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Katsumata, M.,Kaji, Y.,Takada, R.,Dauncey, M.J. Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.8
We conducted a series of investigations in order to elucidate role of nutritional status in regulating GLUT expression and energy metabolism in porcine muscle. Firstly, the role of mild undernutrition in regulating muscle GLUT gene expression and function was studied in growing pigs (3 wk of age) on a high (H) or low (L) food intake (H = 2L) at $35^{\circ}C$ or $26^{\circ}C$. Low food intake selectively upregulates GLUT1 and GLUT4 gene expression; mRNA levels were elevated in longissimus dorsi (L. dorsi) and rhomboideus muscles but not in diaphragm or cardiac muscles. Our next step was to determine whether dietary lysine, a major primary limiting amino acid in diets for pigs, affects muscle GLUT4 expression. Pigs of 6 wk of age were pair-fed a control or low lysine (LL) diet. The control diet contained optimal amounts of all essential amino acids, including 1.15% lysine. The LL diet was similar but contained only 0.70% lysine. GLUT4 mRNA expression was upregulated by the LL diet in L. dorsi and rhomboideus muscles, whereas that in cardiac muscle was unaffected. GLUT4 protein abundance was also higher in rhomboideus muscle of animals on the LL diet. We conducted another investigation in order to elucidate effects of the LL diet on post-GLUT4 glucose metabolism. Activity of hexokinase was unaffected by dietary lysine levels while that of citrate synthase was higher both in L. dorsi and rhomboideus muscles of pigs fed on the LL diet. Glucose 6-phosphate content was higher in L. dorsi msucle in the LL group. Glycogen content was higher both in L. dorsi and rhomboideus muscles in the LL group. Further, we determined the effects of dietary lysine levels on accumulation of intramuscular fat (IMF) in L. dorsi muscle of finishing pigs. A low lysine diet (lysine content was 0.40%) meeting approximately 70% of the requirement of lysine was given to finishing pigs for two months. IMF contents in L. dorsi of the pigs given the low lysine diet were twice higher than those of the pigs fed on a control diet (lysine content was 0.65%). Finally, we proved that a well known effect of breadcrumbs feeding to enhance IMF of finishing pigs could be attributed to shortage of amino acids in diets including breadcrumbs.
Recent Progress in Sensor Materials for Fluorescence Thermometry
Toru Katsumata 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Various materials, such as spinel (MgAl2O4), garnet (Y3Al5O12), sapphire (Al2O3), YAlO3 and long afterglow phosphors (CaAl2O4, SrAl2O4) crystals and composites of these materials are developed for a highly sensitive thermo-sensor in fluorescence thermometer application. Temperature dependences of photoluminescence (PL) lifetime and/or PL intensity from sensor materials are evaluated using crystals grown by floating zone technique. PL lifetime from sensor materials becomes faster with temperature. PL intensity from sensor materials decreases linearly with temperature. From the temperature dependences of PL, temperature can be measured using these materials as the fluorescence thermo-sensors.
( Ryo Katsumata ),( Manabu Ishii ),( Suni Lee ),( Yukiko Handa ),( Takahisa Murao ),( Minoru Fujita ),( Hiroshi Matsumoto ),( Takemi Otsuki ),( Akiko Shiotani ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2018 Journal of Neurogastroenterology and Motility (JNM Vol.24 No.3
Background/Aims Food interaction, including food hypersensitivity, plays a key role in the pathogenesis of irritable bowel syndrome with diarrhea (IBS-D). Since only a few studies have been reported about the relationship between food hypersensitivity and IBS-D, we elucidate the prevalence of serological food hypersensitivity in patients with IBS-D and the characteristics of gastrointestinal symptoms and serum cytokine profiles in patients with IBS-D and serological food hypersensitivity. Methods Immunoglobulin E (Ig E)-mediated serological food hypersensitivity and serum cytokine levels were evaluated using the multiple allergen simultaneous test evaluating food allergen-specific serum IgE and Luminex Milliplex Panel containing multiple fluorescencelabeled beads. Class 2 or above was considered as IgE-mediated food hypersensitivity positive. The gastrointestinal symptom rating scale was used to evaluate symptoms. Results We enrolled 92 subjects, including 60 with IBS-D and 32 healthy controls. The percentages of patients with IgE-mediated serological food hypersensitivity were not significantly different between the groups (controls = 28.1% and IBS-D = 33.3%). Serum IL-1β, IL- 6, IL-8, macrophage inflammatory protein-1alpha, and TNF-α levels were higher in patients with IBS-D than in controls. Serum concentration of TNF-α (43.4 vs 21.8 pg/mL, P = 0.009) was higher in patients with IBS-D without IgE-mediated serological food hypersensitivity than those with food hypersensitivity. Conclusions One-third of Japanese patients with IBS-D showed IgE-mediated serological food hypersensitivity. The serum cytokine profile differed and was characterized by lower inflammatory cytokine levels in IBS-D with IgE-mediated serological food hypersensitivity. Serological test regarding IgE-mediated food hypersensitivity can detect a certain cluster of IBS-D. (J Neurogastroenterol Motil 2018;24:415-421)
ASEAN and the BRI: The Utility of Equidistant Diplomacy with China and the US
( Hiro Katsumata ),( Shingo Nagata ) 서울대학교 통일평화연구원 2019 Asian Journal of Peacebuilding Vol.7 No.2
The aim of the present study is to shed light on the diplomatic achievements of the Association of Southeast Asian Nations (ASEAN), by exploring the way in which it has dealt with the Belt and Road Initiative (BRI) implemented by China. ASEAN is little more than an association of minor powers with insignificant military and economic capabilities. However, in its dealings with the BRI, it has proactively advanced its own interests by skillfully conducting equidistant diplomacy with China and the US, without becoming too remote from or too close to either one of them, thereby reaping benefits from its favorable relations with each of them.
Development of sensor materials for fluorescence thermometer application using LED excitation
Toru Katsumata,Hiroaki Aizawa,Shuji Komuro 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Phosphor materials, such as Cr doped spinel (MgAl2O4), garnet (Y3Al5O12) and sapphire (Al2O3) crystals and composites of these materials are developed for a highly sensitive thermo-sensor in fluorescence thermometer excited using LED. Temperature dependences of photoluminescence (PL) intensity from these materials are evaluated using LED excitation. PL intensity from sensor materials decreases linearly with temperature. Impurities doped sapphire, spinel, garnet crystals and their composites are found to be suitable materials as sensor materials for fluorescence thermometer using LED excitation. Yellow colored LED is found to be useful excitation light for Cr doped sensor materials. All the materials examined in this paper can be effectively excited using a yellow colored LED.
Fluorescence Thermometer Based on Photoluminescence Imaging of Ti Doped Sapphire
Toru Katsumata,Takashi Honda,Megumi Watabiki,Hiroaki Aizawa,Koichi Otsubo,Shuji Komuro 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Photoluminescence (PL) images from Ti doped sapphire (Ti doped Al2O3) crystals are observed for 2-dimensional fluorescence thermometer applications. Red colored bright PL images can be observed clearly from Ti doped sapphire sensor using a CCD camera under blue LED illumination. Intensity of red signal of the PL image decreases linearly with temperature of the sensor. Ti doped sapphire sensor is found to be useful for fluorescence temperature measurement using PL imaging technique.