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  • Electronic Resource  (42)
  • 2000-2004  (10)
  • 1990-1994  (26)
  • 1980-1984  (3)
  • 1965-1969  (2)
  • 1920-1924  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Piezoelectric detection of the photoacoustic signals of n-type GaAs single crystals (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 2408-2413 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Piezoelectric photoacoustic (PA) measurements on liquid-encapsulated-Czochralski-grown n-GaAs were carried out at room temperature. A continuous broad band below 1.35 eV and a peak at 1.383 eV were observed in the PA amplitude spectra. By comparing with the optical-absorption spectra, it is concluded that the broad band is due to the electron transition involving the EL2 deep-lying defect levels. For the observed peak at 1.383 eV, the origin is considered to be dislocation related. The possibility that this peak is an apparent one expected from the proposed models for the PA signal generation is denied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351098
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  • 2
    Electronic Resource
    Electronic Resource
    A thermally stimulated process in magnetic complex permeabilities of light illuminated yttrium iron garnet with some degrees of oxygen vacancy : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6034-6036 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: On warming the previously white light illuminated yttrium iron garnet with some deficiency of oxygen with a white light, an imaginary part of permeability μ‘ below 10 kHz has been found to show the triple peaks as a function of temperature, the activation energies of which are 0.095–0.22, 0.50, and 0.81 eV, respectively. Furthermore, the height of each peak depends strongly on the illuminating time of exciting light. These features have been discussed and interpreted based on a modified "two-center'' model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347781
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  • 3
    Electronic Resource
    Electronic Resource
    Photoinduced disaccommodation of magnetic permeability in yttrium iron garnet (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6321-6321 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: After illuminating a single crystal of yttrium iron garnet grown by a modified floating zone method at 77 K, the complex permeability was measured from 77 to 300 K under low alternating field. As well as the decreasing of permeability and the appearance of a peak in μ‘-T curve, disaccommodation (DA) or the change of permeability with time was found to be induced around 140 and 210 K. As the result of the superposition of disaccommodation, the peak in the μ‘-T curve is observed to be divided. These photoinduced magnetic effects cannot be attributed to a single origin, for only photoinduced DA disappears in the process of warming. The origins are discussed and a model is proposed, taking account of the mobility of oxygen vacancy depending on the charge state and the photoexcited electron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355387
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  • 4
    Electronic Resource
    Electronic Resource
    In situ scanning tunneling microscopic study of polymerization of C60 clusters induced by electron injection from the probe tips (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 2834-2836 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polymerization of C60 clusters epitaxially grown on Si(111)-(7×7) substrates was found to be induced by electron injection from the probe tips of scanning tunneling microscopes (STM) as the sample bias was increased from +4.0 to +5.5 V, exhibiting an evolution behavior characterized by an incubation, a linear growth, and a saturation. The incubation time and the growth rate are dependent greatly on the sample site, which is explained by a model taking into account the pre-existing stress as the driving force of the polymerization and the internal stress built up as a consequence of polymerization producing a stress for backward reactions. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1320865
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  • 5
    Electronic Resource
    Electronic Resource
    Phosphorescence from the delocalized triplet state of polysilylenes (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 12144-12146 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100149a007
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  • 6
    Electronic Resource
    Electronic Resource
    Intracerebroventricular Administration of Melanin-Concentrating Hormone Suppresses Pulsatile Luteinizing Hormone Release in the Female Rat (2000)
    Oxford, UK : Blackwell Science Ltd
    Journal of neuroendocrinology 12 (2000), S. 0 
    Details
    ISSN: 1365-2826
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Melanin-concentrating hormone (MCH) has been reported to be involved in the regulation of feeding behaviour in rats and mice. Because many neuropeptides that influence ingestive behaviour also regulate reproductive function, the present study was designed to determine if central administration of MCH changes pulsatile secretion of luteinizing hormone (LH) in the rats. Wistar-Imamichi strain female rats were ovariectomized and implanted with oestradiol to produce a moderate inhibitory feedback effect on LH release. The effects of i.c.v. injections of MCH on LH release were examined in freely moving animals. Blood samples were collected every 6 min for 3 h through an indwelling cannula. After 1 h of sampling, MCH (0.1, 1 or 10 μg/animal) or vehicle (saline) was injected into the third cerebroventricle. Because MCH is also reported to affect the hypothalamo-pituitary-adrenal (HPA) axis, which in turn, can influence reproductive function, plasma corticosterone concentrations were determined in the same animals at 30-min intervals during the first and last hours and every 12 min during the second hour of the 3-h sampling period. When expressed as per cent changes, mean plasma LH concentrations after MCH administration were significantly lower in the animals injected with all doses of the peptide compared with vehicle-treated animals; LH pulse frequency was significantly lowered by 1 μg of MCH. Per cent changes in mean plasma corticosterone levels were not significantly affected by MCH administration. These results in oestradiol-treated ovariectomized rats indicate that central MCH is capable of inhibiting pulsatile LH secretion. We have previously shown that 48-h fasting suppresses pulsatile LH release in the presence of oestrogen. Take together, these results raise the possibility that MCH could play a role in mediating the suppression of LH secretion during periods of reduced nutrition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2826.2000.00482.x
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  • 7
    Electronic Resource
    Electronic Resource
    Gingipains in the culture supernatant of Porphyromonas gingivalis cleave CD4 and CD8 on human T cells (2002)
    Oxford, UK : Munksgaard International Publishers
    Journal of periodontal research 37 (2002), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Porphyromonas gingivalis has been shown to attack host defense systems through proteolytic cleavage of a wide variety of members of the systems. In this study, we examined the ability of P. gingivalis culture supernatant to alter the expression of human T cell surface proteins. As judged by flow cytometric analysis, detection of CD4 expression was completely eliminated by the supernatant, but CD8 was less sensitive. When the culture supernatant was added with reducing agents, proteolytic activity was enhanced, resulting in the cleavage of CD8. Mitogenic response of T cells to phytohemagglutinin or concanavalin A was decreased by the treatment of the cells with the culture supernatant of P. gingivalis. The three forms of gingipains (high molecular mass arginine-specific gingipain, arginine-specific gingipain 2 and lysine-specific gingipain) purified from the culture supernatant of P. gingivalis actively cleaved CD4 and CD8 on human T cells, indicating that proteolytic activity of the culture supernatant was due to gingipains. These results suggest that cysteine proteinases like gingipains released from P. gingivalis cleave T cell surface proteins and impede T cell function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0765.2002.01364.x
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  • 8
    Electronic Resource
    Electronic Resource
    Expression of membrane alkaline phosphatase activity on gingival fibroblasts in chronic inflammatory periodontal disease (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 29 (1994), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We investigated the expression of membrane alkaline phosphatase (ALP) activity on fibroblasts in inflamed gingiva from 7 patients with adult periodontitis. ALP activity was ultrahistochemically detected by a cerium-based capture method. The degree of ALP activity was estimated by morphometric analysis of the percentage of the perimeter on which ALP reaction product was deposited. Fibroblasts in the non-inflammatory connective tissue were surrounded by bundles of collagen fibrils, and the majority of these fibroblasts showed ALP-negative or weakly ALP-positive reaction. By contrast, fibroblasts in the inflammatory connective tissue were either surrounded by a non-collagenous substance or in contact with inflammatory cells, and the majority of these fibroblasts showed a strong ALP-positive reaction. These results suggest that the expression of membrane ALP activity on gingival fibroblasts is induced by microenvironmental changes associated with the loss of contact between the cells and the extracellular collagenous matrix during inflammatory reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1994.tb01220.x
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  • 9
    Electronic Resource
    Electronic Resource
    Molecular characterization of a 10-kDa buckwheat molecule reactive to allergic patients’ IgE (2004)
    Oxford, UK : Munksgaard International Publishers
    Allergy 59 (2004), S. 0 
    Details
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background:  Using the sera from buckwheat (BW)-allergic patients, several putative causative molecules were reported. However, few molecules were determined on the molecular structure. We demonstrated in 2000 that the major allergen with 24 kDa (BW24KD) is a legumin-like storage protein.Objective:  The aim of this study was to isolate and characterize further a major allergen with 10 kDa by molecular cloning.Methods and results:  Buckwheat allergens were identified by immunoblotting analysis using sera from 14 allergic and two nonallergic individuals. We identified a protein with 10 kDa (BW10KD) that reacted with immunoglobulin E (IgE) more strongly than with IgG and IgA in 57% of the allergic patients but not with IgE in nonallergic individuals. Analyses were performed by N-terminal amino acid sequencing and molecular cloning. Physiological significance was assessed by an immunoblotting experiment showing that the reactivity of an allergic patient's serum IgE to BW10KD was competitively inhibited by natural BW extracts.Conclusion:  Molecular cloning experiments indicated that BW10KD as a BW allergen was a member of the 2S-albumin multigene family.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1398-9995.2003.00412.x
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  • 10
    Electronic Resource
    Electronic Resource
    IgA1 produced by tonsillar lymphocytes is under-O-glycosylated in IgA nephropathy (2002)
    Melbourne, Australia : Blackwell Science Pty
    Nephrology 7 (2002), S. 0 
    Details
    ISSN: 1440-1797
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-1797.7.s.24.x
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