explain the role of data link layer in osi model

Ngày tải lên: 21/03/2014, 22:01

... University Regional Learning Alliance – workforce development and training/collaborations with business and industry; meeting the training and education needs of businesses within 60 mile radius in Northern Allegheny ... $28,000 in average annual salary) Preserving Value Continuing education is important to preserving the market value of specialized education – particularly in professional fields Continuing education ... University Small Business Initiative in the Frehn Center for Management; offering information and assistance to individuals and groups planning to start a new business Indirect Contributions...

Ngày tải lên: 21/02/2014, 01:20

... designed on the basis of side-chain packing criteria from a modelled structure of the enzyme resulted in restor- ation of the energy of activation to the levels of the native enzyme and in an increased ... that the E a value in this temperature range is considerably lowered. On the basis of the model, the behavior of the G261A variant can be interpreted in terms of constraints introduced by the ... respectively. By introducing an Ala residue in the place of Gly it is expected that the conformational flexibility of the main chain can be constrained with a minimum perturba- tion of the local structure,...

Ngày tải lên: 22/02/2014, 04:20

... antigen in itself [7,20]. At least for these antibodies, the role of the V L domain might be to increase the affinity by supporting the V H domain. The phenomenon may also be observed in the chain ... clarify the effect of the interface mutations on the antigen- binding affinity. To investigate systematically this unsought relationship between the antigen-binding affinity of Fv and the V H ⁄ V L interaction ... Although the Fv was designed based on HyHEL-10, it is not clear whether or not H39 is dominantly tuning the V H ⁄ V L interaction of other Fvs, including HyHEL-10. In addition, the effect of the H39...

Ngày tải lên: 07/03/2014, 12:20

... example, in the case of question Q209: “Who invented the paper clip ?”, the expected answer type is PERSON and so is the subject of the verb invented , lexicalized as the nominalization inventor. ... mountain; (b) lava IS-PART of vol- cano, and moreover it is a part coming from the inside; and (c) fragments of lava have all the prop- erties of lava, the following question semantic The Role of ... Question-Answering Track Experiments using PIRCS. Proceedings of the Text Re- trieval Conference (TREC-9), pages 26–35, 2000. Dan Magerman. Statistical decision-tree models of parsing. In Proceedings of the...

Ngày tải lên: 08/03/2014, 05:20

... giving is instrumental in maintaining social ties and serves as a mean of symbolic communication in social relationship. Most of the researches before and after the appearance of Sherry’s model ... described in details the stages of the whole gift- exchange processes, researchers have examined the influence of many variables within these stages. This model divides gifting activities into ... their brand attitude, may suggest an interesting implication for the new brand advertising strategy. Instead of focusing on the content of the message which only emphasizes the benefits of...

Ngày tải lên: 14/03/2014, 14:20

... portion of the savings in that account for school and whether log of net worth or categorical net worth is included in the model. Moreover, when youth savings is included in regression models, ... school. Conley (2001) finds that a doubling of net worth results in an 8.3% increase in the probability of attending college. Further, when net worth is included in the model, Black youth are ... youth. Youth savings. Youth were asked in 2002 whether they had a savings or bank account in their name. If they had an account, they were also asked whether they were saving some of this money...

Ngày tải lên: 15/03/2014, 10:20

... that the increase of Glc6P in the presence of S4048 was caused by the inhibition of Glc6P hydro- lysis in the absence of detectable changes in glucose phosphorylation. S4048 causes inactivation of ... glu- cokinase and hexokinase I in distinct pools [3,24], or by the involvement of mechanisms, additional to Glc6P, in mediating the effects of glucokinase over- expression. As glucokinase binds ... control of glycolysis and glycogen synthesis by glucokinase overexpres- sion. The validity of S4048 for testing the role of Glc6P was supported by its lack of effect on glucokinase binding and...

Ngày tải lên: 16/03/2014, 14:20

... documents and find that the fea- ture vectors corresponding to some of these docu- ments (particularly the short ones) have all zeroes in them. In other words, none of the bigrams from the training set ... cap- turing two different situations, one in which the author himself likes the movie, and in the other, the author’s cousin likes the movie. The over- generalization resulting from these “stemmed” ... available. 612 Proceedings of the COLING/ACL 2006 Main Conference Poster Sessions, pages 611–618, Sydney, July 2006. c 2006 Association for Computational Linguistics Examining the Role of Linguistic Knowledge...

Ngày tải lên: 17/03/2014, 04:20

... tight binding affinity was demonstrated towards lauric acid, resulting in the synthesis of mainly x-1 hydroxylated lauric acid, suggesting a role in the lipid oxidative metabolism. Interestingly, the ... enzymes. The FUM6 protein (CYP505B1) inter- venes in one of the first steps in fumonisin synthesis by hydroxylation of the polyketide-amino acid at C-14 and C-15 (Fig. 3). Fum6 deletion mutants of F. ... occurring in the soil. Furthermore, branched chain fatty acids make up 80% of the fatty acid content of the Bacillus sp. mem- branes and when the hydroxylation of these substrates was studied in...

Ngày tải lên: 22/03/2014, 16:21

... the transaction from the vantage point of firm A, the floating- rate payer. The cost of synthetic floating-rate financing is determined by the cost of servicing fixed-rate debt plus the net cost of ... to the desire on the part of firms to hedge cash flows against the effects of interest rate volatility. The timing of the appearance of interest rate swaps, coming as it did during a pe- riod of ... perhaps the best-known exposition of this viewpoint, which is based on the principle of comparative advantage. In international trade theory, the principle of comparative advantage explains the economic...

Ngày tải lên: 22/03/2014, 17:20

... rapidly, causing the unfolding of one of the I27 modules in the chain. Unfolding then extends the over- all length of the protein, relaxing the pulling force to a low value. As the slack in the length ... stretching a polyprotein re- sults in a well-defined series of step increases in length, mark- ing the unfolding and extension of the individual modules in the chain. [37] The size of the observed steps ... b-strands of the I27 protein during the main unfold- ing barrier. [39] To further validate this view and gain insight into the role of solvent hydrogen bonds in protein unfolding, we repeated these...

Ngày tải lên: 22/03/2014, 18:20

... of a federation and so are said to operate in the interest of the users rather than in the interest of the service providers. These service providers are called “relying parties.” In this model, ... build- up of profiles that others hold about him. Method of linking accounts/ learning if they belong to the same person There is no linking between accounts and no information flow between them. ... managing and protecting digital identities, with a view to strengthening confidence in the online activities crucial to the growth of the Internet Economy. The primer is a product of the Working...

Ngày tải lên: 23/03/2014, 23:21

... (glycero-)sphingolipids. In addition the fatty acid chains of the phospholipids composing these rigid domains are generally more saturated than those in the lipids of the surrounding membrane. In fact, this ... dur- ing lipid raft isolation. Moreover, these studies have provided some insights into the significance of the localization of the P2X 7 receptors in lipid rafts regard- ing the regulation of intracellular ... muscarinic receptors, endo- thelin receptors, rhodopsin) are located in lipid rafts [65–70] where they are in close proximity to their transducing GTP-binding protein (Gs, Gi, Go, Gq and transducin...

Ngày tải lên: 30/03/2014, 02:20

... suggested by the lack of coincidence of the changes in relative fluorescence intensity and in  k and by the hysteresis of the reversibility process (Fig. 4). At the end of the transition, the intrinsic ... that of the wild-type; however, the integrity of the calcium bind- ing site formed by Asp287 and Glu53 is essential for interaction with the cation in 7.9 m GdmCl. An interesting finding of the ... pfLamA in the native state, indepen- dently of their interaction with calcium. The role of electrostatic interactions in protein stability has been widely investigated and the stabilizing effect of...

Ngày tải lên: 30/03/2014, 04:20

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Ngày tải lên: 08/04/2014, 18:33

Ngày tải lên: 18/06/2014, 17:20