Threshold behavior in metastable dissociation of multi-photon ionized thymine and uracil

Microsecond-timescale HNCO loss has been observed from single-color multi-photon ionized pyrimidine nucleobases in the gas phase. Photon energy thresholds for the metastable channels have been measured at 5.55 ± 0.02 eV for thymine and 5.57 ± 0.02 eV for uracil. We argue that these results can be attributed to accessing the molecules’ S1 states with additional vibrational energy matching the threshold energy for HNCO loss from the radical cation. Combined with previous photoionization energies, this enables the S1 adiabatic energies to be deduced: 3.67 ± 0.07 eV for thymine and 3.77 ± 0.07 eV for uracil. These values are consistent with recent calculations

Patterns of variation in the biochemical composition of Mesopodopsis slabberi (Van Beneden, 1861) (Crustacea: Mysidacea)

In order to assess the patterns of variation in the biochemical composition of Mesopodopsis slabberi (Van Beneden, 1861) in a temperate estuary, we determined the protein, carbohydrate, chitin and lipid contents of freshly caught immature individuals (juveniles), adult males, and adult females during two annual cycles. Statistical analysis (anova) revealed significant differences in the biochemical components between months and development stages for the months analysed. All of the biochemical components showed significant differences between months. Environmental and trophic conditions were the main processes determining seasonal patterns of variation in biochemical composition. The results of complementary experiments carried out to estimate the effects of starvation on biochemical composition showed that the process of starvation consumed mostly carbohydrates, and also that these compounds, together with lipids, were the most affected during the refeeding period. Our findings also indicate that all body reserves were almost fully replenished during refeeding, except for carbohydrates and lipids in adult females and immature individuals (juveniles) and protein content in immature individuals (juveniles). These results indicate that responses to fasting in M. slabberi may be dependent on individual development stages, an observation that is corroborated by the significant differences in the biochemical components observed between development stages for the months analysed. Reproduction was also found to influence patterns of variation in biochemical composition.Para evaluar los modelos de variación de la composición bioquímica de Mesopodopsis slabberi (Van Beneden, 1861) en un estuario templado, determinamos los contenidos en proteínas, hidratos de carbono, quitina y lípidos de individuos inmaduros (juveniles) recién cogidos, y de machos y hembras adultos, durante dos ciclos anuales. Los análisis estadísticos (anova) revelaron, para los meses analizados, diferencias significativas en las composiciones bioquímicas entre los meses y los estados de desarrollo. Todos los componentes bioquímicos mostraron diferencias significativas entre meses. Los factores ambientales y tróficos fueron los principales procesos que determinaron los modelos estacionales de variación en la composición bioquímica. Los resultados de los experimentos complementarios, realizados para determinar los efectos de la inanición sobre la composición bioquímica, pusieron de manifiesto que los procesos de inanición consumen, fundamentalmente, hidratos de carbono, y, también, que estos compuestos, junto con los lípidos, son los más afectados durante el periodo de vuelta a la alimentación. Nuestros descubrimientos indicaron también que todas las reservas corporales son casi completamente repuestas durante la vuelta a la alimentación, excepto los hidratos de carbono y los lípidos en las hembras adultas y en los inmaduros (juveniles), y el contenido en proteínas en los juveniles. Estos resultados indican que las respuestas al ayuno de M. slabberi podrían depender del estado de desarrollo individual, observación que es corroborada por las diferencias significativas observadas, en los componentes bioquímicos y para los meses analizados, entre los distintos estados de desarrollo. Se encontró también que la reproducción tenía influencia sobre los modelos de variación de la composición bioquímica.Instituto Español de Oceanografí

Preparación, caracterización y estudios texturales de carbones activados obtenidos a partir de yerba mate y su utilización para la remoción de fenol y Cr (III) en solución acuosa

Se sintetizaron carbones activados partiendo de yerba mate con distintos tratamientos químicos y físicos y se los estudió para la remoción de fenol y Cr(III) en soluciones acuosas. Se realizó la caracterización textural de los materiales carbonosos y se calculó área específica BET; volumen, tamaño y distribución tamaños de poros y posibles heterogeneidades de la superficie, empleandoteoría de funcionales de densidad (NL/QSDFT); tipoy cantidad de grupos oxigenados superficiales por el método de Boehm; punto de carga cero; microscopía electrónica de barrido y espectroscopia infrarroja por transformada de Fourier en celda de reflectancia difusa. Los datos experimentales de la adsorción de fenoly Cr(III) en solución acuosa fueron interpretados empleando modelo de Sips. El mayor área superficial corresponde a la muestra CYMFQ con 454 m2.g-1. CYMF resultó ser la más adecuada para la remoción de fenol, con capacidad máxima de 0.0040 mol.g-1. CYMFQ resultó ser la más adecuada para la remoción de cromo con capacidad máxima de 9.66 mg.g-1

Differential Geometry applied to Acoustics : Non Linear Propagation in Reissner Beams

Although acoustics is one of the disciplines of mechanics, its "geometrization" is still limited to a few areas. As shown in the work on nonlinear propagation in Reissner beams, it seems that an interpretation of the theories of acoustics through the concepts of differential geometry can help to address the non-linear phenomena in their intrinsic qualities. This results in a field of research aimed at establishing and solving dynamic models purged of any artificial nonlinearity by taking advantage of symmetry properties underlying the use of Lie groups. The geometric constructions needed for reduction are presented in the context of the "covariant" approach.Comment: Submitted to GSI2013 - Geometric Science of Informatio

First record of anelosimus jucundus (O. Pickard-Cambridge, 1896) (araneae, theridiidae) in the state of Ceara, Brazil

We present the first record for Anelosimus jucundus O. Pickard-Cambridge, 1896 for the state of Ceará, Brazil. We collected 22 individuals in three different ecosystems: (1) Mangrove swamps, (2) Caatinga-type desert vegetation, and (3) Montane semi-deciduous tropical forest. We corrected the misinformation of Levi’s 1963 Ceará record, was actually from the state of Pernambuco. Anelosimus jucundus presents a wide altitudinal distribution, which indicates that this species can tolerate a variety climatic conditions and can colonize a variety of sites with different vegetation155933936CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPnão temnão temnão temThis study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES), Finance Code 001 (G.A. Villanueva-Bonilla). We were also financially supported by the Instituto Na-cional de Ciência e Tecnologia dos Hymenoptera Para-sitoides (HYMPAR/Sudeste – CNPq/FAPESP/CAPES), FUNCAP-BPI proc. BP3- 00139- 00186.01.00/18 (research grants to J.F. Sobczak

Técnicas Agrícolas, Preservação E Impactos Ambientais Na Região Oeste Do Paraná

The aim of this paper is to analyze the implications of technological change of Paraná agriculture and environmental impacts of these structural changes, choosing the backdrop of the western Paraná. The technological agricultural model introduced in Brazilian agriculture since the 1950, and (later 1970) in Paraná agricultural framework, has as one of its central features the exclusion of small producers, stimulating the production of high commercial price crops (commodities), which, by their nature, require extensive planting areas at the expense of food produced by most producers. It is noteworthy that the pressure of the industrial sector on the agricultural sector, strengthened after the process of industrialization and internationalization of capital, is significant. The methodology involved a literature review, listing the economic cycles that marked the occupation of the State of Paraná and the exploitation of natural resources, as well as the maintenance of environmental preservation areas, specifically the Iguaçu National Park, established in 1939 as a reserve Full Protection. The results allowed us to consider the character of dispersion of technological change in the state of Paraná agriculture, understanding that not all of its regions make technical and mechanized the same time.3630232

The η\eta-3N problem with separable interactions

The $\eta$-3N-interaction is studied within the four-body Faddeev-Yakubovsky theory adopting purely separable forms for the two- and three-body subamplitudes, limiting the basic two-body interactions to s-waves only. The corresponding separable approximation for the integral kernels is obtained by using the Hilbert-Schmidt procedure. Results are presented for the $\eta$-$^3$H scattering amplitude and for the total elastic cross section for energies below the triton break-up threshold.Comment: revised version accepted for Phys. Rev. C, 16 pages revtex including 6 eps-figures, formal part shortene

Integration of all FSSIM components within SEAMLESS-IF and a stand alone Graphical User Interface for FSSIM

Agricultural and Food Policy, Environmental Economics and Policy, Farm Management, Land Economics/Use,