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  • Atomic, Molecular and Optical Physics  (2)
  • Acid phosphatase  (1)
  • Key words: Asparagine  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Phosphoenolpyruvate carboxykinase plays a role in interactions of carbon and nitrogen metabolism during grape seed development (1999)
    Springer
    Planta 210 (1999), S. 9-18 
    Details
    ISSN: 1432-2048
    Keywords: Key words: Asparagine ; Nitrogen metabolism ; Phosphoenolpyruvate carboxykinase ; Seed development ; Vitis (seed development)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Phosphoenolpyruvate carboxykinase (PEPCK) was shown to be present in a range of developing seeds by measurement of its activity and by immunoblotting. Its function was investigated during grape (Vitis vinifera L.) seed development. The maximum abundance of PEPCK coincided with the deposition of storage reserves. At this stage of development, immunohistochemistry showed that PEPCK was very abundant in a layer of cells located at the boundary of developing storage tissues and in the chalaza (close to the termination of the vascular supply to the seed) and was also present in the palisade layer of the seed coat (the inner layer of the outer integument). Earlier in development PEPCK was also present in the developing palisade layer and in the inner region of the nucellus which surrounds the developing endosperm. At later stages of development, PEPCK was located in the outer region of the endosperm. However, PEPCK was present in the phloem of the seed at all stages of development. Feeding of asparagine to developing grape seeds led to a strong induction of PEPCK. We suggest that, in developing grape seeds, both the chalaza and palisade tissue may distribute imported assimilates from the vasculature to the developing storage tissues and that PEPCK may play a role in the metabolism of nitrogenous assimilates during their delivery from the vasculature to the storage tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250050648
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Fine structure and fluoride resistant acid phosphatase activity of electron dense sinusoid terminals in the substantia gelatinosa Rolandi of the rat after dorsal root transection (1974)
    Springer
    Experimental brain research 19 (1974), S. 529-544 
    Details
    ISSN: 1432-1106
    Keywords: Spinal cord ; Rolando substance ; Acid phosphatase ; Degeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Fluoride resistant acid phosphatase (FRAP) activity of the rat substantia gelatinosa Rolandi is confined to electron dense sinusoid terminals under normal conditions. Transection of dorsal roots or removal of dorsal root ganglia results in a rapid degeneration of more than half of the electron dense sinusoid axon terminals. First signs of degeneration ensue 20 hours after surgery; at the 24 hours state osmiophilic degeneration bodies develop that are translocated into glial elements in the course of the second postoperative day. At the same time, light microscopically visible FRAP-activity of the Rolando substance disappears. Electron histochemical investigations reveal that decreased enzyme activity is due to degeneration of FRAP-positive terminals. It is concluded that FRAP-positive terminals, representing the majority of electron dense sinusoids in the Rolando substance, are dorsal root collaterals; the origin of non-degenerating FRAP-negative electron dense terminals remains unknown for the time being.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236116
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    One-Parameter double-zeta atomic functions for the hartree-fock energies of helium isoelectronic sequence (1985)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 27 (1985), S. 559-565 
    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 double-zeta atomic functions are characterized by the nuclear charge z of the two-electron atomic system. The Hartree-Fock total energies and the corresponding orbital energies are calculated using various atomic wave functions for the helium isoelectronic sequence. The expectation values rn of various wave functions are also examined. It is found that the accuracy of our one-parameter double-zeta functions corresponds to the accuracy of the usual five-parameter double-zeta functions.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560270505
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  • 4
    Electronic Resource
    Electronic Resource
    The electronic transition energies of four alternative C60 molecules (1992)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 42 (1992), S. 1651-1657 
    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 low-lying allowed electronic transition energies of four alternative structures to the C60 cage molecule are examined. The bond turning transformation of Stone and Wales is used to generate new C60 structures with the symmetries C2v, D2h, and D6h. We have found that the C60 is indeed a truncated icosahedron as originally proposed, but the production of other alternative structures in specific experimental conditions is not excluded.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560420604
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    Paper (German National Licenses)
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