oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 166 )

2018 ( 462 )

2017 ( 446 )

2016 ( 442 )

Custom range...

Search Results: 1 - 10 of 79066 matches for " Wald'ma Sobrinho;Silva "
All listed articles are free for downloading (OA Articles)
Page 1 /79066
Display every page Item
Vitrifica??o de ovócitos desnudados ou n?o e previamente maturados in vitro
Fagundes, Letícia Martins;Costa, Eduardo Paulino da;Torres, Ciro Alexandre Alves;Amaral Filha, Wald'ma Sobrinho;Silva, Trícia Osório da;Gioso, Marilú Martins;
Revista Brasileira de Zootecnia , 2004, DOI: 10.1590/S1516-35982004000500004
Abstract: this study aimed at the evaluation of the effects from cryopreservation of bovine oocytes in vitro matured, by using ethylene glycol (eg) associated to trehalose and polyvinylpyrrolidone (pvp), of ovary oocytes of slaughtered cows, randomly assigned to three treatments. treatment 0 (t0 - control): oocytes that were desnuded and not vitrified. treatment 1 (t1): cryopreservation of in vitro matured oocytes with cumulus oophorus. tratamento 2 (t2): cryopreservation of in vitro matured desnuded oocytes. the percentage of recovered oocytes after cryopreservation and with normal morphology was different for vitrified oocytes (94.7 and 76.8%; 69.5 and 48.85% for t1 and t2, respectively). the main changes ultrastructural in vitrificated oocytes were prematurely released of cortical granules. later, all normal oocytes were fecundated and cultivated at 38.5oc in atmosphere with 5% co2 for seven days. the fecundation and cleavage rates for treatments were different (56.2, 41.7 and 12.5%; 36.3, 0.0 and 0.0%, for t0, t1 and t2, respectively). morulas and blastocysts were obtained only in t0 (34.5%). these results indicate that, the used protocols, for vitrification procedure is not indicated for cryopreservation of matured bovine oocytes.
Nova pipeta para insemina o intra-uterina em suínos
Diehl Gustavo Nogueira,Amaral Filha Wald'ma Sobrinho,Kummer Rafael,Koller Felipe
Ciência Rural , 2006,
Abstract: O objetivo deste trabalho foi avaliar o desempenho reprodutivo de 423 fêmeas suínas de ordem de parto 1 a 9 submetidas à insemina o intra-uterina (IAU), com um novo modelo de pipeta (T1) cuja extremidade n o é fixada na cérvix ou uma pipeta de IAU modelo Verona e que permite a fixa o da sua extremidade em espiral na cérvix (T2). Para comparar as duas pipetas, foi considerado o grau de dificuldade para realiza o das insemina es, o tempo necessário para realizá-las, a presen a de sangramento após a insemina o, a presen a de refluxo no momento da insemina o, as taxas de retorno ao estro (TR), de prenhez (TPR) e de parto ajustada (TPA), além do número de leit es nascidos (NT). As fêmeas de ambos os grupos foram inseminadas com doses de 1 bilh o de espermatozóides, em intervalos de 24 horas. A passagem do cateter de IAU através da cérvix foi possível em 95,9% das fêmeas, sem diferen a entre os tratamentos (P>0,05). Em pelo menos uma das insemina es, foi observado sangue no cateter, após a realiza o da IAU, em 20,6% das fêmeas do T1 e 15,2% das fêmeas do T2 (P=0,14). O tempo médio necessário para realizar a insemina o foi de 2,1 minutos para o T1 e 2,3 minutos para o T2 (P=0,26). O percentual de fêmeas com refluxo de sêmen no momento da insemina o foi maior (P=0,01) no T1 (8,4%) em compara o ao T2 (2,9%). N o houve diferen a (P>0,05) nas variáveis TR (8,0 e 4,8%), TPR (93,4 e 96,2%) e NT (12,4 e 12,7 leit es) entre T1 e T2, respectivamente. A TPA do T1 (90,6%) apresentou tendência (P=0,07) de ser inferior à do T2 (95,1%). No T1, as fêmeas primíparas apresentaram maior TR e menor TPA em compara o às pluríparas (P<0,05). Os resultados mostram que a nova pipeta pode ser utilizada sem prejuízos ao desempenho reprodutivo, em fêmeas pluríparas, mas sugerem cautela para sua utiliza o em fêmeas primíparas.
Nova pipeta para insemina??o intra-uterina em suínos
Diehl, Gustavo Nogueira;Amaral Filha, Wald'ma Sobrinho;Kummer, Rafael;Koller, Felipe;Bernardi, Mari Lourdes;Wentz, Ivo;Bortolozzo, Fernando Pandolfo;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000100027
Abstract: the aim of this work was to evaluate the reproductive performance of 423 sows of 1 to 9 farrowings inseminated with two different intrauterine artificial insemination (iau) pipettes. the first group (t1) was formed by sows inseminated with a new pipette whose extremity was not fixed in the cervix. the second group (t2) was formed by sows inseminated with a veronaò pipette model, with its extremity fixed in the cervix. the degree of difficulty to perform the insemination, the time spent during the insemination, the presence of blood after insemination and of semen backflow during insemination were considered for the comparison of these pipettes. return to oestrus rate (ro), pregnancy rate (pr), adjusted farrowing rate (afr) and total litter size (tls) were also evaluated. all females were inseminated with 1 billion spermatozoa per dose applied at intervals of 24 hours. the catheter of iau was successfully inserted in 95.9% of females without difference between treatments (p>0.05). the presence of blood, in at least one insemination, was observed in 20.6% of t1 and 15.2% of t2 females (p=0.14). the average time to perform the insemination was 2.1 minutes for t1 and 2.3 minutes for t2 females (p=0.26). the percentage of females with semen backflow was significantly higher (p=0.01) in t1 (8.4%) compared to t2 (2.9%) group. there were no differences (p>0.05) in ro (8.0% and 4.8%), pr (93.4% and 96.2%) and tls (12.4 and 12.7 piglets) between t1 and t2 groups, respectively. afr of t1 (90.6%) tended (p=0.07) to be lower than that of t2 (95.1%). primiparous females of t1 showed higher ro and lower afr in comparison to pluriparous (p<0.05). the results indicate that the new pipette can be used in pluriparous females without compromising their reproductive performance. however, caution is necessary for the utilization of this new pipette in primiparous females.
Congela??o de ovócitos desnudados ou n?o, maturos e imaturos de bovinos, utilizando o Etileno Glicol pelo método convencional
Fagundes, Letícia Martins;Costa, Eduardo Paulino da;Torres, Ciro Alexandre Alves;Amaral Filha, Wald'ma Sobrinho;Guimar?es, José Domingos;
Revista Brasileira de Zootecnia , 2004, DOI: 10.1590/S1516-35982004000800014
Abstract: the objective of this study was to evaluate the cryopreservation of in vitro mature or immature oocytes by conventional method. the experiment was conducted using oocytes of cows' ovaries from slaughterhouse, distributed into six treatments: unfrozen oocytes with the cumulus oophorus cells (t1) and naked (t2) which were submitted to the process of miv, fiv and civ; immature oocytes, with the cumulus oophorus cells (t3) and naked (t4), which were submitted to the cryopreservation, unfrozen and the miv, fiv and civ; oocytes with the cumulus oophorus cells (t5) and naked (t6), which were submitted to in vitro maturation, cryopreservation, and fiv and civ. the oocytes were frozen by the conventional methods, dehydrated by the immersion in three solutions with 0.6; 1.2 and 1.8 mol l-1 of ethylene glycol (eg) during 5 minutes each phase. the thawing phase was done by the immersion in water-bath at 30 oc during 20 seconds, and so, the oocytes were re-hydrated in three phases (0.9 mol l-1 eg + 0.3 mol l-1 of sacarose; 0.3 l-1 of sacarose without eg and sacarose) for six minutes each one. the mainly ultrastructural changes in cryopreserved matured oocytes were prematurely released of cortical granules. however, the frozen immature and mature oocytes showed vacuolization and disappearance of cristae mitochondrial. the frozen immature oocytes showed the maturation rate of 82.5, 75.4, 9.2 and 5.8% for t1, t2, t3 and t4, respectively. the fecundation rate were 56.2, 0.0, 38.7, 8.6, 63.6 and 16.7% and from the cleavage were 36.3, 7.9, 0.4, 0.0, 0.0 and 0.0% for t1, t2, t3, t4, t5 and t6, respectively. morula and blastocyst were observed only for unfrozen and naked oocytes (t1) (34.5%). these results showed that the frozen protocols affect the viability of the oocytes.
Os cirurgi?es-dentistas e as representa??es sociais da Aids
Rodrigues,Maísa Paulino; Domingos Sobrinho,Moisés; Silva,Edna Maria da;
Ciência & Saúde Coletiva , 2005, DOI: 10.1590/S1413-81232005000200024
Abstract: this study tried to know the social representation of aids which is developed by the dental surgeons of the city of natal, brazil. the center of analysis comprises 100 dental surgeons, and is based on the theories of social representations. a questionnaire was applied with them, there were also semi-structured interviews and etnografhic feature observation technique was developed. the findings indicate that the dental surgeons were informed about the contamination modalities, as well as the means for risk prevention. in spite of this, knowledge was incomplete, fragmented and based on an old-fashioned and traditional view of biosafety, which hampers the development of strategies to overcome the traditional practices. a mix of fear, threats, ambivalences has been introjecting in the social representations of this phenomenon. this mechanism hinders the structuring of behaviors, as well as, real actions towards prevention. thus, it is necessary to develop new estrategies that can give a new signification the phenomenon, and at the same time, take into account the whole set of mental elaborations, emotions, daily practical and explanatory theories which are introduced in the constitution of social representation, under study, and that acts concretely by influencing the choices and before the risk of aids contamination and transmission.
Uso de Redes Neurais Artificiais para Estimar Parametros de Produ o de Galinhas Reprodutoras Pesadas em Recria
Salle CTP,Guahyba AS,Wald VB,Silva AB
Revista Brasileira de Ciência Avícola , 2001,
Abstract: Uma atividade com a magnitude da avicultura, que usa equipamentos de última gera o e servi os atualizados, é levada, na maioria dos casos, a tomar decis es que envolvem todos aspectos de produ o, apoiada em critérios subjetivos. O presente trabalho objetiva estudar a utiliza o das redes neurais artificiais para serem usadas na predi o dos parametros de desempenho das aves em recria, pertencentes a uma integra o avícola sul-brasileira. Foram utilizados os registros de 11 lotes de reprodutoras pesadas para a análise por redes neurais artificiais, no período compreendido entre 09/11/97 a 10/01/99. Os dados utilizados corresponderam a 273 linhas de registros semanais. Os modelos de redes neurais artificiais foram comparados e selecionados como melhores, baseados no coeficiente de determina o múltipla (R2), Quadrado Médio do Erro (QME), bem como pela análise de gráficos, plotando a predi o da rede versus a predi o menos o real. Os autores concluem que é possível explicar os parametros de desempenho das aves em recria, através da utiliza o de redes neurais artificiais. A técnica permite a tomada de decis es por parte do corpo técnico, baseadas em critérios objetivos obtidos cientificamente. Além disso, esse método permite simula es das conseqüências de tais decis es e fornece a percentagem de contribui o de cada variável no fen meno em estudo.
Genetic Variability of Brachiaria ruziziensis Clones to Collaria oleosa (Hemiptera: Miridae) Based on Leaf Injuries  [PDF]
Daniela Maria da Silva, Jair Campos de Moraes, Alexander Machado Auad, Marcy das Gra?as Fonseca, Fausto Souza Sobrinho
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.412300
Abstract:

Collaria oleosa causes leaf injuries to the main forage grasses used for cattle feeding in Brazil. The aim of this work was to determine resistance of B. ruziziensis clones against C. oleosa. Eighty B. ruziziensis clones were maintained in greenhouse, in which C. oleosa natural infestations have been occurring in previous years. After 40 days, damage score and chlorophyll content reduction were assessed for all clones. By using these parameters, genetic gain was estimated based on REML/BLUP mixed models. We observed significant differences for damage scores and chlorophyll content reduction among B. ruziziensis clones, evidencing genetic variability in this forage specie in regard to resistance against C. oleosa. Gain derived from selection of the 10 best clones was 18.2% and 5.80% when considering the damage score and chlorophyll content reduction, respectively. The clones CNPGL BR 10, CNPGL BR 64, CNPGL BR 97 and CNPGL BR 40 presented the highest genetic gain for both damage score and chlorophyll content reduction, and then they will be selected to continue the B. ruziziensis breeding program with the possibility of maximizing genetic gain for the next generations.

Utiliza??o de biomassa na secagem de produtos agrícolas via gaseifica??o com combust?o adjacente dos gases produzidos
Silva, Jadir N.;Cardoso Sobrinho, José;Saiki, Emílio T.;
Engenharia Agrícola , 2004, DOI: 10.1590/S0100-69162004000200020
Abstract: the main objective of this research was to verify the feasibility of the use of a close coupled biomass gasification/combustion system for drying agricultural products. it was used eucalyptus stubs, hogged wood manufacturing residue, saw dust and corncobs as fuel. a gasifier developed by silva (1988) was modified to handle those different types of fuel. gasification chamber was reduced by using a smaller grate of 0.06 m2 and also a jacket was added to the top of the reactor to use residual heat. heated air generated within combustor was mixed up with natural air to provide drying air temperature of 60 °c. this system was used for drying coffee in a dryer with moveable chambers. coffee with initial moisture of 54.5% was dried till 11.1% wet basis using wood husks for test. air static pressure exiting fan was of 9 mmwc, at 46.3 m3 min-1. it was concluded that the gasifier consumed between 15.3 to 18.8 kg h-1 of biomass; the equipment is viable for drying pulped coffee and consequently other agricultural products because it does generate clean hot air that will not pollute the product with smoke or particulate, and, also that all four types of biomass tested are viable to be used as fuel in a gasification/combustion system for drying agricultural products.
Neutrinos and Electromagnetic Gauge Invariance
F. Pisano,J. A. Silva-Sobrinho,M. D. Tonasse
Physics , 1996, DOI: 10.1016/S0370-2693(96)01250-6
Abstract: It is discussed a recently proposed connection among U(1)$_{\rm em}$ electromagnetic gauge invariance and the nature of the neutrino mass terms in the framework of $\mbox {SU(3)}_C\otimes G_W \otimes {\mbox U(1)}_N$, $G_W$ = SU(3)$_L$, extensions of the Standard Model. The impossibility of that connection, also in the extended case $G_W $ = SU(4)$_L$, is demonstrated.
Constraints on free parameters of the simplest bilepton gauge model from the neutral kaon system mass difference
F. Pisano,J. A. Silva-Sobrinho,M. D. Tonasse
Physics , 1998, DOI: 10.1103/PhysRevD.58.057703
Abstract: We consider the contributions of the exotic quarks and gauge bosons to the mass difference between the short- and the long-lived neutral kaon states in $SU(3)_C \times SU(3)_L \times U(1)_N$ model. The lower bound $M_{Z'} \sim$ 14 TeV is obtained for the extra neutral gauge boson ${Z'}^0$. Ranges for values of one of the exotic quark masses and quark mixing parameters are also presented.
Page 1 /79066
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.