998 resultados para Atividade em trânsito


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FUNDAMENTO: Vários mecanismos têm sido propostos contribuir para a disfunção cardíaca em modelos de obesidade, tais como alterações nas proteínas do trânsito de cálcio (Ca+2) e nos receptores beta-adrenérgicos. Todavia, o papel desses fatores no desenvolvimento da disfunção miocárdica induzida pela obesidade ainda não está claro. OBJETIVO: Este estudo pretende investigar se a obesidade induzida por um ciclo de dieta hipercalóricas resulta em disfunção cardíaca. Além disso, foi avaliado se essa alteração funcional em ratos obesos está relacionada com o prejuízo do trânsito de Ca+2 e do sistema beta-adrenérgico. MÉTODOS: Ratos Wistar machos, 30 dias de idade, foram alimentados com ração padrão (C) e um ciclo de cinco dietas hipercalóricas (Ob) por 15 semanas. A obesidade foi definida pelo aumento da porcentagem de gordura corporal dos ratos. A função cardíaca foi avaliada mediante análise isolada do músculo papilar do ventrículo esquerdo em condições basais e após manobras inotrópicas e lusitrópicas. RESULTADOS: Em comparação com o grupo controle, os ratos obesos apresentaram aumento da gordura corporal e intolerância a glicose. Os músculos dos ratos obesos desenvolveram valores basais semelhantes; entretanto, as respostas miocárdicas ao potencial pós-pausa e aumento de Ca+2 extracelular foram comprometidas. Não houve alterações na função cardíaca entre os grupos após a estimulação beta-adrenérgica. CONCLUSÃO: A obesidade promove disfunção cardíaca relacionada com alterações no trânsito de Ca+2 intracelular. Esse prejuízo funcional é provavelmente ocasionado pela redução da atividade da bomba de Ca+2 do retículo sarcoplasmático (SERCA2a) via Ca+2 calmodulina-quinase.

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n this work, we analyze the behavior of the chromospheric and coronal activities as a function of the mass and the orbital period of extrasolar planets which were detected by transit technique. So we look for possible effects of the planet on the star s chromosphere and corona. For this study we selected a sample of 48 stars with chromospheric activity indicator and 23 with coronal activity indicator. Our work is based on the work from Pont et al. (2011) in order to study stars with planets which were obtained by transit technique. Furthermore, we studied the relationship between planetary mass and orbital period with the chromospheric and coronal activity in order to better understand which influences the planets cause in the outer layers of stellar atmosphere. In our analysis we can observe that the mass of the planets exerts no influence in the stellar activity. However, we observed that the stellar coronal and chromospheric activities decrease with the increase of the orbital period of the planet

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In this work, we analyze the behavior of the chromospheric and coronal activities as a function of the mass and the orbital period of extrasolar planets which were detected by transit technique. So we look for possible effects of the planet on the star s chromosphere and corona. For this study we selected a sample of 48 stars with chromospheric activity indicator and 23 with coronal activity indicator. Our work is based on the work from Pont et al. (2011) in order to study stars with planets which were obtained by transit technique. Furthermore, we studied the relationship between planetary mass and orbital period with the chromospheric and coronal activity in order to better understand which influences the planets cause in the outer layers of stellar atmosphere. In our analysis we can observe that the mass of the planets exerts no influence in the stellar activity. However, we observed that the stellar coronal and chromospheric activities decrease with the increase of the orbital period of the planet

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Biologia Geral e Aplicada - IBB

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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A atividade profissional dos motoboys é um fenômeno urbano – especialmente, das grandes cidades brasileiras – bastante recente e cada vez mais integrada à paisagem urbana de São Paulo. Devido ao seu rápido e exponencial crescimento, aliado à dinâmica e a natureza de sua atividade profissional – que se vale de uma motocicleta para realizar entregas e coletas rápidas de mercadorias e documentos dos mais diversos –, que os motoboys passam a ser alvos certos e constantes nas mais diversas controvérsias no trânsito paulistano. É neste sentido que se enseja desmistificar o surgimento dessa atividade profissional para além de um sentido de espontaneidade, como também, problematizar o foco de sua dinâmica ligado aos conflitos no trânsito. Assim, esta atividade profissional que se traduz como produto e necessidade de um contexto histórico de fin de siècle, revela parte das transformações sócio-espaciais na cidade de São Paulo na transição do século XX para o XXI, encarnando dois pólos de um mesmo problema a partir da nova condição da cidade e do mundo do trabalho, denotando novos usos e intensidade de circulação no espaço urbano, bem como, elevando em outro patamar os conflitos e acidentes no trânsito paulistano.

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The composition and biological activities of propolis, a resinous hive product collected by honeybees from various plant sources, depends on various factors such as season and vegetation of the area. The aim of this study was to evaluate the influence of the seasonal effect on the ethanolic extracts of Brazilian propolis (EEP) type 6 and type 12, collected during 6 months in terms of antibacterial activity and phenolic composition. The antimicrobial properties were evaluated by MIC and MBC on S. mutans Ingbritt 1600 and the profile of chemical composition by UV-visible spectrophotometry, HPLC-RF and GC-MS. The results demonstrated that the season in which propolis is collected influences its chemical composition, resulting in modifications in its antibacterial activity.

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The input of agrochemicals in the aquatic compartment can results in biochemical injuries for living organisms. In this context, the knowledge of alterations of enzymatic activities due the presence of agriculture pollutants contributes for the elucidation of the mechanisms of toxicity, implementation of economic methods for monitoring purposes and establishment of maximum allowed concentrations. In the present work, the above considerations are discussed, and data concerning changes in enzymatic function by pesticides and fertilizer contaminants are reviewed. Also, we focused on the acid phosphatase due its susceptibility to several pollutants and diversity in cellular functions.

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Multidrug resistance, MDR is a major obstacle for cancer chemotherapy. MDR can be reversed by drugs that vary in their chemical structure and main biological activity. Many efforts have been done to overcome MDR based on studies of structure-activity relationships and in this review we summarize some aspects of MDR mediated by P-glycoprotein (P-gp), as the most experimentally and clinically tested form of drug resistance. The most significant MDR mechanisms revealed until now are shortly discussed. Physicochemical and structural properties of MDR modulators, measures of the MDR reversal, and QSAR studies are included.

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Activity guided fractionation of Sinningia allagophylla (Mart.) Wiehler ethanolic extract yielded a new benzochromene 8-methoxylapachenol, besides seven known compounds: lapachenol, sitosteryl oleate, sitosteryl linoleate, stigmasteryl oleate, stigmasteryl linoleate, dunniol and tectoquinone. Extract, fractions, and compounds lapachenol, 8-methoxylapachenol, and dunniol were tested in vitro against human cancer cell lines U251 (glioma, CNS), MCF-7 (breast), NCI-ADR/RES (drug-resistant ovarian), 786-0 (kidney), NCI-H460 (lung, no small cells), PC-3 (prostate), OVCAR-3 (ovarian), HT-29 (colon), K562 (leukemia) and against VERO, a normal cell line. The most active compound was dunniol, which inhibited the growth of U251, MCF-7, NCI-ADR/RES, OVCAR-3 and K562 cell lines.

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Arrabidaea chica (H&B) Verlot is a plant popularly known as Pariri and this species is a known source of anthocyanins, flavonoids and tannins. This report describes an approach involving enzymatic treatment prior to extraction procedures to enhance A chica crude extract anticancer activity. Anticancer activity in human cancer cell lines in vitro using a 48 h SRB cell viability assay was performed to determine growth inhibition and cytotoxic properties. The final extraction yield without enzyme treatment was higher (24.28%) compared to the enzyme-treated material (19.03%), with an enhanced aglycones anthocyanin ratio as determined by HPLC- DAD and LC-MS with direct infusion.

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Our aim was to verify the influence of a physical activities proposal in the quality of life and self image of incontinent women. This study was comparative and exploratory and was developed in 16 weeks. Thirty-seven women with and without urinary incontinence (IU) participated in the study. After the study, significant improvement in general health perception (p < 0.001), UI impact (p = 0.035), physical limitations (p = 0.015), personal relations, (p = 0.048), sleep and disposition (p = 0.012) and concerned with the gravity measurements (p = 0.011) was observed. Concerning self image, alterations in appearance were not observed; however, concerning body satisfaction, the women felt less satisfied with their bodies (p = 0.007). There was a reduction in the number of regions where they felt pain (p = 0.0003) and that they did not like (p = 0.0017). In conclusion, the Physical Education professionals using a systematized and integrated physical activities program can lead the women with IU to significant improvement in the perception of their quality of life and health concerning their self image with improvement of the IU symptoms and reduction of frequency and amount of urinary loss.