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  • Cell & Developmental Biology  (3)
  • Organic Chemistry  (3)
  • Polymer and Materials Science  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Trifluoroethanol/chloroalkane mixtures: Excellent novel solvents for aliphatic polyamides (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 2505-2525 
    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: Certain mixtures of TFE/CHCl3 were found to be excellent solvents for aliphatic polyamides such as nylon-6, nylon-66, nylon-11, nylon-12, nylon-69, nylon-610, and nylon-612. Intrinsic viscosities were measured and Mark-Houwink coefficients determined for nylon-6/TFE/CHCl3, indicating TFE-rich mixtures to be better solvents than TFE alone. Similar results were obtained for TFE/CH2Cl2. Four ternary phase diagrams were constructed for nylon-6/TFE/chloroalkanes, of which the ones with CHCl3 and CH2Cl2 are the most interesting. In the nylon-6/TFE/CHCl3 diagram higher nylon-6 solubility in TFE-rich mixtures and a biphasic region in the CHCl3-rich compositions are evident. In the TFE/CH2Cl2 system, the higher dissolution of nylon-6 is observed, but no biphasic regions are detected. In certain solvent compositions and/or polymer concentrations the polymer is incompletely soluble, making the phase diagrams rather complicated. Observed thermodynamic excess properties appear to relate to the quality of TFE/chloroalkanes as solvents for nylon-6. Studies on swelling of nylon-6 networks immersed in TFE/CHCl3 show a behaviour previously described by Krigbaum and Carpenter for a general case where the formation of contracts between molecules of the two solvents is discouraged and their preferential solvation of the polymer is, therefore, encouraged. The phenomena observed in this work can be qualitatively explained as arising from antagonistic interaction of TFE molecules with chloroalkane ones. The presence of the polyamides in solution reduces such contacts, enchancing the dissolution of the polymer in the (TFE-rich) solvent mixtures.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070300618
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  • 2
    Electronic Resource
    Electronic Resource
    Measurements of vapor sorption/desorption properties of ultrathin polymeric filmsPresented at Division of Polymer Chemistry, American Chemical Society Meeting, New Orleans, Louisiana, March 1977. (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 23 (1979), S. 1795-1802 
    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: After a brief review of various standard methods of diffusion measurements of vapors into and out of polymeric solids, a direct gravimetric method for studying the sorption/desorption process in thin polymer films is discussed. The apparatus used consisted of a sensitive electrical balance housed in a vacuum pump. The sorption and desorption characteristics of thick polystyrene films were studied for comparison with literature values. The system polystyrene/methylene chloride was chosen to calibrate the system because of its known data. Experiments were carried out using the polystyrenes PS-5 and Dow Trycite 1000 at 35 and 50 mm Hg. Results agreed well with those reported in the literature. The apparatus was also suitable for measuring the very initial uptake of vapor. This information is important in the study of very thin films where the amount of vapor absorbed is minimum and the initial rate of uptake is almost instantaneous.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070230619
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  • 3
    Electronic Resource
    Electronic Resource
    Morphology of the prairie dog gallbladder: Normal characteristics and changes during early lithogenesis (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 186 (1989), S. 133-143 
    Details
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Studies were undertaken to describe the normal structure of the prairie dog gallbladder and adjacent cystic duct, and then to determine sequential changes that occurred as abnormalities in bile composition developed during high cholesterol feeding. Control animals were fed a diet with trace cholesterol, while experimental animals were fed a diet enriched with 1.2% cholesterol for 1, 2, 3, or 4 weeks. Light microscopy and scanning and transmission electron microscopy were used to characterize morphologic changes at each time interval. Biliary lipid composition was altered in all experimental groups, evidenced by significant decreases in bile-acid-to-cholesterol ratios. Cholesterol crystals appeared in experimental bile at 1 and 2 weeks, while stones formed at 3 and 4 weeks. The cystic duct and neck of the gallbladder occasionally displayed goblet cells. Little mucus was demonstrable in principal cells of the gallbladder, but much more in those lining the cystic duct. After 2 weeks of lithogenic diet, there was an increase in mucus content and secretion from all areas, as well as an influx of polymorphonuclear and mononuclear leukocytes. Accumulation of plasma cells in the lamina propria was an especially prominent feature of experimental tissues. These results suggest that (1) there is regional heterogeneity in the mucus content of the gallbladder and cystic duct of the prairie dog, and (2) both regions respond to lithogenesis with mucus hypersecretion and acute and chronic inflammatory changes prior to the appearance of cholesterol gallstones.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1001860204
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  • 4
    Electronic Resource
    Electronic Resource
    Aufarbeitung von Single-cell-Protein  -  Senken des Nucleinsäure-Gehalts von BäckerhefeVortrag auf dem Jahrestreffen der Verfahrens-Ingenieure, 1. bis 3. Okt. 1980 in Straßburg. (1981)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 53 (1981), S. 279-279 
    Details
    ISSN: 0009-286X
    Keywords: Protein-Aufbereitung ; Nucleinsäure-Abbau ; Purin-Zersetzung ; Single-cell-Protein ; Bäckerhefe ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330530412
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  • 5
    Electronic Resource
    Electronic Resource
    The design, synthesis, and characterization of tight-binding inhibitors of calmodulin (1985)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 29 (1985), S. 83-93 
    Details
    ISSN: 0730-2312
    Keywords: peptide design ; calmodulin-peptide interactions ; calmodulin ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Based on a consideration of the probable structure of calmodulin and sonic natural peptides known to interact with it, two calmodulin-binding peptides were designed. These peptides bind to calmodulin in helical conformations and are capable of forming electrostatic and hydrophobic interactions with calmodulin. Their dissocation constants for binding (≤ 210 and 400 pM) place them as the tightest-binding inhibitors of calmodulin thus far reported. The study of the interactions of these and similar peptides with calmodulin will provide valuable insights into the mechanisms whereby calmodulin binds to target enzymes, and it also serves as an excellent model system for exploring the physical chemistry of protein-protein interaction.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240290204
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  • 6
    Electronic Resource
    Electronic Resource
    Laminin decreases PRL and IGFBP-1 expression during in vitro decidualization of human endometrial stromal cells (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 163 (1995), S. 30-37 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The expression of laminin, a major constituent of endometrial cell basement membranes, is increased during differentiation of human endometrial stromal cells (decidualization). To determine whether laminin plays a role in decidualization, we studied the effects of laminin substrate on the synthesis and release of prolactin (PRL) and insulin-like growth factor binding protein-1 (IGFBP-1), two major secretory proteins of decidualized stromal cells. Endometrial stromal cells were plated on laminin as well as several other extracellular matrix (ECM) proteins (types 1 and IV collagen or fibronectin) and on plastic, and cultured in media containing medroxyprogesterone acetate (MPA) and estradiol. Cells cultured on plastic or ECM proteins displayed similar morphological changes indicative of decidualization. However, the release of PRL and IGFBP-1 from cells cultured on plastic and ECM proteins (types 1 and IV collagen and fibronection) was approximately 2.1-fold and 2.8-fold greater respectively, than from cells cultured on laminin. The decrease in PRL and IGFBP-1 expression in cells cultured on laminin was not due to differences in initial cell attachment efficiency or final DNA content. In addition, laminin had no effect on the content of laminin protein or fibronectin mRNA levels, indicating that the effects of laminin on PRL and IGFBP-1 were specific. PGE2 stimulated the release of PRL and IGFBP-1 from cells cultured on laminin to levels comparable to those from cells cultured on plastic or other ECM proteins. This indicates that the decrease in PRL and IGFBP-1 release by laminin was not due to a generalized unresponsiveness. In contrast to the effects of laminin during decidualization, PRL expression was not altered by laminin in terminally differentiated decidual cells isolated at term. Our results support a role for laminin in selectively regulating PRL and IGFBP-1 gene expression during in vitro decidualization of human endometrial stromal cells. © 1995 Wiley-Liss, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041630105
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  • 7
    Electronic Resource
    Electronic Resource
    Solid-State CP/MAS 13C-NMR Spectra of Oligolides derived from 3-hydroxybutanoic acidFor an early review article in which the preparation of these oligolides was first mentioned, see [la]. An extended abstract of a lecture given on the subject was published in [1b]. An extensive general article entitled ‘Poly(hydroxyalkanoates), the Fifth Class of Physiologically Important Organic Biopolymers?’ was submitted for publication [1c].Details about preparation and structure determination of these oligolides were published elsewhere [2a-d] or will be included in a paper in preparation [2e]. (1993)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 76 (1993), S. 915-923 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The solid-state CP/MAS 13C-NMR spectra (cross-polarization/magic-angle spinning 13C-NMR) of eight lower cyclic and one linear oligomers and several polymers of (R)-3-hydroxybutanoic acid (3-HB) are reported. The polymeric samples of different origin and molecular weight give remarkably similar and well resolved spectra, indicating considerable similarity in the conformations of the molecules and homegeneity in the solid-state environment. The crystalline cyclic oligomers 1-8 containing 3-9 units of 3-HB give very well resolved spectra. The number of nonequivalent positions in the solid state can be identified and is in accord with structures from X-ray diffraction where these were determined. The spectra of the oligolides become increasingly similar to those of the polymer as the ring size increases. This spectral evidence supports the view of a homogeneous and well defined conformation for the polymeric material (as proposed previously, based on other experiments).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19930760215
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  • 8
    Electronic Resource
    Electronic Resource
    Organozinnverbindungen, XIX. Zur Synthese von stannylierten Alkinen (1968)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 716 (1968), S. 19-28 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Stannylierte Alkine RnSn(C = C - R′)4-n mit n = 0, 2, 3 (Tabb. 2, 3) werden einfach und schonend dargestellt durch azeotropen Wasser-Entzug aus dem freien Alkin und Dialkyl(bzw. -aryl)-zinnoxid oder Trialkyl(bzw. -aryl)-zinnoxid. Der Rest R′ kann funktionelle Gruppen tragen, z.B. OCH3, CONH2, CO2CH3 und CN. Das Verfahren ist auch auf Pb- und Hg-Alkin-Verbindungen anwendbar. Der Mechanismus von Knüpfung und Hydrolyse der C≡C-Sn-Gruppe wird untersucht. Sowohl aus vergleichenden IR-Studien wie aus Valence-Bond-Berechnungen (VB + CI-Methode) folgt, daß am Bindungssystem eine Struktur C≡C-Sn beteiligt ist.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19687160104
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  • 9
    Electronic Resource
    Electronic Resource
    Organozinnverbindungen, XX. Synthesen mit stannylierten Alkinen (1968)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 716 (1968), S. 29-36 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Stannyl-alkine reagieren mit Phenylisocyanat überraschenderweise zu 5-Alkylidenhydantoinen 3, mit Diphenyl-tetrazin in einer Diels-Alder-Reaktion zu Pyridazinen 6, mit Jod zu Jod-alkinen; Carbonsäure-chloride führen zu Alkinyl-ketonen, polarisierte Carbonyl-Verbindungen analog einer Grignard-Reaktion zu substituierten Propargylalkoholen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19687160105
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