Physical Sciences and Mathematics Commons^™

Non-Steady-State Approach #11;To Steady-State Kinetics: #11;Case Study Of H2s Oxidation By Oxygen, Andrey N. Zagoruiko, Vladimir V. Mokrinskii

Andrey N Zagoruiko

Non-steady-state kinetic models may be used for treatment of steady-state kinetic data in case when algebraic elaboration of steady-state kinetic equations is impossible or complicated. The proposed approach includes numerical integration of time-dependent differential equations until achievement of steady-state, resulting in possibility to numerically obtain the rate values for separate reaction stages for given composition of reaction mixture. The obtained non-steady-state model may be then applied in simulation of catalyst pellets and catalyst beds in research and engineering purposes. The case study demonstrates application of such approach for steady-state kinetic description of complicated reaction system of H2S oxidation by oxygen. …

Acid-Base Properties Of Aluminum In A Hardwood Forest Soil (Or: Acid Rain Is Dead…), Chris E. Johnson

Chris E Johnson

No abstract provided.

Rust, Glue, And Molecules -- Understanding The Role Of Molecular Structure On Macroscopic Interfacial Properties, Mark Anderson

Mark R. Anderson

No abstract is available at this time.

Hall And Wolynes Reply [Reply To Comment On ‘‘Microscopic Theory Of Network Glasses’’], Randall W. Hall, Peter G. Wolynes

Randall W. Hall

Heterostructures Of Polymer Photonic Crystal Films, Marc Egen, Rebecca Voss, Bernd Griesebock, Rudolf Zentel, Sergei Romanov, Clivia Sotomayor Torres

Rebecca Cademartiri

This paper describes ways to multilayer opaline films (opaline heterostructures) composed from functional opal layers of spheres with different lattice constants. At first various monodisperse colloidsboth cross-linked and un-cross-linkedwere prepared from methyl methacrylate, methyl α-chloroacrylate, and methyl α-bromoacrylate. These colloids can be crystallized into large, well-oriented opaline films with the help of a “drawing apparatus” by the method of crystallization in a moving meniscus. After annealing, a second opaline film can be crystallized on top of these films and so on. Electron microscopy inspection shows a sharp borderline between the sublayers and no disorder on both sides although the lattice …

Targeting The Transcriptional Machinery With Unique Artificial Transcriptional Activators, Brian Brennan, Zhiqian Wu, Garrette Belanger, Jenifer Lum, Aaron Minter, Steven Rowe, Annette Plachetka, Chinmay Majmudar, Anna Mapp

Brian B. Brennan

The link between a growing number of human diseases and misregulation of gene expression has spurred intense interest in artificial transcriptional activators that could be used to restore controlled expression of affected genes. To expand the repertoire of activation domains available for the construction of artificial transcriptional regulators, a selection strategy was used to identify two unique activation domain motifs. These activation domains bear little sequence homology to endogenous counterparts and bind to unique sites within the transcriptional machinery. A comparison with two well-characterized activation domains, VP2 and P201, demonstrated for the first time that functional potency is not solely …

High-Field 19.6 T 27Al Solid-State Mas Nmr Of In Vitro Aluminated Brain Tissue, Pamela L. Bryant, Walter J. Lukiw, Zhehong Gan, Randall W. Hall, Leslie G. Butler

Randall W. Hall

Reductivedesorption Of 11-Mercaptoundecanoic Acid Monolayers Modified By Covalent Attachment Of 1,3- And 1,4-Phenylenediamine, Mark Anderson, Richard Baltzersen

Mark R. Anderson

1,3- and 1,4-phenylenediamine were covalently attached to a self-assembled monolayer of 11-mercaptoundecanoic acid by formation of an amide bond. Bonding of the phenylenediamine isomers was confirmed by the presence of infrared features attributable to ring vibrational modes, the amide I vibration, and the amide II vibration in the reflection–absorption infrared spectrum of the modified interface. Reductivedesorption peak potentials were shifted by 120 mV for the monolayer modified by 1,4-phenylenediamine and by 90 mV for the monolayer modified by 1,3-phenylenediamine relative to the desorption potential of the unmodified 11-mercaptoundecanoic acid monolayer. These potential shifts represent 23 and 17 kJ/mol stabilization of …

Quelques Conseils À Nos Nouveau Diplomés, Fathi Habashi

Fathi Habashi

An advice, the old wise man Polonius offered to the young Hamlet was “Neither a borrower, nor a lender be”, may be no longer pertinent. Some more relevant advices are offered to new graduates of the twentieth century. Available in English, French, and Spanish

Three-Dimensional Quantitative Structure−Property Relationship (3d-Qspr) Models For Prediction Of Thermodynamic Properties Of Polychlorinated Biphenyls (Pcbs): Enthalpies Of Fusion And Their Application To Estimates Of Enthalpies Of Sublimation And Aqueous Solubilities, Swati Puri, James S. Chickos, William J. Welsh

James Chickos

No abstract provided.

Electrochemical Detection Of Oxidative Stress, Alice Harper, Mark Anderson

Mark R. Anderson

No abstract is currently available.

Studies Of Monolayer Films As Adhesion Promoters, Huimin Li, Mark Anderson

Mark R. Anderson

No abstract is currently available.

Capillary Electrophoresis To Determine Oxidative Stress, Stephanie Hooper, Mark Anderson

Mark R. Anderson

No abstract is currently available.

Raman Spectroscopy Of Rhombohedral P4o10, Sean J. Gilliam, Scott Kirkby, Clifton N. Merrow, Daniel Zeroka, Ajit Banerjee, James O. Jensen

Scott J. Kirkby

Heat Capacities Of Thiane Sulfones And Thiane Sulfoxide: Refining Of Cp Group Values For Organosulfur Compounds And Their Oxides, Marı́A Victoria Roux, Manuel Temprado, Pilar Jiménez, Ramón Guzmán-Mejı́A, Eusebio Juaristi, James S. Chickos

James Chickos

No abstract provided.

Enthalpies Of Vaporization Of Organic And Organometallic Compounds, 1880-2002, James S. Chickos, William E. Acree

James Chickos

No abstract provided.

The Microwave Spectrum, Ab Initio Analysis, And Structure Of The Fluorobenzene–Hydrogen Chloride Complex, M. Eugenia Sanz, Sonia Antolinez, Jose L. Alonso, Juan C. Lopez, Robert L. Kuczkowski, Sean A. Peebles, Rebecca A. Peebles, Faith C. Boman, Elfi Kraka, Dieter Cremer

Sean A. Peebles

The fluorobenzene–hydrogen chloride π-hydrogen-bonded complex has been studied by high resolution microwave spectroscopy and ab initio calculations. Rotational spectra of the C6H5F–H35Cl, C6H5F–H37Cl, and C6D5F–H35Cl isotopomers were assigned using pulsed molecular beam techniques in a Fourier-transform microwave spectrometer. The spectra are consistent with a structure of the complex in which the HCl is above the fluorobenzene ring near the ring center, similar to the benzene–HCl prototype dimer. An analysis of the inertial data and the chlorine quadrupole coupling tensor results in two mathematically possible locations for the HCl subunit with respect to the fluorobenzene arising from sign ambiguities in interpreting …

Spalanie Odpadów Chloroorganicznych Z Produkcji Chlorku Winylu Jako Źródło Emisji Zanieczyszczeń Powietrza, Robert Oleniacz

Robert Oleniacz

Production of vinyl chloride is a source of formation of significant gaseous, liquid and solid streams of chlorinated organic wastes containing up to 90 % of chlorine. One of the methods of chlorine recovery from the wastes is incineration. During the waste incineration chlorine released into the flue gases mainly in the form of hydrogen chloride (HCl). The article presents, among others, results of continuous and periodic measurement of concentrations of air pollutants in combustion gases emitted from one of the industrial installations for high-temperature incineration of chlorinated wastes, equipped with effective flue-gas treatment system and recovery of HCl. Data …

From Alchemy To Atomic Bombs. Book Review By George Kauffman, Fathi Habashi

Fathi Habashi

Review of the book "From Alchemy to Atomic Bombs" by Fathi Habashi published by Métallurgie Extractive Québec. The review is written by Professor George Kauffman at California State University, Fresno.

Synthesis Of 3- Or 4-Phenyl-1,8-Naphthyridine Derivatives And Evaluation Of Antimycobacterial And Antimicrobial Activity, Philadelphia University

Philadelphia University, Jordan

No abstract provided.

Steady‐State Absorption Rate Models For Use In Relaxation Rate Studies With Continuous Laserexcited Photothermal Lens Spectrometry, Stephen E. Bialkowski

Stephen E. Bialkowski

This paper examines the solutions of kinetic rate equations for prediction of the photothermal lens signals under irradiance conditions that can lead to optical saturation or bleaching. The relaxation kinetics resulting from forcing excited state populations in multiple levels by high excitation irradiance continuous lasers is examined and irradiance-dependent photothermal lens signals are predicted. The analyses described in this paper are based on simple kinetic models for optical excitation and subsequent excited state relaxation. Dark-state relaxation is assumed to be extremely fast compared to limiting kinetics resulting in simplified excited state models. Kinetic models are derived for two, four and …

Macromolecules In The 21st Century: An International Symposium On Polymer Science And Technology On The Occasion Otto Vogl's 75th Birthday, Gerald S. Kirshenbaum, Helga Roder

Otto Vogl

No abstract provided.

Acrb Multidrug Efflux Pump Of Escherichia Coli: Composite Substrate-Binding Cavity Of Exceptional Flexibility Generates Its Extremely Wide Substrate Specificity, Edward Yu, Julio R. Aires, Hiroshi Nikaido

Edward Yu

Gram-negative bacteria have, in general, much higher intrinsic levels of resistance to various antibiotics, antiseptics, dyes, and detergents than do gram-positive bacteria. This is, in part, due to the effectiveness of the outer membrane as a barrier. The porin channels exclude large compounds (for example, vancomycin) and drastically slow down the influx of most antibiotics, which are usually much larger than common nutrients. Most antibiotics and chemotherapeutic agents that act on targets in the cytosol must cross the inner, cytoplasmic membrane, usually by spontaneous diffusion, and this necessitates their being at least moderately lipophilic. These compounds can in principle diffuse …

Infrared-Active Vibron Bands Associated With Substitutional Impurities In Solid Parahydrogen, Robert Hinde

Robert Hinde

We present a model for the line shapes of infrared-active Q₁(0) vibron bands observed in solid parahydrogen doped with low concentrations of spherical substitutional impurities. The line shapes are highly sensitive to the H₂ vibrational dependence of the dopant–H₂ interaction. When this vibrational dependence is strong, the dopant can trap the infrared-active vibron in its first solvation shell; in this case, the trapped vibron manifests itself in the absorption spectrum as a narrow feature to the red of the pure solid’s vibron band.

A Solvent-Free Claisen Condensation Reaction For The Organic Laboratory, John Esteb, Matthew Stockton

John Esteb

An experiment involving the Claisen condensation reaction for a first-year organic chemistry laboratory is presented. Claisen condensations are routinely covered in organic textbooks but owing to the long reaction times required to reach equilibrium in solution they are seldom explored in the undergraduate teaching laboratory. In this experiment, potassium tert-butoxide and ethyl phenylacetate are heated to 100 °C for 30 minutes under solvent-free conditions to produce 2,4-diphenyl acetoacetate in 80% yield. The solvent-free nature of this procedure greatly reduces the quantity of waste generated by students relative to typical carbonyl condensation experiments.

Note:Link is to the article in a …

A Solvent-Free Oxidation Of Alcohols In An Organic Laboratory, John Esteb, Michael Schelle, Anne Wilson

John Esteb

An oxidation experiment for a first-year organic chemistry class is presented. This oxidation utilizes a solid mixture of CuSO4•5H2O and KMnO4 prepared by mortar and pestle. The oxidations take place under solvent-free conditions and near quantitative yields are obtained for the reactions. Thin-layer chromatography is used to monitor the progress of the reaction. This experiment provides for the simple oxidation of a secondary alcohol to a ketone using a relatively nontoxic oxidizing agent under solvent-free conditions.

Note:Link is to the article in a subscription database available to users affiliated with Butler University. Appropriate login information will be required for …

Bismuth Compounds In Organic Synthesis. Synthesis Of Resorcinarenes Using Bismuth Triflate, Ram S. Mohan, Katherine E. Peterson, Russell C. Smith

Ram S. Mohan

Bismuth Compounds In Organic Synthesis. Deprotection Of Ketoximes Using Bismuth Bromide-Bismuth Triflate, Ram S. Mohan, Joshua N. Arnold, Patrick D. Hayes, Robert L. Kohaus

Ram S. Mohan

Reactions Of Boranes And Metallaboranes With Phosphines, Lawrence Barton, Oleg Volkov, Mitsuhiro Hata, Paul Mcquade, Nigam P. Rath

Nigam Rath