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  • 1
    Digitale Medien
    Digitale Medien
    Enhancement of field-induced optical absorption by potential modification of coupled quantum well structures (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2892-2894 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A novel structure, in which the potential profile of the coupled quantum well system is slightly inclined, is proposed for lowering the electric field required to transform the coupled system to a set of uncoupled single quantum wells. Numerical calculations of absorption spectra of graded coupled quantum wells under an electric field and room-temperature photocurrent spectra of fabricated p-i-n diode samples confirm the above enhanced effect.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.104713
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  • 2
    Digitale Medien
    Digitale Medien
    Characterization of growth interruption interface by mobility profiling (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 2211-2215 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A mobility profiling technique using a field-effect transistor has been successfully applied to characterize the growth interruption interfaces of organometallic vapor-phase epitaxial Si-doped n-GaAs layers. The interface was formed by interrupting the supply of TMGa and SiH4 for certain lengths of time under a pressure of flowing AsH3. The 30-s interruption interface showed a decrease in the carrier concentration and an increase in the mobility, as obtained from the gate capacitance-voltage and transconductance-voltage characteristics. A quantitative analysis led us to a conclusion that the interface in question is not compensated by acceptor impurities or defects, in contrast with an easy conclusion usually deduced only from the carrier concentration profile, but has an effective reduction of Si doping level. A secondary-ion mass spectroscopic (SIMS) depth analysis of Si and C atoms supported the above-mentioned conclusion. The 60-s interruption, however, showed an extremely low drain current, which was caused by overcompensation of Si by C pileup at the interface, as confirmed from the SIMS depth profile. Thus, it was found that electrical compensation of the interface rapidly proceeds during 30–60-s interruption. The mobility profiling, therefore, provides a sensitive and powerful tool for growth interruption analysis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349465
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  • 3
    Digitale Medien
    Digitale Medien
    Purely gain-coupled distributed feedback semiconductor lasers (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1620-1622 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We propose a new distributed feedback (DFB) laser structure in which almost pure gain coupling can be embodied in principle, without sacrificing low threshold operation. An analysis of coupling coefficients has revealed the condition for canceling index-coupling component. Utilizing organometallic vapor phase epitaxy, we have fabricated GaAlAs/GaAs ridge waveguide distributed feedback lasers having this structure. Excellent single longitudinal mode oscillation independent of facet reflection has been obtained along with low threshold current. The single-mode spectrum has exhibited distinctive characters of purely gain-coupled DFB lasers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.103144
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  • 4
    Digitale Medien
    Digitale Medien
    Ultralow chirping short optical pulse (16 ps) generation in gain-coupled distributed feedback semiconductor lasers (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 37-39 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We describe optical short pulse generation in novel gain-coupled distributed feedback (GC-DFB) semiconductor lasers by using a simple electrically pumped gain switching method. An optical pulse as short as 16 ps has been obtained from a 130 ps current pulse. The most exciting result is that the lasers keep single longitudinal mode oscillation with very low wavelength chirping (∼0.12 nm) during the gain switching operation. From the optical pulse width and the amount of the wavelength chirping, we have estimated the α parameter of the GC-DFB laser to be less than 1.6.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.105570
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  • 5
    Digitale Medien
    Digitale Medien
    Epstein-Barr Virus-induced Lymphoblastoid Cell Lines from Patients with Primary Immunodeficiency Diseases (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 11 (1980), S. 0 
    Details
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Peripheral lymphocytes from eight patients with congenital immunodeficiency diseases were infected with Epstein-Barr virus (EBV) in an attempt to establish B lymphoblastoid cell lines (LCL). These patients included three boys with congenital agammaglobulinaemia, two girls with hypogammaglobulinaemia, one boy with common variable immunodeficiency, one boy with severe combined immunodeficiency with adenosine deaminase deficiency, and one boy with DiGeorge syndrome. Five of the patients bore no surface immunoglobulins (slg) on their peripheral lymphocytes. LCL were established from seven of the eight patients. All the LCL established formed rosettes with EAC3 and had the ability to produce cytoplasmic immunoglobulins (clg) of various classes. Culture supernatants concentrated up to 100-fold developed precipitin bands by Ouchterlony's method with antisera to human Ig in all the established LCL. These results suggested that both slg-, clg- and C3+ cells and slg+, clg- and C3+ cells might be the target cells for EBV and that slg-, clg- and C3+ cells might be the precursor cells of B lymphocytes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3083.1980.tb00221.x
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  • 6
    Digitale Medien
    Digitale Medien
    Mammary tumorigenic effect of a new nitrosourea, 1,3-dibutyl-l-nitrosourea (B-BNU), in female Donryu rats (1980)
    Springer
    Journal of cancer research and clinical oncology 96 (1980), S. 35-41 
    Details
    ISSN: 1432-1335
    Schlagwort(e): Mammary tumor ; Nitrosourea ; 1,3-Dibutyl-l-nitrosourea ; Donryu rat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Four groups (groups 1-4) of female Donryu rats were given continuously 400, 200, 100, or 0 ppm solution of 1,3-dibutyl-1-nitrosourea (B-BNU) as their drinking water, and were studied for the development of tumors. The incidence of mammary tumors was 15/19 (79%), 20/24 (83%), 21/26 (81%), and 8/25 (32%) in groups 1, 2, 3, and 4, respectively. In addition, hematopoietic neoplasms, uterine tumors, and vaginal tumors developed in 13, 11, and six rats, respectively in 69 treated rats. Other tumors were infrequent.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00412895
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  • 7
    Digitale Medien
    Digitale Medien
    Impurity Diffusion into GaAs through the SiO〈sub〉2〈/sub〉 Protective Layers (1993)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 117-118 (Jan. 1993), p. 417-422 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/59/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.117-118.417.pdf
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  • 8
    Digitale Medien
    Digitale Medien
    Mosaicism of mitochondria in mitochondrial myopathy: an electronmicroscopic analysis of cytochrome c oxidase (1990)
    Springer
    Acta neuropathologica 80 (1990), S. 642-648 
    Details
    ISSN: 1432-0533
    Schlagwort(e): Mitochondrial myopathy ; Cytochrome c oxidase ; Mosaicism of mitochondria ; Electron microscopic histochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Electron microscopic histochemistry was applied to the study of cytochrome c oxidase activity in each mitochondrion of biopsied muscles from four patients with mitochondrial myopathy [one case of fatal infantile mitochondrial myopathy, one case of myoclonus epilepsy associated with ragged-red fibers (MERRF), and two cases of mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episodes (MELAS)]. In the patient with fatal infantile mitochondrial myopathy, intercellular heterogeneity of mitochondria was recognized. In the three patients with either MERRF or MELAS, cytochrome c oxidase activity was segmentally changed from positive to negative within single muscle fibers. In the two patients with MELAS, small groups of positive-stained mitochondria were located among negative-stained mitochondria in the negative segment of a few muscle fibers. These findings revealed that there were heterogeneous populations of normal and abnormal mitochondria intracellularly or intercellularly within the muscles of these patients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00307633
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  • 9
    Digitale Medien
    Digitale Medien
    Quantitative evaluation of electron transport system proteins in mitochondrial encephalomyopathy (1993)
    Springer
    Acta neuropathologica 85 (1993), S. 370-377 
    Details
    ISSN: 1432-0533
    Schlagwort(e): Mitochondrial myopathy ; Cytochrome c oxidase deficiency ; Immunoelectron microscopy ; In situ hybridization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The levels of mitochondrial electron transport system proteins cytochrome c oxidase (COX) and complex III were measured in muscle fibers of patients with mitochondrial encephalomyopathy using quantitative immunoelectron microscopy. In a patient with Leigh's encephalopathy, immunoreactive COX protein was decreased to 20% of the normal mean value in all muscle fibers examined, while the amount of complex III was within the normal range. In a patient with fatal infantile COX deficiency, the level of COX protein was found to be decreased to 27–40% of the normal value in all muscle fibers examined. In patients with mitochondrial myopathy, encephalopathy, lactic acidosis associated with stroke-like episodes (MELAS) and chronic progressive external ophthalmoplegia (CPEO), COX protein levels were decreased to 20% of normal in muscle fibers lacking COX activity. In normal fibers, however, COX protein levels were also normal. The amount of complex III protein was normal in COX-deficient muscle fibers. In two patients, in situ hybridization was performed for detection of mitochondrial mRNA. Mitochondrial mRNAs were found to be abundant in muscle fibers with decreased COX protein, suggesting a defect at the mitochondrial protein-synthesis level in a COX-deficient muscle fiber.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00334446
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  • 10
    Digitale Medien
    Digitale Medien
    Secondary amyloidosis in glycogen storage disease type Ib (1990)
    Springer
    European journal of pediatrics 149 (1990), S. 344-345 
    Details
    ISSN: 1432-1076
    Schlagwort(e): Glycogen storage disease Ib ; Secondary amyloidosis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract We observed the development of generalized amyloidosis in a girl with glycogen storage disease type Ib (GSD-Ib) who showed neutropenia, neutrophil dysfunction and recurrent infections. Renal and thyroid biopsies showed secondary amyloidosis, characterized by the presence of potassium permanganate sensitive Dylon positive deposits in glomeruli, renal vessels and thyroid interstitium. Immunohistochemistry showed that the deposits were composed of amyloid A (AA) protein. Possibly neutrophil abnormalities are involved in the pathogenesis of amyloidosis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02171563
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