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Search Results: 1 - 10 of 202044 matches for " Marcelo de Almeida Souza;Gon?alves "
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Inbreeding in sugarcane varieties
Silva, Marcelo de Almeida;Gonalves, Paulo de Souza;
Ciência Rural , 2011, DOI: 10.1590/S0103-84782011005000028
Abstract: sugarcane species are allogamous, i.e. selfing is expected to reduce plant vigor. this study was undertaken to obtain and evaluate first-generation inbred lines that may be used for further crosses and determine the extent of inbreeding depression in sugarcane. in this research, 26 parental varieties were self-pollinated to obtain about 19,000 seedlings. results showed that it is possible to segregate different traits in a given variety and find lines with promising outcome for all assessed characteristics. the soluble solids segregation observed in low and even high-brix varieties increases the possibility of quick improvement in this trait. self-pollination did not produce a general loss in yield traits such as soluble solids, stalk number and stalk diameter in any of the 26 varieties, but both stalk height and stalk weight showed strong inbreeding depression. selfing-derived clones can be used to produce hybrid vigor in crossings.
Genetic variability for girth growth and rubber yield in Hevea brasiliensis
Gonalves, Paulo de Souza;Silva, Marcelo de Almeida;Gouvêa, Ligia Regina Lima;Scaloppi Junior, Erivaldo José;
Scientia Agricola , 2006, DOI: 10.1590/S0103-90162006000300006
Abstract: basic knowledge of genetic characteristics of populations is necessary to conduct effective breeding and selection. the objective of this paper is describing the genetic variation of rubber yield and the correlation with other traits, and estimating the genetic parameters for girth growth and total number of latex vessels. sixty seven clones of hevea brasiliensis (willd. ex adr. de juss.) muell.-arg. were tested at five sites during 10 years. characters girth growth at panel opening and rubber yield, showed broad sense heritability on plot mean level, from 0.32 to 0.66 and 0.59 to 0.92, respectively. predicted genetic gains equal to 0.73 cm and 0.79 g increase respectively on girth and yield in the opening panel and mature phases seems realistic, even with moderate selection intensities. genetic correlations with rubber yield, bark thickness and total number of latex vessels were very large, and almost no genotype-environment interaction was present for girth growth. high genotype-environment interaction was present for rubber yield with genetic and phenotypic correlations across the sites, ranging from 0.64 to 0.92 (genetic) and 0.63 to 0.89 (phenotypic). total number of latex vessels rings had a high heritability, ranging from 20.0% to 64.0% in the sites e and b, respectively.
Desenvolvimento de um torquímetro de precis o para o estudo do desempenho de implantes osseointegrados
Bianchi Eduardo Carlos,Aguiar Paulo Roberto de,Santos Marcelo de Almeida Souza,Gonalves Jo?o Roberto
Rem: Revista Escola de Minas , 2003,
Abstract: Esse artigo tem como objetivo apresentar o projeto, a constru o e os resultados obtidos no estudo da osseointegra o com um torquímetro de alta precis o. Esse torquímetro, especialmente desenvolvido para este tipo de pesquisa, pode ser usado para desenvolver pesquisas odontológicas da osseointegra o de implantes dentários. Os implantes foram feitos em sete coelhos que foram avaliados após 21 e 42 dias. Alguns coelhos sofreram estimula es ultra-s nicas em seus implantes, enquanto outros foram analisados sem se submeterem a estas estimula es. Os resultados mostraram o bom funcionamento do torquímetro e que o torque para remover o implante do coelho é diretamente proporcional ao tempo de osseintegra o e que as estimula es ultra-s nicas podem influenciar o torque necessário para remover o implante em alguns casos.
Maximization of genetic gain in rubber tree (Hevea) breeding with effective size restriction
Costa, Reginaldo Brito da;Resende, Marcos Deon Vilela de;Araújo, Ant?nio José de;Gonalves, Paulo de Souza;Silva, Marcelo de Almeida;
Genetics and Molecular Biology , 2000, DOI: 10.1590/S1415-47572000000200035
Abstract: the heritability coefficients and the genetic gains associated with individual, combined and among and within progeny selection, and with multi-effect index selection in long-term rubber tree [hevea brasiliensis (willd. ex adr. de juss.) muell.-arg.] breeding were determined using effective population size (ne) restriction. twenty-two half sib progenies were planted at the jaú experimental station, s?o paulo state, brazil, in a complete randomized block design, with five replications and 10 plants per plot. the following traits were assessed when the plants were three years old: number of laticiferous vessel rings (nr), dry rubber production (rp), bark thickness (bt) and stem girth (sg). significant variability was found among progeny with good chances of obtaining genetic gain for rp, bt and sg. effective population size restriction caused a greater reduction in genetic gain for rp with combined selection and with the multi-effect index than for individual or among and within progeny selection. the simultaneous use of accuracy values and genetic gain from the lower limits of the confidence intervals for gain indicated that individual selection is to be preferred in hevea breeding programs.
Boné mineral density in children and adolescents with hepatosplenic mansonic schistosomiasis and esophageal varices who underwent splenectomy and ligature of the left gastric vein
Brandt, Carlos Teixeira;Souza, Antonio Marcelo Gonalves de;Braga, Maria Virgínia da Motta;Melo, Karina Leal Reis de;Almeida, Fernando;
Acta Cirurgica Brasileira , 1999, DOI: 10.1590/S0102-86501999000300006
Abstract: twenty eight children and adolescents from 7 to 19 years of age, suffering from hepatosplenic mansonic schistosomiasis and bleeding esophageal varices were evaluated for bone mineral density (bmd), before undergoing medical and surgical treatment. the surgical protocol was splenectomy, autoimplantation of spleen tissue into a pouch of the greater omentum and ligature of the left gastric vein. twenty one patients were evaluated after a follow up from two to nine years post surgical treatment. the bmd was measured at the lumbar spine (l2 - l4) through the dual energy absorptionmetry x-ray (dexa), using a lunar dpx-l densitometer. preoperatively, all patients showed deficit of the bmd varying from 1 to 7.07 standard deviations (mean ± sem - 2.64 ± 0.28), considering the mean line of the control curve for healthy children accepted as normal. the bmd deficit was more evident among the females than the males. after treatment there was a significant increment (c2 = 9.19 - p =0.01) of the bmd and 29% of the patients (six out of twenty one) were considered without bone mineral deficit. it was concluded that the patients included in this series, who suffer from hepatosplenic mansonic schistosomiasis, showed an important bmd deficit, specially among the females which has had a significant improvement after medical and surgical treatment.
Desenvolvimento de um torquímetro de precis?o para o estudo do desempenho de implantes osseointegrados
Bianchi, Eduardo Carlos;Aguiar, Paulo Roberto de;Santos, Marcelo de Almeida Souza;Gonalves, Jo?o Roberto;Barbosa, Darceny Zanetta;Catai, Rodrigo Eduardo;
Rem: Revista Escola de Minas , 2003, DOI: 10.1590/S0370-44672003000200008
Abstract: this paper has as objective, to present the project, the construction and the results obtained in the study of the osseointegration with a torque gauge of high precision. the torque gage, especially developed for this research type, was used to improvement of odontological research on osseointegration of dental implant. the implants were done in seven rabbits that were available after 21 and 42 days. in some rabbits were made ultra-sonic stimulations at rabbits' implants. the results showed that the torque to remove the implant of the rabbits is directly proportional at the time of osseointegration and that the ultra-sonic stimulations can also influence the torque in some cases.
Performance of new Hevea clones from IAC 400 series
Gonalves, Paulo de Souza;Silva, Marcelo de Almeida;Aguiar, Adriano Tosoni da Eira;Martins, Maria Alice;Scaloppi Junior, Erivaldo José;Gouvêa, Lígia Regina Lima;
Scientia Agricola , 2007, DOI: 10.1590/S0103-90162007000300005
Abstract: the hevea breeding program of instituto agron?mico de campinas (iac) has completed clonal evaluation on the following series: iac 100, iac 200 and iac 300. the performance of 22 clones of hevea brasiliensis (willd. ex adr. de juss.) muell.-arg., evolved at iac, over a period of eleven years was evaluated in the western central part of the s?o paulo state, brazil. among these 22 new clones, six were intraspecific hybrid clones (iac 400, iac 404, iac 405, iac 406, iac 410, iac 412) and the remaining are primary those resulted from selected ortets within half-sib progenies. an old popular clone rrim 600, of malaysian origin, was used as the control. the trial was laid out in a randomized block design with three replications. yield performance over a period of four years, mean girth at the 11th year, girth increment before tapping and on tapping, thermal property of natural rubber produced, bark thickness, number of latex vessel rows in seven year virgin bark, percentage incidence of tapping panel dryness, wind damage and diseases like leaf and panel anthracnose have been observed. sixty one percent of the clones were superior in relation to the control for yield. the clone iac 400 recorded the highest yield (97.40 g tree-1 tap-1) over four years of tapping, followed by iac 411 (78.87 tree-1 tap-1), whereas the control clone rrim 600 recorded 50.86 g tree-1 tap-1. all selected clones were vigorous in growth. girth increment of these clones was average to above average. except for iac 423, other clones had thick virgin bark at opening ranging from 4.84 mm for iac 401 to 6.38 mm for iac 416. the natural rubbers from iac clones have shown good thermal stability up to 300oc and no differences in the thermal behavior among rubber from clones of the iac series and the clone rrim 600 were found in inert atmosphere.
Bone mineral content reduction in youth with surgical form of Schistosomiasis mansoni: factors involved in the pathogenesis
Brandt, Carlos Teixeira;Souza, Ant?nio Marcelo Gonalves de;Braga, Maria Virgínia da Motta;Melo, Karina Leal Reis de;Marques, Karina de Oliveira Andrade;Sena, Andréa Dantas;Almeida, Fernando;
Acta Cirurgica Brasileira , 2001, DOI: 10.1590/S0102-86502001000100009
Abstract: thirty two children and adolescents from 14 to 20 years of age, suffering from hepatosplenic schistosomiasis mansoni and bleeding esophageal varicose veins, were evaluated for bone mineral density (bmd), before undergoing medical and surgical treatment. the surgical protocol was splenectomy, autoimplantation of spleen tissue into a pouch of the major omentum and ligature of the left gastric vein. follow up of these patients? ranges from one to ten years with a mean of five years. the bmd was measured at the lumbar spine (l2 - l4) through the dual energy absorptionmetry x-ray (dexa), using a lunar dpx-l densitometer. the degree of symmers′ fibrosis was assessed by semiautomatic hystomorphometry. in eleven patients, the serum magnesium was measured before an intravenous overload of this ion and subsequently after eight and twenty four hours. urine was collected 24 hours before and 24 hours after the magnesium overload. deficiency of magnesium was considered when the uptake of this ion was greater than 40%. there was a significant trend of association between the status of bone mineral content and the symmers′ fibrosis degree (c2 = 6.606 r = 0.01017). there was also a moderate agreement between the greater fibrosis densities ( > the mean percentage) and bone mineral deficits. although the normal bone mineral content was more found among the patients with better hepatic functional reserve, the results did not reach statistical significance. there was a marked magnesium retention (>95%) in one patient who had severe osteoporosis and a slight depletion (<5%) in another patient, who presented no bone mineral deficit. it was concluded that the patients included in this series, showed an important bmd deficit, specially among the females which has had a significant improvement after medical and surgical treatment. bone mineral deficit was associated with the degree of symmers′ fibrosis. magnesium depletion was present in two out of eleven patients. it is speculated that magn
Prediction of Hevea progeny performance in the presence of genotype-environment interaction
Gonalves, Paulo de Souza;Moraes, Mário Luiz Teixeira de;Silva, Marcelo de Almeida;Gouvêa, Lígia Regina Lima;Aguiar, Adriano Tosoni da Eira;Costa, Reginaldo Brito da;
Brazilian Archives of Biology and Technology , 2009, DOI: 10.1590/S1516-89132009000100004
Abstract: twenty two open-pollinated hevea progenies from different parental clones of the asian origin were tested at five sites in the northwestern s?o paulo state brazil to investigate the progeny girth growth, rubber yield, bark thickness and plant height. except for the rubber yield, the analysis of variance indicated highly significant (p<0.01) genotype x environment interaction and heterogeneity of regressions among the progenies. however, the regression stability analysis identified only a few interacting progenies which had regression coefficients significantly different from the expected value of one. the linear regressions of the progeny mean performance at each test on an environmental index (mean of all the progenies in each test) showed the general stability and adaptability of most selected hevea progenies over the test environments. the few progenies which were responsive and high yielding on different test sites could be used to maximize the rubber cultivars productivity and to obtain the best use of the genetically improved stock under different environmental conditions.
Leishmanial antigens in the diagnosis of active lesions and ancient scars of American tegumentary leishmaniasis patients
Schubach, Armando;Cuzzi-Maya, Tullia;Oliveira, Albanita V;Sartori, Alexandrina;Oliveira-Neto, Manoel P de;Mattos, Marise S;Araújo, Marcelo Lodi;Souza, Wilson Jacinto S;Haddad, Fátima;Perez, Maurício de A;Pacheco, Raquel S;Momen, Hooman;Coutinho, Sérgio G;Marzochi, Mauro Célio de Almeida;Marzochi, Keyla Belizia Feldman;Costa, Sylvio Celso Gonalves da;
Memórias do Instituto Oswaldo Cruz , 2001, DOI: 10.1590/S0074-02762001000700018
Abstract: cutaneous biopsies (n = 94) obtained from 88 patients with american tegumentary leishmaniasis were studied by conventional and immunohistochemical techniques. specimens were distributed as active lesions of cutaneous leishmaniasis (n = 53) (group i), cicatricial lesions of cutaneous leishmaniasis (n = 35) (group ii) and suggestive scars of healed mucosal leishmaniasis patients (n = 6) (group iii). in addition, active cutaneous lesions of other etiology (n = 24) (group c1) and cutaneous scars not related to leishmaniasis (n = 10) (group c2) were also included in the protocol. amastigotes in group i biopsies were detected by routine histopathological exam (30.2%), imprint (28.2%), culture (43.4%), immunofluorescence (41.4%) and immunoperoxidase (58.5%) techniques; and by the five methods together (79.3%). in group ii, 5.7% of cultures were positive. leishmanial antigen was also seen in the cytoplasm of macrophages and giant cells (cellular pattern), vessel walls (vascular pattern) and dermal nerves (neural pattern). positive reaction was detected in 49 (92.5%), 20 (57%) and 4 (67%) biopsies of groups i, ii and iii, respectively. antigen persistency in cicatricial tissue may be related to immunoprotection or, on the contrary, to the development of late lesions. we suggest that the cellular, vascular and neural patterns could be applied in the immunodiagnosis of active and cicatricial lesions in which leishmaniasis is suspected.
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