Publications by authors named "Hajime Ide"

Recently, Pd-exchanged CHA zeolites (Pd-CHA) have attracted attention as promising passive NOx adsorbers (PNAs) for reducing NOx emissions during the cold start period of a vehicle engine. In this work, the relationship between the local structures and the NO adsorption/desorption properties of the Pd cations in CHA zeolites was investigated. Pd cation formation and NO adsorption were theoretically explored by density functional theory (DFT) calculations for different paired Al sites in six-/eight-membered rings (6MR/8MR).

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Atomic dispersion of metal species has attracted attention as a unique phenomenon that affects adsorption properties and catalytic activities and that can be used to design so-called single atom materials. In this work, we describe atomic dispersion of bulk Pd into small pores of CHA zeolites. Under 4% NO flow at 600 °C, bulk Pd metal on the outside of CHA zeolites effectively disperses, affording Pd cations on Al sites with concomitant formation of NO, as revealed by microscopic and spectroscopic characterizations combined with mass spectroscopy.

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Quantitative and qualitative analyses of 1-palmitoyl-2-linoleoyl-phosphatidylcholine monohydroperoxide [PC 16:0/18:2-OOH] and 1-stearoyl-2-linoleoyl-phosphatidylcholine monohydroperoxide [PC 18:0/18:2-OOH] in human plasma were improved by chemiluminescence HPLC using synthetic 1-stearoyl-2-erucoyl-phosphatidylcholine monohydroperoxide (PC 18:0/22:1-OOH) as internal standard. The calibration curves of synthetic PC 16:0/18:2-OOH and PC 18:0/18:2-OOH, obtained by their direct injections with the IS into the HPLC system, were linear throughout the calibration range (10-1000 pmol). Within-day and between-day coefficients of variation were below 8%, and the recoveries were between 84% and 101%.

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Apolipoprotein A-V (apoA-V) is a recently discovered apolipoprotein that appears to have a role in plasma triglyceride (TG) transport. We have developed an ELISA for apoA-V using monoclonal antibodies that has a lower limit of detection of 0.3 ng/ml and linearity up to 20 ng/ml.

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Protein tyrosine phosphatases (PTPases) play an essential role in the regulation of steady-state phosphorylation of the insulin receptor and other proteins in the insulin signaling pathway. To determine the role of PTPases in adipose tissue in the development into an insulin-resistant state, we examined PTPase activities and protein levels of three major candidate PTPases in adipose tissues of 26-week-old male Otsuka Long-Evans Tokushima Fatty (OLETF) rats. Particulate PTPase activities in visceral and epididymal adipose tissues of OLETF rats were increased compared to those in Long-Evans Tokushima Otsuka (LETO) rats, non-insulin-resistant controls.

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