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Photoautotrophic Growth and Net Photosynthetic Rate of Sweet Potato Plantlets In Vitro as Affected by the Number of Air Exchanges of the Vessel and Type of Supporting Material

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Tsinghua Science and Technology 2006年第4期11卷 481-489页

作者：肖玉兰 kozai toyoki Faculty of Horticulture Chiba University MatsudoChiba 271-8510 Japan Yangtze Delta Region Institute of Tsinghua University Zhejiang Jiaxing 314100 China Faculty of Horticulture Chiba University Matsudo Chiba 271-8510 Japan

To produce high-quality sweet potato plantlets rapidly at low production costs, single nodal leafy cuttings of sweet potato （Ipomoea batatas （L.） Lam.） plantlets were cultured in vitro for 14 days on sugarand phytohormone-free Murashige and Skoog （MS） liquid medium, at a photosynthetic photon flux （PPF） of 200 μmol.m^-2.s^-1 and a CO2 concentration （v/v） of 1.8×10^-3. A factorial experiment was conducted with two levels of the number of air exchanges of the vessel （NAE）, 8.7-12.2 h^-1 and 〉12.2 h^-1, and two types of supporting material, vermiculite and Florialite （a porous material）. The control treatment consisted of a pho- tomixotrophic culture using a sugar- and NAA-containing agar MS medium with an NAE of 2.4 h^-1. PPF and CO2 concentrations were the same as the photoautotrophic treatments. In comparison with the control treatment, the photoautotrophic treatments with NAE of 8.7-12.2 h^-1 （MF treatment） and ≥12.2 h^-1 （HF treatment） were, respectively, 2.2 and 2.8 times in dry weight, and 3.7 and 4.2 times in net photosynthetic rate, when Florialite was used. The survival percentages of the plantlets in the field were, respectively, 86% and 97% in the MF and HF treatments, and 35% and 46% higher than that in the control treatment. The plantlets cultured with Florialite showed greater growth, compared with those cultured with vermiculite. Photoautotrophic micropropagation system with high NAE and the use of porous supporting material can produce high-quality plantlets and make it possible to reduce production costs.

关键词： micropropagation photomixotrophic photoautotrophic CO2 enrichment relative humidity sur-vival percentage

Estimating EC and ionic EC contribution percentage of nutrient solution based on ionic activity

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International Journal of Agricultural and Biological Engineering 2019年第2期12卷 42-48页

作者： Jinxiu Song Lin Xu Dongxian He Satoru Tuskagoshi toyoki kozai Yutaka Shinohara Key Laboratory of Agriculture Engineering in Structure and Environment of Ministry of Agriculture and Rural Affair China Agricultural UniversityBeijing 100083China Chiba University KashiwaChiba 277-0882Japan Japan Plant Factory Association KashiwaChiba 277-0882Japan

The dynamic monitoring technology of inorganic ions using ion selective electrodes has some problems such as low precision,vulnerability to other ions,short service life,and high *** to the difficulty of dynamic control based on ionic concentration of nutrient solution,EC and pH values of nutrient solution are often used as feedback control indexes in hydroponic *** this study,estimation algorisms of EC and ionic EC contribution percentage based on ionic activity were proposed to understand the quantitative relationship between ionic concentration and *** a view to predicting the EC accurately by mean ionic activities of specific salts in nutrient solution based on a specific formula,ionic concentration could also be calculated by the actual measurement of EC combined with ionic EC contribution *** Japanese horticultural experimental nutrient formula and Yamasaki tomato nutrient formula,significant linear correlations between estimated EC and measured EC were found with determination coefficients over *** EC contribution percentage was not affected by different relative concentrations of nutrient ***,ionic EC contribution percentage changed significantly when adding specific salts with different concentrations,and different changes were found in each anions and cations of specific salt *** the same K+concentration was added in different forms of KNO_(3),K_(2_SO_(4),KCl,and KH_(2)PO_(4),the changes of ionic EC contribution percentage of K^(+)were similar,but those of other anions in potassium salts varied *** relative errors of estimated EC of nutrient solutions based on ionic activities were only 1.3%in horticultural experimental nutrient solution and 1.8%in Yamasaki tomato nutrient solution with different relative concentrations compared to measured *** relative errors of estimated EC of nutrient solutions with specific salt added were only 0.1%-0.5%compared to measured EC in two nutrient solution.T

关键词： hydroponics nutrient solution ionic activity soilless culture Debye-Hückel limiting equation ionic EC contribution percentage nutrient formula solution dynamic control

Commercialized Closed Systems with Artificial Lighting for High Quality Plant Production at Low Costs

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Commercialized Closed Systems with Artificial Lighting for H...

Research career of an astronomer who has studied celestial mechanics

国际农业工程大会

作者： toyoki kozai Eiji Goto Yasuhiro Ishigami Changhoo Chun Faculty of Horticulture Chiba Univ. Matsudo 271-8510 Faculty of Horticulture Chiba Univ. Matsudo 271-8510 Faculty of Horticulture Chiba Univ. Matsudo 271-8510 Soul National University

＜正＞ A ’closed plant production system’ or simply a ’closed system’ has been commercialized for production of transplants, herb plants and leafy vegetables in Japan since 2002, largely based upon our research. The closed system is characterized by a warehouse-like structure covered with opaque thermal insulators, in which ventilation is kept at a minimum, and artificial light is used as the sole light source for plant growth.

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Research in Astronomy and Astrophysics 2016年第9期16卷 1-6页

作者： Yoshihide kozai National Astronomical Observatory of Japan MitakaTokyo 181-8588Japan

Celestial mechanics has been a classical field of astronomy. Only a few astronomers were in this field and not so many papers on this subject had been published during the first half of the 20th century. However, as the beauty of classical dynamics and celestial mechanics attracted me very much, I decided to take celestial mechanics as my research subject and entered university, where a very famous professor of celestial mechanics was a member of the faculty. Then as artificial satellites were launched starting from October 1958, new topics were investigated in the field of celestial mechanics. Moreover, planetary rings, asteroids with moderate values of eccentricity, inclination and so on have become new fields of celestial mechanics. In fact I have tried to solve such problems in an analytical way. Finally, to understand what gravitation is I joined the TAMA300 gravitational wave detector group.

关键词： celestial mechanics -- occultation -- minor planets -- asteroids general -- planets andsatellites general -- planets and satellites rings -- artificial satellite -- gravitational waves

Middle Jurassic spinicaudatan Shizhuestheria from the Sichuan Basin and its ontogenetic implication

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Science China Earth Sciences 2009年第12期52卷 1962-1968页

作者： HIRANO Hiromichi kozai Takeshi SAKAI Takashi Department of Earth Sciences School of Education Waseda University Tokyo 169-8050 Japan Laboratory Geosciences Faculty of Science Naruto University of Education Tokushima 772-8502 Japan Department of Earth and Planetary Sciences Kyushu University Fukuoka 810-8560 Japan

The diagnosis of the Middle Jurassic spinicaudatan genus Shizhuestheria is revised following the re-examination under a scanning electron microscope of a type specimen from Yanxi of Shizhu, and the newly collected specimens from Xintiangou of Chengjiang Town, Beibei, Chongqing. Small-sized reticulations occur not only in the middle-sized reticulations on growth bands on the dorsal side of the carapace, but also on growth bands on the ventral side of the carapace, which have been overlooked in the original description. The shift from wide dorsal growth bands to narrow ventral ones might indicate an onset of sexual maturity, and the transition in biological priorities from rapid juvenile growth to reproductive activities.

关键词： spinicaudatan Middle Jurassic ontogeny biostratigraphy Sichuan Basin

Direct correlation of radiolarian Kilinora spiralis Zone with the Late Jurassic ammonite faunal succession in the Kurisaka Formation, Kurosegawa Terrane, SW Japan

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Science China Earth Sciences 2009年第12期52卷 1910-1923页

作者： ISHIDA Keisuke TSUJINO Yasuyuki kozai Takeshi SATO Tadashi HIRSCH Francis Laboratory of Geology Institute of SAS Faculty of Science University of Tokushima Tokushima 770-8502 Japan Tokushima Prefectural Museum Bunka-no-Mori Park Tokushima 770-8070 Japan Laboratory of Geosciences Naruto University of Education Naruto 772-8502 Japan Fukada Geological Institute Hon-Komagome 2-13-12 Bunkyo-Ku Tokyo 113-0021 Japan

The last appearance datum of the radiolarian Kilinora spiralis is recorded above the first appearance datum of the ammonite Ataxioceras (A.) kurisakense in the Todoro Section of the Kurisaka Formation, Southern Kurosegawa Terrane, Shikoku, SW Japan. The constraint by ammonite age prolongs the range of the Kilinora spiralis Zone, a remarkable Jurassic radiolarian zone in Japan-NW Pacific region, into the lower Kimmeridgian. The direct correlation of the Kilinora spiralis zone with the Late Jurassic ammonite faunal succession in the Kurisaka Formation will provide a clue to the still pending chronological difference between European and North American radiolarian zones.

关键词： Late Jurassic LAD of Kilinora spiralis radiolarian zonation FAD of Ataxioceras (A.) kurisakense Kurisaka Formation Kurosegawa Terrane SW Japan

Reduction behaviors of permanganate by microbial cells and concomitant accumulation of divalent cations of Mg2+, Zn2+, and Co2+

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Journal of Environmental Sciences 2019年第12期31卷 78-86页

作者： Tomoaki Kato Qianqian Yu Kazuya Tanaka Naofumi kozai Takumi Saito Toshihiko Ohnuki School of Environment and Society Tokyo Institute of Technology2-12-1 OofcayamaMeguro-fcuTokyo 152-8550Japan School of Earth Science China University of GeosciencesWuhan 430074China Advanced Science Research Center Japan Atomic Energy AgencyTokaiIbaraki 319-1195Japan Institute of Innovative Research Tokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo 152-8550Japan The University of Tokyo 7-3-1 HongoBunkyo-kuTokyo 113-8654Japan

Permanganate treatment is widely used for disinfection of bacteria in surface-contaminated *** this paper,the fate of the dissolved permanganate in aqueous solution after contact with cells of Pseudomonas fluorescens was *** accumulation of divalent cations of Mg2+,Zn2+,and Co2+during precipitation of Mn oxides was also *** time course of the Mn concentration in solution showed an abrupt decrease after contact of Mn(VII)with microbial cells,followed by an increase after^24 *** analysis of the precipitated Mn oxides,called biomass Mn oxides,showed the formation of low-crystalline *** spectroscopy and X-ray absorption near edge structure(XANES)analyses indicated that dissolved Mn(VII)was reduced to form biomass Mn oxides involving Mn(IV)and Mn(III),followed by reduction to soluble Mn(II).The numbers of electron transferred from microbial cells to permanganate and to biomass Mn oxides for 24 hr after the contact indicated that the numbers of electron transfer from microbial cell was approximately 50 times higher to dissolved permanganate than to the biomass Mn oxides in present experimental *** 24 hr accumulation of divalent cations during formation of biomass Mn oxides was in the order of Co2+>Zn2+>Mg2+.XANES analysis of Co showed that oxidation of Co2+to Co3+resulted in higher accumulation of Co than Zn and ***,treatment of surface water by KMnO4 solution is effective not only for disinfection of microorganisms,but also for the elimination of metal cations from surface water.

关键词： Permanganate Cobalt Zinc Biomass Mn oxides Birnessite XANES

Hemosuccus pancreaticus: Problems and pitfalls in diagnosis and treatment

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World Journal of Gastroenterology 2008年第17期14卷 2776-2779页

作者： Yoshikazu toyoki Kenichi Hakamada Shunji Narumi Masaki Nara Keinosuke Ishido Mutsuo Sasaki Department of Gastroenterological Surgery Hirosaki University School of Medicine

Hemosuccus pancreaticus is a rare cause of intermittent upper gastrointestinal bleeding. We report two cases of hemosuccus pancreaticus with multiple episodes of upper gastrointestinal bleeding. The causes of hemorrhage were rupture of pseudoaneurysm of the splenic artery and bleeding from the wall of pancreatic pseudocyst. Interventional radiology is the first modality for early diagnosis and possible treatment of hemosuccus pancreaticus. When angiography shows no abnormal findings or interventional radiological therapy can not be successful, surgery should be considered without delay. Our patients herein underwent surgery without recurrence or sequelae. Intraoperative ultrasonography and pancreatoscopy were helpful modalities for confirming the source of hemorrhage and determining the cutting line of the pancreas. When we encounter intermittent upper gastrointestinal bleeding with an obscure source, hemosuccus pancreaticus should be included in differential diagnoses especially in patients with chronic pancreatitis, which would lead to a prompt and proper treatment.

关键词： Hernosuccus pancreaticus Gastrointestinalbleeding Interventional radiology Intraoperativesonography Intraoperative pancreatoscopy

A case of invasive hemolymphangioma of the pancreas

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World Journal of Gastroenterology 2008年第18期14卷 2932-2934页

作者： Yoshikazu toyoki Kenichi Hakamada Shunji Narumi Masaki Nara Daisuke Kudoh Keinosuke Ishido Mutsuo Sasaki Department of Gastroenterological Surgery Hirosaki University School of Medicine 5 Zaifu-cho Hirosaki Aomori 0368652 Japan

Hemolymphangioma of the pancreas is a very rare benign tumor. There were only five reports of this disease until March 2008. Herein, we report a case of hemolymphangioma of the pancreas with gastrointestinal bleeding due to duodenal invasion. A 53-year-old man had been admitted a referral hospital because of severe anemia due to gastrointestinal bleeding in December 2005. He was then transferred to our institute with a diagnosis of a tumor of the head of the pancreas with duodenal invasion in January 2006. No abnormalities were revealed except for anemia in laboratory data including CEA and CA19-9. Gastrointestinal endoscopy revealed bleeding at the duodenum. Computed tomography also demonstrated a heterogenous mass at the pancreatic head and suspected invasion to the duodenal wall. Ultrasonography showed a huge mass at the pancreatic head with a mixture of high and low echoic areas. Pylorous-preserving pancreatoduodenectomy was performed. The pancreatic tumor was soft and had invaded to the duodenum. The pathological diagnosis was a hemolymphangioma of the pancreas invaded to the duodenum. His postoperative course was uneventful and he was discharged on the 26th d after surgery. Hemolymphangioma of the pancreas is a very rare benign tumor. In a literature review until March 2008, we found five case reports. Major symptoms are abdominal pain and distension due to the enlarged tumor. However, we experienced a case of hemolymphangioma of the pancreas with gastrointestinal bleeding due to invasion to the duodenum. This disease is a very rare entity, but should be considered when patients have gastrointestinal bleeding.

关键词： Hemolymphangioma Duodenal invasion Gastrointestinal bleeding