báo cáo khoa học: " Pollen development in Annona cherimola Mill (Annonaceae) Implications for the evolution of aggregated pollen" pdf

... the pollen grains to undergo the 180° turning [22,23]. In the formation of the pollen wall, callose dissolution occurs concomitantly with the layering of the exine [54] and the formation of the ... and the development of inward facing intines may play a role in protecting pollen against desiccation. Conclusion The results obtained in this work support...

Ngày tải lên: 12/08/2014, 03:21

... extraction. One of these is the arity of the relation. Another one is the locality of the relation instance in an average mentioning. A third one is the types of the relation arguments: Are they named ... D ×LOG(n× df(t,d i ) df(t,d j ) j=1 n ∑ ) , otherwise where • df(t, d i ): is the document frequency of a term t in the domain d i • D: the number of...

Ngày tải lên: 23/03/2014, 18:20

... be involved in signaling processes related to the regulation of synaptic plasticity by binding to the adaptor protein PSD95. This protein contains several PDZ domains one of which binds to the ... C-terminal amino acids of the NMDA receptor. This particular feature was exploited for the retrieval of a PSD95-containing complex by immobilizing a hexapeptide corresponding t...

Ngày tải lên: 31/03/2014, 07:20

... and capture the linguist’s generalizations on the level of code. The engineering challenge is to make the grammar scalable, reusable, and maintainable. Too many grammars implemented in the history of computational ... matter of a few working days. Once it is built for one language, porting it to other lan- guages mainly requires writing the lexicon. By the use of th...

Ngày tải lên: 22/02/2014, 02:20

... model for the interaction of the preprotein with the receptor. The 16 ⁄ 23 chimera is retarded dur- ing translocation; early in the process, the protein assumes a structure within the membrane in ... the mechanisms involved in the secretory and twin-arginine translocase pathways used for the transport of proteins into the lumen, with an emphasis on the di...

Ngày tải lên: 07/03/2014, 03:20

... radiation response of tumor cells. However, the basis of the link between the signaling pathway and the apoptotic cell- death machinery in response to ionizing radiation remains largely unclear. The aim of our ... h, coinciding with downregulation of the Bcl-2 pro- tein level. We next examined the involvement of Bcl-2 phosphorylation in radiation-induced mitochondr...

Ngày tải lên: 07/03/2014, 05:20

... FEBS sulfate-bound form, including one containing a novel metal binding site. Furthermore, they show structural heterogeneity in their inhibitor-bound forms, highlight- ing the potential to extend future inhibitors ... within the tail downstream of the thrombin cleavage site in the N-terminal extension containing the His tag) was observed at a crystal lattice interface between...

Ngày tải lên: 23/03/2014, 07:20

... Krieger (2000) for proof that this terminates, and finds the appropriate fixed-point. Having computed the least fixed-point , the next step is to compute the set of corresponding CF productions. For each r in ... recognition. In Proceedings of the NATO Advanced Studies Institute, 1998. R. Moore. Removing left-recusion from context-free grammars. In Proceedings of 1st Me...

Ngày tải lên: 31/03/2014, 04:20

... class="bi x0 y2 w1 h 3" alt =""

Ngày tải lên: 07/08/2014, 18:21

... present in 50% of the scans obtained 2-6 and 6-18 months before the diag- nosis of pancreatic cancer, but noted such CT findings in only 7% of the scans obtained more than 18 months before diagnosis. CT ... proportion of asymptomatic incidental pancreatic tumors before the clinical diagnosis of pancreatic cancer. Pancreatic duct dilatation and cutoff are early findings a...

Ngày tải lên: 09/08/2014, 04:21