Results 221 to 230 of about 461,814 (281)

Lethal effects of a hyperactive dGTP triphosphohydrolase in E. coli. [PDF]

Genetics
Bhawsinghka N, Glenn KF, Klemm BP, Singh D, Day RC, Cochran RZ, Schaaper RM.   +6 more
europepmc   +1 more source

Joyce Structures from Quadratic Differentials on the Sphere. [PDF]

Commun Math Phys
Moy T.
europepmc   +1 more source

Self-Affine Tiling via Substitution Dynamical Systems and Rauzy Fractals

Pacific Journal of Mathematics, 2002
In this paper we show that a class of sets known as the Rauzy fractals, which are constructed via substitution dynamical systems, give rise to self-affine multi-tiles and self-affine tilings.
Victor F. Sirvent
exaly   +2 more sources

Combined Invariants to Gaussian Blur and Affine Transformation [PDF]

, 2021
The paper presents a new theory of combined moment invariants to Gaussian blur and spatial affine transformation. The blur kernel may be arbitrary oriented, scaled and elongated.
Jitka Kostkova, Jan Flusser, Matteo Pedone   +2 more
exaly   +2 more sources

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Electron affinities of substituted nitrobenzenes

Canadian Journal of Chemistry, 1989
The electron affinities of 14 substituted nitrobenzenes including nitrobiphenyls were determined by measurement of electron transfer equilibria [1] in the gas phase with a pulsed high pressure mass spectrometer: A− + B = A + B− [1]. These data, when combined with previous determinations from this laboratory, lead to electron affinities for 35 ...
S. Chowdhury, H. Kishi, G. W. Dillow, P. Kebarle   +3 more
openaire   +2 more sources

Proton affinities of substituted cyanides

Journal of Molecular Structure: THEOCHEM, 1986
Abstract Molecular orbital calculations at the ab initio STO-3G, 3–21G, 4–31G, and 6–31G* bases have been made for the relative proton affinities of an extended series of substituted cyanides, XCN. It is shown that geometry optimization at the 3–21G level is adequate and that 3–21G//3–21G calculations give very similar results to those obtained at ...
Stephen Marriott, Ronald D. Topsom, Carlito B. Lebrilla, Ilmar Koppel, Masaaki Mishima, Robert W. Taft   +5 more
openaire   +1 more source

Proton affinities of substituted methylamines

Journal of Molecular Structure: THEOCHEM, 1989
Abstract Molecular orbital calculations at the ab initio STO-3G, 3-21G, 6-31G and 6-31G∗ (5D) bases have been performed for the relative proton affinities of an extended series of substituted methylamines, XCH2NH2. The minimal basis STO-3G calculations give closest agreement with experiment averaged over all substituents for which comparisons are ...
Tony Silvestro, Ronald D. Topsom, Charles W. Bock, Robert W. Taft   +3 more
openaire   +1 more source

Electrophile Affinity: A Reactivity Measure for Aromatic Substitution

Journal of the American Chemical Society, 2009
The reactivity and regioselectivity of the electrophilic chlorination, nitration, and alkylation of benzene derivatives were rationalized by comparing literature data for the partial rate factors (ln f) for these S(E)Ar processes with theoretical reactivity parameters.
Gergana, Koleva, Boris, Galabov, Judy I, Wu, Henry F, Schaefer, Paul von R, Schleyer   +4 more
openaire   +2 more sources

Vertical electron affinities in substituted trimethylsilanes

Journal of Organometallic Chemistry, 1997
Abstract The gas-phase negative electron affinities obtained by means of electron transmission spectroscopy (ETS) in the series (CH3)3SiX (with X = I, Br, Cl, Si(CH3)3, SCH3, OCH3, N(CH3)2, CH3) are compared. The electron-acceptor properties of these compounds increase when the substituent contains third-row (or heavier) elements.
MODELLI A, SCAGNOLARI F, DISTEFANO, Giuseppe, DAL COLLE, Maurizio   +3 more
openaire   +1 more source