Spectrophotometric determination of arsenic in soil samples using 2-(5-bromo-2-pyridylazo)-5-di-ethylaminophenol (Br-PADAP)

Um novo método, simples e sensível para a determinação de arsênio em solo é proposto neste trabalho. Este método é baseado na redução de prata (I) e ferro (III) pela arsina seguida da reação de complexação do ferro (II) com o reagente espectrofotométrico 2-(5-bromo-2-piridilazo)-5-di-etilaminofenol (Br-PADAP). A determinação de arsênio apresentou uma sensitividade de Sandell de 3.1x10^-4 cm^-2, foi linear na faixa de 0.1 µg ml^-1 to 2.0 µg ml^-1 (r₅₆₀ = 0.9995), apresentou uma absortividade molar de 2.45x10⁵ l mol^-1 cm^-1 e um limite de detecção de 1.4 ng ml^-1 (3s) estes dados foram obtidos para 10 ml de amostra. A seletividade foi melhorada com o uso de EDTA com agente mascarante. O método proposto foi aplicado na determinação do arsênio na presença de outros íons e em amostras de solo. Os resultados revelaram que antimônio (III), mercúrio (II), germânio (IV), platina (IV) interferem na análise em todas as proporções analisadas. As interferências podem ser facilmente removidas pelo uso do EDTA. A precisão e a exatidão deram resultados satisfatórios, com desvio padrão relativo abaixo de 5%. As recuperações de arsênio em solo variaram de 95,55 a 102,70% com uma média de 99,63%. Estes resultados demonstraram que o método proposto é aplicável para a análise do arsênio em diferentes amostras de solo.

Ocorrência de isoflavonas de soja no ambiente e correlação com atividades estrogênica : estudo de caso da região de Dourados (MS)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

A homonímia no português: tratamento semântico segundo a estrutura Qualia de Pustejovsky com vistas a implementações computacionais

No presente trabalho, apresentamos uma proposta de tratamento semântico de formas ambíguas do português do Brasil, no caso, lexias homógrafas, com o escopo de oferecermos estratégias lingüísticas para a sua implementação computacional em Sistemas de Processamento das Línguas Naturais (SPLN). O Léxico Gerativo de Pustejovsky foi usado como modelo teórico. Nesse modelo, a Estrutura Qualia - EQ (e os papéis Formal, Télico, Agentivo e Constitutivo) foi selecionada como um dos expedientes lingüístico-semânticos para a realização da desambiguação das formas homônimas. Para que os dados analisados e tratados pudessem ser manipulados, elaboramos uma Base de Conhecimento Lexical (BCL) cujo repertório lingüístico possui seus itens lexicais correlacionados e interligados por diferentes tipos de relações semânticas presentes na EQ.

Estudo do efeito da composição e da nanoestrutura de nanopartículas de 'PT''NI' suportadas em carbono na eletrocatálise da reação de redução do oxigênio

Pós-graduação em Química - IQ

Catalisadores nanoestruturados contendo ligas de 'PT' e 'TI''O IND.2' para a oxidação eletroquímica de etanol

Pós-graduação em Química - IQ

A peculiar stable region around Pluto

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

The effect of follicle age on pregnancy rate in beef cows

The effect of the age of the ovulatory follicle on fertility in beef cows was investigated. Multiparous (n = 171) and primiparous (n = 129) postpartum beef cows in 2 groups (G1 and G2) received estradiol benzoate (EB; 1 mg/500 kg BW, intramuscular [i.m.]) 5.5 d (G1; n = 162) and 6.5 d (G2; n = 138) after the final GnRH of a synchronization program (5d CO-Synch + CIDR) to induce emergence of a new follicular wave (NFW), followed by prostaglandin F2 alpha (PGF2 alpha; 25 mg, i.m.) administration either 5.5 d (young follicle, YF; n = 155) or 9.5 d (mature follicle, MF; n = 145) after EB. Estrous detection coupled with AI 12 h later (estrus-AI) was performed for 60 h (MF) and 84 h (YF) after PGF(2 alpha); cows not detected in estrus within this period received timed AI (TAI) coupled with GnRH at 72 and 96 h, respectively. Within the first 72 h after PGF(2 alpha), more (P < 0.01) cows in the MF (76.3%) than YF treatment (47.7%) exhibited estrus, but through 96 h, the proportion detected in estrus (P < 0.05) and interval from PGF(2 alpha) to estrus (P < 0.01) were greater in the YF than MF treatment (88.6% vs. 76.3%, 78.9 +/- 0.8 vs. 57.5 +/- 1.6 h, respectively). Age of the ovulatory follicle at AI was greater (P < 0.01) in the MF (9.32 +/- 0.04 d) than YF (6.26 +/- 0.02 d) treatment, but follicle diameter at AI and pregnancy rates did not differ between MF (13.1 +/- 0.2 mm; 72.0%) and YF (12.9 +/- 0.1 mm; 67.1%) treatments. Regardless of treatment, the diameter of the ovulatory follicle at AI and pregnancy rate were greater (P < 0.01) with estrus-AI (13.1 +/- 0.1 mm; 75.0%) than TAI (12.6 +/- 0.2 mm; 55.4%). Cows in the MF treatment that initiated a second NFW after EB but before PGF(2 alpha) (MF2; n = 47) were induced to ovulate with GnRH and TAI at 72h, when ovulatory follicles were 4 d old and 10.2 +/- 0.2 mm in diameter. Pregnancy rate for TAI (51.1%) in MF2 did not differ from TAI pregnancy rate (55.4%) across the MF and YF treatments. In summary, the age of the ovulatory follicle affected interval to estrus and AI but did not influence pregnancy rate in suckled beef cows.

Improved sperm cryosurvival in diluents containing amides versus glycerol in the Przewalski's horse (Equus ferus przewalskii)

Two studies were conducted to understand sperm cryosensitivity in an endangered equid, the Przewalski's horse (Equus ferns przewalski), while testing the cryoprotectant ability of formamides. The first assessed the toxicity of permeating cryoprotectants (glycerol, methylformamide IMF] and dimethylformamide [DMF]) to Przewalski's horse spermatozoa during liquid storage at 4 C. The second examined the comparative influence of three diluents (with or without formamides) on cryosurvival of sperm from the Przewalski's versus domestic horse. When Przewalski's horse spermatozoa were incubated at 4 C in INRA 96 with differing concentrations of glycerol, MF or DMF or a combination of these amides, cells tolerated all but the highest concentration (10% v/v) of MF alone or in combination with DMF, both of which decreased (P < 0.05) motility traits. There was no effect of cryoprotectants on sperm acrosomal integrity. In the cryosurvival study, average sperm motility and proportion of cells with intact acrosomes in fresh ejaculates were similar (P> 0.05) between the Przewalski's (67%, 84%, respectively) and domestic (66%, 76%) horse donors. Sperm from both species were diluted in lactose-EDTA-glycerol (EQ), Botu-Crio (BOTU; a proprietary product containing glycerol and MF) or SM (INRA 96 plus 2% [v/v] egg yolk and 2.5% [v/v] MF and DMF) and then frozen over liquid nitrogen vapor. After thawing, the highest values recovered for total and progressive sperm motility, acrosomal integrity and mitochondria] membrane potential were 42.4%, 21.8%, 88.7% and 25.4 CN (CN = mean JC-1 fluorescence intensity/cell on a channel number scale), respectively, in the Przewalski's and 49.3%, 24.6%, 88.9% and 25.8 CN, respectively, in the domestic horse. Although sperm progressive motility and acrosome integrity did not differ (P> 0.05) among treatments across species, mitochondrial membrane potential was higher (P< 0.05) in both species using EQ compared to BOTU or SM media. Additionally, Przewalski's stallion sperm expressed higher (P < 0.05) post-thaw total motility in BOTU and SM compared to EQ whereas there were no differences among freezing diluents in the domestic horse. In summary, Przewalski's stallion sperm benefit from exposure to either MF or DMF as an alternative cryoprotectant to glycerol. Overt sperm quality appears similar between the Przewalski's and domestic horse, although the total motility of cells from the former appears more sensitive to certain freezing diluents. Nonetheless, post-thaw motility and acrosomal integrity values for Przewalski's horse spermatozoa mimic findings in the domestic horse in the presence of INRA 96 supplemented with 2% (v/v) egg yolk and a combined 2.5% concentration of MF and DMF. Published by Elsevier Inc.

Ultrastructural Morphology and Nuclear Maturation Rates of Immature Equine Oocytes Vitrified with Different Solutions and Exposure Times

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Correlação entre condição da superfície do solo agrícola e o coeficiente de absorção acústica

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

Meninas confinadas. Perfil das jovens em cumprimento de medida de internação em São Paulo e no Pará

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

O professor na visão das crianças: uma pesquisa sobre a construção do conhecimento social sob o enfoque piagetiano

The focus of this paper is on the construction of social knowledge according to Piagetian constructivist theory. We present data related to the ideas of children aged seven and eight years old about the role of the teacher. We observed 52 children, both male and female, immersed in two different educative environments: one considered socio-moral constructivist and the other one, traditional. The main results showed the particular processes of the individuals when they try to comprehend the surrounding reality. The only meaningful difference between the two environments studied was related to the comprehension of the necessity of formation to develop the function of a teacher. In the other aspects observed we have not found meaningful differences concerning the representations of the subjects as well as the environment in which they participated.

Percepção da importância da participação de idosos em uma universidade aberta da terceira idade

Introduction: Aging is part of the natural human way. Aging is also synonymous with continuous gain experience. Aging, especially in our culture, unfortunately, can also be synonymous with exclusion, but not in relation to the UNATI Marília SP Open University of the Third Age, which has as main objective the integration through social interaction in academia, transforming experience and knowledge in quality of life in a constant learning. Objective: This article aims to report an investigation into the reasons attributed to the importance of an elderly attending the Open University of the Third Age in the vision of the elderly who attend. Material and Method: Bring a profile of the elderly by gender, age, marital status, education level, profession, financial aspects. The sample consisted of 52 elderly and the sampling method was convenience. Results: The results showed that the greater importance attached to participation was to gain more knowledge and be updated followed by meeting new people and making new friends, exercising the memory, healthy and interestingly filling free time and to improve quality of life. The participation of the elderly caused possibilities of making new friends, improvement in depression and motivation to acquire new knowledge. Conclusion: We conclude that the Open University of the Third Age can contribute to improvement of quality of life especially with regard to social interaction and cognitive aspect.

Inflação e crescimento econômico: uma análise da política de Vargas ao final do Estado Novo

This article is about the measures that were taken against the inflation in the final period of Estado Novo. Characterized by an inflationary pressure increasing in the end of World War II and the regime crisis. We stand for the idea that the measures concerning the end of the inflation were subordinate to the economic development. The struggle against inflation was mainly based on the control of the prices and measures to extend the supply. The anti-inflationary policy of Vargas’ mandate was directly conditioned by political disputes around the transition and the direction of the economy.

Humanização da saúde na formação de profissionais da fisioterapia

Introduction: the relationship between professional and patient oriented by humanization standards is a current issue in health research, since this relationship influences the processes of physical recovery, pain reduction and quality of life of individuals. However, this is not observed in most graduate programs in health, which emphasize knowledge and methods in the traditional Cartesian thinking. Objective: to evaluate the importance of contents and practices with a focus on issues of embodiment and alterity, from the perspective of the humanization of health in Physiotherapy courses. Method: we used a qualitative method and data were collected through semi-structured interviews conducted by five randomly selected physiotherapists, aged between 23 and 36 years, with professional experience between two and thirteen years. The questions were on: physical therapy, physical therapist and patient relationship, work pace, involvement in trade associations, field and insert content and practices of the humanization of health in undergraduate courses. Result: the Physiotherapy graduate courses do not prepare the professional to take a close bond with patients. The application of techniques and protocols are focused on knowledge and do not apply to skills related to living together. Conclusion: the curriculum of graduating courses in health should be revised to expand the capacity of the students to become a professional who take care of patients and act as mediator between techniques and protocols, from the perspective of humanization of health, which requires contents and procedures based on embodiment and alterity.