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  • 1990-1994  (2)
  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 378-382 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A general procedure for the calculation of radii of gyration and scattering intensities of hollow triaxial bodies is proposed. By this method, equations for the radii of gyration and the scattering intensities of hollow bodies, i.e. isosceles triangular, rectangular and regular polygonal prisms, elliptic cylinder and ellipsoid, are obtained. Existing models are expressed as the limited case of present results. The scattering curves of regular polygonal prisms of more than six sides are practically the same as that of a column. The curves have a tendency to become less undulant according to the decrease in isotropy of the body shape and the size of the hollow.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 395-395 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Equations (15), (16), (17), (18), and (20) in the paper by Hiragi & Ihara [Acta Cryst. (1981), A37, 378-382] are incorrect. These equations should be as follows: \ matrix { F = 4A^{2}C \Biggl [ \sum_{k=l}^{n} f \Biggl ( s_{1},\varphi - {{2\pi}\over{n}}k \Biggr ) \Biggr ] \Psi _{c}, \cr f(s_{1},\beta) = \Biggl [s_{1}^{2}A^{2} \Biggl ( \tan ^{2} {{\pi}\over{n}} \sin ^{2} \beta - \cos ^{2} \beta \Biggr ) \Biggr ]^{-1},}\eqno (15) \matrix { x \Biggl { \exp(is_{1} A \cos \beta) \cr x \Biggl [ i \cot \beta \sin \Biggl ( s_{1} A \tan {{\pi}\over{n}} \sin \beta \Biggr ) \cr - \tan {{\pi}\over{n}} \cos \Biggl ( s_{1} A \tan {{\pi}\over{n}} \sin \beta \Biggr ) \Biggr ] + \tan {{\pi}\over{n}} \Biggr }, } \eqno (16)V = 2\pi ABC, \eqno (17)F = {{4\pi ABCJ_{1}(s_{1}, K)}\over{s_{1} K}} \Psi _{C} \eqno (18)F = 4\pi ABC{{\sin (sL) - sL \cos (sL)}\over{(sL)^{3}}} \eqno (20) Equations (15) and (16) in the original article lead to incorrect scattering intensity, whereas equations (17), (18), and (20) give the correct but unnormalized value. The figures in the article were calculated with the correct equations and hence need no alteration.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The human cytomegalovirus (strain Towne) temperature-sensitive mutant ts 256 exhibits a virus specific DNA polymerase-negative phenotype. The position of the mutation of ts 256 was determined by three step marker-rescue assays to be within a 5.1 kbXbaI-BamHI fragment between map unit 0.33 and 0.35 in aHindIII-D fragment located in a long unique region. Nucleotide sequencing showed that the 5.1 kb fragment contained three open reading frames corresponding to those of the genes for UL52, UL53 and UL54 (DNA polymerase gene), respectively, of strain AD169. The functions of UL52 and UL53 are unknown. Comparison of the DNA sequences of the 5.1 kb fragments of the wild-type and ts 256 mutant revealed two base changes within UL53 and UL54, respectively, which result in amino acid substitutions. The mutation in the UL54 gene was located within a distinct conserved region VI common to α-like DNA polymerases, suggesting that this base change would be responsible for DNA negative phenotype.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Probability theory and related fields 84 (1990), S. 453-471 
    ISSN: 1432-2064
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary Continuous time communication channels with additive noise are considered under an average power constraint. The noises are assumed to be Gaussian processes equivalent (or mutually absolutely continuous) to a Brownian motion. We study the problem whether the capacity of the channel is increased by feedback or not. It is given a sufficient condition under which the capacity is not increased by feedback. It is also given an example of a channel whose capacity is doubled by feedback.
    Type of Medium: Electronic Resource
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