Báo cáo khoa học: "PRECISE N-GRAM PROBABILITIES FROM STOCHASTIC CONTEXT-FREE GRAMMARS" pptx

... then parsed using an automaton- based parser. We present algorithms for con- structing automata from elementary structures, merging and minimising them, and string recog- nition and parse recovery ... Recent work by Evans and Weir (1997) and Chen and Vijay-Shanker (1997) addresses this problem from two different perspectives. Evans and Weir (1997) outline a technique for com- pi...

Ngày tải lên: 20/02/2014, 18:20

... author’s native language from text in a dif- ferent language. We compare two state of the art methods for Tree Substitution Grammar induction and show that features from both methods outperform ... regression with features extracted from parse trees produced by a state of the art statistical parser. They investigated two classes of features: rerank- ing features from the Charniak pars...

Ngày tải lên: 07/03/2014, 18:20

... the productions for lexical assignments (type 5). By varying il from n to 1, jz from i + 2 to n, i~ from j3 to il + 1, and i3 from i.~ + 1 to j3 we look for a group of four productions (as ... algorithm we should have loop statements that allow i, j to range from 1 through n such that the length of the spanned substring starts from 1 (i - j) and increases to n (i = 1 and j n...

Ngày tải lên: 08/03/2014, 18:20

... for computing n-gram probabil- ities from stochastic context-free grammars, a procedure that can alleviate some of the standard problems associated with n-grams (estimation from sparse data, ... in CNF. Probabilities from expectations The first key insight towards a solution is that the n-gram probabilities can be obtained from the associated expected frequencies fo...

Ngày tải lên: 17/03/2014, 09:20

... the binding pocket and 7.75 A ˚ from the T1 copper atom (Fig. 5D). Fig. 1. Sequence alignment of McoP with CotA laccase from Bacillus subtilis (1GSK) and CueO from Escherichia coli (1KV7). The ... metallo-oxidase from Aquifex aeolicus. Biochim Biophys Acta 1794, 75–83. 5 Fernandes AT, Soares CM, Pereira MM, Huber R, Grass G & Martins LO (2007) A robust metallo-oxidase from the h...

Ngày tải lên: 18/02/2014, 04:20

... manage- ment from the user and present an intuitive, user-friendly interface from which this necessary metadata can be obtained. The kineticswizard can be launched auto- matically from the instrument ... web services. Kinetic data can be exported from SABIO-RK in SBML format and experimen- tal data exported from MeMo-RK in SBRML format. N. Swainston et al. Enzyme kinetics: from in...

Ngày tải lên: 18/02/2014, 04:20

... enzymes operate near saturation and the kinase readily dissociates from the phosphorylated target (and, likewise, the phosphatase from the unphosphory- lated target), a steep threshold response, ... machinery involving multiply phosphorylated proteins allows DNA replication to start simultaneously from multiple origins of replication [20,107–110]. We have shown recently in a model of re...

Ngày tải lên: 18/02/2014, 08:20

... reverse transcription, PCR and real-time PCR mRNA was extracted from cells and tissue (obtained with local ethical permission from the Masaryk Institute ethics committee) using the Qiagen RNeasy ... After the extraction, RT-PCR was performed using the Omniscript RT kit from Qiagen (Valencia, CA, USA) and pfu polymerase from Stratagene, following the manufacturer’s suggested protocols....

Ngày tải lên: 18/02/2014, 17:20

... Sephadex G-25 and G-50 from Amersham Biosciences (GE Healthcare, Piscataway, NJ), Cleland’s reagent (dithio- threitol) from Calbiochem (San Diego, CA), and Zinquin ester from Molecular Probes ... aldehydes release zinc from isolated proteins and in cultured cells and that the released zinc affects phos- phorylation signaling and gene expression. Results Aldehydes release zinc from z...

Ngày tải lên: 19/02/2014, 06:20

... purchased from Sigma. Restriction enzymes and Taq DNA polymerase were from Invitrogen. Amicon centrifugal filter units were from Millipore while DEAE-Sephacel and Sephacryl S-200 HR was purchased from ... return of hydride from NADH to the opposite face of the keto sugar results in epimerization of the substrate and regeneration of NAD + [1]. Epimerase has been purified and characteri...

Ngày tải lên: 19/02/2014, 12:20