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Search Results: 1 - 10 of 42881 matches for " Rodrigo Alves;Martins "
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Leaf anatomy of rubber-tree clones
Martins, Maria Bernadete Gon?alves;Zieri, Rodrigo;
Scientia Agricola , 2003, DOI: 10.1590/S0103-90162003000400015
Abstract: rubber trees are easily recognizable for being woody, medium to large-sized plants, having a typical deciduous behavior, and especially because they produce latex. the purpose of this work was to study the anatomy and morphology of the leaf, comparing rubber tree &91;hevea brasiliensis (willd. ex adr. de juss.) muell.-arg.&93; clones (rrim 600 and gt 1) grafted on the same root stock (tjir 1), grown under the same climatic and soil conditions. this study allowed clones to be differentiated and also provided information on the location and disposition of laticifers in the leaf tissue. cross sections of the mesophyll, center ribbing and petiole regions were made, followed by usual permanent histological blade methods. biometric analyses of tissue extensions in the palisade and spongy parenchymas were carried out, and the number of cells in the spongy parenchyma were counted. at the same time, biometrical analyses were made for stomata. the comparison between the clones showed that there were no significant differences in epidermal cell height, spongy parenchyma height, number of cells in the spongy parenchyma layer, and size and width of leaflets. however, variation was observed for cell thickness in the palisade parenchyma. the clone gt1 presented greater thickness as compared to the rrim 600 clone. gt1 had also a greater number of stomata in comparison to rrim 600, but they were smaller. gt1 presented greater petiole and center ribbing diameters in the leaves and a greater amount of sclerenchyma fibers than rrim 600.
Leaf anatomy of rubber-tree clones
Martins Maria Bernadete Gon?alves,Zieri Rodrigo
Scientia Agricola , 2003,
Abstract: Rubber trees are easily recognizable for being woody, medium to large-sized plants, having a typical deciduous behavior, and especially because they produce latex. The purpose of this work was to study the anatomy and morphology of the leaf, comparing rubber tree &91;Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg.&93; clones (RRIM 600 and GT 1) grafted on the same root stock (Tjir 1), grown under the same climatic and soil conditions. This study allowed clones to be differentiated and also provided information on the location and disposition of laticifers in the leaf tissue. Cross sections of the mesophyll, center ribbing and petiole regions were made, followed by usual permanent histological blade methods. Biometric analyses of tissue extensions in the palisade and spongy parenchymas were carried out, and the number of cells in the spongy parenchyma were counted. At the same time, biometrical analyses were made for stomata. The comparison between the clones showed that there were no significant differences in epidermal cell height, spongy parenchyma height, number of cells in the spongy parenchyma layer, and size and width of leaflets. However, variation was observed for cell thickness in the palisade parenchyma. The clone GT1 presented greater thickness as compared to the RRIM 600 clone. GT1 had also a greater number of stomata in comparison to RRIM 600, but they were smaller. GT1 presented greater petiole and center ribbing diameters in the leaves and a greater amount of sclerenchyma fibers than RRIM 600.
Atualiza??o terapêutica no tratamento dos craniofaringiomas
Bordallo, Maria Alice Neves;Ferreira, Rodrigo Martins;Bulzico, Daniel Alves;
Arquivos Brasileiros de Endocrinologia & Metabologia , 2011, DOI: 10.1590/S0004-27302011000800004
Abstract: craniopharyngioma is an uncommon benign neoplasm, accounting for 1%-3% of all intracranial tumors, and the most common non-neuroepithelial intracranial neoplasm in childhood. usually, the tumor is confined to the sellar region and the third ventricle, but due to frequent infiltration and adherence to the central nervous system, it often has an unfavorable clinical behavior. therefore, it is classified by the world health organization (who) as a tumor of low or uncertain malignant potential. endocrine after effects, mainly hypothalamic hypopituitarism, obesity and diabetes insipidus are highlighted due to their important impact on the quality of life of patients, mostly children. optimal treatment of this tumor is a major challenge for neurosurgeons and endocrinologists. the combination of surgery, radiation, and application of radioisotopes and intratumoral drugs, aims at maximizing the chances of cure with minimal complications. yet, recurrence is still frequent. choosing the best treatment modality for craniopharyngiomas is a difficult decision, and it should always be specific for each case. in order to explore the multiple therapeutic options for craniopharyngiomas, we reviewed the literature with emphasis on the therapeutic possibilities and complications inherent to the treatment of this disease.
Regenera??o de cianetos pelo processo ARV associado ao emprego de resinas poliméricas de troca i?nica
Silva, Adriana Lara da;Costa, Rodrigo Alves;Martins, Afonso Henriques;
Rem: Revista Escola de Minas , 2002, DOI: 10.1590/S0370-44672002000200008
Abstract: this work presents the bench scale experimental results for the cyanide regeneration from pure alkaline aqueous solutions of gold, cooper and iron cyanocomplexes using the avr process associated to the ion exchange polymeric resins imac hp555sò ((room&haas-usa) and amberlite ira-420ò (room&haas brasil ltda.). the resin imac hp555sò adsorved 64.5% cn, 87.4% au, 64.9% cu and 60.5% fe from the alkaline solution containing metal cyanocomplexes. meanwhile, the elution stage with h2so4 and thiourea reached 31.2% cn, 86.2% au, 86.4% cu e 41.5% fe. the resin ira-420ò adsorbed 53.4% cn, 86.3% au, 83.8% cu and 86.0% fe under the same experimental conditions adopted for the resin imac hp555sò. the resin amberlite ira-420ò eluted 48% cn, 96.8% au, 9.1% cu and 76% fe.
Regenera o de cianetos pelo processo ARV associado ao emprego de resinas poliméricas de troca i nica
Silva Adriana Lara da,Costa Rodrigo Alves,Martins Afonso Henriques
Rem: Revista Escola de Minas , 2002,
Abstract: Esse trabalho apresenta os resultados da regenera o de cianetos, presentes em solu es aquosas com composi o química similar ao de efluentes típicos da cianeta o do ouro, através do processo AVR (Acidifica o, Volatiliza o, Reneutraliza o) associado ao emprego de resinas poliméricas ani nicas de troca i nica Imac HP555sò (Rohm&Haas Co.-USA) e Amberlite IRA-420ò (Room&Haas Química Ltda.-Brasil). A resina Imac HP555sò adsorveu 64,5% CN, 87,4% Au, 64,9% Cu e 60,5% Fe presentes em uma solu o alcalina mista de cianocomplexos metálicos. Na etapa de elui o com H2SO4 e tiouréia foram alcan ados 31,2% CN, 86,2% Au, 86,4% Cu e 41,5% Fe. A resina IRA-420ò, nas mesmas condi es experimentais do estudo da resina Imac HP555sò, adsorveu 53,4% CN, 86,3% Au, 83,8% Cu e 86,0% Fe. Em termos de elui o, a resina Amberlite IRA-420ò obteve 48% CN, 96,8% Au, 9,1% Cu e 76% Fe.
Pathogenesis of rabies virus by ERA and PV strains administered orally in hamsters (M. auratus)
Alves, Luciane Martins;Soares, Rodrigo Martins;Cortez, Adriana;Richtzenhain, Leonardo José;Ito, Fumio Nonma;
Brazilian Journal of Veterinary Research and Animal Science , 2003, DOI: 10.1590/S1413-95962003000100010
Abstract: hamsters orally inoculated with era and pv strains of rabies virus were sacrificed at 24, 48, 72 hours, 21 and 30 days after inoculation. brain fragments were examined by fluorescent antibody test (fat) and heminested pcr (hn-pcr). fragments from stomach, blood, heart, and lung were examined only by hn-pcr. sera of other hamsters, similarly inoculated, obtained at 30th day after inoculation were submitted to mouse neutralization test. the hamsters were challenged intracerebrally with cvs strain with 102.7mouse ld50/0.03ml, 45 days after inoculation. brains examined by fat were negative. the hn-pcr detected the presence of rabies virus rna in the lung of one animal inoculated with era, and in the brain, stomach, blood, and lung of pv-infected animals. the orally inoculated virus was capable to infect and replicate in several organs and tissues; however, none of the challenged hamsters did survive after challenge.
Bioacústica e sítio de vocaliza??o em taxocenoses de anuros de área aberta no noroeste paulista
Silva, Rodrigo Augusto;Martins, Itamar Alves;Rossa-Feres, Denise de Cerqueira;
Biota Neotropica , 2008, DOI: 10.1590/S1676-06032008000300012
Abstract: the calling site and the acoustic parameters of the advertisement call were determined for 18 anuran species in six ponds in the northwest region of s?o paulo state. the dominant frequency of the advertisement call was positively correlated with the crc of the species: small size species vocalized in a higher frequency, whereas larger species vocalized in a lower frequency. the similarity in the spectral and temporal parameters of the advertisement call was high among 94% of the recorded species. the similarity on calling site was low; only 22% of species presented high overlap, in spite of about a half of the species have been generalist in calling site use. analysing simultaneously the similarity on calling site, habitat and advertisement call parameters, the proportion of species with high overlap decreased from 94 to 11%, corresponding to the overlap between a single pair of species: dendropsophus elianeae and d. minutus. the species that overlap in calling site presented segregation in acoustic parameters, and those that overlap in acoustic parameters tended to partition the calling site. this result suggests the occurrence of niche complementarity, since species that occupied a similar position in one dimension tended to differ in another dimension. the structural homogeneity of ponds, the climatic severity of the region and the high degree of habitat loss restrict the abundance of population and the species richness of the anuran assemblages. the low overlap on the calling site is probably associated with the insaturation of the sampled communities.
Papel Interactivo - Produ??o e caracteriza??o de dispositivos electrocrómicos em papel
Correia,Nuno; Costa,Cláudia; Gon?alves,Alexandra; Pereira,Sónia; Fortunato,Elvira; Martins,Rodrigo;
Ciência & Tecnologia dos Materiais , 2009,
Abstract: this work reports the production of electrochromic devices on paper substrates. an electrochromic cell is composed by several layers (substrate/electrode /electrochromic/electrolyte/counter-electrode/electrode/substrate). applying a potential difference between electrodes will result in an alternate change of the electrochromic material from colored to bleached state. these devices have gained interest in the scientific community specifically in the search for new lightweight, flexible and low cost substrates. morphological, electrical, structural and optical characterization was made. combining electrochromic technology with paper revealed singular challenges inherent to this material, due to its fragility and surface roughness. however adding this functionality to such a common material not only increases its value but also provides new opportunities for the disposable electronic market.
Environmental heterogeneity: Anuran diversity in homogeneous environments
Silva, Rodrigo Augusto;Martins, Itamar Alves;Rossa-Feres, Denise de C.;
Zoologia (Curitiba) , 2011, DOI: 10.1590/S1984-46702011000500009
Abstract: the northwestern region of s?o paulo was extensively deforested during the agricultural expansion in the last century and only small fragments of the original vegetation cover remained. in this study, we investigated how habitat features influence the composition, richness, and diversity of anurans in environments homogenized by agricultural activities. we sampled monthly six breeding ponds located in pasture areas during twelve months. we recorded ten environmental descriptors for each breeding pond. we found 18 anuran species. the breeding ponds were structurally similar, but species composition differed among them. the environmental descriptors influence varies for each species, as demonstrated by the different associations between species and environmental descriptors shown in the canonical correspondence analysis (cca). seven of the ten environmental descriptors explained 67% of the species richness, showing that environmental characteristics influenced the occurrence of the different species. there is no such data set for the region and also for most brazilian regions, despite its importance in guiding species-oriented conservation actions.
Changes in wild bee fauna of a grassland in Brazil reveal negative effects associated with growing urbanization during the last 40 years
Aline C. Martins,Rodrigo B. Gon?alves,Gabriel A. R. Melo
Zoologia (Curitiba) , 2013,
Abstract: Bee fauna and associated flora from a grassland site in Brazil, surveyed 40 and 20 years ago, were newly surveyed with comparable methodology to evaluate changes in the bee fauna of this site, considering that human population and urbanization has exponentially increased in the last 40 years. In general, bee species richness has declined in 22%, as well as their abundance. Some of the previously abundant species are now absent, including Bombus bellicosus Smith, 1879, Gaesischia fulgurans (Holmberg, 1903) and Thectochlora basiatra (Strand, 1910). No particular trend of differential decrease among either taxonomic or functional groups was observed, except for a minor increase in the proportion of oligolectic species and a 50% reduction in the number of large species. The first two surveys were more similar to each other in species richness per bee genus, while the two most recent grouped together based on measures of anthropogenic impact. Furthermore, the number of plant species visited by bees increased, with a pronounced increase in ruderal and exotic species. Crop cultivation, competition with honeybees and climate changes may all be related to bee decline. Nevertheless, the effects of urbanization, in particular intense land occupation and few preserved natural areas can be pointed as the main causes of species decline. Due to continuing increase in human population, increased erosion in diversity is expected. Habitat protection is an additional challenge to bee conservation in the region, with no local conservation units set aside for grasslands. State and municipal agencies should urgently consider the establishment of reserves for the few remaining patches of natural grasslands.
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