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  • Chemistry  (62)
  • Iris
  • Life Sciences
  • Ureter
  • 1985-1989  (47)
  • 1970-1974  (20)
  • 1
    Electronic Resource
    Electronic Resource
    Properties of membranes from polyelectrolyte complexes consisting of methyl glycol chitosan, [2-(diethylamino)ethyl]dextran, and poly(potassium vinyl sulfate) (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 2631-2642 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Water-insoluble polyelectrolyte complexes (PEC) were prepared by mixing methyl glycol chitosan (MGC, 1) and [2-(diethylamino)ethyl]dextran (EA, 2) with poly(potassium vinyl sulfate) (PVSK, 3) in aqueous solution at various hydrogen ion concentrations. Elemental analyses, IR spectroscopy, and solubilities of PEC reveal that PEC differ in molecular structure and properties according to pH. It seems that the degree of dissociation and the conformation of MGC, EA, and PVSK change with pH. PEC membranes were made by casting from solutions of all kinds of PEC, and transport phenomena through the membrane of PEC prepared in 4 wt.-% HCl solution were investigated under various conditions. The driving force of the transport depends on the membrance potential, Donnan potential, and diffusion potential, according to measurements of the transport ratio of Na+ and the electric potential difference between the left- and right-hand side of the membrane. Moreover, the permeability of K+ is higher than that of Na+.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021881114
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  • 2
    Electronic Resource
    Electronic Resource
    Degeneration and regeneration of smooth muscle transplants in the anterior eye chamber (1971)
    Springer
    Cell & tissue research 117 (1971), S. 155-175 
    Details
    ISSN: 1432-0878
    Keywords: Smooth Muscle Transplants ; Vas deferens ; Bladder ; Ureter ; Wound healing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Smooth muscle from small segments of the vas deferens, urinary bladder and the ureter of the guinea pig was transplanted into the anterior chamber of the eye. Some muscle cells had a normal appearance, but others showed morphological changes during the first few days following transplantation. Changes of two main kinds were observed: some cells contained aggregations of glycogen granules and lipid droplets; other cells were characterized by either a general increase in electron density of the cell with the presence of very thick filaments (which are, possibly, aggregates of thin filaments), or cells containing an electron-dense nucleus, ruptured cellular membranous systems and degenerating mitochondria. Following revascularisation, which commenced one to two days after transplantation, areas containing cells with an appearance similar to that of embryonic smooth muscle were apparent. Evidence of mitosis of smooth-muscle and other cell types was also noted, the most active period being five to ten days after transplantation. Bundles containing normal muscle cells were apparent by four weeks in these transplants. However, whole undissected transplants contained normal-looking muscle bundles after one week. These findings are discussed in relation to the repair of wounds to smooth muscle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330735
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  • 3
    Electronic Resource
    Electronic Resource
    Lanthanum nitrate in a smooth muscle membrane system (1974)
    Springer
    Cell & tissue research 147 (1974), S. 157-161 
    Details
    ISSN: 1432-0878
    Keywords: Smooth muscle ; Iris ; Lanthanum nitrate ; Sarcoplasmic reticulum ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Smooth muscle cells of the guinea-pig sphincter pupillae were fixed in the presence of 3% lanthanum nitrate. Although only small amounts of lanthanum were found in plasmalemmal vesicles, large deposits were present within a membrane system resembling sarcoplasmic reticulum. The significance of these findings is discussed in relation to the use of lanthanum nitrate as an extracellular tracer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00582790
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  • 4
    Electronic Resource
    Electronic Resource
    Formation of fenestrated capillaries in mammalian vas deferens and ureter transplants (1972)
    Springer
    Cell & tissue research 134 (1972), S. 167-173 
    Details
    ISSN: 1432-0878
    Keywords: Fenestrated capillaries ; Transplantation ; Vas deferens ; Ureter ; Electronmicroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary This paper discusses the possibility that fenestrated capillaries may be induced by the presence or action of epithelial cells. Fenestrations were shown to exist in a number of capillaries in close proximity to the epithelium in the in situ guinea-pig vas deferens and ureter. These results suggest further roles for the vas deferens and ureter than those previously conceived. Transplants of these tissues in the anterior eye chamber were, by two weeks, highly vascularized. Those transplants containing epithelium showed fenestrated capillaries in close proximity to these cells. However, in transplants which did not contain epithelial cells, no fenestrations were noted in capillaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307150
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  • 5
    Electronic Resource
    Electronic Resource
    Immunohistochemical localization of S-100 protein in the retina, ciliary body and iris of human fetuses (1985)
    Springer
    Cell & tissue research 239 (1985), S. 505-510 
    Details
    ISSN: 1432-0878
    Keywords: S-100 protein ; Immunohistochemistry ; Retina ; Ciliary body ; Iris ; Human fetus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The present study deals with the localization and development of S-100 protein-like immunoreactivity in the retina, ciliary body and iris of human fetuses. In the retina, numerous astrocytes, densely distributed in the nerve-fiber layer and ganglion-cell layer, were stained strongly with the S-100 antiserum. The first immunoreactive astrocytes occurred at the posterior pole of the retina and spread gradually outward and toward the ora serrata with increasing age. Müller cells were not immunoreactive for S-100 during development, except in the retina of the latest fetus examined. S-100 immunoreactivity was also found in the nonpigmented ciliary epithelium and posterior epithelium of the iris, both of which are developed from the inner wall of the optic cup. On the other hand, the pigmented epithelium extending from retina to iris, derived from the outer layer of the optic cup, was free of S-100 immunoreactivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219228
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  • 6
    Electronic Resource
    Electronic Resource
    Charge-Transfer-Komplexe von Metalldithiolenen mit Viologenen (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1011-1016 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Charge transfer complexes of the type [ML2]2-[RV]2+ are prepared from viologens (RV2+) and dianionic metal dithiolenes ([ML2]2-; M=Zn, Cd, Hg; L=a substituted 1,2-ethenedithiolate). The solid state structure consists of separated pseudocolumns of tetrahedral metal dithiolenes and twisted viologens. While there is no evidence for short contacts within a column, an intercolumnar interaction is indicated by Zn-H and S-H distances of 3.27 and 2.87 Å, respectively. UV-VIS spectra exhibit an ion pair charge transfer band in the range of 460-660 nm (∊=400-1900). Its location is predominatly determined by the nature of the ethenedithiolate ligand inducing shifts of 70-200 nm while the metal has only a weak influence. Formation constants of the 1:1 ion pairs are in the range of 100-600 1 mol-1. Spectrophotometric analysis reveals the presence of further adducts with different composition.
    Notes: Charge-Transfer-Komplexe des Typs [ML2]2-[RV]2+ werden aus Viologenen (RV2+) und dianionischen Metalldithiolenen ([ML2]2-; M=Zn, Cd, Hg; L=ein substituiertes 1,2-Ethendithiolat) synthetisiert. Die Festkörperstruktur besteht aus getrennten Pseudosäulen tetraedrischer Metalldithiolene und verdrillter Viologene. Für intrakolumnare Wechselwirkungen gibt es keine Hinweise, für interkolumnare sprechen dagegen die kurzen Zn-H- und S-H-Abstände von 3.27 und 2.87 Å. UV-VIS-Spektren enthalten eine Ionenpaar-Charge-Transfer-Bande im Bereich von 460-660 nm (∊=400-1900). Deren Lage wird hauptsächlich durch die Natur des Ethendithiolat-Liganden festgelegt, welcher Verschiebungen von 70-200 nm induziert. Das Zentralmetall übt nur einen schwachen Einfluß aus. Die Bildungskonstanten der 1:1-Ionenpaare liegen im Bereich von 100-600 1 mol-1. Spektrophotometrische Analysen deuten auf das Vorliegen weiterer Ionenassoziate unterschiedlicher Zusammensetzung.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200621
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of glass transition on catalytic activity of polymer-anchored rhodium complexes (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 1085-1093 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A rhodium complex was anchored upon three types of phosphinated polystyrene which were crosslinked with divinylbenzene or ethylene dimethacrylate. Glass transitions were separately observed for the flexible polymer supports and their polymer-anchored rhodium complex catalysts using differential scanning calorimetry. Discontinuous activity drops in the Arrhenius plot for the ethylene hydrogenation reaction were observed for these flexibe polymer catalysts, while, for the rhodium complex anchored on a highly crosslinked rigid polymer, neither glass transition nor such a discontinuity in the catalytic activity could be detected. This reversible activity drop is discussed in terms of changes in the stability and the coordination state of the ethylene complex influenced by the micro-Brownian motion of the polymer network.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021880513
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  • 8
    Electronic Resource
    Electronic Resource
    Novel synthetic approach to poly(p-benzenesulfonamide): Self-polycondensation of active p-aminobenzenesulfonic acid derivatives under mild conditions (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 2839-2846 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Three active p-aminobenzenesulfonic acid derivatives, 1-(p-aminobenzenesulfonyl)imidazole (4a), 1-(p-aminobenzenesulfonyloxy)benzotriazole (4b), and 2-phenyl-4-(p-aminobenzenesulfonyl)-1,3,4-oxadiazoline-5-thione (4c) were synthesized by reacting p-isocyanatobenzenesulfonyl chloride (1) with stoichiometrical quantities of water in the presence of dibutyltin didodecanoate and subsequently with imidazole, 1-hydroxybenzotriazole and 2-phenyl-1,3,4-oxadiazoline-5-thione, respectively. The self-polycondensation of 4a-c, leading to poly(p-benzenesulfonamide) (7), was carried out in solution using polar aprotic solvents, N-methyl-2-pyrrolidone (NMP) and hexamethylphosphoric triamide (HMPA), and acidic media, dimethyl sulfoxide (DMSO) and m-cresol, with or without an appropriate acid catalyst or acid acceptor under mild conditions. Poly(p-benzenesulfonamide) having the highest reduced viscosity of 0,14 dl·-1 was obtained almost quantitatively from 4c by using m-cresol as a solvent without any acid catalyst and acid acceptor at 25°C. The polymers are soluble in polar aprotic solvents such as NMP, HMPA and DMSO and in aqueous sodium hydroxide. These poly(p-benzenesulfonamide)s are less thermally stable than completely aromatic polyamides, because the initial weight-loss started at 250-350°C. Aminolysis of three benzenesulfonic acid derivatives, 1-benzenesulfonylimidazole (5a), 1-benzenesulfonyloxybenzotriazole (5b), and 2-phenyl-4-benzenesulfonyl-1,3,4-oxadiazoline-5-thione (5c), with the same leaving groups was also carried out as a model reaction of self-polycondensation to determine the reaction conditions.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021881206
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  • 9
    Electronic Resource
    Electronic Resource
    Polyelectrolyte complex of heparin with chitosan (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 2209-2211 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750724
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  • 10
    Electronic Resource
    Electronic Resource
    Polyelectrolyte complex of sodium dextran sulfate with chitosan (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 3593-3596 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021751223
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