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  • Polymer and Materials Science  (11)
  • Retina  (2)
  • 7.75  (1)
  • Catfish, Kryptopterus bicirrhis (Teleostei)
  • 1990-1994  (5)
  • 1985-1989  (10)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Electron and ion beam induced heating effects in solids measured by laser interferometry (1993)
    Springer
    Applied physics 56 (1993), S. 385-390 
    Details
    ISSN: 1432-0630
    Keywords: 7.75 ; 78.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A sensitive interferometric technique has been applied for studying the thermal displacement of thin film heated by electron or ion beams. The steady state displacement has been measured and we discuss the dependence on material properties and film thickness showing that this method has a potential for in-situ monitoring of thin-film deposition or etching. Transient effects are studied in a thin quartz plate and the propagation velocity of thermal waves is measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324360
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  • 2
    Electronic Resource
    Electronic Resource
    Amacrine cells with neurotensin- and somatostatin-like immunoreactivities in three species of teleosts with different color vision (1987)
    Springer
    Cell & tissue research 248 (1987), S. 663-673 
    Details
    ISSN: 1432-0878
    Keywords: Retina ; Amacrine cells ; Immunocytochemistry ; Neurotensin ; Somatostatin ; Color vision ; Teleosts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Neurotensin- and somatostatin-like immunoreactivities were localized by pre-embedding techniques in retinal whole-mounts and radial sections of a monochromatic glass catfish (Kryptopterus bicirrhis), a dichromatic cichlid species (Aequidens pulcher), and the tetrachromatic roach (Rutilus rutilus). Both neuropeptides were observed in perikarya and processes of amacrine cells. For a precise identification of cell types, tangential and radial views were correlated with Golgiimpregnated material. The dendritic pattern defining the morphological subtype of amacrine cells was determined by the given neuropeptide or by the species-specific degree of complexity of retinal structure and function. Neurotensin-like immunoreactivity was localized in amacrine cells of intermediate size, radial symmetry and dendrites with numerous varicosities; they were monostratified in sublayer 3 of the inner plexiform layer. This cell type was common to all three species. In the mono and dichromatic retinas, a single type of amacrine cell with somatostatinlike immunoreactivity was found with radially oriented, varicose dendrites in sublayer 5. In the tetrachromatic roach retina, two somatostatin-positive amacrine cell types were found with very different patterns of ramification; furthermore, both of these types occurred in more than one sublayer. Possible functional implications for color vision of neuropeptide-specific amacrine cells with uniform morphology in all three species and those with a more varied morphology in the tetrachromatic roach are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00216497
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  • 3
    Electronic Resource
    Electronic Resource
    Amacrine cells in the retina of a cyprinid fish: functional characterization and intracellular labelling with horseradish peroxidase (1989)
    Springer
    Cell & tissue research 256 (1989), S. 607-622 
    Details
    ISSN: 1432-0878
    Keywords: Retina ; Amacrine cells, sustained, transient ; Horseradish peroxidase ; Inner plexiform layer ; Rutilus rutilus (Teleostei)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Forty amacrine cells in retinae of a cyprinid fish, the roach, were intracellularly labelled with horseradish peroxidase following electrophysiological identification as sustained depolarizing, sustained hyperpolarizing or transient units. Labelled cells were analysed by light microscopy and compared with a catalogue of amacrine cells established in a previous Golgi study on the same species. About 30% of the cell types characterized by the Golgi method were encountered in the present study. When intracellularly labelled cells were differentiated on the basis of their dendritic organization in the plane of the retina, a given electrophysiological response pattern was found to be generated by different morphological types, and vice versa. However, examination of the ramification patterns of the dendrites within the inner plexiform layer (i.e. in the radial dimension of the retina), showed that this morphological parameter of a given amacrine cell could be correlated with its light-evoked response. Several amacrine cell types were found to possess special distal dendrites which arose from the main dendritic branches and extended well over a mm in the retina. Distal dendrites were oriented tangentially with respect to the optic nerve papilla, but did not appear to be involved in any synaptic connectivity. It is concluded that the Golgi-based classification is a valuable tool for identifying intracellularly labelled amacrine cells. However, although the correlation between layering of dendrites in the inner plexiform layer and electrophysiology was generally good, additional physiological parameters would be required to determine whether more extensive parallels exist between structural and functional characteristics of amacrine cells. Alternatively, the considerable morphological diversity of amacrine cells may be of limited physiological significance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225611
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  • 4
    Electronic Resource
    Electronic Resource
    Dopaminergic interplexiform cells contact photoreceptor terminals in catfish retina (1990)
    Springer
    Cell & tissue research 261 (1990), S. 359-365 
    Details
    ISSN: 1432-0878
    Keywords: Dopamine ; Interplexiform cell ; Cones ; Rods ; Synapses ; Outer plexiform layer ; Catfish, Kryptopterus bicirrhis (Teleostei)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Dopaminergic interplexiform cells in retinae of glass catfish were investigated using an antiserum against tyrosine hydroxylase and peroxidase-anti-peroxidase (PAP) visualization. In whole-mount preparations, we observed a homogeneous distribution of cell bodies throughout the retina without any indication of regional specializations. At the ultrastructural level, we studied the morphology of labelled telodendria within the outer plexiform layer. Apart from contacts with horizontal cells and bipolar cell dendrites, we report for the first time direct contacts with cone pepdicles and rod spherules. Quantitative evaluation of short series of sections showed that all cone pedicles, and a major part of the rod terminals, were approached in this way. The dopaminergic pathway terminating on photoreceptors is discussed in the context of pharmacological effects of this transmitter in the distal retina during light adaptation, i.e., cone contraction, spinule formation and horizontal cell coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318678
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  • 5
    Electronic Resource
    Electronic Resource
    Viscosity and molecular weight distribution of ultrahigh molecular weight polyethylene using a high temperature low shear rate rotational viscometerThe opinions or assertions about specific products identified by brand name contained herein are the private views of the authors and are not to be construed as conveying either an official endorsement or criticism by the U. S. Department of Commerce, the U. S. Department of Health and Human Services, the National Bureau of Standards, or the Food and Drug Administration. (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 567-582 
    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: To obtain accurate measurements of the limiting viscosity number (LVN) or the intrinsic viscosity [η] of solutions of ultrahigh molecular weight polyethylene (UHMWPE), a low shear floating-rotor viscometer of the Zimm-Crothers type was constructed to measure viscosities at elevated temperatures (135°C) and near zero shear rate. The zero shear rate measurements for UHMWPE whole polymer and UHMWPE fractionated by hydrodynamic crystallization were compared with viscosity measurements at moderate and high shear rates (up to 2000 s-1) carried out in a capillary viscometer. The limiting viscosity number of UHMWPE decreases, as expected, with shear rate. The higher shear rate data could not be extrapolated to yield the correct zero-shear rate viscosities. Fractionation of UHMWPE gave 10 fractions ranging in LVN from 9 to 50 dL/g. A tentative integral molecular weight distribution for the whole polymer was calculated on the basis of the Mark-Houwink equation, but because it had been previously established only for lower molecular weight polyethylenes, it may not be accurate. A correlation was found between the LVNs for the fractions in the two types of viscometers.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070360310
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  • 6
    Electronic Resource
    Electronic Resource
    Stochastic concepts in the study of size effects in the mechanical strength of highly oriented polymeric materials (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 27 (1989), S. 115-149 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A study of size effects in the ultimate mechanical properties of crystalline and semicrystalline polymeric materials (fibers, single crystals) is conducted. The concept of size effect and its importance are discussed. A statistical/stochastic approach is adopted and is shown to yield analytical predictions which are at least as accurate as other modeling schemes (mainly based on fracture mechanics theory) previously proposed in the literature. Within this framework, we propose a possible scheme for simultaneous interpretation of both longitudinal (gauge length) and transversal (diameter) size effects, which provides some interesting information regarding the type of flaw population present in a given polymeric material. The statistical scheme used is based on the Poisson/Weibull model, and variants of it, since this model is relatively well established from both physical and experimental viewpoints. Some unsolved problems inherent to the Weibull/weakest link model for failure are discussed, and a new distribution function for the strength of solids is derived. This is illustrated through an analysis of available experimental data for ultrahigh-molecular-weight polyethylene, poly-p-phenylene terephthalamide (Kevlar), polydiacetylene, and polyoxymethylene. A maximum likelihood approach is used for the first time for interpreting the effect of diameter variability on the mechanical strength of polymeric fibers. We propose a procedure by which the Weibull shape parameter is maximized over a continuous range of values of the size exponent. Finally, we conjecture on the relative roles of defect populations distributed over the boundary and in the bulk.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1989.090270108
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  • 7
    Electronic Resource
    Electronic Resource
    High-density and optical non-linearity effects in epitaxially grown ZnTe layers (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 3 (1994), S. 33-39 
    Details
    ISSN: 1057-9257
    Keywords: High-density luminescence ; Non-linear transmission ; ZnTe ; Metal-organic vapour phase epitaxy ; Inelastic exciton scattering ; Electron-hole plasma ; Pump-and-probe method ; Exciton screening ; Band gap renormalization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: We investigated the high-density luminescence and non-linear transmission of ZnTe layers grown by metal-organic vapour phase epitaxy (MOVPE). For the high-density luminescence we compared ZnTe layers on (001) GaAs substrate with free-standing ZnTe layers of equal thickness. At high excitation intensities a strong luminescence P band appears a few meV below the free exciton energy which is assigned to resonant exciton-scattering processes. A second strong luminescence N band occurs only in free-standing layers. It shows a remarkable red shift with increasing intensity and becomes the dominant emission for an excitation intensity Iexc 〉 1.5 MW cm-2. This lower-energy band was interpreted as electron-hole plasma recombination.The optical non-linearity of thin ZnTe layers in the excitonic region was investigated by pump-and-probe experiments at 2 K and room temperature (RT). For these experiments we used two different pump energies, one above (at 2 K and RT) and one below (at 2 K) the band gap energy. In all cases a red shift and a large non-linear decrease in the excitonic absorption with increasing pump intensity was observed. The experimental results can be explained by many-body effects of exciton screening.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860030106
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  • 8
    Electronic Resource
    Electronic Resource
    49. Analyse eines Beschichtungsverfahrens zur Magnetbandherstellung mit Hilfe der numerischen Simulation (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1078-1078 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330650951
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  • 9
    Electronic Resource
    Electronic Resource
    9. Photokatalytischer Abbau von Abwasserinhaltsstoffen mit Titandioxid und Wasserstoffperoxid (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1050-1051 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330650911
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  • 10
    Electronic Resource
    Electronic Resource
    Errata (1986)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 20 (1986), S. 861-865 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820200617
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