Carbono orgânico solúvel em água no material particulado de regiões canavieiras do Estado de São Paulo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Espécies ácidas gasosas e íons majoritários no material particulado atmosférico de uma região agriícola do Mato Grosso

Pós-graduação em Química - IQ

"Will It Rain?" Activities Investigating Aerosol Hygroscopicity and Deliquescence

Climate change and its consequences seem to be increasingly evident in our daily lives. However, is it possible for students to identify a relationship between these large-scale events and the chemistry taught in the classroom? The aim of the present work is to demonstrate that chemistry can assist in elucidating important environmental issues. Simple experiments are used to demonstrate the mechanism of cloud formation, as well as the influence of anthropogenic and natural emissions on the precipitation process. The experiments presented show the way in which particles of soluble salts commonly found in the environment can absorb water in the atmosphere and influence cloud formation.

Nanopartículas de alginato como sistema de liberação para o herbicida clomazone

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

Poly(epsilon-caprolactone)nanocapsules as carrier systems for herbicides: Physico-chemical characterization and genotoxicity evaluation

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

Controlled release system for ametryn using polymer microspheres: Preparation, characterization and release kinetics in water

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

Influence of support on catalytic behavior of nickel catalysts in the steam reforming of ethanol for hydrogen production

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Removal of metal ions from aqueous solution by chelating polymeric hydrogel

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

O discurso de alunos do ensino médio a respeito da camada de ozônio

O objetivo deste trabalho foi investigar os gêneros de discursos utilizados por alunos da terceira série do Ensino Médio a respeito de um dos conteúdos vinculados ao ensino de química ambiental: o estudo do gás ozônio e os problemas relacionados à degradação de sua camada na atmosfera terrestre. Os resultados apontam para um nível de envolvimento discursivo em que se percebe a apropriação da linguagem científica como ferramenta de argumentação acerca das questões ambientais.

Preparation of CuO/SiO2 and photocatalytic activity by degradation of methylene blue

A photocatalyst based on CuO/SiO2 was prepared, and evaluated for the degradation of methylene blue in aqueous medium. The photocatalyst was obtained by calcination method of copper salt, in the presence of silica. The characterization by XRD, FTIR, and TPR techniques confirmed the formation of CuO as active phase. SEM studies showed CuO deposited on the surface of SiO2. By ESI-MS, it was demonstrated that the degradation of methylene blue occurs through successive hydroxylations. Photodegradation assays showed that CuO/SiO2 was efficient for degradation, and that the material worked better in the presence of UV light.

Perinatal exposure to parasiticide ivermectin: Long-term effects on reproductive parameters of adult male rats

Ivermectin is one of the most widely used antiparasitic drugs globally. The aim of this study was to evaluate the chronic effects of perinatal exposure to ivermectin on male reproductive parameters in rats. Pregnant rats were treated daily by oral gavage with 0.4 or 1.6 mg kg -1 of ivermectin or vehicle, from gestational day 6 until post-natal day 10. In the adulthood stage, there were significant reductions in the relative testicular weight of rats exposed to the low dose and in relative prostate weight of male rats exposed to the high dose of ivermectin. Furthermore, the animals exposed to the low dose also presented an increased seminal vesicle weight compared to controls. However, neither of the ivermectin doses interfered in daily sperm production, sperm number in testis, or sexual behavior of exposed males. In conclusion, perinatal exposure to ivermectin neither altered the male reproductive system development markedly, nor produced any adverse effects on the parameters evaluated. © 2011 Taylor & Francis.

Biodisponibilidade de metais na baía da Ilha Grande, RJ: avaliação pelas técnicas de bivalves transplantados (Nodipecten nodosus) e difusão de filmes finos por gradiente de concentração

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Determinação da fração lábil de mercúrio em águas fluviais

Pós-graduação em Geociências e Meio Ambiente - IGCE

Remoção de 'H IND. 2' 'S' de ar por Thiobacillus denitrificans utilizando biofiltro percolador

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

O papel das substâncias húmicas na disponibilidade de metais e benzo[a]pireno e indução de metalotioneínas em peixes

Pós-graduação em Química - IBILCE