2,027 research outputs found
In Vitro
Jaboticaba is a fruit from a native tree to Brazil, Plinia peruviana. Jaboticaba peels are an important source of antioxidant molecules such as phenolic compounds. This study aimed to evaluate in vitro the activity of a hydroalcoholic extract of jaboticaba fruit peels (HEJFP) in wound healing processes and antioxidant activity in murine fibroblasts (L929 cell line). HEJFP concentrations (0.5, 1, 5, 10, 25, 50, 100, and 200â”g/mL) were tested in MTT assay and cell proliferation was verified at 100â”g/mL after 24âh and at 25, 50, and 100â”g/mL after 48âh of extract exposure. Evaluation of antioxidant activity was performed at 0.5, 5, 25, 50, and 100â”g/mL HEJFP concentrations. Cell treatment with HEJFP at 25, 50, and 100â”g/mL for 24âh followed by H2O2 exposure for 3âh showed a strong cytoprotective effect. In vitro scratch wound healing assay indicated that none of tested HEJFP concentrations (0.5, 5, 25, 50, and 100â”g/mL) were capable of increasing migration rate after 12âh of incubation. These results demonstrate a positive effect of HEJFP on the wound healing process on L929 fibroblasts cell line, probably due to the antioxidant activity exhibited by phytochemicals in the extract
Zinc loading in urea-formaldehyde nanocomposites increases nitrogen and zinc micronutrient fertilization efficiencies in poor sand substrate.
Agricultural output needs significant increases to feed the growing population. Fertilizers are essential for plant production systems, with nitrogen (N) being the most limiting nutrient for plant growth. It is commonly supplied to crops as urea. Still, due to volatilization, up to 50 % of the total N application is lost. Slow or controlled release fertilizers are being developed to reduce these losses. The co-application of zinc (Zn) as a micronutrient can increase N absorption. Thus, we hypothesize that the controlled delivery of both nutrients (N and Zn) in an integrated system can improve uptake efficiency. Here we demonstrate an optimized fertilizer nanocomposite based on urea:urea-formaldehyde matrix loaded with ZnSO4 or ZnO. This nanocomposite effectively stimulates maize development, with consequent adequate N uptake, in an extreme condition ? a very nutrient-poor sand substrate. Our results indicate that the Zn co-application is beneficial for plant development. However, there were advantages for ZnO due to its high Zn content. We discuss that the dispersion favors the Zn delivery as the nanoparticulated oxide in the matrix. Concerning maize development, we found that root morphology is altered in the presence of the fertilizer nanocomposite. Increased root length and surface area may improve soil nutrient uptake, potentially accompanied by increased root exudation of essential compounds for N release from the composite structure
Cor, educação e casamento: tendĂȘncias da seletividade marital no Brasil, 1960 a 2000
Utilização dos serviços de atendimento odontológico hospitalar sob sedação e/ou anestesia geral por pessoas com necessidades especiais no SUS-MG, Brasil
Relative contribution of expectancy and immediate arousal to the facilitatory effect of an auditory accessory stimulus
MECANISMOS EFICIENTES NA PRODUĂĂO DO FRACASSO ESCOLAR DE JOVENS NEGROS: ESTEREĂTIPOS, SILENCIAMENTO E INVISIBILIZAĂĂO
The early facilitatory effect of a peripheral spatially noninformative prime stimulus depends on target stimulus features
Neutrophil Paralysis in Plasmodium vivax Malaria
Plasmodium vivax is responsible for approximately 60â80% of the malaria cases in the world, and contributes to significant social and economic instability in the developing countries of Latin America and Asia. The pathogenesis of P. vivax malaria is a consequence of host derived inflammatory mediators. Hence, a better understanding of the mechanisms involved in induction of systemic inflammation during P. vivax malaria is critical for the clinical management and prevention of severe disease. The innate immune receptors recognize Plasmodium sp. and initiate a broad spectrum of host defense mechanisms that mediate resistance to infection. However, the innate immune response is the classic âtwo-edged swordâ, and clinical malaria is associated with high levels of circulating pro-inflammatory cytokines. Our findings show that both monocytes and neutrophils are highly activated during malaria. Monocytes produced high levels of IL-1ÎČ, IL-6 and TNF-α during acute malaria. On the other hand, neutrophils were a poor source of cytokines, but displayed an enhanced phagocytic activity and superoxide production. Unexpectedly, we noticed an impaired chemotaxis of neutrophils towards an IL-8 (CXCL8) gradient. We proposed that neutrophil paralysis is in part responsible for the enhanced susceptibility to bacterial infection observed in malaria patients
Impactos da assimetria de informação na estrutura de capital de empresas brasileiras abertas
- âŠ