Efeitos do citrato de sildenafila sobre a neuroprote����o na neuropatia ��ptica, em ratos (Lewis/SsNHsd) com glaucoma agudo

P��s-gradua����o em Cirurgia Veterin��ria - FCAV

Evaluation of roof slope and exposure with different roofing materials in reduced models of animal production facilities in spring and summer

Funda����o de Amparo �� Pesquisa do Estado de S��o Paulo (FAPESP)

Lewis Carroll, a educa����o e o ensino de geometria na Inglaterra vitoriana

Research partly motivated by Lewis Carroll's Euclid and his modern rivals (1879) portuguese translation, this paper presents some hermeneutical remarks taken as necessary to understand the context in which such book was produced. The paper focuses particularly on education, in general, and on the teaching of mathematics and Geometry in victorian England.

Effects of a Mixture of Pesticides on the Adult Female Reproductive System of Sprague-Dawley, Wistar, and Lewis Rats

The Brazilian federal government Agency for Health Surveillance detected pesticide residues in fresh food available for consumers all over the country. The current study investigated the effects of a mixture of some of those pesticides (dichlorvos, dicofol, dieldrin, endosulfan, and permethrin) on the reproductive system of Sprague-Dawley (SD), Wistar (WT), and Lewis (LEW) rats. Female rats from each strain were randomized into three experimental groups and were fed a control diet or diets added with pesticides mixture at their respective no-observed-effect level (NOEL)/no-observed-adverse-effect level (NOAEL) (low dose) (mg/kg/d): dichlorvos (0.23), dicofol (0.5), dieldrin (0.025), endosulfan (0.7), permethrin (5), or lowest-observed-effect level (LOEL)/lowest-effect level (LEL)/ lowest-observed-adverse-effect level (LOAEL) (toxically effective dose) (mg/kg/d): dichlorvos (2.3), dicofol (2.1), dieldrin (0.05), endosulfan (3.8), and permethrin (25) as reported in the literature. Euthanasia was performed between wk 10 and 12, during the estrous stage. Decreased body weights gain (SD and WT) and increased liver weights (SD, WT, and LEW) were observed in each strain fed the pesticides mixture at the higher levels. At that dose level, rat strains also varied in their responses regarding the estrous cycle, hormonal levels, and number of developing ovarian follicles. The studied mixture of pesticides was found to interfere with the female reproductive system when individual pesticides were mixed above a certain level, indicating a threshold exists for each of the strains studied.

Synthesis of Quinoline Derivatives by Multicomponent Reaction Using Niobium Pentachloride as Lewis Acid

Funda����o de Amparo �� Pesquisa do Estado de S��o Paulo (FAPESP)

Retrieval of Trichostrongylus colubriformis infective larvae from grass contaminated in winter and in spring

The survival of infective larvae (L3) of Trichostrongylus colubriformis was evaluated on Brachiaria, Coast-cross and Aruana forage grasses. Feces of sheep parasitized exclusively by T. colubriformis were deposited in winter and spring on experimental plots whose grasses were cut at two heights: 5 cm and 30 cm. One, two, four, eight, 12 and 16 weeks after depositing the feces, fecal and forage samples were collected for the retrieval and quantification of L3. Retrieval of L3 from feces and forage was negligible in winter due to the dry weather, although a few larvae were retrieved in the last larval collections. However, L3 retrieval from fecal samples was greater in spring, especially two weeks after feces were deposited on 30 cm high grasses. At this time, the L3 retrieval rate from the three forage grasses differed significantly (P < 0.05), with Aruana grass showing the highest average L3 retrieval rate, followed by Coast-cross and Brachiaria. In conclusion, the winter drought proved very unfavorable for the presence of L3 in the environment, and the microclimate of Aruana pastureland was generally the most favorable for the retrieval of infective larvae.

Wave reflection at the end of a waveguide supported by a nonlinear spring

Funda����o de Amparo �� Pesquisa do Estado de S��o Paulo (FAPESP)

Cooperative effects of H+ and H- hydrido carbonyl ruthenium derivatives; role of homogeneous and heterogeneous protonic and lewis acids in catalytic hydrocarbonylation reactions

The role played by H+ hydrido iodocarbonyl and H- hydrido carbonyl ruthenium catalysts in the different catalytic steps of hydroformylation and hydroesterification of olefins, and in the homologation of alcohols has been investigated. The H- hydrido carbonyl species are mainly involved in the activation of olefins and in the hydrogenation of the acyl intermediates to aldehydes and alcohols, whereas the H+ hydrido iodocarbonyl derivatives are involved in the activation of alcohols and other oxygenated substrates, and in their carbonylation to esters. The cooperation between the two species, possible under particular reaction conditions, results in an improvement of the selectivity towards homologation (carbonylation plus hydrogenation) products. Heterogeneous Lewis acid promoters, easily recyclable from the reaction mixture, have also been successfully used in the hydrocarbonylation of alcohols, resulting in an increase of the carbonylation and homologation products. A reaction pathway in agreement with the experimental results is discussed. �� 1989.

Estudos sobre o uso de NbCl5 como ��cido de Lewis em rea����es de Povarov

Funda����o de Amparo �� Pesquisa do Estado de S��o Paulo (FAPESP)

Aplica����o de s��lica mesoporosa modificada com mol��culas contendo bases de Lewis na pr��-concentra����o de Cd(II) em amostras aquosas

Em raz��o ao uso intensivo e por ser altamente n��o-degrad��vel, o metal Cd (II) tem causado uma grande preocupa����o na sociedade moderna devido a sua capacidade de acumular-se em matrizes ambientais manifestando toxicidade. O projeto teve como objetivo o desenvolvimento da s��ntese da S��lica Mesoporosa para o ancoramento do ligante ��cido Rube��nico sobre a superf��cie do material. A caracteriza����o do mesmo, por espectroscopia na regi��o do infravermelho (FTIR), ap��s a etapa de funcionaliza����o indicou a presen��a de grupamento amina, com banda em 3350 cm-1, bandas na regi��o de 2940 e 2850 cm-1 atribu��das a grupos metileno e a atenua����o da banda C-Cl (700 cm-1), devido ao ancoramento da mol��cula do ligante. O material foi aplicado em experimentos de batelada e o efeito de tempo de contato e do pH sobre a adsor����o de ��ons Cd (II) foi avaliado. O material apresentou cin��tica r��pida, a qual foi alcan��ada em 1 minuto e a maior adsor����o foi atingida em pH 6 (pr��ximo ao ponto de carga zero) para ambos os metais. As condi����es ��timas obtidas foram aplicadas para a determina����o da capacidade m��xima de adsor����o. Os dados obtidos da isoterma de adsor����o foram aplicados �� Equa����o Linearizada de Langmuir, fornecendo 0,03 mmol g-1, com o coeficiente de determina����o dos dados sendo R�� de 0,9961. Na segunda etapa, o material modificado foi aplicado em sistema de fluxo cont��nuo, ajustando as melhores condi����es como massa de amostra, tipos de eluente bem como o volume de eluato. Os resultados das concentra����es do metal foram obtidos por determina����o direta por espectrometria de absor����o at��mica

Caracteriza����o biom��trica e supera����o de dorm��ncia em sementes de Chloroleucon foliolosum (Benth.) G. P. Lewis

The objectives of this work were performing the biometric characterization of seed Chloroleucon foliosolum (Benth) G. P. (Lewis) from the municipality Itua��u - BA, and analyze methods of scarification and temperature on germination. The seeds were characterized according to measurements of length, width and thickness, weight of thousand seeds, and water content. Were employed methods of scarification with sandpaper and sulfuric acid for 15 and 30 minutes, and not scarified seeds, combined with germination temperatures of 20, 25, 30 and 35 ��C. Percentage and germination speed index, and percentage of primary root protrusion, abnormal seedlings, hard seeds and dead seeds were evaluated. The means of length, width and thickness was 6.03, 4.30 and 3.47 mm, respectively. The weight of a thousand seeds was 67.3 g with water content of 6.1%. Whereas the percentage germination with normal seedling, the method of scarification with sulfuric acid for 15 or 30 minutes combined to germination temperatures of 25 or 30 ��C were effective in overcoming dormancy of Chloroleucon foliolosum.

Spring 2015

In this issue: Beach House Raffle Planned "The End of the Affair" -- Dean Herring Note From the Chair: "Reflections on Reading"-- Dr. Jane J. White Membership Form

Book Review of <i> Venereal Disease and the Lewis and Clark Expedition</i> by Thomas P. Lowry

Although Lewis and Clark literature has proliferated in the last decade, few works have added scholarly discourse to this field of study. The highly focused Venereal Disease and the Lewis and Clark Expedition, however, will likely stand out on the Lewis and Clark bookshelf as an important contribution.

Panhandle Spring Conference

I am so pleased to be here with you today. live been asked to visit with you a bit about the future of IANR and its role in rural Nebraska, and that is exactly what I want to do - to visit with you. I want to hear what you have to say. I will begin today with some prepared remarks, to help you better understand how I view the work we do, but because I only have been in Nebraska since just before the Christmas holidays, and at IANR since January 2, I think it would be presumptuous of me to speak to you today as an expert on the needs of Nebraska and the role of IANR in meeting those needs.

Observations on a Cyclic Decline of Lemmings (<i>Lemmus</i>) on the Arctic Coast of Alaska during the Spring of 1949

The importance to the biotic community of various species of lemmings in arctic and subarctic regions has long been recognized, but there is little known about the ecology of these mammals. of the two species that occur on the Arctic Slope of Alaska, namely, the collared lemming, Dicrostonyx groenlandicus rubricatus (Richardson), and the brown lemming, Lemmus trimucronatus alascensis Merriam, during the spring of 1949 the writer had the good fortune to observe a cyclic decline in the population of the brown lemming on the Arctic Coast of Alaska. Observations were made during the peak density preceding this decline and were continued for more than a year subsequent to it. It is the purpose of this paper to present the results of these studies.