Carotenoid biosynthesis structural genes in carrot (Daucus carota): isolation, sequence-characterization, single nucleotide polymorphism (SNP) markers and genome mapping.

Carotenoid pigments are important components of the human diet and carrots are the main dietary sources of the vitamin A precursors IX- and /3- carotene. Carotenoids play essential biological roles in plants and the genes coding for the carotenoid pathway enzymes are evolutionarily conserved, but little information exists about these genes for carrot. In this study, we utilized published carrot sequences as well as heterologous PCR approaches with primers derived from sequence information of other plant species to isolate 24 putative genes coding for carotenoid bio-synthesis enzymes in carrot. Twenty-two of these genes were placed on the carrot genetic linkage map developed from a cross between orange-rooted and white- rooted carrot. The carotenoid genes were distributed in eight of the nine linkage groups in the carrot genome recommending their use for merging maps. Two genes co-localized with a genomic region spanning one of the most significant quantitative trait loci (QTL) for carotenoid accumulation. Carotenoid biosynthesis cDNAs linked to root color mutations and to QTL for carotenoid accumulation may suggest a functional role for them as candidate genes. RACE PCR and reverse transcriptase PCR were used to amplify the full-length transcript for twenty expressed carotenoid biosynthesis genes and sequences were submitted to GenBank. The cloning and sequence information of these' genes is useful for PCR-based expression studies and may point toward transgenic approaches to manipulate carotenoid content in carrot

On the use of the group SO(4,2) in atomic and molecular physics

In this paper the dynamical noninvariance group SO(4,2) for a hydrogen-like atom is derived through two different approaches. The first one is by an established traditional ascent process starting from the symmetry group SO(3). This approach is presented in a mathematically oriented original way with a special emphasis on maximally superintegrable systems, N-dimensional extension and little groups. The second approach is by a new symmetry descent process starting from the noninvariance dynamical group Sp(8,R) for a four-dimensional harmonic oscillator. It is based on the little known concept of a Lie algebra under constraints and corresponds in some sense to a symmetry breaking mechanism. This paper ends with a brief discussion of the interest of SO(4,2) for a new group-theoretical approach to the periodic table of chemical elements. In this connection, a general ongoing programme based on the use of a complete set of commuting operators is briefly described. It is believed that the present paper could be useful not only to the atomic and molecular community but also to people working in theoretical and mathematical physics.Comment: 31 page

Herdabilidade de caracteres de raiz utilizando-se diferentes grupos varietais de cenoura cultivados durante a primavera no Brasil Central.

Suplemento. Resumo 508. Trabalho apresentado no 47. Congresso Brasileiro de Olericultura, 4. Simpósio Brasileiro sobre Cucurbitáceas, 2007. Porto Seguro

Herdabilidade de caracteres de raiz utilizando-se diferentes grupos varietais de cenoura cultivados durante a primavera no Brasil Central.

Suplemento. Resumo 508. Trabalho apresentado no 47. Congresso Brasileiro de Olericultura, 4. Simpósio Brasileiro sobre Cucurbitáceas, 2007. Porto Seguro

Distância genética entre acessos de grupos varietais de cenoura obtidos de programas de melhoramentos de três continentes.

Suplemento. Resumo 494. Trabalho apresentado no 47 Congresso Brasileiro de Olericultura, 4. Simpósio Brasileiro sobre Cucurbitáceas, 2007. Porto Seguro

Preferência de Helicoverpa armigera (Lepidoptera: Noctuidas entre genótipos de tomateiros).

Resumo 0860

Properties of Squeezed-State Excitations

The photon distribution function of a discrete series of excitations of squeezed coherent states is given explicitly in terms of Hermite polynomials of two variables. The Wigner and the coherent-state quasiprobabilities are also presented in closed form through the Hermite polynomials and their limiting cases. Expectation values of photon numbers and their dispersion are calculated. Some three-dimensional plots of photon distributions for different squeezing parameters demonstrating oscillatory behaviour are given.Comment: Latex,35 pages,submitted to Quant.Semiclassical Op

Resposta de espécies florestais do Cerrado à espécies virais dos gêneros

Este trabalho objetivou a avaliação do potencial de espécies florestais como hospedeiras de vírus economicamente importantes. Espécies de Potyvirus (Potato virus Y - PVY) e de Tospovirus (Groundnut ringspot virus - GRSV e Tomato spotted wilt virus -? TSWV) foram inoculadas mecanicamente via extrato vegetal tamponado em 22 espécies em plantas nativas do Bioma Cerrado.Resumo 304_