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Kazutomo Yamasaki,Takashi Hisabe,Kenshi Yao,Hiroshi Ishihara,Kentaro Imamura,Tatsuhisa Yasaka,Hiroshi Tanabe,Akinori Iwashita,Toshiharu Ueki 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.4
Background/Aims: A white substance that is opaque to endoscopic light is sometimes observed in the epithelium during narrowbandimaging with magnifying endoscopy of gastric or colorectal epithelial neoplasms. This prospective observational study aimedto determine whether the morphology of the white opaque substance (WOS) allows differential diagnosis between colorectaladenoma and carcinoma. Methods: A consecutive series of patients with colorectal adenomas or early carcinomas who underwent endoscopic resectionor surgical excision were studied. The morphology of the WOS was determined based on endoscopic images before thehistopathological diagnosis was performed. The primary outcome was the diagnostic performance of an irregular WOS as a markerof colorectal carcinoma. Results: The study analyzed 125 lesions. A total of 33 lesions showed an irregular WOS, and 92 lesions showed a regular WOS. Among the 33 lesions found to show an irregular WOS, 30 were carcinomas. Among the 92 lesions showing a regular WOS, 79 wereadenomas. With irregular WOS as a marker of carcinoma, the diagnostic accuracy was 87%, sensitivity was 91%, and specificity was86%. Conclusions: This study demonstrated the potential usefulness of the morphology of the WOS as a marker for the differentialdiagnosis between adenoma and carcinoma in cases of colorectal epithelial neoplasms.
Kojima Tsukasa,Yamasaki Yuzo,Kamitani Takeshi,Yabuuchi Hidetake,Shirasaka Takashi,Shimomiya Yamato,Kondo Masatoshi,Hamasaki Hiroshi,Kato Toyoyuki,Nagao Michinobu,Honda Hiroshi 아시아심장혈관영상의학회 2019 Cardiovascular Imaging Asia Vol.3 No.1
Objective: The smallest diagnostically sufficient amount of contrast media (CM) should be used for coronary computed tomography angiography (CCTA) to minimize the risk of contrast- induced nephrotoxicity in elderly patients with coronary artery disease. The purpose of this study was to propose dynamic-CCTA using a low dose of CM and temporal maximum intensity projection (TMIP) and to investigate its image quality compared to standard-CCTA. Materials and Methods: Participants comprised 30 patients with coronary artery disease who underwent dynamic-CCTA and standard-CCTA using 320-row CT. Dynamic-CCTA was continuously performed at mid-diastole throughout 15–25 cardiac cycles after bolus injection of CM [103 mg iodine/kg body weight (mgI/kg)]. TMIP-CCTA was reconstructed from three-phase dynamic-CCTA data, including a phase with peak enhancement of the ascending aorta. Standard-CCTA was performed using a standard CM dose (259 mgI/kg). Image quality of both TMIP-CCTA and standard-CCTA was analyzed. Results: The amount of CM used in TMIP-CCTA and standard-CCTA was 16.2±2.6 mL and 40.1±7.3 mL, respectively. The mean effective radiation dose was not significantly different between the two methods. Mean coronary attenuation was significantly lower for TMIP-CCTA than standard-CCTA [346.9±82.8 Hounsfield units (HU) vs. 455.4±75.3 HU, p<0.05]. Image noise was significantly lower for TMIP-CCTA than standard-CCTA (20.0±3.2 HU vs. 28.1± 3.6 HU, p<0.05). There were no differences in signal-to-noise ratio and visual assessment scores between the two methods. Conclusion: TMIP-CCTA can be performed using more than 50% less CM with the same image quality as standard-CCTA.
Penchom Janwan,Pewpan M. Intapan,Hiroshi Yamasaki,Porntip Laummaunwai,Kittisak Sawanyawisuth,Chaisiri Wongkham,Chatchai Tayapiwatana,Amnat Kitkhuandee,Viraphong Lulitanond,Yukifumi Nawa,Wanchai Maleew 대한기생충학열대의학회 2013 The Korean Journal of Parasitology Vol.51 No.6
Neurognathostomiasis is a severe form of human gnathostomiasis which can lead to disease and death. Diagnosis of neurognathostomiasis is made presumptively by using clinical manifestations. Immunoblotting, which recognizes antigenic components of molecular mass 21 kDa and 24 kDa in larval extracts of Gnathostoma spinigerum (Gs 21/24), has high sensitivity and specificity for diagnosis of neurognathostomiasis. However, only very small amounts of the Gs 21/24 antigens can be prepared from parasites harvested from natural or experimental animals. To overcome this problem, we recently produced a recombinant matrix metalloproteinase (rMMP) protein from G. spinigerum. In this study, we evaluated this rMMP alongside the Gs 21/24 antigens for serodiagnosis of human neurognathostomiasis. We studied sera from 40 patients from Srinagarind Hospital, Khon Kaen University, Thailand, with clinical criteria consistent with those of neurognathostomiasis, and sera from 30 healthy control adults from Thailand. All sera were tested for specific IgG antibodies against both G. spinigerum crude larval extract and rMMP protein using immunoblot analysis. The sensitivity and specificity for both antigenic preparations were all 100%. These results show that G. spinigerum rMMP protein can be used as an alternative diagnostic antigen, in place of larval extract, for serodiagnosis of neurognathostomiasis.
Fundamental Study on Electrostatic Atomization of Biofuel/Water Emulsion
( Chien-hua Fu ),( Osamu Imamura ),( Kazuhiro Akihama ),( Hiroshi Yamasaki ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
This paper reports the experimental investigation of electrostatic atomization of BDF/water emulsion. Biofuel, such as Bio Diesel Fuel (BDF), is expected as the alternate fuel because of its carbon-neutral characteristics. In the process of making the biofuels, biofuels include water and the separation energy cost is relatively high. From this viewpoint, it is expected that the water in the biofuel is utilized in a positive manner. Biofuel and water mixture usually have large electric conductivity in comparison with hydrocarbons and it is possible to control of atomization using the electrostatic energy. In addition, if the droplets and spray are charged, the spray shape and flame pattern could be controlled to enhance the combustion and to reduce the heat loss to the wall. From this background, the paper mainly is focused on the electrostatic atomization of the BDF/water mixture. For the comparison, n-hexadecane is used as a reference fuel. The mixture fraction of water is the parameter of the fuel. To keep the stable mixture, surface active agent was added in the tested fuels. The viscosity of some tested fuel was high and the characteristics of non-Newtonian viscosity were researched prior to atomization experiments. The thin capillary to inject the fuel and wire netting over the capillary are used as electrodes and direct current voltages are applied to the electrodes. The fuel is pushed by the pressurized nitrogen and injected to the air through the capillary. As the results, fraction of water affects the onset of mode change, such as dripping, spindle, cone-jet etc. Droplets diameters and droplets velocity were measured from the video images and the electric charge distribution was discussed to understand the electrostatic atomization.
Yohei Bamba,Masahiro Nonaka,Natsu Sasaki,Tomoko Shofuda,Daisuke Kanematsu,Hiroshi Suemizu,Yuichiro Higuchi,Ritsuko K. Pooh,Yonehiro Kanemura,Hideyuki Okano,Mami Yamasaki 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.6
Study Design: We established induced pluripotent stem cells (iPSCs) and neural stem/progenitor cells (NSPCs) from three newborns with spina bifida aperta (SBa) using clinically practical methods. Purpose: We aimed to develop stem cell lines derived from newborns with SBa for future therapeutic use. Overview of Literature: SBa is a common congenital spinal cord abnormality that causes defects in neurological and urological functions. Stem cell transplantation therapies are predicted to provide beneficial effects for patients with SBa. However, the availability of appropriate cell sources is inadequate for clinical use because of their limited accessibility and expandability, as well as ethical issues. Methods: Fibroblast cultures were established from small fragments of skin obtained from newborns with SBa during SBa repair surgery. The cultured cells were transfected with episomal plasmid vectors encoding reprogramming factors necessary for generating iPSCs. These cells were then differentiated into NSPCs by chemical compound treatment, and NSPCs were expanded using neurosphere technology. Results: We successfully generated iPSC lines from the neonatal dermal fibroblasts of three newborns with SBa. We confirmed that these lines exhibited the characteristics of human pluripotent stem cells. We successfully generated NSPCs from all SBa newbornderived iPSCs with a combination of neural induction and neurosphere technology. Conclusions: We successfully generated iPSCs and iPSC-NSPCs from surgical samples obtained from newborns with SBa with the goal of future clinical use in patients with SBa.