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  • metabolism  (2)
  • radical addition  (2)
  • 61.72.Cc  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Characterization of vacancy-related defects introduced into silicon during heat treatment by deep-level transient spectroscopy and gamma-ray diffraction techniques (1996)
    Springer
    Applied physics 62 (1996), S. 259-262 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 61.72.Cc ; 61.72.Ji ; 73.61.Cw
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Vacancy-related defects introduced into n-Si during annealing or aluminium diffusion at high temperature (1000–1250°C) have been studied. Different ambients (argon, nitrogen, vacuum and chlorine-containing atmosphere) were used to create a vacancy supersaturation during heat treatments. Three deep-level centers whose formation is governed by the presence of vacancies have been identified. They were characterized by the following temperature dependences of the thermal emission rate:e3 = 7.92 × 107 T 2 × exp(− 0.455/kT),e 5 = 2.64 × 106 T 2 × exp( − 0.266/kT),e 7 = 7.26 × 106 T 2 × exp (− 0.192/kT). The influence of different factors, such as heat-treatment conditions, concentration of oxygen and doping level in initial crystals, on center formation was studied. An asymmetric diffuseγ-ray scattering was observed near the surface of a crystal irradiated by thermal neutrons and annealed in a chlorine-containing atmosphere. This scattering is related to the formation of structural defects of the vacancy type. In the same region of the crystal, the concentration of the E7 center was one order of magnitude higher than that of other deep-level centers. Comparison of theγ-ray diffraction and deeplevel transient spectroscopy (DLTS) data suggests that the formation of the center occurs under the conditions of Si supersaturation with vacancies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01575091
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  • 2
    Digitale Medien
    Digitale Medien
    Bioavailability of dalargin and its metabolism when administered intranasally to rats (1988)
    Springer
    Bulletin of experimental biology and medicine 106 (1988), S. 968-970 
    Details
    ISSN: 1573-8221
    Schlagwort(e): dalargin ; opioids ; metabolism ; bioavailability
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00834651
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  • 3
    Digitale Medien
    Digitale Medien
    Electronegativity scheme for reactions involving radical addition to vinyl monomers (1992)
    Springer
    Russian chemical bulletin 41 (1992), S. 1750-1755 
    Details
    ISSN: 1573-9171
    Schlagwort(e): vinyl monomers ; radical addition ; reactivity ; correlation schemes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The concept of the apparent electronegativity of a reaction site has been introduced. This has been used to develop a new scheme for calculating the relative rate constants of addition of radicals with different structures to vinyl monomers. The parameters of the scheme are given for 40 reagents. The results of a comparison of calculated and literature rate constants of addition are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00863803
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  • 4
    Digitale Medien
    Digitale Medien
    Transition states in the reaction of radical addition to the vinyl double bond (1993)
    Springer
    Russian chemical bulletin 42 (1993), S. 640-644 
    Details
    ISSN: 1573-9171
    Schlagwort(e): vinyl monomers ; radical addition ; MO calculations ; transition states of reaction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The transition states for the addition of.CH3, CH3O.,.CCl3,.CF3, and HOO. radicals to the Cβ and Cα atoms of ethylene, propylene, styrerie, acrylonitrile, methyl acrylate, vinyl acetate, and vinyl- and vinylidene chlorides were calculated using the MNDO method. A satisfactory correlation between the heats of reaction and activation energies was found. The calculated coefficients of proportionality, 0.4–0.5, are twice as high as those in the Polyani—Semenov equation. The calculated heat of reaction of radical addition was shown to be as «strong» an index of reactivity as the calculated activation barrier.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00703996
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  • 5
    Digitale Medien
    Digitale Medien
    Distribution of a morphogenic peptide activating the head growth of hydra in rat organs following intravascular administration of3H-labeled peptide (1994)
    Springer
    Bulletin of experimental biology and medicine 118 (1994), S. 1162-1165 
    Details
    ISSN: 1573-8221
    Schlagwort(e): hydra head growth activator ; tissue and organ distribution ; pharmacokinetics ; metabolism
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract The organ distribution of radioactivity following intravascular bolus injection of3H-Lys-head growth activator in rats was studied. Two minutes after injection the renal level of radioactivity exceeded the blood level 7-fold; 80% of the total activity was bound with the blood cell membranes. An analysis of chemical derivatives of the labeled peptide in the plasma by means of reverse-phase high-performance liquid chromatography revealed the presence of several groups of radioactive metabolites with different hydrophilic properties. High-performance liquid chromatography of blood extracts obtained from samples taken 0.5, 1, 1.5, 2, 31, and 60 min after injection showed the transformation of initially hydrophobic head growth activator into more hydrophilic fragments. The3H-Lys-head growth activator-associated radioactivity could be reliably detected in the blood onl during the first two minutes after injection. The half-period of blood-to-organ distribution of3H-labeled head growth activator lasted less than 30 seconds.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02444613
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