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  • Analytical Chemistry and Spectroscopy  (14)
  • ion selectivity  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The characterization of a monovalent cation-selective channel of mammalian cardiac muscle sarcoplasmic reticulum (1984)
    Springer
    The journal of membrane biology 80 (1984), S. 191-199 
    Details
    ISSN: 1432-1424
    Keywords: cardiac sarcoplasmic reticulum ; K+ channel ; ion selectivity ; decamethonium block
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Rabbit cardiac muscle sarcoplasmic reticulum (SR) was isolated and separated into ryanodine-sensitive and-insensitive fractions (L.R. Jones and S.E. Cala,J. Biol. Chem. 256:11809–11818, 1981). Vesicles of cardiac SR were incorporated into planar phospholipid bilayers by fusion and the channel activity of the membrane studied under voltage-clamp conditions (C. Miller,J. Membrane Biol. 40: 1–23, 1978). Both fractions contain a monovalent cation-selective three-state channel. In the presence of 75mm K2SO4, the fully open state (β) conductance of this channel is 157.2±30 pS and the sub-state (α) conductance is 100.7±21 pS. Both open states display the same selectivity sequence for monovalent cations, i.e. K+〉NH 4 + 〉Rb+〉Na+〉Li+ and may be blocked by the skeletal muscle relaxants decamethonium and hexamethonium. Block occurs when the compounds are added to either side of the membrane. The properties of the cardiac SR cation channel are compared with those of the previously reported monovalent cation-selective channels of mammalian and amphibian skeletal muscle SR.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01868775
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  • 2
    Electronic Resource
    Electronic Resource
    Conduction and blocking properties of a predominantly anion-selective channel from human platelet surface membrane reconstituted into planar phospholipid bilayers (1989)
    Springer
    The journal of membrane biology 109 (1989), S. 113-122 
    Details
    ISSN: 1432-1424
    Keywords: platelet surface membrane ; lipid bilayer ; anion channel ; ion selectivity ; block
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary We have investigated the basic properties of a predominantly anion-selective channel derived from highly purified human platelet surface membrane. Single channels have been reconstituted into planar phospholipid bilayers by fusion of membrane vesicles and recorded under voltage-clamp conditions. The channel is found to have the following properties: (i) Channel activity occurs in bursts of openings separated by long closed periods. (ii) The current-voltage relationship is nonlinear. Channel current is seen to rectify, with less current flowing at positive than at negative voltages. Rectification may be due to asymmetric block by HEPES/Tris buffers. In 450mm KCl, 5mm HEPES/Tris, pH 7.2 the single channel conductance at −40 mV is ∼160 pS and at +40 mV is ∼90 pS. (iii) The conductanceconcentration relationship follows a simple saturation curve. Half maximal conductance is achieved at a concentration of ∼1000mm KCl, and the curve saturates at a conductance of ∼500 pS. (iv) Reversal potentials interpreted in terms of the Goldman-Hodgkin-Katz equation indicate a Cl∶K permeability ratio of 4∶1. (v) The channel accepts all of the halides as well as a number of other anions. The following sequence of relative anion permeabilities (in the presence of K+) is obtained: F−〈acetate−〈gluconate−〈Cl−〈Br−〈I−〈NO 3 − 〈SCN−. (vi) Cations as large as TEA+ are permeant. (vii) Current through the channel is blocked in the presence of DIDS, SITS and ATP, but not by Zn2+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01870850
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  • 3
    Electronic Resource
    Electronic Resource
    Gas chromatographic analysis of furaneol (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 421-422 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; Unstable flavor compound ; Comparison of fused silica, glass, and metal columns ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040815
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of robust tapered restrictors for capillary supercritical fluid chromatography (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 289-291 
    Details
    ISSN: 0935-6304
    Keywords: Supercritical fluid chromatography, SFC ; Capillary columns ; Restrictor ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240110314
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  • 5
    Electronic Resource
    Electronic Resource
    Supercritical fluid extraction / capillary supercritical fluid chromatography / Fourier transform infrared microspectrometry of polycyclic aromatic compounds in a coal tar pitch (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 766-775 
    Details
    ISSN: 0935-6304
    Keywords: Supercritical fluid extraction, SFE ; Supercritical fluid chromatography, SFC ; Fourier transform infrared microspectrometry, FTIR ; Narrow-bore capillary column ; Polycyclic aromatic compounds, PAC ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The combination of supercritical fluid extraction, high resolution capillary supercritical fluid chromatography, and Fourier transform infrared microspectrometry is described for the separation and identification of polycyclic aromatic hydrocarbons in a coal tar pitch. The variable solvating power of the supercritical fluid was utilized to selectively fractionate the sample. The fluid extract was decompressed through a frit restrictor into the sample cavity of a cooled microvalve injector, where the analytes were deposited and concentrated for subsequent chromatographic analysis. Several of the analytes separated in the chromatograph were collected on a potassium bromide disc at a solvent elimination inter-face for subsequent infrared analysis involving the use of an infra-red microscope accessory. The spectra obtained show the power of this detection technique for distinguishing between isomers.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240111105
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  • 6
    Electronic Resource
    Electronic Resource
    Dissociation of meta-stable ions in mass spectrometers with release of internal energy (1995)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 793-796 
    Details
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Certain of the “meta-stable peaks” in mass spectra are abnormally wide. This extra width is shown to be associated with release of kinetic energy during fragmentation. Methods are presented for measuring this energy release and values are given for various transitions in the spectra of aromatic nitro compounds.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jms.1190300603
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  • 7
    Electronic Resource
    Electronic Resource
    Palaeodental studies using FT-Raman spectroscopy (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 1 (1995), S. 29-36 
    Details
    ISSN: 1075-4261
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: The FT-Raman vibrational spectrum of a child's deciduous exfoliated tooth has been analysed and the spectral features assigned to hydroxyapatite and protein. Comparisons made with older teeth from a Romano-British burial site (∼ 2k years) and fossilised animal teeth (∼ 1 M-70 M years) indicate that the organic protein component has disappeared with interment, whereas spectroscopic features due to the inorganic phosphatic matrix are common to all samples, modern and ancient. The application of the technique to the non-destructive analysis of archaeological samples and the recording of spectra from interred samples without detriment from fluorescent material is demonstrated. © 1995 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bspy.350010105
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  • 8
    Electronic Resource
    Electronic Resource
    The mass spectra of some guanidines (1968)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 169-187 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of guanidine and ten of its derivatives have been studied under both high and low resolution conditions. Evidence was detected for the migration of methyl groups, the formation of intermediate three-membered ring structures and decompositions involving expulsion of N. with release of kinetic energy.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210010116
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  • 9
    Electronic Resource
    Electronic Resource
    ‘Doubly charged ion’ mass spectra of some simple aromatic compounds (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 303-310 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Benzene, toluene, phenol, diphenyl ether and the three isomeric dihydroxy-benzenes have been examined using an MS-9 mass spectrometer under conditions that allowed only ions having twice the normal amount of kinetic energy to be detected. These ions are, in fact, singly charged ions arising from charge exchange reactions of doubly charged ions of the same mass, occuring in the first field free region of the Spectrometer. It is argued that the spectra obtained yield essentially the distribution of doubly charged ions in the source region. These ‘doubly charged ion’ mass spectra are compared with the normal singly charged ion spectra of the compounds and the implications of the significant differences that are found, are discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050308
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  • 10
    Electronic Resource
    Electronic Resource
    My years with John (1947-73) (1983)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 18 (1983), S. 506-508 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210181203
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