Efeitos de doses e formas de aplicação de reguladores de crescimento em uvas sem sementes, cv. BRS Clara, em região tropical.

O objetivo deste trabalho foi avaliar o efeito do uso dos reguladores vegetais, ácido giberélico e tidiazuron, no tamanho de bagas da cultivar BRS Clara em Região Tropical. Os experimentos foram conduzidos em 2006 e 2007, na Estação Experimental de Viticultura Tropical, em Jales-SP, região noroeste do Estado de São Paulo, em plantas da cv. BRS Clara. Foram testadas diferentes concentrações de GA3 aplicadas isoladamente, combinadas com Crop Set ou tidiazuron, em aplicações únicas ou sequênciais (2 e 4 vezes). As avaliações foram feitas por ocasião da maturação das uvas, considerando-se a massa fresca dos cachos, dos engaços e das bagas, determinadas por meio de balança analítica; o comprimento e o diâmetro médio das bagas, utilizando-se de paquímetro; e o teor de sólidos solúveis (SS), por meio de refratômetro manual. Os experimentos foram conduzidos em delineamento experimental de blocos casualizados, representados por uma planta, com 15 repetições, no ano de 2006, e 10 repetições, no ano de 2007. Os dados foram submetidos à análise de variância e, para a comparação das médias dos tratamentos, foi utilizado o teste Skott Nott, ao nível de 5% de probabilidade. Observou-se que o uso dos reguladores promoveu o crescimento das bagas na cultivar BRS Clara em todos os tratamentos, diferindo da testemunh

Self‐assembled quantum dots of InSb grown on InP by atomic layer molecular beam epitaxy: Morphology and strain relaxation

Self-organized InSb dots grown by atomic layer molecular beam epitaxy on InP substrates have been characterized by atomic force and transmission electron microscopy. Measurement of high-energy electron diffraction during the growth indicates a Stransky–Krastanov growth mode beyond the onset of 1.4 InSb monolayer ~ML! deposition. The dots obtained after a total deposition of 5 and 7 ML of InSb present a truncated pyramidal morphology with rectangular base oriented along the ^110& directions, elongated towards the @110# direction with $111$113%/$114$111%A lateral facets in @11 ¯ 0# views, and ~001! flat top surfaces. The mismatch between the dot and the substrate has been accommodated by a network of 90° misfit dislocation at the interface. A corrugation of the InP substrate surrounding the dot has been also observedThis work has been funded by the Spanish CICYT Project MAT95-0966.Peer reviewe

Gigantism: microsurgical treatment by transsphenoidal approach and prognostic factors

Purpose: We present the results of transsphenoidal microsurgical treatment in 14 patients with gigantism. The influence on the prognosis of factors such as the tumor size and preoperative levels of GH and IGF-1 is also quantified. Materials and methods: The patients, operated between 1982 and 2004, were reviewed retrospectively in June 2022. All patients had complete endocrinological studies in the preoperative period and a postoperative control between 6 days and 3 weeks. Follow-up has been supported with annual check-ups between 3 and 31 years. We have compared the preoperative levels of GH and IGF-1 of these patients with the levels of a series of acromegalic patients operated on in the same Center. Results: In this series there were 4 women and 10 men. The age ranged between 14 and 21 years. In 6 patients, postoperative hormone levels achieved the disease control criteria (42.8%). The CT/MRI studies revealed the existence of invasive tumors in 10 of the patients (71.4%). Postoperative CT/MRI showed no tumor tissue in 3 patients but in 7 patients there were tumor remains. The remaining 4 patients had abnormal images although not considered as tumor. A statistical comparison of preoperative serum GH and IGF-1 levels in patients with gigantism and patients with acromegaly showed a significant elevation in the former. Conclusion: Pituitary adenomas that cause gigantism are generally large and invasive, which makes them difficult to cure. High preoperative levels of GH and IGF-1 are also factors that decrease remission

Effects of solar irradiation on thermally driven CO2 methanation using Ni/CeO2-based catalyst

Utilization of the renewable energy sources is one of the main challenges in the state-of-the-art technologies for CO2 recycling. Here we have taken advantage of the solar light harvesting in the thermocatalytic approach to carbon dioxide methanation. The large-surface-area Ni/CeO2 catalyst produced by a scalable low-cost method was characterized and tested in the dark and under solar light irradiation conditions. Light-assisted CO2 con-version experiments as well as in-situ DRIFT spectrometry, performed at different illumination intensities, have revealed a dual effect of the incident photons on the catalytic properties of the two-component Ni/CeO2 catalyst. On the one hand, absorbed photons induce a localized surface plasmon resonance in the Ni nanoparticles fol-lowed by dissipation of the heat to the oxide matrix. On the other hand, the illumination activates the photo-catalytic properties of the CeO2 support, which leads to an increase in the concentration of the intermediates being precursor for methane production. Analysis of the methane production at different temperatures and illumination conditions has shown that the methanation reaction in our case is controlled by a photothermally- activated process. The used approach has allowed us to increase the reaction rate up to 2.4 times and conse-quently to decrease the power consumption by 20 % under solar illumination, thus replacing the conventional thermal activation of the reaction with a green energy source

Organización espontánea de puntos cuánticos de InSb crecidos por ALMBE sobre substratos de InP

El crecimiento autoorganizado de puntos cuánticos de InSb sobre substratos de InP mediante epitaxia de haces moleculares ha sido caracterizado mediante microscopía electrónica de transmisión y microscopía de fuerzas atómicas a fin de estudiar la morfología y establecer el mecanismo de relajación de las estructuras. Medidas de difracción de electrones de alta energía durante el crecimiento de las muestras indican una transición en el modo de crecimiento de bidimensional a tridimensional a partir de un espesor total equivalente depositado de 1.1 monocapas atómicas de InSb. Los puntos cuánticos tienen en general, una buena calidad cristalina así como una distribución superficial homogénea, pero una alta anisotropía en las dimensiones entre las direcciones [110] y [110]. Así mismo, se encuentra una rugosidad superficial, también afectada de un alto grado de anisotropía, siendo las crestas y los valles paralelos a la dirección de elongación de las islas. Las imágenes de microscopía electrónica revelan un facetado de las estructuras según planos (001) que las limitan por la parte superior y planos {111}, {113} y {114}, que las limitan lateralmente. Las tensiones son eficazmente relajadas por la presencia de una red de dislocaciones situada en la interficie InSb/InP

Microstructure and secondary phases in coevaporated CuInS2 films: Dependence on growth temperature and chemical composition

The microstructure of CuInS2-(CIS2) polycrystalline films deposited onto Mo-coated glass has been analyzed by Raman scattering, Auger electron spectroscopy (AES), transmission electron microscopy, and x-ray diffraction techniques. Samples were obtained by a coevaporation procedure that allows different Cu-to-In composition ratios (from Cu-rich to Cu-poor films). Films were grown at different temperatures between 370 and 520-°C. The combination of micro-Raman and AES techniques onto Ar+-sputtered samples has allowed us to identify the main secondary phases from Cu-poor films such as CuIn5S8 (at the central region of the layer) and MoS2 (at the CIS2/Mo interface). For Cu-rich films, secondary phases are CuS at the surface of as-grown layers and MoS2 at the CIS2/Mo interface. The lower intensity of the MoS2 modes from the Raman spectra measured at these samples suggests excess Cu to inhibit MoS2 interface formation. Decreasing the temperature of deposition to 420-°C leads to an inhibition in observing these secondary phases. This inhibition is also accompanied by a significant broadening and blueshift of the main A1 Raman mode from CIS2, as well as by an increase in the contribution of an additional mode at about 305 cm-1. The experimental data suggest that these effects are related to a decrease in structural quality of the CIS2 films obtained under low-temperature deposition conditions, which are likely connected to the inhibition in the measured spectra of secondary-phase vibrational modes

Age-Related Degradation of Nuclear Power Plant Structures and Components

This paper summarizes and highlights the results of the initial phase of a research project on the assessment of aged and degraded structures and components important to the safe operation of nuclear power plants (NPPs). A review of age-related degradation of structures and passive components at NPPs was performed. Instances of age-related degradation have been collected and reviewed. Data were collected from plant generated documents such as Licensing Event Reports, NRC generic communications, NUREGs and industry reports. Applicable cases of degradation occurrences were reviewed and then entered into a computerized database. The results obtained from the review of degradation occurrences are summarized and discussed. Various trending analyses were performed to identify which structures and components are most affected, whether degradation occurrences are worsening, and what was the most common aging mechanisms. The paper also discusses potential aging issues and degradation-susceptible structures and passive components which would have the greatest impact on plant risk

Efeitos de reguladores de crescimento em uvas sem sementes, cv. BRS Clara, em Região Tropical.

A BRS Clara é uma cultivar de uva sem sementes, lançada em 2003 pela Embrapa Uva e Vinho, que apresenta, naturalmente, bagas com cerca de 15mm de diâmetro e 20mm de comprimento (CAMARGO et al., 2003). Sendo assim, a aplicação exógena de reguladores de crescimento para aumento do tamanho de bagas pode contribuir para a melhoria da qualidade do cacho e facilitar a comercialização de cultivares de uvas sem sementes (NACHTIGAL et al., 2005)