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  • 1
    Electronic Resource
    Electronic Resource
    Spectrophotometric Determination of Total Erythrocyte Copper (1961)
    s.l. : American Chemical Society
    Analytical chemistry 33 (1961), S. 1594-1598 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60179a040
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular charge-transfer cross sections and their correlation with reactant ion structures (1985)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 4027-4031 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100265a019
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  • 3
    Electronic Resource
    Electronic Resource
    Extragalactic H II Regions (1990)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 28 (1990), S. 525-560 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.28.090190.002521
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  • 4
    Electronic Resource
    Electronic Resource
    Conformational Analysis of Macrocyclic Ether Ligands. I. 1,4,7,10-Tetraoxacyclododecane and 1,4,7,10-Tetrathiacyclododecane (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 241-251 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Crystallographic results retrieved from the Cambridge Structural Database (CSD) have been used to perform systematic conformational analyses of both free and metal-coordinated unsaturated 12-membered oxa and thia macrocycles. Conformational classifications established using symmetry-modified Jarvis–Patrick clustering are visualized in conformational space by principal component analysis (PCA) plots. These show that the relationship between cluster populations and relative molecular mechanics energies is modified by the coordination requirements of a metal ion. With oxa donors the [3333] conformer (oxygen in edge positions) predominates for metal-coordinated macrocycles, with the donor atoms in a square-planar arrangement, whilst the [48] conformer occurs bound in a cis-octahedral fashion to metal ions and the [66] conformer does not bind in an endo-dentate manner at all. The [3333] and [66] conformers are both common for free ligands, reflecting their similar molecular mechanics energies; the conformation is often determined by the hydrogen-bonding network. There are few thia examples: it is found that conformers with low molecular mechanics energies are unsuited to metal coordination and substantial reorganization is necessary for chelation. The differences in behaviour of oxa and thia macrocycles may be rationalized in terms of differing torsion-angle preferences for CXCC and XCCX units (X = O, S).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768196013663
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  • 5
    Electronic Resource
    Electronic Resource
    Conformational Analysis of Macrocyclic Ether Ligands. II. 1,4,7,10,13-Pentaoxacyclopentadecane and 1,4,7,10,13-Pentathiacyclopentadecane (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 476-489 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Crystallographic results retrieved from the Cambridge Structural Database (CSD) have been used to perform a systematic conformational classification of free and metal-coordinated unsaturated 15-membered oxa and thia macrocycles using symmetry-modified Jarvis-Patrick cluster analysis. Relative molecular mechanics energies of the observed conformations are compared with the cluster populations. With oxa donors a uniangular and a [348] conformer predominate for larger metal ions; these lie above the donor atom plane with 1–6 additional ligands bound on the same side. With smaller cations an anangular conformer is adopted, the O atoms describing the equatorial plane of a pentagonal bipyramid. Other conformers occur as dictated by the coordination environment, particularly if not all donor atoms are metal-bound; in some cases the conformation is determined by a hydrogen-bonded network. In some thia examples the ligand binds to an axial/apical and four equatorial sites of the coordination polyhedron; in others containing AuI or AgI the metal is linearly or tetrahedrally coordinated with additional M—S interactions. With mixed donors, the hard/soft characteristics of the metal determine the coordination mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768196015303
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  • 6
    Electronic Resource
    Electronic Resource
    Broad emission lines of QSOs are consistent with rotating supermassive stars (1983)
    [s.l.] : Nature Publishing Group
    Nature 305 (1983), S. 407-409 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The broad-line intensity ratios can be understood in terms of optically thick clouds of solar composition photoionized by the UV and X-ray continuum1'3. This requires gas densities N - 1095 cm"3 and an 'ionization parameter' G?? = f??/Nc 1015, where ^uv^lO^cnT2 is the flux of ionizing photons ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/305407a0
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal continuum from accretion disks in quasars (1978)
    [s.l.] : Nature Publishing Group
    Nature 272 (1978), S. 706-708 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Matter spiralling into a black hole of mass MH = (108 M8 produces a power3 L " (0.2c2) M = (IO461 erg s-1) M0 (1) where M0 = M/1 M Q yr"1. Combined with the Eddington limit, LEd=(104e-1ergs-1)M8, (2) this suggests that a luminous QSO may be powered by accretion at a rate 1 M0 yr"1 onto a black ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/272706a0
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  • 8
    Electronic Resource
    Electronic Resource
    Gravitation, primordial stars and the dark mass (1978)
    [s.l.] : Nature Publishing Group
    Nature 273 (1978), S. 519-520 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The velocity dispersions of clusters of galaxies imply virial masses much larger than the combined mass in the visible galaxies1'2. Most of the mass of a rich cluster evidently consists of matter between the galaxies with mass-to-light ratio (in solar units) M/L 〈 300, exceeding M/L for the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/273519a0
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  • 9
    Electronic Resource
    Electronic Resource
    Origin of the black hole in Cyg X-1 (1976)
    [s.l.] : Nature Publishing Group
    Nature 259 (1976), S. 642-643 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Supernova models based on either the degenerate cores of intermediate mass stars (4-8M0, see ref. 2) or the iron cores of more massive stars3, suggest a collapsing core of initial mass 1.4M0 and hence a final gravitational mass of 1.2M0. In the more massive stars the collapse of some material of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/259642a0
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  • 10
    Electronic Resource
    Electronic Resource
    A cytological description of sibling species of Simulium (Gnus) arcticum (Diptera: Simuliidae) (1982)
    Springer
    Polar biology 1 (1982), S. 181-192 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Cytological descriptions are presented for five sibling species in the Simulium arcticum complex. These are designated: IIL-st. (standard), IIL-1, IIL-2, IIL-3, and Il-3.4 for the sequences involved in sex determination. Descriptions are given in terms of standard maps of polytene chromosomes based on IIL-st. arcticum. Closest members are sympatric; they differ in sex chromosomes but share band polymorphisms and/or floating inversions. The centromere band, CII may be thin (CIIt) or enhanced (CIIe) and the inversion IIL-2 is an autosomal polymorphism in some members but sex-linked, fixed or lost in other members of the complex. A novel B-chromosome system occurs in IIL-st. and IIL-2 siblings. B's are eliminated from the soma of both sexes, i.e. they are confined to the germline. Females are further unique in that all B-containing individuals exhibit mosaicism in the oogonia. The B-chromosomes are large arcocentrics and their frequency distribution is non-Poisson.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00287005
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