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  • Physics  (56)
  • Analytical Chemistry and Spectroscopy
  • Cell & Developmental Biology
  • GENERAL
  • 1970-1974  (135)
  • 1965-1969
  • 1955-1959
  • 1970  (135)
Collection
Keywords
Publisher
Years
  • 1970-1974  (135)
  • 1965-1969
  • 1955-1959
Year
  • 1
    Electronic Resource
    Electronic Resource
    Histogenesis of Swiss white mouse secondary palate from nine and one-half days to fifteen and one-half days In utero. I. Epithelial-mesenchymal relationships - light and electron microscopyThis work was supported by Research grant DE 03002 from the National Institute of Dental Research, NIH. (1970)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 130 (1970), S. 435-449 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Development of the secondary palate in Swiss white mouse embroyos was studied from age nine-and-one-half days in utero to the stage of mesenchymal coalescence in the secondary palate (approximately fifteen-and-one-half days). The greatest changes observed occur in the mesenchyme. At early stages, mesenchymal cells underlying oral ectoderm of the head are few and only occasionally contact the ectoderm. Electron micrographs show large intercellular spaces between the ectodermal cells. As embryogenesis continues, the mesenchymal cells become more numerous, closer to each other and closer to the epithelium. Just prior to horizontal transposition of shelves, the mesenchymal cells spread farther from each other and from the palatal epithelium and epithelium of the palatal tip becomes stretched. Ultrastructurally the intercellular spaces between epithelial cells of the palate tip have become much smaller. Some mitochondria in some epithelial cells are swollen and have clear matrices and distorted cristae. The shelves become horizontal and meet in the midpalate. Cells with degeneration bodies are seen in the epithelial seam. The seam undergoes autolysis and is replaced by mesenchyme. The morphological changes described, particularly in the mesenchyme, may play an important role in determining the effect of various teratogens at different stages of palatal development. The changes in both mesenchyme and epithelial cells in the later stages may constitute part of the process of preparing shelves for fusion as postulated by Pourtois ('66).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051300404
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  • 2
    Electronic Resource
    Electronic Resource
    Crystallization kinetics of dilute polyethylene solutions (1970)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 8 (1970), S. 869-882 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The crystallization kinetics of a high molecular weight fraction of linear polyethylene was studied in dilute solutions of p-xylene, n-hexadecane, and decalin by dilatometric methods. For all solvents and temperatures, the experimental isotherms could be quantitatively described by the Avrami formulation for the complete transformation. This result is unique in the realm of polymer crystallization, since marked deviations from this theory are usually observed in more concentrated systems. The Avrami exponent is found to be n = 4 in all cases. The temperature coefficients of the rate constants are indicative of a nucleation controlled process. The data fit either a two-dimensional or three-dimensional nucleation mode, and a discrimination can not be made between these two cases. The interfacial free energies are found to be independent of the solvent medium. It is also shown that, irrespective of the type of nucleation control governing the kinetics, the same type governs the crystallite thickness of the lamella-like crystals that are formed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1970.160080604
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  • 3
    Electronic Resource
    Electronic Resource
    Colony-forming cells in organ cultures of embryonal liver (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 75 (1970), S. 163-165 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Livers from 17- to 20-day CBA mouse embryos were maintained for three weeks in organ culture. During this period, hematopoiesis continued; morphologically recognizable cells were identified until day 24 and hematopoietic cells with colony forming ability were present until day 23. The method appears to hold promise for studies of hematopoietic differentiation in vitro.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040750205
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  • 4
    Electronic Resource
    Electronic Resource
    The occurrence of doubly-charged ions in the mass spectra of aromatic amine derivatives (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1970), S. 237-240 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This paper describes the mass spectra of some di-trimethylsilyl derivatives of aromatic amines. Numerous doubly-charged ions of low relative intensity are found in all spectra. An intense doubly-charged ion is found at m/e [M - 30]/2, whereas the singly-charged counterpart is very small in all cases.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210040127
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  • 5
    Electronic Resource
    Electronic Resource
    Mass spectrometry of the trimethylsilyl derivatives of amino-hydroxy, dihydroxy and dicarboxydiphenyls (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1970), S. 563-569 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A mass spectrometric study of the trimethylsilyl derivatives of a group of amino-hydroxy, dihydroxy and dicarboxydiphenyls has disclosed that these compounds produce a number of intense doubly-charged ions ([M - 30]/2, 5 to 27%), for which the singly-charged ions are low or absent. The derivative of 4,4′-dicarboxydiphenyl yields five such doubly-charged ions with relative intensities ⋝ 3%. The fragmentation pathways for this compound have been studied by the formation and mass spectrometry of the trimethylsilyl-d9 derivative.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210040157
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  • 6
    Electronic Resource
    Electronic Resource
    Etude de Steroïudes Fluorés par Spectrométrie de Masse - I: Dérivés des Fluoro-3 Androstenes-5(10) (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1970), S. 343-352 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A series of 6-β substituted derivatives of α and β 3-fluoro 17β-hydroxy (or acetoxy)-5(10) estrene were studied by mass spectrography. The influence of the substitution as also the stereochemistry of fluorine were discussed.
    Notes: Une série de dérivés substitués en 6β des fluoro-3α et β hydroxy ou acétoxy-17β estrénes-5(10) a été étudiée par spéctrographie de masse. L'influence de la substitution ainsi que la stéréochimie du fluor ont été discutées.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210040136
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  • 7
    Electronic Resource
    Electronic Resource
    Etude de Steroïdes fluorés par Spectrometrie de Masse - II. Dérivés des Fluoro-3 Androstenes-5 (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1970), S. 353-359 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The study of 19-substituted derivatives of α and β3-fluoro 17β acetoxy 5-androstene shows important differences in the fragmentation pattern according to the substitution and to the stereochemistry of the fluorine.
    Notes: L'étude de dérivés substitués en 19 des fluoro-3 α et β acétoxy-17β androsténe-5 montre des différences importantes dans la fragmentation selon la substitution et selon la stéréochimie du fluor.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210040137
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  • 8
    Electronic Resource
    Electronic Resource
    Reactions of aliphatic aldehydes under electron-impactOrganic Ions in the Gas Phase - XXIV. For paper XXIII in this series, see reference 22b. (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 689-707 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of hexanal, heptanal and nonanal variously labeled with deuterium confirm γ-hydrogen migration and β cleavage as the mechanism leading to [C2H4O]+· and [M — C2H4O]+·, although the data on the latter are complicated by contributions from other, related paths. In addition, they show that three other major primary decomposition products, [M — C2H4]+·, [M — H2O]+· and [C3H5O]+, all arise in large part by processes involving γ-hydrogen migration to the oxygen atom. The ethylene lost to yield the first of these products consists of the α and β methylene groups. The loss of ethylene most likely occurs by way of a cyclobutanol intermediate, which, via alternative reaction paths, may well contribute to the yields of the other two products as well. These findings further extend the range of parallelism between photochemical and electron-impact-induced reactions.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030602
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  • 9
    Electronic Resource
    Electronic Resource
    Loss of carbon dioxide in the mass spectra of some partially fluorinated β-diketonato iron chelates (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 1255-1258 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Evidence suggesting elimination of carbon dioxide as a decomposition path for tris(1-phenyl-4,4,4-trifluoro-1,3-butandionato) iron (III) [Fe(btac)3] and tris (1-thienyl-4,4,4-trifluoro-1,3, butandionato) iron (III) [Fe(ttac)3] is presented and discussed. A mechanism is proposed for this reaction. Other examples of CO2 elimination are observed for substituted phenyl Fe(btac)3, tris(1-cyclopropyl-4,4,4-trifluoro-1,3-butandionato) iron (III) and Co(III) (btac)3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210031005
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  • 10
    Electronic Resource
    Electronic Resource
    Uses of electron paramagnetic resonance in studying fracture (1970)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 8 (1970), S. 237-252 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The uses of electron paramagnetic resonance (EPR) in studying aspects of polymer fracture are discussed. The sensitivity of EPR is such that all phases of fracture are not amenable to investigation by these means. This paper attempts to define those areas where the authors' experience would indicate that success might or might not be expected. A discussion of the difference between the tensile fracture of drawn polymer fibers, in which strong signals are obtained, and cast and molded materials is given.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1970.150080122
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