Validação das unidades arbitrárias de teor de clorofilas obtido em folhas intactas de seringueira

The determination of foliar chlorophyll content is a characteristic that interests ecophysiologists and rural producers. With consideration for practical uses as well as scientific publications, our present work aims to establish equations, for rubber tree leaves, that can convert arbitrary units of expressing chlorophyll content to the international system. Chlorophyll a (Chla), chlorophyll b (Chlb), and total chlorophyll (Chltot) were obtained from intact leaves using a portable chlorophyll detecting instrument. Leaves from different positions on the plant, at various stages of maturity, and representing a large spectrum of pigment concentrations, were collected and analyzed in the field using the Clorofil OG Falkner ® instrument, through four evaluations in forty-five medium leaflets. At the laboratory, leaflets underwent a process of pigment extraction. They were incubated in a water-bath with dimethylsulfoxide (DMSO), dosed in molecular absorption spectrophotometer, and converted into pigment content per unit of fresh weight using conventional equations. The data were evaluated according to the Pearson correlation coefficient and tested with different regression models. For all variables, the linear fit is the most adequate, with correlation coefficients (r) 0.74 for Chlb and 0.88 for Chla and Chltott.

Validação das unidades arbitrárias do teor de clorofilas obtido em folhas intactas de seringueira

The determination of foliar chlorophyll content is a characteristic that interests ecophysiologists and rural producers. With consideration for practical uses as well as scientific publications, our present work aims to establish equations, for rubber tree leaves, that can convert arbitrary units of expressing chlorophyll content to the international system. Chlorophyll a (Chla), chlorophyll b (Chlb), and total chlorophyll (Chltot) were obtained from intact leaves using a portable chlorophyll detecting instrument. Leaves from different positions on the plant, at various stages of maturity, and representing a large spectrum of pigment concentrations, were collected and analyzed in the field using the Clorofil OG Falkner ® instrument, through four evaluations in forty-five medium leaflets. At the laboratory, leaflets underwent a process of pigment extraction. They were incubated in a water-bath with dimethylsulfoxide (DMSO), dosed in molecular absorption spectrophotometer, and converted into pigment content per unit of fresh weight using conventional equations. The data were evaluated according to the Pearson correlation coefficient and tested with different regression models. For all variables, the linear fit is the most adequate, with correlation coefficients (r) 0.74 for Chlb and 0.88 for Chla and Chltott .

Gestão do ouro azul no contexto globalizado Neoliberal: bem econômico ou bem social?

The neoliberalism based on the Washington Consensus advised privatization as the most effective alternative for the management of natural resources. The question is what is prioritizing efficiency, market or welfare? The growing concern about the water issue has been highlighted in discussions in international policy debates, and what it turns out is the prominence of corporate and economic interests over social and environmental. The water is in crisis, there are several sources of popular conflicts around the world contrary to how this resource is being offered, as the Water War occurred in 2000 in the city of Cochabamba. It is necessary to respect its limitations to ensure their future availability and choose the best development model that favors the effectiveness of their control. The international proliferation of commercial vision concerning water stipulated privatization of their management as ideal rule, which increased rates, concentrated income, has not improved the quality nor promoted the conquest of equal access to water for most systems that provides these services, this is, privatization has not brought positive results that outweigh the harm of its implementation. Water is an essential commodity for life of living beings, in all its stages, basic reason to develop plans, rules and commitments that ensure its conservation and provide, as soon as possible, a valid alternative for the sustainable management in long term

Atividade anti-Helicobacter pylori de extratos hidroetanólicos de caule e folhas de Astronium fraxinifolium e Astronium graveolens

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

Potencial anti-Helicobacter pylori de extratos hidroetanólicos de caule e folhas de Astronium urundeuva

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

Extrato hidroetanólico das folhas de Eugenia Aurata e de Eugenia Punicifolia (HBK) inibe a migração neutrofílica por mecanismos distintos

Pós-graduação em Biociências - FCLAS

Fitotoxicidade e análise fitoquímica a partir de folhas de cinco espécies de Cerrado

Pós-graduação em Biociências - FCLAS

Estudo fitoquímico de extratos polares e infusão das folhas de Terminalia catappa L. (Combretaceae) e avaliação de suas atividades antiulcerogênica e mutagênica

Pós-graduação em Química - IQ

Avaliação do potencial citotóxico, moluscicida e alelopático dos extratos hidroetanólicos das folhas de Stryphnodendron obovatum Benth

Stryphnodendron obovatum Benth. known as barbatimão de folha miúda, is a typical tree of the Midwest and Southeast “Cerrado” regions of Brazil. Several secondary metabolites have been identified in its barks, including tannins, described on the literature as allelochemicals. Beholding to identify a possible allelopathic activity in S. obovatum leaves, we tested hydroethanolic EtOH:H2 O (70% and 50% v/v) extracts, in different concentrations, on the initial development of cucumber (Cucumis sativus L.). Among the results, we highlight the effect of the 50% hydroethanolic extract in inhibiting the formation of the main and the secondary roots and the stimulation of the hypocotyl growth in C. sativus by the 70% hydroethanolic extract, both in all concentrations tested. The cytotoxic activity, evaluated by bioassay toxicity on Artemia salina Leach., was negative for the tested extracts (LC50> 1000 mg.mL-1). Concomitantly, the molluscicidal activity, evaluated against snails of Biomphalaria glabrata Say, presented low acute toxicity of solutions of 70% hydroethanolic extract at concentrations of 128.9 mg.mL-1 and 172.8 mg.mL-1 and values above 250 mg.mL-1 to solutions of 50% hydroalcoholic extract, being therefore considered inactive for these. The results suggest the existence of allelochemicals in the extracts tested and they have low toxicity.

Em busca do sentido: uma análise das estratégias de processamento textual em O milagre das folhas, de Clarice Lispector

This text aims to elucidate the textual processing strategies that give meaning to chronicle "The miracle of the leaves", of Clarice Lispector (1920-1977). Therefore, it starts from the basic postulate that the meaning is not in the fabric or verbal imagery, but the meanings constructed from the elements of language that are there to meet with the reader (BRONCKART, 2009, p. 257). Justified this reading strategy, since the chronic Lispector reveals multiple meanings endowed with a language and dialogue. The text processing is discussed in terms of an audience potentially youthful element that assigns characteristics relevant to the understanding of the functioning of this type of text in relation to younger readers. To achieve the goal, we start from the assumption that chronic, being a literary text endowed with aesthetic validity, not only conveys a content, but recreates it, adding to it new meanings.

Degradabilidade ruminal da matéria seca de folhas e colmo de genótipos de Cynodon spp. em quatro idades de rebrota

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Determinação da matéria seca e teores de macronutrientes em folhas de frutíferas usando diferentes métodos de secagem

O objetivo desse estudo foi avaliar diferentes métodos de secagem de folhas para três diferentes frutíferas (maracujá, pêssego e abacate), com relação à determinação da matéria seca e os teores foliares de macronutrientes. Foram coletadas amostras de folhas recém expandida de três culturas, do pomar da fazenda de ensino e pesquisa da FCAV-UNESP, câmpus de Jaboticabal, no mês de janeiro de 2010, coletando-se para cada cultura 12 amostras com 25 folhas cada. Os tratamentos constituíram-se por dois métodos de secagem, estufa de circulação de ar forçada regulada a uma temperatura de 70°C e o forno microondas (FMO). Avaliou-se a massa da matéria seca e os teores foliares de macronutrientes. Os resultados sugerem que os dois métodos de secagem testados se assemelham na determinação de matéria seca e nos teores foliares de macronutrientes para as culturas análisadas, exceto os teores de cálcio na cultura do pêssego.

Avaliação da atividade antioxidante, fotoprotetora e antiglicante dos extratos das folhas e flores de Moringa oleifera

Pós-graduação em Biociências - FCLAS

Filmes de nanocompósitos de polímero condutor, nanopartículas de argila e nanopartículas de ouro para aplicação em sensores ambientais

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