[en] Interaction of ethylene with the H-preadsorbed Pd(110) surface has been studied by the use of thermal desorption spectroscopy and high-resolution electron energy loss spectroscopy. On the Pd(110)(2 x 1)-H surface saturated with ethylene at 90 weakly-adsorbed ethylene exists in addition to the π-bonded ethylene. The fractional saturation coverage of ethylene is 0.2 which is nearly equal to that on the Pd(110) clean surface. The amount of ethane which is thermally desorbed is about 15 times as large as that from the Pd(110) clean surface. The ethane formation is promoted as the amount of preadsorbed hydrogen is increased. The H-D-exchange reaction for C₂D₄ postadsorption on the H-preadsorbed Pd(110) surface is discussed. Experimental evidences are given which indicate that the ethane formation and H-D-exchange reaction occur predominately via ethyl species. The interaction of hydrogen with the ethylene-preadsorbed Pd(110) surface is briefly described. 27 refs., 11 figs., 2 tabs

[en] Effects of phorbol esters and epidermal growth factor (EGF) on prostaglandin E₂ production by cultured porcine thyroid cells were examined. Both phorbol 12-myristate 13-acetate (PMA) and EGF stimulated prostaglandin E₂ production by the cells in dose related fashion. PMA stimulated prostaglandin E₂ production over fifty-fold with the dose of 10^-7 M compared with control. EGF (10^-7 M) also stimulated it about ten-fold. The ED₅₀ values of PMA and EGF were respectively around 1 x 10^-9 M and 5 x 10^-10 M. Thyroid stimulating hormone (TSH), however, did not stimulate prostaglandin E₂ production from 1 to 24-h incubation. The release of radioactivity from [³H]-arachidonic acid prelabeled cells was also stimulated by PMA and EGF, but not by TSH. These results indicate that both PMA and EGF are potent stimulators of prostaglandin E₂ production, associated with the activity to stimulate arachidonic acid release in porcine thyroid cells. 36 references, 2 figures, 1 table

No abstract available

[en] Suppression of the floating body effects in partially depleted SOI-MOSFETs (silicon-on-insulator metal oxide semiconductor field effect transistors) with and without body contact electrodes has been investigated using nuclear microprobes with currents of 5-250 pA. Transient SOI-MOSFET behavior with and without body contact electrodes during ion irradiation by three-dimensional computer simulation has also been compared with that using nuclear microprobes. The floating body effects were observed in SOI-MOSFETs without body contact electrodes by nuclear microprobe irradiation, while those were suppressed in the SOI-MOSFETs with body contacts

[en] The partial cross sections from the neutron capture state to the ground and first excited states in ⁸Li have been separately determined for the first time at stellar neutron energy. The direct and weak cascade γ rays from the capture and first excited states to the ground state were measured by means of anti-Compton NaI(Tl) and anti-Compton HPGe spectrometers, respectively. The γ-ray branching ratio and the cross sections thus determined agree with that for thermal neutrons assuming a 1/v neutron velocity dependence. By comparing the cross sections with calculations based on the nonresonant direct capture mechanism it is shown that the cross sections are sensitive to the interaction potential of the incident neutron with the ⁷Li target nucleus. This analysis confirms the possibility of deriving the parameters necessary for the calculation of the astrophysical S factor S₁₇(E) for the ⁷Be(p,γ)⁸B reaction in the upper energy range above 500 keV

[en] An NaI(Tl) spectrometer system has been installed to measure the cross section of a radiative neutron-capture reaction of a nucleus at an astrophysically relevant energy of between 10 and 500 keV. The system consists of two large anti-Compton NaI(Tl) spectrometers and a new data-taking system. The spectrometer can detect a discrete γ-ray emitted promptly from a neutron-capture state to its low-lying state, and the data-taking system can transfer events with much higher rates, about 30-times higher, compared to the existing system