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Nagao, Tomokazu,Matsuzaki, Kazuki,Takahashi, Miho,Minamitani, Haruyuki Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
In this study, we investigated apoptotic cell death induced by photodynamic therapy using 5-aminolaevulinic acid (ALA-PDT) in human promyelocytic leukemia cells (HL-60). ALA-PDT induced apoptosis in HL-60 cells as confirmed by DNA agarose gel electrophoresis and nuclear staining with Hoechst 33342. The apoptotic cell death was inhibited by addition of broad-spectrum caspase inhibitor Z-Asp-CH$_2$-DCB, indicating that the apoptotic cell death was induced in a caspase-dependent manner. Actually, western blotting analysis revealed that caspase-3 was processed as early as 1.5 h after ALA-PDT. Cytoplasmic cytochrome c released from mitochondria was detected by western blotting. However, inhibitor of caspase-9, a cysteine protease located in the downstream of cytochrome c release, was not able to reduce the apoptotic cell death. Therefore, the mitochondrial apoptotic pathway was not involved in the ALA-PDT-induced apoptosis. On the other hand, it was found that ALA-PDT-induced apoptosis was clearly inhibited by pretreatment of caspase-8 inhibitor. These data suggest that caspase-8-mediated apoptotic pathway is important in ALA-PDT-induced cell death.
Nagao, K.,Osada, K.,Murai, A.,Okumura, J.,Kita, K. Asian Australasian Association of Animal Productio 2001 Animal Bioscience Vol.14 No.12
We have examined the influence of antisense oligo deoxynucleotide (ODN) of IGFBP-2 on tissue IGFBP-2 gene expression in chicks. Antisense IGFBP-2 ODN was directly injected into the liver or cerebroventricle. Control birds were injected with vehicle. The hepatic IGFBP-2 gene expression was decreased to approximately 30% of the control at 2 h after injection of antisense ODN. In the brain of chickens injected with antisense ODN, IGFBP-2 mRNA level did not change after 2 h of injection and decreased to approximately 60% of the control after 6 h of injection. These results showed that the expression of IGFBP-2 gene in the liver and brain was successfully suppressed by administrating antisense ODN and that hepatic IGFBP-2 gene expression was quickly suppressed by antisense ODN compared with the brain.
Nagao, K.,Takahara, Y.,Asai, H.,Hayashi, N.,Kitayama, T.,Yoshimura, Y.,Yokota, H.,Kita, Kazumi Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.8
The effect of dietary fatty acid supplementation on milk production, milk composition and plasma constituents in dairy cows was examined. Dietary fatty acids including mainly palmitic acid and stearic acid were given to cows from 2 weeks before and 8 weeks after parturition. Weekly gain of daily milk production was increased gradually during early lactation period and reached a plateau at 4 weeks after parturition. Weekly gain of daily milk production in lactating cows received dietary fatty acids was significantly higher than that of cows given a control diet alone. Although milk lactose concentration was slightly decreased by dietary fatty acid supplementation, milk fat and protein were not significantly influenced by dietary fatty acid supplementation. Dietary fatty acids did not affect plasma concentrations of triglyceride, non-esterified fatty acids, total cholesterol, high-density lipoprotein cholesterol and glucose during postpartum. It is suggested that dietary fatty acid supplementation has the potency to enhance energy balance and improve milk yield without any adverse effects on milk composition.
Nagao, K.,Haba, M. K.,Lee, J. I.,Kim, T.,Lee, M. J.,Park, C.,Jwa, Y. J.,Choi, B.-G. THE GEOCHEMICAL SOCIETY OF JAPAN 2016 Geochemical journal Vol.50 No.4
<P>The Jinju (H5) meteorite fell as four fragments in the Jinju area, Gyeonsangnam-do, South Korea, on March 9, 2014. The major element concentrations and noble gas isotopic compositions were determined for Jinju-1 and Jinju-2, stones of the first and second discoveries, respectively, by using X-ray fluorescence (XRF) analysis and noble gas mass spectrometry combined with total melting and stepwise heating noble gas extraction. The major element composition agrees well with that of equilibrated H chondrites. Very low contamination from terrestrial atmospheric noble gases was detected, which may be attributed to the rapid recovery of the stones within two days after the fall of the Jinju meteorite. A short cosmic ray exposure age of 2.4 My was obtained. The (U, Th)-He, and K-Ar ages are concordant at ca. 4.0 Gy, which suggests that no severe heating event occurred to cause a loss of He after the resetting at 4.0 Gy. Overabundances of trapped Ar and Kr, which were released at 800 degrees C, were found in addition to 'normal' Q gas of Ar, Kr and Xe at >= 1400 degrees C. The low-temperature component could be explained by Ar and Kr supplied by an adjacent impact region that were trapped when the minerals of the Jinju meteorite were formed during cooling. The heavy shock event that occurred at 4.0 Gy might have produced the observed numerous vugs and vapor growth crystals in this meteorite (Choi et al., 2015) and could have supplied the Ar and Kr to thermally weak minerals.</P>
Sharing Information for Event Analysis over the Wide Internet
Nagao, Masahiro,Koide, Kazuhide,Satoh, Akihiro,Keeni, Glenn Mansfield,Shiratori, Norio The Korea Institute of Information and Commucation 2010 Journal of communications and networks Vol.12 No.4
Cross-domain event information sharing is a topic of great interest in the area of event based network management. In this work we use data sets which represent actual attacks in the operational Internet. We analyze the data sets to understand the dynamics of the attacks and then go onto show the effectiveness of sharing incident related information to contain these attacks. We describe universal data acquisition system for event based management (UniDAS), a novel system for secure and automated cross-domain event information sharing. The system uses a generic, structured data format based on a standardized incident object description and exchange format (IODEF). IODEF is an XML-based extensible data format for security incident information exchange. We propose a simple and effective security model for IODEF and apply it to the secure and automated generic event information sharing system UniDAS. We present the system we have developed and evaluate its effectiveness.
Assessing the Development of English Learners’ Understanding of the Discussion Genre
Akiko Nagao 아시아테플 2019 The Journal of Asia TEFL Vol.16 No.3
This study used a genre-based approach within a systemic functional linguistics (SFL) framework to assess the development of English learners‘ understanding of the discussion genre. Fifty-two undergraduates participated in a semester-long course, divided into three groups by English proficiency level. They were administered surveys at the beginning and end of the semester to assess their choice of appropriate lexicogrammatical features. A structural move analysis of their pre- and post- discussion genre writing task was conducted, and the frequency of -ly adverbs was analysed. The results indicated that learners‘ understanding of discussion genre structure improved regardless of English proficiency. Depending on English proficiency, different features of lexicogrammatical functions, especially related to interpersonal meaning improved. The post- survey showed that higher-English-proficiency learners‘ use of auxiliary verbs such as should, will, and can dramatically improved.
A Novel Frame Synchronization for MIMO-OFDM Transmission System
Yuhei Nagao,Kenichi Kubo,Masayuki Kurosaki,Hiroshi Ochi 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
MIMO-OFDM system, such as IEEE802.11n wireless LAN and IEEE802.16e wireless MAN, employs cyclic shift diversity transmission in order to avoid unintended beam-forming. However, such system reduces the accuracy of frame synchronization due to large value of channel root mean square (RMS) delay spread, which is observed at receiver. This paper proposes a novel frame synchronization scheme for high accuracy in large RMS delay spread channel environment. The simulation results show that the proposed scheme can improve the performance of the packet error rate and synchronization error rate in IEEE802.11 TGn channel model B with the RMS delay spread of 15[㎱] and model E with RMS delay spread of 100[㎱].