Diffraction and an infrared finite gluon propagator

We discuss some phenomenological applications of an infrared finite gluon propagator characterized by a dynamically generated gluon mass. In particular we compute the effect of the dynamical gluon mass on $pp$ and ${\bar{p}}p$ diffractive scattering. We also show how the data on $\gamma p$ photoproduction and hadronic $\gamma \gamma$ reactions can be derived from the $pp$ and $\bar{p}p$ forward scattering amplitudes by assuming vector meson dominance and the additive quark model.Comment: 4 pages, 7 figures, added references and figures, changed structure. Contribution to Proceedings of XVIIIth Reuniao de Trabalho sobre Interacoes Hadronicas, Sao Paulo, Brazil, 22-24 May, 200

Distribuição e impacto da sigatoka-negra na bananicultura do Estado do Acre.

A sigatoka-negra (Mycosphaerella fijiensis) é a doença de maior severidade que afeta as cultivares de banana (Musa spp.) de importância econômica no mundo. Foi constatada no Brasil em 1998, no Estado do Amazonas, e tem se disseminado pelo Estado do Acre, atacando severamente as cultivares do Subgrupo Terra (AAB). Realizou-se um diagnóstico da sigatoka-negra e dos impactos econômicos causados por esta doença nos municípios do Estado do Acre. Foram visitados plantios em 16 municípios e amostras de folhas de bananeiras com sintomas característicos da doença foram coletadas para diagnóstico. Verificou-se que a sigatoka-negra estava presente em todos os municípios visitados. As conseqüências econômicas da doença podem ser evidenciadas pela redução de 42% na produção total de banana do Estado do Acre no período de 2000/2001, enquanto o valor da produção foi reduzido em 47% no ano de 2001, com repercussão nos diversos segmentos da cadeia produtiva. Nesse aspecto, observou-se que os municípios de Plácido de Castro e Acrelândia, foram os mais afetados pela sigatoka-negra

Pion-delta sigma-term

We use a configuration space chiral model in order to evaluate nucleon and delta sigma-terms. Analytic expressions are consistent with chiral counting rules and give rise to expected non-analytic terms in the chiral limit. We obtain the results $\sigma_N=46$ MeV and $\sigma_{\Delta}=32$ MeV, which are very close to values extracted from experiment and produced by other groups.Comment: 18 pages, 4 figure

Composição bromatológica e características fermentativas de silagens de capim elefante (Pennisetum purpureum Schum.) com níveis crescentes de adição do subproduto da manga (Mangifera indica L.).

Resumo: Objetivando avaliar a utilização desses subprodutos na alimentação de ruminantes, foi realizado um experimento no Núcleo de Pesquisa em Forragicultura-NPF (www.npf.ufc.br), objetivando avaliar os efeitos da adição de níveis crescentes do subproduto do processamento da manga (SM) em silagens de capim elefante. Utilizaram-se 20 silos experimentais de cano PVC (100 x 340 mm) em delineamento inteiramente casualizado com 5 níveis de adição (0; 5; 10; 15 e 20%) de SM e 4 repetições. Após 32 dias da ensilagem foram colhidas amostras para determinação dos teores de Matéria Seca (MS), Proteína Bruta (PB), Extrato Etéreo (EE), Fibra em Detergente Neutro (FDN), Fibra em Detergente Ácido (FDA), Hemicelulose (HC), Nitrogênio Amoniacal (N-NH3) e valores de pH. Os dados foram avaliados através de análises de variância e de regressão utilizando o teste ?F? ao nível de 5% de probabilidade. Os teores de MS e PB foram elevados em 0,50 e 0,03 unidades percentuais, respectivamente, a cada 1% de adição do SM. Os teores de FDN e FDA sofreram reduções de 0,51 e 0,24 unidades percentuais, respectivamente, a cada 1% de adição do SM. Os teores de N-NH3 foram reduzidos em 4,23 pontos percentuais e os valores de pH não variaram (P>0,05), apresentando valor médio de 3,29. A adição de 20% de SM melhorou a composição químico-bromatológica das silagens ao promover elevações nos teores de MS e reduções nos teores de fibra. [Chemical Composition and fermentative characteristics of Elephant grass (Pennisetum purpureum Schum.) silages added of increasing levels of mango (Mangifera indica L.) byproducts]. Abstract - Aiming at evaluating the use of those byproducts on ruminant feeding an experiment has been carried out in the Forage Research department (www.npf.ufc.br), in order to evaluate the effects of addition of increasing levels of mango processing byproducts (MB) in Elephant grass silages. Twenty experimental silos made of PVC pipe (100 x 340 mm), in a completely randomized design with 5 levels of addition (0; 5; 10; 15; and 20%) of MB and 4 replications. Upon 32 days of ensilage, samples were collected for determination of levels of dry Matter (DM), crude protein (CP), ethereal extract (EE), neutral detergent fiber (NDF), acid detergent fiber (ADF), hemicelluloses (HC), ammonia nitrogen (N-NH3 ), and pH values. Data were evaluated by analyses of variance and regression analyses using the “F” test at the 5% level. The levels of DM and CP increased of 0.50 and 0.03 percentage units, respectively, for every 1% of MB added. The levels of NDF and ADF decreased of 0.51 and 0.24 percentage units, respectively, for every 1% of MB added. The levels of N-NH3 decreased from 4 to 23 percentage units while pH values remained constant (p>0.05), with average values of 3.29. Addition of 20% of MB improved silages chemical composition by promoting an increase in the levels of MS and reduction in the levels of fiber

Evaluation of bone texture imaging parameters on panoramic radiographs of patients with Sheehan’s syndrome: a STROBE-compliant case-control study

Summary Sheehan’s syndrome (SHS) is a rare condition related to the risk of osteoporosis and evaluation of bone texture imaging features on panoramic radiographs would be suitable for this condition, which was the aim of the present study. Fractal dimension, lacunarity, and trabecular morphologic aspects were significantly altered in these patients. Introduction SHS is an important public health problem particularly in developing countries. It is characterized as postpartum hypopituitarism secondary to obstetric complications-related ischemic pituitary necrosis that shows significant systemic metabolic repercussions. Thus, this study aimed to evaluate bone texture parameters in digital panoramic radiographs of patients with SHS. Methods A case-control study was conducted with 30 SHS patients from an Endocrinology and Diabetology Service of reference in Brazil, and 30 age- and sex-matched healthy controls. A custom computer program measured fractal dimension, lacunarity, and some morphologic features in the following mandibular regions of interest (50 × 50 pixels): below the mental foramen (F1), between the first and second molars (M1), and at the center of the mandibular ramus (R1). Results The fractal analysis showed a statistically significant difference between the studied groups in all regions of interest. The fractal dimension in F1 (p = 0.016), M1 (p = 0.043), and R1 (p = 0.028) was significantly lower in SHS group, as well as lacunarity in R1 (p = 0.008). Additionally, several morphologic features were statistically significant in the SHS group (p < 0.05). Conclusion Therefore, individuals with SHS showed altered imaging texture parameters on panoramic radiographs, which reflect a smaller spatial organization of the bone trabeculae and, possibly, a state of reduced mineral bone density

Piramidação de estratégias biotecnológicas para o controle de nematoides das galhas na cultura da soja.

Soybeans are the most important crop grown in Brazil due to their economic profit and the multifunctional nature of its grain. Among the challenges in soybean production, the parasitism by root-knot nematodes (RKN) of the genus Meloidogyne stands out

Educação continuada em neurologia pela INTERNET

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