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  • 1
    Electronic Resource
    Electronic Resource
    Immunotype findings in macrophages in aural cholesteatomas (1992)
    Springer
    European archives of oto-rhino-laryngology and head & neck 249 (1992), S. 87-90 
    Details
    ISSN: 1434-4726
    Keywords: Cholesteatomas ; Macrophages ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Since a heavy cellular infiltrate is seen in the stroma of most aural cholesteatomas, we attempted to characterize this cell population in more detail using monocyte/macrophage-specific monoclonal antibodies. KiM1+ (specific for CD 11c antigen, the 150kDa α-chain of a leukocyte integrin), and KiM6+ phagocytes were present in two- or fourfold higher numbers in the stroma of the six excised cholesteatomas than in the control tissues. Since the stroma of the cholesteatoma is devoid of microvessles, the typical perivascular localization of dermal macrophages was not seen in the cholesteatomas studied. The density of the macrophages in the normal ear skin was much higher in the upper dermis than in the lower dermis. In the cholesteatomatous specimens, the phagocytes were evenly scattered within the connective tissue and the cellular infiltrate. In contrast to diseased skin, no Mac 387+ macrophages were detected in the cholesteatomas. A great number of phagocytic cells closely resembling dermal macrophages was found in the stroma of the cholesteatomas and probably contributes to an active autoimmune process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00186453
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  • 2
    Electronic Resource
    Electronic Resource
    Chemical agents that inhibit pollen development: effects of the phenyl-cinnoline carboxylates SC-1058 and SC-1271 on the ultrastructure of developing wheat anthers (Triticum aestivum L. var Yecora rojò) (1993)
    Springer
    Sexual plant reproduction 6 (1993), S. 108-212 
    Details
    ISSN: 1432-2145
    Keywords: Wheat pollen ; Chemical hybridizing agents ; Male sterility ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Phenylcinnoline carboxylate compounds SC-1058 and SC-1271 cause complete male sterility in wheat when applied at suitable dosages at the pre-meiotic stage of anther development. Anthers from treated and untreated plants were compared using light and electron microscopy from the pre-meiotic stage through the formation of nearly mature pollen. Overall anther development is gradually slowed in treated plants and pollen development is generally arrested in the late prevacuolate or early vacuolate microspore stage, although the first pollen mitosis does sometimes occur. The sporopollenin-containing exine walls are thinner, and show abnormally developed foot and tectum layers with sparse connecting baculi. Microspore cytoplasm degenerates and the cells eventually collapse. At the early, prevacuolate, free microspore stage treated tapetal cells hypertrophy, expanding into the locule. They contain abnormally large vacuoles that appear to form from the fusion of secretory vesicles, and some vacuoles contain electrondense deposits. The sporopollenin-containing orbicular wall and Ubisch bodies are retarded in their development and are structurally deformed. Acetolysis of whole anthers and of thick sections shows that the sporopollen-in-containing structures of treated materials are greatly reduced in thickness and are less rigid than in the control. We conclude that application of these compounds causes interference with the secretory function of tapetal cells which supplies sporopollenin cell-wall polymers to the exine of the microspores and to the tapetal orbicular wall and associated Ubisch bodies. Interference with the tapetal secretion of other nutrients required for microspore development is strongly suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227655
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  • 3
    Electronic Resource
    Electronic Resource
    Sodium hexadecanoate micellar aggregation number (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 1259-1263 
    Details
    ISSN: 1435-1536
    Keywords: Sodium hexadecanoate ; Rodlike micelles ; Diffusion Coefficients ; Polarography ; Micelle size
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The diffusion coefficient of sodium hexadecanoate micelles was studied by polarography at 63°C, and the size and aggregation number of the micelles was computed. At concentrations above 0.01 mol·L−1 rodlike micelles exist, which become flexible at 0.040 mol·L−1 and entangle at 0.043 mol·L−1
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657779
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  • 4
    Electronic Resource
    Electronic Resource
    Distribution of emulsified monomers with different water solubility (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 778-785 
    Details
    ISSN: 1435-1536
    Keywords: Monomersdistribution ; micellarphase ; emulsioncopolymerization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The location and distribution of acrylic acid and styrene in emulsions made with a cationic surfactant, cetyltrimethylammonium bromide (CTAB), or an anionic surfactant, sodium dodecylsulfate (SDS), were determined with ultra-violet spectroscopy, conductivity, and potentiometry. In these systems, the acrylic acid remains in the aqueous phase near the micelle surface, whereas the styrene is located in the micelles or in emulsified droplets. In the absence of acrylic acid, some of the styrene is solubilized in the micelle interior and some is adsorbed at the micelle inner surface. Upon addition of acrylic acid, all the styrene is displaced to the center of the micelles. The interaction between acrylic acid and CTAB micelles is stronger than that between acrylic acid and SDS micelles. With CTAB, acrylic acid is adsorbed at the micelle surface, whereas with SDS, acrylic acid remains in the intermicellar solution. These differences can account for the differences reported in the emulsion copolymerization of acrylic acid and styrene using CTAB or SDS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411110
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  • 5
    Electronic Resource
    Electronic Resource
    Anwendung von Methoden der Mustererkennung bei mikrobiell hergestellten Trockenproduktchargen (1990)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 10 (1990), S. 253-260 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The application of methods of Pattern Recognition makes it possible to classify dehydrated SCP-products which were produced under various conditions of production by a low number of signs. These mathematical methods not only allow to draw technological conclusions but also to decide on correctness of the way to produce suitable SCP-products for feeding of monogastric animal species. There are a large number of possibilities to use these methods of Pattern Recognition in the field of biotechnological research.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370100308
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of emulsifier type on the copolymerization of styrene and acrylic acid (1991)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 31 (1991), S. 404-409 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: In this work we report the emulsion copolymerization of styrene and acrylic acid using a cationic (cetyltrimethylammonium bromide or CTAB) or an anionic (sodium dodecylsulfate or SDS) emulsifier. Latexes were stable and monodisperse with spherical particles of ∼100 nm for the CTAB latex and of ∼70 nm for the SDS latex. However, a random copolymer was produced with CTAB whereas a “blocky” copolymer was obtained with SDS. Here we propose a mechanism to explain these structural differences in terms of the relative reactivities of styrene and acrylic acid and of their initial location and distribution in the SDS and CTAB emulsions.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760310604
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