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  • Analytical Chemistry and Spectroscopy  (3)
  • Conference proceedings  (3)
  • (Human)  (2)
  • 1
    Electronic Resource
    Electronic Resource
    A metastable ion study of the electron impact fragmentation of some substituted 2,6-pyrido-containing crown ethers (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1987), S. 633-636 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Extensive networks of metastable ions link the major peaks in the electron impact mass spectra of two crown ethers containing 2,6-pyrido units. High-resolution mass measurements and the metastable peaks allow the elucidation of the fragmentation pathways. The spectra are influenced more by the presence of aromatic substituents than by the 2,6-pyrido units.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210220911
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  • 2
    Electronic Resource
    Electronic Resource
    Induction of aromatase gene expression in human placental choriocarcinoma (JAR) cells by phorbol esters
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Gene Structure and Expression 1218 (1994), S. 48-54 
    Details
    ISSN: 0167-4781
    Keywords: (Human) ; Aromatase ; Aromatase expression ; Phorbol ester
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-4781(94)90099-X
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  • 3
    Electronic Resource
    Electronic Resource
    Hb F-Forest Park, a new ^Aγ variant with two amino acid substitutions, 75(E19)Ile -〉 Thr and 73(E17)Asp -〉 Asn, which can be identified in adults by gene-mapping analysis
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Protein Structure and Molecular 832 (1985), S. 242-247 
    Details
    ISSN: 0167-4838
    Keywords: (Human) ; Amino acid substitution ; Gene mapping ; Hemoglobin variant ; Reverse-phase HPLC
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-4838(85)90256-0
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  • 4
    Electronic Resource
    Electronic Resource
    Small-angle light scattering in dense microemulsions, transition from droplet to bicontinuous phase (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1627-1633 
    Details
    ISSN: 0392-6737
    Keywords: Brillouin and Rayleigh scattering ; Liquids ; Emulsions and suspensions ; Order-disorder and statistical mechanics of model systems ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We have performed extensive small-angle light scattering (SALS) measurements on a three-component microemulsion (AOT/decane/water) as a function of the dispersed phase concentration and the temperature. All samples have a water/AOT molar fractionw=40.8. Such a system presents a very complex phase diagram with many structural configurations. With the SALS technique, we have been able to observe all the phase separation lines. In particular we give details on the system structure on the percolation phenomenon and on the bicontinuous phase recently observed. In particular we show that the percolation is driven by a long-scale aggregation between microemulsion droplets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462051
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  • 5
    Electronic Resource
    Electronic Resource
    Geometry of bicontinuous microemulsions as revealed by SANS and simulations (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1357-1366 
    Details
    ISSN: 0392-6737
    Keywords: Fluid surfaces and fluid-fluid interfaces ; Neutron scattering techniques (including small-angle scattering) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Water-octane-C10E4 microemulsions in both the isotropic and lamellar phases were measured using small-angle neutron scattering. Varying the scattering length density of both the water and oil through hydrogen-deuterium substitution enabled us to isolate the scattering contributions of the surfactant monolayers and the water-surfactant and oil-surfactant interfaces. Analyses of the resulting scattering patterns allow us to directly determine the small mean curvature of the surfactant film as a function of temperature and correlate this quantity with the overall phase behavior. A simulation using a Gaussian random field yields the three-dimensional structure of the bicontinuous microemulsion having a surfactant monolayer with zero mean curvature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462020
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  • 6
    Electronic Resource
    Electronic Resource
    Cluster description of water-in-oil microemulsions near the critical and percolation points (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1419-1431 
    Details
    ISSN: 0392-6737
    Keywords: Phase equilibria, phase transitions, and critical points of specific substances ; Optical properties of bulk materials ; Statistical theory of liquid structure ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The three-component ionic microemulsion system consisting of AOT/water/decane shows an unusual phase behavior in the vicinity of room temperature. The phase diagram in the temperature-volume fraction (of the dispersed phase) plane exhibits a lower consolute critical point at about 40 degrees centigrades and 10% volume fraction. A percolation line, starting from the vicinity of the critical point, cuts across the plane, extending to high volume fraction side at progressively lower temperatures. In this paper we review the evidence that allows to interpret the phase behavior of our system in terms of interacting spherical droplets. We also investigate the dynamics of droplets, below and approaching the critical point by dynamic light scattering. The first cumulant and time evolution of the droplet density correlation function can be quantitatively calculated by assuming the existence of polydispersed fractal clusters formed by the microemulsion droplets due to attraction. The relaxation phenomena observed in an extensive set of measurements of electrical conductivity and permittivity close to percolation is also reviewed and interpreted through the same cluster-forming mechanism, which reproduces the most relevant features of the frequency-dependent complex dielectric constant of this system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462026
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  • 7
    Electronic Resource
    Electronic Resource
    Quantitative analysis of the molecular species of monosialogangliosides by continuous-flow fast-atom bombardment mass spectrometry (1991)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 5 (1991), S. 618-621 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Negative-ion continuous-flow fast-atom bombardment mass spectroemtry was evaluated asa means for the quantitative analysis of N-acetylneuraminyl-galactosyl-glucosyl ceramide (NeuAc-GM3) and N-acetylgalactosaminyl-(N-acetylneuraminyl)galactosyl-glucosyl-ceramide (NeuAc-GM3). This study was carried out on a 7070-EQ mass spectrometer (VG Analytical, Manchester, UK) using a home-made continuous-flow fast-atom bombardment probe with a mixture of methanol +water+triethanolamine (70:27:3, v/v/v)as the mobile phase. Utilizing 100 ng of acetyl-lysogalactosyl-N-acetylgalactosaminyl-(N-acetylneuraminyl)galactosyl-glucosylceramide (acetyl-lysoGM1) as an internal standard curves for NeuAc-GM3 d18:1-16 0, NeuAc-GM3 d18:1-18:0 and Neuac-GM3 d18:1-18:0 were found to be linear over the range 5-250ng, with associated correlation coefficients of 0.990-0.997. The lower limit of detection was found to be 2.5ng. Satisfactory results could also de obtained when the calibration curves were derived from the deprotonated molecular ions of a mixture of the NeuAc-M2 and NeuAc-GM3 classes. Using this approach, quantitative determination of NeuAc-GM3 d18:1-16:0 from rat adrenal gland was performed sing N-acetylneuraminic acid assay as a test control. We found 278±36 ng of this species in 1 mg of tissue (three replicate experiments). The procedure represents a senstive method for the quantitation of mionosialogangliosides and its capability to give molecular species information.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290051210
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  • 8
    Electronic Resource
    Electronic Resource
    Molecular reorientation and vibrational relaxation in dibromomethane (1984)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 15 (1984), S. 152-155 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The polarized and depolarized Raman spectra of the ν2 (CH2 bend) and ν3 (C—Br stretch) vibrations in dibromomethane have been studied as a function of temperature throughout the liquid range. Reorientational correlation times derived from the two modes were simllar in both magnitude and dependence on temperature. This result, together with other structural data, suggests that the rotational dynamics of this molecule in the liquid phase are quasi symmetric-top in character. Vibrational dephasing times calculated from the two lineshapes were also of the same magnitude. However, modulation times determined via the Kubo lineshpae formalism varied markedly between the vibrations. This provides evidence that vibrational dephasing of the bending and stretching modes are influenced by different intermolecular forces in the liquid.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250150304
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