530 resultados para raiz tuberosa
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The present work aimed to evaluate the initial growth and leaf mineral levels in passion fruit trees (Passiflora edulis f. flavicarpa Deg., P. edulis f. edulis Sims. and P. alata Dryander) grafted onto Passiflora cincinnata. To obtain seedlings, seeds were sown in plastic bags (500 mL) and hypocotyl grafting was performed when seedlings reached the stage of two fully expanded leaves. Fifteen days after grafting, plants were transplanted to 10L pots filled with previously limed and fertilized soil. Each pot contained two plants and corresponded to one plot. For each commercial species studied as rootstock, experimental design was completely randomized, in 3x5 (plant type x time of harvest) factorial arrangement, with four replicates of two plants per plot and five destructive harvests. Plant types were ungrafted P. cincinnata, ungrafted commercial passion fruit tree and commercial passion fruit tree grafted onto P. cincinnata. The first harvest was performed at 15 days after transplanting and the remaining ones at 14-day intervals (60, 74, 88, 102 and 116 DAS). At each harvest, the number of leaves per plant was counted, and leaf area, stem length, and stem, root, leaf and total dry matter were estimated. At the last harvest, the mineral composition (macro and micronutrients) of plants was analyzed. In general, it was observed that grafting onto P. cincinnata did not interfere negatively with the initial development and mineral levels of commercial passion fruit trees, and this interference varied according to the used canopy.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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The objective of this work was to develop a methodology for seed processing and X-ray analysis and to study imbibition pattern in seeds of candeia (Eremanthus incanus). Seeds were gathered in 2001 and 2002 in Morro do Pilar and Lavras respectively, processed and stored in a cold chamber (5ºC/60%RH) until the start of experiments. In order to identify unfilled seeds, a protocol was developed for X-ray use combining radiation energy (Kv) and exposure time (seconds). For elimination of unfilled seeds, an experiment was conducted using a South Dakota seed blower whereby different opening settings and ventilation times were combined. Original seed lots and categorized lots following radiograph viewing were tested by germination tests, with seeds being cleansed in sodium hypochlorite and scattered over blotting paper in 'gerboxes' and then taken to germinators with alternating temperatures of 20º-30ºC and 10 hours of light, for up to 15 days. Imbibition curves were determined under the conditions 30ºC, 20º-30ºC/10 hours of light and 30º-20ºC/10 hours of light. The X-ray protocol that best allowed viewing of internal seed structures was 30Kv for 45 seconds. Seed separation using the blower setting at a 3.0 opening for 30 seconds raised the number of embryonic seeds to values exceeding 99%, also raising the germination rates as a consequence. The imbibition pattern is three-phased and the germination process is completed in 72 hours. Under alternate temperatures, primary root growth is favored.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Pós-graduação em Odontologia Restauradora - ICT
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Pós-graduação em Biopatologia Bucal - ICT
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Once petroleum is na exhaustible source of energy, alternative fuels are having more prominence. A much discussed option for replacing fossil fuels is the use of biofuels derived from oils or fats, especially biodiesel. The biodiesel preparation is through a reaction named transesterification, a reaction of triglycerides with a short chain alcohol with a catalyst, producing a mixture of fatty acid esters and glycerol. According to ANP (National Petroleum Agency) specifications, biodiesel can have contaminants due to the catalyst or oil used on its synthesis, such as phosphorus, wich can damage the catalytic converter and cause significant increase in the particles emission. This project aims to develop na alternative method using chemically modified electrodes with iron nanoparticles for determination of phosphorus in biodiesel. For the formation of the iron nanoparticles film on the surface of a glassy carbon electrode, was used a iron sulfate solution. The film was formed after 10 successive cycles, with a scanning speed of 50 mV s-1 and a potential range of -0,9 to -1,25 V. To reduce possible oxides on the surface and activate the electrode, it has been subjected to a cathodic polarization with a potential of -1,25 V for 15 minutes in a sodium hydroxide solution. In cyclic voltammograms obtained in the study of the speed of scanning, there is an increase in the intensity of the anodic and cathodic current peaks. The cathodic peak current varied linearly with the square root of scan rate, showing that the electrode is controlled by diffusion. After successive additions of phosphate there is a linear variation in the current peak in the concentration range of 1,0 x 10-7 a 1,0 x 10-6 mol L-1. To determine if the concentration of phosphorus in real sample, the method of adding standard was used by adding aliquots of phosphate ions in the solution containing soy biodiesel extracted with ....
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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The treatment with overdenture supported by tooth consists in complete or partial removable prosthesis confection in which some satisfactory tooth are maintained and used to aiding retention associated with any retention system. The purpose of this case report is to show the use of magnet attachment in the confection overdenture to improve the oral rehabilitation in cases with restricted intermaxillary space. The treatment was considered successful by the patient and no need for excessive alteration in the prosthesis was required in the follow-up period of 6 months.
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The root resorption is one of the possible sequels of greater complexity to the orthodontist, the difficulty of detection and be asymptomatic. The presence, during the orthodontic treatment, is linked to a multifactorial origin, a complex combination of biological activities, anatomical, physiological, genetic variables and mechanical forces. Thus, the aim of this study was perform to critical literature review related to root resorption in orthodontic movement. Were included articles published between 2004 to 2014, indexed in the PUBMED database. Used descriptors contained in the Mesh, being adopted as inclusion criteria: clinical trials in humans, only articles that had clear ideas and objective, articles with English language. The search strategy used resulted in 24 articles and after applied the inclusion and exclusion criteria, 11 articles remained. Based on the results of this study it was concluded that heavy forces of intrusion, inclination and torque leads to a greater degree of root resorption; its etiology is multifactorial, the periodic radiographic control during treatment is needed and further studies are suggested to identify more specifically the causes and risk factors for root resorption.
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Objetivo: o objetivo desse estudo in vitro foi avaliar a infiltração marginal coronária após o preparo para retentor em dentes obturados com três diferentes cimentos, de acordo com o período entre a obturação do canal radicular e o preparo para retentor. Métodos: Noventa dentes humanos recentemente extraídos foram limpos e instrumentados e, então, obturados com Sealapex, Endométhasone ou TopSeal. Brocas Gates-Glidden foram utilizadas para o preparo imediato de 10 dentes de cada cimento até manter 5mm de obturação remanescente. Sessenta raízes obturadas foram incubadas a 37°C em meio úmido por 30 e 60 dias para serem, depois, preparadas para os retentores como descrito anteriormente. A superfície externa de cada raiz foi coberta com Araldite. Os espécimes foram imersos em corante azul de metileno a 2% sob vácuo por 24h, para então poderem ser analisados. A infiltração foi mensurada pelo software Sigma Scan da parte superior da obturação à porção apical alcançada pelo corante. Resultado: o Sealapex e o TopSeal apresentaram menor infiltração após o preparo para retentor do que o Endométhasone. O preparo imediato para o retentor apresentou menor infiltração do que o preparo para o retentor após 30 e 60 dias da obturação do canal radicular.
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O cementoblastoma é uma neoplasia benigna que envolve dentes vitais, frequentemente os molares ou pré molares inferiores. Está associado à raiz dentária podendo provocar a sua reabsorção. Cresce muito lentamente e é assintomático, com exceção dos casos em que há expansão das corticais. Radiograficamente aparece como uma massa radiopaca, bem definida, com contorno radiolúcido, que se sobrepõe à raiz do dente. O diagnóstico final normalmente é feito pelo exame histopatológico, mas o diagnóstico clínico é facilmente realizado, através da avaliação radiográfica. Paciente leucoderma, do sexo masculino, 54 anos realizou uma radiografia panorâmica digital para uma avaliação geral. Na imagem, foi observada uma massa radiopaca, bem delimitada, medindo aproximadamente 2 cm de diâmetro envolvendo as raízes do dente 47. Para uma melhor avaliação do caso, foi realizada uma tomografia de feixe cônico, onde foi observada que a massa radiopaca estava aderida às raízes do dente 47, causando reabsorção externa das mesmas, apresentando as dimensões de aproximadamente 2,7 cm no sentido ântero-posterior, 2 cm da base da mandíbula em direção à cortical alveolar e 1,7 cm de vestibular para lingual. Foi também observada expansão da cortical óssea lingual, sem rompimento. O diagnóstico por meio da tomografia foi de cementoblastoma. Devido à idade do paciente e a ele não apresentar sintomatologia, foi proposto o acompanhamento da lesão. O paciente encontra-se em proservação há 18 meses e não houve alteração do quadro clínico.
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Metidos a movimentação dentária induzida. Métodos: utilizou-se 30 ratos Wistar, divididos em três grupos (GI, GII e GIII), compostos por 10 animais cada e sacrificados, respectivamente, 7, 14 e 21 dias após o início do experimento. Os valores médios individuais dos grupos experimentais foram comparados com seu respectivo controle por meio do teste Mann-Whitney. Comparou-se, também, os valores entre regiões em um mesmo período de tempo e, ainda, entre períodos de tempo diferentes em uma mesma região através da Análise de Variância (ANOVA), Kruskal-Wallis e subsequente teste de Tukey. Resultados: os grupos GI e GII exibiram a dimensão do LPD diminuída nas regiões apical da raiz mesiovestibular e cervical da raiz distovestibular, e aumentada nas regiões cervical da raiz mesiovestibular, apical da raiz distovestibular e média de ambas as raízes. Conclusão: a diminuição e o aumento da dimensão do LPD evidenciada em uma mesma raiz — mesiovestibular ou distovestibular —, caracterizou o movimento dentário no sentido de inclinação. As três regiões, apical, média e cervical, comparadas entre si em cada período de tempo, bem como os três períodos de tempo, 7, 14 e 21 dias, comparados entre si em cada região, confirmaram o movimento de inclinação em GI e GII, e a diminuição gradual da intensidade dos fenômenos de GI para GII, até o restabelecimento da normalidade dimensional em GIII.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)