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  • Walter de Gruyter GmbH  (3)
  • Biology  (3)
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  • Walter de Gruyter GmbH  (3)
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  • 1
    Online Resource
    Online Resource
    Metallomethane, VI [1]. Kristallstruktur von Tetrakis(chloroquecksilber)methan-Dimethylsulfoxid C(HgCl) 4 · (CH 3 ) 2 SO / Metallomethanes, VI [1]. Crystal Structure of Tetrakis(chloromercuri)methane-Dimethylsulfoxide C(HgCl) 4 · (CH 3 ) 2 SO
    Walter de Gruyter GmbH ; 1983
    In:  Zeitschrift für Naturforschung B Vol. 38, No. 3 ( 1983-3-1), p. 357-364
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 38, No. 3 ( 1983-3-1), p. 357-364
    Abstract: The tetrakis (halomercuri) methane dimethylsulfoxide solvates C(HgX) 4 · DMSO (X = Cl and Br) have been prepared. - The crystal structure of the chloro compound C(HgCl) 4 · DMSO has been determined (R = 0.0611 and Rw = 0.0562). The compound crystallizes in space-group P2 1 /n with a = 1854(1) pm, b = 727.3(5) pm, c = 1049.1(6) pm, β = 94.82(3)°, Z = 4; d c = 4.873 g·cm -3 , d 0 = 4.51 g-cm -3 . - The C(HgCl) 4 molecules have C-Hg bond lengths in the range 201.4(26) to 209.9(27) pm (average 207.0 pm), and Hg-Cl bonds between 231.4(9) and 234.2(9) pm (average 233.2 pm). The bond angles Hg-C-Hg vary from 107.3(3) to 111.7(4)° (average 109.5°), and the angles C-Hg-Cl are found within the limits 172.2(24) and 178.3(25)° (mean 174.3°). DMSO molecules (S-O bond 148.6(23)pm) are coordinated via oxygen to two Hg atoms of one C(HgCl) 4 molecule and to one Hg atom of a neighbouring C(HgCl) 4 molecule forming two bifurcated bridges in a dimer [C(HgCl) 4 · DMSO] 2 ; two strong Cl→···Hg and two weak S→···Hg interactions also contribute to this pair formation. The dimeric units are arranged to layers in the planes (100) and (200), such that each C(HgCl) 4 molecule has six C(HgCl) 4 and two DMSO molecules as neighbours; with two C(HgCl) 4 molecules from each adjacent layer, each C(HgCl) 4 molecule achieves a total coordination number of ten. Depending on the van der Waals radius assumed for mercury a packing coefficient 0.640 ≤ k ≤ 0.691 is obtained. - Cryoscopy and vibrational spectrometry suggest monomeric, unperturbed tetrahedral C(HgX) 4 molecules in DMSO solutions.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-1983-0315
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1983
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 2
    Online Resource
    Online Resource
    Die Antennen von Calliphora als Anzeiger der Fluggeschwindigkeit
    Walter de Gruyter GmbH ; 1957
    In:  Zeitschrift für Naturforschung B Vol. 12, No. 3 ( 1957-3-1), p. 139-143
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 12, No. 3 ( 1957-3-1), p. 139-143
    Abstract: Ein Luftzug, der die Antenne von Calliphora erythrocephala trifft, löst im Antennennerv unregelmäßige Serien großer spike-ähnlicher Potentiale aus, deren Dichte mit wachsender Luftgeschwindigkeit zunimmt. Wenn die Arista statt durch einen Luftstrom mit dem Mikromanipulator nach hinten gedrückt wird, treten ähnliche Entladungen auf, jedoch nur während der Drehung des Funiculus in seinem vom Johnstonschen Organ kontrollierten Pedicellus-Gelenk. Ein konstanter Dauerausschlag des Funiculus wird von dichten Folgen kleinerer Impulse angezeigt, die ohne merkliche Veränderung lange Zeit anhalten. Luftschall bis zu einer Frequenz von 500 Hz erzeugt im Antennennerv regelmäßige Potentialserien, deren Frequenz von der Reizfrequenz und deren Höhe von der Schallintensität abhängt. Für Töne zwischen 150 und 250 Hz, also im Bereich der Flügelfrequenz von Calliphora, ist die Antenne kaum weniger empfindlich als das Menschenohr. In Verhaltens-Versuchen wird gezeigt, daß die Geschwindigkeit der frei fliegenden Calliphora von den Johnstonschen Organen gesteuert wird. Auch die „Schall“-Empfindlichkeit der Fliegenantenne scheint im Dienste dieser Aufgabe zu stehen: Infolge ihrer hohen Eigenfrequenz kann die Calliphora-Antenne mit einer Einstellzeit von nur 1 msec die durch jeden einzelnen Flügelschlag erzielte Beschleunigung gesondert anzeigen.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-1957-0301
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1957
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 3
    Online Resource
    Online Resource
    Model Reactions for the Degradation of DNA-4′ Radicals in Aqueous Solution. Fast Hydrolysis of α-Alkoxyalkyl Radicals with a Leaving Group in β-Position Followed by Radical Rearrangement and Elimination Reactions
    Walter de Gruyter GmbH ; 1982
    In:  Zeitschrift für Naturforschung C Vol. 37, No. 11-12 ( 1982-12-1), p. 1205-1227
    Details
    In: Zeitschrift für Naturforschung C, Walter de Gruyter GmbH, Vol. 37, No. 11-12 ( 1982-12-1), p. 1205-1227
    Abstract: α-Alkoxyalkyl radicals with a leaving group L = Cl or OCOCH 3 in β-position are produced by H-abstraction from the corresponding saturated substrates by · OH, SO · 4 - or (CH 3 ) 3 CO · radicals. From ESR spectroscopic observations it is concluded that in aqueous solution at pH 5 -9 the following fast hydrolysis reactions take place: The rate constants of these reactions and for the hydrolysis of CH 3 O-ĊH-CH 2 Cl are k ≥ 10 6 s -1 , whereas the rate constant for CH3O-ĊH-CH 2 OCOCH 3 was determined to be ≈ 2 × 10 3 s -1 at room temperature. The radicals with L = Cl cannot be scavenged by O 2 which fact leads to a value of k ≥ 2 × 10 -7 s -1 . α-Alkoxyalkene radical cations are assumed as intermediates in the hydrolysis reactions. The radicals with L = OCOCH 3 and the radical CH 3 O--ĊH-CH 2 Cl are observable in acetone solution ESR spectroscopically. In aqueous solution at pH below 3 proton catalyzed reactions are observed by ESR spectroscopy: Radicals resulting from H-abstraction at the CH 3 O-groups of the substrates or at the 5-positions of the cyclic ethers are also observed. The ESR parameters and the pH-ranges of existence of the above radicals are given. Support of the reported reactions comes from quantitative analysis of stable products such as H + , Cl - or CH 3 OH after 60 Co-γ-irradiation of N 2 O saturated aqueous solutions of the substrates. The behaviour of the radicals is used as a model to describe a modified version of the degradation of DNA-4′ radicals in aqueous solution in the absence of oxygen.
    Type of Medium: Online Resource
    ISSN: 1865-7125 , 0939-5075
    URL: Article
    DOI: 10.1515/znc-1982-11-1223
    RVK:
    WA 15000
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1982
    detail.hit.zdb_id: 2078107-6
    SSG: 12
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