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  • 1
    Electronic Resource
    Electronic Resource
    Assessment of Pisum sativum agglutinin in identifying acrosomal damage in stallion spermatozoa (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 32 (1992), S. 23-27 
    Details
    ISSN: 1040-452X
    Keywords: Assay ; Lectin ; binding ; Fluorescence ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The use of fluorescein-conjugated Pisum sativum agglutinin (FITC-PSA) was evaluated for its ability to distinguish acrosome-intact from acrosome-damaged stallion spermatozoa. Incubation of fresh (acrosomeintact) and frozen-thawed (acrosome-damaged) spermatozoa with FITC-PSA resulted in acrosome-intact spermatozoa that exhibited no fluorescence, while acrosome-damaged spermatozoa exhibited fluorescent staining over the rostral portion of the head and equatorial segment. Experiments using mixtures of various ratios of acrosome-intact and acrosome-damaged spermatozoa determined the precision (intrasample coefficient of variation), and linearity (increased percentage of spermatozoa with PSA binding, with increased percentage of frozenthawed spermatozoa in a sample) of FITC-PSA binding. The binding of FITC-PSA increased in samples as the portion of frozen-thawed (acrosome-damaged) to fresh (acrosomeintact) spermatozoa increased. A positive correlation existed (r = 0.98, P 〈 0.05) between the percentage of FITC-PSA bound sperm and the proportion of damaged spermatozoa added to a sample. Location of PSA lectin binding on acrosome-damaged spermatozoa, determined by electron microscopy using gold-conjugated PSA, was to components of the outer acrosomal membrane and acrosomal matrix. These results demonstrate that FITC-PSA binding may be useful in determining acrosomal integrity of fresh and frozen-thawed stallion spermatozoa. © 1992 Wiley-Liss, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080320105
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  • 2
    Electronic Resource
    Electronic Resource
    Non-steady-state transport of diffusants in ternary laminate slabs (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 2901-2917 
    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: Equations describing transient diffusion in ternary laminate slabs are presented. The equations developed can be applied to: (I) asymmetric ABC slabs separating two semi-infinite baths, each bath containing either the same or different concentration(s) of permeant; (II) asymmetric ABC slabs separating a semi-infinite bath from an impermeable substrate; (III) asymmetric ABC slabs with impermeable substrates attached to laminas A and C. Further, the equations can be applied to slabs containing initially uniform, but not necessarily equilibrial, concentrations of permeant in each lamina. Some numerical examples of the aforementioned diffusion systems I and II are discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270816
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  • 3
    Electronic Resource
    Electronic Resource
    Growth of human osteoblast-like cells on alkanethiol on gold self-assembled monolayers: The effect of surface chemistry (1998)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 41 (1998), S. 431-442 
    Details
    ISSN: 0021-9304
    Keywords: osteoblast ; cell-surface interaction ; alkanethiol self-assembled monolayer ; mercaptopropanoic acid ; octanethiol ; surface chemistry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Primary human osteoblasts were cultured on self-assembled monolayers (SAMs) of alkylthiols on gold with carboxylic acid and methyl termini, and the kinetics of cell attachment and proliferation were measured. Over 90 min approximately twice as many cells attached to carboxylic-acid-terminated monolayers as attached to methyl-terminated monolayers. After 24 h the number of cells attached to carboxylic-acid-terminated monolayers was ten times that attached to the methyl-terminated monolayers. Cell morphology and cytoskeletal actin organization also were found to be different. Osteoblasts were cultured on SAMs that were patterned by photolithographic techniques. Cells attached almost exclusively to carboxylic-acid-functionalized areas of the patterned surfaces, leaving methyl-functionalized regions bare. The patterns strongly influenced the morphology of the attached cells. After 24 h, cells were observed to bridge between carboxylic-acid-terminated regions separated by 75 μm, methyl-terminated regions but not those separated by 150 μm methyl-terminated regions. After 6 days in culture osteoblasts formed multilayers on the carboxylic-acid-terminated regions of the pattern. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res, 41, 431-442, 1998.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Fluidized-Bed reactor model verification on a reactor of industrial scale (1987)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 33 (1987), S. 619-627 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Previous published comparisons between fluidized-bed reactor models and experimental data have almost exclusively been in laboratory and pilot-plant scale equipment. This paper compares data obtained in an industrial phthalic anhydride reactor of 2. 13 m dia. using naphthalene as the feedstock with three models, the Kato and Wen bubble-assemblage model, the Kunii and Levenspiel three-phase bubbling-bed model, and Grace's two-phase bubbling-bed model. For the conditions of operation (U = 0.43 m/s, d̄p = 53 μm, H = 7.9 m, T = 636 K), all three models give similar predictions and each gives a good overall prediction of the conversion and selectivity if the reaction kinetics are based on the early study of DeMaria et al. (1961). Hydrodynamic parameters needed for the models are calculated from equations available in the literature. Grid and freeboard effects appear to play relatively minor roles in determining the overall conversion and yields for the reactor in question.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690330410
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  • 5
    Electronic Resource
    Electronic Resource
    Spectral narrowing in optically pumped poly (p-phenylenevinylene) FilmsWe thank Cambridge Display Technology (CDT) for supplying the PPV precursor used in this research. This work is supported by the Engineering and Physical Sciences Research Council, and is part of a collaborative program with the chemistry group of A. B. Holmes and S. C. Moratti in Cambridge. (1997)
    Weinheim : Wiley-Blackwell
    Advanced Materials 9 (1997), S. 547-551 
    Details
    ISSN: 0935-9648
    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
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19970090705
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  • 6
    Electronic Resource
    Electronic Resource
    Cyclophanes, XXXV. DNMR, molecular mechanics, and crystal structures of 2,11-dithia[3.3]orthometacyclophane and 2,11-dithia[3.3]orthoparacyclophane (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 2381-2386 
    Details
    ISSN: 0009-2940
    Keywords: Dithiacyclophanes ; DNMR ; Molecular mechanics ; Cyclophanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The syntheses of 2,11-dithia[3,3]orthometacyclophane (5) and 2,11-dithia[3,3]orthoparacyclophane (6) by dithiol-dibromide coupling are described. Whereas the yield of 5 is not significantly affected by the substrate pairing, that of 6 is. Both compounds exhibit a temperature-dependent 1H-NMR spectrum. An energy barrier of 11.0 ± 0.2 kcal/mol (45.7 ± 0.8 kJ/mol) has been calculated for 5, but that of 6 was too low to be determined. Slightly contrasting results were obtained from two different molecular mechanics programs for the relative energies of the six limiting conformations of 5. Crystal structure determinations of 5 and 6 have been carried out, and the conformational behavior of 5 and 6 in solution and in the solid state is discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901231221
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  • 7
    Electronic Resource
    Electronic Resource
    syn-ar,ar′-Difluorometacyclophanes: Strong 19F,19F Spin - Spin Interactions Transmitted through SpaceDedicated to Prof. Dr. Albrecht Mannschreck on the occasion of this 60th birthday. (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1119-1124 
    Details
    ISSN: 0009-2940
    Keywords: Difluorometacyclophanes ; syn-Metacyclophanes ; Through-space F,F spin coupling ; X-ray structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The close approach of the fluorine nuclei in the difluorinated syn-[3.3]metacyclophanes 1, 2 and their [2.2] analogues 3, 4 leads to strong 19F,19F spin-spin interactions which obey a through-space mechanism. The geometries of 1-4 were estimated by MM2 molecular mechanics computations, those of 1 and 3 were also determined by X-ray structural analyses. The decrease of the F,F internuclear distance in the series 1, 2, 3, 4 (2.78-2.48 Å) correlates with an increase of J(FF) from +42.1 to +99.2 Hz. It follows that, for a given distance d(FF), J(FF) is up to twice as large as a previous empirical correlation has assumed and even larger with respect to earlier theoretical calculations. Only weak F,F spin interaction occurs in 8, the anti isomer of 4.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270623
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  • 8
    Electronic Resource
    Electronic Resource
    Cyclophanes, XXXVIII. [2]Metacyclo[2]indenophanes: Synthesis, Anions and Iron ComplexesDedicated to Professor Klaus Hafner on the occasion of his 65th birthday. (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 167-175 
    Details
    ISSN: 0009-2940
    Keywords: Cyclophanes ; Indenyl anions ; Iron complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: [2.2]Metacyclophane can be directly formylated according to the Rieche method to give 4-formyl[2.2]metacyclophane (12) in 44% yield. The synthesis of the [2]metacyclo[2]indenophane 8 from the aldehyde 12 by the pathway previously employed for the corresponding [2.2]paracyclophanes failed due to the harsh conditions of the cyclization step. An alternative synthesis of 8 and its isomer 9 involving the construction of the five-membered ring prior to that of the cyclophane unit succeeded. Compounds 8 and 9 were obtained as an 82:18 mixture, deprotonation of which afforded the anion 10, which shows long-term stability. The 1H-NMR spectrum of this anion does not exhibit a through-space charge transfer due to its structure. The 1H-NMR parameters and molecular mechanics calculations are discussed. Both faces of 10 react in the presence of FeCl2 · 2 THF and a twentyfold excess of LiCp to give a 70:30 mixture of the ferrocene derivatives 7 and 35.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260125
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  • 9
    Electronic Resource
    Electronic Resource
    Phan-tastische Phane - Strukturvielfalt ohne Ende (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 108 (1996), S. 2221-2224 
    Details
    ISSN: 0044-8249
    Keywords: Arene ; Cyclophane ; Gespannte Ringe ; Kohlenwasserstoffe ; Polycyclen ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19961081806
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  • 10
    Electronic Resource
    Electronic Resource
    The flash photolysis of azomethane. Minor products from the photolysis of methyl radicals and a rate constant for CH3 + NO (1976)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 8 (1976), S. 883-896 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The flash photolysis of azomethane in a quartz reaction vessel produces mainly ethane (〉75%) plus smaller quantities of methane, ethylene, and acetylene. The minor products are interpreted quantitatively in terms of methyl radical photolysis at 216 nm to give CH2 and H. This interpretation is substantiated by the dependence of the minor products on flash intensity. The reduction of the ethane yield on adding NO is employed to obtain a rate constant for CH3 + NO as a function of total pressure, based on a value for methyl radical recombination of 4.2 × 10-11 cm3/molec · sec. An RRKM analysis is used to extrapolate the data to give a limiting high-pressure rate constant for CH3 + NO of (1.2 ± 0.1) × 10-11 cm3/molec · sec at 298°K.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550080608
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