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Search Results: 1 - 10 of 481085 matches for " Mauro Sérgio de Oliveira;Grossi "
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Biologia reprodutiva de Cryptostegia madagascariensis Bojer ex Decne. (Periplocoideae, Apocynaceae), espécie ornamental e exótica no Brasil
Vieira, Milene Faria;Leite, Mauro Sérgio de Oliveira;Grossi, José Antonio Saraiva;Alvarenga, Eveline Mantovani;
Bragantia , 2004, DOI: 10.1590/S0006-87052004000300002
Abstract: reproductive phenology, floral biology, breeding system and pollinators were analyzed on cryptostegia madagascariensis individuals cultivated at federal university of vi?osa campus, municipality of vi?osa, zona da mata of minas gerais state. in addition, seed viability and vigour from naturally opened fruits were tested. seed germination from yellow-green pericarp closed fruits was also tested. flowering of c. madagascariensis occurs mainly in november and december. fruits (follicles) are exhibited during all year, but more frequently in january and february. flowers open during the day and last about 24 hours. they exhibit protandry, secondary pollen presentation and intragynoecial compitum, which results in the production of twin follicles (two follicles per flower). it is self-compatible, but spontaneous self-pollination does not occur due to morphological characteristics. bees should be the main pollinators, as they exhibited the pollinarium attached to their mouthparts. at least one pollinarium was removed per flower. however, the low natural fructification (2.7%) rate indicates that these insects are efficient for pollinaria removal, but less efficient for deposition of collected pollen. the follicles take four months to reach the maximum size (average of 6.44 cm length, 2.45 cm height and 3.4 cm width), and 210 days for opening. each follicle averaged 96.5 seeds. the ideal conditions for seed quality evaluation, from naturally opened follicles, were 30 oc constant temperature and no supplementary light, and counting occurred at the 7th days. seeds from closed follicles showed 93% germination under those conditions.
Estudo espectroscópico de vidros a base de aluminato de cálcio contendo Nd3+
Pecoraro, édison;Nunes, Luiz Antonio de Oliveira;Sampaio, Jurací A.;Gama, Sérgio;Baesso, Mauro L.;
Química Nova , 2000, DOI: 10.1590/S0100-40422000000200004
Abstract: multicomponent ( al2o3, cao, sio2, mgo) calcium aluminate-based glasses containing nd3+ were prepared in order to evaluate their possibilities as laser host materials. the refractive index, uv-visible-near ir absorption spectrum, ir and visible luminescence spectra, and fluorescence decay time were measured. judd-ofelt model was used to obtain experimental intensity parameters ( w2, w4 and w6), emission cross-section, radiative lifetimes, emission branching ratios and quantum efficiency.
Clustering and artificial neural networks: classification of variable lengths of Helminth antigens in set of domains
Rodrigues, Thiago de Souza;Pacífico, Lucila Grossi Gon?alves;Teixeira, Santuza Maria Ribeiro;Oliveira, Sérgio Costa;Braga, Ant?nio de Pádua;
Genetics and Molecular Biology , 2004, DOI: 10.1590/S1415-47572004000400032
Abstract: a new scheme for representing proteins of different lengths in number of amino acids that can be presented to a fixed number of inputs artificial neural networks (anns) speel-out classification is described. k-means's clustering of the new vectors with subsequent classification was then possible with the dimension reduction technique principal component analysis applied previously. the new representation scheme was applied to a set of 112 antigens sequences from several parasitic helminths, selected in the national center for biotechnology information and classified into fourth different groups. this bioinformatic tool permitted the establishment of a good correlation with domains that are already well characterized, regardless of the differences between the sequences that were confirmed by the pfam database. additionally, sequences were grouped according to their similarity, confirmed by hierarchical clustering using clustalw.
Avalia??o da mutagenicidade e antimutagenicidade de um biopolímero extraído do microorganismo Agrobacterium radiobacter em camundongos Swiss
Primo, Milka Selestina;Calliari, Caroline Maria;Castro-Gómez, Raúl Jorge Hernan;Mauro, Mariana de Oliveira;Mantovani, Mário Sérgio;Oliveira, Rodrigo Juliano;
Revista Brasileira de Farmacognosia , 2010, DOI: 10.1590/S0102-695X2010000300009
Abstract: this study evaluated the mutagenic and ant mutagenic action of a biopolymer of glucose extracted from agrobacterium radiobacter (biopolymer of agrobacterium radiobacter). the experiment was conducted with swiss male mice divided into eight groups. treatment with the biopolymer was performed in a single dose by gavage at a dose of concomitant phosphate buffer groups in the evaluation of mutagenicity, or the agent of inducing dna damage, cyclophosphamide, the concentration of 50 mg/kg (body weight --b.w.), in groups of assessment ant mutagenic. we used the micronucleus test in peripheral blood. the blood sample was held 24 and 48 h after application of the test substances. statistical analysis showed that the biopolymer has no mutagenic activity and it is effective in preventing damage to dna. the percentages of damage reduction in groups of ant mutagenic were 83.9%, 89.1% and 103.1% in 24 h and 101.24%, 98.14% and 120.64% at doses of 48 to 75, 150 and 300 mg/kg (b.w.) respectively. the high percentage of damage reduction associated with the absence of mutagenic effects indicates the possibility of biopolymer chemoprotection action. it can also be considered a functional food candidate to be used as co-adjuvant chemotherapy to prevent side effects.
Evolu??o dos pigmentos durante o amadurecimento de mam?o 'Sunrise Solo' e 'Golden'
Fonseca, Marcos José de Oliveira;Leal, Nilton Rocha;Cenci, Sérgio Agostinho;Cecon, Paulo Roberto;Bressan-Smith, Ricardo Enrique;Balbino, José Mauro de Souza;
Revista Brasileira de Fruticultura , 2007, DOI: 10.1590/S0100-29452007000300009
Abstract: the objective of this study was to explain the peel and pulp differences between 'sunrise solo' papaya and its mutant 'golden', and to develop maturation scales for the cultivars. fruits were harvested from commercial farming located at linhares-es, brazil, at seven different maturation stages based on the peel colour. it was difficult to classify the 'golden' papaya through visual colour scale due to its lighter coloration. the 'sunrise solo' papaya had higher total chlorophyll and the a and b content. thus, this cultivar has reduced carotenoids content on initial stage and in other two stages (4" and 6" maturation stages). besides, the colour change was more evident in 'sunrise solo'. the total chlorophyll and carotenoid ratio was higher in 'sunrise solo' papaya up to the sixth stage. thereby, it is recommended careful management for the mutant, specially in relation to the harvest point, due to the difficulty to distinguish among its maturation stages.
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 Gon?alves 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.
Forma??o e trabalho de mestres e doutores em química titulados no Brasil
Braga, Mauro Mendes;Azevedo, Sérgio de;
Química Nova , 2002, DOI: 10.1590/S0100-40422002000400028
Abstract: this article reports questions related to the training and jobs of chemistry graduates from brazilian universities. it is focussed on academic and career paths and on relations between knowledge and work. the main questions addressed in this study were: what have been the paths since undergraduate education? what were graduates doing before their enrolment in master and doctoral programs? which were their motivations for this? where do graduates work now? how do they appraise some aspects of their graduate education? did the degree enlarge their job opportunities and improve work quality? how much do they earn?
Forma??o e trabalho de mestres e doutores em bioquímica titulados no brasil
Braga, Mauro Mendes;Azevedo, Sérgio de;
Química Nova , 2002, DOI: 10.1590/S0100-40422002000500025
Abstract: this article reports questions related to the training and jobs of biochemistry graduates from brazilian universities. it is focussed on academic and career paths and on relations between knowledge and work. the main questions addressed in this study were: what have been the paths since undergraduate education? what were graduates doing before their enrolment in master and doctoral programs? which were their motivations for this? where do graduates work now? how do they appraise some aspects of their graduate education? did the degree enlarge their job opportunities and improve work quality? how much do they earn?
Forma o e trabalho de mestres e doutores em bioquímica titulados no brasil
Braga Mauro Mendes,Azevedo Sérgio de
Química Nova , 2002,
Abstract: This article reports questions related to the training and jobs of biochemistry graduates from Brazilian universities. It is focussed on academic and career paths and on relations between knowledge and work. The main questions addressed in this study were: what have been the paths since undergraduate education? What were graduates doing before their enrolment in master and doctoral programs? Which were their motivations for this? Where do graduates work now? How do they appraise some aspects of their graduate education? Did the degree enlarge their job opportunities and improve work quality? How much do they earn?
Forma o e trabalho de mestres e doutores em química titulados no Brasil
Braga Mauro Mendes,Azevedo Sérgio de
Química Nova , 2002,
Abstract: This article reports questions related to the training and jobs of chemistry graduates from Brazilian universities. It is focussed on academic and career paths and on relations between knowledge and work. The main questions addressed in this study were: what have been the paths since undergraduate education? what were graduates doing before their enrolment in master and doctoral programs? Which were their motivations for this? Where do graduates work now? How do they appraise some aspects of their graduate education? Did the degree enlarge their job opportunities and improve work quality? How much do they earn?
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