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Detailed analysis of PCBs and PCDD/Fs impurities in a dielectric oil sample （ASKAREL Nr 1740） from an imported transformer in China

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Frontiers of Environmental Science & Engineering 2014年第2期8卷 195-204页

作者： Jun HUANG Yamei HUI toru matsumura Gang YU Shubo DENG Makoto YAMAUCHI Changmin WU Norimasa YAMAZAKI School of Environment POPs Research Center Tsinghua University Beijing 100084 China IDEA Consultants Inc. Shizuoka 421-0212 Japan CSD IDEA (Beijing) Institute of Environmental Innovation Co. Lt~ Beijing 100084 China

Homolog and congener profiles of polychlori- nated biphenyls （PCBs）, polychlorinated dibenzo-p- dioxins （PCDDs） and polychlorinated dibenzofurans （PCDFs） in commercial PCBs formulations are useful information for the source appointment of PCBs contam- ination as well as the risk assessment caused by potential exposure. Dielectric oil （ASKAREL Nr 1740） in an imported transformer found in China was sampled and analyzed by isotope dilution technology using high resolution gas chromatography-high resolution mass spectrometry （HRGC/HRMS）. The detailed homolog and congener profiles of PCBs obtained were compared with those of known Aroclor formulations. High similarity in the homolog profile between the oil sample and Aroclor 1260was found, with the hexachlorinated and hepta- chlorinated biphenyls accounting for more than 80.2% of the total PCBs concentration. Severn indicator PCBs contribute about 30%, while 12 PCB congeners （i.e., # 153, #143, #168, #180, #149, #165, #138, #170, #190, #187, #174, #181） account for more than 50% of the total PCB concentrations. Total concentration ofPCDDs, PCDFs and dioxin-like PCBs （DL-PCBs） was found to be 740 ng TEQ/g, of which 620 ng TEQ/g came from DL-PCBs. The contribution of PCDDs to the total TEQ was neglectable. The concentration of PCDFs homologs follows the order of OCDF 〉 HxCDFs 〉 HpCDFs 〉 PeCDFs 〉 TeCDFs, which is in consistence with the previous study on Aroclor 1260. Three DL-PCBs congeners （i.e., #118, #156, #157） accounted for 77% of the total concentration of DL-PCBs, also they contribute 72% in the TEQ caused by DL-PCBs.

关键词： profiles of polychlorinated biphenyls (PCBs),polychlorinated dibenzo-p-dioxins (PCDDs) polychlori-nated dibenzofurans (PCDFs) Askarel transformer insulat-ing fluid

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A Theoretical Study on Van Der Pauw Measurement Values of Inhomogeneous Compound Semiconductor Thin Films

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Journal of Modern Physics 2010年第5期1卷 340-347页

作者： toru matsumura Yuichi Sato 不详

The influence of intermixing heterogeneous regions that have different electrical properties from the base materials on van der Pauw measurement values was theoretically studied by computer simulation using the finite-element method. The measurement samples selected were thin films of inhomogeneous semiconductors. Calculated electrical properties, such as resistivity, carrier density, and mobility of the thin films, varied in predictable ways when heterogeneous regions were dispersed in wide ranges over the samples. On the other hand, the mobility of the thin films showed a different change when heterogeneous regions were locally concentrated in the measurement samples.

关键词： Semiconductor Hall Effect Van Der Pauw Method Inhomogeneous Semiconductor

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Ectopic hepatocellular carcinoma mimicking a retroperitoneal tumor:A case report

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World Journal of Gastroenterology 2020年第18期26卷 2268-2275页

作者： Yuki Adachi Hiromitsu Hayashi Toshihiko Yusa toru Takematsu Kazuki matsumura Takaaki Higashi Kensuke Yamamura Takanobu Yamao Katsunori Imai Yo-ichi Yamashita Hideo Baba Department of Gastroenterological Surgery Graduate School of Life SciencesKumamoto UniversityKumamoto 8608556Japan

BACKGROUND An ectopic hepatocellular carcinoma(EHCC)arises from the ectopic liver which is defined as a hepatic organ or tissue not connected to surrounding *** is a rare disease and it is difficult to diagnose ***,the clinical features are not fully *** SUMMARY A retroperitoneal tumor(6 cm)was located at the dorsal side of the pancreas head on abdominal ultrasonography in an 81-year old woman positive for hepatitis C virus *** enhanced-computed tomography and gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid-enhanced magnetic resonance imaging showed viable HCC patterns with early enhancement and delayed *** tumor markers-serum alphafetoprotein and alpha-fetoprotein-L3%-were increased to 30.1 ng/m L and83.1%,*** induced by vitamin K absence or antagonist-Ⅱwas within normal levels(17 m AU/m L).Positron emission tomography-computed tomography showed strong accumulation into the tumor(Standardized Uptake Value max:13.8),and the tumor cytology following endoscopic ultrasoundguided fine needle aspiration showed poorly differentiated *** extirpation was performed,and operative findings showed that the retroperitoneal tumor was disconnected from the pancreas and the *** lymph nodes near the tumor were histologically *** histological examination,the tumor was finally diagnosed as EHCC with Arginase-1 positive *** We report our experience of a rare EHCC which was difficult to diagnose,and we present a review of the literature.

关键词： Ectopic hepatocellular carcinoma Differential diagnosis Retroperitoneal tumor Case report

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Invasive group B streptococcal infection in a patient with post splenectomy for hypersplenism secondary to liver cirrhosis and portal hypertension

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World Journal of Emergency Medicine 2016年第1期7卷 68-70页

作者： Tomoya Okazaki toru Hifumi Arisa Manabe Hikari matsumura Satoshi Egawa Hideyuki Hamaya Nastuyo Shinohara Koshiro Takano Hajime Shishido Yuko Abe Kenya Kawakita Masanobu Hagiike Yasuhiro Kuroda Emergency Medical Center Kagawa University Hospital Kita Kagawa 761-0793 Japan

BACKGROUND:Splenectomy in patients with liver cirrhosis(LC)is expected to become more common owing to its efficacy on portal *** this report we describe an alarming case of group B streptococcus(GBS)infection after splenectomy in a patient with ***:A 72-year-old woman with a history of LC was admitted to our emergency department because of respiratory *** patient had received left lateral segmentectomy of the liver and splenectomy three months before *** examination revealed significant wheezing during inspiration and expiration,but no crackles and *** radiography and CT showed no infiltrates.A presumptive diagnosis of bronchial asthma caused by upper respiratory infection was *** days after admission,GBS infection was confirmed by blood culture and penicillin G was *** were given intravenously for a total of 12 ***:The patient was discharged on the 12th day after ***:Although efficacy of splenectomy in patients with LC has been reported,immune status should be evaluated for a longer *** who have undergone splenectomy are highly susceptible to bacteria;moreover,LC itself is an independent risk factor for mortality in patients with *** prophylaxis against GBS has not been established,immediate action should be *** physicians should be aware of invasive GBS infection in the context of the critical risk factors related to splenectomy and LC,particularly the expected increase of splenectomy performed in LC patients.

关键词： Group B streptococcal infection Splenectomy Liver cirrhosis

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Efficacy of computed image modification of capsule endoscopy in patients with obscure gastrointestinal bleeding

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World Journal of Gastrointestinal Endoscopy 2012年第9期4卷 421-428页

作者： Tomoaki matsumura Makoto Arai toru Sato Tomoo Nakagawa Daisuke Maruoka Masaru Tsuboi Sachio Hata Eiji Arai Tatsuro Katsuno Fumio Imazeki Osamu Yokosuka Department of Medicine and Clinical Oncology Graduate School of MedicineChiba UniversityChiba 2608670Japan

AIM:To investigate whether flexible spectral color enhancement(FICE) improves diagnostic yields of capsule endoscopy(CE) for obscure gastro-intestinal bleeding(OGIB).METHODS:The study subjects consisted of 81 *** FICE,there were three different sets with different *** randomly selected sets of FICE,images of CE were evaluated again by two individuals who were not shown the conventional CE reports and *** difference between FICE and conventional imaging was ***:The overall diagnostic yields in FICE sets 1,2,3 and conventional imaging(48.1%) were 51.9%,40.7%,51.9% and 48.1%,respectively,which showed no statistical difference compared to conventional *** total numbers of detected lesions per examination in FICE imaging and conventional imaging were 2.5 ± 2.1 and 1.8 ± 1.7,respectively,which showed a significant difference(P = 0.01).CONCLUSION:The diagnostic yield for OGIB is not improved by ***,FICE can detect significantly more small bowel lesions compared to conventional imaging.

关键词： Computed virtual chromoendoscopy Flexible spectral color enhancement Capsule endoscopy Obscure gastro-intestinal bleeding Diagnostic yield

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