T. Iwashita

Publications209
h-index43
Citations6,236
Highly Influential Citations184
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Solution NMR Studies of the Aβ(1−40) and Aβ(1−42) Peptides Establish that the Met35 Oxidation State Affects the Mechanism of Amyloid Formation
TLDR
With the use of a special disaggregation protocol, the highly aggregation prone Aβ peptides could be studied at higher, millimolar concentrations (as required by NMR) in aqueous solution at neutral pH, remaining largely monomeric at 5 °C as determined by the NMR results.
A specific transporter for iron(III)-phytosiderophore in barley roots.
TLDR
The localization and substrate specificity of HvYS1 is different from those of ZmYS1, indicating that Hvys1 is a specific transporter for iron(III)-phytosiderophore involved in primary iron acquisition from soil in barley roots.
Internal Detoxification Mechanism of Al in Hydrangea (Identification of Al Form in the Leaves)
TLDR
Observations indicate that Al is bound to citric acid in the cells of hydrangea leaves, which is in good accordance with the chemical shift for the 1:1 Al-citrate complex.
Characterization of Cd translocation and identification of the Cd form in xylem sap of the Cd-hyperaccumulator Arabidopsis halleri.
TLDR
Cd transfer from the root medium to the xylem in A. halleri is an energy-dependent process that is partly shared with Zn and/or Fe transport and is translocated from roots to shoots in inorganic forms.
Characterization of the Silicon Uptake System and Molecular Mapping of the Silicon Transporter Gene in Rice1
TLDR
The results indicate that at least two transporters are involved in silicon transport from the external solution to the xylem and that the low-silicon rice mutant is defective in loading silicon into xylesm rather than silicon uptake from external solutions to cortical cells.
Solution NMR studies of the A beta(1-40) and A beta(1-42) peptides establish that the Met35 oxidation state affects the mechanism of amyloid formation.
TLDR
The present NMR studies demonstrate that the Met35(red) --> Met 35(ox) conversion prevents aggregation by reducing both hydrophobic and electrostatic association and that the highly aggregation prone A beta peptides may associate differently, through specific, sharp changes in structure during the initial stages of aggregation.
Identification of the silicon form in xylem sap of rice (Oryza sativa L.).
TLDR
Results indicate that Si is translocated in the form of monosilicic acid through the xylem and that the concentration of monOSilicic Acid is high in the Xylem only transiently.
Inhibitory effects of oolong tea polyphenols on pancreatic lipase in vitro.
TLDR
Data suggested that the presence of galloyl moieties within their chemical structures and/or the polymerization of flavan-3-ols were required for enhancement of pancreatic lipase inhibition.
Inhibitory Effects of Oolong Tea Polyphenols on Pancreatic Lipase in Vitro
TLDR
Data suggested that the presence of galloyl moieties within the structure was required for enhancement of pancreatic lipase inhibition, and it was well-known that flavan-3-ols are polymerized by polyphenol oxidase and/or heating in a manufacturing process of oolong tea.
Identification of the form of Cd in the leaves of a superior Cd-accumulating ecotype of Thlaspi caerulescens using 113Cd-NMR
TLDR
It is suggested that the complex forms inside the vacuoles as a result of an efficient tonoplast transport of Cd and a constitutively high concentration of malate in the vacUoles, and that the formation of the Cd-malate complex may lead to a decrease of subsequent Cd efflux to the cytoplasm.
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