Search results for: Todd J. Green

Items from 1 to 11 out of 11 results

article

Chlamydia trachomatis glyceraldehyde 3‐phosphate dehydrogenase: Enzyme kinetics, high‐resolution crystal structure, and plasminogen binding

Norbert Schormann, Juan Campos, Rachael Motamed, Katherine L. Hayden, more

Glyceraldehyde 3‐phosphate dehydrogenase (GAPDH) is an evolutionarily conserved essential enzyme in the glycolytic pathway. GAPDH is also involved in a wide spectrum of non‐catalytic cellular ‘moonlighting’ functions. Bacterial surface‐associated GAPDHs engage in many host interactions that aid in colonization, pathogenesis, and virulence. We have structurally and functionally characterized the recombinant...

chapter

Processing XML Streams with Deterministic Automata

Todd J. Green, Gerome Miklau, Makoto Onizuka, Dan Suciu

Lecture Notes in Computer Science > Database Theory — ICDT 2003 > Query Evaluation > 173-189

We consider the problem of evaluating a large number of XPath expressions on an XML stream. Our main contribution consists in showing that Deterministic Finite Automata (DFA) can be used effectively for this problem: in our experiments we achieve a throughput of about 5.4MB/s, independent of the number of XPath expressions (up to 1,000,000 in our tests). The major problem we face is that of the size...

chapter

Models for Incomplete and Probabilistic Information

Todd J. Green, Val Tannen

Lecture Notes in Computer Science > Current Trends in Database Technology – EDBT 2006 > Inconsistency and Incompleteness in Databases (IIDB) > 278-296

We discuss, compare and relate some old and some new models for incomplete and probabilistic databases. We characterize the expressive power of c-tables over infinite domains and we introduce a new kind of result, algebraic completion, for studying less expressive models. By viewing probabilistic models as incompleteness models with additional probability information, we define completeness and closure...

article

1.55 Å resolution X‐ray crystal structure of Rv3902c from Mycobacterium tuberculosis

Bharat G. Reddy, Derek B. Moates, Heung‐Bok Kim, Todd J. Green, more

Acta Crystallographica Section F > 70 > 4 > 414 - 417

The crystallographic structure of the Mycobacterium tuberculosis (TB) protein Rv3902c (176 residues; molecular mass of 19.8 kDa) was determined at 1.55 Å resolution. The function of Rv3902c is unknown, although several TB genes involved in bacterial pathogenesis are expressed from the operon containing the Rv3902c gene. The unique structural fold of Rv3902c contains two domains, each consisting of...

chapter

Recomputing Materialized Instances after Changes to Mappings and Data

Todd J. Green, Zachary G. Ives

2012 IEEE 28th International Conference on Data Engineering > 330 - 341

2012 IEEE International Conference on Data Engineering (ICDE 2012)

A major challenge faced by today's information systems is that of evolution as data usage evolves or new data resources become available. Modern organizations sometimes exchange data with one another via declarative mappings among their databases, as in data exchange and collaborative data sharing systems. Such mappings are frequently revised and refined as new data becomes available, new cross-reference...

article

Reconcilable Differences

Todd J. Green, Zachary G. Ives, Val Tannen

Theory of Computing Systems > 2011 > 49 > 2 > 460-488

In this paper we study a problem motivated by the management of changes in databases. It turns out that several such change scenarios, e.g., the separately studied problems of view maintenance (propagation of data changes) and view adaptation (propagation of view definition changes) can be unified as instances of query reformulation using views provided that support for the relational difference operator...

article

Containment of Conjunctive Queries on Annotated Relations

Todd J. Green

Theory of Computing Systems > 2011 > 49 > 2 > 429-459

We study containment and equivalence of (unions of) conjunctive queries on relations annotated with elements of a commutative semiring. Such relations and the semantics of positive relational queries on them were introduced in a recent paper as a generalization of set semantics, bag semantics, incomplete databases, and databases annotated with various kinds of provenance information. We obtain positive...

article

Implementing mapping composition

Philip A. Bernstein, Todd J. Green, Sergey Melnik, Alan Nash

The VLDB Journal > 2008 > 17 > 2 > 333-353

Mapping composition is a fundamental operation in metadata driven applications. Given a mapping over schemas σ₁ and σ₂ and a mapping over schemas σ₂ and σ₃, the composition problem is to compute an equivalent mapping over σ₁ and σ₃. We describe a new composition algorithm that targets practical applications. It incorporates view unfolding. It eliminates as many σ₂ symbols as possible, even if not...

article

Conserved characteristics of the rhabdovirus nucleoprotein

Ming Luo, Todd J. Green, Xin Zhang, Jun Tsao, more

Virus Research > 2007 > 129 > 2 > 246-251

Rhabdovirus is a negative strand RNA virus that packages a ribonucleoprotein (RNP) complex. The RNP is composed of a genome that is encapsidated completely by the nucleoprotein (N). Structural comparisons of the RNA–nucleoprotein complexes from two members, vesicular stomatitis virus (VSV) and rabies virus (RABV), revealed highly conserved characteristics of folding, RNA binding, and assembly despite...

article

Visualizing the RNA Molecule in the Bacterially Expressed Vesicular Stomatitis Virus Nucleoprotein-RNA Complex

Zhiqiang Chen, Todd J. Green, Ming Luo, Huilin Li

Structure > 2004 > 12 > 2 > 227-235

Packaging of the RNA molecule in viruses is important for the preservation and expression of viral genomic information. The vesicular stomatitis virus (VSV) nucleoproteins are kept associated with its negative-strand RNA during the mRNA synthesis and replication, in contrast to the tobacco mosaic virus whose nucleoproteins are released from RNA. It has been a puzzle how the VSV RNA is packaged to...

article

Dimensionally stable closed cell rigid polyisocyanate based foam prepared from a froth foaming mixture

Todd J Green, John R Tucker

Journal of Fluorine Chemistry > 1997 > 82 > 1 > 116-117

There is now provided a closed cell rigid polyisocyanate based foam blowing with a C1-C4 hydrofluorocarbon and water as blowing agents, which possesses a uniform density gradient varying by not more than 10 percent. There is also now provided a froth foaming mixture having good flow by employing a hydroxy terminated polyol which is pH neutral and a tertiary amine ether blow catalyst in an amount...

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INFONA - science communication portal

Search results for: Todd J. Green

Chlamydia trachomatis glyceraldehyde 3‐phosphate dehydrogenase: Enzyme kinetics, high‐resolution crystal structure, and plasminogen binding

Processing XML Streams with Deterministic Automata

Models for Incomplete and Probabilistic Information

1.55 Å resolution X‐ray crystal structure of Rv3902c from Mycobacterium tuberculosis

Recomputing Materialized Instances after Changes to Mappings and Data

Reconcilable Differences

Containment of Conjunctive Queries on Annotated Relations

Implementing mapping composition

Conserved characteristics of the rhabdovirus nucleoprotein

Visualizing the RNA Molecule in the Bacterially Expressed Vesicular Stomatitis Virus Nucleoprotein-RNA Complex

Dimensionally stable closed cell rigid polyisocyanate based foam prepared from a froth foaming mixture

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