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Displaying 1301 - 1325 of 4634

Quantification and Compensation of Unintentional Analyte Aggregation in Electrospray Sampling

March 30, 2011
Author(s)
Mingdong M. Li, Suvajyoti S. Guha, Rebecca A. Zangmeister, Michael J. Tarlov, Michael R. Zachariah
… gas phase for characterization by mass spectrometry and ion mobility. Recent studies in our group using electrospray ion mobility to characterize protein aggregation in solution … through ES- differential mobility experiments using gold nanoparticles. The results show that the extent of …

Dielectric loss extraction for superconducting microwave resonators

May 5, 2020
Author(s)
Corey Rae H. McRae, Russell Lake, Junling Long, Mustafa Bal, Xian Wu, Battogtokh Jugdersuren, Thomas Metcalf, Xiao Liu, David P. Pappas
The investigation of two-level-state (TLS) loss in dielectric materials and interfaces remains at the forefront of materials research in superconducting quantum circuits. We demonstrate a method of TLS loss extraction of a thin film dielectric by measuring

AC stark shifts of dark resonances probed with Ramsey spectroscopy

November 16, 2018
Author(s)
James Wesley Y. Pollock, V. I. Yudin, Moshe Shuker, M. Y. Basalaev, A. V. Taichenachev, Xiaochi Liu, John E. Kitching, Elizabeth A. Donley
The off-resonant AC Stark shift for coherent population trapping (CPT) resonances probed with Ramsey spectroscopy is investigated experimentally and theoretically. Measurements with laser- cooled 87Rb atoms show excellent quantitative agreement with a

Solution Structures of Bacillus Anthracis Protective Antigen Proteins using Small Angle Neutron Scattering and Protective Antigen 63 Ion Channel Formation Kinetics

December 11, 2021
Author(s)
Ariel Michelman-Ribeiro, Kenneth A. Rubinson, Vitalii Silin, John J. Kasianowicz
… are studying the structures of bacterial toxins that form ion channels and catalyze macromolecule transport across … alpha-hemolysin, anthrax, Bacillus anthracis, β-barrel, ion channel, pore forming toxin, PA63, PA83 … Small Angle Neutron Scattering and Protective Antigen 63 Ion Channel Formation Kinetics …

Electrospray Tandem Quadrupole Fragmentation of Quinolone Drugs and Related Ions. On the Reversibility of Water Loss from Protonated Molecules

November 30, 2010
Author(s)
Pedatsur Neta, Bhaskar Godugu, Yuxue Liang, Yamil Simon, Xiaoyu Yang, Stephen E. Stein
… The authors suggested formation of two singly protonated ions with different behavior, one undergoing loss of H 2 O … cone voltage as well. We further find that many fragment ions formed by loss of H 2 O can attach a water molecule in the collision cell, whereas ions formed by loss of CO 2 do not. Since re-attachment of H …

Electrical Characterization of Al/AlOx/Molecule/Ti/Al Devices?

March 11, 2005
Author(s)
Curt A. Richter, D R. Stewart, D A. Ohlberg, R. S. Williams
We report experimental electrical characterization of Al/AlOx/Molecule/Ti/Al planar crossbar devices incorporating Langmuir-Blodgett organic monolayers of eicosanoic acid, fast-blue or chlorophyll-B. Current-voltage and capacitance-voltage measurements on

Experimental purification of two-atom entanglement

October 19, 2006
Author(s)
Rainer Reichle, Dietrich G. Leibfried, Emanuel H. Knill, Joseph W. Britton, Brad R. Blakestad, John D. Jost, C. Langer, R Ozeri, Signe Seidelin, David J. Wineland
Entanglement is one of the most counterintuitive features of quantum mechanics. It is a necessary resource for quantum communication and quantum information processing. Entanglement established between different locations enables private communication and

Fundamental constants and tests of theory in Rydberg states of one-electron ions

March 19, 2010
Author(s)
Ulrich D. Jentschura, Peter Mohr, Joseph N. Tan
… of the theory of circular Rydberg states of hydrogenlike ions allows highly-accurate predictions to be made for energy … can be increased by utilizing a variety of combinations of ions and Ryberg states to determine fundamental constants and … and tests of theory in Rydberg states of one-electron ions …

Entropic modulation of divalent cation transport

September 22, 2025
Author(s)
Yechan Noh, Demian Riccardi, Alexander Smolyanitsky
… enthalpic contributions from transiently decreased ion-solvent and increased ion-pore electrostatic interactions. This commonly accepted … ion transport, thermodynamics, entropy, enthalpy, theory, …

Effect of Resin Composition on the Remineralizing Ability of Amorphous Calcium Phosphate-Based Polymeric Composites

May 15, 2000
Author(s)
Drago Skrtic, Joseph M. Antonucci, E D. Eanes
… as the Gibbs free energy, DGo. Elevated Ca2+ and PO4 ion concentrations were sustained in all BTHZ and UH resins. … potential due to the resin retention of released Ca2+ via ion binding by carboxylic acid groups of PMGDMA. … Hybridization of the fillers had no effect on the ion release from BTHZ composites. However, internal …

Characterization of Drug-Eluting Stent (DES) Materials With Cluster Secondary Ion Mass Spectrometry (SIMS)

July 1, 2006
Author(s)
Christine M. Mahoney, Martin McDermott
… Secondary Ion Mass Spectrometry (SIMS) employing an SF5+ polyatomic primary ion source was utilized to analyze several materials commonly … molecular signal as a function of increasing SF5+ primary ion dose when experiments were performed at cryogenic … Drug-Eluting Stent (DES) Materials With Cluster Secondary Ion Mass Spectrometry (SIMS) …

Cation Diffusion at the Polymer Coating/Metal Interface.

January 1, 1995
Author(s)
Tinh Nguyen, Z Zhang, C Lin, J M. Pommersheim
Theoretical and experimental studies were carried out on the transport of cations in the channel between a polymer coating and a metal substrate from a defect in the absence of an applied electrical potential. The model consists of two stages: an initial

Effect of Cluster Ion Analysis Fluence on Interface Quality in SIMS Molecular Depth Profiling

November 10, 2009
Author(s)
Christopher Szakal, Steven Hues, J Greg Gillen, Joe Bennett
… Cluster ion beams are being routinely utilized in secondary ion mass spectrometry (SIMS) for molecular depth profiling … as soft organic matrices, often require large analysis ion fluences in order to generate sufficient count rates for … Effect of Cluster Ion Analysis Fluence on Interface Quality in SIMS Molecular …
Displaying 1301 - 1325 of 4634
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