily, but prophylaxis is hampered by the low potency of vaccines, that protect around 50 % of vaccinated animals. strangles may occur during all the year, but cold and humid weather favors the survival of streptococci, making animals that live in regions with those characteristics more prone to infection. new vaccines using purified or subunit antigens have been developed aiming to increase their potency and to avoid undesirable side effects. the demonstration that bacteria strains show differences in their antigenicity, called attention on the selection of appropriate strains to use as antigens.
Immunogenicity and cross reactivity indices of Streptococcus equi subsp. equi strains isolated from cases of Strangles and commercial vaccines
Moraes, Carina Martins de;Silva, Mariana Sá e;Vargas, Agueda Palmira Castagna de;Nogueira, Carlos Eduardo Wayne;Leite, Fábio Pereira Leivas;Gil-Turnes, Carlos;
Ciência Rural , 2009, DOI: 10.1590/S0103-84782009005000092
Abstract: horse strangles appears frequently in animals vaccinated with commercial bacterins in rio grande do sul, brazil. aiming to know the antigenic relationships of strains recovered from sick animals among them and with two vaccines profusely used in the state, bilateral cross reactivity indices (cri) were estimated. in addition, the immunogenicity of vaccines prepared with field isolates and commercial vaccines was tested in mice. antibody titers were measured by elisa and expressed as seroconversions. thirteen strains of streptococcus equi subsp. equi, nine classified biochemically as typical and other four as atypical strains, were recovered from 35 sick horses belonging to 10 herds of rio grande do sul, brazil. the strains recovered from sick horses showed very close cri, suggesting antigenic homogeneity among them, but not with the vaccinal strains. a vaccine produced with an atypical strain induced the highest seroconversion, 9.4, while two produced with typical strains were poorly-immunogenic. the commercial vaccines were less immunogenic than five and four vaccines produced with field strains, inducing seroconversions of 2.6 and 3.8, respectively.
Pitágoras e van Hiele: uma possibilidade de conex o Pythagoras and van Hiele: a possible connection
José Carlos Pinto Leivas
Ciência & Educa??o (Bauru) , 2012, DOI: 10.1590/s1516-73132012000300010
Abstract: Este trabalho analisa como um grupo de alunos da licenciatura em Matemática e de professores em a o continuada enuncia e representa o Teorema de Pitágoras. A pesquisa tem conota o qualitativa e foi realizada num evento de Educa o Matemática, durante a realiza o de uma oficina sobre os níveis de van Hiele, no segundo semestre do ano de 2010. Aspectos de visualiza o e representa o foram observados, e constatamos que a maioria absoluta dos sujeitos investigados n o expressa corretamente o teorema numa linguagem matemática apropriada, estabelecendo conflitos cognitivos entre aspectos de medida e de formas. Além disso, as representa es do teorema, feitas pelos sujeitos, se limitam, quando o fazem, a uma única situa o, e n o d o sinais de identificarem uma generaliza o do teorema, além do aspecto geométrico de construir quadrados sobre os lados de um triangulo retangulo. This work analyses how a group of graduate students of Mathematics and practicing teachers represent Pythagoras's Theorem. The research has a qualitative approach and was held at an event of Mathematics Education, during a workshop on the van Hiele levels in the second half of 2010. Aspects of visualization and representation were observed and we found that the majority of investigated subjects don't use an appropriate language for the mathematical theorem, establishing conflict between cognitive aspects and forms of measurement. Furthermore, representations of the theorem, given by the subjects are limited, when they give them, to a single location and they don't give signs to identify a generalization of Theorem beyond the geometric aspect of constructing squares on the sides of a triangle.
As propriedades friccionais de areias de quartzo (natural e colorida): medidas efetuadas em experimentos físico-analógicos e em um ring-shear tester
Gomes, Caroline Janette Souza;Caldeira, Jefter Natan de Moraes;
Rem: Revista Escola de Minas , 2011, DOI: 10.1590/S0370-44672011000300006
Abstract: to improve knowledge of the quartz sand used in analogue modeling, two laboratory tests were carried out to investigate the frictional properties of colored sand. the first one estimated the coefficient of internal friction from the reverse fault dip simulated in a pack of different colored dry sand layers. the second test consisted of measuring stress-strain curves separately for different colored sand using a ring-shear tester. the coefficient of internal friction determined from fault dips is significantly lower and less precise than that determined on the same material with a ring-shear tester. comparisons with previous granular material tests reveal that although our ring-shear test results are high, they are within the range of values reported in literature. our results also show that natural and colored sands have different angles of internal friction, and that the acrilex dye produces a distinct mechanical behaviour for different colored sand. the variation is related to the chemical composition of sand dyes and should be carefully evaluated in future sandbox experiments.
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