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Search Results: 1 - 10 of 979 matches for " Hajime Oishi "
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Comparison of Pine Needles and Mosses as Bio-Indicators for Polycyclic Aromatic Hydrocarbons  [PDF]
Yoshitaka Oishi
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.48A1013

Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous environmental contaminants known to be hazardous to human health. Pine needles and mosses are useful bio-indicators for assessing PAH pollutions; however, the differences in their PAH uptake mechanisms have not been sufficiently discussed. In this study, the properties of pine needles and mosses as bio-indicators of PAHs were investigated on the basis of differences in their PAH profiles. Five sets each of pine needle and moss samples were collected from circular sampling plots and analyzed for 16 PAHs. A comparison of PAH profiles revealed that the proportion of lower molecular weight PAHs (2 - 3 aromatic rings; LMW PAHs) was significantly higher in pine needles (78.5% ± 4.8%) than in mosses (35.4% ± 6.8%). In contrast, the proportion of higher molecular weight PAHs (5 - 6 aromatic rings; HMW PAHs) was lower in pine needles (4.3% ± 2.9%) than in mosses (25.1% ± 3.3%). Further, the combination of PAH isomer ratios showed that PAH sources between pine needles and mosses were not the same. These differences were explained by their uptake mechanisms and partly by the absorption of PAHs from soil particles by mosses. These findings indicate that pine needles are useful for assessing airborne LMW PAH pollution, whereas mosses can be integrated indicators for assessing complex HMW PAH pollution of the atmospheric and soil environments. On the basis of these properties, the usefulness of these bio-indicators should also be evaluated according to the objective of the assessment and the areas where they are applied.

Endothelial Cell Proliferation in Swine Experimental Aneurysm after Coil Embolization
Yumiko Mitome-Mishima, Munetaka Yamamoto, Kenji Yatomi, Senshu Nonaka, Nobukazu Miyamoto, Takao Urabe, Hajime Arai, Hidenori Oishi
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0089047
Abstract: After coil embolization, recanalization in cerebral aneurysms adversely influences long-term prognosis. Proliferation of endothelial cells on the coil surface may reduce the incidence of recanalization and further improve outcomes after coil embolization. We aimed to map the expression of proliferating tissue over the aneurysmal orifice and define the temporal profile of tissue growth in a swine experimental aneurysm model. We compared the outcomes after spontaneous thrombosis with those of coil embolization using histological and morphological techniques. In aneurysms that we not coiled, spontaneous thrombosis was observed, and weak, easily detachable proliferating tissue was evident in the aneurysmal neck. In contrast, in the coil embolization group, histological analysis showed endothelial-like cells lining the aneurysmal opening. Moreover, immunohistochemical and morphological analysis suggested that these cells were immature endothelial cells. Our results indicated the existence of endothelial cell proliferation 1 week after coil embolization and showed immature endothelial cells in septal tissue between the systemic circulation and the aneurysm. These findings suggest that endothelial cells are lead to and proliferate in the former aneurysmal orifice. This is the first examination to evaluate the temporal change of proliferating tissue in a swine experimental aneurysm model.
Two cases of juvenile hypertrophic cardiomyopathy presenting with marked bi-atrial enlargement on standard 12-lead electrocardiogram  [PDF]
Hajime Kataoka
Open Journal of Internal Medicine (OJIM) , 2012, DOI: 10.4236/ojim.2012.21007
Abstract: This report describes two cases of juvenile hypertrophic cardiomyopathy (HCM) in which prominent bi-atrial enlargement was observed on standard 12-lead electrocardiogram, suggesting inherent predis-position to extreme enlargement and/or hypertrophy may exist in atrial myocardium in juvenile HCM. Comparative study between juvenile and adult HCM patients using a large sample size is required to confirm this hypothesis.
Characterization of Norwalk virus GI specific monoclonal antibodies generated against Escherichia coli expressed capsid protein and the reactivity of two broadly reactive monoclonal antibodies generated against GII capsid towards GI recombinant fragments
Tomoko Yoda, Yoshitake Terano, Yasuhiko Suzuki, Kenji Yamazaki, Isao Oishi, Tsuyoshi Kuzuguchi, Hiroyoshi Kawamoto, Etsuko Utagawa, Koichi Takino, Hajime Oda, Tadayoshi Shibata
BMC Microbiology , 2001, DOI: 10.1186/1471-2180-1-24
Abstract: In the present study, we used the recombinant capsid protein of genogroup I and characterized the obtained 17 monoclonal antibodies by using 19 overlapping fragments. Sixteen monoclonal antibodies recognized sequential epitopes on three antigenic regions, and the only exceptional monoclonal antibody recognized a conformational epitope. As for the two broadly reactive monoclonal antibodies generated against genogroup II, we indicated that they recognized fragment 2 of genogroup I. Furthermore, genogroup I antigen from a patient's stool was detected by sandwich enzyme-linked immunosorbent assay using genogroup I specific monoclonal antibody and biotinated broadly reactive monoclonal antibody.The reactivity analysis of above monoclonal antibodies suggests that the N-terminal domain may contain more antigenic epitopes than the C-terminal domain as suggested in our previous study. The detection of genogroup I antigen from a patient's stool by our system suggested that the monoclonal antibodies generated against E. coli expressed capsid protein can be used to detect genogroup I antigens in clinical material.Norwalk viruses (NVs) are a small positive-stranded RNA virus within the family Caliciviridae and consist of genogroups I and II (GI and GII). An enzyme-linked immunosorbent assay (ELISA) system to detect all types of NVs has not yet been established due to various clusters of NVs in two genogroups. The lack of an in vitro culture system might have hindered establishing a good detection system.The genome of NV is approximately 7.6 kb in size, and consists of three open reading frames (ORFs). The first ORF encodes non-structural proteins, a capsid protein is encoded by ORF2 and a function of the protein encoded by ORF3 has been unknown [1,2]. However, recently it was suggested that the ORF3 protein is a minor structural protein of the virion [3].Among the expression of cDNAs that encode NV capsid proteins, the baculovirus recombinant system is most common. Since all exp
Relationship between Nonverbal Behavior of Consultants and Consultees: A Preliminary Study  [PDF]
Kouji Oishi
Psychology (PSYCH) , 2017, DOI: 10.4236/psych.2017.86053
Abstract: Little is known about the relationship between the nonverbal behavior of consultants and consultees in problem identification interviews in behavioral consultations. In particular, despite its assumed importance to consultative relationships and consultation success, the effects of nonverbal behavior on behavioral consultations remains unexplored. This short case report describes a study which sought to determine how nonverbal behavior from consultants can control the behavior of consultees. We recorded the occurrence or nonoccurrence of gestures and nodding responses and examined the association between these nonverbal behaviors in consultants and consultees by lag sequential analysis of videotaped sessions. The consultations involved two consultants and one consultee. The consultee presented the cases of two clients with distinct clinical problems and discussed solutions in two consultation sessions with each consultant, for a total of four consultation sessions. Our findings suggest that the experiential differences of consultants influenced the use and effect of nonverbal behaviors in behavioral consultations. Lag sequential analysis further showed that a consultant’s nonverbal behavior, such as hand gestures, controlled that of the consultee. However, the promotional impact of nodding responses by the consultee in response to the experienced consultant was not observed in response to the less experienced consultant. Although our findings were derived from a single consultation series involving only four consultation sessions, they highlight the importance of nonverbal behavior for behavioral consultation success and suggest that consultant education and training programs for nonverbal behavior be continually updated with new knowledge to improve consultation success.
Effect of Silver-Loaded Zeolite on the Susceptibility of Escherichia Coli Against Antibiotics  [PDF]
Yoshihiro Inoue, Hajime Hamashima
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2012, DOI: 10.4236/jbnb.2012.31015
Abstract: We investigated the effect of silver-loaded zeolite (Ag-Z) on antibacterial activity of some antibiotics against Es-cherichia coli against antibiotics. We treated the bacterial suspension of E. coli by Ag-Z to be the level which the decrease of viable cell count was not observed. Susceptibility test of E. coli treated with Ag-Z was carried out against four antibiotics with different mode of action. Apparent increase in susceptibility was found in the case of rifampicin, not in others. The result suggests that application of Ag-Z to ward environment might give a good outcome at the treatment with rifampicin and at the treatment for pathogenic microbe spread through the air, such as tubercle bacilli.
Electrochemical Analysis of the Redox State of Silver Contained in Antibacterial Material  [PDF]
Yoshihiro Inoue, Hajime Hamashima
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2012, DOI: 10.4236/jbnb.2012.32019
Abstract: Introduction of silver into some inorganic material causes the resulting mixture to have antibacterial activity. Here, we investigated the role of silver in the bactericidal activity of silver-loaded zeolite, by measuring the effects of silver-loaded zeolite on Escherichia coli cell viability under conditions in which the oxidation state of the silver was controlled electrochemically. Bactericidal activity was observed when the sweeping voltage between 0 and 0.7 V was applied to the silver electrode. When nitrogen gas bubbling or reactive oxygen scavengers were added to the experimental system, bactericidal activity decreased. These results indicated that the redox cycle, Ag0 <—> Ag+, caused the dissolved oxygen to form reactive oxygen species.
Scientific Catch-Up in Asian Economies: A Case Study for Solar Cell  [PDF]
Ichiro Sakata, Hajime Sasaki
Natural Resources (NR) , 2013, DOI: 10.4236/nr.2013.41A017

A significant structural change in the pattern of economic development in Asian economies has been observed in recent years. We have seen many cases in which the Asian economies became the center of the world-wide production in an extremely short period of time after a new product entered the market. Also in the science, the number of papers written by Asian researchers has been increasing dramatically. In this situation, the existing studies cannot sufficiently explain the driving force and the mechanism of catch-up or economic growth. Therefore, it is now required to model this new type of economic development. In this paper we analyzed their scientific catch-up status using scientific papers on solar cells to clarify the structural change. After mid 1990s, knowledge creation has been accelerated in the field of solar cell. Now more than three thousand papers are published annually. We found as a result that the catch-up process in Asian economies had progressed rapidly, that some economies had a larger share of scientific papers in the frontier field of advanced science than in the matured fields, and that the strategy largely changed from area to area. A parallel-running-type growth model has thus been emerging in Asia. Responding to the significant changes in development model, we have to re-design the framework of economic cooperation. There is a need for further horizontal collaboration among major Asian economies and developed

Regression Analysis of Electric Power Market Price of JEPX  [PDF]
Hajime Miyauchi, Tetsuya Misawa
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.24065
Abstract: The deregulation of electric power industries is introducing around the world and electric power markets are operated under the deregulation. Also in Japan, JEPX (Japan Electric Power Exchange) operates a day-ahead market since April 2005. We have already analyzed the electric power market prices in the several markets including JEPX by autoregressive models. We compose simple regression equations, of which a dependent variable is the market price and explanatory variables are the demand and the market price of 24 hours ago. In this paper, we analyze JEPX price data in summer seasons from 2007 to 2013. In this period, the JEPX price is affected by many social phenomena such as Lehman Shock and East Japan earthquake disasters. We compare the determination coefficient and the coefficients of regression and investigate the change of coefficients over the years.
Effects of Microstructural Modification Using Friction Stir Processing on Fatigue Strength of Butt-Welded Joints for High-Strength Steels  [PDF]
Hajime Yamamoto, Kazuhiro Ito
Materials Sciences and Applications (MSA) , 2018, DOI: 10.4236/msa.2018.97045
Abstract: Friction stir processing (FSP) is an effective surface-microstructure modification technique using a rotational tool to refine and homogenize microstructure of metallic materials. In this study, FSP was conducted on the surface of the heat-affected zone (HAZ), which is a region exhibiting degraded mechanical properties and shown to have microstructural changes, of butt-welded joints for two high-strength steels with tensile strength grades of 490 MPa and 780 MPa (hereafter HT490 and HT780, respectively). Inhomogeneous mixing of materials derived from weld metals and base metals (BMs) in a stir zone (SZ) produced inhomogeneous distribution of elements and microstructure depending on the set of the advancing side and retreating side in the SZs. The welded joints with FSP for HT490 exhibited higher hardness than that of the BM through whole of the SZ surface (fine polygonal ferrite grains and bainite structure with laths at the Mn-rich and Mn-poor regions, respectively). On the other hand, those for HT780 exhibited the minimum hardness value similar to that of the BM at the SZ surface (a few polygonal ferrite grains in the matrix of martensite laths). Fatigue strength increased by about 35 MPa and 15 MPa in stress amplitude at 107 cycles as fatigue limit due to FSP. Fatigue failure occurred at the BM and the SZ, respectively, in the welded joints modified by FSP for HT490 and HT780, in comparison with the HAZs in the as-welded joints for both grade steels. The difference in fatigue strength increase due to FSP and failure location between the welded joints for HT490 and HT780 can be attributed to the topmost SZ microstructures and their distribution.
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