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GENETICA NA AGROPECUARIA PDF

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In our opinion, this structure is unsatisfactory for two reasons: 1 We believe that the material which gives the X-ray diagrams is the salt, not the free acid.

Without the acidic hydrogen atoms it is not clear what forces would hold the structure toge- ther, especially as the negatively charged phosphates near the axis will repel each other. Another three-chain structure has also been suggested by Fraser in the press.

Genética na Agropecuária

In his model the phosphates are on the outside and the bases on the inside, linked together by hydrogen bonds. This structure as described is rather ill-defined, and for this reason we shall not comment on it. There is a residue on each chain every 3.

As the phosphates are on the outside, cations have easy access to them. The structure is an open one, and its water content is rather high. At lower water contents we would expect the bases to tilt so that the structure could become more compact.

The novel feature of he structure is the manner in which the two chains are held together by the purine and pyrimidine bases. The planes of the bases are perpendicular to the fibre axis.

They are joined together in pairs, a single base from one chain being hydrogen-bonded to a single base from the other chain, so that the two lie side by side with identical z- co-ordinates.

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One of the pair must be a purine and the other a pyrimidine for bonding to occur. The hydrogen bonds are made as follows: purine position 1 to pyrimidine position 1 purine position 6 to pyrimidine position 6. If it is assumed that the bases only occur in the structure in the most plausible tautomeric forms that is, with the keto rather than the enol configurations it is found that only specific pairs of bases can bond together.

These pairs are: adenine purine with thymine pyrimidine , and guanine purine with cytosine pyrimidine.

In other words, if an adenine forms one member of a pair, on either chain, then on these assumptions the other member must be thymine; similarly for guanine and cytosine. The sequence of bases on a single chain does not appear to be restricted in any way.

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However, if only specific pairs of bases can be formed, it follows that if the sequence of bases on one chain is given, then tho sequence on the other chain is automatically determined. It has been found experimentally3,4 that the ratio of the amounts of adenine to thymine, and the ratio of guanine to cytosine, are always very close to unity for deoxyribose nucleic acid.

Entre e foram realizados mais de Em havia 6. Moschini et al.

De acordo com Trigo et al. Segundo Trigo et al. Segundo estes, as supostas barreiras aos produtos GM colocadas pela Europa cria um mercado para os produtos convencionais.

Essa queda de market-share da soja dos Estados Unidos foi resultado de dois problemas: queda na produtividade e aumento dos custos Wilkinson, ; Pereira, NOTAS 1. Biotecnologia Simplificada. UFV, The farm level impact of using Bt maize in Spain.

Newsletters, Ano 4, n.

Agricultural biotechnology: updated benefit estimates. Impact of new technologies on agricultural production systems: The cases of agricultural biotechnology and automatic milking. In: Bouquiaux, J.

Genética na Agropecuária PDF

New Technologies and Sustaintability. Who benefits from biotechnology? World Development, forthcoming, Agrianual, Biotecnologia vegetal e produtos afins: sementes, mudas e inculantes. An Analysis of 40 Case Studies.Eu Primata - Frans de Waal.

Agriculture and Human Values, n. Vertebrados - - Kenneth Kardong.

The sequence of bases on a single chain does not appear to be restricted in any way. Abbas, Andrew H. Pesquisador do NEA e do Geopi buainain eco.

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