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  • Atomic, Molecular and Optical Physics  (7)
  • Micromonospora  (1)
  • myxobacteria  (1)
  • selective isolation  (1)
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Keywords
  • 1
    Electronic Resource
    Electronic Resource
    The selective isolation ofMicromonospora from soil by cesium chloride density gradient ultracentrifugation (1986)
    Springer
    Journal of industrial microbiology and biotechnology 1 (1986), S. 181-186 
    Details
    ISSN: 1476-5535
    Keywords: Microbial isolation ; Actinomycetes ; Micromonospora
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A novel method is described for the selective isolation ofMicromonospora from mixed microbial populations in soil. Microorganisms were released from soil by sonication, and the bulk of the soil debris was discarded by low-speed centrifugation. The supernatant microbial suspension was concentrated and applied to a continuous, linear (1.1–1.6 g/ml) gradient of CsCl which was then centrifuged at high speed. The gradient was fractionated, and each fraction was diluted and plated on a medium devoid of antimicrobial agents.Micromonospora were found in the 1.35–1.42 g/ml density band. Occasionally,Bacillus species were also obtained in this density range, but other nonfilamentous bacteria or actinomycetes were usually not observed. This technique allowed the isolation of portions of the soilMicromonospora population which were suppressed by conventional isolation techniques employing heat and antibiotics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01569270
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  • 2
    Electronic Resource
    Electronic Resource
    A method for the selective isolation ofMyxococcus directly from soil (1996)
    Springer
    Journal of industrial microbiology and biotechnology 16 (1996), S. 230-236 
    Details
    ISSN: 1476-5535
    Keywords: myxobacteria ; Myxococcus ; soil ; selective isolation ; direct isolation method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A new method is described for the selective isolation of species ofMyxococcus directly from soil by dilution plating. The method involves suppression of competing microorganisms with antibiotics combined with air drying and wet heat treatment of soils. Fungi were eliminated by supplementing the plating medium with cycloheximide and nystatin. Non-sporulating bacteria were controlled by air drying soils and then heating aqueous soil dilutions for 10 min at 56°C. The predominant sporulating bacteria in soil,Streptomyces andBacillus, were suppressed by adding either tiacumicin B, ristocetin or vancomycin to the medium. Swarming ofMyxococcus colonies was controlled with a casein digest-yeast extract plating medium (CY-C10 agar). Ultrasound treatment of soil suspensions gave the highest number ofMyxococcus colonies in the soils studied, but these cultures could be recovered without ultrasound. Strains ofMyxococccus fulvus, M. xanthus, M. coralloides, M. stipitatus andM. virescens were isolated from soil using this technique. Soils examined yielded one or twoMyxococcus species per sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570026
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  • 3
    Electronic Resource
    Electronic Resource
    The dirac second-order equation and an improved quasirelativistic theory of atoms (1986)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 30 (1986), S. 809-819 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A transformation decoupling the Dirac second-order equations for the large and small components of the radial atomic wavefunction has been derived. The decoupling procedure is exact for one-electron atoms and approximate, though very accurate, for a general case of an atomic spherical potential. Its connection with the quasirelativistic theory of atoms has been discussed. The transformation has been applied to deriving an optimized quasirelativistic equation and to establishing relations between the quasirelativistic and the Dirac wavefunctions. Formulas resulting from these considerations allow improvement of quasirelativistic expectation values of operators so that the error, relative to the Dirac values, is reduced by a factor of 10.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560300610
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  • 4
    Electronic Resource
    Electronic Resource
    Ground-state energies of closed-shell atomsSponsored by the Polish Academy of Sciences, Contract No. MR.I.5. (1985)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 28 (1985), S. 27-37 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ground-state energies of He, Be, and Ne isoelectronic series have been calculated. The Dirac-Hartree-Fock energy values have been corrected by adding Breit, vacuum polarization, self-energy, nuclear mass, and electron correlation corrections. The resulting energies are compared with the experimental values. As a result, an estimate of the correlation-relativistic cross-term energy is obtained. The effect, for large-Z atoms, proves to be quite substantial.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560280104
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  • 5
    Electronic Resource
    Electronic Resource
    Quasirelativistic methodsSponosored by the Polish Academy of Sciences, project No. MR.I.5 (1985)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 28 (1985), S. 741-756 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A comparative study of quasirelativistic equations used in atomic structure calculations has been performed. A uniform derivation of all the equations is presented, and some of their specific features are discussed in detail. Electron density distributions, orbital energies, and expectation values of rn obtained with different methods are compared with the ones resulting from the Schrödinger and Dirac equations. The most accurate are found to be the equations of Wood and Boring and of Barthelat, Pelissier, and Durand. (They reproduce almost exactly the Dirac electron densities and expectation values.) The simplest, though least accurate, equation is proposed by us. It gives the relativistic energy corrections with about 6% accuracy and retains exactly the form of the nonrelativistic Schródinger equation. Consequently, its application in analytical SCF-CI calculations does not require any additional integral calculation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560280609
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  • 6
    Electronic Resource
    Electronic Resource
    Spectral density distribution of an N-electron Hamiltonian in a finite-dimensional and spin-adapted model space (1995)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 56 (1995), S. 71-79 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Expressions for moments of spectral density distributions of a many-electron Hamiltonian defined in a finite-dimensional, antisymmetric, and spin-adapted model space (as, e.g., a full configuration interaction space) are derived. The moments are expressed in terms of combinations of two-electron integrals corresponding to a symmetric (a two-electron singlet) and antisymmetric (two-electron triplet) two-electron wave functions. A diagrammatic approach based on Hugenholtz-type diagrams and leading to a simple and universal classification scheme of the terms appearing in the expression for a specific moment is proposed. © 1995 John Wiley & Sons, Inc.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560560202
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  • 7
    Electronic Resource
    Electronic Resource
    Statistical properties of spin-adapted reduced Hamiltonians (1994)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 51 (1994), S. 487-497 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The first two moments of the spectral density distributions of the second- and the third-order spin-adapted reduced Hamiltonian (SRH) matrices have been calculated and compared with the corresponding quantities describing the full configuration interaction (FCI) Hamiltonian matrix. It has been demonstrated that the differences between the SRH and FCI spectral density distributions sharply increase with increasing difference between the number of electrons and the order of SRH. © 1994 John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560510615
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  • 8
    Electronic Resource
    Electronic Resource
    Relativistic quantum defect orbital calculations of singlet-singlet transitions in the zinc and cadmium isoelectronic sequences (1993)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 48 (1993), S. 385-397 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Relativistic quantum defect orbital (RQDO) calculations, with and without explicit account for corevalence correlation, have been performed on several electron transitions in the zinc and cadmium isoelectronic sequences, which are of interest in astrophysics and fusion plasma research. A comparative study with other theoretical results and experimental measurements has also been carried out. © 1993 John Wiley & Sons, Inc.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560480839
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  • 9
    Electronic Resource
    Electronic Resource
    Quantum defect orbital study of electron transitions in rydberg molecules. I. Triatomic hydrogen (1993)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 48 (1993), S. 723-729 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Results of a pilot study on the applicability of the quantum defect orbital method for describing electronic transitions between molecular Rydberg states are reported. Oscillator strengths and Einstein emission coefficients for the triatomic hydrogen molecule have been calculated. The results are in good agreement with the data derived from more sophisticated theoretical approaches. © 1993 John Wiley & Sons, Inc.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560480864
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