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Effects of land use and changes in cover on the transformation and transportation of iron:A case study of the Sanjiang Plain,Northeast China

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Science China Earth Sciences 2011年第5期54卷 686-693页

作者： PAN XiaoFeng YAN BaiXing yoh muneoki Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Tokyo University of Agriculture and Technology Tokyo 1838509 Japan

Wetland reclamation has been ongoing in the Sanjiang Plain since the mid-1950s,which has resulted in major changes in wetlands and the agriculture ecosystem in the region that have influenced the iron output to the Sea of Okhotsk and limited the primary productivity in the North Pacific *** study was conducted to investigate the chemical forms of iron in different aquatic environments(agricultural water including groundwater,paddy water,and canal water;wetland water including marsh water,marsh streams,and main streams) with the cross-flow filtration method to reveal the transportation and transformation characteristics of iron in response to major land use *** addition,the factors affecting iron behavior in different water bodies were *** marsh water and streams,the concentrations of dissolved iron were higher due to the high organic matter contents and marsh water becoming the main iron source for river *** conversion of dissolved iron into acid-labile iron occurred during the discharge of wetland water into marsh *** primarily existed in both the >0.7 and <0.01 μm size fractions,accounting for about 58.3% and 26.4% of the total dissolved iron,*** agricultural irrigation systems,ferrous ion entered the paddy fields from groundwater,and a fraction of this ferrous iron was subsequently converted into high molecular weight and medium molecular weight iron(colloid iron) in paddy and canal ***,the concentrations of total dissolved iron decreased by 62.5% from underground to the surface due to the formation of *** this,water discharge in agriculture is still an important iron source for rivers and has the potential to supplement iron due to its higher acid-labile iron *** use and cover change and agricultural irrigation increased the iron content of surface soil,but reduced the output of iron in water ***,the concentration of total dissolved iron in water systems has be

关键词： land use and cover change marsh water marsh river agricultural water iron species Sanjiang Plain

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Temporal variability of iron concentrations and fractions in wetland waters in Sanjiang Plain, Northeast China

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Journal of Environmental Sciences 2010年第7期22卷 968-974页

作者： Xiaofeng Pan Baixing Yan muneoki yoh Lixia Wang Xiuqi Liu Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and A groecology Chinese Academy of Sciences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Tokyo University of Agriculture and Technology Tokyo 1838509 Japan

Chemical forms, reactivities and transformation of iron fractions in marshy waters were investigated with cross-flow filtration technique to study the iron environmental behavior. Iron fractions were divided into four parts： acid-labile iron （pre-acidification of unfiltered marshy water samples, 〉 0.7 μm）, high-molecular-weight iron （0.7-0.05 μm）, medium-molecular-weight iron （0.05-0.01 μm）, and low-molecular-weight iron （〈 0.01μm）. The cross-flow filtration suggested that iron primarily exist in both the 〉 0.7 μm and 〈 0.01 μm size fractions in marshy waters. Rainfall is the key for rain-fed wetland to determine fate of iron by changing the aquatic biochemical conditions. By monitoring the variation of iron concentrations and fractions over three years, it was found that dissolved iron and acid-labile iron concentrations exhibit a large variation extent under different annual rainfalls from 2006 to 2008. The seasonal variation for iron species proved that the surface temperature could control some conversion reactions of iron in marshy waters. Low- molecular-weight iron would convert to acid-labile iron gradually with temperature decreasing. The photochemical reactions of iron fractions, especially low-molecular-weight iron had occurred under solar irradiation. The relative proportion of low-molecular-weight in total dissolved iron ranging from 28.3% to 43.2% were found during the day time, which proved that the observed decreasing concentration of acid lability iron was caused by its degradation to low molecular weight iron.

关键词： iron species cross-flow filtration wetland waters photochemical behavior

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Fluorescence detection and imaging of cytosolic calcium oscillations:A comparison of four equipment setups

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Progress in Natural Science:Materials International 2009年第4期19卷 479-487页

作者： yoh-ichi Satohc Department of Histology Iwate Medical University School of Medicine Uchimaru 19-1

The increase in cytosolic calcium concentration has been shown to play an important role in vital cellular functions such as muscle contraction, cell secretion, oocyte fertilization, nerve conduction, embryo development and apoptosis in animals, plants and microbes, and in the invasion of mammalian cells by parasites, bacteria, and viruses. Therefore, live cell imaging of increases in cytosolic calcium concentration in cellular compartments has been investigated intensively. Multiple calcium imaging systems are now available commercially, but when it comes to deciding which model to purchase, it is often hard to obtain enough information for an optimal setup. In this paper, a comparison was made among four fluorescent detection/imaging devices for the detection of cytosolic calcium oscillations induced in rat pancreatic acinar cells by cholecystokinin and in hepatocytes by phenylephrine. Detailed equipment setup, differences in data acquisition and analysis, and side effects of the excitation light on live cells were analyzed. A list of important factors that should be considered in choosing the optimal equipment are recommended, which will be useful for users of such devices in the future.

关键词： Calcium measurement system Pancreatic acinar cells Hepatocytes Cytosolic calcium oscillations

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Retroperitoneal disorders associated with Ig G4-related autoimmune pancreatitis

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World Journal of Gastroenterology 2014年第44期20卷 16550-16558页

作者： Noboru Hara Makoto Kawaguchi Keisuke Takeda yoh Zen Division of Urology Department of Regenerative and Transplant Medicine Graduate School of Medical and Dental Sciences Niigata University Division of Molecular Oncology Department of Signal Transduction Research Graduate School of Medical and Dental Sciences Niigata University Division of Diagnostic Pathology Niigata Rousai Hospital Institute of Liver Studies King’s College Hospital

Ig G4-related autoimmune pancreatitis is frequently accompanied by relevant lesions in the genitourinary tract and retroperitoneal organs, which cause various clinical problems, ranging from non-specific back pain or bladder outlet obstruction to renal failure. The diagnosis of Ig G4-related retroperitoneal fibrosis requires a multidisciplinary approach, including serological tests, histological examination, imaging analysis, and susceptibility to steroid therapy. Radiological examinations are helpful to diagnose this condition, but surgical resection is occasionally unavoidable to exclude malignancy, particularly for patients with isolated retroperitoneal involvement. Steroid therapy is the treatment of choice for this condition, the same as for other manifestationsof Ig G4-related *** patients with severe ureteral obstruction,additional ureteral stenting needs to be considered prior to steroid therapy to preserve the renal *** papers have suggested that Ig G4-related disease can affect male reproductive organs including the prostate and *** G4-related prostatitis usually causes lower urinary tract symptoms,such as dysuria and *** sometimes state that corticosteroids given for Ig G4-related disease at other sites relieve their lower urinary tract symptoms,which leads us to suspect prostatic involvement in this *** of the limited number of publications available,further studies are warranted to better characterize Ig G4-related disease in male reproductive organs.

关键词： IgG4 Autoimmune pancreatitis Retroperitoneum Genitourinary tract Management

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Techniques for laparoscopic liver parenchymal transection

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Hepatobiliary Surgery and Nutrition 2019年第6期8卷 572-581页

作者： Tomoaki yoh Francois Cauchy Olivier Soubrane Department of Hepato-Pancreatico-Biliary Surgery and Liver Transplantation Beaujon HospitalClichyFrance Assistance Publique Hopitaux de ParisParisFrance Universite Paris VII Denis Diderot ParisFrance

Laparoscopic liver surgery has gained wide acceptance resulting in a paradigm shift of liver *** innovations and accumulation of surgeon’s experience have allowed laparoscopic liver resection(LLR)to become an effective procedure with favorable peri-and post-operative *** the overall process of LLR,liver parenchymal transection remains the most critical step with the aim of minimizing blood loss and secures the appropriate cutting line,i.e.,securing major vessels and obtaining adequate surgical margin clearance for *** preoperative imaging modalities and intraoperative ultrasonography findings may contribute to the best determination of the appropriate cutting line during the LLR;however,technical expertise in minimizing and controlling bleeding during liver parenchymal transection is still a challenge for safe LLR,and therefore represents a major concern for hepatobiliary *** with the historical fact that the technique of liver parenchymal transection itself is chosen according to surgeon’s preference and"savoir-faire",the best technical modality in laparoscopic liver parenchymal transection remains to be ***,better understanding the technical issue may serve a contribution to the standardization of *** review article therefore focuses on the technical aspects of the laparoscopic liver parenchymal transection.

关键词： Technique liver parenchymal transection laparoscopy

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Syngeneic implantation of mouse hepatic progenitor cell-derived three-dimensional liver tissue with dense collagen fibrils

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World Journal of Gastroenterology 2022年第14期28卷 1444-1454页

作者： Miho Tamai Eijiro Adachi Masaya Kawase yoh-ichi Tagawa School of Life Science and Technology Tokyo Institute of TechnologyYokohama-shi 226-8501Japan Faculty of Dental Medicine Hokkaido UniversitySapporo 060-8586Japan Department of Molecular Morphology Kitasato UniversityYokohama-shi 319-3526Japan Long-Term Care Health Facility Yasuragi Ibaraki Zip or Postal CodeJapan Nagahama Institute of Bio-Science and Technology Shiga 526-0829Japan

BACKGROUND Liver transplantation is a therapy for irreversible liver failure;however,at present,donor organs are in short *** transplantation therapy for liver failure is still at the developmental stage and is critically limited by a shortage of human primary *** To investigate the possibility that hepatic progenitor cells(HPCs)prepared from the portal branch-ligated hepatic lobe may be used in regenerative medicine,we attempted to enable the implantation of extracellular matrices containing organoids consisting of HPC-derived hepatocytes and non-parenchymal *** In vitro liver organoid tissue has been generated by accumulating collagen fibrils,fibroblasts,and HPCs on a mesh of polylactic acid fabric using a bioreactor;this was subsequently implanted into syngeneic wild-type *** The in vitro liver organoid tissues generated transplantable tissues in the condensed collagen fibril matrix and were obtained from the mouse through partial *** Liver organoid tissue was produced from expanded HPCs using an originally designed bioreactor *** tissue was comparable to liver lobules,and with fibroblasts embedded in the network collagen fibrils of this artificial tissue,it is useful for reconstructing the hepatic interstitial structure.

关键词： Liver Three-dimensional tissue culture Hepatic progenitor cells Angiogenesis Biomimetic extracellular matrix

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Response of Nitrogen Leaching to Nitrogen Deposition in Disturbed and Mature Forests of Southern China

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Pedosphere 2009年第1期19卷 111-120页

作者： FANG Yun-Ting M. yoh MO Jiang-Ming P. GUNDERSEN ZHOU Guo-Yi Dinghushan Forest Ecosystem Research Station South China Botanical Garden the Chinese Academy of Sciences Zhaoqing Guangdong 520670 （China） Tokyo University of Agriculture and Technology Tokyo 183-8509 （Japan） Forest ＆ Landscape Denmark Faculty of Life Sciences University of Copenhagen Hoersholm Kongevej 112970 （Denmark）

Current nitrogen (N) leaching losses and their responses to monthly N additions were investigated under a disturbed pine (Pinus massoniana) forest and a mature monsoon broadleaf forest in southern China. N leaching losses from both disturbed and mature forests were quite high (14.6 and 29.2 kg N ha-1 year-1, respectively), accounting for 57% and 80% of their corresponding atmospheric N inputs. N leaching losses were substantially increased following the first 1.5 years of N applications in both forests. The average increases induced by the addition of 50 and 100 kg N ha-1 year-1 were 36.5 and 24.9 kg N ha-1 year-1, respectively, in the mature forest, accounting for 73.0% and 24.9% of the annual amount of N added, and 14.2 and 16.8 kg N ha-1 year-1 in the disturbed forest, accounting for 28.4% and 16.8% of the added N. Great N leaching and a fast N leaching response to N additions in the mature forest might result from long-term N accumulation and high ambient N deposition load (greater than 30 kg N ha-1 year-1 over the past 15 years), whereas in the disturbed forest, it might result from the human disturbance and high ambient N deposition load. These results suggest that both disturbed and mature forests in the study region may be sensitive to increasing N deposition.

关键词： atmospheric N deposition N addition N leaching loss N saturation subtropical forests

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Coloring Characteristic of Lead Glass for X-Ray Irradiation

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New Journal of Glass and Ceramics 2015年第3期5卷 25-30页

作者： Michiharu Sekimoto yoh Katoh Medicine and Medical Sciences University of Tsukuba Tsukuba Japan School of Radiology Faculty of Health Sciences Tokyo Metropolitan University Hachiōji Japan

The lead glass used in an X-ray examination room is indispensable for watching a subject being tested or a situation of operation of an X-ray generator, but because it is some structure equipment of an X-ray examination room, it must obey legal restrictions. Although the standard for lead glass is determined by the International Electrotechnical Commission (IEC), there are few reports about the characteristics related to interaction with radiation. We performed a comparison of three lead glass products, which are principally used in world. As for three products, differences are not looked by physics and chemical characteristics features. Simply the difference was looked by the coloring characteristic for an interaction with radiation. Furthermore, we checked that temporal decolorization of coloring had two half-lives. The short half-life is about 28 hours and the long half-life is about 107 days.

关键词： Lead Glass Coloring Absorbance Half-Life

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ZnO Heteroepitaxy on Sapphire Using a Novel Buffer Layer of Titanium Oxide: Optoelectronic Behavior

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Crystal Structure Theory and Applications 2013年第2期2卷 100-105页

作者： Satoshi Yamauchi yoh Imai Department of Biomolecular Functional Engineering Ibaraki University Hitachi Japan Department of Electric and Electronic Engineering Ibaraki University Hitachi Japan

Optoelectronic property of ZnO epitaxial layer grown by plasma-assisted epitaxy at temperature as low as 340°C using Ti2O3 buffer layer on a-sapphire were studied by low temperature photoluminescence at 10 K comparing to the layers on c-sapphire and a-sapphire without the buffer layer. The near band-edge emission consisting of free-exciton emissions and neutral-donor bound exciton emissions was significantly dependent on the buffer thickness and dominated by the free-exciton emissions in the layer grown on the very thin buffer layer about 0.8 nm, whereas the intense emissions by neutral-donor bound excitons were observed in the ZnO layer on c-sapphire. The structural behavior indicated the donor was originated from the three-dimensional growth of ZnO layer and details of the optoelectronic feature suggested the residual donors were Al and interstitial-Zn.

关键词： ZnO Ti2O3 Plasma-Assisted Epitaxy Photoluminescence Free-Exciton Bound-Exciton

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Beitrag zur Kenntnis des marinen oberen Uuterdevons und unIefen MitteldeVons Südchinas

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地质学报 1938年第1期 67-73页

作者： S.S.yoh

Marine unterdevonische Ablagerungen Zentral-und Ostasiens sind seit1893 durch Tschernyschew;in Altai-Gebirge,Peetz;im Kusnetzk-Becken,Weber;und Muschketow;in Ferghana,und Frech;in Schalbock und

关键词： der dchinas Beitrag zur Kenntnis des marinen oberen Uuterdevons und unIefen MitteldeVons S

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