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Articles 901 - 930 of 939
Full-Text Articles in Chemistry
Developmental Dyslexia: Evidence For A Subgroup With A Reversal Of Cerebral Asymmetry, Daniel B. Hier, Marjorie Lemay, Peter B. Rosenberger, Vincent P. Perlo
Developmental Dyslexia: Evidence For A Subgroup With A Reversal Of Cerebral Asymmetry, Daniel B. Hier, Marjorie Lemay, Peter B. Rosenberger, Vincent P. Perlo
Chemistry Faculty Research & Creative Works
The Computerized Brain Tomograms of 24 Patients with Developmental Dyslexia Were Analyzed for Cerebral Asymmetry. Ten Patients Showed a Reversal of the Pattern of Asymmetry Regularly Observed in Normal Right-Handed Individuals So that the Right Parietooccipital Region Was Wider Than the Left. the Ten Dyslexic Patients with This Reversal of Cerebral Asymmetry Had a Lower Mean Verbal IQ Than the Other 14 Dyslexic Patients in This Study. the Reversal of Cerebral Asymmetry that Occurred in Ten of the Dyslexic Patients May Result in Language Lateralization to a Cerebral Hemisphere that is Structurally Less Suited to Support Language Function and Thus …
High Spin-Low Spin Crossover And Antiferromagnetic Interactions In Tris(1-Pyrrolidinecarbodithioato)Iron(Iii) And The 4-Morpholine (Fem) And Dibutyl Analogs, Effect Of Recrystallization Solvent, And Crystal Structure Of Fem·Nitrobenzene, Edward J. Cukauskas, Bascom Sine Deaver, Ekkehard Sinn
High Spin-Low Spin Crossover And Antiferromagnetic Interactions In Tris(1-Pyrrolidinecarbodithioato)Iron(Iii) And The 4-Morpholine (Fem) And Dibutyl Analogs, Effect Of Recrystallization Solvent, And Crystal Structure Of Fem·Nitrobenzene, Edward J. Cukauskas, Bascom Sine Deaver, Ekkehard Sinn
Chemistry Faculty Research & Creative Works
High sensitivity magnetic susceptibility determinations, especially in the range 1.2-4.2 K on pure and dilute tris(pyrrolidinecarbodithioato)iron(III) (FeP) in its high spin form, show that a maximum at about 2 K is caused by antiferromagnetic interactions. The analogous chromium(III) complex does not exhibit significant antiferromagnetism compared to that of the iron complex, and it is likely that the upper e electrons possessed by the iron and not by the chromium are responsible for the bulk of the antiferromagnetism. As the iron atoms are about 9 Å apart in discrete molecules, the antiferromagnetic interactions presumably occur between unpaired spins delocalized on to …
Metal-Ion Oxidative Decarboxylations. 10. Substituent Effects In The Cerium(Iv)-Benzilic Acids Reaction, Samir B. Hanna, Sezai A. Sarac
Metal-Ion Oxidative Decarboxylations. 10. Substituent Effects In The Cerium(Iv)-Benzilic Acids Reaction, Samir B. Hanna, Sezai A. Sarac
Chemistry Faculty Research & Creative Works
The rates of oxidation by cerium (IV) of several substituted benzylic acids (unsubstituted, 2,2′-dichloro, 4,4′-dichloro, 4,4′-dimethyl, 4,4′-dimethoxy, and 4,4′-dinitro) to the corresponding benzophenones have been studied spectrophotometrically in aqueous H2SO4, aqueous HClO4-HOAc, and acetonitrile. The rates are much slower in H2SO4 than in the other two media, probably because of heavy sulfato complexation of cerium(IV). The px as of the various acids were determined potentiometrically. The Hammett p values in acetonitrile and HClO4-HOAc media, derived from correlations with several sets of σ constants and with the newly determined pK …
Micellar Solutions Versus Microemulsions, Derek G. Rance, Stig Friberg
Micellar Solutions Versus Microemulsions, Derek G. Rance, Stig Friberg
Chemistry Faculty Research & Creative Works
No abstract provided.
Metal-Ion Oxidative Decarboxylations. 9. Reaction Of Benzilic Acid With Cerium(Iv) In Acidic Perchlorate And Sulfate Media, Samir B. Hanna, Sezai A. Sarac
Metal-Ion Oxidative Decarboxylations. 9. Reaction Of Benzilic Acid With Cerium(Iv) In Acidic Perchlorate And Sulfate Media, Samir B. Hanna, Sezai A. Sarac
Chemistry Faculty Research & Creative Works
The kinetics of oxidation of benzylic acid (HLH) to benzophenone by cerium (IV) has been studied in several media using the stopped-flow technique. In HClO4-Na2SO4-NaClO4 media, which allow for the variation and control of the concentrations of the various Ce(IV) species at constant [H+] and ionic strength, the rate data suggest CeSO42+ as the kinetically relevant species. In HClO4 the observed first-order rate constants, tetrad, first increase with increasing HLH concentration, then decrease slightly at higher substrate concentrations suggesting the intermediacy of two complexes: a reactive [Ce(IV)HL] and …
Erratum: The Internal Chemical Shift - A Key To Bonding In Aromatic Molecules. 2. Substituent Effects On Carbon-13 Magnetic Resonance Spectra Of The 1,4-Disubstituted Benzenes (Journal Of Physical Chemistry (1976) 80, (2024)), D. (Donald) W. Beistel, W. Dan Edwards
Erratum: The Internal Chemical Shift - A Key To Bonding In Aromatic Molecules. 2. Substituent Effects On Carbon-13 Magnetic Resonance Spectra Of The 1,4-Disubstituted Benzenes (Journal Of Physical Chemistry (1976) 80, (2024)), D. (Donald) W. Beistel, W. Dan Edwards
Chemistry Faculty Research & Creative Works
No abstract provided.
Proton Shift Additivity And Substituent Interaction Parameters, Donald W. Beistel, Gary Chappell, W. Daniel Edwards
Proton Shift Additivity And Substituent Interaction Parameters, Donald W. Beistel, Gary Chappell, W. Daniel Edwards
Chemistry Faculty Research & Creative Works
The 4-substituted acetophenone family is characterized and its shifts are correlated with those of nine families of 1, 4-disubstituted benzenes reported previously. Then a simple mathematical model is derived to account for the proton magnetic resonance shifts within families of 1, 4-disubstituted benzenes. The model suggests that the substituents interact by σ-bond polarization. The polarization model rationalizes shift additivity and is consistent with the qualitative relationship between the number of valence electrons on a substituent and its capacity to induce shifts. © 1977, American Chemical Society. All rights reserved.
Inelastic Cross Sections For Molecules Interacting Through Dipole And/Or Quadrupole Potentials, Louis Biolsi Jr.
Inelastic Cross Sections For Molecules Interacting Through Dipole And/Or Quadrupole Potentials, Louis Biolsi Jr.
Chemistry Faculty Research & Creative Works
Formal expressions for the lowest order inelastic contribution to the degeneracy averaged total cross section for both distinguishable and indistinguishable rigid diatomic molecules are obtained for molecules interacting through a multiple potential. Explicit expressions for the inleastic cross section are obtained for molecules interacting through permanent dipole-dipole, dipole-quadrupole, or quadrupole-quadrupole potentials. These results require the summation over only a single quantum number; the relative angular momentum quantum number. Thus, they are useful for analytic or numerical calculations.
Effect Of Angular Momentum On The Relaxation Time In A Multicomponent Gas Mixture, Louis Biolsi Jr.
Effect Of Angular Momentum On The Relaxation Time In A Multicomponent Gas Mixture, Louis Biolsi Jr.
Chemistry Faculty Research & Creative Works
The effects of molecular angular momentum (spin polarization) on the bulk viscosity and relaxation time in a multicomponent gas mixture are considered. Formal theoretical results are obtained, using the Wang Chang-Uhlenbeck approach to the kinetic theory of gases with internal states. The results are given in terms of integrals over the weighted quantum mechanical degeneracy averaged cross section.
Planning A Kinetic And Mechanistic Study With Cerium (Iv), Samir B. Hanna, Robert R. Kessler, André Merbach, Steve Ruzicka
Planning A Kinetic And Mechanistic Study With Cerium (Iv), Samir B. Hanna, Robert R. Kessler, André Merbach, Steve Ruzicka
Chemistry Faculty Research & Creative Works
No abstract provided.
The Internal Chemical Shift - A Key To Bonding In Aromatic Molecules. 2. Substituent Effects On The Carbon-13 Magnetic Resonance Spectra Of The 1,4-Disubstituted Benzenes, Donald W. Beistel, W. Dan Edwards
The Internal Chemical Shift - A Key To Bonding In Aromatic Molecules. 2. Substituent Effects On The Carbon-13 Magnetic Resonance Spectra Of The 1,4-Disubstituted Benzenes, Donald W. Beistel, W. Dan Edwards
Chemistry Faculty Research & Creative Works
Carbon-13 magnetic resonance shifts were determined for six families of 1,4-disubstituted benzenes. Linear least-squares correlations between the internal shifts of the families suggest an additivity relationship for 13C substituent effects at all four nonidentical ring carbons and at the α position when one of the substituents has a central carbon. The correlation of 1H and 13C shifts for these compounds is also linear, implying that the additivity relationships derived in a previous 1H study can be generalized to 13C.
The P-Nitrobenzyl System. Iv. Base-Induced Transformations In P-Nitrobenzyl Chloride, Bromide, Iodide, Tosylate, And Sulfonium Salts, Samir B. Hanna, Paul H. Ruehle
The P-Nitrobenzyl System. Iv. Base-Induced Transformations In P-Nitrobenzyl Chloride, Bromide, Iodide, Tosylate, And Sulfonium Salts, Samir B. Hanna, Paul H. Ruehle
Chemistry Faculty Research & Creative Works
No abstract provided.
Double Beta Decay Of ¹²⁸Te, Edward W. Hennecke, Oliver Manuel, Dwarka D. Sabu
Double Beta Decay Of ¹²⁸Te, Edward W. Hennecke, Oliver Manuel, Dwarka D. Sabu
Chemistry Faculty Research & Creative Works
The half-life of 128Te relative to the half-life of 130Te has been found to be t12128t12130=(1.59±0.05)×103 by measurement of the ββ-decay products, 128Xe and 130Xe, in a geologically old (2.4×109 yr) telluride ore. These results yield an upper limit on the lepton nonconservation parameter, η≤0.8×10-4. RADIOACTIVITY ββ-decay 128Te; measured T1/2=1.5×1024 yr; deduced η≤0.8×10-4. Detected excess 128Xe in old Te ore.
A Piagetian Approach To General Chemistry, Donald W. Beistel
A Piagetian Approach To General Chemistry, Donald W. Beistel
Chemistry Faculty Research & Creative Works
No abstract provided.
Locating The St. Louis Urban Plume At 80 And 120 Km And Some Of Its Characteristics, J. F. Stampfer, J. A. Anderson
Locating The St. Louis Urban Plume At 80 And 120 Km And Some Of Its Characteristics, J. F. Stampfer, J. A. Anderson
Chemistry Faculty Research & Creative Works
The feasibility of locating the urban plume of a moderately large urban area, as far as 120 km downwind, is shown. The method utilizes a single engine aircraft and aerosol instrumentation. A summary of the data obtained from 34 flights, during an 8-month period, is presented and the problems involved in interpreting the data are discussed. These difficulties include nonuniform background levels outside the plume, changing relative humidity, low wind speeds and stable atmospheric layers. The plume was characterized by concentrations of small particles (0.15 < r < 0.3 μm) ca. 1.5 times that in background air and concentrations of large particles (0.3 < r < 1.3 μm) usually greater than twice that in the background. The ratio of the concentrations of small particles to large particles in the plume was about one-half of that in the background. © 1975.
Restrictions On The Potential And Cross Section For Collisions Between Rigid Rotors, Louis Biolsi Jr.
Restrictions On The Potential And Cross Section For Collisions Between Rigid Rotors, Louis Biolsi Jr.
Chemistry Faculty Research & Creative Works
A restricted distorted-wave treatment of the total cross section when two rigid diatomic molecules with orbital and nuclear spin angular momenta collide is examined. There are certain restrictions on the intermolecular potential and on the possible combinations of the various quantum numbers. These restictions are examined for the lowest order nonspherical elastic and the lowest order inelastic contributions to the total cross section. The effects of degeneracy averaging and of collisions between indistinguishable molecules are also briefly examined.
Effect Of Molecular Angular Momentum On The Thermal Conductivity Of A Multicomponent Gas Mixture, Louis Biolsi Jr., Edward Allen Mason
Effect Of Molecular Angular Momentum On The Thermal Conductivity Of A Multicomponent Gas Mixture, Louis Biolsi Jr., Edward Allen Mason
Chemistry Faculty Research & Creative Works
The effects of molecular angular momentum (spin polarization) on the thermal conductivity of a multicomponent gas mixture are considered. The Wang Chang-Uhlenbeck approach to the kinetic theory of gases with internal states is used. Formal results are obtained for the thermal conductivity of a gas mixture of uniform composition. These results are given in terms of the quantum mechanical degeneracy-averaged cross section.
The Effect Of Surface Impurities On The Thermal Accommodation Of Rare Gases On A Tungsten Surface, D. Vincent Roach, Louis Biolsi, Robert E. Harris
The Effect Of Surface Impurities On The Thermal Accommodation Of Rare Gases On A Tungsten Surface, D. Vincent Roach, Louis Biolsi, Robert E. Harris
Chemistry Faculty Research & Creative Works
A Rather Comprehensive Experimental Examination of the Effect of Surface Impurities (Potassium and Cesium) on the Thermal Accommodation of Rare Gases on a Tungsten Surface Has Been Made by Roach and Thomas. the Present Work Examines These Effects from a Theoretical Viewpoint with Particular Emphasis on the Effect on the Thermal Accommodation of Helium on a Tungsten Surface Caused by the Adsorption of Cesium Ions And/or Atoms. for This Examination, the Theory of Allen and Feuer Has Been Utilized using Reasonable Values of the Interaction Parameters for Helium with the Adsorbate as Well as the Force Constant for the Adsorbate-Substrate …
Effects Of Surfactants On Atomic Absorption Analysis Of Dilute Aqueous Copper And Nickel Solutions, Raymond L. Venable, Robert V. Ballad
Effects Of Surfactants On Atomic Absorption Analysis Of Dilute Aqueous Copper And Nickel Solutions, Raymond L. Venable, Robert V. Ballad
Chemistry Faculty Research & Creative Works
No abstract provided.
The Internal Chemical Shift. A Key To Bonding In Aromatic Molecules. I. Internal Shift Correlations, Donald W. Beistel, Holger E. Chen, P. J. Fryatt
The Internal Chemical Shift. A Key To Bonding In Aromatic Molecules. I. Internal Shift Correlations, Donald W. Beistel, Holger E. Chen, P. J. Fryatt
Chemistry Faculty Research & Creative Works
The study of proton shift behavior in nine families of disubstituted benzenes has provided quantitative correlations of internal and meta shifts among all families. The equations of correlation are useful in the prediction of shifts to an error of 0.015 ppm. The studies demonstrate shift additivity for the 4-substituted halobenzenes and suggest a chain rule relationship for substituent effects in those compounds. For that reason, previous theories of substituent interactions involving inductive and resonance contributors appear incorrect when applied to proton shift data. In decreasing order of up field shift at the ortho protons the substituents studied include N(CH3)2, NH2, …
Radiative And Predissociative Lifetimes Of The A ²Σ+ State Of Oh, Richard Orlin Sutherland, Richard A. Anderson
Radiative And Predissociative Lifetimes Of The A ²Σ+ State Of Oh, Richard Orlin Sutherland, Richard A. Anderson
Chemistry Faculty Research & Creative Works
Lifetime measurements have been made on the A 2Σ+ state of OH by the delayed coincidence technique in conjunction with an interrupted rf discharge through water vapor. Lifetimes are reported for rotational states up to K=29 and K=20 in the ν=0 and ν=1 vibrational levels, respectively, and on the unresolved levels of ν=2. A predissociation, previously predicted from relative intensity measurements, resulting from a curve crossing by the repulsive 4Σ− state, was observed for the rotational states above K=23 of ν=0, for those above K=14 of ν=1, and for all those of ν=2. These lifetime data are discussed qualitatively in …
Pmr Spectra Of The 4-Alkylnitrobenzenes, Donald W. Beistel, Hsin-Liang Chen
Pmr Spectra Of The 4-Alkylnitrobenzenes, Donald W. Beistel, Hsin-Liang Chen
Chemistry Faculty Research & Creative Works
Evidence of first-order alkyl-ring proton coupling is reported for the 4-alkylnitrobenzenes. Typical coupling constants of 0.7 Hz and 0.3 Hz were found for α-alkyl coupling with the ortho and meta ring protons, respectively, when the alkyl function was methyl, ethyl, and isopropyl. No β-alkyl coupling with ring protons was observed for the ethyl, isopropyl, or t -butyl groups, suggesting that the magnitude of the coupling constant is vanishingly small.
A Computer-Oriented Course In Chemical Spectroscopy, D. (Donald) W. Beistel
A Computer-Oriented Course In Chemical Spectroscopy, D. (Donald) W. Beistel
Chemistry Faculty Research & Creative Works
No abstract provided.
The Synthesis And Spectroscopic Properties Of Vanadium(Iii) Squarate Trihydrate, S. M. Condren, Hector O. Mcdonald
The Synthesis And Spectroscopic Properties Of Vanadium(Iii) Squarate Trihydrate, S. M. Condren, Hector O. Mcdonald
Chemistry Faculty Research & Creative Works
Vanadium(III) squarate trihydrate has been prepared; and the infrared, X-ray diffraction, and electronic spectra of the complex indicate that the central metal atom is in a slightly distorted octahedral field. A thermogravimetric study has shown that the complex loses three water molecules upon heating. A hydroxy-bridged, dimeric structure has been proposed from these data. © 1973, American Chemical Society. All rights reserved.
Distribution Of Mass And Charge In The Spontaneous Fission Of ²⁴⁴Cm, K. F. Flynn, B. Srinivasan, Oliver Manuel, Lawrence Elgin Glendenin
Distribution Of Mass And Charge In The Spontaneous Fission Of ²⁴⁴Cm, K. F. Flynn, B. Srinivasan, Oliver Manuel, Lawrence Elgin Glendenin
Chemistry Faculty Research & Creative Works
The distribution of mass and charge in the spontaneous fission of 244Cm has been investigated by radiochemical and mass spectrometric determination of the fission yields for 40 mass chains and 2 shielded nuclides (independent yields). The mass distribution is highly asymmetric with a relative probability of asymmetric-to-symmetric fission (peak-to-valley ratio) of greater than 5700. The average masses of the light and heavy groups are 103.1 and 138.7, respectively. The characteristics of the mass distribution, as well as the division of nuclear charge indicated by the independent yields of the two shielded nuclides, are consistent with the systematics established from …
Structural And Magnetic Properties Of [(Ch₃)₃Nh] Cucl₃2h₂O, D. B. Losee, J. N. Mcelearney, A. Siegel, Richard Lewis Carlin, A. A. Khan, J. P. Roux, William Joseph James
Structural And Magnetic Properties Of [(Ch₃)₃Nh] Cucl₃2h₂O, D. B. Losee, J. N. Mcelearney, A. Siegel, Richard Lewis Carlin, A. A. Khan, J. P. Roux, William Joseph James
Chemistry Faculty Research & Creative Works
The crystal structure at room temperature and the low-temperature heat capacity and magnetic susceptibilities of single crystals of [(CH3)3 NH]CuCl3 2H2O are reported. The monoclinic crystals belong to the space group P21c with a=7.479(10), b=7.864(11), c=16.730(23), =91.98(3)°, and Z=4. The structure consists of chains of edge-sharing [CuCl4(OH2)2] octahedra running along the a axis. Each copper atom is coordinated in a square plane by two water molecules and two chlorine atoms, with two more chlorine atoms at a longer distance. The susceptibility data can be fitted adequately between 1.5 and 20°K by a CurieWeiss law [ga=2.080.01, gb=2.020.01; gc=2.110.01; a=(0.380.03)°K, b=(0.360.03)°K, c=(0.410.03)°K], …
An Aircraft, Aerosol Sampling Program: Some Preliminary Results, J. F. Stampfer
An Aircraft, Aerosol Sampling Program: Some Preliminary Results, J. F. Stampfer
Chemistry Faculty Research & Creative Works
An aircraft sampling program to determine the vertical and size distributions of that part of the atmospheric aerosol with radius greater than 0.25 μ is described. The feasibility of using a single engine aircraft and a light scattering particle analyzer, for this work, is shown. Examples of the data are given and preliminary conclusions are drawn about the normal size distribution, effect of lapse rate on the vertical aerosol concentration gradient, effect of relative humidity on the size distribution, and the possibility of producing high concentrations of giant particles aloft. © 1972.
Studies On The Mechanism Of Action Of Nerve Growth Factor., D. (Daniel) B. Hier, B. G. Arnason, M. Young
Studies On The Mechanism Of Action Of Nerve Growth Factor., D. (Daniel) B. Hier, B. G. Arnason, M. Young
Chemistry Faculty Research & Creative Works
No abstract provided.
Conversions From Cyclohexanol: An Undergraduate Laboratory Project, Samir B. Hanna, James T. Wrobleski, Joseph T. Bohanon, Billy W. Peace
Conversions From Cyclohexanol: An Undergraduate Laboratory Project, Samir B. Hanna, James T. Wrobleski, Joseph T. Bohanon, Billy W. Peace
Chemistry Faculty Research & Creative Works
No abstract provided.
Anodic Dissolution Of Beryllium In Anhydrous Media, William Joseph James, Martin E. Straumanis
Anodic Dissolution Of Beryllium In Anhydrous Media, William Joseph James, Martin E. Straumanis
Chemistry Faculty Research & Creative Works
No abstract provided.