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  • 1
    Electronic Resource
    Electronic Resource
    Tooth replacement in the red-backed salamander, plethodon cinereusThis research was supported by grant GB 17112 from the National Science Foundation. (1971)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 134 (1971), S. 259-269 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The developmental cycle of the teeth in Plethodon cinereus is analyzed on morphological grounds using alizarin preparations. All the stages in development do not occupy the same proportion of the life cycle time. Functional teeth and germs at an early stage in development occupy a large proportion of the life cycle time, whereas the processes of tooth shedding and ankylosis occur very quickly. The time during which any locus does not bear a functional tooth, and is therefore a non-functional locus, is reduced to a minimum. P. cinereus has a basic pattern of tooth replacement which is consistent with Zahnreihen which are 2.0 tooth spaces apart. Variations in the replacement pattern are common and these are produced by relatively small fluctuations in the spacing of the Zahnreihen around the „mean„ of 2.0. Localized disturbances which produce breaks in the replacement pattern and cause waves to cross also occur. These may be due to the failure of tooth germs to develop, the fusion of tooth germs, or may be the result of the inherent variability in a complex biological system. This variability causes individual tooth germs to develop too slowly or too quickly and hence assume an „abnormal“ position thus causing breaks in the replacement pattern. Tooth replacement may be controlled by an intra-local mechanism(s) rather than by stimuli which travel along the jaw.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051340302
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  • 2
    Electronic Resource
    Electronic Resource
    Comparative observations on the morphology of the mammalian periovarial sac (1972)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 136 (1972), S. 247-254 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The interspecific variation in the positional and mesenteric relationship of the mammalian oviduct to the ovary observed among 41 species is summarized by distinguishing eight morphological types of relationship. The recognition of types is based on wide species differences in: the position of the oviduct with reference to the mesosalpinxal fold and ovary; the extent to which oviducal mesenteries enclose the ovary in a periovarial sac; the degree of closure and method of formation of the peritoneal opening to the periovarial sac; and the morphology of the oviduct.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051360208
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  • 3
    Electronic Resource
    Electronic Resource
    Physicochemical processes for water quality control, Walter J. Weber, Jr. (with eight contributors), Interscience, New York (1972). 640 pages. $19.95 (1973)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 19 (1973), S. 413-413 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690190245
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  • 4
    Electronic Resource
    Electronic Resource
    Kristallchemische Studien an Seltenerd-Dihalogeniden. Die Kristallstruktur von Ytterbium(II)-chlorid, YbCl2Professor Georg Brauer zum 65. Geburtstage gewidmet (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 45-55 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystallorgraphic Studies on Rare-Earth Dihalides. The Crystal Structure of Ytterbium (II) -chloride, YbCl2Using 452 reflexions collected on an automatic two-circle diffractometer with MoKα radiation the structure of YbCl2 was refined to a residual R = 0.025. The structural parameters of YbCl2 are in good agreement with those of SrI2. This is to be expected if the radius ratio is accepted as the main structural principle. The geometrical details of the coordination polyhedra around the sevenfold coordinated Yb2+ ion and the three- and fourfold coordinated Cl- ions are discussed in short. It is shown that the calculated vibrational parameters are physically relevant.
    Notes: Für Ytterbium(II)-chlorid wurde mit Hilfe von 452 Einkristallinterferenzen, die auf einem automatischen Zweikreisdiffraktometer mit MoKα-Strahlung gemessen wurden, eine Strukturverfeinerung bis zu einem Zuverlässigkeitsindex R = 0,025 durchgeführt. Die strukturellen Parameter von YbCl2 stimmen weitgehend mit denjenigen von SrJ2 überein. Dieser Befund ist plausibel, wenn man den Ionenradienquotienten als Strukturargument gelten läßt. In einer kurzen Diskussion werden kristallchemische Details der Koordinationspolyeder des siebenfach koordinierten Yb2+-Ions und der drei- bzw. vierfach koordinierten Cl--Ionen besprochen. Ferner wird gezeigt, daß die eingeführten anisotropen Temperaturfaktoren physikalisch relevant sind.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030106
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  • 5
    Electronic Resource
    Electronic Resource
    Über Pentafluorphenylthio-Metallkomplexe (1970)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 375 (1970), S. 231-237 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The compounds M(CO)5 · THF (M = Cr, Mo, W) react with sodium mercaptide, NaSR (R = C6F5, C6H5, C2H5), to give the mercapto-pentacarbonylmetallate anions [M(CO)5 · · SR]-. The preparation of some pentafluorophenylthio complexes, e. g. [(C6H5)3P]2MSC6F5(M = Cu, Ag, Au), [(C6H5)3P]2Hg(SC6F5)2, is reported.
    Notes: Die Mercapto-pentacarbonylmetallat-Anionen [M(CO)5SR]- (M = Cr, Mo, W; R = C6F5, C6H5, C2H5) entstehen durch Umsetzung von M(CO)5THF und Natriummercaptid. Darstellung und Eigenschaften einiger phosphinhaltiger Pentafluorphenyltio-Komplexe von Kupfer(I), Silber(I), Gold(I), Kobalt(II) und Quecksilber(II) werden beschrieben.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19703750304
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Kristallchemie der Ytterbium(II)-Halogenide YbCl2 und YbBr2 (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 386 (1971), S. 221-228 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal data and the structure types of the ytterbium dihalides YbCl2 and YbBr2 have been determined by the usual X-ray methods using single crystals. YbCl2 crystallizes with the orthorhombic space group Pbca and the lattice dimensions a = 13.18 Å, b = 6.96 Å, c = 6.70 Å. It is proved to be isostructural with SrI2. the structure of which has recently been determined. DyCl2 and TmCl2, of which only powder diagrams exist for the present, are most likely to have the same crystal structure. YbBr2 (orthorhombic space group Pnnm, a = 6.63 Å, b = 6.93 Å. c = 4.37 Å) crystallizes with the CaCl2 arrangement which may be described as a slight distortion of the rutile structure. Some aspects of the crystal chemistry of all four ytterbium dihalides are summarized in a short discussion.
    Notes: Unter Verwendung von Einkristallen der Ytterbium(II)-Halogenide YbCl2 und YbBr2 wurden nach üblichen röntgenographischen Verfahren die Kristalldaten abgeleitet und die Strukturtypen bestimmt. YbCl2 kristallisiert rhombisch mit den Gitterkonstanten a = 13,18 Å, b = 6,96 Å. c = 6,70 Å (Raumgruppe Pbca) und läßt sich dem erst vor kurzem aufgeklärten SrJ2-Typ zuordnen. Höchstwahrscheinlich gehören auch DyCl2 und TmCl2. von denen bisher nur Pulverdiagramme vorliegen. dem gleichen Strukturtyp an. YbBr2, das ebenfalls rhombisch kristallisiert (a = 6,63 Å. b = 6,93 Å, c = 4,37 Å, Raumgruppe Pnnm), kann dem CaCl2-Typ zugeordnet werden, der seinerseits durch eine geringfügige Verzerrung aus dem Rutil-Typ hervorgeht. In einer kurzen Übersicht wird die Kristallchemie aller vier Ytterbium(II)-Halogenide zusammenfassend diskutiert.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713860214
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  • 7
    Electronic Resource
    Electronic Resource
    Polymerisationsenthalpie der ringöffnenden polymerisation von cyclopenten (CPE) zu trans-polypentenamer (TPR)Herrn Direktor Dr. W. Graulich zum 60. Geburtstag gewidmet (1972)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 27 (1972), S. 29-35 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The enthalpy in the ring-cleavage polymerization of liquid cyclopentene to solid trans-polypentenamer (TPR) was calculated to be 4.2 kcal/mole; in the polymerization of liquid cyclopentene to solid cis-polypentenamer it was found to be 3.2 kcal/mole. The value of 4.5 kcal/mole determined calorimetrically in the polymerization of cyclopentene to trans-polypentenamer with a trans content of 65% agrees well with the calculated values.
    Notes: Für die Polymerisationsenthalpie der ringöffnenden Polymerisation von flüssigem Cyclopenten zu festem trans-Polypentenamer (TPR) wurde ein Wert von 4,2 Kcal/Mol errechnet; für die Polymerisation des flüssigen Cyclopentens zu festem cis-Polypentenamer ergibt die Berechnung eine Wert von 3,2 Kcal/Mol. Der kalorimetrisch bestimmte Wert von 4,5 Kcal/Mol für die Polymerisation von Cyclopenten zu trans-Polypentenamer mit einem trans-Gehalt von 65% stimmt mit den berechneten Werten gut überein.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1972.050270102
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Reaktion von Hydrido-Platin(II)-Komplexen mit organischen Aziden: Amido-Komplexe (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 583-589 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Hydrido-Platinum(II) Complexes with Organic Azides: Amido ComplexesThe reaction of the hydrido-platinum complexes (R3P)2Pt(X)H (R = C2H5, C6H5; X = C1, NCO, N3, CN) with organic azides R'N3 (R' = C6H5, C6H5CO, C6H5SO2, p-O2N-C6H4, CO2C2H5 a. o.) afford the air stable, monomeric amido compounds (R3P)2Pt(X)NHR′, which are characterized by their infra red spectra. A possible mechanism of this reaction is discussed.
    Notes: Bei der Umsetzung der Hydrido-Platinkomplexe des Typs trans-(R3P)2Pt(X)H (R = C2H5, C6H5; X = Cl, NCO, N3, CN) mit organischen Aziden R′N3 (R' = C6H5, C6H5CO, C6H5SO2, p-O2N-C6H4, CO2C2H5 u. a.) entstehen die luftstabilen monomeren Amido-Komplexe (R3P)2Pt(X)NHR', die durch ihre IR-Spektren charakterisiert werden. Ein möglicher Reaktionsmechanismus wird diskutiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030229
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  • 9
    Electronic Resource
    Electronic Resource
    Kernresonanzspektroskopische Untersuchungen an Bor-Verbindungen, IV. 14N-Kernresonanzstudien an einfachen Amino-boranen (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 2883-2897 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: n.m.r. Investigations on Boron Compounds, IV. 14N-n.m.r. Studies on Simple Amino BoranesChemical shift data δ14N and line width at half peak height for a considerable number of amino boranes of the types B(NR2)3, B(NHR)3, R'B(NR2)2, R'B(NHR)2, R'2BNR2, R2'BNHR, R2BNH2, (R2'B)2NR, some hydrazino boranes and dialkylamino halogeno boranes are reported and discussed in connection with the δ11B data of these compounds. A decrease in shielding of the 14N nucleus is observed with increasing BN bond order. Neighbour anisotropy effects as exerted by the heavier halogens add to this trend in the shielding.
    Notes: Chemische Verschiebungen δ14N und Halbhöhenbreiten zahlreicher Amino-borane des Typs B(NR2)3, B(NHR)3, R'B(NR2)2, R'B(NHR)2, R'2BNR2, R2'BNHR, R2BNH2, (R2'B)2NR sowie einiger Hydrazinoborane und Dialkylamino-halogenborane werden mitgeteilt und im Zusammenhang mit δ11B-Werten vergleichend diskutiert. Es ergibt sich eine mit zunehmender BN-Bindungsordnung fallende Abschirmung des 14N-Kernes. Nachbargruppen-Anisotropie-effekte, insbesondere der schweren Halogene, verstärken diesen Trend.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050912
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  • 10
    Electronic Resource
    Electronic Resource
    Platin(II)-Komplexe mit aktivierten Aminosäureestern und Reaktionen am N-geschützten Liganden (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 1781-1788 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Platinum(II) Complexes with Activated Amino Acid Esters and Reactions of the N-Protected LigandsThe compounds trans-X2Pt(NH2CH2CO2H)2 (X=Cl, Br) yield with substituted phenols and dicyclohexylcarbodiimide as coupling agent complexes 1 and 2 with activated amino acid ester ligands. Reaction of these N-coordinated ligands with nucleophiles, e. g. NH3, amines, glycine esters, leads to a number of derivatives. In these reaction platinum(II) acts as N-terminal protecting group.
    Notes: Die Verbindungen trans-X2Pt(NH2CH2CO2H)2 (X=Cl, Br) setzen sich mit substituierten Phenolen und Dicyclohexylcarbodiimid als Kupplungsreagens zu Komplexen 1 und 2 mit aktivierten Aminosäureestern um. Durch Reaktion an diesen N-koordinierten Liganden mit Nucleophilen, wie NH3, Aminen, Glycinestern, wird eine Reihe von Derivaten erhalten. Bei diesen Reaktionen wirkt Platin(II) als N-terminale Schutzgruppe.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060612
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