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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.
Yamaji, Minoru,Hakoda, Yuuma,Horimoto, Ami,Okamoto, Hideki Korean Society of Photoscience 2014 Rapid communication in photoscience Vol.3 No.4
Novel diphenylphenanthrenes (DPPs) were prepared by a photocyclization method, and the substituent effects of the phenyl groups on the photophysical properties of the phenanthrene chromophore were investigated based on measurements of fluorescence yields, lifetimes, and transient absorption. Fluorescence activities in DPPs are increased by introducing phenyl rings that can enhance the transition moment along the short axis of the phenanthrene skeleton. Intersystem crossing from the fluorescent states to the triplet manifolds is shown to be operative through the triplet-triplet absorption spectra obtained by laser photolysis techniques.
Toshihiro Maki,Hiroumi Horimoto,Takashi Ishihara,Kazuya Kofuji 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.3
This paper proposes a method for autonomous underwater vehicles to chase sea turtles without attaching any tag to them, toward efficient and long-term observation of marine life. The method uses a multibeam imaging sonar as the main sensor to detect sea turtles. The method utilizes convolutional neural network (CNN) for detecting a sea turtle in sonar imagery. Surge and yaw movements of the vehicle are controlled to maintain the relative distance and direction to the detected target. The proposed method was implemented in the AUV HATTORI. The AUV succeeded in tracking a sea turtle in natural condition for 270 seconds in shallow sea.
Yujiro Ichikawa,Takehisa Watanabe,Yasuhide Horimoto,Katsumi Ishii,Suekazu Naito 한국대기환경학회 2018 Asian Journal of Atmospheric Environment (AJAE) Vol.12 No.3
Quantitative data of 50 non-polar organic compounds constituting PM2.5 were continuously collected and analyzed from June 2016 to October 2017 (approximately 17 months) at Ichihara, one of the largest industrial areas in Japan. Target nonpolar organic compounds including 21 species of polycyclic aromatic hydrocarbons (PAHs), 24 species of n-alkanes and 5 species of phthalate esters (PAEs) were simultaneously measured by gas chromatography/mass spectrometry. Basically, the average concentrations of the total PAHs, n-alkanes and PAEs in each season remained nearly level, and seasonal variations were little throughout the study period. These results suggest that the emission sources, which are not influenced by the seasons, are the dominant inputs for the target organic compounds. Diagnostic ratios of PAHs, assessment of n-alkane homologue distributions, carbon preference index, and the contribution of wax n-alkanes from plants were used to estimate source apportionments. These results indicate that anthropogenic sources were the main contributor for most PAHs and n-alkanes throughout the study period. The concentrations of PAEs selected in this study were low because emission amounts of these chemicals were little within the source areas of the sampling site. To our knowledge, this study is the first attempt to simultaneously measure a high number of non-polar organic compounds in PM2.5 collected from the ambient air of Japan, and the resultant data will provide valuable data and information for environmental researchers.
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.