Publications by authors named "Takuya Kawakami"

Objectives: The discordant results between fractional flow reserve (FFR) and resting full-cycle ratio (RFR) and the influence of angiographic characteristics on their correlation have not been sufficiently investigated. We aimed to identify angiographic characteristics that can predict FFR and RFR correlations using a novel angiographic scoring system.

Methods: This retrospective analysis included 220 patients with 252 intermediate coronary lesions assessed using FFR and RFR.

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  • The study investigates whether the angle of tines on the Micra leadless pacemaker affects their engagement with the heart muscle during implantation.
  • Researchers analyzed data from 93 patients and found that tines with angles less than 10 degrees were always engaged, while higher angles made engagement unpredictable.
  • The findings suggest that measuring the angle of the tines before testing can help predict whether they are securely anchored to the myocardium.
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  • Leadless pacemaker implantation has a lower risk of cardiac perforation when placed in the septum, but the effects on success rates and complications based on implantation site are not fully understood.
  • A study analyzed 67 patients who had post-procedural CT scans to compare outcomes between those with septal and non-septal placements, revealing that the non-septal group had better pacemaker performance but faced higher complication rates.
  • The findings suggest while septal placements may reduce cardiac injury risks, they could lead to poorer pacemaker performance compared to non-septal placements.
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  • Venous bleeding complications frequently occur after catheter ablation for atrial fibrillation (AF), but the specific risk factors are not well understood.
  • A study evaluated 559 patients who underwent AF catheter ablation, finding that 38.1% experienced venous bleeding complications after the procedure.
  • Independent risk factors identified include low body mass index (BMI), shorter compression time, and the use of antiplatelet therapy, suggesting that longer compression may be necessary for at-risk patients.
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We previously described an endo-acting rhamnogalacturonan (RG) lyase, termed PcRGL4A, of Penicillium chrysogenum 31B. Here, we describe a second RG lyase, called PcRGLX. We determined the cDNA sequence of the Pcrglx gene, which encodes PcRGLX.

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Sesamin is a major component in lignans of sesame seed oil, known to possess potent anti-oxidative capacity. In this study, the variation of heme oxygenase (HO)-1, a kind of anti-oxidative enzyme, by sesamin in murine macrophage cell line RAW 264.7 cells was investigated.

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Background And Objectives: Solvents used in production facility-affiliated private laboratories have been seldomly reported. This study was initiated to specify solvent use characteristics in private laboratories in comparison with the use in public research laboratories and on production floors. Elucidation of the applicability of conclusions from a public laboratory survey to private institutions is not only of scientific interest but also of practical importance.

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We previously described three α-l-arabinofuranosidases (ABFs) secreted by Penicillium chrysogenum 31B. Here, we purified a fourth ABF, termed PcABF43A, from the culture filtrate. The molecular mass of the enzyme was estimated to be 31kDa.

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Xylans are major hemicellulose components of plant cell wall which can be hydrolyzed by xylanolytic enzymes. Three forms of endo-β-1,4-xylanases (XynSW1, XynSW2A, and XynSW2B) produced by thermotolerant Streptomyces sp. SWU10 have been reported.

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Objectives: Laboratories in research institutions use organic solvents in research and development. Nevertheless, the types of solvents in use have been seldom reported. This study was initiated to elucidate types of organic solvents used in large research institutions in Japan, with a focus on possible different use among research fields.

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Performance of two new air sampling bags [the transparent bag (TP bag) and the semi-transparent bag (ST bag)] was examined as possible surrogates for the traditional PVF bag (the Ref bag). Solvent vapor mixture of butyl acetate, chloroform, ethyl acetate, isopropyl alcohol and toluene at administrative control levels were introduced to each bag (n=5 for each of the three types), and the decay in the concentrations (by%) was followed by use of a gas auto-sampler - FID-GC system. A trend of time-dependent decay was noted for all types including the Ref bag.

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In 2008-2009, types of organic solvents used and air-borne vapor concentrations were surveyed in 1909 laboratories in four large research institutions in accordance with current regulations. The results were classified into 5 groups in terms of research fields (agriculture, biology, medicine, natural science, and technology and engineering) and evaluated after the regulatory rules. Laboratory air analyses by gas chromatography identified 5 and 20 solvents out of 7 Group 1 solvents and 40 Group 2 solvents, respectively; 10 solvents were used in more than 10% of the laboratories in each of the 5 research fields.

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