Báo cáo khoa học: "Less is more: Eliminating index terms from subordinate clauses" pdf

... with eliminating terms from a conventional statistical engine, combining this technique with the standard method of eliminating high frequency index terms Rather than eliminating terms from ... document index with a second index that contains linguistically- informed terms. Two types of terms are stored in this linguistic index: 1. LF triples. These are subgraphs extracted from the ... where P is precision, R is fl2p + R recall and [3 is the relative weight assigned to precision and recall (for these experiments, 13= 1). As Table 1 shows, by eliminating terms from all subordinate...

Tài liệu Báo cáo khoa học: "Extraction and Approximation of Numerical Attributes from the Web" pdf

... width is 2.195m,minimal is 88cm.• Average: Estimated avg. car width is 1.7m.• Direct/indirect comparisons: Toyota Corolla is wider than Toyota Corona.• Distribution: Car width is distributed ... can add terms appearing inthe question and having a strong PMI with the ob-ject (this can be estimated using any ﬁxed corpus).However, this is not essential.We then extract new terms from the ... tall is Michelle Obama? (180cm); How tall is the tallest penguin? (122cm); What is the heightof a tennis net? (92cm); What is the depth of theNile river? (1000cm = 10 meters); How heavy is a...

Báo cáo khoa học: "Accurate Learning for Chinese Function Tags from Minimal Features" pdf

... char-acteristics. Second one is likely that the long-distance dependency and sparseness problem de-grade the performance of adverbials greatly. Thiscan be viewed from the statistics in Table ... which is the percentage of chunks in the data that arefound by the tagger; and F-score which is equal to2×precision×recall/(precision+recall). Un-der the “IOB” tagging scheme, a function chunk is ... Tianjin and Taiwan is similar)”, “ (Tianjin and Taiwan)” is labeled with“TPC”, while “   (The industrial struc-ture)” with “SBJ”. In such settings, it is difﬁcult todistinguish between...

Báo cáo khoa học: "Power-Law Distributions for Paraphrases Extracted from Bilingual Corpora" pdf

... its Ap-plications, Issue 2, pp. 224–242.Chris Callison-Burch. 2008. Syntactic Constraintson Paraphrases Extracted from Parallel Corpora.Proc. EMNLP, pp. 196–205.Chris Callison-Burch, Cameron ... s) is greaterthan some threshold σ (see Section 4.1). If twophrases that satisfy condition (b) and have trans-lations in more than one common target cluster,a distinct such edge is established. ... s is more likely to visita stronger (more reliable) neighbor. If Ts,s={T |s and scoexist in subgraph generated by T },then the weight w(s → s) of the directed edge from s to sis...

Tài liệu Báo cáo khoa học: NirF is a periplasmic protein that binds d1 heme as part of its essential role in d1 heme biogenesis pdf

... cd1(His200) is conserved inNirF (His41); this conservation applies to all otherNirF sequences known in the database (Fig. S2). How-ever, the other catalytic site histidines (His 345 andHis388) ... notshown). His200 of P. pantotrophus NirS is conservedbetween NirF and NirS; it is the His residue that inNirS is the proximal axial ligand to the d1heme.Replacement of an equivalent His, His41, ... of adistinctive visible absorption spectrum (Fig. 6). The d1heme peak shifted from 681 to 630 nm. Consideringthat NirF is colourless and has no absorbance in theUV–visible region, this shift...

Tài liệu Báo cáo khoa học: Bacitracin is not a speciﬁc inhibitor of protein disulﬁde isomerase pptx

... not inhibit the catalysis ofdisulfide bond formation and isomerization by PDIPDI is a catalyst of thiol–disulfide exchange reactions,including oxidation, reduction and isomerization [1].The ... Morrison TG (2007)Thiol ⁄ disulfide exchange is required for membranefusion directed by the newcastle disease virus fusionprotein. J Virol 81, 2328–2339.13 Orlandi PA (1997) Protein-disulfide isomerase-mediatedreduction ... PDI is scarce, and the mechanism of inhibition is unknown. Here, we presentin vitro data showing that 1 mm bacitracin has no significant effect on theability of PDI to introduce or isomerize disulfide...

Tài liệu Báo cáo khoa học: Octaketide-producing type III polyketide synthase from Hypericum perforatum is expressed in dark glands accumulating hypericins pdf

... thus theirexpression in H. perforatum tissues could not be distin-guished from each other, the general name HpPKS2 is used in this study.Phylogenetic analysisThe overall similarity of the deduced ... thenodular structures is considered to have evolved as amechanism for the plant to avoid the potential auto-toxicity of these compounds [19].The biosynthesis of hypericins is currently poorlyunderstood, ... hyp-ericins in H. perforatum tissues and HpPKS2 is thus acandidate gene for the biosynthesis of hypericins [25].In this study, the role of H. perforatum HpPKS2 is investigated in more detail. We describe...

Tài liệu Báo cáo khoa học: It is all about resolution Meeting report based upon presentations at the 10th International Global BioMillennium 2006 symposium on molecular cell biology (Tbilisi, Georgia) docx

... protein function. A particular aspect that is special to theBioMillenium series of conferences (this has been the 10th in this series) is the emphasis on new and emerging technologies; the various ... cellmasses. Pericellular proteolysis is hence a prerequisitefor expansive tumor growth, collective invasion andlarge-scale tissue reshaping. In contrast, single-cell dis-semination associated with ... true extracellulartissue can be achieved by embedding the cells in hydra-ted gels of type 1 collagen, or in undisturbed tissues ofliving animals.Itamar Simon (Jerusalem, Isreal) described a...

Báo cáo khoa học: Visfatin is induced by peroxisome proliferator-activated receptor gamma in human macrophages pdf

... B-celldifferentiation [1], visfatin, is nicotinamide phosphori-bosyl transferase (NAMPT) [2,3], a rate-limitingenzyme in the synthesis of NAD+ from nicotin-amide. Visfatin ⁄ PBEF ⁄ NAMPT is synthesized ... circulating levels of visfatin havebeen observed in many inﬂammatory diseases suchas rheumatoid arthritis, obesity, insulin resistanceand type 2 diabetes [5–7]. Visfatin is secreted byneutrophils ... anincreased number of macrophages (adipose tissue macrophages) in adiposetissue. Within the adipose tissue, adipose tissue macrophages are the majorsource of visfatin ⁄ pre-B-cell colony-enhancing...

Báo cáo khoa học: YidC is required for the assembly of the MscL homopentameric pore potx

... 4-acetamido-4¢-maleim-idylstilbene-2,2¢-disulfonic acid disodium salt (AMS) werepurchased from Invitrogen (Carlsbad, CA, USA). Antise-rum against inﬂuenza haemagglutinin (HA) was obtained from Sigma (St Louis, MO). The other antisera ... lipidbilayer independently of the Sec machinery. This is consistent with pub-lished data. Surprisingly, and in conﬂict with earlier data, YidC is not criti-cal for membrane insertion of MscL. ... Based on the structure of the Mycobacteriumtuberculosis MscL homologue, this position is expectedto be exposed and relatively distant from the mem-brane, and should therefore be accessible...

Xem thêm