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Environmental Control of Chemical Composition of the Secondary Hydroxyapatite from Japan
Kashima, Naruhiko,Tazaki, Kazue,Fyfe, W.S. The Speleological Society 1998 Journal of the speleological society of korea Vol.8 No.2
The mineral hydroxyapatite is very common species in secondary phosphates originating from guanos(HILL et at., 1997). Several mineralogical analyses of spelean hydroxyapatite exist(e.g., KASHIMA, 1968, 1979 ; MAKI et at., 1977 ; SUH et at., 1978 ; WANG, 1982 a, b), whereas detailedeochemical composition of secondary hydroxy apatites has not been reported in Japan.(omitted)
A Note on Biogenic Effects of Coralloid Speleothems in Round Mountain Lava Cave, Oregon, U.S.A.
Kashima, Naruhiko,Ogawa, Takanori The Speleological Society 1999 Journal of the speleological society of korea Vol.9 No.2
Corralloid speleothems from Round Mountain lave cave are are studied by scanning microscope and electron microprobe analyses. Scanning microscopy observation indicates that the diatom Melosira seems to contribute significantly to siliceous coralloid speleothems Electron microprobe confirms the presence of diatom and fragmental minerals(plagioclase and orthopyroxene) in coralloid speleothems. Chemical analysis of 3 diatom cells gives SiO2(74.8%), Al2O3(0.12%), FeO(0.11%), CaO(0.47%) and MgO(0.81%).
Synthesis and Biological Evaluation of Bergenin Analogues as Mushroom Tyrosinase Inhibitors
Yusei Kashima,Mitsuo Miyazawa 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.9
In this manuscript, we synthesized a series of bergenin analogues, analyzed their structural importance for two biologic activities (anitioxidant activity (ORAC) and mushroom tyrosinase inhibitory activity). Among them, compound 5 which contains catechol moiety exhibited the most antioxidant activity (3.75 μmol of Trolox equiv. per μmol of 5). Furthermore, compound 5 was found to be the most potent (IC50 value = 17.5 ± 0.04 μM) when compared with the standard tyrosinase inhibitors of arbutin (IC50 value = 221.8 ± 1.9 μM) and kojic acid (IC50 value = 46.6 ± 3.8 μM). The bergenin moiety, the ester linkage, and benzoic acid moiety of bergenin derivatives affected two biologic activities. Tyrosinase inhibitory activity was affected by substituents of benzoic acid moiety. This manuscript provides a good foundation for the design and development of new tyrosinase inhibitors.