ZIB

1

Digitale Medien

Nb interaction with hydrogen plasma (2001)

Nakamura, Y. ; Busnyuk, A. ; Suzuki, H. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 89 (2001), S. 760-766

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A niobium membrane was immersed in hydrogen plasma and could be electrically biased to vary the energy of bombarding ions in the range of 1–200 eV. The fluxes of plasma driven absorption and permeation were almost entirely governed by incident suprathermal neutrals (mostly, thermal atoms), whose energy does not depend on membrane bias, but the ions of controllable energy do affect the neutral-induced permeation through modifying the membrane surface. At the zero bias a high temperature-independent plasma driven permeation (superpermeation) was observed alongside of an enhanced absorption. Bombardment by ions of an energy higher than 50 eV resulted in a sharp decrease of the plasma driven permeation/retention and in an acceleration of boundary processes of absorption/reemission of thermal molecules. At ion energies below 50 eV, the effect of ion bombardment on the plasma driven permeation and the kinetic coefficients of boundary processes were nonmonotonic in ion energy, having a maximum at ∼10 eV. Both an in situ doping with O of the bulk of Nb and a membrane temperature increase reduced the effects of ion bombardment to their complete disappearance. Responsible for that was the replenishment by means of surface segregation of an oxygen monolayer sputtered by ion bombardment. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1331075

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2

Digitale Medien

Scattering and extinction of ion beams in a dusty plasma device (2001)

Nakamura, Y.

[S.l.] : American Institute of Physics (AIP)

Physics of Plasmas 8 (2001), S. 5086-5090

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ISSN: 1089-7674

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Collisions of ions with charged dust grains are important for the propagation of low frequency waves such as dust acoustic waves and dust ion-acoustic waves. The collision cross-sectional area of charged dust grains depends on the velocity of an ion beam. The collision cross-sectional area of charged dust grains with beam ions is measured. It is compared with the geometrical cross-sectional area of the grain. The experiment is performed in a dusty double-plasma device with glass beads of 8.9 μm in average diameter. The ion beam current and energy are measured with a directional retarding potential analyzer. It is observed that, when dust density inside the system is increased, the beam current ratio is reduced. From the reduction of the ion beam current, the effective cross-sectional area of the dust particle is estimated as a function of the beam energy. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1419253

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3

Digitale Medien

Observation of ion-acoustic solitary waves in a dusty plasma (2001)

Nakamura, Y. ; Sarma, A.

[S.l.] : American Institute of Physics (AIP)

Physics of Plasmas 8 (2001), S. 3921-3926

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ISSN: 1089-7674

Quelle: AIP Digital Archive

Thema: Physik

Notizen: An experiment on ion-acoustic solitary waves in dusty plasma is performed in a dusty double-plasma device. The leading part of a sinusoidal pulse develops to an oscillation. The troughs of the oscillation become shallow when dust particles are mixed into the plasma. The Mach velocity of the first peak in the oscillation decreases due to the presence of negatively charged dust grains for a fixed height of the peak. The width of the peak normalized with Debye length increases when the dust particles are introduced into the plasma. The experimental results are compared with the numerical integrations of a modified Korteweg–de Vries–Burgers equation which contains the terms of kinematic viscosity and of collisions of ions with the dust particles. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1387472

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4

Digitale Medien

Attitudes to oral care among caregivers in Japanese nursing homes (2001)

Sumi, Y ; Nakamura, Y ; Nagaosa, S ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Gerodontology 18 (2001), S. 0

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ISSN: 1741-2358

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Medizin

Notizen: Objectives: The purpose of this study is to investigate oral care practice and awareness of it among caregivers in Japanese nursing homes.Methods: Caregivers were surveyed by means of a self-administered questionnaire designed to elicit the following information: awareness of oral care, its importance, the burden involved in oral care, and systemization of oral care.Results: The results showed that most caregivers are adequately informed of the importance of oral care, but are inadequately educated in oral care and have little training in systematic oral care.Conclusion: The importance of providing appropriate and systematic oral care training must be stressed among caregivers along with the need to develop equipment to simplify and support oral care.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1741-2358.2001.00002.x

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5

Digitale Medien

Survival of memory T cells specific for Japanese cypress pollen allergen is maintained by cross-stimulation of putative pectate lyases from other plants (2001)

Nakamura, Y. ; Takagi, S. ; Suzuki, M. ; [weitere]

Copenhagen : Munksgaard International Publishers

Allergy 56 (2001), S. 0

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ISSN: 1398-9995

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Medizin

Notizen: In view of recent studies on the mechanisms of the survival of peripheral memory T cells, we tested the biologic role of pectate lyase, a pectin-degrading enzyme, as the cross-reactive antigen required for the recurring survival signals for human T cells specific for Cha o 1, a pollen allergen molecule of the Japanese cypress. We determined a 16-mer epitope peptide for the T-cell clone, and prepared synthetic oligopeptides of homologous regions in putative pectate lyase of other plants. Of these homologous peptides, ZePel (Zinnia elegans), ban 17 (banana), and Amb a 1.1 (short ragweed) induced strong proliferative responses of the Cha o 1-specific T-cell clone in vitro. In addition, suboptimal doses of peptide homologs derived from banana and short ragweed enhanced the survival potency of this T-cell clone without detectable proliferative responses to the peptides. When there was no antigen stimulation, the T-cell clone decreased in viable cell number and lost antigen-specific proliferation activity on day 6 during in vitro incubation. On the other hand, T-cell clones incubated with these survival-inducing peptides maintained proliferative activity to Cha o 1 even on day 9. Serum derived from the donor patient did not contain detectable levels of IgE specific to banana or short ragweed by CAP-RAST. These results show that human T cells specific for pollen allergen seem to use cross-reactive pectate lyase peptides to deliver survival signals even in the absence of pollen allergen, and memory T cells maintained in such a manner might be functioning at the onset of allergic pollinosis, although pollen allergens are seasonal.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1034/j.1398-9995.2001.056005385.x

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