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Kohji Yamaki,Herath Mudiyanselage Theja Herath,Yuko Takano-Ishikawa 한국식품영양과학회 2003 Journal of medicinal food Vol.6 No.4
Certain naturally occurring flavonoids affect immunoregulatory activities in vitroand in vivoagainst cytokineproduction. Since tumor necrosis factor (TNF)-a is one of the major inflammatory cytokines, the effects of various dietaryflavonoids on TNF-a production in lipopolysaccharide (LPS)-stimulated J774.1 cells were evaluated in vitro. Flavones,flavonols, and chalcone are the most potent inhibitors of production of TNF-a. Flavanone, naringenin, anthocyanidin, pelargo-din, and cyanidin exhibit moderate inhibitory activity. In contrast, genistein isoflavone displays weak inhibition, while eri-odictyol flavanone is inactive. It is clear that the double bond between carbons 2 and 3 and the ketone group at position 4 offlavonoids are necessary for potent inhibitory effect. The difference in inhibitory action appears to depend on the categorizedsubclass of flavonoids.
Dopant-dependence on Charge-orbital Order in Impurity Doped Layered Manganites
Yuki Yamaki,Yuichi Yamasaki,Hironori Nakao,Youichi Murakami,Yoshio Kaneko,Yoshinori Tokura 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
In this study we have investigated dopant effects on a typical charge-orbital ordered state ina single layered manganite La0.5Sr1.5MnO4 using magnetization measurement and resonant x-rayscattering technique. We have studied how the charge-orbital ordered state is affected by the 3%substitution of Cr, Fe and Ga ions for Mn ions. It is revealed that the impurity doping suppresses thelong-range charge-orbital order, in which the degree of suppression strongly depends on dopant ions,and eventually forms a phase-separated ground state between charge-orbital order and ferromagneticstates.
Iron-based Cathodes/anodes for Li-ion and Post Li-ion Batteries
Okada, Shigeto,Yamaki, Jun-ichi 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.7
Transition-metal oxides and chalcogenides with and 3-dimensional layered structures have been extensively investigated as cathodes for lithium secondary batteries. However, few studies have focused on intercalation host compounds containing the (XO_(m))^(n-) polyanions (e. g., X = Mo, W, S, P, and B) in place of the smaller O^(2-). Recently, raremetal-free materials and complexes with polyanions have been proposed as new candidates for the next generation cathodes/anodes. In this material group, the promising cathode/anode performances of NASICON-type Li₃Fe₂(PO₄)₃, olivine-type LiFePO₄, and calcite-tye FeBO₃ are presented. The aim of this study further the develo㎛ent of a multivalent-ion battery using Mg^(2+) or Ca^(2+) and an all polyanionic solid-state battery comprised of a polyanionic cathode, electrolyte, and anode.
A rice ABC transporter, OsABCC1, reduces arsenic accumulation in the grain
Song, Won-Yong,Yamaki, Tomohiro,Yamaji, Naoki,Ko, Donghwi,Jung, Ki-Hong,Fujii-Kashino, Miho,An, Gynheung,Martinoia, Enrico,Lee, Youngsook,Ma, Jian Feng National Academy of Sciences 2014 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.111 No.44
<P><B>Significance</B></P><P>Contamination of water and foods with arsenic (As) poses a threat to millions of people worldwide. Because the rice grain is the major source of As intake, reducing the transfer of As from soil to the grain is a pressing public health issue. We found that a member of the <I>Oryza sativa</I> C-type ATP-binding cassette transporter (OsABCC) family, OsABCC1, detoxifies As and reduces the amount of As in the rice grain. OsABCC1 in the upper nodes of rice plants restricts the distribution of As to the grain by sequestering it in the vacuoles of the phloem companion cells of diffuse vascular bundles directly connected to the grain. Our work suggests a strategy for limiting As accumulation in rice grains and thereby reducing human As exposure.</P><P>Arsenic (As) is a chronic poison that causes severe skin lesions and cancer. Rice (<I>Oryza sativa</I> L.) is a major dietary source of As; therefore, reducing As accumulation in the rice grain and thereby diminishing the amount of As that enters the food chain is of critical importance. Here, we report that a member of the <I>Oryza sativa</I> C-type ATP-binding cassette (ABC) transporter (OsABCC) family, OsABCC1, is involved in the detoxification and reduction of As in rice grains. We found that <I>OsABCC1</I> was expressed in many organs, including the roots, leaves, nodes, peduncle, and rachis. Expression was not affected when plants were exposed to low levels of As but was up-regulated in response to high levels of As. In both the basal nodes and upper nodes, which are connected to the panicle, OsABCC1 was localized to the phloem region of vascular bundles. Furthermore, OsABCC1 was localized to the tonoplast and conferred phytochelatin-dependent As resistance in yeast. Knockout of <I>OsABCC1</I> in rice resulted in decreased tolerance to As, but did not affect cadmium toxicity. At the reproductive growth stage, the As content was higher in the nodes and in other tissues of wild-type rice than in those of <I>OsABCC1</I> knockout mutants, but was significantly lower in the grain. Taken together, our results indicate that OsABCC1 limits As transport to the grains by sequestering As in the vacuoles of the phloem companion cells of the nodes in rice.</P>
Orden, E.A.,Yamaki, K.,Ichinohe, T.,Fujihara, T. Asian Australasian Association of Animal Productio 2000 Animal Bioscience Vol.13 No.4
In vivo digestibility, nitrogen retention and microbial protein yield from diets of 100% ammonia treated rice straw (ARS) ($D_1$); 65% untreated rice straw (URS)+30% rice bran (RB)+5% SBM ($D_2$) and 85% ARS+15% RB ($D_3$) were determined using three Japanese Corriedale wethers in a $3{\times}3$ Latin Square Design. Results showed that DM consumption and organic matter digestibility were highest in $D_3$; but did not promote high protein digestibility, which RB+SBM had effected in URS based-diet. Dry matter intake and OM digestibility were the same for $D_1$ and $D_3$. Solubility of fiber bonds was increased by ammoniation, resulting in higher NDF digestibility. Nitrogen retention and microbial protein yield of rice bran supplemented groups was higher than ARS, but supplementation did not significantly increase efficiency of microbial protein synthesis from ARS which did occur when RB+SBM was added to untreated straw. The quality of ammoniated rice straw could be improved through RB supplementation because of its positive effects on DM digestibility, nitrogen retention and microbial protein yield. However, the addition of RB+SBM to URS resulted to more efficient N utilization.