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Himeno, Seiichiro,Sumi, Daigo,Fujishiro, Hitomi Korean Society of ToxicologyKorea Environmental Mu 2019 Toxicological Research Vol.35 No.4
The transport systems for metals play crucial roles in both the physiological functions of essential metals and the toxic effects of hazardous metals in mammals and plants. In mammalian cells, Zn transporters such as ZIP8 and ZIP14 have been found to function as the transporters for Mn(II) and Cd(II), contributing to the maintenance of Mn homeostasis and metallothionein-independent transports of Cd, respectively. In rice, the Mn transporter OsNramp5 expressed in the root is used for the uptake of Cd from the soil. Japan began to cultivate OsNramp5 mutant rice, which was found to accumulate little Cd, to prevent Cd accumulation. Inorganic trivalent arsenic (As(III)) is absorbed into mammalian cells via aquaglyceroporin, a water and glycerol channel. The ortholog of aquaporin in rice, OsLsi1, was found to be an Si transporter expressed in rice root, and is responsible for the absorption of soil As(III) into the root. Since rice is a hyperaccumulator of Si, higher amounts of As(III) are incorporated into rice compared to other plants. Thus, the transporters of essential metals are also utilized to incorporate toxic metals in both mammals and plants, and understanding the mechanisms of metal transports is important for the development of mitigation strategies against food contamination.
NEW FAMILIES OF HYPERBOLIC TWISTED TORUS KNOTS WITH GENERALIZED TORSION
Keisuke, Himeno,Masakazu, Teragaito Korean Mathematical Society 2023 대한수학회보 Vol.60 No.1
A generalized torsion element is an obstruction for a group to admit a bi-ordering. Only a few classes of hyperbolic knots are known to admit such an element in their knot groups. Among twisted torus knots, the known ones have their extra twists on two adjacent strands of torus knots. In this paper, we give several new families of hyperbolic twisted torus knots whose knot groups have generalized torsion. They have extra twists on arbitrarily large numbers of adjacent strands of torus knots.
Seiichiro Himeno,Daigo Sumi,Hitomi Fujishiro 한국독성학회 2019 Toxicological Research Vol.35 No.4
The transport systems for metals play crucial roles in both the physiological functions of essential metals and the toxic effects of hazardous metals in mammals and plants. In mammalian cells, Zn transporters such as ZIP8 and ZIP14 have been found to function as the transporters for Mn(II) and Cd(II), contributing to the maintenance of Mn homeostasis and metallothionein-independent transports of Cd, respectively. In rice, the Mn transporter OsNramp5 expressed in the root is used for the uptake of Cd from the soil. Japan began to cultivate OsNramp5 mutant rice, which was found to accumulate little Cd, to prevent Cd accumulation. Inorganic trivalent arsenic (As(III)) is absorbed into mammalian cells via aquaglyceroporin, a water and glycerol channel. The ortholog of aquaporin in rice, OsLsi1, was found to be an Si transporter expressed in rice root, and is responsible for the absorption of soil As(III) into the root. Since rice is a hyperaccumulator of Si, higher amounts of As(III) are incorporated into rice compared to other plants. Thus, the transporters of essential metals are also utilized to incorporate toxic metals in both mammals and plants, and understanding the mechanisms of metal transports is important for the development of mitigation strategies against food contamination.
Mechanisms underlying the volume regulation of interstitial fluid by capillaries: a simulation study
Yukiko Himeno,Masayuki Ikebuchi,Akitoshi Maeda,Akinori Noma,Akira Amano 한국한의학연구원 2016 Integrative Medicine Research Vol.5 No.1
Background Control of the extracellular fluid volume is one of the most indispensable issues for homeostasis of the internal milieu. However, complex interdependence of the pressures involved in determination of fluid exchange makes it difficult to predict a steady-state tissue volume under various physiological conditions without mathematical approaches. Methods Here, we developed a capillary model based on the Starling's principle, which allowed us to clarify the mechanisms of the interstitial-fluid volume regulation. Three well known safety factors against edema: (1) low tissue compliance in negative pressure ranges; (2) lymphatic flow driven by the tissue pressure; and (3) protein washout by the lymph, were incorporated into the model in sequence. Results An increase in blood pressure at the venous end of the capillary induced an interstitial-fluid volume increase, which, in turn, reduced negative tissue pressure to prevent edema. The lymphatic flow alleviated the edema by both carrying fluid away from the tissue and decreasing the colloidal osmotic pressure. From the model incorporating all three factors, we found that the interstitial-fluid volume changed quickly after the blood pressure change, and that the protein movement towards a certain equilibrium point followed the volume change. Conclusion Mathematical analyses revealed that the system of the capillary is stable near the equilibrium point at steady state and normal physiological capillary pressure. The time course of the tissue-volume change was determined by two kinetic mechanisms: rapid fluid exchange and slow protein fluxes.
Purification and Characterization of a 55kDa Sialoglycoprotein from Rat Liver Lysosomal Membranes
Joon Kyum Kim,Masaru Himeno,Keitaro Kato Mie Young Kim 생화학분자생물학회 1994 BMB Reports Vol.27 No.1
A sialoglycoprotein was purified to apparent homogeneity from rat liver lysosomal membranes with a 0.1% recovery by WGA-Sepharose 6B, Con A-Sepharose, and Hydroxylapatite chromatography, Superdex TM200 FPLC gel filtration, TSK-5PW FPLC DEAF-chromatogrphy, and preparative polyacrylamide gel electrophoresis. The purified sialoglycoprotein has a molecular mass of 55 kDa (LGP55), as determined by polyacrylamide gel electrophoresis in the presence and absence of SDS. Susceptibility to neurnminidase and endoglycosidase H, and the immunoreactivity of the protein in tritosome membranes was examined in order to study the topology of the lysosomal membrane. The results suggest that LGP55 is an intact lysosomal membrane protein with oligosaccharide chains. The ten residues of the N-terminal of purified LGP55 are ; Ala-Leu-Gln-Val-Thr-Lys-Tyr-Glu-Asp-Gly.
Experiment and Numerical Calculation on Air-Water Phased Propulsion Flow of Water Rocket
Koichi Yonemoto,Takehiro Himeno,Yusuke Oshikata 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
Water rocket is propelled by ejecting water using pressurized air. When the quantity of water decreases, the water and the air are ejected simultaneously in two phased flow. Experimental and numerical studies of this kind of air-water phased ejection are few .Therefore it is not yet completely clear about the flow and thrust generation characteristics. In this study, a measurement equipment was prepared to obtain the time history of air-water propulsive characteristics. Photos of air-water phased propulsion flow were also taken using a high-speed digital video camera to examine the thrust generation mechanism. A recent paper reported that a fully disturbed and mixed air-water phased flow is established at about 0.3 seconds after water ejection start. But the present experiment tells us that an air column grows from the upper surface of water to penetrate the nozzle flow. This air-water phased nozzle flow is not fully disturbed as reported previously, but is clearly separated into the air column flow and the cylindrical water flow. A whirl airflow may occur in a certain water amount and air pressure condition. Typical flow parameters are obtained to find that the air column penetrates faster than the water ejection. Numerical calculations are conducted to clarify the air-water phased flow characteristics. The growth of the air column is well simulated as the experiment.