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  • Chemistry  (8)
  • 53C05  (1)
  • Bayes estimators  (1)
  • Wiley-Blackwell  (8)
  • Springer  (2)
  • American Chemical Society
  • Hindawi
  • Public Library of Science
  • 1995-1999  (4)
  • 1975-1979  (6)
Collection
Keywords
Publisher
  • Wiley-Blackwell  (8)
  • Springer  (2)
  • American Chemical Society
  • Hindawi
  • Public Library of Science
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    On Best Equivariance and Admissibility of Simultaneous MLE for Mean Direction Vectors of Several Langevin Distributions (1998)
    Springer
    Annals of the Institute of Statistical Mathematics 50 (1998), S. 715-727 
    Details
    ISSN: 1572-9052
    Keywords: Admissibility of estimators ; Bayes estimators ; best equivariant estimator ; Langevin distribution ; mean direction vector ; Stein effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The circular normal distribution, CN(μ, κ), plays a role for angular data comparable to that of a normal distribution for linear data. We establish that for the curved and for the regular exponential family situations arising when κ is known, and unknown respectively, the MLE $$\widehat\mu$$ of the mean direction μ is the best equivariant estimator. These results are generalized for the MLE $$\widehat{\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\thicksim}$}}{\mu } }$$ of the mean direction vector $$\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\thicksim}$}}{\mu } = (\mu _1 , \ldots ,\mu _p )'$$ in the simultaneous estimation problem with independent CN(μ $$_i$$ , ϰ), i = 1,..., p, populations. We further observe that $$\widehat{\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\thicksim}$}}{\mu } }$$ is admissible both when κ is known or unknown. Thus unlike the normal theory, Stein effect does not hold for the circular normal case. This result is generalized for the simultaneous estimation problem with directional data in q-dimensional hyperspheres following independent Langevin distributions, L( $$L(\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\thicksim}$}}{\mu } _i ,\kappa ),i = 1, \ldots ,p$$ .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003712930390
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  • 2
    Electronic Resource
    Electronic Resource
    A new 2-form for connections on surfaces with boundary (1995)
    Springer
    Letters in mathematical physics 34 (1995), S. 135-147 
    Details
    ISSN: 1573-0530
    Keywords: 53C05 ; 58D27 ; 81T13
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract A natural gauge-invariant 2-form is introduced on the space of connections over a compact oriented surface with boundary. It is shown that this 2-form descends to the moduli space of flat connections, under a group of based gauge transformations. An explicit expression (in terms of holonomy variations) is given for the resulting 2-form, and it is related to the symplectic structure of the extended moduli space introduced by L. C. Jeffrey.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00739092
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  • 3
    Electronic Resource
    Electronic Resource
    7-Amino-actinomycin D complexes with deoxynucleotides as models for the binding of the drug to DNA (1979)
    New York : Wiley-Blackwell
    Biopolymers 18 (1979), S. 1749-1762 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fluorescence, CD, absorption, and 1H-nmr studies are reported for complexes of 7-amino-actinomycin D with deoxydinucleotides, deoxytetranucleotides, and poly(dG-dC)· poly(dG-dC). The optical spectra for the 7-amino-actinomycin D complex with pdG-dC, pdG-dC-dG-dC and pdC-dG-dC-dG are similar in shape to the 7-amino-actinomycin D complex with either DNA or poly(dG-dC). The changes in the 1H chemical shifts of the 7-amino-actinomycin D and the pdG-dC resonances that accompany complex formation show that 7-amino-actinomycin D forms a minature intercalated complex with two pdG-dC molecules. The magnitudes of the induced chemical shifts for the 7-amino-actinomycin D complex formation with pdG-dC are similar to, but slightly different from, the induced chemical shifts which are obtained when actinomycin D forms a minature intercalated complex with two pdG-dC molecules. The pdN-dG dinucleotides (N = C, A, or T) form stacked complexes with 7-amino-actinomycin D. The presence of the 7-amino-group results in a larger dimerization constant (in aqueous solution) for 7-amino-actinomycin D [KD(6°C) = 4.4 × 103M-1], as compared to actinomycin D [KD(6°C) = 1.7 × 103M-1]; the chemical shifts which accompany dimer formation indicate that the chromophores stack in an inverted manner. Intercalation of 7-amino-actinomycin D into minature double helices, as well as into calf thymus DNA, poly(dG-dC)·poly(dG-dC), and poly(dA-dC)·poly(dG-dT), results in an enhancement of the relative fluorescence intensity and a shift in both the absorbance and corrected emission spectra.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1979.360180712
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  • 4
    Electronic Resource
    Electronic Resource
    Über Pterinchemie. 62. Mitteilung. Protonenkatalysierte [1,2]-H-Verschiebung bei der Umlagerung von 6,7-Diphenyl-5,6-dihydropterin zu 6,7-Diphenyl-7,8-dihydropterin (1977)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 60 (1977), S. 922-924 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Proton catalysed [1,2]-H-shift in the rearrangement of 6,7-diphenyl-5,6-dihydropterine (I) to 6,7-diphenyl-7,8-dihydropterine (III)The arrangement from I to the thermodynamically more stable III undergoes through a acid catalysed [1,2]-H-shift (intramolecular 6,7-hydride rearrangement) (see Scheme 1).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19770600322
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  • 5
    Electronic Resource
    Electronic Resource
    EXSENSEL - a rule-based approach to selection of sensors for process variables (1996)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 19 (1996), S. 443-447 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A novel expert-system-based method for selection of sensors for process variables is presented. EXSENSEL (expert system based sensor selection) deals with 12 process variables and currently has 94 rules in its knowledge base. Despite its large knowledge base, users have to answer a set of only a few questions regarding a particular process variable, which is selected from a menu of 12 variables. A general description of the chosen process variable can be viewed before invoking the rules. Once a sensor has been selected, a brief write up on that particular sensor is also available on user's request. EXSENSEL is the successor to TRANSELEX, which is a single expert system for selection of transducers in the area of temperature, pressure, and flow measurement.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270190510
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  • 6
    Electronic Resource
    Electronic Resource
    Quantum fluid density functional theory of time-dependent processes (1998)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 69 (1998), S. 279-291 
    Details
    ISSN: 0020-7608
    Keywords: quantum fluid density functional theory ; quantum theory of motion ; time-dependent processes ; electronegativity ; hardness ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A quantum fluid density functional theory has been developed through an amalgamation of the quantum fluid dynamics and the time-dependent density functional theory. It is used in studying typical time-dependent processes like ion-atom collisions and atom-field interaction. Temporal evolution of chemical reactivity parameters as electronegativity, hardness, entropy, and polarizability is monitored for a He atom in its ground and excited states interacting with an external electric field and an incoming proton. It is observed that these reactivity parameters either remain static or oscillate with the external field in the atom-field interaction case, whereas during the collision process, hardness and entropy maximize and polarizability minimizes for both the electronic states of the atom. The possibility of a quantum theory of motion within the purview of this quantum fluid density functional framework is also explored.   © 1998 John Wiley & Sons, Inc. Int J Quant Chem 69: 279-291, 1998
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Über Pterinchemie 52. Mittelung [1] Eine eindeutige Synthese isomerenfreier Pteroyl-γ-L-glutamyl-γ-L-glutamyl-L-glutaminsäure (1975)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 58 (1975), S. 1374-1379 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new and unequivocal synthesis of pteroyl-γ-L-glutamyl-γ-L-glutamyl-L-glutamic acid free of isomers is described. A melt of N(2′)-acetyl-6-formylpterine and tetramethyl-N-(p-amino-benzoyl)-γ-L-glutamyl-γ-L-glutamyl-L-glutamatewas quantitatively converted to the corresponding azomethin IX. NaBH4-reduction followed by basic hydrolysis of acetyl and methylester groups gives pure pteroyl-γ-L-glutamyl-γ-L-glutamyl-L-glutamic acid in good yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19750580516
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  • 8
    Electronic Resource
    Electronic Resource
    Über Pterinchemie. 54. Mitteilung [1]. Eine allgemeine Methode zur Synthese von Folsäure, Folsäurekonjugaten und FolsäureanalogenTeilweise von P. K. Sengupta anlässlich des 5 Internationalen Pteridin-Symposiums in Konstanz, BRD (14.-18. April 1975) vorgetragen. (1976)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 59 (1976), S. 242-247 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A general method for synthesis of folic acid, its conjugates and analogues.A new and general method for the synthesis of folic acid, folic acid conjugates and folic acid analogues is described. The key step, i.e. the condensation of N(2′)-acetyl-6-formyl-pterine (I: R1 = COCH3) with aminoaryl derivatives II, is achieved by refluxing in absolute ethanol to afford the azomethines III. NaBH4-reduction followed by basic hydrolysis gives pure V products in high yield, free from 7-isomers.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19760590127
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  • 9
    Electronic Resource
    Electronic Resource
    Graft copolymerization of styrene onto polyacrylonitrile via thioamide formation (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 15 (1977), S. 501-505 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.130150810
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  • 10
    Electronic Resource
    Electronic Resource
    Mechanistic studies on the Reactions of Cis-Diaquobis (Biguanide)Chromium(III) ion with 2,2′-dipyridyl and 1,10-phenanthroline (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 424 (1976), S. 93-96 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Untersuchungen der Mechanismen der Reaktionen des cis-Diaquobis(biguanid)-Chrom(III)-Ions mit 2.2′-Dipyridyl und 1.10-PhenanthrolinKinetische Untersuchungen in wäßriger Lösung über den Austausch der Wasser-Liganden im cis-[Cr(BigH)2(OH2)2]3+ (BigH = Biguanid, C2H7N5) durch 2.2′-Dipyridyl bzw. 1.10-Phenanthrolin (phen) unter Bildung von [Cr(BigH)2(AA)]3+ (AA = dipy bzw. phen) wurden spektralphotometrisch durchgeführt.
    Notes: Kinetic studies in aqueous solution on the replacement of the aqua ligands in cis-[Cr(BigH)2(OH2)2]3+ (BigH = biguanide, C2H7N5) by 2,2′-dipyridyl (dipy) and 1,10-phenanthroline (phen) forming [Cr(BigH)2(AA)]3+ (AA = dipy or phen) have been made spectrophotometrically. In both the cases the reaction proceeds by a path purely first-order with respect to the ligand. From the values of the rate constant at four different temperatures, values of the activation parameters, ΔH≠ and ΔS≠, have been evaluated for each system. The results are consistent with a mechanism involving outer-sphere association of the reactants followed by transformation of the outer-sphere complex in a dissociative process.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19764240114
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