Comportamento cinético do cloro livre em meio aquoso e formação de subprodutos da desinfecção

One indirect approach to predict the disinfection by-product (DBP) formation potential for a given water source is by evaluation of the kinetic behavior of free chlorine in the liquid phase and chlorine demand determination for different operation conditions of the chlorination process. The objective of this work was to evaluate the kinetic behavior of free chlorine in water or a number of different raw water sources, as well as to investigate the impact of the coagulation process on chlorine demand reduction and DBP formation. It was observed that the higher the total organic carbon (TOC) removal efficiency through coagulation, the lower the liquid phase chlorine demand. Regarding trihalomethane (THM) formation, a ratio of 28 ug/L formed per mg/L of applied chlorine was observed for the waters employed in the experimental investigation.

Toxicidade aguda do sulfato de cobre e do extrato aquoso de folhas secas de nim para o caramujo (Pomacea canaliculata)

Snails can become an environmental and economic problem, causing substantial losses. The objective of this work was to estimate the acute toxicity of copper sulfate pentahydrate (CuSO4.5H2O) and the aqueous extract of dried neem leaves on snails (P. canaliculata) under laboratory conditions. In order to estimate the lethal concentration 50% (LC (I)50;96h), snails were exposed to six increasing copper sulfate concentrations (0.0; 0.01; 0.03; 0.05; 0.07 and 0.1 mg L-1) and six increasing concentrations of aqueous extract of dried neem leaves 0.0; 100; 125; 150; 175 and 200 mL aqueous extract of dried neem leaves L-1 water, equivalent to (0.0; 1.18; 1.47; 1.77; 2.06 and 2.36 mg azadirachtin L -1), in triplicate and one control treatment in an entirely random delineation. Estimated LC (I)50;96h, of copper sulfate was 0.02 mg copper sulfate L-1, with a 0.01 mg L-1 lower limit and a 0.03 mg L-1 upper limit. Estimated lethal concentration 50% of the aqueous extract of dried neem leaves was 142.75 mL L-1, equivalent to 1.68 mg L-1 of azadirachtine, with a 130.89 mL L-1 (1.54 mg L-1) low limit and 155.69 mL L-1 (1.83 mg L -1) as the upper limit.

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.

Eficácia do extrato aquoso do Triticum vulgare no tratamento de radiodermatites geradas pelo uso da radioterapia em gatos

The use of ionizing radiation in the treatment of oncological diseases in veterinary medicine has grown in recent years. In general, these animals are very well tolerated by the treatment with radioactive elements; however, the harmful effects that may occur are not always able to be controlled, particularly those relating to skin burns. Then, the purpose of this study was to evaluate the effects of aqueous extract of Triticum vulgare in treat of 10 cats radiodermatitis with squamous cell carcinoma (SCC), which were treated with radiotherapy as single modality treatment. The drug was used topically and daily until complete healing of wounds. Based on the findings, it may concluded beneficial effects of the drug, because it allowed the formation of granulation tissue and epithelization of wounds with epidermal repair not exuberant, good-quality cosmetics and, considering the deleterious effects that can result from cancer treatments.

Concentração letal LC50 do extrato aquoso de folhas de terminalia catappa em guaru, phalloceros caudimaculatus

This trial was conducted in order to determine the 50% lethal concentration (LC (I) 50-96h) of the aqueous extract of dried leaves of Terminalia catappa, a plant with antifungal, antibacterial and antiparasitic activity. Due to the increasing use of herbal medicines in aquaculture, its use is an option for controlling diseases in fish. Toxicity tests are important before recommending any treatment, since some products have therapeutic concentration close to lethal. To conduct the study used 135 fish species Guarus (Phalloceros caudimaculatus), exposed to increasing concentrations of: 0.0, 50.0, 100.0, 150.0, 200.0, 250.0, 300.0 mL of stock solution per liter of water. The results were calculated by the method Trimmed Spearman Karbo, demonstrating that the 50% lethal concentration (LC (I) 50-96h) estimated was 208.52 mL / L, with lower limit of 187.79 mL / L and higher 231.54 mL / L. Observed changes in behavior of the test organisms at concentrations above 250 mL / L decrease in the levels of dissolved oxygen and pH. Concentrations below 250 mL /L result in mortality rate near zero, so the aqueous extract shown low toxicity.

Efeito de cultivares de repolho e doses de extrato aquoso de nim na alimentação e biologia de Plutella xylostella (linnaeus) (lepidoptera: Plutellidae)

The isolated and associated effects of cabbage cultivars Ruby Ball and Chato de Quintal and aqueous extract of seeds of fruits of neem (Azadirachta indica A. Juss.) were evaluated in the concentrations of 5 and 10% on Plutella xylostella (L.) attractiveness, feeding and development. In free-choice no-preference for feeding test, leaf discs of each treatment were placed in Petri dishes where three caterpillars/treatment were released while in no-choice test two caterpillars were placed in Petri dishes with one leaf disc in each dish. In the biology test, neonate larvae were transferred to Petri dishes in the proportion of one per dish, whereas the biological parameters were evaluated: larvae mortality after 1, 3 and 5 days; pupae mortality; total mortality; six day-old larvae weight; 24 hour-old pupae; and adult longevity. Cultivar Ruby Ball showed lower attractiveness to the caterpillars in free-choice test. Neem extract in both concentrations was repellent to the caterpillars in free-choice test. There were no differences in the dry mass consumed by the caterpillars in free-choice and no-choice tests. There were no differences in larval, pupal and total mortality between the cultivars. Both doses of neem extract were equally efficient in the mortality of the diamondback moth. There were no differences in caterpillars and pupae weight and in the longevity of the adults of P. xyostella between the cultivars.

Salga e dassalga de peixes: aspectos químicos, físicos e efeito antioxidante do extrato aquoso de manjericão (Ocimum basilicum)

Pós-graduação em Aquicultura - FCAV

Obtenção de extrato aquoso solúvel de tremoço amargo (Lupinus campestris)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Tecnologia para produção de extrato aquoso de amendoim e elaboração de produto fermentado

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Otimização para a obtençao de extrato aquoso de tremoço branco (Lupinus albus L.) adicionado de suco de pitanga

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Ação de extratos aquoso e alcoólico de própolis sobre Malassezia spp isoladas do conduto auditivo de cães

Pós-graduação em Medicina Veterinária - FMVZ

As formas do humor. Copi: um caso argentino

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Efeito do extrato aquoso de Casearia sylvestris sobre a neutralização e regeneração da mionecrose induzida pelo veneno da Bothrops jaracussu em camundongos: estudo morfológico e funcional

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Aplicação de sílica organicamente modificada em sistema de extração em fase sólida de íons Cu(II), Cd(II) e Pb(II) em meio aquoso

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Micro-extração em fase sólida de Cu(II) e Cd(II) em meio aquoso utilizando sílica organicamente modificada para quantificação por espectrometria de absorção atômica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)