CIRCADIAN OSCILLATORY PATTERNS OF OXYGEN-UPTAKE IN INDIVIDUAL WORKERS OF THE ANT CAMPONOTUS-RUFIPES

Respiratory rates of individual workers of Camponotus rufipes Fabricius (Hymenoptera: Formicidae) were measured at 25-degrees-C and LD 12:12 h (lights on 06.00 hours), DL 12:12 h (lights on 18.00 hours), LL (850 lux) and DD (red light, 20-30 lux), using the micro-Warburg technique. Worker ants were collected from natural nest during the winter of 1987 in a woodland park in the region of Rio Claro, São Paulo, Brazil. The respiration of ants showed a circadian rhythm with acrophase ranging from 20 h 41 min to 01 h 18 min and from 10 h 32 min to 12 h 22 min at LD and DD, respectively. In constant darkness the rhythmometric variables were similar to those presented by ants kept at LD 12:12 h. Under constant light no circadian rhythm in the respiration rates was found. A reduction in the amplitude was observed, indicating an inhibitory effect of this light regime on the respiration process.

A natural triploid in Trichomycterus davisi (Siluriformes, Trichomycteridae): mitotic and meiotic characterization by chromosome banding and synaptonemal complex analyses

Within a total of 50 analyzed specimens a male individual of Trichomycterus davisi has been recorded with 81 chromosomes including 60 metacentric, 18 submetacentric and three subtelocentric chromosomes. When compared with diploid individuals (2n = 54) and the morphological standard of chromosomes, this male is a triploid with 3 = 81 chromosomes. Since staining with silver nitrate indicates three active nucleolar organizer regions (NORs), the three NOR- bearing chromosomes in this individual are genetically active. Analysis of the synaptonemal complex (SC) by electronic microscopy shows that there is an incomplete pairing of the third set of chromosomes in the triploid individual.

A possible stellar metallic enhancement in post-T Tauri stars by a planetesimal bombardment

The photospheres of stars hosting planets have larger metallicity than stars lacking planets. This could be the result of a metallic star contamination produced by the bombarding of hydrogen-deficient solid bodies. In the present work we study the possibility of an earlier metal enrichment of the photospheres by means of impacting planetesimals during the first 20-30 Myr. Here we explore this contamination process by simulating the interactions of an inward migrating planet with a disc of planetesimal interior to its orbit. The results show the percentage of planetesimals that fall on the star. We identified the dependence of the planet's eccentricity (e(p)) and time-scale of migration (tau) on the rate of infalling planetesimals. For very fast migrations (tau= 10(2) and 10(3) yr) there is no capture in mean motion resonances, independently of the value of e(p). Then, due to the planet's migration the planetesimals suffer close approaches with the planet and more than 80 per cent of them are ejected from the system. For slow migrations (tau= 10(5)and 10(6) yr) the percentage of collisions with the planet decreases with the increase of the planet's eccentricity. For e(p) = 0 and 0.1 most of the planetesimals were captured in the 2:1 resonance and more than 65 per cent of them collided with the star. Whereas migration of a Jupiter mass planet to very short pericentric distances requires unrealistic high disc masses, these requirements are much smaller for smaller migrating planets. Our simulations for a slowly migrating 0.1 M-Jupiter planet, even demanding a possible primitive disc three times more massive than a primitive solar nebula, produces maximum [Fe/H] enrichments of the order of 0.18 dex. These calculations open possibilities to explain hot Jupiter exoplanet metallicities.

Determination of cocaine in samples of hair using the chromatographic column, ISRP-C-18

A method has been developed for the determination of the cocaine levels in samples of hair, using a chromatographic column internal surface reverse phase (ISRP)-C-18, for direct injection of the extracts of hair, without purification or derivation of the sample. The method allows monitoring an individual stopped for using or making cocaine. This method allowed the determination of levels of cocaine concentration in 75% of the analyzed samples of chemical dependents' hair, with cocaine detected at levels of 0.37-16.85 mug g(-1). In the other analyzed samples (25%), the drug was not detected, because the corresponding individuals told us that they consumed cocaine infrequently and in small amounts. The detection

Heritability estimates and genetic correlations for body weight and scrotal circumference adjusted to 12 and 18 months of age for male Nellore cattle

Heritability estimates and genetic correlations were obtained for body weight and scrotal circumference, adjusted, respectively, to 12 (BW12 and SC12) and 18 (BW18 and SC18) months of age, for 10 742 male Nellore cattle. The adjustments to SC12 and SC18 were made using a nonlinear logistic function, while BW12 and BW18 were obtained by linear adjustment. The contemporary groups (CGs) were defined from animals born on the same farm, in the same year and birth season. The mean heritability estimates obtained using the restricted maximum likelihood method in bi-trait analysis were 0.25, 0.25, 0.29 and 0.42 for BW12 BW18, SC12 and SC18, respectively. The genetic correlations were 0.30 +/- 0.11, 0.21 +/- 0.13, 0.21 +/- 0.11, -0.08 +/- 0.15, 0.16 +/- 0.12 and 0.89 +/- 0.04 between the traits BW12 and BW18; BW12 and SC12; BW12 and SC18; BW18 and SC12; BW18 and SC18; and SC12 and SC18. The heritability for SC18 was considerably greater than for SC12 suggesting that this should be included as a selection criterion. The genetic correlation between BW18 and SC12 was close to zero, indicating that these traits did not influence each other The contrary occurred between SC12 and SC18, indicating that selection using one of these could alter the other Because of the mean magnitudes of heritabilities in the various measurements of weight and scrotal perimeter it is suggested that the practice of individual selection for these traits is possible.

Stars of WIMPs

A class of boson-fermion stars, whose spin-0 and spin-1/2 constituents interact through a U(1) current-current term in the Lagrangian density, is analyzed. It is shown that it describes the low-energy behavior of a system of weakly interacting massive particles (WIMPs) from the leptonic sector of the minimal supersymmetric standard model. In this case the effective coupling constant A is related to the Fermi constant GF.

Collective scattering of massive stars in higher order gravity

In the weak field approximation of higher order gravity theory a gravitational potential is described by a Newtonian plus a Yukawa-like term. This new term is used to explain some aspects of galactic dynamics, without considering dark matter. Its presence modifies the scattering probability of a massive intruder star and relaxation time of the stellar system.

Análisis económico de los costos externos ambientales de la generación de energía eléctrica

Incluye Bibliografía

Crisis de gobernabilidad en la gestión del agua: desafíos que enfrenta la implementación de las recomendaciones contenidas en el capítulo 18 del Programa 21

Incluye Bibliografía

Rasgos generales de los sistemas previsionales de capitalización individual y de sus contextos laborales y demográficos

Incluye Bibliografía

O papel da ginástica terapêutica chinesa Lian Gong em 18 terapias no comportamento psicomotor e cotidiano de praticantes adultos

Pós-graduação em Ciências da Motricidade - IBRC

Aids e uso de preservativos por adolescentes: análise da história individual e práticas culturais

Pós-graduação em Psicologia do Desenvolvimento e Aprendizagem - FC

Atenção à saúde e modos de andar a vida: a produção de conhecimentos em psicologia e os subsídios para um cuidado que pretenda produzir saúde para crianças e famílias nos contextos de pobreza

Um cuidado em saúde que vise a integralidade em suas ações e propostas deve levar em consideração os contextos singulares de vida da população e de cada pessoa em particular, se observadas as considerações da bibliografia especializada. Sabe-se que o Brasil é um país que apresenta um grave quadro de desigualdade social e o conhecimento da diversidade cultural existente entre os grupos sociais que co-existem em nosso país é fundamental para a realização de um cuidado em saúde integral com a população. O objetivo deste estudo foi compreender se e de que forma os elementos considerados importantes para a produção de saúde no contexto de vulnerabilidade social no Brasil estão sendo levados em conta na produção acadêmica da área da psicologia. Para isso, foram analisados textos presentes na Biblioteca Virtual em Saúde, a partir da relação psicologia e SUS, totalizando 37 estudos. A importância de uma prática contextualizada foi evidenciada, porém não houve em nenhum dos textos a descrição das especificidades dos contextos familiares em situação de pobreza, sinalizando que este conhecimento não está disponível na área e que saberes de áreas distintas da saúde são fundamentais para um cuidado integral em saúde. A integralidade, o trabalho em equipe e a prevenção e promoção à saúde são elementos significativos nas produções, porém podemos perceber que estas diretrizes encontram-se ainda no plano da reflexão e verbalização, de um modo geral não traduzindo-se em práticas profissionais. Os desafios que distanciam a prática dos profissionais da psicologia e as diretrizes do SUS resumem-se em uma formação voltada para o atendimento clínico individual e a consequente prática descontextualizada, voltada para a psicoterapia. Outros desafios assinalados foram formas de organização do próprio SUS e a desconsideração deste profissional como generalista nas políticas de saúde. O conceito de resiliência de um modo geral não está presente nos estudos, mas a presença de elementos importantes para promover a autonomia dos indivíduos demonstra que formas de fortalecer os indivíduos foram considerados importantes. Foram analisadas também as estratégias de educação: formação acadêmica e Educação Permanente em Saúde (EPS). Observou-se que a discussão sobre a formação está presente na maioria dos textos e que mudanças tímidas já foram constatadas buscando aproximar a área da realidade do SUS. A EPS não é um fator significativo nos estudos, e seu potencial ainda não foi explorado no que concerne a psicologia.

Comportamento ingestivo de bovinos em sistema de pastejo rotacionado submetidos a diferentes estratégias de suplementação

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

A classificação bibliográfica no contexto do tratamento temático da informação: um estudo com o protocolo verbal individual em bibliotecas do Instituto Federal de Educação, Ciência e Tecnologia (IF´s)

The discussions that underpin the process of bibliographic classification in documentaries systems should be designed with scientific basis and theoretical, rather than only be based on professional practice. The theoretical approaches, however, attention should also be involved in professional practice. From this, the present study seeks to demonstrate through the perception of catalogers professional, the importance of reflections on the activity of Thematic Treatment of Information, especially the bibliographic classification in order to engender the strengthening of the area and improvements in product quality and services resulting from libraries. In this context, was carried out a study in the libraries of two Federal Institutes of Education, Science and Technology (IF’s) located in two different states of southeastern Brazil. Technique was employed introspective data collection Verbal Protocol in Individual mode, having qualitative character.