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  • 1
    Electronic Resource
    Electronic Resource
    Triphenylphosphine and triphenylarsine complexes of mercury(II) thiocyanate, nitrate, and perchlorate (1970)
    s.l. : American Chemical Society
    Inorganic chemistry 9 (1970), S. 423-425 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50084a065
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of "tied-back" functionalizable derivatives of tetra-tert-butylethylene (1982)
    s.l. : American Chemical Society
    The @journal of organic chemistry 47 (1982), S. 3563-3566 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00139a042
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  • 3
    Electronic Resource
    Electronic Resource
    Some Physical Properties of Perfluoro-n-hexane (1958)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 80 (1958), S. 83-85 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01534a023
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Owl eyes: Accommodation, corneal curvature and refractive state (1983)
    Springer
    Journal of comparative physiology 151 (1983), S. 277-284 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The eyes of 15 species of owls were examined by retinoscopy, static photorefraction, dynamic photorefraction and keratometry. Eyes of all species were found to be of high optical quality as indicated by crisp retinoscopic reflexes and to be relatively free of any form of astigmatism. In contradiction to the traditional view of owl accommodation, we found that species differed widely with regard to their ability to focus near targets. Virtually all species could focus distant targets, but the ability to focus targets closer than one meter was significantly correlated with small body size. The accuracy and validity of the dynamic photorefractive method were determined by measurements on an artificial eye.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00623904
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  • 5
    Electronic Resource
    Electronic Resource
    Nanoscale topography of the basement membrane underlying the corneal epithelium of the rhesus macaque (2000)
    Springer
    Cell & tissue research 299 (2000), S. 39-46 
    Details
    ISSN: 1432-0878
    Keywords: Atomic force microscopy Cornea Extracellular matrix Matrigel Electron microscopy Primate Rhesus monkey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. This paper quantitatively defines the nanoscale topography of the basement membrane underlying the anterior corneal epithelium of the macaque. Excised corneal buttons from macaques were placed in 2.5 mM ethylenediaminetetraacetate (EDTA) for 2.5 h, after which the epithelium was carefully removed to expose the underlying basement membrane. The integrity of the remaining basement membrane was verified using fluorescent microscopy in conjunction with antibody staining directed against laminin and collagen type IV as well as transmission electron microscopy. Characterization of the surface of the basement membrane was performed using transmission electron microscopy, high-resolution, low-voltage scanning electron microscopy, and atomic force microscopy. Quantitative data were obtained with all three imaging techniques and compared. The basement membrane has a complex topography consisting of tightly cross-linked fibers intermingled with pores. The mean elevation of features measured by transmission electron microscopy, scanning electron microscopy, and atomic force microscopy was 149±60 nm, 191±72 nm, and 147±73 nm, respectively. Mean fiber diameter as measured by SEM was 77±44 nm and pore diameter was 72±40 nm, with pores occupying approximately 15% of the total surface area. Similar feature types and dimensions were also found for Matrigel, a commercially available basement membrane-like complex, supporting that a minimum of artifact was introduced by corneal preparative procedures to remove the overlying epithelium. Topographic features amplified the surface area over which cell-substratum interactions occur by an estimated 400%. The three-dimensional structure of the basement membrane exhibits a rich complex topography of individual features, consisting of pores and fibers with dimensions ranging from 30 to 400 nm. These nanoscale substratum features may modulate fundamental cell behaviors such as adhesion, migration, proliferation, and differentiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004419900074
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  • 6
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks based on thermoplastic polyurethanes (TPUS) and cis-1,4-polyisoprene (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 53 (1994), S. 1425-1434 
    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: Semi-interpenetrating polymer networks based on two elastomers, cis-1,4-polyisoprene (PI) and thermoplastic polyurethane elastomers (TPUs) were prepared in varying compositions. The PI component was cross-linked using peroxide initiators. Modulus and mechanical properties were investigated as a function of composition and temperature. Slight synergisms were observed in mechanical properties, particularly for compositions containing 10% PI by weight. Little or no molecular mixing is shown by differential scanning calorimetry (DSC) for these two-phase materials. © 1994 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070531104
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  • 7
    Electronic Resource
    Electronic Resource
    The influence of the equilibrium melting temperature on the supermolecular morphology of several polymers (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 48 (1993), S. 1321-1329 
    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: At a constant isothermal crystallization temperature (Tc), the crystalline morphologies of several polymers have been found to be a function of the melt-liquid temperature (T1). At a constant Tc below a critical crystallization temperature (T*c [about 0.9 T*m(K)], a transition from a nonspherulitic to a spherulitic morphology occurs when the melt liquid is heated above a melt-liquid transition temperature, (Tlt) [approximately 1.03 Tm (K)], where Tm is the observed melting temperature of the sample. The melt-liquid transition temperature, Tlt, which experimentally affects the visible morphology of a semicrystalline polymer, is apparently indistinguishable from the thermodynamic melting temperature, T*m, determined by the Hoffman-Weeks procedure. The X-ray powder diffraction patterns of spherulitic and nonspherulitic morphologies were identical, independent of the heating-cooling cycle. This suggests that the transition that occurs at TIt does not affect the arrangement of polymer molecules in the crystallite, but only the manner in which the crystallites are arranged in the supermolecular morphology. The evidence suggests, at least for the polymers studied, that a residual order exists in the melt until the T*m or TIt of the particular polymer is reached. © 1993 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070480802
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of poly(3,3-bisethoxymethyl oxetane) and poly(3,3-bisazidomethyl oxetane) and their block copolymers (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 267-281 
    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: The homopolymers, poly(3,3-bisethoxymethyl oxetane) (polyBEMO), poly(3,3-bisazidomethyl oxetane) (polyBAMO), and triblock copolymers based on these homopolymers and a statistical copolymer center block composed of BAMO and 3-azidomethyl-3-methyl oxetane AMMO were synthesized and characterized by differential scanning calorimetry, modulus-temperature, optical microscopy, membrane osmometry, and solution and melt viscosity. The values of K and a for the Mark-Houwink equation were found to be 7.29 × 10-3 mL/g and 0.80, respectively, for polyBEMO at 25°C using number-average molecular weights. Glass transition temperatures were in the range -25 to -40°C and melting temperatures were between 65 and 90°C for all polymers. The melting temperature was found to increase as expected with molecular weight. Melt viscosities of triblock copolymers with polyBAMO end blocks were at least an order of magnitude lower than those with polyBEMO end blocks and clear optically, suggesting that the polyBAMO-based triblock copolymers formed one phase in the melt, while the polyBEMO-based triblock materials (milk white) phase separated. The addition of filler raised the melt viscosity to a level between that predicted by the Guth-Smallwood and the Mooney equations.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070370121
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  • 9
    Electronic Resource
    Electronic Resource
    Multiple endotherm melting behavior in relation to the morphology of poly[3,3- bis(ethoxymethyl) oxetane] (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 1379-1390 
    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: Two crystalline melting peaks have been observed by differential scanning calorimetry for low molecular weight poly[3,3-bis(ethoxymethyl) oxetane] (polyBEMO) samples, Mn 〈 1 × 104 g/mol, whereas only one melting peak has been observed for samples of higher molecular weight, Mn 〈 1 × 104 g/mol. Crystallization of low molecular weight samples at large supercoolings produces the lower melting form while low supercooling or annealing favors the higher melting species. Enthalpy of fusion values obtained by DSC for a multiple melting endotherm sample range from 28 to 39 J/g for crystallization temperatures from 58 to 35°C, respectively. Optical microscopy studies indicate that the lower melting peak corresponds to a spherulitic type morphology and the higher melting peak correlates to a fine grained crystal structure. Wide angle X-ray powder diffraction studies do not detect differences in the crystal structures of samples exhibiting either one or two melting peaks, which suggests that the multiple melting phenomenon is due to differences in morphology rather than the presence of different crystal forms.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070400724
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  • 10
    Electronic Resource
    Electronic Resource
    The relationship between the equilibrium melting temperature and the supermolecular structure of several polyoxetanes and polyethylene oxide (1987)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 27 (1987), S. 781-787 
    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: The relationships between equilibrium melting temperatures (Tm*) and crystalline morphology of poly[3,3bis(ethoxymethyl)oxetane], (polyBEMO), poly[3,3-bis (azidomethyl)oxetane], (polyBAMO), and poly(ethylene oxide), (PEO), were characterized. The Hoffman-Weeks extrapolation procedure led to Tm* values of 92, 102, and 69°C for these three polymers, respectively. The gross morphologies of polyBEMO, polyBAMO, and PEO were studied as a function of melt-liquid temperature (Ti) and isothermal crystallization temperature (Tc) by visible light microscopy. Spherulitic morphologies were observed for polyBEMO, polyBAMO, and PEO when Ti was above Tm*, while nonspherulitic (hedritic) morphologies were observed at Tls below Tm*. Mixed morphologies were observed when Tl was approximately equal to Tm*.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760271103
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