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  • Articles: DFG German National Licenses  (8)
  • 1990-1994  (5)
  • 1980-1984  (3)
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  • Articles: DFG German National Licenses  (8)
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Year
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  • 1
    Electronic Resource
    Electronic Resource
    Minority electron transport property in p-GaAs under high electric field (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 293-299 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-of-flight and photoluminescence measurements are performed for p-GaAs samples at room temperature to investigate minority electron transport properties under high electric field. Reduction of drift velocity, absence of negative differential resistance, and thermally nonequilibrium states between electrons and holes were observed. These features were different from those for majority electrons and indicate strong dependence on hole concentration. Through studies of the energy loss rate and energy and momentum relaxation times, and by performing Monte Carlo calculations including electron-hole interaction, it is clarified that the energy and momentum transfers by electron-hole interaction have significant effects on minority electron transport property.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345251
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Velocity electric field relationship for minority electrons in highly doped p-GaAs (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 824-826 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using the time-of-flight method, the drift velocity for minority electrons in highly doped p-GaAs was successfully measured at room temperature. The obtained velocity electric field relationships indicate that the velocity does not decrease but slightly increases and then saturates with increasing hole concentration above 1×1019 cm−3. Such behavior is well explained by the effects of degeneracy, which reduces the electron-hole interaction, and the hole distribution function dependence on electric field from the Monte Carlo calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102674
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Histological studies on the host response to Myxobolus artus Akhmerov, 1960 (Myxozoa: Myxobolidae) infection in the skeletal muscle of carp, Cyprinus carpio L. (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 41 (1992), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Myxobolus artus infection of carp is reported for the first time from Japan. In most cases, it took the form of interfibrillar pseudocysts in the skeletal muscle, some showing abnormal growth, imperfect encapsulation of the parasite by the host connective tissue and irregular development of the ectoplasm. Such atypical pseudocysts probably ruptured before the completion of sporogenesis, causing lysis of adjacent muscle fibres. Intrafibrillar pseudocysts were also present. After spore formation was complete or atypical pseudocytes were ruptured host reaction was initiated. Spores were phagocytosed and transported to the melanomacrophage centres in the kidney, liver, spleen etc. Phagocytosed spores were also observed in the capillaries and epithelial tissues of various organs, suggesting that the spores were transported there from the skeletal muscle through the host vascular system. They are thought to be discharged from the host through the skin and intestine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1992.tb02665.x
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  • 4
    Electronic Resource
    Electronic Resource
    Humoral immune response of carp Cyprinus carpio to Myxobolus artus (Myxozoa: Myxobolidae) infection (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 43 (1993), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The circulating antibody which reacted with sonicated spores of Myxobolus artus was detected in some naturally infected carp. However, some other fish had no detectable sign of infection, though they had the antibody. When carp were injected either with intact or sonicated spores, the antibody was not produced, while fish injected either with developing stages (presporogonic and sporoblast stages) of the parasite or sonicated spores with bovine serum albumin elicited the antibody production. The results of the injection experiments suggest that (1) developing stages have antigenicity to carp, and (2) spores have lost the antigenicity; sonicated spores are haptens, with which the antibody can react. In an indirect fluorescent antibody technique, sera positive for the antigen reacted with developing stages of the parasite, but not with the spore.The mechanism of the host immune response against M. artus is discussed in relation to a previous observation that the parasite sometimes underwent abnormal development, in which host encapsulation was imperfect or even lacking, probably leading to degeneration of pseudocysts before the completion of spore formation. It is plausible that the antibody was produced when pseudocysts which showed abnormal growth ruptured during their developing stages, resulting in exposure of the young parasite to the host immune system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1993.tb00579.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    On the pathogenesis of intestinal aganglionosis. A consideration based on electron microscopic observations of experimental and clinical aganglionoses (1980)
    Springer
    Cellular and molecular life sciences 36 (1980), S. 1073-1074 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A close resemblance in fine structure was observed between the aganglionic colon, produced in rats by serosal application of 0.1% benzalkonium chloride solution, and the aganglionic descending colon, or more proximal segments, of Hirschsprung's disease. The pathogenesis of the disease is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01965977
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Immunohistochemical localization of S-100 protein in human cerebral and cerebellar cortices (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 335-337 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary S-100 protein, a highly acidic protein specific to the nervous system, is immunohistochemically localized exclusively in glial cells, but not in any type of neuron in human cerebral and cerebellar cortices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01955336
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    S-100 protein in human glial tumours (1982)
    Springer
    Acta neurochirurgica 65 (1982), S. 239-251 
    Details
    ISSN: 0942-0940
    Keywords: Human glial tumour ; S-100 protein ; differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The authors studied a total of 48 human glial tumours for S-100 protein, an extremely acidic protein specific to the nervous system, by immunohistochemistry and by micro-complement fixation assay in order to evaluate S-100 protein as an index for malignancy of glial tumours. All of 48 glial tumours analyzed in the present study demonstrated variable amounts of S-100 protein which might serve as a biochemical cell marker for glial tumours. The mean value of S-100 protein content in 3 ependymomas is higher than those of 19 low-grade (grades I, II) astrocytomas and 26 high-grade (grades III, IV) astrocytomas, being lowest in the latter. A statistically significant (p〈0.001) difference in S-100 protein levels between low-and high-grade astrocytomas is observed, but not for ependymoma. At present, however, no correlation can be found between S-100 protein content of a tumour and the patient's survival time. Immunoperoxidase staining for S-100 protein in high-grade astrocytomas is generally weak in intensity and heterogeneous throughout the section, whereas that in low-grade astrocytomas and ependymomas is relatively strong and homogeneous, indicating that high-grade astrocytomas consist of a more heterogeneous population of tumour cells in terms of S-100 protein. These results show that the investigation of S-100 protein in a glial tumour is valuable to a certain extent in assessing the degree of differentiation or malignancy of the tumour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01405850
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Severe pulmonary pneumocystosis in simian acquired immunodeficiency syndrome induced by simian immunodeficiency virus: its characterization by the polymerase-chain-reaction method and failure of experimental transmission to immunodeficient animals (1993)
    Springer
    Parasitology research 79 (1993), S. 624-628 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Pneumocystis carinii (Pc) infection was observed in three of five rhesus monkeys infected with simian immunodeficiency virus (SIVmac251). They showed severe symptoms similar to those associated with human acquired immunodeficiency syndrome (AIDS). Histopathology revealed severe pulmonary pneumocystosis in one of three Pc-positive monkeys, and anti-Pc antibodies were detected in sera from two of the three monkeys. Localization of Pc organisms in various organs of the monkeys was examined by the polymerase-chain-reaction (PCR) method, and Pc-specific bands of DNA amplification were detected in the liver, kidney, spleen, adrenal gland, testis, brain, and other organs examined, but no Pc organism was found in these organs by histopathologic examination. These results suggest that the activation of a latent infection of Pc occurs in SIV-infected rhesus monkeys as well as in human AIDS. Experimental transmission of Pc derived from a simian was attempted in severe combined immunodeficiency (SCID) mice and athymic nude (rnu/rnu, F344) rats. These animals were inoculated intranasally with 104 Pc cysts, but neither histopathologic changes nor Pc organisms were detected in SCID mice at 4 months after inoculation or in nude rats at 2 months postinoculation, suggesting that simian Pc is species-specific.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00932502
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    Paper (German National Licenses)
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