Long Range Bond-Bond Correlations in Dense Polymer Solutions

The scaling of the bond-bond correlation function $C(s)$ along linear polymer chains is investigated with respect to the curvilinear distance, $s$, along the flexible chain and the monomer density, $\rho$, via Monte Carlo and molecular dynamics simulations. % Surprisingly, the correlations in dense three dimensional solutions are found to decay with a power law $C(s) \sim s^{-\omega}$ with $\omega=3/2$ and the exponential behavior commonly assumed is clearly ruled out for long chains. % In semidilute solutions, the density dependent scaling of $C(s) \approx g^{-\omega_0} (s/g)^{-\omega}$ with $\omega_0=2-2\nu=0.824$ ($\nu=0.588$ being Flory's exponent) is set by the number of monomers $g(\rho)$ contained in an excluded volume blob of size $\xi$. % Our computational findings compare well with simple scaling arguments and perturbation calculation. The power-law behavior is due to self-interactions of chains on distances $s \gg g$ caused by the connectivity of chains and the incompressibility of the melt. %Comment: 4 pages, 4 figure

Utilização de carboidratos difere marcadamente entre os onívoros de água doce jundiá (Rhamdia quelen) e tilápia-do-Nilo (Oreochromis niloticus).

Neste estudo, avaliou-se a capacidade de juvenis de jundiá em digerir ingredientes ricos em carboidratos, em comparação a um onívoro típico, com intestino longo: a tilápia-do-Nilo. Coeficientes de digestibilidade aparente do amido contido no farelo de trigo, farelo de mandioca, milho moído e quirera de arroz foram determinados para jundiá e tilápia-do-Nilo.Organizado por: Sílvio Ricardo Maurano; AQUACIÊNCIA 2012

Evaluation of whole-wheat flour blends with fat replacer.

Made available in DSpace on 2018-01-04T23:28:02Z (GMT). No. of bitstreams: 1 ID442692017v19n28p4RECyT.pdf: 4620452 bytes, checksum: 8d182598cf2b9cd8126630bdcd425932 (MD5) Previous issue date: 2018-01-04bitstream/item/170356/1/ID44269-2017v19n28p4RECyT.pd

Indicações técnicas para o cultivo da mamoneira no estado de Roraima.

bitstream/item/175136/1/0042002-mamona-smider.pd

A fast and cost-effective approach to develop and map EST-SSR markers: oak as a case study

Background: Expressed Sequence Tags (ESTs) are a source of simple sequence repeats (SSRs) that can be used to develop molecular markers for genetic studies. The availability of ESTs for Quercus robur and Quercus petraea provided a unique opportunity to develop microsatellite markers to accelerate research aimed at studying adaptation of these long-lived species to their environment. As a first step toward the construction of a SSR-based linkage map of oak for quantitative trait locus (QTL) mapping, we describe the mining and survey of EST-SSRs as well as a fast and cost-effective approach (bin mapping) to assign these markers to an approximate map position. We also compared the level of polymorphism between genomic and EST-derived SSRs and address the transferability of EST-SSRs in Castanea sativa (chestnut). Results: A catalogue of 103,000 Sanger ESTs was assembled into 28,024 unigenes from which 18.6% presented one or more SSR motifs. More than 42% of these SSRs corresponded to trinucleotides. Primer pairs were designed for 748 putative unigenes. Overall 37.7% (283) were found to amplify a single polymorphic locus in a reference fullsib pedigree of Quercus robur. The usefulness of these loci for establishing a genetic map was assessed using a bin mapping approach. Bin maps were constructed for the male and female parental tree for which framework linkage maps based on AFLP markers were available. The bin set consisting of 14 highly informative offspring selected based on the number and position of crossover sites. The female and male maps comprised 44 and 37 bins, with an average bin length of 16.5 cM and 20.99 cM, respectively. A total of 256 EST-SSRs were assigned to bins and their map position was further validated by linkage mapping. EST-SSRs were found to be less polymorphic than genomic SSRs, but their transferability rate to chestnut, a phylogenetically related species to oak, was higher. Conclusion: We have generated a bin map for oak comprising 256 EST-SSRs. This resource constitutes a first step toward the establishment of a gene-based map for this genus that will facilitate the dissection of QTLs affecting complex traits of ecological importance

Cultivar de algodoeiro herbáceo "CNPA ITA 90" para Roraima.

bitstream/item/175471/1/cot0022000-algodao9-alf.pd

Cultivar de algodoeiro herbáceo "CNPA 7H" para Roraima.

bitstream/item/175472/1/cot0012000-algodao7-alf.pd

BRS MA (Boa Vista): Cultivar de soja para Roraima.

bitstream/item/175604/1/cot0102000-sojaboavista-vicente.pd