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Ishida, Noriko,Iyoda, Yumi,Mitamura, Osamu,Choi, Jun-Kil The Korean Society of Limnology 2008 생태와 환경 Vol.37 No.1
The abundance and community structure of epilithic diatoms grown on different substrata were investigated in two first-order streams located in a limestone and granite area, north of the Suzuka Mountains in Central Japan. Experiments were conducted as follows: limestone and granite without algae were submerged in their own streambed or another stream station and incubated for seven weeks, while limestone and granite with algae were transferred to another stream station and incubated at the same time. The diatom biomass was consistently high in the lime-stone station experiments compared to those at the granite station. In addition, there was more diatom biomass on granite substrata than on the limestone substrata at both stations. The present results suggested that the difference in water chemistry including the major nutrient concentrations was the limiting factor for algal growth in these two streams; however, when the water chemistry was the same in each stream, the difference in substratum characteristics became the important factor affecting the diatom abundance. The diatom community grown on the transferred substrata with and without algae became similar to those grown on the original substrata in each stream during the incubation period. It was suggested that the effect of the substrata characteristics on the diatom community structure was rather small.
Chloroplastic NAD(P)H Dehydrogenase Complex and Cyclic Electron Transport around Photosystem I
Tsuyoshi Endo,Satoshi Ishida,Noriko Ishikawa,Fumihiko Sato 한국분자세포생물학회 2008 Molecules and cells Vol.25 No.2
Recent molecular genetics studies have revealed that cyclic electron transport around photosystem I is essential for normal photosynthesis and growth of plants. Chloroplastic NAD(P)H dehydorgenase (NDH) complex, a homologue of the complex I in respiratory electron transport, is involved in one of two cyclic pathways. Recent studies on the function and structure of the NDH complex are reviewed
Mitamura, Osamu,Tachibana, Junji,Ishida, Noriko,Seike, Yasushi,Choi, Jun-Kil The Korean Society of Limnology 2009 생태와 환경 Vol.37 No.2
Primary production of epiphytic and planktonic algae in a shallow reed zone of a lagoon Nishinoko was investigated. Concentrations of nutrients varied widely horizontally and locally in the lagoon. It seems that the reed zone has a heterogeneous environment. The photosynthetic rates of epiphytic and planktonic algae were 7 to 14 mg C surface stem $m^{-2}hr^{-1}$ and 12 to $46mg\;Cm^{-3}hr^{-1}$, respectively. The areal primary production of epiphytic algae was estimated as 4 to $13mg\;Cm^{-2}hr^{-1}$ from the stem density of Phragmites and the water depth at each station. The production of phytoplankton, on the other hand, was 5 to $56mg\;Cm^{-2}hr^{-1}$. The contribution of epiphytic algae to total primary production averaged 53%, although the assimilation number was much lower than that of phytoplankton. The present results indicate that the epiphytic algae are one of the significant primary producers in the reed zone.
Searching for cosmic missing baryons with DIOS - Diffuse Intergalactic Oxygen Surveyor -
Yasushi Suto,Akihiro Furuzawa,Kazuhisa Mitsuda,Manabu Ishida,Noriko Y. Yamasaki,Ryuichi Fujimoto,Shin Sasaki,Tae Furusho,Takaya Ohashi,Yoshitaka Ishisaki,Yuzuru Tawara 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
Approximately 30 to 50 percent of the total baryons in the present universe is supposed to take the form of wa arm/hot intergalactic medium (WHIM) whose X-ray continuum emission is very weak. In order to carry out a direct and homogeneous survey of elusive cosmic missing baryons, we propose a dedicated soft-X-ray mission, DIOS (Diffuse Intergalactic Oxygen Surveyor). The unprecedented energy resolution ( 2eV) of the XSA (X-ray Spectrometer Array) on-board DIOS enables us to identify WHIM with gas temperatures T = 106က7K and overdensity = 10က100 located at z < 0:3 through emission lines of Ovii and Oviii. DIOS, which will hopefully be launched in several years time, promises to open a new window of detection and characterization of cosmic missing baryons and to provide yet another important and complementary tool to trace the large-scale structure of the universe.
TRACING BRIGHT AND DARK SIDES OF THE UNIVERSE WITH X-RAY OBSERVATIONS
SUTO YASUSHI,YOSHIKAWA KOHJI,DOLAG KLAUS,SASAKI SHIN,YAMASAKI NORIKO Y.,OHASHI TAKAYA,MITSUDA KAZUHISA,TAWARA YUZURU,FUJIMOTO RYUICHI,FURUSHO TAE,FURUZAWA AKIHIRO,ISHIDA MANABU,ISHISAKI YOSHITAKA The Korean Astronomical Society 2004 Journal of The Korean Astronomical Society Vol.37 No.5
X-ray observations of galaxy clusters have played an important role in cosmology, especially in determining the cosmological density parameter and the fluctuation amplitude. While they represent the bright side of the universe together with the other probes including the cosmic microwave background and the Type Ia supernovae, the resulting information clearly indicates that the universe is dominated by dark components. Even most of cosmic baryons turns out to be dark. In order to elucidate the nature of dark baryons, we propose a dedicated soft-X-ray mission, DIOS (Diffuse Intergalactic Oxygen Surveyor). Recent numerical simulations suggest that approximately 30 to 50 percent of total baryons at z = 0 take the form of the warm-hot intergalactic medium (WHIM) with $10^5K < T < 10^7K $which has evaded the direct detection so far. The unprecedented energy resolution (${\~} 2eV$) of the XSA (X-ray Spectrometer Array) on-board DIGS enables us to identify WHIM with gas temperature $T = 10^6 {\~} 10^7K$ and overdensity $\delta$ = 10 ${\~}$ 100 located at z < 0.3 through emission lines of OVII and OVIII. In addition, WHIMs surrounding nearby clusters are detectable with a typical exposure time of a day, and thus constitute realistic and promising targets for DIOS.
Grain size distribution and chemistry of the brackish Lake sediment in Korea
I Chan Shin,Tetsuji Akatsuka,Hisayuki Azumi,Lan Ao,Nozomi Amahashi,Maki Oyagi,Noriko Ishida,Naoshige Goto,Masahiro Maruo,Akihiko Yagi,Yashshi Seike,Seung Hyun Lee,Sung Ae Yoon,Jun Kil Choi,Young Woong 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.5
To determine the grain size distribution and chemical characteristics of bottom surface sediments in shallow brackish lagoons, we studied sediment samples collected from the entire horizontal lake area and in vertical profiles from three stations in Lakes Youngrang and Hwajinpo, on the eastern coast of Korea. Vertical and horizontal grain size distributions of the bottom sediments indicated predominantly sand- and silt in both lakes. The vertical distribution of C/N ratios ranged from 6.14 to 11.92 in Lake Youngrang, and 6.74 to 12.34 in Lake Hwajinpo. The horizontal distribution of C/N ratios in Lake Youngrang ranged from 6.1 to 17.6, whereas they ranged from 4.4 to 12.1 in Lake Hwajinpo. C/N ratios showed locally different responses to the origin of allochthonous (partial region) and autochthonous (entire region) organic materials. Horizontally, bottom sediment with low δ<SUP>13</SUP>C and high δ<SUP>15</SUP>N in Lake Youngrang were likely to be influenced by autochthonous organic material derived from primary production, and would be affected by N inputs from sources. In contrast, high δ<SUP>13</SUP>C and low δ<SUP>15</SUP>N sediments in Lake Hwajinpo were likely to be influenced by cyanobacteria.