Efeito hipocolesterolêmico dos ácidos caféicos da própolis

Natural products have been used in tratamed of hypercholesterolemia. The bee products have been promoting up the man's interest, among them it stands out the propolis, coleted by bees, rich in polyphenols. The biggest polyphenols of propolis was flavonoids and caffeic acids, which have antioxidant power, presenting the protective action to the lipoprotein LDL-cholesterol against the lipid peroxidation. Therefore, the present work was evaluated whether the caffeic acids of the Botucatu's propolis (Botucatu-SP) affect the levels of plasma cholesterol, in rabbits submitted to the rich diet in cholesterol. The animals were divided in three groups: C (n=2) they received commercial ration and water for the whole period; S (n=2) they received normal ration and water in the first period and supplemented ration and water in the second and third periods; S+T (n=5) they received normal ration and water in the first period, supplemented ration and water in the second period and supplemented ration and extract rich in caffeic acids in the third period. The caffeic acids were administered diluted in water, being in the concentration of 0.05g caffeic acid mL -1 kg -1 of animal. Weekly, after fast of 14 hours, the samples of blood were collected from the marginal vein of the ear for determination of the plasma levels of total cholesterol and their fractions. The caffeic acids of the propolis reduced the plasma concentration of total cholesterol in 30% (280 for 199 mg dL -1) in the rabbits treated with flavonoids, while in the animals of the group S those levels were reduced discreetly (380 for 400 mg dL -1). The animals of the group C maintained this biochemical parameter in the normality range during the whole period (50 mg dL -1). Therefore, we concluded that the caffeic acids exert inhibititory activity in the metabolism of the cholesterol, being considered as a substance of action against the hypercholesterolemia.

Efeito de níveis de fósforo no crescimento inicial, biomassa e atividade in vivo da fosfatase ácida em Lychnophora ericoides Mart

The effect of phosphorus levels on seedling growth, dry and fresh matter production, and in vivo acid phosphatase activity was studied in Lychnophora ericoides cultivated during 130 days after transplanting in a greenhouse. Experimental design was completely randomized, with four P 2O 5 levels (0; 40; 80; 160 mg dm -3 as triple superphosphate) and five replicates of four plants each. The used soil was dystrophic acid dark red latosol. Lychnophora ericoides is responsive to phosphate fertilization with modification in daily relative growth rate, dry matter production and distribution among the plant parts. Acid phosphatase activity had significant and negative correlation with total, leaf and stem dry matter production, as well as with P levels accumulated in the leaf tissue. On the other hand, acid phosphatase activity had significant and positive correlation with root/shoot ratio.

Efeito hipotensor do extrato aquoso de alpiste (Phalaris canariensis L.) em ratos

The plant species Phalaris canariensis, known as canary grass, is widely used in folk medicine as diuretic, as well as in culinary and animal feed. In this study, the effect of P. canariensis aqueous extract (AE) on water flow (V) and sodium renal excretion (Qe (Na+)) was evaluated in anesthetized Wistar rats. Arterial pressure alterations (AP) were also assessed. Two groups were studied: Control group (CON) - oral administration of 1.0 mL distilled water, and Experimental group (EA) - oral administration of 1.0 mL P. canariensis aqueous extract 40%. Rats were anesthetized and subjected to cannulation of trachea (for better pulmonary ventilation), left carotid artery (for arterial pressure measurement) and urinary bladder (for urine collection). Control animals did not present significant alterations (p>0.05) in all analyzed parameters after water administration. EA group had a significant arterial pressure reduction at 60 minutes (31.4%) and 90 minutes (49.1%) after the extract administration (p<0.05). Renal parameters did not have any significant alteration (p>0.05). In this study, P. canariensis aqueous extract had a hypotensive effect in anesthetized Wistar rats, without renal alterations.

Sistemas de manejo e efeito residual do potássio na produtividade e nutrição do feijão-caupi

Cowpea [Vigna unguiculata (L) Walp] have great social and economic importance for the Para State. It grows well in areas with low precipitation and two crop cycles can be obtained annually. This study aimed to assess the effect of the residual fertilization from a previous culture (Sorghum bicolor L. Moench) and crop systems on cowpea yield and macronutrient concentration on leaves of three cowpea cultivars (BRSMilênio, BRS-Urubuquara e BRS-Guariba). The study was conducted at the UFRA. The treatments were two crop systems (minimum tillage and conventional), four levels of potassium (50, 100, 200 e 300 kg de KCl ha-1 applied to a previous sorghum culture) and the three cowpea cultivars. Treatments were organized as a three (4 x 2 x 3) factor experiment on a randomized complete block design. The soil was a yellow latosol. In each experiment plot five plants were selected to determine shoot dry matter and foliar nutrient concentration. Grain yield was determined after harvesting all plants on the experiment plot. The residual KCl fertilization affected foliar nutrient content, but did not affect shoot dry mass or yield of grain. Yield was higher in the minimum tillage system. Highest yield (1590 kg ha-1) was recorded int the cv. 'Guariba' when 100 kg of KCl ha-1 had been used in the previous crop. The highest content of leaf N and K was found in cowpea under minimum tillage system. The amount of P and Mg were higher in the conventional system whereas the amount of Ca did not change.

Uso de fitorreguladores e efeitos no florescimento de plantas de pinhão-manso e na maturidade fisiológica das sementes

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Vigor de sementes, população de plantas e desempenho agrônomico de soja

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Efeitos fisiológicos da piraclostrobina em plantas de feijão (Phaseolus vulgaris L.) condicionado sob diferentes tensões de água no solo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Persistência de palhada de plantas de cobertura em função de doses de silício e resposta do feijoeiro em sucessão

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Absorção e acúmulo de manganês em soja RR sob efeito do glyphosate

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

Efeito residual da aplicação superficial de calcário e gesso nas culturas de soja, aveia-preta e sorgo granífero

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

Persistência de cloreto de Mepiquat em plantas de algodão em função da precipitação

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

Produção de plantas de arroz sob a ação de silício e nitrogênio

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

Engenheiros dos ecossistemas em plantas: modificações arquiteturais de folhas por largatas de Lepidoptera influenciam a estrutura de comunidades de artrópodes

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

Estudo comparativo da ação antimicrobiana de extratos e óleos essenciais de plantas medicinais e sinergismo com drogas antimicrobiannas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeito da biomassa de espécie exótica (Brachiaria subquadripara (Trin.) Hitchc.) e nativa (Eichhornia azurea (SW. Kunth) sobre a estrutura da comunidade de macrófitas aquáticas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)