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  • 1990-1994  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Schottky barrier height enhancement of n-In0.53Ga0.47As by a novel chemical passivation technique (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 6571-6573 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A novel method of enhancing Schottky barrier height, while reducing the surface-state density on n-type In0.53Ga0.47 As surfaces using P2S5/(NH4)2S and (NH4)2Sx passivation is described in this communication. The current-voltage and capacitance-voltage characteristics show that passivated diodes have lower reverse leakage current and higher effective barrier height than that of the unpassivated diodes. The electrical characteristics of passivated diodes have not changed after one month of exposure to the air.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345138
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Passivation of deep level states caused by misfit dislocations in InGaAs on patterned GaAs (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1417-1419 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Deep level transient spectroscopy (DLTS) and cathodoluminescence (CL) were used to study the hydrogen passivation of misfit dislocations in In0.06Ga0.94As/GaAs heterostructures. The CL observations indicate that hydrogen plasma exposure passivates most, but not all, of the dark line defects existing in the specimen prior to hydrogenation. The concentration of deep level defect states that cannot be passivated is below the detection limit of the DLTS instrument (approximately 4×1012 cm−3). We find the passivation is stable after anneals at temperatures as high as 600 °C, indicating that hydrogen passivation of misfit dislocations is at least as stable as that of the isolated point defect studied previously with DLTS [W. C. Dautremont-Smith, J. C. Nabity, V. Swaminathan, M. Stavola, J. Chevalier, C. W. Tu, and S. J. Pearton, Appl. Phys. Lett. 49 1098 (1986)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108697
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Patterns of cyclic AMP binding in normal human breast (1994)
    Springer
    Breast cancer research and treatment 30 (1994), S. 153-158 
    Details
    ISSN: 1573-7217
    Keywords: breast ; cyclic AMP ; proliferation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cyclic AMP binding proteins have been measured in normal breast tissue, in a variety of physiological conditions including resting state (69 cases), pregnancy (15 cases), lactation (4 cases), post-lactational involution (6 cases), and prolonged involution (10 cases). Levels varied greatly within the groups but median values were elevated in pregnancy, lactation, and post-lactational involution as compared with the resting and prolonged involutionary states. The proportion of different types of cyclic AMP binding proteins also differed between groups. Resting breast showed approximately equal amounts of type I and II whereas pregnant and post-lactational involuting breast tissue had an increased proportion of type I binding, and the prolonged involutionary state tended to be associated with low type I. Within the subgroup of nulliparous resting breasts, the proportion of type I cyclic AMP binding protein was significantly elevated during the second half of the menstrual cycle compared with the first (p 〈 0.05). There were also significant positive associations between the level of epithelial proliferation and both total (p 〈 0.015) and type I (p 〈 0.002) cyclic AMP binding. This represents the strongest of associations thus far reported between signalling systems and proliferation in the normal breast.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00666059
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Helminths of rodents and marsupials from Papua New Guinea, with the description of two new species, Echinostoma echymiperae n. sp. (Digenea: Echinostomatidae) and Vampirolepis peroryctis n. sp. (Cestoda: Hymenolepididae) (1990)
    Springer
    Systematic parasitology 15 (1990), S. 223-237 
    Details
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The following rodents and marsupials from the Western Highlands of Papua New Guinea have been examined for helminths: Anisomys imitator, Melomys spp., Pogonomelomys ruemmleri, Rattus spp., Echymipera kalubu and Peroryctes raffrayanus. Two new species and a number of new host records are reported. Echinostoma echymiperae n. sp., a digenean from the intestine of Echymipera kalubu, is characterised by the number of collar spines, the body armature and the shape and position of the gonads. Vampirolepis peroryctis n. sp., a cestode from the intestine of Peroryctes raffrayanus, is characterised by the length of the rostellar hooks, the shape of the ovary, the arrangement of the testes in a triangle and the extent of the cirrus-sac. Hymenolepis aklei, H. bradleyi, H. antechini, H. bettongiae, H. cercarteti, H. isoodontis and H. potoroi are transferred to Vampirolepis as new combinations. E. kalubu is a new host for Linstowia semoni and Pogonomelomys ruemmleri is a new host for Hymenolepis diminuta. V. peroryctis is the first platyhelminth to be reported from Peroryctes raffrayanus and Raillietina (Raillietina) sp. the second to be reported from the genus Melomys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010139
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    Paper (German National Licenses)
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