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  • 1
    ISSN: 1432-0983
    Keywords: Agaricus ; Plasmid-like DNAs ; Mitochondrial DNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two unique plasmid-like DNA components were localized in isolated mitochondria of the commercially important mushroom genus Agaricus: pEM (7.35 ± 0.15 kilobases) and pMPJ (3.65 ± 0.15 kilobases). These DNA moieties were linear; pEM possessed regions of terminal inverted repeated sequences. No homology was detected between pEM or pMPJ DNA and the nuclear or mitochondrial genomes. No homology existed between pEM and pMPJ. This suggests independent replication of pEM and pMPJ. Restriction endonuclease digests indicated that pEM consisted of two components (pEM1 and pEM2) with uniquely different restriction sites and copy number.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 111 (1980), S. 63-79 
    ISSN: 1434-4475
    Keywords: Chromium(III)complexes ; Iron(II)complexes ; Magnetic susceptibility measurements ; Mössbauer spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden Komplexe von Pyridin-2-aldoxim (Hpox) mit Fe(II) und Cr(III) vom Typ [Fe(Hpox)2 X 2] (X=Cl, Br, I, NCS), [Cr(Hpox)3]Cl3·3 H2O, [Cr(Hpox)2 X 2]ClO4 (X=F, Cl, Br) und [Cr(Hpox)2(H2O)2]Br3·H2O hergestellt. Charakterisierung und Diskussion von Geometrie und Bindungsverhalten in den Komplexen erfolgte auf Grund von analytischen Daten, Röntgen-Pulveraufnahmen, Elektronenanregungsspektroskopie, Infrarotspektroskopie, magnetischen Messungen undMössbauer-Spektroskopie.
    Notes: Abstract Complexes of pyridine-2-aldoxime (Hpox) with iron(II) and chromium(III) of type, [Fe(Hpox)2 X 2] (X=Cl, Br, I or NCS); [Cr(Hpox)3]Cl3·3 H2O; [Cr(Hpox)2 X 2]ClO4 (X=F, Cl or Br) and [Cr(Hpox)2(H2O)2]Br3·H2O were prepared and characterized by analytical X-ray powder diffraction, magnetism, vibrational (conventional and far-infrared) and electronic spectroscopy techniques. X-ray and electronic spectral data indicate that all the complexes except [Cr(Hpox)3]Cl3·3 H2O havetrans-pseudo-octahedral microsymmetry around the metal ion. Infrared spectral data indicate that the ligand, Hpox, behaves like a neutral ligand and coordinates to the metal ion through pyridine nitrogen atom and oxime nitrogen atom in all these complexes. The magnetic susceptibilities of chromium(III) complexes, measured over a temperature range 300–78 K, are independent of temperature whereas the magnetic moments of iron(II) complexes over a temperature range 300–20 K are dependent of temperature. The observed temperature dependence of magnetic moments of iron(II) complexes was used to evaluate the magnitude of orbital reduction factor,k, the low-symmetry distortion parameter, Δ, and the extent of reduction in spin-orbital coupling, λ. In all these iron(II) complexes the magnetic results indicate the presence of an orbitally non-degenerate,5B2g, ground state. Magnetically unperturbed and perturbedMössbauer spectra of iron(II) complexes at various temperatures have also been reported. Magnetically perturbedMössbauer spectra of iron(II) complexes at 4.2 K in an axial field of 60kGauss indicate that the principal component of electric field gradient tensor is positive and consistent with5B2g ground electronic state in a tetragonal (D 4h) local site symmetry.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 111 (1980), S. 1273-1285 
    ISSN: 1434-4475
    Keywords: Diffuse-reflectance spectra ; Iron(III) complexes ; Magnetic susceptibility ; Manganese(II) complexes ; Vibrational spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden Komplexe von Pyridin-2-aldoxim (HPOX) und 6-Methylpyridin-2-aldoxim (HMPX) vom Typ [Mn(HPOX)2 X 2], [Mn(HMPX)2 X 2], [Fe(HPOX)(POX)X 2] und [Fe(HMPX)(MPX)X 2] (X=Cl, Br, I, NO3, NCS, OA c;X 2=SO4) dargestellt. Die Diskussion erfolgt basierend auf Infrarot-spektroskopie (inklusive fernes IR), Messungen der magnetischen Suszeptibilität (Temp. bis zu fl. N2) undMössbauer-Spektroskopie.
    Notes: Abstract The vibrational (conventional and far-infrared) and diffuse-reflectance spectra in conjunction with magnetic susceptibility measurements over a temperature range down to liquid nitrogen temperature are reported and discussed for the complexes; [Mn(HPOX)2 X 2]; [Mn(HMPX)2 X 2]; [Fe(HPOX)(POX) X 2] and [Fe(HMPX)(MPX) X 2](whereHPOX=pyridine-2-aldoxime (C6H6N2O);POX=C6H5N2O;HMPX=6-Methylpyridine-2-aldoxime (C7H8N2O);MPX=C7H7N2O;X=Cl, Br, I, NO3, NCS, or OA c andX 2=SO4). On the basis of these physical studies a six-coordinated structure is suggested for the manganese(II) and iron(III) complexes.Mössbauer spectra, measured at room-temperature and liquid nitrogen temperature also indicated a six-coordinate geometry for iron(III) complexes.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Some copper(II) complexes of types [Cu3(L)3(OH)2](X) and [Cu3(L)3(OH)(SO4)] · 3 H2O (where L=qox, anion of quinoline-2-aldoxime (Hqox) or iqox, anion of isoquinoline-3-aldoxime (Hiqox) and X=Cl, Br, I, NO3, NCS or NCSe) were prepared and characterized by elemental analysis, molecular conductance, magnetic moment (300-77K) and spectral measurements. The complexes are highly antiferromagnetic and have S=1/2. A distorted square-pyramidal structure with CuN2O3 chromophore is proposed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Some copper(II) complexes of the types: Cu(HPPK)-(PPK)X, Cu(HMPK)(MPK)X (where HPPK = syn-phenyl-2-pyridylketoxime, HMPK = syn-methyl-2-pyridylketoxime and X = Cl−, Br−, I−, NO3 −, SCN− or SeCN−) Cu(HPPK)2SO4 3 H2O and Cu(HMPK)2SO4 · 3 H2O were synthesized and characterized by analysis, magnetic susceptibility, e.s.r., reflectance and i.r. spectral measurements. The spectral data suggest that Cu(HPPK)(PPK)X and Cu(HMPK)(MPK)X containcis square-coplanar [Cu(HPPK)(PPK)]+ and [Cu(HMPK)(MPK)]+ units respectively, linked by weakly coordinated anions, giving infinite polymeric highly distorted octahedral chain structures, whereas Cu(HPPK)2SO4 · 3H2O and Cu(HMPK)2SO4 · 3 H2O have acis distorted octahedral structure containing two ligand molecules of ketoxime and a bidentate sulphate group. The polycrystalline e.s.r. spectra suggest a distorted octahedral stereochemistry for the CuII ion involving a $$d_{x^2 - y^2 } $$ ground-state. By using e.s.r. and reflectance spectral data, the orbital reduction parameters, k11 and k1 were calculated and interpreted in terms of molecular orbital coefficients.
    Type of Medium: Electronic Resource
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