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  • 1
    Electronic Resource
    Electronic Resource
    Novel aspects of the real paracrystal (1981)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 85-91 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A revision of the mathematical concept of paracrystals is proposed. Hermann's [Z. Electrochem. (1940), 46, 425-436] early theory of mesophases represents a special case of a paracrystal where the statistical parameters introduced were merely crystalline or gas-like. The theory of paracrystals removes the black-white picture of crystalline and amorphous phases by introducing 18 new statistical parameters into conventional crystallography. It is shown that a real paracrystal can be defined by a three-dimensional convolution polynomial in combination with an empirically derived α* law. Hence, a missing corner-stone of colloid science is established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739481000156
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  • 2
    Electronic Resource
    Electronic Resource
    Monoamine oxidase activities in human brain microvessels (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 764-765 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Microvessels can be easily isolated from human brain samples obtained at autopsy. Human frontal cortex MAO type A and B activities are similar in microvessel and microvessel-free preparations. In microvessels, enzyme activities and the ratio of MAO type A to type B vary among the areas studied and could selectively regulate the passage of certain amines through the blood vessel wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01967968
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  • 3
    Electronic Resource
    Electronic Resource
    Induction of endoreduplication by hydrazine in Chinese hamster V 79 cells and reduced incidence of sister chromatid exchanges in endoreduplicated mitoses (1984)
    Springer
    Chromosoma 89 (1984), S. 79-84 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Hydrazine in high concentrations very effectively induces endoreduplication in Chinese hamster V 79 cells. The addition of 5-bromodeoxyuridine (BrdU) for the duration of one cell cycle prior to the induction of endoreduplication produces diplochromosomes with sister chromatid differentiation (SCD) after differential chromatid staining. The fact that diplochromosomes with complete SCD are obtained shows that endoreduplication was induced in cells that were in G2-phase. The analysis of sister chromatid exchanges (SCEs) showed that hydrazine treatment rarely led to increased SCE frequencies in mitoses after endoreduplication, but that it caused a strong SCE induction in diploid second division metaphases in the same culture. Neither catalase nor cysteine had an effect on the induction of endoreduplication or the incidence of SCEs. Treatment of the cells with mitomycin C prior to addition of BrdU led to increased SCE frequencies. Compared with the normal mitoses from the same preparation, the mitoses after endoreduplication showed a significantly reduced induction of SCEs. In contrast to these findings, SCE induction was not reduced in the common tetraploid V 79 cells after colcemid-induced polyploidization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302355
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  • 4
    Electronic Resource
    Electronic Resource
    Synergistic action of cysteamine and BrdU-substituted DNA in the induction of sister chromatid exchanges (1980)
    Springer
    Chromosoma 81 (1980), S. 461-471 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The effect of different BrdU-concentrations on the cysteamine-induced SCE-rate was investigated in V-79 Chinese hamster cell monolayer cultures. Both cysteamine and its auto-oxidation product cystamine act synergistically with BrdU in the induction of SCEs. A given concentration of these substances produces a low SCE-frequency at low BrdU-concentrations — but the incidence of SCEs is significantly increased at increased BrdU-concentrations. — Using one-cycle substitution experiments and the determination of the relative level of substitution by means of 3HBrdU-incorporation, this synergism was shown to depend on the BrdU incorporated in the DNA and on the extent to which this incorporation takes place.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00368156
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of fluctuations of a laser pump on the intensity correlation of resonance fluorescence radiation (1980)
    Springer
    Optical and quantum electronics 12 (1980), S. 65-76 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The influence of fluctuations of a relatively weak laser pump on the intensity correlation of resonance fluorescence radiation is studied for a laser acting both below and above the threshold. Below the threshold the radiation of the laser is characterized by Gaussian properties causing non-factorization of the intensity correlation function. Above the threshold the laser shows non-linear filter properties and, therefore, the deviation of the exact intensity correlation function from its factorized value is small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00625500
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  • 6
    Electronic Resource
    Electronic Resource
    Intensity correlation of the resonance fluorescence radiation from an atom driven by a laser pump with amplitude and phase fluctuations (1981)
    Springer
    Optical and quantum electronics 13 (1981), S. 301-307 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The influence of the phase and amplitude fluctuations of a relatively weak laser pump on the intensity correlations of the resonance fluorescence light from a single atom is studied. It is found that the contributions due to a non-Markovian dephasing of the laser light can be neglected in many cases. The amplitude fluctuations and the attendant non-factorizability of the intensity correlation function are shown to lead to a stronger correlation of the intensities of the resonance fluorescence light considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619795
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  • 7
    Electronic Resource
    Electronic Resource
    A X-ray line profile study on as-polymerized isotactic polypropylene (1984)
    Springer
    Colloid & polymer science 262 (1984), S. 885-891 
    Details
    ISSN: 1435-1536
    Keywords: Polypropylene ; x-ray scattering ; line porfile analysis ; paracrystal ; Ziegler-Natta catalyst
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The line profile analysis of high-resolution wide angle X-ray diffraction spectra (WAXS) has been employed to characterize two polypropylenes polymerized by: a) “conventional” Ziegler-Natta catalyst (PP-A) and b) “high-yield” new supported catalyst (PP-B). The observed differences in line-width are most reasonably due to a marked crystallite size anisotropy, more pronounced for PP-A. The smallest size is along the crystallographic a-axis, which is the preferred direction of growth of crystallites. Paracrystalline fluctuations, on the whole larger in the high-yield polymer than in the conventional one, are present. The diffuse background resulting from line profile analysis is preliminarily investigated here in terms of scattering from a microcrystalline array.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01452219
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  • 8
    Electronic Resource
    Electronic Resource
    A comparative study on steroid sulfatase and arylsulfatase C in fibroblast clones from 45,X/47,XXX and 69,XXY (1984)
    Springer
    Human genetics 〈Berlin〉 66 (1984), S. 367-369 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Steroid sulfatase (STS) and arylsulfatase C (ARSC) were studied in fibroblast clones from a 45,X/47,XXX mosaic and from a 69,XXY triploidy with one or two active X chromosomes. The comparison of the 47,XXX with 45,X clones showed an incomplete gene dosage effect (1.8 for STS and 2.0 for ARSC). This was not the case for the triploid clones with different X-inactivation patterns. These results confirm previous reports on the non-inactivation of the STS gene, and establish X linkage and non-inactivation for the ARSC gene as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00287644
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  • 9
    Electronic Resource
    Electronic Resource
    Expression of the fragile site Xq27 in fibroblasts (1983)
    Springer
    Human genetics 〈Berlin〉 64 (1983), S. 279-282 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An investigation of fibroblast clones from two females heterozygous for the Martin-Bell syndrome showed that the fibroblasts of these individuals consist of two subpopulations, one with cells expressing the fra(X)(q27) and another with cells in which this fragile site cannot be induced. This is to be expected and is in contrast to the fibroblast clones of hemizygous patients investigated earlier. The expression of fra(X)(q27) in females evidently depends on the presence of an X-linked defect with the normal allele inactivated on the other X chromosome. There may be a relationship between the mental status and the ratio of somatic cells with this defect on the active X and those cells with this defect on the inactive X chromosome in the heterozygotes. The divergence between the inactivation of the defective gene and expression of fra(X)(q27) on the late replicating X chromosome is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279411
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  • 10
    Electronic Resource
    Electronic Resource
    Manifestation of the fragile site Xq27 in fibroblasts (1983)
    Springer
    Human genetics 〈Berlin〉 65 (1983), S. 76-78 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A protocol is reported which allows the efficient induction of bromodeoxyridine (BrdU)-induced R-type replication patterns in fibroblast cultures prepared to demonstrate the fragile site fra(X)(q27). The technique includes partial synchronization of the culture by fluorodeoxyuridine (FdU) blocking at the G1/S transition. This block does not impair the induction of the fragile site in medium 199 containing methotrexate. The marked increase of the mitotic index in the synchronized culture may be an advantage in the study of folic acid sensitive fragile sites in fibroblasts. Adding BrdU after block removal leads to an efficient labeling of replicating chromosomes without severely impairing the manifestation of fra(X)(q27).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285034
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