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991.
We investigate finite affine planes of even order possessing a parabolic oval and a collineation group G which leaves invariant and acts 2-transitively on its affine points. The main attention is devoted to translation planes. The odd order case has already been
considered by Enea and Korchmaros in [5]. Our main result shows that if has even order and possesses two 2-transitive parabolic ovals which share at least two, but not all their affine points, then is Desarguesian.
Received 20 July 1998. 相似文献
992.
Podder N.K. Mezonlin E.-D. Johnson J.S. III 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》2001,29(6):965-969
A microwave plasma in argon is generated inside a pyrex tube by a 3-kW power supply in combination with a magnetron, wave guide, and a resonant cavity. The gas pressure is varied from 200 to 2000 mtorr, and the microwave output power is varied from 600 to 1200 W. Plasma parameters are determined by using a single Langmuir probe. Bias voltage and current characteristic curves are analyzed for the determination of electron temperature, density, and plasma potential. Electron density is found to be in the range of 1.4-7.6 × 1011 cm-3 , electron temperature 4.2-6.2 eV, and plasma potential 22.6-35.6 volts. Turbulence in plasma emissions can now be studied in these various regimes using Ar I lines 相似文献
993.
The reactions between F2 and the lowest members of the homologous series of perfluoroalkyl iodides (CF3I, C2F5I, and n-C3F7I) have been studied. For these compounds, an exponential decrease in the alkyl iodide concentration over time following an induction period is observed for certain experimental conditions. Other conditions lead to chaotic-like kinetic behavior where the rate of alkyl iodide consumption continually changes. Kinetic rate data with CF3I show that the disappearance rate depends upon both the type of surface and surface preparation. For all three compounds, Arrhenius plots reveal activation energies on the order of 10 kcal/mol, consistent with effective initiation steps of F2 + RI → RIF + F, where R represents the CF3, C2F5, or n-C3F7 radical respectively. The end products of the F2 + RI reactions are RF, R2, and IF5, suggesting that the R radicals play an important kinetic role. Introducing O2 into the F2 + RI reaction systems results in successive oxidation of R by O2, leading to the formation of CF2O as an additional end product. IF(B → X) emission is observed from the RI-rich F2 + RI reactions, confirming the existence of IF as an intermediate. © 1996 John Wiley & Sons, Inc. 相似文献
994.
Lester C. E. Taylor Robert L. Johnson Roberto Raso 《Journal of the American Society for Mass Spectrometry》1995,6(5):387-393
We report the introduction and use of an atmospheric pressure chemical ionization liquid chromatography-mass spectrometry instrument that has been designed specifically for use by the synthetic chemist on an open access, walk-in basis. This instrument has been configured with an easy-to-use sample log-in terminal that requires the user to provide only a sample identification number and a user name. Sample analysis takes approximately 4 min and provides the synthetic and medicinal chemist with rapid and reliable mass spectrometry analysis. Since installation of the system, it has analyzed an average of about 80 samples per day and has the capacity to run over 100 samples per day without the intervention of a specialist operator. This capability has eliminated the need for an operator to analyze routine samples and allows the mass spectroscopist more time to deal with problem solving. 相似文献
995.
Simon R. Drake Brian F. G. Johnson Jack Lewis 《Journal of organometallic chemistry》1988,340(3):C31-C36
The heteronuclear clusters [Os10C(CO)24(MPR3nm− (n = 1, m = 1; 2: M = Au; 3: M = Ag; 4: M = Cu; 5 n = 2, m = 0, M = Ag) have been prepared. These clusters undergo molecular rearrangements in solution, and two isomeric forms of 2, 3, 4, 5 and 6 have been identified. This interconversion is thought to involve a cap [lrarr2] edge bridge [lrarr2] cap pathway. 相似文献
996.
Philip A. Baker Andrew F. Coffey Roger Epton Tony Johnson Edward J. Mole 《Macromolecular Symposia》1988,19(1):79-91
2, 4-Dinitrophenyl-L-phenylalanine has been coupled to L-, D-, and DL-amino acid phenyl esters pendant upon a polymer matrix. The esters had been prepared by di-isopropylcarbodiimide-mediated condensation, catalyzed by 4-dimethylaminopyridine. Reverse phase high pressure liquid chromatography (HPLC), using elution solvents consisting of 10 vol.-% trifluoroacetic acid in water/acetonitrile mixtures, has been used to investigate the 2,4-dinitrophenyl L-L and L-D dipeptide mixtures obtained on hydrazinolysis of each of the dipeptide-matrix assemblies. ‘Hydrazinolysis-HPLC’ has been used also to determine intermediate peptide homogeneity in ultra-high load solid (gel) phase synthesis with Boc amino acids. Cross-linked poly(N-[2-(4-hydroxyphenyl)ethyl]acrylamide) and two derived polymers incorporating spacer groups have been used as supports. The spacer groups made possible peptide C-terminal attachment by either HF-labile benzyl ester or HF-labile cyclohexyl ester bonds, while still incorporating the phenolic ester linkage susceptible to rapid hydrazinolytic scission. 相似文献
997.
Zi Jie Lin Jared Bies Shanina S. Johnson John D. Gorden Jacqueline F. Strickland Monica Frazier Jonathan M. Meyers Kerri L. Shelton 《Journal of heterocyclic chemistry》2019,56(2):533-538
A series of 1,4‐N,N′‐bis‐substituted 1,2,4‐triazolium bromide salts were synthesized and tested for anti‐proliferative activity. 1,4‐Bis(naphthalen‐2‐ylmethyl)‐1,2,4‐triazolium bromide ( 2 ) showed activity against MDA‐MB‐468 breast cancer and PC‐3 prostate cancer cell lines. 相似文献
998.
Dr. Alice Johnson Prof. Dr. M. Concepción Gimeno 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(49):11256-11265
Yldiides have unique electronic properties and donor abilities, but as ligands in transition metal complexes they are scarcely represented in the literature. Here, the controlled synthesis of a series of polynuclear gold yldiide complexes derived from triphenyl(cyanomethyl)phosphonium bromide, [Ph3PCH2CN]Br, under mild conditions is described. Anionic dinuclear NBu4[(AuX)2{C(CN)PPh3}] (X=Cl, C6F5) or trinuclear derivatives NBu4[Au3X2{C(CN)PPh3}] bearing terminal chloride or pentafluorophenyl groups and bridging yldiide ligands have been prepared. These compounds evolve in solution giving rise to the formation of an unprecedented tetrameric gold cluster, [Au4{C(CN)PPh3}4], by the loss of the gold complex NBu4[AuX2]. This gold cluster can also be prepared in high yield by a transmetalation reaction from the analogous tetrameric silver cluster, and two geometric isomers have been characterised, their formation dependent on the synthetic route. The triphenylphosphonium cyanomethyldiide ligand has also been used to build different dinuclear and trinuclear cationic complexes bearing phosphine or diphosphine ancillary ligands and bridging yldiide moieties. Further coordination through the cyano group of the yldiide ligand gives heterometallic trinuclear or pentanuclear derivatives. Structural characterisation of many of these compounds reveals the presence of complex molecular systems stabilised by gold⋅⋅⋅gold interactions and bridging yldiide ligands. 相似文献
999.
1000.
Jacob St-Gelais Émilie Côté Danny Lainé Prof. Paul A. Johnson Prof. Denis Giguère 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(59):13499-13506
In this work, we synthesized all mono-, di-, and trifluorinated glucopyranose analogues at positions C-2, C-3, C-4, and C-6. This systematic investigation allowed us to perform direct comparison of 19F resonances of fluorinated glucose analogues and also to determine their lipophilicities. Compounds with a fluorine atom at C-6 are usually the most hydrophilic, whereas those with vicinal polyfluorinated motifs are the most lipophilic. Finally, the solvation energies of fluorinated glucose analogues were assessed for the first time by using density functional theory. This method allowed the log P prediction of fluoroglucose analogues, which was comparable to the C log P values obtained from various web-based programs. 相似文献