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Chemistry

Analytical chemistry

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Displaying 1351 - 1375 of 2086

Consideration and Influence of Complexed forms of Mercury Species on the reactivity Patterns Determined by Speciated Isotope Dilution Model Approaches: A Case for Natural Biological Reference Materials

June 1, 2008
Author(s)
David Point, J. I. Garcia Alonso, William C. Davis, Steven J. Christopher, Aurore Guichard, O.F. X. Donard, Paul R. Becker, Gregory C. Turk, Stephen A. Wise
The origins and the processes driving the inadvertent transformations of inorganic mercury (iHg) and methylmercury (MeHg) in cryogenically stored and homogenized fresh-frozen versus freeze-dried biological Standard Reference Materials (SRM) were

Broadband, frequency comb spectroscopy

May 4, 2008
Author(s)
Ian R. Coddington, William C. Swann, Nathan R. Newbury
A stabilized frequency comb provides a broadband array of highly resolved comb lines. Using a multiheterodyne technique, we measure the amplitude and phase of every comb line, allowing for massively parallel, high-resolution spectroscopy.

Shear Thinning Near the Critical Point of Xenon

April 17, 2008
Author(s)
Robert F. Berg, Michael R. Moldover, M Yao, G A. Zimmerli
We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < γτ < 700, where γτ is the shear rate scaled by the relaxation time τ of

A Thermodynamic Study of Ketoreductase-Catalyzed Reactions, Part 5. Reduction of Substituted Ketones in n-Hexane

April 1, 2008
Author(s)
Yadu D. Tewari, David J. Vanderah, Michele M. Schantz, Robert N. Goldberg, J D. Rozzell, J F. Liebman, Raymond W. Hui, Yitzy Nissenbaum, Ahmad R. Parniani
The equilibrium constants K for the ketoreductase-catalyzed reduction reactions of 1-benzyl-3-pyrrolidinone, ethyl 2-oxo-4-phenylbutyrate, ethyl 4-chloroacetoacetate, 1-benzyl-4-piperidone, and 1-benzyl-3-piperidone were measured in n-hexane at T = 298.15

Advancement of Light-Element Neutron Depth Profiling at the University of Texas

April 1, 2008
Author(s)
S M. Whitney, Robert Gregory Downing, S Biegalski, D S. O'Kelly
The University of Texas (UT) at Austin has collaborated with the National Institute of Standards and Technology for comparisons of concentration versus depth profiles of samples containing 10B. Technology sharing from NIST has allowed UT to avoid many

Commutability of NIST SRM 1955 Homocysteine and Folate in Frozen Human Serum With Selected Total Homocysteine Immunometric or Enzymatic Assays

March 1, 2008
Author(s)
B C. Nelson, Christine M. Pfeiffer, Ming Zhang, David L. Duewer, Katherine E. Sharpless, Katrice Lippa
Background: The National Institute of Standards and Technology (NIST) and the Centers for Disease Control and Prevention (CDC) have recently developed Standard Reference Material (SRM) 1955 Homocysteine and Folate in Frozen Human Serum with certified

Self-Assembled Monolayers of an Oligo(ethylene oxide) Disulfide and its Corresponding Thiol Assembled From Water: Characterization and Protein Resistance

February 5, 2008
Author(s)
David J. Vanderah, Marlon L. Walker, Mark A. Rocco, Kenneth A. Rubinson
The self-assembled monolayers (SAMs) of the ?-methyl oligo(ethylene oxide) disulfide [S(CH2CH2O)6CH3]2, [S(EO)6]2 {OEO disulfide}, on Au from 95 % ethanol and from water are described. Spectroscopic ellipsometry and reflection-absorption infrared

Gain-assisted superluminal optical solitons at very low light intensity

January 30, 2008
Author(s)
Lu Deng, Guoxiang Huang, C Hang
We show the possibility of generating gain-assisted superluminal optical solitons in a room- temperature three-state active Raman gain medium. We demonstrate both analytically and numerically that under appropriate conditions a signal field of very low

Raman Spectroscopic Determination of Hole Concentration in p-Type GaSb

January 2, 2008
Author(s)
James E. Maslar, Wilbur S. Hurst, C Wang
Room temperature p-type GaSb bulk coupled mode spectra were measured as a function hole concentration. These spectra were obtained using an optical system based on 752.55 nm excitation in order to obtain more sensitivity to bulk GaSb coupled mode

Characterization of 3-Color CARS in a 2-Pulse Broadband CARS Spectrum

November 15, 2007
Author(s)
Young Jong Lee, Marcus T. Cicerone, Yuexin Liu
We present a new and simple approach to broadband coherent anti-Stokes Raman scattering (CARS) microscopy that yields background-free vibrational spectra. We present evidence for a mechanism where two different frequency components in a continuum pulse

Monitoring Contaminants in Seabirds: The Importance of Specimen Banking

November 13, 2007
Author(s)
Stacy S. Vander-Pol, Paul R. Becker
Historically, contaminants in seabird tissues were monitored by considering physically visible effects; however, subtle, sub-lethal effects are also important. Several long-term monitoring and specimen banking programs are in place for seabirds, and the

Raman Spectroscopy of n-Type and p-Type GaSb with Multiple Excitation Wavelengths

October 1, 2007
Author(s)
James E. Maslar, Wilbur S. Hurst, C Wang
The interpretation of Raman spectra of GaSb can be complicated by the presence of a so-called surface space-charge region (SSCR), resulting in an inhomogeneous near-surface Raman scattering environment. To fully interpret Raman spectra, it is important to

Simultaneous Determination of Inorganic Mercury, Methylmercury, and Total Mercury Concentrations in Cryogenic Fresh-Frozen and Freeze-dried Biological Reference Materials

October 1, 2007
Author(s)
David Point, William C. Davis, J. I. Garcia Alonso, Mathilde Monperrus, Steven J. Christopher, O.F. X. Donard, Paul R. Becker, Stephen A. Wise
A double spike speciated isotope dilution (DS-SID) reaction model was developed to study and correct for the inadvertent transformations affecting methylmercury (MeHg), inorganic mercury (iHg) and total mercury (HgT) measurements in biological tissues

Characterization of a Suite of Ginkgo-Containing Standard Reference Materials

September 1, 2007
Author(s)
Catherine A. Rimmer, S. Howerton, Katherine E. Sharpless, Lane C. Sander, Stephen E. Long, Karen E. Murphy, Barbara J. Porter, K. Putzbach, M. S. Rearick, Stephen A. Wise, Laura J. Wood, Rolf L. Zeisler, Diane K. Hancock, James H. Yen, J. M. Betz, A. NguyenPho, L. Yang, C. Scriver, S. N. Willie, R. Sturgeon, B. Schaneberg, C. Nelson, J. Skamarack, M. Pan, L. Kerri, D. Gray, E. H. Waysek, A. Blatter, E. Reich
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