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  • 1
    Electronic Resource
    Electronic Resource
    The identification of biologically important thiols (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 15 (1988), S. 123-128 
    Details
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new mass spectral method has been developed and used to identify biologically important thiols. This method is based upon the use of C-14 labeled N-para-bromophenylmaleimide (BPM) to selectively derivatize thiols. The isotopic label facilitates the isolation and purification of trace quantities of the maleimide thiol adducts by high performance liquid chromatography (HPLC) with radioactivity detection. The use of the bromine atom in the thiol derivative greatly enhances the detectability of the parent and fragment ions containing the BPM moiety because of the generation of the characteristic N + 2 doublet ions. Several examples of the use of this method to identify non-volatile thiol peptides such as glutathione (GSH) and homoglutathione (hGSH) by fast atom bombardment mass spectrometry (FAB-MS) are described in this report.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200150302
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  • 2
    Electronic Resource
    Electronic Resource
    The mechanism of sensory transduction in the sensilla of the trochanteral hair plate of the cockroach, Periplaneta americana (1979)
    Springer
    Cell & tissue research 198 (1979), S. 159-174 
    Details
    ISSN: 1432-0878
    Keywords: Neurobiology ; Neuroanatomy ; Mechanoreceptors ; Hair plate ; Sense organs ; Sensory transduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The trochanteral hair plate of the cockroach leg contains approximately 60 hair sensilla that are deflected by a joint membrane during flexion of the leg. Previous work has shown that the organ is a mechanoreceptor which limits leg flexion during walking by reflex connections to flexor and extensor motoneurons. Functional analysis of the largest sensilla has shown that their behaviour may be well approximated by a velocity detector followed by a unidirectional rectifier. We report here the results of an examination of the largest sensilla by scanning and transmission electron microscopy in an attempt to correlate the structure with the known functional elements. Each hair is innervated by a single sensory dendrite which is surrounded by an electron dense dendritic sheath. The dendrite terminates below the hair shaft in a tubular body containing a parallel array of microtubules embedded in an electron dense matrix, while the dendritic sheath extends beyond the tubular body to form the walls of the ecdysial canal. At the proximal end of the tubular body the dendritic sheath and sensory dendrite are anchored to the cuticular socket by a fibrous dome which seems to form a fulcrum around which the tubular body can be deflected by movements of the hair. We suggest that the basis for the detection of velocity may be mechanical differentiation by a fluid space between the dendritic sheath and the tubular body. The structure is also discussed with relation to the mechanism of sensory transduction and the possible causes of the unidirectional sensitivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234843
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  • 3
    Electronic Resource
    Electronic Resource
    The mechanosensory apparatus of the femoral tactile spine of the cockroach, Periplaneta americana (1981)
    Springer
    Cell & tissue research 219 (1981), S. 53-68 
    Details
    ISSN: 1432-0878
    Keywords: Neurobiology ; Mechanoreceptor ; Sensory transduction ; Cockroach, Periplaneta americana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Tactile spines are large cuticular sense organs that appear to provide insects with a sense of touch which is spatially coarse but of great sensitivity. Cockroach legs have a number of these spines on each leg and a particularly prominent spine on the end of each femur, the femoral tactile spine. The ease of recording afferent activity from this spine during mechanical stimulation has made it one of the most thoroughly studied insect mechanoreceptors and yet it has never been examined by electron microscopy. We report here the results of an examination of the femoral tactile spine by both scanning and transmission electron microscopy, as well as by light microscopy. The spine is shown to be innervated by a single sensory bipolar neuron with its soma located in the base of the spine. A canal through the wall of the spine leads to the outside and emerges just above the junction between the base of the spine and its articulating socket membrane. The sensory dendrite of the neuron passes from the soma through this canal and forms a modified ciliary sensory ending with the typical dendritic sheath and dense tubular body that is characteristic of insect mechanosensory cuticular sensilla. The tubular body is embedded in a cuticular terminal plug which closes the exterior end of the canal but appears to be fastened to the spine by a very flexible ring of cuticle. This plug is connected to the socket membrane by a specialized socket attachment which presumably serves to move the plug relative to the wall of the spine during movement of the spine within the socket. The morphology of this sensillum is discussed in terms of the possible ways in which it is stimulated by movements of the spine and also in light of the dynamic behaviour of the receptor which is now very well described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00210018
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  • 4
    Electronic Resource
    Electronic Resource
    Sorption of CO2, C2H4, N2O and their binary mixtures in poly(methyl methacrylate) (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 175-188 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Sorption of carbon dioxide, ethylene, and nitrous oxide in poly(methyl methacrylate) (PMMA) at 35°C has been characterized for each gas as a pure component and for mixtures of carbon dioxide/ethylene and carbon dioxide/nitrous oxide. Pressures up to 20 atm were examined. Pure-component sorption isotherms are concave to the pressure axis for each of the gases. This behavior is accurately described by the dual-mode sorption model. Using only the purecomponent dual-mode parameters and the generalization of the model for gas mixtures, one can predict the total concentration of gas sorbed in the polymer to within an average deviation of ±2.01% for the CO2/C2H4/PMMA system and ±0.98% for the CO2/N2O/PMMA system. In both systems, for each component of the mixture, sorption levels were lower than corresponding pure-component sorption levels at pressures equal to the partial pressure of the respective components in the mixture. Depression of the sorbed concentration in mixture situations appears to be a general feature of the above systems and can be substantial in some situations. For the CO2/C2H4/PMMA system, use of pure-component sorption data to estimate the total sorbed concentration in the mixture would be in error by as much as 40% if one failed to account for competition phenomena responsible for depression in mixed-gas situations. Mixture pressures as high as 20 atm were studied for both systems and in the CO2/N2O/PMMA system sorbed concentrations reach 33.90 [cm3(STP)/cm3 polymer] without any significant deviation from model predictions.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.180240117
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  • 5
    Electronic Resource
    Electronic Resource
    Relative solubility of tetrachlorohexafluorobisphenol-A polycarbonate in various compounds (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 47 (1993), S. 2161-2167 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The relative solubility of tetrachlorohexafluorobisphenol-A polycarbonate was observed in 127 organic compounds comprising 14 different chemical classes at room temperature and up to about 225°C. The polymer is soluble in numerous esters, ketones, halocarbons, heterocyclics, and amides. It is poorly soluble in alcohols and fluorocarbons. Correlation of observed solubility with Hildebrand total solubility parameters was poor; a much better correlation was observed with Hansen three-dimensional parameters. The solubility parameter of the polymer was estimated to be 9.1 (cal/cm3)1/2 (18.7 MPa1/2) from the averages of the Hansen parameters for 26 experimentally identified solvents. © 1993 John Wiley & Sons, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070471210
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