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Journal Articles

Flow filtration/adsorption and simultaneous monitoring technologies of radiocesium $$^{137}$$Cs in river water

Enomoto, Kazuyuki*; Hoshina, Hiroyuki*; Kasai, Noboru*; Kurita, Keisuke; Ueki, Yuji*; Nagao, Yuto*; Yin, Y.-G.*; Suzui, Nobuo*; Kawachi, Naoki*; Seko, Noriaki*

Chemical Engineering Journal, 460, p.141696_1 - 141696_9, 2023/03

 Times Cited Count:1 Percentile:0.01(Engineering, Environmental)

This study develops a method that combines a radiation-grafting fibrous Cs-adsorbent filter of ammonium molybdophosphate (AMP) and a Ce:Gd$$_3$$Al$$_2$$Ga$$_3$$O$$_{12}$$ scintillator based $$gamma$$-ray detector for in situ measurements of the activity concentrations of $$^{137}$$Cs in a continuous water flow.

Journal Articles

"Live-autoradiography" technique reveals genetic variation in the rate of Fe uptake by barley cultivars

Higuchi, Kyoko*; Kurita, Keisuke; Sakai, Takuro; Suzui, Nobuo*; Sasaki, Minori*; Katori, Maya*; Wakabayashi, Yuna*; Majima, Yuta*; Saito, Akihiro*; Oyama, Takuji*; et al.

Plants (Internet), 11(6), p.817_1 - 817_11, 2022/03

 Times Cited Count:2 Percentile:58.59(Plant Sciences)

Genetic diversity in the rate of Fe uptake by plants has not been broadly surveyed among plant species or genotypes, although plants have developed various Fe acquisition mechanisms. We adopted the "Live-autoradiography" technique with radioactive $$^{59}$$Fe to directly evaluate the uptake rate of Fe by barley cultivars from a nutrient solution containing a very low concentration of Fe. Our observations revealed that the ability to acquire Fe from the low Fe solution was not always the sole determinant of tolerance to Fe deficiency among the barley genotypes.

Journal Articles

Noninvasive imaging of hollow structures and gas movement revealed the gas partial-pressure-gradient-driven long-distance gas movement in the aerenchyma along the leaf blade to submerged organs in rice

Yin, Y.-G.*; Mori, Yoshinao*; Suzui, Nobuo*; Kurita, Keisuke; Yamaguchi, Mitsutaka*; Miyoshi, Yuta*; Nagao, Yuto*; Ashikari, Motoyuki*; Nagai, Keisuke*; Kawachi, Naoki*

New Phytologist, 232(5), p.1974 - 1984, 2021/12

 Times Cited Count:7 Percentile:70.91(Plant Sciences)

Rice ($$Oryza sativa$$) plants have porous or hollow organs consisting of aerenchyma, which is presumed to function as a low-resistance diffusion pathway for air to travel from the foliage above the water to submerged organs. However, gas movement in rice plants has yet to be visualized in real time. In this study involving partially submerged rice plants, the leaves emerging from the water were fed nitrogen-13-labeled nitrogen ([$$^{13}$$N]N$$_2$$) tracer gas, and the gas movement downward along the leaf blade, leaf sheath, and internode over time was monitored.

Journal Articles

Autoradiography system with phosphor powder (ZnS:Ag) for imaging radioisotope dynamics in a living plant

Kurita, Keisuke; Sakai, Takuro; Suzui, Nobuo*; Yin, Y.-G.*; Sugita, Ryohei*; Kobayashi, Natsuko*; Tanoi, Keitaro*; Kawachi, Naoki*

Japanese Journal of Applied Physics, 60(11), p.116501_1 - 116501_4, 2021/11

 Times Cited Count:1 Percentile:11.39(Physics, Applied)

Radioisotope tracer imaging is useful for studying plant physiological phenomena. In this study, we developed an autoradiography system with phosphor powder (ZnS:Ag), "Live-autoradiography", for imaging radioisotope dynamics in a living plant. This system visualizes the element migration and accumulation in intact plants continuously under a light environment. An imaging test was performed on point sources of $$^{137}$$Cs, with a radioactivity of 10-100 kBq of being observed; this indicates satisfactory system linearity between the image intensity and the radioactivity of $$^{137}$$Cs. Moreover, dynamics imaging of $$^{137}$$Cs was performed on an intact soybean plant for four days. The serial images indicated $$^{137}$$Cs accumulation in the node, vein, and growing point of the plant. The developed system can be used for studying plant physiological phenomena and can be employed for quantitative measurement of radionuclides.

Journal Articles

Non-invasive $$^{11}$$C-imaging revealed the spatiotemporal variability in the translocation of photosynthates into strawberry fruits in response to increasing daylight integrals at leaf surface

Miyoshi, Yuta*; Hidaka, Kota*; Yin, Y.-G.*; Suzui, Nobuo*; Kurita, Keisuke; Kawachi, Naoki*

Frontiers in Plant Science (Internet), 12, p.688887_1 - 688887_14, 2021/07

 Times Cited Count:10 Percentile:82.69(Plant Sciences)

In this study, $$^{11}$$C-photosynthate translocation into strawberry fruits in individual plants was visualized non-invasively and repeatedly using a positron emission tracer imaging system (PETIS) to assess the spatiotemporal variability in the translocation dynamics in response to increasing daylight integrals. This is the first study to use $$^{11}$$C-radioisotopes to clarify the spatiotemporal variability in photosynthate translocation from source leaves to individual sink fruits in vivo in response to increasing daylight integrals at a high spatiotemporal resolution.

Journal Articles

Application of OpenPET as 3-D imaging device of carbon distribution in fruit

Kurita, Keisuke; Miyoshi, Yuta*; Nagao, Yuto*; Yamaguchi, Mitsutaka*; Suzui, Nobuo*; Yin, Y.-G.*; Ishii, Satomi*; Kawachi, Naoki*; Hidaka, Kota*; Yoshida, Eiji*; et al.

QST-M-29; QST Takasaki Annual Report 2019, P. 106, 2021/03

Journal Articles

Non-invasive imaging of radiocesium dynamics in a living animal using a positron-emitting $$^{127}$$Cs tracer

Suzui, Nobuo*; Shibata, Takuya; Yin, Y.-G.*; Funaki, Yoshihito*; Kurita, Keisuke; Hoshina, Hiroyuki*; Yamaguchi, Mitsutaka*; Fujimaki, Shu*; Seko, Noriaki*; Watabe, Hiroshi*; et al.

Scientific Reports (Internet), 10, p.16155_1 - 16155_9, 2020/10

 Times Cited Count:2 Percentile:28.65(Multidisciplinary Sciences)

Journal Articles

Visualising spatio-temporal distributions of assimilated carbon translocation and release in root systems of leguminous plants

Yin, Y.-G.*; Suzui, Nobuo*; Kurita, Keisuke; Miyoshi, Yuta*; Unno, Yusuke*; Fujimaki, Shu*; Nakamura, Takuji*; Shinano, Takuro*; Kawachi, Naoki*

Scientific Reports (Internet), 10, p.8446_1 - 8446_11, 2020/06

 Times Cited Count:10 Percentile:66.36(Multidisciplinary Sciences)

The release of rhizodeposits differs depending on the root position and is closely related to the assimilated carbon (C) supply. Therefore, quantifying the C partitioning over a short period may provide crucial information for clarifying root-soil carbon metabolism. A non-invasive method for visualising the translocation of recently assimilated C into the root system inside the rhizobox was established using $$^{11}$$CO$$_{2}$$ labelling and the positron-emitting tracer imaging system. The spatial distribution of recent $$^{11}$$C-photoassimilates translocated and released in the root system and soil were visualised for white lupin ($$Lupinus albus$$) and soybean ($$Glycine max$$). Our method enabled the quantification of the spatial C allocations in roots and soil, which may help to elucidate the relationship between C metabolism and nutrient cycling at specific locations of the root-soil system in response to environmental conditions over relatively short periods.

Journal Articles

On-line rapid purification of [$$^{13}$$N]N$$_2$$ gas for visualization of nitrogen fixation and translocation in nodulated soybean

Yin, Y.-G.*; Ishii, Satomi*; Suzui, Nobuo*; Igura, Masato*; Kurita, Keisuke; Miyoshi, Yuta*; Nagasawa, Naotsugu*; Taguchi, Mitsumasa*; Kawachi, Naoki*

Applied Radiation and Isotopes, 151, p.7 - 12, 2019/09

 Times Cited Count:6 Percentile:60.63(Chemistry, Inorganic & Nuclear)

Accurate analysis of N fixation in leguminous crops requires determination of N utilization within an intact plant$$;$$ however, most approaches require tissue disassembly. We developed a simple and rapid technique to generate high-purity and high-yield [$$^{13}$$N]N$$_2$$ gas and obtained real-time images of N fixation in an intact soybean plant. The purification efficiency was $$sim$$ 81.6% after decay correction.

Journal Articles

Non-invasive imaging of sodium dynamics in common reed using positron-emitting tracer imaging system

Suzui, Nobuo; Maruyama, Teppei*; Kawachi, Naoki; Miwa, Eitaro*; Higuchi, Kyoko*; Fujimaki, Shu

JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 95, 2016/02

Journal Articles

Imaging of radiocesium dynamics in soybean by using a high-resolution gamma camera

Yin, Y.-G.; Kawachi, Naoki; Suzui, Nobuo; Ishii, Satomi; Yoshihara, Toshihiro*; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu

JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 112, 2016/02

Journal Articles

Development of a gamma camera system for high-energy gamma photon for quantitative observation of $$^{137}$$Cs movement in a plant body

Kawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Ishii, Satomi; Yoshihara, Toshihiro*; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu

JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 94, 2016/02

Journal Articles

Evaluation of the effect of elevated concentrations of CO$$_{2}$$ in a greenhouse for tomato cultivation

Ishii, Satomi; Yamazaki, Haruaki*; Suzui, Nobuo; Yin, Y.-G.; Kawachi, Naoki; Shimada, Hiroaki*; Fujimaki, Shu

JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 93, 2016/02

Journal Articles

Imaging of radiocesium uptake dynamics in a plant body by using a newly developed high-resolution gamma camera

Kawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Ishii, Satomi; Yoshihara, Toshihiro*; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu

Journal of Environmental Radioactivity, 151(Part 2), p.461 - 467, 2016/01

 Times Cited Count:14 Percentile:44.02(Environmental Sciences)

Journal Articles

Base to tip and long-distance transport of sodium in the root of common reed [${it Phragmites australis}$ (Cav.) Trin. ex Steud.] at steady state under constant high-salt conditions

Fujimaki, Shu; Maruyama, Teppei*; Suzui, Nobuo; Kawachi, Naoki; Miwa, Eitaro*; Higuchi, Kyoko*

Plant & Cell Physiology, 56(5), p.943 - 950, 2015/05

 Times Cited Count:22 Percentile:67.05(Plant Sciences)

We analyzed the directions and rates of translocation of sodium ions (Na$$^{+}$$) within tissues of a salt-tolerant plant, common reed, and a salt-sensitive plant, rice, under constant high-salt conditions using radioactive $$^{22}$$Na tracer and a positron-emitting tracer imaging system (PETIS). First, the test plants were incubated in a nutrient solution containing 50 mM NaCl and a trace level of $$^{22}$$Na for 24 h (feeding step). Then the original solution was replaced with a fresh solution containing 50 mM NaCl but no $$^{22}$$Na, in which the test plants remained for over 48 h (chase step). Non-invasive visualization of $$^{22}$$Na movement in the test plants was conducted during feeding and chase steps with PETIS. Our results revealed that $$^{22}$$Na was absorbed in the roots of common reed, but not transported to the upper shoot beyond the shoot base. During the chase step, a basal-to-distal movement of $$^{22}$$Na was detected within the root tissue with a velocity of approximately 0.5 cm h$$^{-1}$$. On the other hand, $$^{22}$$Na that absorbed in the roots of rice was continuously translocated to the whole shoot. We concluded that the basal roots and the shoot base of common reed have constitutive functions of Na$$^{+}$$ exclusion only in the direction of root tips, even under constant high-salt conditions. This function may apparently contribute to the low Na$$^{+}$$ concentration in the upper shoot and high salt tolerance of common reed.

Journal Articles

Live-imaging evaluation of the efficacy of elevated CO$$_{2}$$ concentration in a closed cultivation system for the improvement of bioproduction in tomato fruits

Yamazaki, Haruaki*; Suzui, Nobuo; Yin, Y.-G.; Kawachi, Naoki; Ishii, Satomi; Shimada, Hiroaki*; Fujimaki, Shu

Plant Biotechnology, 32(1), p.31 - 37, 2015/04

 Times Cited Count:15 Percentile:53.29(Biotechnology & Applied Microbiology)

Journal Articles

Common reed accumulates starch in its stem by metabolic adaptation under Cd stress conditions

Higuchi, Kyoko*; Kanai, Masatake*; Tsuchiya, Masahisa*; Ishii, Haruka*; Shibuya, Naofumi*; Fujita, Naoko*; Nakamura, Yasunori*; Suzui, Nobuo; Fujimaki, Shu; Miwa, Eitaro*

Frontiers in Plant Science (Internet), 6, p.138_1 - 138_6, 2015/03

 Times Cited Count:18 Percentile:59.78(Plant Sciences)

Journal Articles

Evaluation of velocity of $$^{11}$$C-photoassimilate flow using positron-emitting tracer imaging system

Suzui, Nobuo; Kawachi, Naoki; Ishii, Satomi; Yin, Y.-G.; Iwasaki, Aya*; Ogawa, Kenichi*; Fujimaki, Shu

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 105, 2015/03

Journal Articles

Ultra-high resolution of radiocesium distribution detection based on Cherenkov light imaging

Yamamoto, Seiichi*; Ogata, Yoshimune*; Kawachi, Naoki; Suzui, Nobuo; Yin, Y.-G.; Fujimaki, Shu

Nuclear Instruments and Methods in Physics Research A, 777, p.102 - 109, 2015/03

 Times Cited Count:3 Percentile:27.05(Instruments & Instrumentation)

Journal Articles

Effects of glutathione concentration in the root zone and glutathione treatment period on cadmium partitioning in oilseed rape plants

Nakamura, Shinichi*; Kondo, Hikari*; Suzui, Nobuo; Yin, Y.-G.; Ishii, Satomi; Kawachi, Naoki; Rai, Hiroki*; Hattori, Hiroyuki*; Fujimaki, Shu

Molecular Physiology and Ecophysiology of Sulfur, p.253 - 259, 2015/00

 Times Cited Count:3 Percentile:73.12

327 (Records 1-20 displayed on this page)