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  • Electronic Resource  (17)
  • 2000-2004  (4)
  • 1990-1994  (12)
  • 1975-1979  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Photodissociation study on Mg+(H2O)n, n=1–5: Electronic structure and photoinduced intracluster reaction (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 1161-1170 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photodissociation spectra of Mg+(H2O)n (n=1–5) cluster ions were examined in the wavelength region from 720 to 250 nm by monitoring the total yield of the fragment ions. The absorption bands exhibit redshifts as large as 17 000 cm−1 with respect to the 2P–2S resonance line of the free Mg+ ion and were explained by the shift of this transition as a result of hydration. The spectra also exhibit clear evolution of solvation shell with the first shell closing at n=3, being consistent with the theoretical prediction. The mass spectra of the fragment ions show the existence of two dissociation processes: the evaporation of water molecules and the photoinduced intracluster reaction to produce the hydrated MgOH+ ion, MgOH+(H2O)m. The branching fraction between the two processes depends strongly on the solvent number n and also on the photolysis wavelength. The energetics and the dynamics of the dissociation processes were discussed in conjunction with the results of ab initio calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466646
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic and magneto-optical properties of (Tb,Dy)Nd/FeCo multilayers (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7102-7102 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nd-Co and Nd-FeCo amorphous films are known to have larger Kerr rotation θk at shorter wavelength and ultraviolet light compared with other RE-TM (rare earth-transition) amorphous films. This property is desirable for MO (magneto-optical) media for the next generation. In order to satisfy the perpendicular magnetization condition, we replaced a part of Nd by Gd to decrease the saturation magnetization Ms and applied the multilayer (ML) structure to enhance the perpendicular anisotropy Ku. Then we succeeded in getting a new ML medium of Nd0.34Gd0.66/Fe0.9Co0.1 with a bilayer period of 1 nm. However, the substitution of 66% Gd resulted in undesirable decreases of Kerr rotation and coercivity. In this experiment, a part of Nd is replaced by either Tb or Dy instead of Gd with an expectation that the amount of replacement to get the perpendicular magnetization configuration may be smaller since Tb and Dy have large one ion anisotropy compared with Gd. The magnetic and MO properties of Nd(Tb,Dy)/FeCo MLs will be reported. In the case of Tb, for example, a square Kerr hysteresis loop is obtained by the substitution of about 40%. However, θK at 400 nm is about 0.30°, which is larger than that of Tb-FeCo but smaller than NdGd/FeCo MLs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356713
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetostriction in RE-Co amorphous alloy films (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6769-6769 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Rare earth-transition metal (RE-TM) amorphous films have been used as magneto-optical recording media. One of the most important properties is the perpendicular magnetic anisotropy, the main origin of which is explained by one ion anisotropy of rare earth ion. However, it is also noted that the anisotropy contribution due to the magnetostriction depends in a very similar manner on the RE species as in the case of the main anisotropy. Thus it was suggested that the main origin of the magnetostriction might be the one ion anisotropy of RE. The present work reports the saturation magnetostriction constant λs of various RE-Co amorphous alloy films with RE=Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er in the range of RE concentration of 0%–40%. In most cases, λs increases with RE concentration, then decreases after showing a peak and disappears altogether with ferromagnetism. For an RE species with a small one ion anisotropy, λs is small with a value of less than 2×10−5, and is found to be contributed primarily from Co. For RE with larger one ion anisotropy, namely for RE=Sm, Pr, Tb, and Dy, λs has values of the order of 10−4 and is estimated to be contributed mainly from RE one ion anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356823
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  • 4
    Electronic Resource
    Electronic Resource
    Photodissociation dynamics of Ar+3 (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 3588-3596 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The nonadiabatic trajectory calculations were performed for the photodissociation process of Ar3+. Two methods—hemiquantal dynamics and Tully's surface-hopping method—were applied and the results were compared. The calculated velocities of the photofragments had slow and fast bimodal distributions, as were experimentally observed. The ratio of the slow Ar+ fragment to the fast one decreased with the excitation wavelength, also in good agreement with the experimental results. It was shown that the slow component of Ar+ was produced only through the nonadiabatic transition during the photoissociation process, and that the nonadiabatic transition was dependent on the excitation energy. In addition, the vibrational motion, especially the bending motion, was shown to play an important role in the nonadiabatic process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466155
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal stability of NdGd/FeCo multilayers : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7090-7092 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thermal stability has been investigated for the structure and the perpendicular anisotropy Ku of Nd44Gd56/Fe89Co11 multilayer films with the bilayer period of 1 nm, where Ku becomes the maximum. From the results of isothermal annealing at temperature Ta, it has been found that the saturation magnetization Ms scarcely changes up to Ta=400 °C, while Ku is almost constant up to Ta=200 °C but decreases rather quickly for Ta above 200 °C. The decrease in Ku for Ta(approximately-greater-than)260 °C is accompanied by the decrease in the peak intensity of low angle x-ray diffraction, namely by the deterioration of the layered structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356738
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  • 6
    Electronic Resource
    Electronic Resource
    Enamel tensile bond strength and morphology of resin–enamel interface created by acid etching system with or without moisture and self-etching priming system (2002)
    Oxford UK : Blackwell Science Ltd
    Journal of oral rehabilitation 29 (2002), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The purpose of this study was to estimate the effect of three types of different adhesive systems on enamel adhesion. Scotchbond Multi-Purpose (MP) as a traditional system, Single Bond (SB) as a wet-bonding system and Clearfil SE Bond (SE) and Unifil Bond (UB) as self-etching priming systems were used. Bovine enamel was treated with each system and tensile bond strength (TBS) of resin to the enamel was measured. The conditioned enamel surfaces and resin–enamel interfaces were also morphologically observed with scanning electron microscope (SEM). The mean TBS for MP, SB, SE and UB were 15·3, 13·7, 14·3 and 11·6 MPa, respectively. There was no significant difference in mean TBS among all products but the traditional system showed the most stable TBS. In SEM observations, self-etching primer created a weaker etched pattern on the enamel surface than phosphoric acid. At the resin–enamel interfaces, thick tag-like extensions penetrated into the enamel etched with phosphoric acid regardless of using the wet-bonding technique, while self-etching primer created thin lamina-like resin penetrations. These results indicate that the traditional system with phosphoric acid etching exhibits the most stable enamel adhesion although the enamel-bonding promoting abilities of these adhesive systems are equivalent to each other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.2002.00855.x
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  • 7
    Electronic Resource
    Electronic Resource
    Ebastine inhibits T cell migration, production of Th2-type cytokines and proinflammatory cytokines (2003)
    Oxford, UK : Blackwell Science Ltd
    Clinical & experimental allergy 33 (2003), S. 0 
    Details
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background  Cytokine imbalance and cellular migration to inflammatory sites are critical components of allergic diseases. Redirecting cytokine imbalance and inhibiting cell migration therefore represent important therapeutic strategies for the treatment of these disorders.Objectives  To study the in vitro effect of ebastine, a novel non-sedating H1 receptor antagonist, on cytokine secretion and migration of activated T cells, as well as production of pro-inflammatory cytokines by macrophages.Methods  Peripheral T cells obtained from healthy volunteers were cultured in wells coated with the combination of anti-CD3 monoclonal antibody (mAb) and anti-CD26 mAb, anti-CD3 mAb and anti-CD28 mAb, or anti-CD3 mAb with PMA, in the presence or absence of ebastine. T cell proliferation and the production of cytokines were measured by [3H]thymidine incorporation assay and ELISA, respectively. In addition, transendothelial migration of T cells and production of pro-inflammatory cytokines by macrophages were examined.Results  Ebastine inhibited T cell proliferation and the production of IL-4, IL-5, IL-6, and TNF-α by T cells under each co-stimulatory condition tested, whereas it exhibited no effect on the production of IL-2 or IFN-γ. In addition, T cell migration and the production of such pro-inflammatory cytokines as TNF-α and IL-6 by macrophages were inhibited by ebastine.Conclusions  These results indicate that ebastine has a specific inhibitory effect on Th2-type cytokine production. Moreover, ebastine inhibited T cell migration and pro-inflammatory cytokine production by T cells and macrophages, suggesting that ebastine might be useful for the treatment of T cell-mediated allergic inflammatory disorders, including asthma, atopic dermatitis, and Th2-type autoimmune diseases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2222.2003.01701.x
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  • 8
    Electronic Resource
    Electronic Resource
    Correlation of electron density and spin-exchange interaction in dimeric copper(II) formates, acetates and silanecarboxylates (1991)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 344-355 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768190012459
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  • 9
    Electronic Resource
    Electronic Resource
    Chemiluminescence of neutrophil accumulation in liver following ischemia-reperfusion (1994)
    Springer
    Inflammation research 41 (1994), S. C221 
    Details
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The median and left lateral lobes of rat liverin situ were rendered ischemic for 30 min, then blood flow re-instituted. After 1, 3, 6, 24, or 48 h livers were removed and set up for isolated perfused organ study. Luminol enhanced chemiluminescence (LEC) was recorded from the surface of the median and left lateral lobe before and for 90 min following phorbol myristate acetate PMA (1.6×10−8 M) perfusion. An increase in PMA induced luminol enhanced chemiluminescence was evident at 1 h, and continued to increase up to 6 h. By 24 h the magnitude of the PMA response had returned to within control values. This indicates that a large influx of inflammatory cells had occurred in the liver following thein vivo ischemia-reperfusion insult, and that these cells gave a very large and sustained burst of radical production on stimulation with PMA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01987645
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  • 10
    Electronic Resource
    Electronic Resource
    The calcium-magnesium-deficient rat: A study on the distribution of calcium in the spinal cord using the electron probe microanalyser (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 1225-1226 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Using the scanning electron probe X-ray microanalysis technique, calcium distribution in the spinal cord of the calcium-magnesium-deficient rat was studied. Calcium accumulations were observed within and around the perikaryon of certain unspecified motoneurons in the spinal cord.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01922343
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