Procedimentos para indução de calos embriogênicos em algodão.

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NMR and LC-MS assessment of compound variability of common bean (Phaseolus vulgaris) stored under controlled atmosphere.

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G-Structures, Fluxes and Calibrations in M-Theory

We study the most general supersymmetric warped M-theory backgrounds with non-trivial G-flux of the type R^{1,2} x M_8 and AdS_3 x M_8. We give a set of necessary and sufficient conditions for preservation of supersymmetry which are phrased in terms of G-structures and their intrinsic torsion. These equations may be interpreted as calibration conditions for a static ``dyonic'' M-brane, that is, an M5-brane with self-dual three-form turned on. When the electric flux is turned off we obtain the supersymmetry conditions and non-linear PDEs describing M5-branes wrapped on associative and special Lagrangian three-cycles in manifolds with G_2 and SU(3) structures, respectively. As an illustration of our formalism, we recover the 1/2-BPS dyonic M-brane, and also construct some new examples.Comment: 40 pages; v2: one reference added, typos correcte

A New Chanidae (Ostariophysii: Gonorynchiformes) from the Cretaceous of Brazil with Affinities to Laurasian Gonorynchiforms from Spain

Based on specimens originally referred to as “Dastilbe minor”, a nomem-nudum, we describe a new genus of Chanidae †Nanaichthys longipinnus nov. gen. and sp. which exhibits several diagnostic characters such as the absence of orbitosphenoid and basisphenoid, anteriorly displaced quadrate-mandibular articulation, laterally expanded supraneurals, an acute angle between the preopercular limbs, expansion at the angle between the preopercular limbs, and a curved maxillary articular process. Its occurrence and supposed relationship within the Chanidae reinforce the influence of the Mediterranean Tethys over the Gondwanan main rift system prior to the Aptian/Albian highstands

Effects of Orbital Degeneracy and Electron Correlation on Charge Dynamics in Perovskite Manganese Oxides

Taking the orbital degeneracy of $e_g$ conduction bands and the Coulomb interaction into account in a double-exchange model, we investigate charge dynamics of perovskite Mn oxides by the Lancz$\ddot{\rm o}$s diagonalization method. In the metallic phase near the Mott insulator, it is found that the optical conductivity for a spin-polarized two-dimensional system exhibits a weight transfer to a broad and incoherent structure within the lower-Hubbard band together with a suppressed Drude weight. It reproduces qualitative feature of the experimental results. As an orbital effect, we find that an anomalous charge correlation at quarter filling suppresses the coherent charge dynamics and signals precursor to the charge ordering.Comment: 4 pages LaTeX including 3 PS figures, to appear in J. Phys. Soc. Jp

Revisiting soliton contributions to perturbative amplitudes

Open Access funded by SCOAP3. CP is a Royal Society Research Fellow and partly supported by the U.S. Department of Energy under grants DOE-SC0010008, DOE-ARRA-SC0003883 and DOE-DE-SC0007897. ABR is supported by the Mitchell Family Foundation. We would like to thank the Mitchell Institute at Texas A&M and the NHETC at Rutgers University respectively for hospitality during the course of this work. We would also like to acknowledge the Aspen Center for Physics and NSF grant 1066293 for a stimulating research environment

Indução de embriogênese somática em algodão.

A produção de embriões somáticos mediante o cultivo de tecidos in vitro, é uma técnica que permite a obtenção de embriões em grande escala, constituindo-se em uma ferramenta importante nos programas de melhoramento genético de algumas culturas. Objetivando-se induzir a formação de calos embriogênicos em algodão a partir da embriogênese somática, germinaram-se, in vitro, sementes da cultivar Coker 312 e, sete dias apás a germinação, segmentos de hipocótilo foram cultivados durante quatro semanas em placas de Petri, para a indução de calos, em diferentes meios. Para constatação da rediferenciação dos tecidos e da formação de embriódes, retiraram-se amostras de calos subcultivados na ausência de fitorreguladores e analisados por microscopia eletrônica de varredura. Obtiveram-se calos de coloração amarelo-esverdeado e com aspecto frivel no tratamento com 2,4 D a partir de segmentos de hipocótilo da cultivar Coker 312, com maior proliferação a partir da quarta semana de cultivo. Calos da mesma cultivar induzidos em meio MS1 (2,4D e cinetina), quando subcultivados em meio básico MS, sem de adição de fitorreguladores, desenvolveram calos embriogênicos; os calos induzidos em meio MS2 (ANA e cinetina) não se diferenciaram quando transferidos para o meio MS, mas se observou coloração escura.bitstream/CNPA/19894/1/BOLETIM79.pd