Keiji Takagi

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BACKGROUND Gingival melanin pigmentation may cause esthetic concerns, even if no serious medical problem is present. As an inhibitor of melanin formation, ascorbic acid is often used to treat skin melanin pigmentation. Thus, the present study investigated the effects of ascorbic acid on gingival melanin pigmentation in vitro and in vivo. METHODS The(More)
Flavanol values, molecular weight distributions, polyphenolic patterns, and tyrosinase inhibitions of proanthocyanidins (PACs) from karamatsu (Larix sp.) bark, acacia Morishima (Acacia mearnsii) bark, and commercial quebracho (Schinopsis lorentzii) extracts were examined to investigate the relation between the structures of PACs from woody plants and(More)
  • Keiji Takagi
  • IEEE transactions on ultrasonics, ferroelectrics…
  • 2003
Experimental studies are carried out on phase noise and the correlation coefficient between the phase and average current noises of voltage-controlled oscillator in phased-locked loop (PLL) systems. The precise phase stabilization technique is discussed, and new methods to reduce the phase noise are described in PLL systems, using the correlation.
We have investigated the effects of rhapontin on proliferation and DNA of human stomach cancer KATO III cells. Growth inhibition and induction of apoptosis by rhapontin were observed in the KATO III cells. Morphological change showing apoptotic bodies was observed in the KATO III cells treated with rhapontin. The fragmentation of DNA by rhapontin to(More)
Case 1: A-35-year-old woman was diagnosed as cervical cancer Stage IIIb. When admitted to the hospital, her tumor marker SCC level was 50 ng/mL. Concurrent chemoradiation therapy was started on November, 2005. The SCC level was reduced by 0.9 ng/mL in February, 2006. In April, tumor recurrence was found by PET, and chemotherapy was restarted, but the SCC(More)
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