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  • 1
    Electronic Resource
    Electronic Resource
    Copper as an electron trap in GaAs0.6P0.4 (1994)
    Springer
    Applied physics 59 (1994), S. 245-251 
    Details
    ISSN: 1432-0630
    Keywords: 71.00 ; 61.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An electron trap having an energy level of 0.14 eV from the conduction band edge was found in the bulk of copper-diffused VPE-grown n-GaAs0.6P0.4 by conventional DLTS measurements and by pulse-duration dependent capacitance amplitude measurements. The capture cross section at room temperature is about 1.0×10−21 cm2 and has a weak temperature dependence. These properties are attributed to a non-repulsive center having a capturing mechanism which involves multiphonon emission processes with hardly any lattice relaxation. Evolution of the spatial distributions of the traps with time under junction electric field were studied. The results suggest that the trap is positively charged and has a high diffusivity under electric field. The center can thus be identified as positively charged interstitial copper ion rather than some form of copper complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348227
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Castleman disease with renal amyloidosis: imaging findings and clinical significance (1995)
    Springer
    Abdominal imaging 20 (1995), S. 376-378 
    Details
    ISSN: 1432-0509
    Keywords: Amyloidosis ; Hamartoma ; Kidney ; Computed tomography ; Ultrasound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report two cases of renal amyloidosis associated with mesenteric and mediastinal Castleman disease of plasma cell type. Computed tomographic (CT) scan revealed a mesenteric mass with multiple nodal enlargement in one patient and a right paratracheal mass with irregular central calcifications in the second patient. Renal ultrasonography (US) showed increased echogenicity of the renal parenchyma with prominent medullas. Doppler waveform obtained in the kidney associated with mesenteric disease showed complete absence of diastolic flow signal, although it was normal in the patient with mediastinal disease. Recognition of Castleman disease as the cause of renal amyloidosis and the understanding of CT and US findings of this entity are important for the management, as well as its diagnosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00203376
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrogen control in Pseudomonas aeruginosa: A role for glutamine in the regulation of the synthesis of NADP-dependent glutamate dehydrogenase, urease and histidase (1981)
    Springer
    Archives of microbiology 128 (1981), S. 398-402 
    Details
    ISSN: 1432-072X
    Keywords: Nitrogen control ; Glutamate dehydrogenase ; Urease ; Histidase ; Glutamine auxotrophs ; Glutamine synthetase ; Pseudomonas aeruginosa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In Pseudomonas aeruginosa the formation of urease, histidase and some other enzymes involved in nitrogen assimilation is repressed by ammonia in the growth medium. The key metabolite in this process appears to be glutamine or a product derived from it, since ammonia and glutamate did not repress urease and histidase synthesis in a mutant lacking glutamine synthetase activity when growth was limited for glutamine. The synthesis of these enzymes was repressed in cells growing in the presence of excess glutamine. High levels of glutamine were also required for the derepression of NADP-dependent glutamate dehydrogenase formation in the glutamine synthetase-negative mutant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00405920
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  • 4
    Electronic Resource
    Electronic Resource
    Regulation of amidase formation in mutants from Pseudomonas aeruginosa PAO lacking glutamine synthetase activity (1982)
    Springer
    Archives of microbiology 131 (1982), S. 344-346 
    Details
    ISSN: 1432-072X
    Keywords: Amidase ; Nitrogen control ; Glutamine synthetase ; Pseudomonas aeruginosa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The formation of amidase was studied in mutants from Pseudomonas aeruginosa PAO lacking glutamine synthetase activity. It appeared that catabolite repression of amidase synthesis by succinate was partially relieved when cellular growth was limited by glutamine. Under these conditions, a correlation between amidase and urease formation was observed. The results suggest that amidase formation in strain PAO is subject to nitrogen control and that glutamine or some compound derived from it mediates the nitrogen repression of amidase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00411183
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    Paper (German National Licenses)
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