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Full-Text Articles in Physical Sciences and Mathematics

5. Burton Carl Anderson, Otto Vogl Dec 2000

5. Burton Carl Anderson, Otto Vogl

Otto Vogl

No abstract provided.


6. Ichitaro Uematsu, Otto Vogl, Teiji Tsuruta, Yoshiko Uematsu Nov 2000

6. Ichitaro Uematsu, Otto Vogl, Teiji Tsuruta, Yoshiko Uematsu

Otto Vogl

No abstract provided.


Relationship Of Molecular Structure To The Mechanism Of Lysophospholipid-Induced Smooth Muscle Cell Proliferation, Yuh-Cherng Chai, David Binion, Guy Chisholm Sep 2000

Relationship Of Molecular Structure To The Mechanism Of Lysophospholipid-Induced Smooth Muscle Cell Proliferation, Yuh-Cherng Chai, David Binion, Guy Chisholm

Yuh-Cherng Chai

No abstract provided.


8. Paolo Corradini, Otto Vogl, Brigitta Griesbeck Corradini Sep 2000

8. Paolo Corradini, Otto Vogl, Brigitta Griesbeck Corradini

Otto Vogl

No abstract provided.


9. Oskar Friedrich Olaj, Otto Vogl Aug 2000

9. Oskar Friedrich Olaj, Otto Vogl

Otto Vogl

No abstract provided.


10. Dietrich Braun, Otto Vogl Jul 2000

10. Dietrich Braun, Otto Vogl

Otto Vogl

No abstract provided.


11. Binglin He, Otto Vogl, Frank C. Ho (He Zhenchi) Jun 2000

11. Binglin He, Otto Vogl, Frank C. Ho (He Zhenchi)

Otto Vogl

No abstract provided.


Effect Of Carbopol And Polyvinylpyrrolidone On The Mechanical, Rheological, And Release Properties Of Bioadhesive Polyethylene Glycol Gels, Philadelphia University May 2000

Effect Of Carbopol And Polyvinylpyrrolidone On The Mechanical, Rheological, And Release Properties Of Bioadhesive Polyethylene Glycol Gels, Philadelphia University

Philadelphia University, Jordan

No abstract provided.


The Role Of Monolayer Structure On Interfacial Phenomena, Mark Anderson Apr 2000

The Role Of Monolayer Structure On Interfacial Phenomena, Mark Anderson

Mark R. Anderson

No abstract is available at this time.


One-Dimensional Chains In Sodium Tetraphenylphosphonium Bis(2-Mercapto-4-Methylphenolato-O,S)Oxo-Vanadate(Iv), Paul Challen, D. Mcconville, W. Youngs Feb 2000

One-Dimensional Chains In Sodium Tetraphenylphosphonium Bis(2-Mercapto-4-Methylphenolato-O,S)Oxo-Vanadate(Iv), Paul Challen, D. Mcconville, W. Youngs

Paul R. Challen

No abstract provided.


The Vaporization Enthalpies Of Some Crown And Polyethers By Correlation Gas Chromatography, Gary Nichols, Jennifer Orf, Sarah M. Reiter, James Chickos, George W. Gokel Feb 2000

The Vaporization Enthalpies Of Some Crown And Polyethers By Correlation Gas Chromatography, Gary Nichols, Jennifer Orf, Sarah M. Reiter, James Chickos, George W. Gokel

James Chickos

No abstract provided.


Characterizing The Structure Of Polyimide Model Compounds At Metallic Interfaces, Mark Anderson Jan 2000

Characterizing The Structure Of Polyimide Model Compounds At Metallic Interfaces, Mark Anderson

Mark R. Anderson

No abstract is available at this time.


(N2o)2⋅So2: Rotational Spectrum And Structure Of The First Van Der Waals Trimer Containing Sulfur Dioxide, Rebecca A. Peebles, Robert L. Kuczkowski Jan 2000

(N2o)2⋅So2: Rotational Spectrum And Structure Of The First Van Der Waals Trimer Containing Sulfur Dioxide, Rebecca A. Peebles, Robert L. Kuczkowski

Rebecca A. Peebles

No abstract provided.


The Influence Of The Isomerization Reactions On The Soybean Oil Hydrogenation Process, Zeljko D. Cupic Jan 2000

The Influence Of The Isomerization Reactions On The Soybean Oil Hydrogenation Process, Zeljko D. Cupic

Zeljko D Cupic

No abstract provided.


Unified Matrix Processor Design For Fct-Iv And Fst-Iv Hartley Based Transforms, Philadelphia University Jan 2000

Unified Matrix Processor Design For Fct-Iv And Fst-Iv Hartley Based Transforms, Philadelphia University

Philadelphia University, Jordan

No abstract provided.


Behavior Of Grain Boundary Resistivity In Metals Predicted By A Two-Dimensional Model, Rand Dannenberg, Alexander H. King Jan 2000

Behavior Of Grain Boundary Resistivity In Metals Predicted By A Two-Dimensional Model, Rand Dannenberg, Alexander H. King

Alexander H. King

The behavior of a model for the specific grain boundary resistivity in metallic bamboo conductor lines is developed and compared to other theoretical treatments, and to experiment. The grain boundary is modeled as an array of scatterers on a plane. The scatterers are called “vacancy-ion” complexes, in which the vacancy represents the boundary free volume, and the ion is an atom adjacent to the vacancy. Three cases are investigated, that of noninterfering scatterers, a continuum of interfering scatterers, and discrete interfering scatterers. The approximations used lead to a specific grain boundary resistivity ∼10−16 Ω m2 for aluminum, in agreement with …


Structural Change Of The Mn Cluster During The S2→S3 State Transition Of The Oxygen-Evolving Complex Of Photosystem Ii. Does It Reflect The Onset Of Water/Substrate Oxidation? Determination By Mn X-Ray Absorption Spectroscopy, Wenchuan Liang, Theo A. Toelofs, Roehl M. Cinco, Annette Rompel, Matthew J. Latimer, Edward Yu, Kenneth Sauer, Melvin P. Klein, Vittal K. Yachandra Jan 2000

Structural Change Of The Mn Cluster During The S2→S3 State Transition Of The Oxygen-Evolving Complex Of Photosystem Ii. Does It Reflect The Onset Of Water/Substrate Oxidation? Determination By Mn X-Ray Absorption Spectroscopy, Wenchuan Liang, Theo A. Toelofs, Roehl M. Cinco, Annette Rompel, Matthew J. Latimer, Edward Yu, Kenneth Sauer, Melvin P. Klein, Vittal K. Yachandra

Edward Yu

The oxygen-evolving complex of Photosystem II in plants and cyanobacteria catalyzes the oxidation of two water molecules to one molecule of dioxygen. A tetranuclear Mn complex is believed to cycle through five intermediate states (S0−S4) to couple the four-electron oxidation of water with the one-electron photochemistry occurring at the Photosystem II reaction center. We have used X-ray absorption spectroscopy to study the local structure of the Mn complex and have proposed a model for it, based on studies of the Mn K-edges and the extended X-ray absorption fine structure of the S1 and S2 states. The proposed model consists of …


Sixth Pacific Polymer Conference, Ppc-6 Guangzhou, China, Otto Vogl, Xu Mao Jan 2000

Sixth Pacific Polymer Conference, Ppc-6 Guangzhou, China, Otto Vogl, Xu Mao

Otto Vogl

No abstract provided.


Spin-Exchange Term In The Solvent Equation Of State Near The Critical Point For Electron Transfer Reactions, Juana Vivó Acrivos Jan 2000

Spin-Exchange Term In The Solvent Equation Of State Near The Critical Point For Electron Transfer Reactions, Juana Vivó Acrivos

Juana Vivó Acrivos

Phenomenological Equations of State (EOS) for fluids near their critical point have been obtained using literature compression factor data, Zc = Pc Vc/(n R Tc) = 0.40 to 0.10 in Table I (Pc, Vc/n, Tc are the pressure, volume per n mole, and the absolute temperature of the fluid at the critical point). The objective is to explain the deviations from the van der Waals value, Zc(vdW) = 3/8 (-70 % for molten Se and alkali metals up to 6 % for molten Pb, Hg, and In) by including in the commonly used phenomenological thermodynamic relations a term which explicitly …


Solid State Phase Transitions Characterized By Esr And Xas, Juana Vivó Acrivos Jan 2000

Solid State Phase Transitions Characterized By Esr And Xas, Juana Vivó Acrivos

Juana Vivó Acrivos

Measurements of the relaxation time,  of electron systems to a disturbance, by two different spectroscopic methods are examined in detail, with the purpose to establish how the presence of fluctuations near a solid state phase transition are made evident in insulators, conductors and superconductors. The absolute temperature and the relaxation time determine the thermodynamic stability of the electronic system near a phase transition by the Uncertainty Principle. At a given temperature T, Landau and Lifshitz obtain the stability from the lower limit of the uncertainty in entropy in units of the Boltzmann constant, S/kB << 1 when T  >> 3.82 K ps. Magnetic resonance …


Infrared Spectro-Electrochemistry, Mark Anderson, C. Douglas Taylor Dec 1999

Infrared Spectro-Electrochemistry, Mark Anderson, C. Douglas Taylor

Mark R. Anderson

The combination of infrared (IR) spectroscopy and electrochemistry in a single measurement has been an area of active research interest since the late 1960s. IR spectroelectrochemical experiments provide insight about interfacial electrochemical phenomena and/or oxidation–reduction reaction mechanisms that cannot be obtained using either technique individually. The power of the measurement is in the complementary nature of the spectroscopic and electrochemical information available when obtained simultaneously. The combination of measurements, however, requires compromise between the IR spectroscopy and the electrochemistry because of their different sampling requirements. The need for compromise illustrates the unique strengths and weaknesses of the combined spectroelectrochemical measurement. …


Making Connections Between Metallofullerenes And Fullerenes: Electrochemical Investigations, Mark Anderson, Harry Dorn, Steven Stevenson Dec 1999

Making Connections Between Metallofullerenes And Fullerenes: Electrochemical Investigations, Mark Anderson, Harry Dorn, Steven Stevenson

Mark R. Anderson

The square-wave voltammetry for a series of related fullerenes and metallofullerenes measured in pyridine solutions containing 0.10 M tetra-n-butylammonium perchlorate is reported. Several dimetallic metallofullerenes, M2@Cx (where M=Sc or Er, and x=82 or 84), are found to have similar voltammetric responses regardless of metal identity or carbon number. Assignment of formal charges to the fullerene cage suggests that these metallofullerenes are isoelectronic and have related molecular orbital structures. The voltammetry of the empty C82 and D2d-C84 cages are also alike, but are different from the square-wave voltammetry of the C60, C70, and D2-C84. The similarity of the voltammetry for C82 …


The Discovery-Oriented Approach To Organic Chemistry. 3. Boron-Trifluoride Catalyzed Rearrangement Of Cis- And Trans-Stilbene Oxides. An Exercise In 1H Nmr Spectroscopy For Sophomore Organic Laboratories, Ram S. Mohan, Erik A. Sgariglia, Regina Schopp, Kostas Gavardinas Dec 1999

The Discovery-Oriented Approach To Organic Chemistry. 3. Boron-Trifluoride Catalyzed Rearrangement Of Cis- And Trans-Stilbene Oxides. An Exercise In 1H Nmr Spectroscopy For Sophomore Organic Laboratories, Ram S. Mohan, Erik A. Sgariglia, Regina Schopp, Kostas Gavardinas

Ram S. Mohan

Epoxides, or oxiranes, are among the most versatile intermediates in organic synthesis. Yet very few examples of laboratory experiments involving reactions of epoxides are to be found in lab texts. We have developed a discovery-oriented laboratory experiment that involves the rearrangement of both cis- and trans-stilbene oxides with boron trifluoride etherate. The identity of the product can be easily determined by 1H NMR spectroscopy and, in case of the trans isomer, by preparation of the semicarbazone derivative as well. In spite of the simplicity of the experiment, the element of discovery ensures that student interest and enthusiasm are retained.


Isolation Of Curcumin From Tumeric, Ram S. Mohan, Andrew M. Anderson, Matthew S. Mitchell Dec 1999

Isolation Of Curcumin From Tumeric, Ram S. Mohan, Andrew M. Anderson, Matthew S. Mitchell

Ram S. Mohan

No abstract provided.


Bismuth(Iii) Oxide Perchlorate Promoted Rearrangement Of Epoxides To Aldehydes And Ketones, Ram S. Mohan, Andrew M. Anderson, Jesse M. Blazek, Parie Garg, Brian J. Payne Dec 1999

Bismuth(Iii) Oxide Perchlorate Promoted Rearrangement Of Epoxides To Aldehydes And Ketones, Ram S. Mohan, Andrew M. Anderson, Jesse M. Blazek, Parie Garg, Brian J. Payne

Ram S. Mohan

Aryl-substituted epoxides and aliphatic epoxides with a tertiary epoxide carbon undergo smooth rearrangement in the presence of 10–50 mol% bismuth(III) oxide perchlorate, BiOClO4•xH2O, to give carbonyl compounds. The rearrangement is regioselective with aryl substituted epoxides and a single carbonyl compound arising from cleavage of benzylic C―O bond is formed. BiOClO4•xH2O is relatively non-toxic, insensitive to air and inexpensive, making this catalyst an attractive alternative to more corrosive and toxic Lewis acids such as BF3•Et2O or InCl3 currently used to effect epoxide rearrangements.