Neutron Transfer reactions induced by 8Li on 9Be

Angular distributions for the elastic scattering of 8Li on 9Be and the neutron transfer reactions 9Be(8Li,7Li)10Be and 9Be(8Li,9Li)8Be have been measured with a 27 MeV 8Li radioactive nuclear beam. Spectroscopic factors for 8Li|n=9Li and 7Li|n=8Li bound systems were obtained from the comparison between the experimental differential cross section and finite-range DWBA calculations with the code FRESCO. The spectroscopic factors obtained are compared to shell model calculations and to other experimental values from (d,p) reactions. Using the present values for the spectroscopic factor, cross sections for the direct neutron-capture reactions 7Li(n,g)8Li and 8Li(n,g)9Li were calculated in the framework of a potential model.Comment: 24 pages, 8 Figures, submitted as regular article to PR

Recent developments of the Hierarchical Reference Theory of Fluids and its relation to the Renormalization Group

The Hierarchical Reference Theory (HRT) of fluids is a general framework for the description of phase transitions in microscopic models of classical and quantum statistical physics. The foundations of HRT are briefly reviewed in a self-consistent formulation which includes both the original sharp cut-off procedure and the smooth cut-off implementation, which has been recently investigated. The critical properties of HRT are summarized, together with the behavior of the theory at first order phase transitions. However, the emphasis of this presentation is on the close relationship between HRT and non perturbative renormalization group methods, as well as on recent generalizations of HRT to microscopic models of interest in soft matter and quantum many body physics.Comment: 17 pages, 5 figures. Review paper to appear in Molecular Physic

Fine-Scale in Situ Measurement of Riverbed Nitrate Production and Consumption in an Armored Permeable Riverbed

Alteration of the global nitrogen cycle by man has increased nitrogen loading in waterways considerably, often with harmful consequences for aquatic ecosystems. Dynamic redox conditions within riverbeds support a variety of nitrogen transformations, some of which can attenuate this burden. In reality, however, assessing the importance of processes besides perhaps denitrification is difficult, due to a sparseness of data, especially in situ, where sediment structure and hydrologic pathways are intact. Here we show in situ within a permeable riverbed, through injections of 15N-labeled substrates, that nitrate can be either consumed through denitrification or produced through nitrification, at a previously unresolved fine (centimeter) scale. Nitrification and denitrification occupy different niches in the riverbed, with denitrification occurring across a broad chemical gradient while nitrification is restricted to more oxic sediments. The narrow niche width for nitrification is in effect a break point, with the switch from activity “on” to activity “off” regulated by interactions between subsurface chemistry and hydrology. Although maxima for denitrification and nitrification occur at opposing ends of a chemical gradient, high potentials for both nitrate production and consumption can overlap when groundwater upwelling is strong

One sixth of Amazonian tree diversity is dependent on river floodplains

Amazonia's floodplain system is the largest and most biodiverse on Earth. Although forests are crucial to the ecological integrity of floodplains, our understanding of their species composition and how this may differ from surrounding forest types is still far too limited, particularly as changing inundation regimes begin to reshape floodplain tree communities and the critical ecosystem functions they underpin. Here we address this gap by taking a spatially explicit look at Amazonia-wide patterns of tree-species turnover and ecological specialization of the region's floodplain forests. We show that the majority of Amazonian tree species can inhabit floodplains, and about a sixth of Amazonian tree diversity is ecologically specialized on floodplains. The degree of specialization in floodplain communities is driven by regional flood patterns, with the most compositionally differentiated floodplain forests located centrally within the fluvial network and contingent on the most extraordinary flood magnitudes regionally. Our results provide a spatially explicit view of ecological specialization of floodplain forest communities and expose the need for whole-basin hydrological integrity to protect the Amazon's tree diversity and its function.Naturali

Tomato Quality In Different Postharvest Phases [qualidade Do Tomate De Mesa Em Diferentes Etapas, Da Fase De Pós-colheita]

Manual classification using wooden boxes (K) are still very common in Brazil. The main goal of this work was to characterize tomatoes of the cultivar Débora type, for maturity index, diameter and external defects at harvest time and at Retail Market, CEASA, Campinas, São Paulo State, Brazil. This research also evaluated parameters related to mechanical injury (%), weight loss (%) and quality during the main phases (1) harvest; (2) before field sorting and classification; (3) after field sorting and packaging in K boxes; (4) at CEASA. 120 fruits were taken at each stage. Defects and physical damage were evaluated using a score scale. Fruits sampled in the field showed external damages, due to bruising from bamboo stakes, insects attack and physiological and nutritional disorders. Fruits were harvested mainly at green maturity stage (48%). But, when sampled at CEASA this amount dropped to 26,3%, having mixed diameters fruits, 55,4% at 50-60mm and 43,9% over 60 mm. The results showed an increase in mechanical injury (%), weight loss (%) and loss of quality during the stages. Fruits taken directly from field showed better quality (45%) after storage for 21. days than fruits sampled at terminal market, CEASA (5,8%).262231235ANDREUCCETTI, C., FERREIRA, M.D., GUTIERREZ, A.S.D., Tavares, M., Classificação e padronização dos tomates cv. Carmem e Débora dentro da CEAGESP-SP. (2004) Engenharia Agrícola, 24, pp. 790-798BAJEMA, R.W., HYDE, G.M., Packing line bruise evaluation for Walla Walla Summer sweet onions (1995) Transactions of the ASAE, 38, pp. 1167-1171BRUSEWITZ, G.H., MCCOLLUM, T.G., ZHANG, X., Impact bruise resistance of peaches (1991) Transactions of the ASAE, 34, pp. 962-965BUSSAB, W.O., MORETTIN, P., (2002) Estatística Básica, , 5a edição, São Paulo: Saraiva, 321 pClassificação de Tomate (2000) Programa Horti&Fruti, , CEAGESP, 3pCALIMAN, F.R.B., SILVA, D.J.H., SEDIYAMA, M.A.N., Tomate para mesa: Colheita, classificação e embalagem. (2003) Informe Agropecuário, 24, pp. 128-126CASTRO, L.R., CORTEZ, L.A.B., JORGE, J.T., Influência da embalagem no desenvolvimento de injúrias mecânicas em tomates. (2001) Ciência Tecnologia Alimentos, 21, pp. 26-33CHEN, P., YAZDANI, R., Prediction of apple bruising due to impact on different surfaces (1991) Transactions of the ASAE, 34, pp. 956-961FERREIRA, M.D., (1994) Physiological responses of strawberry to handling impacts and precooling methods, , IEAS: University of Florida, Gainesville. 124 p, Tese mestradoFLUCK, R.C., HALSEY, L.H., Impact:forces and tomato bruising (1973) Florida Agricultural Experiment Station Journal Series, 5109, pp. 239-242FONTES, P.C.R., PEREIRA, P.R.G., Nutrição mineral do tomate para mesa. (2003) Informe Agropecuário, 24, pp. 27-34HALSEY, L.H., Preliminary studies of bruising of "turning" and "pink" tomatoes caused by handling practices (1955) Florida State Horticultural Society, 68, pp. 240-243KUNZE, O.R., ALDRED, W.H., REEDER, B.D., Bruising Characteristics of peaches related to mechanical harvesting (1975) Transactions of the ASAE, 18, pp. 939-94145LUENGO, R.F.A., SILVA, J.L.O., FURUYA, T., Efeito da vibração de transporte na firmeza do tomate 'Santa Clara' com acessórios em caixas de madeira e plástica (1994) XXXIV Congresso Brasileiro de Olericultura, p. 86. , 12. Anais, BrasíliaABH. pMANESS, N.O., BRUSEWITZ, G.H., MCCOLLUM, T.G., Impact bruise resistance comparison among peach cultivars (1992) HortiScience, 27, pp. 1008-1011MARSHALL, D.E., BURGESS, G.J., Apple bruise damage estimation using an instrumented sphere (1991) Applied Engineering in Agriculture, 7, pp. 677-682MORETTI, C.L., SARGENT, S.A., HUBER, D.J., GALBO, A.G., PUSCHMANN, R., Chemical composition and physical properties of pericarp, locule, and placental tissues of tomatoes with internal bruising (1998) Journal of the American Society for Horticultural Science, 123, pp. 656-600MORETTI, C.L., SARGENT, S.A., Alteração de sabor e aroma em tomates causada por impacto. (2000) Scientia Agrícola, 57, pp. 385-388PROGRAMA BRASILEIRO PARA A MODERNIZA ÇÃO DA HORTICULTURA.2003. Hoiticultura-CQH/ CEAGESP. (CQH. Documentos, 26)SARGENT, S.A., BRECHT, J.K., ZOELLNER, J.J., Sensitivity of tomatoes at mature- green and breaker ripeness stages to internal bruising (1992) Journal of the American Society for Horticultural Science, 117, pp. 119-212SEDIYAMA, M.A.N., FONTES, P.C.R., SILVA, D.J.H., Práticas culturais adequadas ao tomateiro. (2003) Informe Agropecuário, 24, pp. 19-25MOHSENIN, N.N., (1986) Physical properties of plant and animal materials, 1. , New York:Gordon Beach Science Publishers, 841pTIM, E.J., BROWN, G.K., BROOK, R.C., SCHULTE, N.L., BURTON, C.L., Impact bruise estimates for onion packing lines (1991) Applied engineering in Agriculture, 7, pp. 571-576VILELA, N.J., LUENGO, R.F.A., Viabilidade técnica e econômica da caixa Embrapa para comercialização de tomate para consumo in natura. (2002) Horticultura Brasileira, 20, pp. 222-22

Integration of Hydrothermal Carbonisation and Anaerobic Digestion for the Energy Valorisation of Grass - Supporting Data

Supplementary material for Tables and Figures in the associated paper: Integration of Hydrothermal Carbonisation and Anaerobic Digestion for the Energy Valorisation of Grass (https://doi.org/10.3390/en15103495

Estabelecimento de bactérias diazotróficas endofíticas inoculadas em cana-de-açúcar cultivadas em diferentes regiões do Brasil.

Made available in DSpace on 2011-04-09T14:12:09Z (GMT). No. of bitstreams: 1 Estabelecimentodebacteriasdiazotroficasendofiticasinoculadas.pdf: 73494 bytes, checksum: 2e7bceede145349706f34194523917ec (MD5) Previous issue date: 2011-02-04201

Caracterização química na fase de maturação da variedade apirênica BRS Linda na Região do Apodi, CE.

A qualidade dos frutos é um atributo resultante de diversos fatores edafo-climáticos que atuam simultaneamente ao longo do processo de desenvolvimento e amadurecimento. São estritamente relacionadas e podem responder pela maior ou menor aceitação pelo consumidor. As alterações químicas são mais expostas durante o processo de maturação quando proporcionam mudanças acentuadas no teor de sólidos solúveis totais (SST), açucares totais, na acidez titulável (ATT) e pH, principalmente quando ocorrem em regiões ou épocas mais quentes

Brotações e produção de uvas apirênicas em resposta à qualidade água de irrigação.

No processo de adaptação de variedades de uvas apirênicas às regiões nordestina a Crimson Seedless vem se destacando como a mais promissora para as condições Cearense. No Baixo Jaguaribe, região de maior expansão da variedade, a água de irrigação do projeto DIJA, proveniente do rio tem classificação C181, enquanto a água do projeto APODI, de poço profundo é C381

Development of a job-task-exposure matrix to assess occupational exposure to disinfectants among US nurses.

Objectives: Occupational exposure to disinfectants is associated with work-related asthma, especially in healthcare workers. However, little is known about the specific products involved. To evaluate disinfectant exposures, we designed job-exposure (JEM) and job-task-exposure (JTEM) matrices, which are thought to be less prone to differential misclassification bias than self-reported exposure. We then compared the three assessment methods: self-reported exposure, JEM and JTEM. Methods: Disinfectant use was assessed by an occupational questionnaire in 9073 US female registered nurses without asthma, aged 49–68 years, drawn from the Nurses' Health Study II. A JEM was created based on self-reported frequency of use (1–3, 4–7 days/week) of 7 disinfectants and sprays in 8 nursing jobs. We then created a JTEM combining jobs and disinfection tasks to further reduce misclassification. Exposure was evaluated in 3 classes (low, medium, high) using product-specific cut-offs (eg, <30%, 30–49.9%, ≥50%, respectively, for alcohol); the cut-offs were defined from the distribution of self-reported exposure per job/task. Results: The most frequently reported disinfectants were alcohol (weekly use: 39%), bleach (22%) and sprays (20%). More nurses were classified as highly exposed by JTEM (alcohol 41%, sprays 41%, bleach 34%) than by JEM (21%, 30%, 26%, respectively). Agreement between JEM and JTEM was fair-to-moderate (κ 0.3–0.5) for most disinfectants. JEM and JTEM exposure estimates were heterogeneous in most nursing jobs, except in emergency room and education/administration. Conclusions: The JTEM may provide more accurate estimates than the JEM, especially for nursing jobs with heterogeneous tasks. Use of the JTEM is likely to reduce exposure misclassification. (aut. ref.