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Displaying 1051 - 1075 of 1263

Calculating sequence-dependent melting stability of duplex DNA oligomers and multiplex sequence analysis by graphs

September 1, 2001

Author(s)

A. S. Benight, P. Pancoska, R. Owczarzy, Peter M. Vallone, J. Nesetril, P. V. Riccelli

Effect of Single Mutations on the Specificity of Esherichia Coli FPG Protein for Excision of Purine Lesions From DNA Damaged By Free Radicals

September 1, 2001

Author(s)

O. Sidorkina, M. Dizdaroglu, J. Laval

The Formamidopyrimidine N-DNA glycosylase (Fpg protein) of Escherichia coli is a DNA repair enzyme that is specific for the removal of purine-derived lesions from DNA damaged by free radicals and other oxidative processes. We investigated the effect of

Neutral Polymers in the Nanopores of Alamethicin and Alpha-Hemolysin

September 1, 2001

Author(s)

S. M. Bezrukov, J. J. Kasianowicz

The Crystal Structure of Chorismate Lyase Shows a New Fold and a Tightly Retained Product

August 15, 2001

Author(s)

David T. Gallagher, M P. Mayhew, Marcia J. Holden, A J. Howard, K J. Kim, V L. Vilker

The enzyme chorismate lyase (CL) catalyzes the removal of pyruvate from chorismate to produce 4-hydroxy benzoate (4HB) for the ubiquinone pathway. In Escherichia coli, CL is monomeric with 164 residues; we have determined the structure of the CL product

Electrochemical Properties of Nanocrystalline Cadmium Stannate Films

August 1, 2001

Author(s)

Gintaras Valincius, Vytautas Reipa, V L. Vilker, John T. Woodward IV, Mark D. Vaudin

Measurement of 8-Hydroxy-2'-Deoxyadenosine In DNA by Liquid Chromatography/Mass Spectrometry

August 1, 2001

Author(s)

Pawel Jaruga, H Rodriguez, M Miral Dizdar

8-Hydroxyadenine (8-OH-Ade) is one of the major lesions, which is formed in DNA by hydroxyl radical attack on the C-8 position of adenine followed by oxidation. We describe the measurement of the nucleoside form of this compound, 8-hydroxy-2'

Raman and FTIR Spectroscopies of Fluorescein in Solutions

August 1, 2001

Author(s)

Lili Wang, A. E. Roitberg, Curtis W. Meuse, Adolfas K. Gaigalas

Raman and FTIR transform-infra red (FT-IR) spectroscopies of fluorescein in aqueous solutions have been investigated in the pH range from 9.1 to 5.4. At pH 9.1 fluorescein is in the dianion form. At pH 5.4, fluorescein is a mixture of monoanion (

Structure of the First-Shell Active Site in Metallolactamase: Effect of Water Ligands

August 1, 2001

Author(s)

Morris Krauss, H S. Gilson, N. Gresh

Metallolactamase active site structures are examined theoretically for clues to the differences in the enzyme active site observed in different organisms. We will show that the inherent behavior of this type of active site yields a relatively flat

Active Site Structure and Mechanism of Human Glyoxalase I - An Ab Initio Theoretical Study

July 25, 2001

Author(s)

U Richter, Morris Krauss

The structure of the active site of human glyoxalase I and the reaction mechanism of the enzyme-catalyzed conversion of the thiohemiacetal, formed from methylglyoxal and glutathione, to S-D-lactoylglutathione has been investigated by ab initio quantum

An MD/QM Study of the Chorismate Mutase-Catalyzed Claisen Rearrangement Reaction

July 1, 2001

Author(s)

S. E. Worthington, A. E. Roitberg, Morris Krauss

The reaction path for the rearrangement of chorismate to prephenate, catalyzed by chorismate mutase, has been calculated with ab initio quantum chemistry. The calculation of a reaction path is initiated from two catalytically competent conformations of the

Detection of Viable Cryptosporidium Parvum Using DNA-Modified Liposomes in a Microfluidic Chip

July 1, 2001

Author(s)

M. B. Esch, Laurie E. Locascio, Michael J. Tarlov, R. A. Durst

This paper describes a microfluidic chip that enables the detection of viable Cryptosporidium parvum by detecting RNA amplified by nucleic-acid sequence-based amplification (NASBA). The mRNA serving as the template for NASBA is produced by viable C. parvum

The Biological Macromolecule Crystallization Database

July 1, 2001

Author(s)

G L. Gilliland, Michael Tung, Jane E. Ladner

The Claisen Rearrangement of an Unusual Substrate in Chorismate Mutase

July 1, 2001

Author(s)

S. E. Worthington, Morris Krauss

The calculated reaction path for an unusual substrate of chorismate mutase (Bacillus.subtilis) is found to be completely comparable to that of the native chorismate. In the unusual substrate, the cyclohexadienyl ring in chorismate is replaced by

Fabrication Techniques to Realize CMOS-Compatible Microfluidic Microchannels

June 1, 2001

Author(s)

A. Rasmussen, Michael Gaitan, Laurie E. Locascio, Mona E. Zaghloul

Imaging of Electro-Osmotic Flow in Plastic Microchannels

June 1, 2001

Author(s)

David J. Ross, T J. Johnson, Laurie E. Locascio

Integrated Microfluidic System Enabling Protein Digestion, Peptide Separation, and Protein Identification

June 1, 2001

Author(s)

J Gao, J. Xu, Laurie E. Locascio, C S. Lee

The Application of Capillary Electrophoresis in the Analysis of PCR Products Used in Genetic Typing

May 15, 2001

Author(s)

B. R. McCord, John M. Butler

Measurement and Application of 1 H- 19 F Dipolar Couplings in the Structure Determination of 2'-Fluorolabeled RNA

May 1, 2001

Author(s)

B. Luy, John Marino

Residual dipolar couplings can provide powerful restraints for determination and refinement of the solution structure of macromolecules. The application of these couplings in nucleic acid structure elucidation can have an especially dramatic impact since

Proceedings of the Workshop on Measurement Traceability for Clinical Laboratory Testing and In Vitro Diagnostic Test Systems

May 1, 2001

Author(s)

Ellyn S. Beary

In November 2000, NIST hosted a workshop on Measurement Traceability for Clinical Laboratory Testing and In Vitro Diagnostic Devices. One of the driving forces was the new European Community (EC) In Vitro Diagnostic Devices (IVDD) directive that requires

Reliability Theory for Receptor-Ligand Bond Dissociation

May 1, 2001

Author(s)

D.F. J. Tees, John T. Woodward IV, D. A. Hammer

Nonempirical Analysis of the Nature of Catalytic Effects in Ribonuclease A Active Site

April 30, 2001

Author(s)

P Kedzierski, W A. Sokalski, Morris Krauss

The physical nature of the catalytic activity exerted by various ribonuclease A active site constituents is analyzed in terms of the differential transition state stabilization approach in which activation barrier changes induced by the molecular

The Structure of the T127L/S128A Mutant of cAMP Receptor Protein Facilitates Promoter Site Binding

April 6, 2001

Author(s)

S. Chu, M. Tordova, G L. Gilliland, I Gorshkova, Y. Shi, S. Wang, Frederick P. Schwarz

The x-ray crystal structure of the cAMP-ligated T127L/S128A double mutant of cAMP receptor protein (CRP) was determined to a resolution of 2.2 . Although this structure is close to that of the x-ray crystal structure of cAMP-ligated CRP with one subunit in

A Rare-Earth-Oxide Glass for the Wavelength Calibration of Near-Infrared Dispersive and Fourier-Transform Spectrometers

April 1, 2001

Author(s)

Steven J. Choquette, John C. Travis, L. E. O'Neal, C. J. Zhu, David L. Duewer

BioEqCalc: A Package for Performing Equilibrium Calculations on Biochemical Reactions

April 1, 2001

Author(s)

D Akers, Robert N. Goldberg

A Mathematica package BioEqCalc.m has been developed for treating complex equilibria in aqueous solutions. The package is geared towards the treatment of biochemical systems and as such yields information on the molalities and mole fractions of the species

Identification and Quantification of 8,5'-Cyclo-2'-Deoxyadenosine in DNA by Liquid Chromatography/Mass Spectrometry

April 1, 2001

Author(s)

M. Dizdaroglu, Pawel Jaruga, H Rodriguez

Recent studies suggested that 8,5'-cyclo-2'-deoxyadenosine may play a role in diseases with defective nucleotide-excision repair. This compound is one of the major lesions formed in DNA by hydroxyl radical attack on sugar moiety of 2'-deoxyadenosine. It is

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