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  • 1
    Electronic Resource
    Electronic Resource
    Morphometric analysis of collagen and elastic fibers in normal skin and gingiva in relation to age (1997)
    Springer
    Clinical oral investigations 1 (1997), S. 147-152 
    Details
    ISSN: 1436-3771
    Keywords: Key words Gingiva ; Skin ; Elastic fibers ; Collagen fibers ; Aging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The morphometric parameters of the human gingival elastic fiber network were determined by image analysis and compared with human skin elastic fibers in relation to age. Similarly, collagen fibers were also investigated in both tissues. In this study, 47 healthy patients, 10 – 75 years old were studied for gingiva and another 50 patients in the same age range were included for skin biopsies. Three groups were compared: group 1 from the age of 10 – 24 years, group 2 from 25 to 49 years, and group 3 from 50 to 75 years. The diameters of the oxytalan fibers were invariable in both tissues, whatever the age considered. On the other hand, the diameters of elastic fibers increased regularly with age in the gingiva (P〈0.01) and in the skin (P〈0.01) between each age group. The area fraction occupied by the oxytalan fibers decreased significantly in both tissues (P〈0.01) for the skin and (P〈0.001) for the gingiva. The area fraction occupied by the gingival elastic fibers remained constant with age while the skin elastic fibers increased significantly with age between groups 2 and 1 (P〈0.01) and between groups 3 and 2 (P〈0.001). In the mid-dermis and in the mid-gingiva, the diameters of the collagen fibers increased strongly with age, between groups 2 and 1 (P〈0.01) and between groups 3 and 2 (P〈0.001). The area fraction occupied by the collagen bundles increased regularly with age in the mid-gingival (P〈0.05 between each age group), while a significant decrease was observed in the mid-dermis from the age of 50 – 75 years (P〈0.05). The results obtained contribute to a better understanding of some modifications which dermis and gingiva undergo with aging and provide data to perfect diagnosis and therapy in odontology and dermatology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007840050026
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  • 2
    Electronic Resource
    Electronic Resource
    Polychlorinated polyamides. II. Synthesis and characterization of polyamides derived from 2, 5-dichloroterephthaloyl dichloride and perchloroterephthaloyl dichloride (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 2181-2191 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New thermally stable polyamides were prepared by interfacial polymerization of the title compounds and various aliphatic and aromatic diamines. The polymers were characterized by infrared spectrometry, elemental analysis, and differential scanning calorimetry. The molecular weights of the polymers were estimated by viscosity measurements. The influence of the halogen content on the thermal properties and degree of polymerization of the polymers was studied. One of the polyamides was fractionated to determine the degree of polydispersity.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.170170726
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  • 3
    Electronic Resource
    Electronic Resource
    Organoboron compounds as durable flame retardants for cotton fabric (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 2523-2532 
    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: Twenty-five organoboron compounds were evaluated for their ability to impart flame retardancy properties to a cotton twill fabric. Only those organoboron compounds in which the carbon-to-boron atom ratio was 4 or less imparted flame retardancy at an approximate 20% add-on level; if a halogen atom was also present in the molecule this ratio could be higher than 4. Washfast finishes with six different compounds were developed by either γ-radiation grafting of a vinyl organoboron compound or by chemical curing with hexamethylenediisocyanate, trimethylolmelamine or urea-formaldehyde.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170818
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  • 4
    Electronic Resource
    Electronic Resource
    Treatment for improving flame retardancy of wool and minimizing toxic gas evolution in burning (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 1009-1016 
    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: A treatment involving formaldehyde, a reducing agent, and a boron-containing compound of a wool shag carpet imparted to it a flame-retardancy effect that was effective after the seventh but not the eighth shampoo. This treatment also decreased the concentration of carbon monoxide and hydrocyanic acid generated in the products of combustion by at least a factor of 2. Analogous treatment of a wool flannel fabric produced a 15-22% sample area shrinkage and imparted a flame-retardancy effect that was still effective after a 2-hr cold water rinse.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1972.070160419
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  • 5
    Electronic Resource
    Electronic Resource
    Studies of polypeptide structure by fluorescence techniques. III. Interaction between dye and macromolecule in fluorescent conjugates (1967)
    New York : Wiley-Blackwell
    Biopolymers 5 (1967), S. 297-311 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The effects of pH on the polarization of fluorescence of dyes dissolved in media of high viscosity or conjugated to polypeptides that undergo no structural transitions indicate that DNS is useful for studying pH-dependent molecular transition over the range pH 2.5-14, whereas fluorescein is useful only over the range pH 6-8. Heating and cooling in aqueous solutions cause no change in the polarization of fluorescein or of DNS; therefore, the dyes themselves do not introduce artifacts into heating studies of the dye conjugates. The interaction between fluorescein or DNS and the molecule to which it is conjugated varies and thus may affect the measurements made with the conjugates: the rotational relaxation times of polylysine, of a copolymer of glutamic acid and lysine, and of lysozyme are approximately twice as long when measured with DNS-conjugates as when measured with fluorescein-conjugates. The explanation for this observation is postulated to lie in the tighter binding between fluorescein and the molecule to which it is conjugated, presumably around the point of its covalent attachment, which makes it a better indicator of the behavior of the rotational kinetic unit of the polypeptide chain. The stronger binding of fluorescein is inferred from two lines of evidence: (1) the fluorescent intensity and ultraviolet spectra of a fluorescein-polylysine conjugate are less susceptible to changes in solvent than those of the DNS conjugate, and (2) the net charge of the polypeptide affects the ionization of fluorescein much less than it affects the ionization of DNS. Additional evidence from previous studies corroborates this conclusion. Thus, it is important to establish the relationship between the fluorescent dye and the molecule to which it is conjugated before using the fluorescence data to calculate rotational relaxation times and other molecular parameters.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1967.360050307
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