Naoki Katsura

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The effects of gibberellin (GA) on cold-induced stem elongation and flowering of Japanese radish (Raphanus sativus L.) were investigated using application of GA3 and a GA-biosynthesis inhibitor, uniconazole (UCZ). UCZ very strongly inhibited stem elongation and delayed flowering, and the inhibition and delay were completely reversed by GA3 application.(More)
A metalloprotease has been isolated from matrix vesicles of chicken epiphyseal cartilage and subsequently characterized. Matrix vesicles obtained by collagenase digestion and differential centrifugation were further purified by Sepharose CL2B gel filtration. The protease was solubilized from the vesicles by treatment with deoxycholate and freeze-thawing,(More)
The precipitation of inorganic crystals from body fluid requires (A) elimination of the macromolecules that inhibit for crystal formation, (B) sufficient supersaturation of the relevant ions, and (C) local restriction of molecular movement. All of these must be accomplished within a space of several nanometers width. Such a nanospace excludes most peptides(More)
gibberellins (GAs) might be involved in the control of bolting of R, sativus, because an application of GA3 induced bolting of nonvernalized R, sativus,i) However, information concerning endogenous GAs in R. sativus is quite limited, Our overall plan ig to analyze endogenous GAs at various developmental stages of R. .vativus to determine the relationship(More)
A novel method is described for the extraction of DNAs from fungi and yeasts. Anhydrous hydrogen fluoride (HF) selectively cleaves their cell walls under mild conditions (for 5 min at 0 degrees C), enabling the effective extraction of DNAs from organisms with a cell wall. A possible mechanism for this method concerning the selective cleavage of O-glycosidic(More)
The degradation of MgCl2-extracted proteoglycans (PG) from bovine nasal and articular cartilage was performed by using human rheumatoid synovial tissue extract, and the products were compared with that of being degraded by different commercially available proteases. 2. Degradation of PG by crude synovial extract occurred under the wide range of pH, and the(More)
1. Proteolytic enzymes are likely to play the main role on the proteoglycan (PG)-degrading activity of rheumatoid synovium. In this paper, the presence of cathepsin D, cathepsin B, lysosomal elastase and cathepsin G in rheumatoid synovium is established by isolation, purification, and characterization of these proteases. 2. The degradation of(More)
We previously reported that DNAs directly applicable to restriction analyses and transformation of Escherichia coli can be extracted from fungi and yeasts by use of anhydrous hydrogen fluoride (HF) under a mild condition, 5 min at 0 degrees C [Oshiro, S., Katsura, N., Kitada, K., and Gunge, N. (1987) FEBS Lett. 220, 383-386]. In the present investigation,(More)
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