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- 저자 : N.Horimoto (검색결과 2 건)
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Taiga Horimoto,Masaji Koshioka,Satoshi Kubota,Lewis N. Mander,Nobuhiro Hirai,Nobuaki Ishida,서정근,이애경,Mark S. Roh 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.3
Germination of Styrax japonicus seeds is promoted by warm stratification (WS) at 18-20°C followed by cold stratification (CS) at 4-5℃. The objective of this work was to analyze the state and mobility of water molecules measured by 1H-NMR and endogenous gibberellins (GAs) and abscisic acid (ABA) by ultra performance liquid chromatography/mass spectrometry/mass spectrometry (UPLC-MS/MS) as influenced by WS and CS treatments had not previously been investigated. Styrax seeds that received 35 days of WS (35D WS) followed by 63 days of CS (63D CS) (35D WS + 63D CS) germinated. Seeds that received only 35D WS failed to germinate. Endogenous GA_1, GA_8, GA_(19), GA_(20), and GA_(53) were identified as well as GA_(17), GA_(23), GA_(28), GA_(29), and GA_(97) by gas chromatography/MS (GC/MS) and UPLC-MS/MS in seeds that were treated with warm and cold stratification (WS + CS). This suggests that the early C-13 hydroxylation pathway [-GA_(53)-(GA_(44))-GA_(19)-GA_(20)-GA_1-GA_8] of GAs is a major biosynthetic pathway in the seeds. The concentration of GA_(53) and GA_(19) increased following WS and that of GA_(53) increased after WS + CS. The concentration of GA_(19) increased only slightly after WS + CS. The concentration of GA1 increased only after WS + CS. ABA concentration significantly decreased following the WS treatment. It is concluded that the mobility of water molecules and water content in cotyledons and endosperm is increased following WS + CS treatments. The occurrence of C-13 hydroxylated GAs suggests that the early C-13 hydroxylation pathway, → GA_(53) → GA_(44) → GA_(19) → GA_(20) → GA_1 → GA_8, is a major biosynthetic pathway in Styrax seeds.
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Subsurface Formation of Oxygen on a Ru(0001) Surface
J.H.Kim,J.H.Lee,H.Kato,N.Horimoto,M.Kawai,Y.S.Lee 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.3
The formation of subsurface oxygen on a clean and sputtered Ru(0001) surface is studied using thermal desorption spectroscopy (TDS) and low energy electron diffraction (LEED). The oxygen was incorporated by exposing the surface to a partial oxygen pressure in the range of 10$^{-8}$$-$10$^{-9}$ Torr. By monitoring the signal of recombinatively desorbed molecular oxygen as a function of sample temperature, we found that oxygen molecules penetrated into the subsurface region after saturating the adsorbed layer characterized by the p(2 $\times$ 2) LEED pattern indicative of 0.25 monolayers (1 ML = 1.58 $\times$ 10$^{15}$ cm$^{-2}$). In contrast, the defects generated by Ar$^+$ sputtering on the Ru surface appear at thermally more stable sites in high-temperature O$_2$ thermal desorption states.
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