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  • 1995-1999  (2)
  • 1965-1969  (3)
  • 1950-1954
  • Inorganic Chemistry  (3)
  • Life and Medical Sciences  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The in vitro response of thymic lymphocytes of the pig to phytohemagglutininThis work was aided by Pennsylvania Plan Funds, grant FR-00120-01 from the Division of Research Facilities and Resources, and by U.S.P.H.S. grant 5T1 Ca-5097.The work was performed at the interdisciplinary cancer research facilities of the school of veterinary medicine. (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 67 (1966), S. 285-299 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The response of thymic lymphocytes of the pig to phytohemagglutinin was studied with H3 thymidine in cultures, from 0-72 hours. At the beginning of the culture period 6-18% of lymphocytes were in DNA synthesis. during the first 24 hours a sharp decrease in the number of DNA synthesizing cells was observed in both pha and control cultures, although pha cultures consistently showed small but significantly greater numbers of DNA synthesizing cells. this was followed by a definite peak in DNA synthesis and mitotic response of a minority of the cells in pha cultures between 48-54 hours, whereas in control cultures activity ceased. in addition, a small proportion of the progeny of initially DNA synthesizing medium sized lymphocytes was apparently stimulated by pha and found in mitosis by 48 hours.It was concluded that the thymus contains a fraction of lymphocytes, not in the mitotic cycle, which are capable of being transformed by pha to mitotic activity. the data also suggests some stimulation of cells already in the mitotic cycle.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040670209
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Difference between medullary and cortical thymic lymphocytes of the pig in their response to phytohemagglutininThis work was aided by Pennsylvania Plan Funds and U.S.P.H.S. grants FR-00120-02 and 5 TI Ca 5097.Most of this work was performed at the Interdisciplinary Cancer Research Facilities of the School of Veterinary Medicine. (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 68 (1966), S. 117-125 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Pig thymus tissue was cultured with organ culture techniques in the presence and absence of phytohemagglutinin in the culture medium. Morphologic and autoradiographic observations indicate that in the pig, lymphocytes capable of responding to phytohemagglutinin are located predominantly in the medulla of the thymus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040680206
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Die Ammonolyse von (NH4)2GeF6. Darstellung und Struktur von NH4[Ge(NH3)F5] (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1529-1534 
    Details
    ISSN: 0044-2313
    Keywords: Formation of NH4[Ge(NH3)F5] ; structure ; ammonolysis ; ir spectrum ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ammonolysis Reaction of (NH4)2GeF6. Synthesis and Structure of NH4[Ge(NH3)F5](NH4)2GeF6 reacts with ammonia to yield NH4[Ge(NH3)F5] at 280°C. The reaction path was elucidated by in situ time and temperature resolved X-ray powder diffraction. NH4[Ge(NH3)F5] crystallizes isostructurally to NH4[Si(NH3)F5] in the tetragonal space group P4/n (No. 85) with lattice constants a = 619.41(1) pm and c = 724.70(1) pm. The germanium atom is coordinated by five fluorine atoms and the nitrogen atom of the ammonia molecule. The ammonium cation is located on the Wyckoff position (2 a) in P4/n. The crystal structure is stabilized by extensive hydrogen bonding.
    Notes: (NH4)2GeF6 reagiert mit Ammoniak bei 280°C zu NH4[Ge(NH3)F5]. Der Reaktionsverlauf wurde in situ mit Hilfe der zeit- und temperaturaufgelösten Röntgenpulverdiffraktometrie verfolgt. Das so dargestellte NH4[Ge(NH3)F5] kristallisiert isostrukturell mit NH4[Si(NH3)F5] in der tetragonalen Raumgruppe P4/n (Nr. 85) mit den Gitterkonstanten a = 619,41(1) pm und c = 724,70(1) pm. Dabei ist das Germaniumatom verzerrt oktaedrisch von fünf Fluoratomen und dem Stickstoffatom des Ammoniakmoleküls koordiniert. Das Ammoniumion liegt auf der Tetraederpunktlage (2 a) in P4/n. Die Verbindung wird durch Wasserstoffbrückenbindungen stabilisiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976231010
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Kenntnis des Phosphorpentachlorids. Über die Reaktion von PCI5 mit aliphatischen Nitrilen (1969)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 367 (1969), S. 40-43 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The course of interactions betweens some aliphatic nitriles and PCI5 has been investigated by means of 31P—NMR spectroscopy. Phosphazo compounds are formed, and chlorination occurs. Three examples of cis-trans isomeric phosphazo compounds were found.
    Notes: Der Ablauf von Reaktionen einiger aliphatischer Nitrile mit PCI5 wurde mit Hilfe der 31P—KMR-Spektroskopie untersucht. In allen Fällen entstehen Phosphazoverbindungen; außerdem tritt Chlorierung ein. Drei Beispiele von cis-trans-isomeren Phosphazoverbindungen wurden gefunden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19693670106
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  • 5
    Electronic Resource
    Electronic Resource
    Zeit- und temperaturaufgelöste Röntgenpulverdiffraktometrie: Die Reaktion von (NH4)2SnF6 mit Ammoniak (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 617-623 
    Details
    ISSN: 0044-2313
    Keywords: Formation of Sn(NH3)2F4 ; ammonolysis ; thermal decomposition of (NH4)2SnF6 ; time and temperature resolved x-ray diffractometry ; in situ x-ray diffractometry ; solid state reactions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Time and Temperature Resolved in situ X-Ray Powder Diffractometry. The Reaction of (NH4)2SnF6 with AmmoniaThe thermal decomposition of (NH4)2SnF6 under an atmosphere of ammonia is reported. The complicated reaction paths were illucidated by time and temperature resolved in situ x-ray powder diffractometry. It is shown that this technique is a powerful tool to observe structural changes during reaction. It offers also a valuable access to thermodynamic and kinetic data for solid state and gas phase reactions. (NH4)2SnF6 decomposes under ammonia below room temperature to NH4F and amorphous SnF4 · x NH3. At a temperature of 80°C an intermediate product, (NH4)4SnF8, is formed, which decomposes at 140°C into (NH4)2SnF6 and NH4F. At 250°C (NH4)[Sn(NH3)F5] and Sn(NH3)2F4 are formed. The latter crystallises C-centered monoclinic with lattice constants a = 844.1(5) pm, b = 630.5(3) pm, c = 520.2(3) pm and b̃ = 114.02(7)°. At 330°C a further decomposition yields SnF2(NH2)2 with a C-centered monoclinic cell and lattice constants a = 1 069(7), b = 325.3(2), c = 504.8(3) pm and b̃ = 105.83(7)°. Finally above 500°C tin metal is formed.
    Notes: Der komplizierte Verlauf der Reaktion von NH3 mit (NH4)2SnF6 wird mit der zeit- und temperaturaufgelösten Röntgendiffraktometrie verfolgt. Dabei erweist sich diese Methode als ideale Technik, um Veränderungen in der Struktur während der Reaktion aufzuzeichnen und ebenfalls thermodynamische und kinetische Daten zu gewinnen. (NH4)2SnF6 zersetzt sich schon bei 25°C unter trockenem NH3-Gas zu NH4F und einem röntgenamorphen Ammoniakat SnF4 · x NH3. Ab 80°C bildet sich (NH4)4SnF8 als Zwischenprodukt, das sich ab 140°C wieder in (NH4)2SnF6 und NH4F zersetzt. Bei 250°C entstehen NH4[Sn(NH3)F5] und Sn(NH3)2F4. Letzteres kristallisiert monoklin C-zentriert mit den Gitterkonstanten a = 844,1(5) pm, b = 630,5(3) pm, c = 520,2(3) pm und b̃ = 114,02(7)°. Ab 330°C erhält man SnF2(NH2)2. Aus dem Pulverdiffraktogramm ergibt sich eine C-zentrierte monokline Elementarzelle mit a = 1 069(7), b = 325,3(2), c = 504,8(3) pm und b̃ = 105,83(7)°. Bei noch höheren Temperaturen erfolgt die Zersetzung zu Zinn.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210419
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