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  • 1
    Electronic Resource
    Electronic Resource
    Mass spectrometric comparison of ordinary and fully deuterated α- and β-carotene (1972)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 6 (1972), S. 843-851 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The individual, deuterated, isomeric α- and β-carotenes were isolated from the green alga, Scenedesmus obliquus, cultivated in D2O containing 99·7 to 99·8 atom percent deuterium. Mass spectroscopy showed that both the α- and β-deuterio-carotene preparations contained principally the fully deuterated pigment molecules (C40D56), small quantities of deuterated molecules with one proton (C40D55H) and yet smaller quantities of deuterated molecules with two protons (C40D54H2). From statistical calculations the deuterio-carotene preparations also contained one to several isotopically-substituted deuterio-carotenes of each mass in the mass range 585 to 599 because of variation of the number of 13C and H atoms per molecule. The mass fragmentation of the deuterated pigments was analogous to that of the respective ordinary α- and β-carotene. It indicated that the protons in the C40D55H and C40D54H2 molecules were distributed approximately randomly in various parts of the structure as in the terminal rings and in the ends and central portions of the polyene chain.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210060804
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Untersuchung von Form und Größe der Moleküle bei hochmolekularen Substanzen durch Ausbreiten zu monomolekular dicken Schichten auf einer Wasseroberfläche. II. Vergleich von Polysacchariden mit „abgebauten“ Polysacchariden (1929)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 474 (1929), S. 296-300 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19294740107
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  • 3
    Electronic Resource
    Electronic Resource
    Mass fragmentation and structure of siphonaxanthin, siphonein and derivatives (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 565-572 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: High resolution mass spectrometry has been employed to establish the structural formulae of the unique carotenoid pigment siphonaxanthin, its natural ester, siphonein and several derivatives. Siphonaxanthin exhibits a fragmentation reaction that is unusual among carotenoid pigments, namely, the elimination of carbon dioxide, observed as [M - CO2] and [M - (CO2 + H2O)]. This reaction involves the migration of an oxygen atom. Siphonaxanthol, a partially hydrogenated siphonaxanthin, exhibits a similar reaction involving the elimination of carbon monoxide and formaldehyde. From the fragmentation of derivatives of siphonaxanthin, such as the triacetate, the dimethyl ether and siphonaxanthol, and also from the fragmentation of related pigments, such as loroxanthin and fucoxanthin, the unique structural units responsible for the elimination of the carbon dioxide and carbon monoxide have been identified.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050508
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  • 4
    Electronic Resource
    Electronic Resource
    The bone-biomaterial interface. Davies, J. E. ed. Toronto: University of Toronto Press: 1991 (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 3 (1992), S. 237-238 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770030312
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  • 5
    Electronic Resource
    Electronic Resource
    A circular dichroism microspectrophotometer (1982)
    New York : Wiley-Blackwell
    Biopolymers 21 (1982), S. 1899-1908 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A microscope capable of measuring the CD of intact single eukaryotic cells, DNA microcrystals, and other microscopic structures has been constructed and tested. It can measure the CD spectra in the 200- and 800-nm wavelength range and consists of a modification to a standard Cary 60 CD machine in combination with a Zeiss uv microspectrometer. Preliminary CD spectra of red blood cells and lymphocytes are presented.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360210916
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  • 6
    Electronic Resource
    Electronic Resource
    Application of scanning acoustic microscopy to polymeric materials (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 52 (1994), S. 329-352 
    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: Scanning acounstic microscopy (SAM) is now a viable technique for the nondestructive evaluation of various materials. SAM is capable of distinguishing defect and discontinuities and/or the variations in elastic properties on a scale comparable to optical microscopy. The pulse mode utilizes a single narrow acoustic wave that permits surface and internal studies over a range of frequencies from 5 to 200 MHz with resolution down to approximately 20 μm. This technique was applied to image surface features of an opaque sheet-molding compound and to analyze flow patterns of chopped glass fibers. The pulse mode was also used to image the internal damage sustained from a high-speed projectile in oriented polypropylene and two carbon fiber-reinforced composites, with different matrices. Most importantly, the pulse mode of the acoustic microscope is a nondestructive method and the interior of samples that are entirely opaque can be readily studied with this unique instrument. The burst mode is composed of a group of acoustic waves and is capable of operating at higher frequencies than the pulse mode up to several gigahertz. This mode permits resolution down to the micrometer level and is especially useful for investigating surface and subsurface microstructural features. The burst mode was used to determine the distribution of chopped fibers in a PEEK matrix and carbon black particulars in an adhesive, the orientation of the mineral phase and density variations in a single osteon from a dog femur, and the orientation of collagen fibers in sheep meniscus. Also, the sensitivity of the burst mode to surface features was used to examine the topographical features in a multilayer composite and a blend of poly(vinyl chloride) (PVC) with poly(ethylene terephthalate) (PET) particulates. © 1994 John Wiley & Sons, Inc.
    Additional Material: 24 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070520217
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  • 7
    Electronic Resource
    Electronic Resource
    The elastic properties of hard tissues and apatitesContribution No. 45 from the Laboratory for Crystallographic Reserach, Department of Physics. (A preliminary version of this paper was presetned at the Engineering Foundation's Research Conference, “Bioceramics-Engineering in Medicine” Henniker, New Hampshire, August 3-7, 1970). (1972)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 6 (1972), S. 221-233 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The pressure dependence of the elastic constants of various halides, hard tissues and synthetic apatites have been examined in the 0- to 50-kilobar range using a solid media, pressure apparatus coupled with an ultrasonic interferometer. The samples includ: hydroxy-, fluor-, and chlor-apatite, NaCl, CaF2, mollusc shell (aragonite), ivory, dentin and enamel, and fish, bovine, and human bones. High pressures were used in order to assess the effects of porosity in aggregate samples and to make measurements on specimens of ideal density. Computer analysis of the measured longitudinal and shear ultrasonic velocities yields the pressure dependence of the bulk, shear, and Young's moduli and Poisson's ratio. Atmospheric pressure values at ideal density are obtained by back extrapolation from the high pressure measurements.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820060311
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  • 8
    Electronic Resource
    Electronic Resource
    Scanning acoustic microscopy study of titanium-ceramic interface of dental restorations (1998)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 42 (1998), S. 508-516 
    Details
    ISSN: 0021-9304
    Keywords: nondestructive analysis ; titanium-ceramic interface ; scanning acoustic microscopy ; protective coating ; four-point bending test ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Failures that occur in titanium-ceramic restorations are of concern in clinical dentistry. The purpose of this study was to nondestructively characterize the internal cracks and nonadherent defects at the titanium-porcelain interface using scanning acoustic microscopy. Titanium samples coated with porcelain without a bonding agent, with sputter coated palladium or chromium as an oxygen diffusion barrier on the titanium, and with the use of a porcelain bonding agent (control group) were compared. The scanning acoustic microscopy analyses were correlated with four-point bending test results. The group that was initially coated with palladium had fewer interfacial defects and a higher load to failure than the control group, and the group that did not contain the bonding agent had a higher void area and a lower load to failure than the control group. The use of chromium produced no differences from the control group. Samples after a four-point bending test were also analyzed by scanning electron microscopy. The scanning electron microscopy was not able to characterize interfacial defects at the fractured titanium-ceramic interface for some of the samples. The validity of nondestructive analysis at the Ti-ceramic interface using scanning acoustic microscopy was demonstrated in this study. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res, 42, 508-516, 1998.
    Additional Material: 13 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    A composite model of the elastic behavior of dental amalgamContribution #42: This investigation was supported by U.S.P.H.S. Training Grant No. 5TI-DE-0117-07 and Research Grant No. 5POI-DE-2336-03 from the National Institute of Dental Research, N.I.H., and by the National Aeronautics and Space Administration through Rensselaer's Interdisciplinary Materials Research Center. (1971)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 5 (1971), S. 515-527 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A model describing the elastic behavior of dental amalgam as a composite material has been developed using elastic theory for quasi-homogeneous, quasi-isotropic systems. The elastic constants of the composite amalgam can be computed using Voigt-Reuss and Hashin-Shtrikman methods if the relative volume fractions and the elastic constants of the constituent phases are known. This model also relates the elastic behavior of the amalgam to manipulation during preparation. The elastic constants of several spherical and cut amalgams, as well as the constituent γ, γ1, and γ2 alloys, have been measured in the 0-50 kilobar range using a solid media pressure apparatus and an ultrasonic interferometer. High pressure studies are necessary so that the effects of porosity can be assessed. Calculations based on this model include the effects of porosity as well as the Hg content.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820050507
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  • 10
    Electronic Resource
    Electronic Resource
    Deep-tank culture of blue-green algae in H2O and D2O (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 13 (1971), S. 779-793 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A 160-liter stainless steel algal growth tank has been constructed and has been used essentially continuously for over three years. Filamentous and unicellular blue-green algae as well as a photosynthetic bacterium have been cultured using both ordinary and heavy water (99.8 atom % 2H). By using a recycling technique, yields as high as 25 g/liter of 2H2O have been obtained.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260130605
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