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  • Articles  (97)
  • 2010-2014  (36)
  • 1990-1994  (28)
  • 1985-1989  (15)
  • 1960-1964  (16)
  • 1950-1954
  • 1940-1944
  • 1930-1934  (2)
  • Chemistry and Pharmacology  (97)
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  • Articles  (97)
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  • 1
    Electronic Resource
    Electronic Resource
    Ultraviolet-light-induced oxide formation on GaAs surfaces (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 7951-7961 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a study of deep-ultraviolet-light-enhanced (4.1〈hν〈5.1 eV) oxygen reactions on GaAs from submonolayer to several monolayers coverage. The reaction is nonthermal and does not involve gas-phase excitation or dissociation of O2. Our experiments show a distinct wavelength and coverage dependence for the photoenhancement. X-ray photoelectron spectroscopy has been used to examine the chemical nature of the oxygen adsorbate and the GaAs oxides in order to find intermediate reaction species and evidence of the reaction pathways. The roles of photons and photogenerated carriers in the reaction enhancement mechanism are discussed. The results indicate that a mechanism based on photoemission of electrons into the growing oxide film is most in accord with the experimental observations. Such electron emission would increase the field-driven transport of oxygen to the GaAs interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459325
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental and theoretical investigation of the electrostatic persistence length of flexible polyelectrolytes at various ionic strengths (1992)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 96 (1992), S. 4008-4014 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100189a019
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  • 3
    Electronic Resource
    Electronic Resource
    Chain statistics of poly(diacetylenes) in solution (1986)
    s.l. : American Chemical Society
    Macromolecules 19 (1986), S. 399-405 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00156a029
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  • 4
    Electronic Resource
    Electronic Resource
    Comment on "Conformation of polydiacetylene macromolecules in solution: Field induced birefringence and rotational diffusion constant'' (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 1057-1058 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450599
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  • 5
    Electronic Resource
    Electronic Resource
    Electron density studies of KCl and LiF by γ-ray diffractometry (1985)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 41 (1985), S. 171-175 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Use of hard electromagnetic radiation (λ = 0.12 Å) in diffraction experiments, in conjunction with thin crystals in transmission geometry (Laue case), minimizes multiple scattering, often referred to as the 'extinction problem'. A large crystal slab, completely intercepting the incident beam, was used in this experiment. Several structure factors have been measured in LiF and KCl, with greater accuracy than ever before, using the γ-ray spectrometer of the University of Missouri at Columbia. In the case of LiF the results indicates some compression of the valence electron densities, similar to what has been found earlier for NaF. In the case of KCl all reflections agree well with the values calculated from free-atom Hartree-Fock wave functions except for the 004 and 006, which are appreciably weaker than corresponding reflections with similar or identical sin θ/λ values. This result indicates asphericity of the valence electron density. The 111 is also much weaker than the calculated value, indicating that the negative ions are slightly compressed and the positive ions slightly expanded with respect to the free-ion charge densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767385000344
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  • 6
    Electronic Resource
    Electronic Resource
    3 C 273 : A Star-Like Object with Large Red-Shift (1963)
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 1040-1040 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE only objects seen on a 200-in. plate near the positions of the components of the radio source 3(7 273 reported by Hazard, Mackey and Shimmins in the preceding article are a star of about thirteenth magnitude and a faint wisp or jet. The jet has a width of 1*2* and extends away from the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1971040a0
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  • 7
    Electronic Resource
    Electronic Resource
    Hydrogen bonding in basic copper salts: a spectroscopic study of malachite, Cu2(OH)2CO3, and brochantite, Cu4(OH)6SO4 (1993)
    Springer
    Physics and chemistry of minerals 20 (1993), S. 27-32 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Infrared and Raman spectra of the basic copper salts malachite, Cu2(OH)2CO3, and brochantite, Cu4(OH)6SO4, as well as of deuterated and 13C substituted samples are presented and discussed in terms of group theory and the hydrogen bonds present. The main results are that (i) the hydrogen donor strengths of the OH− ions are strongly increased due to the very great synergetic effect of the copper ions, (ii) the acceptor strengths of the H-bond acceptor groups (SO4 2-, CO3 2-, and OH− ions) are significantly modified by the linkage and coordination of the acceptor atoms — this complicates true assignment of the OH bands observed to the two and six different OH− ions present in malachite and brochantite, respectively -, and (iii) the Cu — O stretching modes at 430–590 cm−1 and 420–520 cm−1 for malachite and brochantite, respectively, exhibit strong, partially covalent Cu — O bonding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202247
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  • 8
    Electronic Resource
    Electronic Resource
    Immunitätszüchtung bei Tabak (1934)
    Springer
    Naturwissenschaften 22 (1934), S. 557-559 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01495111
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  • 9
    Electronic Resource
    Electronic Resource
    Structure identification of natural rhamnolipid mixtures by fast atom bombardment tandem mass spectrometry (1993)
    Springer
    Glycoconjugate journal 10 (1993), S. 219-226 
    Details
    ISSN: 1573-4986
    Keywords: fast atom bombardment ; tandem mass spectrometry ; rhamnolipids ; Pseudomonas sp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Two rhamnobiose-lipid preparations have been studied by fast atom bombardment (FAB) tandem mass spectrometry. The principal rhanobiose-lipids contain the β-hydroxydecanoyl-β-hydroxydecanoate Rha-Rha-C10-C10 and the β-hydroxytetradecanoyl-β-hydroxytetradecanoate Rha-Rha-C14-C14. Both preparations contain minor components which are heterogenous in β-hydroxy fatty acid composition. FAB ionization of rhamnobiose-lipids in the presence of Na+ shows the formation of both [M + Na]+, [M + 2Na - H]+, [M + 3Na - 2H]+ and [M - H]− ions. Tandem mass spectrometry of the [M + 2Na - H]+ and [M - H]− ions give information about the sequence of the building blocks. Particularly, heterogeneity in β-hydroxy fatty acid composition is determined for the principal components and all the minor components present in the preparations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00702203
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  • 10
    Electronic Resource
    Electronic Resource
    Adsorption of fish oil and poly(vinylbutyral) onto aluminum oxide particles studied by light scattering (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 1077-1085 
    Details
    ISSN: 1435-1536
    Keywords: Aluminum oxide ; adsorption ; light scattering ; fish oil ; poly(vinylbutyral)
    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 effects of added poly(vinylbutyral) (PVB) and oxidized Menhaden fish oil (O-FO) on dilute suspensions of Al2O3 in the azeotropic solvent mixture 73/27 Wt.-% trichloroethylene/ethanol were studied by static (SLS) and dynamic light-scattering (DLS). The DLS correlation function consisted of four terms from: 1) interdiffusion of the two solvents, 2) diffusion of Al2O3, 3) diffusion of added O-FO and/or PVB, and 4) an induced velocity of particles through the scattering volume due to “laser pressure.” The amplitude and relaxation time of all terms could be determined. Addition of PVB to the Al2O3 suspension resulted in an increase in particle size corresponding to the adsorption of a monolayer of coils. Addition of O-FO to the Al2O3 suspension did not produce a significant increase in particle size, indicating either no adsorption or a compact conformation of O-FO molecules on the Al2O3 surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654114
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