Modified Gravity on the Brane and Dark Energy

We analyze the dynamics of an AdS5 braneworld with matter fields when gravity is allowed to deviate from the Einstein form on the brane. We consider exact 5-dimensional warped solutions which are associated with conformal bulk fields of weight -4 and describe on the brane the following three dynamics: those of inhomogeneous dust, of generalized dark radiation, and of homogeneous polytropic dark energy. We show that, with modified gravity on the brane, the existence of such dynamical geometries requires the presence of non-conformal matter fields confined to the brane.Comment: Revised version published in Gen. Rel. Grav. Typos corrected, updated reference and some remarks added for clarity. 11 pages, latex, no figure

Plantio e uso da palma forrageira na alimentação de bovinos leiteiros no semiárido brasileiro.

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Ocorrência de parasitos gastrintestinais em matrizes caprinas durante período chuvoso em Quixadá-CE.

Resumo: O presente estudo teve como objetivo determinar a ocorrência de parasitos gastrintestinais de matrizes caprinas de propriedades rurais do município de Quixadá-CE, durante o período chuvoso. Foram realizadas coletas de fezes de 71 cabras, durante o mês de maio de 2013, em dez propriedades rurais distribuídas nos distritos de Cipó dos Anjos, Daniel de Queiroz, Tapuiará, Califórnia e Sede. Foram realizados exames parasitológicos de Contagem de Ovos por Gramas de Fezes (OPG) e cultura de larvas. As análises estatísticas foram realizadas pelo teste T de Student. A ocorrência de parasitos gastrintestinais em matrizes das dez propriedades de Quixadá, CE foi de 74,65% (53/71). A média geral de OPG para ovos do tipo Strongyloidea foi de 493 e do tipo Strongyloides foi de 61 ovos. Em 100% das propriedades foram observados pelo menos um animal com presença de ovos tipo Strongyloidea no OPG, sendo maior essa ocorrência nos animais do distrito Sede e menor em Daniel de Queiroz. O gênero Haemonchus foi o mais encontrado na coprocultura com 68,06% de larvas. A ocorrência no período chuvoso de parasitos em matrizes nas dez propriedades rurais de Quixadá estudadas é alta, porém o nível de infecção é leve e Haemonchus foi o gênero mais encontrado nessa época do ano. [Occurrence of gastrointestinal parasites in goats matrices during the rainy season in Quixadá-ceará]. Abstract: The present study aimed to determine the occurrence of gastrointestinal parasites of goats matrices of rural farms Quixadá-CE during the rainy season. Stool samples were collected from 71 goats, during the month of May 2013, in ten farms distributed in the districts of the Angels Cipo, Daniel de Queiroz, Tapuiará, California and Headquarters. Were performed exam parasitological of Egg Count in Grams Stool (EPG) and larval culture. Statistical analyzes were performed by Student T test. The occurrence of gastrointestinal parasites in matrices of ten properties Quixadá, CE was 75.65% (53/71). The overall mean EPG for eggs Strongyloidea type was 493 and type Strongyloides was 61 eggs. In 100% of the properties were observed at least one animal with the presence of eggs Strongyloidea type in EPG, this being higher occurrence in animals of the Headquarters district and smaller in Daniel de Queiroz. The genus Haemonchus was most frequently found in larvae culture with 68.06%. The occurrence of parasites in matrices of ten farms Quixadá in the rainy season is high, but the level of infection was mild and Haemonchus is the genre most often found this time of year

Vermicompost biostimulants: nutrients and auxin for root growth.

The present study was undertaken to establish if biostimulants diferently extracted from vermicompost causes root development and how mineral nutrients and plant growth substances are associated to diferent extraction methods

Conformal Bulk Fields, Dark Energy and Brane Dynamics

In the Randall-Sundrum scenario we analyze the dynamics of a spherically symmetric 3-brane when the bulk is filled with matter fields. Considering a global conformal transformation whose factor is the $Z_2$ symmetric warp we find a new set of exact dynamical solutions for which gravity is bound to the brane. The set corresponds to a certain class of conformal bulk fields. We discuss the geometries which describe the dynamics on the brane of polytropic dark energy.Comment: 12 pages, latex, 2 figures. Talk given by Rui Neves at the Fourth International Conference on Physics Beyond the Standard Model, Beyond the Desert 03, Fundamental Experimental and Theoretical Developments in Particle Physics, Accelerator, Non-Accelerator and Space Approaches, Max Planck Institut f. Kernphysik/MPI Heidelberg, Castle Ringberg, Tegernsee, Germany, 9-14 June 2003. To be published in the Conference Proceedings, Springer-Verlag, Heidelberg, German

Conservação de alimentos.

Neste capítulo serão discutidos os conceitos básicos sobre a conservação de alimentos na forma de feno e silagem, visando-se à alimentação de caprinos e ovinos nas regiões semiáridas

Crescimento e produtividade da parte aérea da mandioca, maniçoba e pornunça.

Este trabalho foi conduzido com o objetivo de avaliar o crescimento e a produtividade da mandioca (Manihot esculenta Crantz.), maniçoba (Manihot glaziowii Mull.) e do híbrido natural pornunça