Báo cáo khoa học: "Control ofxylogenesis within the whole treeR " pot

... controls the size of the vessels through its control of the development, height and shape of the tree. The height and rate of branching determine the levels of the polar ... On the other hand, in large trees, the very long distances from the young leaves to the roots enable a substantial decrease in auxin levels in the lower par...

Ngày tải lên: 09/08/2014, 02:21

... Gif-sur-Yvette, France Introduction The aggregation of the prion Ure2p is at the origin of the [URE3] trait in the baker’s yeast Saccharomyces cerevisiae [1,2]. The propagation of the prion element [URE3] ... within protein complexes; (b) the character- ization of the distance constraints within a protein com- plex; and (c) the assessment of regions exposed or not to...

Ngày tải lên: 15/03/2014, 00:20

... with the hypothe- ses presented above. This restrictiveness concerns both the size of the lexicon and the ways of carrying out disambiguation. It is always difficult to define criteria for the ... development of the parser to be presented has been supported by the Swedish Research Council for the Humanities. The parser is called MorP, for morphology based parser, and...

Ngày tải lên: 18/03/2014, 02:20

... using the perceptron algorithm. We follow that paper in fixing the weight of the generative model, rather than learning the weight along the the weights of the other perceptron fea- tures. The value ... in the example, the attachment sites are under the NP or the S. There will also be a set of possible chains terminating in the next word – there are three in the examp...

Ngày tải lên: 23/03/2014, 19:20

... Since the AMMs provide a better fit for the more frequent pairs in the training data, they might end up providing too good p exp -estimates for the true collocations from the beginning. Further ... the optimum for AMM-divergence varies slightly. It is likely that the drop in performance for the larger AMM-based measures is due to the AMMs learning the collocations themselve...

Ngày tải lên: 30/03/2014, 21:20

... with the dark region surrounding the LM. Yet another is the union of the light and dark regions with the interior of the LM. And yet another is the cor- rect one, which is not closed at the ... part of the definition of "above" is that the TR is not in the inte- rior of the LM, and since the shape of the interior of the LM cannot be derived from t...

Ngày tải lên: 31/03/2014, 06:20

... appears related to their histories of partial extinctions and their common fate in the final one. It was the striking concurrence of the outcome of this research and the theoretical last ... population being the biggest. Hypothetically then, the time discrepancy of approximately 30 000 years between the last dinosaur bone found in the Mo...

Ngày tải lên: 09/08/2014, 22:22

... solvent. The regions exhibiting the lowest exchange (below 40% D occupancy), in other words, the highest protection, define the core of the protein’s N state [21]. For the T domain, these were the ... In the case of the T domain, the MG state corresponds to the functional state, which initi- ates the translocation of the catalytic domain. Here, the data allowed iden...

Ngày tải lên: 16/02/2014, 09:20

... and protein synthesizing capa- city. This would be preferable to placing all the genes involved in the pathway in the same operon; the cell can then respond quickly to changes in the environ- ment ... copy of the gene on the chromosome transcribed from synthetic promoters. At first we tried to use the natural leader of the pyk gene, but this resulted in merely 25% increased P...

Ngày tải lên: 19/02/2014, 17:20

... the family [4]. The mechan- ism, hotly debated for many years, involves the attack of the protease on the P1-P1¢ bond in the reactive cen- tre loop (RCL) of the serpin [5]. The catalysis of the peptide ... at the acyl intermediate by the unique action of the serpin, whereby the RCL of the serpin inserts into the major A b -sheet causing the protease to be rapid...

Ngày tải lên: 20/02/2014, 02:21