Shigenao Kawai

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BACKGROUND, AIM, AND SCOPE Zinc is an essential micronutrient element but its concentrations found in contaminated soils frequently exceed those required by the plant and soil organisms, and thus create danger to animal and human health. Phytoremediation is a technique, often employed in remediation of contaminated soils, which aims to remove heavy metals(More)
We investigated the mobility and distribution of cadmium (Cd), nickel (Ni) and zinc (Zn) in four contaminated soil profiles from Bangladesh. The sources of contamination of these profiles were tannery wastes, city sewage and the wastes of pharmaceutical and paper mill factories at different locations in Bangladesh. The samples were collected from the A-, B-(More)
The present study was designed to examine the effect of copper (Cu) on sorption of cadmium (Cd) to plasma membrane (PM) preparations as one of the models of competition between metals on root PM. Plasma membrane preparations were obtained from roots of barley (Hordeum vulgare L. cv. Minorimugi) and 50 μM CdSO₄ with or without 50 μM CuSO₄ were added to the(More)
Two experiments were conducted to observe the effect of arsenic (As; NaAsO2) and additional Fe3+ (Fe3+-EDTA) on phosphorus (P), iron (Fe), and As in inner and outer portions of rice roots (Oryza sativa L. cv. Akitakomachi) grown for 14 days. Measurement of elements was done with PIXE (particle-induced X-ray emission) system. The first experiment contained(More)
The precursory role of avenic acid A (AVA) in the biosynthesis of the mugineic acid family (MAs) of phytosiderophores was studied by feeding 14C or 15N labeled compounds into iron-deficient oat roots (Avena sativa L. cv. Onward). Carbon-14 of methionine was incorporated into AVA and 2′-deoxymugineic acid (DMA) in the oat roots, while 14C of homoserine was(More)
The role of methionine as a precursor in mugineic acid (MA) biosynthesis was studied by feeding 15 N-ammonium sulfate, 14 C-amino acids, and [1-14 C, 15 N]-methionine to iron-deficient barley roots (Hordeum vulgare L. cv. Minorimugi), grown hydroponically. The incorporation of isotopes into amino acids was also examined. Methionine appears to be the most(More)
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