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  • 1
    ISSN: 1432-234X
    Keywords: Ultrastructure ; Gills ; Epithelial cells ; Polychaeta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ultrastructure of gill epidermal cells of Diopatra neapolitana and their relationship with blood spaces are described. The existence of a basal infolding complex, related to the blood spaces, is also reported. A possible involvement of these cells in osmoregulation and ion interchange, apart from their well-known role in respiration, is suggested.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1615-6102
    Keywords: Silver staining ; Nucleolus ; Quantitative analysis ; Pineal gland ; Rat ; Oestrous cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Morphology, distribution and number of different argyrophilic aggregates appearing in pinealocyte nuclei have been studied during the rat oestrous cycle. Using the Ag-NOR reaction we have found two types of argyrophilic aggregates in pinealocyte nuclei. One of them, corresponding to the fibrillar centres and the surrounding fibrillar component, appears in the nucleoli. The silver grains are more loosely packed in the dense fibrillar component than in the fibrillar centres. A decrease in the number of these nucleolar argyrophilic aggregates was obtained at oestrous. A second type of silver grain aggregate was observed in the pinealocyte nucleoplasm. We call them “Ag-granule clusters” because they are similar to the interchromatin granule clusters and constitute the only silver deposit forming aggregates apart from the nucleolus. The number of Ag-granule clusters is significantly smaller at oestrous and meta-oestrous than at dioestrous and pro-oestrous.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 491-496 
    ISSN: 1040-0397
    Keywords: Iproniazid ; Differential pulse polarography ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Iproniazid was found to be irreversibiy reduced in two steps, involving the exchange of two electrons and two protons each, by using tast polarography, normal pulse polarography (NPP), and cyclic voltammetry (CV). The rate constants of these two steps were found to be 5.8 × 10-6 and 4.2 × 10-6 and 4.2 × 10-6 cm s-1, respectively, and their corresponding diffusion coefficients 4.5 × 10-5 and 8.3 × 10-5 cm2 s-1, Also, α, the coefficient of cathodic transfer, was found to be 0.20 to 0.25 for the first peak and 0.17 to 0.15 for the second. On the basis of the electrochemical study performed, a differential pulse polarographic method for the determination of iproniazid over the concentration range of 5 × 10-7 M to 1 × 10-4 M was developed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 43 (1998), S. 69-76 
    ISSN: 0021-9304
    Keywords: calcium phosphate coatings ; pulsed laser deposition ; heat treatment ; recrystallization ; structural analysis ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Amorphous calcium phosphate coatings were produced by pulsed laser deposition from targets of nonstoichiometric hydroxyapatite (Ca/P = 1.70) at a low substrate temperature of 300 °C. They were heated in air at different temperatures: 300, 450, 525 and 650 °C. Chemical and structural analyses of these coatings were performed using X-ray diffraction (XRD), FTIR, and SEM. XRD analysis of the as-deposited and heated coatings revealed that their crystallinity improved as heat treatment temperature increased. The main phase was apatitic, with some β-tricalcium phosphate in the coatings heated at 525 and 600 °C. In the apatitic phase there was some carbonate substitution for phosphate and hydroxyl ions at 450 °C and almost solely for phosphate at 525 and 600 °C as identified by FTIR. This was accompanied by a higher hydroxyl content at 525 and 600 °C. At 450 °C a texture on the coating surface was observable by SEM that was attributable to a calcium hydroxide and calcite formation by XRD. These phases almost disappeared at 600 °C, probably due to a transformation into calcium oxide. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 43: 69-76, 1998
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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