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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of hydrogenated amorphous silicon by capacitance-voltage and surface photovoltage measurements using liquid Schottky barriers (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 1916-1927 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental studies have been made on the electrical properties of hydrogenated amorphous silicon (a-Si:H) using liquid Schottky barriers. We have found that the quasi-static capacitance-voltage (C-V) method can be applied to the a-Si:H/quinone-hydroquinone (Q-HQ) liquid Schottky junction. This method enables us to determine the net density of positive space charge due to ionized traps and impurities in a-Si:H (Ne), the built-in potential (Vb), and the width of the surface space-charge layer (W), of this liquid junction. The barrier height of an undoped a-Si:H/Q-HQ junction has been estimated to be more than 1 eV from the value of Vb thus obtained. By C-V and surface photovoltage (SPV) measurements on the same samples, we have studied the changes in the properties of a-Si:H with doping and with prolonged illumination. It has been found that phosphorous (P) doping drastically decreases the hole diffusion length measured by the SPV method and increases the value of Ne. Slight boron (B) doping increases the ambipolar diffusion length L1 and the field assisted carrier collection length L2, both of which have been determined by SPV. These results explain the observed enhancement of the photovoltaic properties of a-Si:H p-i-n solar cells with the slight B doping to the i layers. The values of L1 and L2 have a distinct correlation with the photo-voltaic properties in the slightly B-doped samples, which has confirmed the effectiveness of the SPV method in characterizing a-Si:H as a photovoltaic material. We have found that the increase in Ne and the decrease in L1 occur simultaneously in undoped a-Si:H with prolonged illumination. On the other hand, the increase in Ne does not always accompany the decrease in L1 in the photoinduced changes in P-doped or slightly B-doped a-Si:H, which suggests the difference in the mechanism of the changes between undoped and doped samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338038
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  • 2
    Electronic Resource
    Electronic Resource
    Testicular Dynamics in Syrian Hamsters Exposed to Both Short Photoperiod and Low Ambient Temperature (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Anatomia, histologia, embryologia 34 (2005), S. 0 
    Details
    ISSN: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The object of this study was to determine the details of morphological dynamics of spermatogenesis in Syrian hamsters exposed to both short photoperiod and low ambient temperature. Eight-week-old male hamsters, kept in a long photoperiod (14 h L, 10 h D), were transferred to a short photoperiod (6 h L, 18 h D) and kept there for 13 weeks to induce testicular regression. Some hamsters were then transferred from the room at 23°C to that at 5°C (5°C group). Remaining hamsters were continuously kept at 23°C (23°C group). Thereafter, the morphology was examined. As a result, it took only 8 weeks until spermatogenesis recovered in the 23°C group. However, it was not until 20 weeks that spermatogenesis was recognized in the 5°C group. As the regulation of seasonal testicular activity is characterized by coordinated shifts in the relationships among mitosis, meiosis, and apoptosis, the changes in the proliferative and apoptotic activities were examined. Although no significant difference in proliferative activity of spermatogonia between the 5°C and the 23°C groups was confirmed, a notable increase in the rate of apoptosis was observed in the 5°C group. Furthermore, this increase was more salient during the hibernation period. These findings suggest that both cold ambient temperature and hibernation caused the delay of testicular recrudescence and this delay arose from the increase of apoptotic activity but not the change in proliferative activity in spermatogonia in the 5°C group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0264.2005.00599.x
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  • 3
    Electronic Resource
    Electronic Resource
    An Ultrastructural Study on the Leydig and Sertoli Cells in the Immature Lesser Mouse Deer (Tragulus javanicus) (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Anatomia, histologia, embryologia 34 (2005), S. 0 
    Details
    ISSN: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Leydig and Sertoli cells of the immature lesser mouse deer testes, obtained in East Malaysia, were observed using light and transmission electron microscopy (TEM). The testes were fixed in 5% glutaraldehyde, post-fixed in 1% OsO4, dehydrated in ethanol, and embedded in Araldite M. Serial semi-thin sections were cut, stained with toluidine blue and observed using light microscopy. Serial ultra-thin sections were cut, stained with uranyl acetate and lead citrate, and examined using TEM. As a result, ultrastructurally, two types of underdeveloped filament bundles were infrequently recognized in Leydig cells, but not in other testicular cells. One type was the underdeveloped bundles of actin filaments (approximately 5 nm in diameter), which were found in the nucleus of Leydig cells. The other type was the underdeveloped bundles of intermediate filaments (approximately 10 nm in diameter), which were found in the cytoplasm of Leydig cells. A multivesicular nuclear body (MNB) – specifically present in the Sertoli cell nucleus of ruminant testes – was infrequently observed. The MNB is situated in the vicinity of nuclear membrane, still in an underdeveloped stage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0264.2005.00589.x
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  • 4
    Electronic Resource
    Electronic Resource
    Myofibroblasts in malignant fibrous histiocytoma-histochemical, immunohistochemical, ultrastructural and tissue culture studies (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental dermatology 13 (1988), S. 0 
    Details
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Spindle cells found in malignant fibrous histiocytoma (MFH) were examined using histochemical, immunohistochemical, ultrastructural and tissue culture studies. They were deeply eosinophilic on haematoxylin-eosin staining, strongly PAS-positive and darkly stained with nicotinamide adenine dinucleotide tetrazolium reductase and menadione linked 2-glycerophosphate dehydroge-nase. They also labelled with anti-S-100 and actin antibodies. Fuchsin positive intra-cytoplasmic filaments were recognizable with phosphotungstic acid haematox-ylin stains. Ultrastructurally, the spindle cells had an indented nucleus and elongated cytoplasm containing myofilaments with electron dense bodies. In tissue culture, the spindle cells had plump cytoplasm and were closely apposed to each other within a sheath of fibro-blasts. Using electron microscopy the cultured spindle cells were found to contain numerous glycogen particles, rod-shaped mitochondria, rough endoplasmic reticulum and bundles of myofilaments within the cytoplasm. The spindle cells were identified as ‘myofibroblasts’ and the presence of myofibroblasts in MFH was thus confirmed. The function of myofibroblasts in malignant fibrous histiocytoma is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2230.1988.tb00738.x
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  • 5
    Electronic Resource
    Electronic Resource
    Light and scanning electron microscopic studies on wrinkles in aged persons' skin (1986)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 114 (1986), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Wrinkles in six aged persons (67–82 years of age) have been investigated by light microscopy (LM) and scanning electron microscopy (SEM). There are two types of wrinkles. One is a deep wrinkle which develops on the sun-exposed skin and does not disappear on stretching (permanent wrinkle). The LM and SEM showed less elastotic change in the upper dermis in the area of wrinkle than in that of the surroundings. The other type is a shallow wrinkle which develops on sun-protected skin and disappears on stretching (temporary wrinkle). The LM and SEM showed the decrease or loss of the elastic fibres in the papillary dermis as seen in ageing skin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1986.tb02824.x
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  • 6
    Electronic Resource
    Electronic Resource
    Epicatechin can cause the seedling growth inhibitor, nagilactone E, to induce growth stimulation (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1462-1463 
    Details
    ISSN: 1420-9071
    Keywords: Flavonoids ; growth inhibition ; seedling growth ; lettuce seedling ; rice seedling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A possible new role for the flavonoid (−)-epicatechin (II) is described. It has no growth effects on its own, but when it is added to lettuce and rice seeds together with the known seedling growth inhibitor nagilactone E (I), the growth inhibitor activity ofI can cease and growth stimulation can be observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01950037
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  • 7
    Electronic Resource
    Electronic Resource
    Serological and genetical relationships of three herpesvirus strains from salmonid fish (1989)
    Springer
    Archives of virology 104 (1989), S. 163-168 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Serological and genetical relationships of three salmonid herpesviruses [strain H-83, OO-7812 strain ofOncorhynchus masou virus (OMV) andHerpesvirus salmonis] were investigated. Although the serological relationships of theses viruses were not distinctly demonstrated by cross-neutralization test, cross enzyme-linked immunosorbent assay revealed that strain H-83 and OMV appeared to be serologically more closely related to each other than toH. salmonis. Strain H-83 was genetically similar to OMV but distinct fromH. salmonis by restriction endonuclease cleavage analysis and DNA-DNA hybridization test. These results indicated that strain H-83 should be classified under the same group as OMV, andH. salmonis belong to another group of salmonid herpesviruses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313818
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  • 8
    Electronic Resource
    Electronic Resource
    Spinocerebellar degeneration with prominent involvement of the motor neuron system: Autopsy report of a sporadic case (1986)
    Springer
    Acta neuropathologica 70 (1986), S. 82-85 
    Details
    ISSN: 1432-0533
    Keywords: Spinocerebellar degeneration ; Amyotrophic lateral sclerosis ; Sporadic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A sporadic case of spinocerebellar degeneration with prominent involvement of the motor neuron system is reported. A Japanese male without contributing family history, developed cerebellar ataxia at the age of 52, followed by generalized amyotrophy and ophthalmoplegia, and died aged 58. The clinical findings were pathologically verified as degeneration of the spino-ponto-cerebellar system and the motor neuron system, the latter almost identical to those of amyotrophic lateral sclerosis. Additional subclinical changes were found in the dentate nucleus and substantia nigra. Brain-stem nuclei subserving eye movements were well preserved, suggesting a supranuclear basis for the ophthalmoplegia. This unusual combination of system degenerations has on rare occasions been reported in the heredofamilial cerebellar disorders. As a sporadic case, however, this may be the first autopsy case of spinocerebellar degeneration with severe concurrent involvement of the motor neuron system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00689519
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  • 9
    Electronic Resource
    Electronic Resource
    Establishment of a monoclonal antibody against senile plaques and its application for immunohistological and immunoelectron microscopical studies in the brain of the elderly (1989)
    Springer
    Acta neuropathologica 79 (1989), S. 44-47 
    Details
    ISSN: 1432-0533
    Keywords: Monoclonal antibody ; Senile plaque ; Alzheimer's disease ; Senile dementia of Alzheimer type ; Congophilic angiopathy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A monoclonal antibody (Am-3) was produced against senile plaques in the brain of a patient with Alzheimer's disease. Am-3 was reactive with senile plaques of typical, primitive and diffuse type not only in the brain used as immunogen, but also those in the brain of 15 out of 25 autopsy cases of the aged people. Moreover, Am-3 was also reactive with granular materials of various sizes scattered in the 1st, 3rd and 4th layers of the cerebral cortices of the cases with severe dementia. Am-3 was also reactive with vessel wall of the congophilic angiopathy. By immunoelectron microscopic examination, Am-3 was positive with amyloid fibril in the core and crown of senile plaques, and in the congophilic angiopathy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308956
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  • 10
    Electronic Resource
    Electronic Resource
    Theoretical analysis on the limitations of the open-circuit voltage of a hydrogenated amorphous silicon p-i-n solar cell (1986)
    Springer
    Applied physics 39 (1986), S. 277-286 
    Details
    ISSN: 1432-0630
    Keywords: 86.30 ; 72.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We have made theoretical studies on the limitation of the open-circuit voltageV oc of a hydrogenated amorphous silicon (a-Si:H) p-i-n type solar cell. The effects of the tail states in the a-Si:H i layer and of the interface recombination are discussed in detail. The opencircuit voltage increases when the distribution of the tail states is sharp and/or the capture cross sections of these states are small. This is because the recombination rate of photogenerated carriers and/or the density of space charge due to trapped carriers in these states become low in these conditions. These effects of the tail states on the value ofV oc become pronounced when the built-in potential of the p-i-n junction is high. The decrease in the effective recombination velocity of carriers at the p/i and n/i interfaces results in an increase ofV oc. This increase becomes remarkable when the effects of the tail states on the value ofV oc are small. Both the sharp distribution of tail states and the small value of the interface recombination velocity are necessary to increase considerably the value ofV oc. We show the conditions of the material parameters necessary to obtain an open-circuit voltage of 1.0 V.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617273
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