949 resultados para dirhenium(III,II)


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Este artigo analisa os trabalhos apresentados nos I, II e III Encontrosde Pesquisa em Educação Ambiental (EPEAs). Tem como corpusdocumental 61 trabalhos, definidos através de uma amostragem aleatóriaestratificada a partir das edições dos eventos. Seus objetivos são: ainvestigação do entendimento dado à dimensão política da educaçãoambiental, a caracterização das concepções de educação ambiental e aidentificação das abordagens políticas dessas concepções. Trata-se de umaanálise documental de abordagem qualitativa. A análise foi realizadaatravés das categorias: concepção emancipatória de educação, concepçãotransformadora da relação sociedade-natureza (que configuram umaconcepção transformadora de EA), concepção conservadora de educaçãoe concepção conservadora da relação sociedade-natureza (que definemuma concepção conservadora de EA). Sessenta e quatro por cento dostrabalhos foram compreendidos como concepção transformadora e os36% restantes foram considerados portadores de uma concepçãoconservadora. Dos 61 trabalhos, 18 relacionam educação ambiental com adimensão política.

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Com a disseminação da agricultura industrial, com grande utilização de insumos tecnológicos, mecanizada e fundamentada num número reduzido de espécies e variedades de plantas cultivadas, os modos de produção autóctone têm sofrido pressões em todo mundo. Entre estas, citam-se a modernização do campo, a perda de terras para agricultura comercial em larga escala e a emigração dos jovens em busca de melhores condições de vida, que acarretam grandes mudanças para estes sistemas agrícolas. As comunidades de agricultores de subsistência são detentoras de uma gama de variedades de diversas espécies cultivadas, sendo que essa diversidade é um fator adaptativo importante para o agricultor ante as variações ambientais, climáticas, biológicas e socioeconômicas, além de ser importante para a segurança do sistema alimentar mundial. Isto faz com que estes agricultores se tornem importantes parceiros para programas de conservação in situ de plantas cultivadas. No Brasil, assentamentos rurais são formados por agricultores de diversas origens, e são locais onde a agricultura é parcialmente voltada para a subsistência. Dentre a grande diversidade de plantas cultivadas para subsistência, as raízes e os tubérculos constituem, depois dos cereais, a principal fonte de alimento para a população humana. O presente estudo visou levantar as espécies de raízes e tubérculos cultivados nos Assentamentos Rurais Araras I, II, III e IV, no município de Araras, São Paulo, e analisou a potencialidade dos pequenos agricultores das assentamentos como mantedores de agrobiodiversidade. A pesquisa se deu através de entrevistas estruturadas e semi-estruturadas, onde os agricultores entrevistados forma selecionados de maneira aleatória e estratificada entre os quatro assentamentos. Os dados coletados foram analisados de maneira descritiva. Os resultados...(Resumo completo, clicar acesso eletrônico abaixo)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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The purpose of this study is to make a 3-dimensional (3-D) evaluation of the pharyngeal airway space (PAS) in patients with class I, II, and III malocclusion. Sixty patients were evaluated. The patients were divided in 3 groups according to their occlusion classification. The volume and area of PAS were evaluated using the software Dolphin 3-D Imaging in the preoperative period for orthognathic surgery. PAS volume and area were influenced by different patterns of malocclusion. The mean volume and area for class III patients were statistically bigger than for classes I and II patients (P < .001). There was also a significant difference for volume values between class I and II patients, being the bigger volume for the class I patients (P < .05). It was possible to conclude that the class III patients presented a bigger PAS compared with classes I and II patients.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Aim: compare the evaluation of orthodontics and lay people on facial attractiveness of pattern II and III subjects. Methodology: thirty orthodontists and 30 laymen judged a profile facial photos of 64 subjects standard II and III (34 standard II e 30 standard III), making as visual analogical scale (VAS) with 10 cm. Results: after evaluation, the results were submitted to a statistics analysis (Mann- Whitney test) showed that the groups of evaluators orthodontists and lay people differed in their assessments, and these differences are statistically significant. Conclusions: the laymen was more rigorous than orthodontics, and both considered the female pattern III more agradable.

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Purpose Cediranib is a highly potent inhibitor of vascular endothelial growth factor (VEGF) signaling with activity against all three VEGF receptors. HORIZON II [Cediranib (AZD2171, RECENTIN) in Addition to Chemotherapy Versus Placebo Plus Chemotherapy in Patients With Untreated Metastatic Colorectal Cancer] assessed infusional fluorouracil, leucovorin, and oxaliplatin/capecitabine and oxaliplatin (FOLFOX/CAPOX) with or without cediranib in patients with previously untreated metastatic colorectal cancer (mCRC). Patients and Methods Eligible patients were initially randomly assigned 1:1:1 to receive cediranib (20 or 30 mg per day) or placebo plus FOLFOX/CAPOX. In an early analysis of this and two other cediranib studies (HORIZON I [Cediranib Plus FOLFOX6 Versus Bevacizumab Plus FOLFOX6 in Patients With Previously Treated Metastatic Colorectal Cancer] and HORIZON III [Cediranib Plus FOLFOX6 Versus Bevacizumab Plus FOLFOX6 in Patients With Untreated Metastatic Colorectal Cancer]), the 20-mg dose met the predefined criteria for continuation. Subsequent patients were randomly assigned 2: 1 to the cediranib 20 mg or placebo arms. Progression-free survival (PFS) and overall survival (OS) were coprimary end points. Results In all, 860 patients received cediranib 20 mg (n = 502) or placebo (n = 358). The addition of cediranib to FOLFOX/CAPOX resulted in PFS prolongation (hazard ratio [HR], 0.84; 95% CI, 0.73 to 0.98; P = .0121; median PFS, 8.6 months for cediranib v 8.3 months for placebo) but had no impact on OS (HR, 0.94; 95% CI, 0.79 to 1.12; P = .5707; median OS, 19.7 months for cediranib v 18.9 months for placebo). There were no significant differences in the secondary end points of objective response rate, duration of response, or liver resection rate. Median chemotherapy dose-intensity was decreased by approximately 10% in patients treated with cediranib. Adverse events (AEs) associated with cediranib were manageable. Conclusion Addition of cediranib 20 mg to FOLFOX/CAPOX resulted in a modest PFS prolongation, but no significant difference in OS. The cediranib AE profile was consistent with those from previous studies. Because of the lack of improvement in OS, cediranib plus an oxaliplatin-based regimen cannot be recommended as a treatment for patients with mCRC. J Clin Oncol 30:3596-3603. (C) 2012 by American Society of Clinical Oncology

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Masticatory efficiency may be impaired in individuals with dentofacial deformities. The objective of the present study was to determine the condition of masticatory efficiency in individuals with dentofacial deformities. 30 patients with class II (DG-II) and 35 patients with class III (DG-III) dentofacial deformity participated in the study, all had an indication for orthognathic surgery. 30 volunteers (CG) with no alterations of facial morphology or dental occlusion and with no signs or symptoms of temporomandibular joint dysfunction also participated. Masticatory efficiency was analysed using a bead system (colorimetric method). Each individual chewed 4 beads, one at a time, over 20 s measured with a chronometer. The groups were compared in term's of masticatory efficiency using analysis of variance (ANOVA), with the level of significance set at P < 0.05. Masticatory efficiency was significantly greater in CG (P < 0.05) than in DG-II and DG-III in all chewing tasks tested, with no significant difference between DG-II and DG-III (P > 0.05). It was observed that the presence of class II and class III dentofacial deformity affected masticatory efficiency compared to CG, although there was no difference between DG-II and DG-III.

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The known paddlewheel, tetrakis(acetato)chloridodiruthenium(II,III), offers a versatile synthetic route to a novel class of antitumor diruthenium(II,III) metallo drugs, where the equatorial ligands are nonsteroidal anti-inflammatory carboxylates. This complex was studied here as a soluble starting prototype model for antitumor analogues to elucidate the reactivity of the [Ru-2(CH3COO)(4)](+) framework. Thermodynamic studies on equilibration reactions for axial substitution of water by chloride and kinetic studies on reactions of the diaqua complexes with the amino acids glycine, cysteine, histidine, and tryptophan were performed. The standard thermodynamic reaction parameters Delta H degrees, Delta S degrees, and Delta V degrees were determined and showed that both of the sequential axial substitution reactions are enthalpy driven. Kinetic rate laws and rate constants were determined for the axial substitution reactions of coordinated water by the amino acids that gave the corresponding aqua(amino acid)-Ru-2 substituted species. The results revealed that the [Ru-2(CH3COO)(4)](+) paddlewheel framework remained stable during the axial ligand substitution reactions and was also mostly preserved in the presence of the amino acids.