Masafumi Hamamoto

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The phytohormone auxin is critical for plant growth and many developmental processes. Members of the P-glycoprotein (PGP/ABCB) subfamily of ATP-binding cassette (ABC) transporters have been shown to function in the polar movement of auxin by transporting auxin over the plasma membrane in both monocots and dicots. Here, we characterize a new Arabidopsis(More)
Prenylation of the aromatic intermediate p-hydroxybenzoate (PHB) is a critical step in ubiquinone (UQ) biosynthesis. The enzyme that catalyzes this prenylation reaction is p-hydroxybenzoate polyprenyltransferase (PPT), which substitutes an aromatic proton at the m-position of PHB with a prenyl chain provided by polyprenyl diphosphate synthase. The rice(More)
Topic detection is an important subject when voluminous text data is sent continuously to a user. We examine a method to detect topics in text data using feature vectors. Feature vectors represent the main distribution of data and they are obtained by various data analysis methods. This paper examines three methods: singular value decomposition (SVD),(More)
Research Interests Data mining in multimedia and biomedical databases; Video and image classification and retrieval; Pattern and correlation discovery on multimedia, time sequences and graphs; Machine learning techniques for biomedical images and bioinformatics. Refereed Publications (In reverse chronological order. Electronic versions available at:
Many plant secondary metabolites show strong biological activities and are potentially also toxic to plants, while plants producing such active compounds are usually insensitive to their own metabolites, suggesting that they have species-specific detoxification mechanisms. In order to clarify the detoxification mechanism of alkaloids, we used cultured cells(More)
Subject Areas; growth and development, membrane and transport Number of black and white figures are 6 Number of color figures and tables are 1 2 Title: Arabidopsis ABCB21 is a facultative auxin im/exporter regulated by cytoplasmic auxin concentration Authors: Abstract The phytohormone auxin is critical for plant growth and many developmental processes.(More)
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