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Kim, Kyung-Min,Uchimiya, Hirofumi,Sohn, Jae-Keun 경북대학교 농업과학기술연구소 2012 慶北大農學誌 Vol.30 No.1
We identified cdf based on screening of the Arabidopsis cDNA library for functional suppressors of the AtBI-1 (a gene described to suppress the cell death induced by Bax gene expression in yeast). The cdf was located on Chr. V and was composed of 5 exons and 4 introns. It encodes a protein of 258 amino acid residues with a molecular weight of 28.8 kDa. The protein has 3 transmembrane domains in the C-terminal region. The cdf has one homologue, named cdf2, which was found in Arabidopsis. Like cdf, cdf2 also induced growth defect in yeast. The effect of the cell growth defect factor was somewhat lower than Bax. cdf could arrest the growth of yeast. Its localization to the nucleus was essential for the suppression of yeast cell proliferation. Morphological abnormality of intracellular network, which is a hallmark of AtBI-1, was attenuated by expression of cdf.
Global demand for rare earth resources and strategies for green mining
Dutta, Tanushree,Kim, Ki-Hyun,Uchimiya, Minori,Kwon, Eilhann E.,Jeon, Byong-Hun,Deep, Akash,Yun, Seong-Taek Elsevier 2016 Environmental research Vol.150 No.-
<P><B>Abstract</B></P> <P>Rare earth elements (REEs) are essential raw materials for emerging renewable energy resources and ‘smart’ electronic devices. Global REE demand is slated to grow at an annual rate of 5% by 2020. This high growth rate will require a steady supply base of REEs in the long run. At present, China is responsible for 85% of global rare earth oxide (REO) production. To overcome this monopolistic supply situation, new strategies and investments are necessary to satisfy domestic supply demands. Concurrently, environmental, economic, and social problems arising from REE mining must be addressed. There is an urgent need to develop efficient REE recycling techniques from end-of-life products, technologies to minimize the amount of REEs required per unit device, and methods to recover them from fly ash or fossil fuel-burning wastes.</P>
Dutta, Tanushree,Kim, Ki-Hyun,Uchimiya, Minori,Kumar, Pawan,Das, Subhasish,Bhattacharya, Satya Sundar,Szulejko, Jan Elsevier 2016 Environmental research Vol.151 No.-
<P><B>Abstract</B></P> <P>Large-scale assemblies of people in a confined space can exert significant impacts on the local air chemistry due to human emissions of volatile organics. Variations of air-quality in such small scale can be studied by quantifying fingerprint volatile organic compounds (VOCs) such as acetone, toluene, and isoprene produced during concerts, movie screenings, and sport events (like the Olympics and the World Cup). This review summarizes the extent of VOC accumulation resulting from a large population in a confined area or in a small open area during sporting and other recreational activities. Apart from VOCs emitted directly from human bodies (e.g., perspiration and exhaled breath), those released indirectly from other related sources (e.g., smoking, waste disposal, discharge of food-waste, and use of personal-care products) are also discussed. Although direct and indirect emissions of VOCs from human may constitute <1% of the global atmospheric VOCs budget, unique spatiotemporal variations in VOCs species within a confined space can have unforeseen impacts on the local atmosphere to lead to acute human exposure to harmful pollutants.</P>
Mechanisms of antimony adsorption onto soybean stover-derived biochar in aqueous solutions
Vithanage, M.,Rajapaksha, A.U.,Ahmad, M.,Uchimiya, M.,Dou, X.,Alessi, D.S.,Ok, Y.S. Academic Press 2015 Journal of environmental management Vol.151 No.-
Limited mechanistic knowledge is available on the interaction of biochar with trace elements (Sb and As) that exist predominantly as oxoanions. Soybean stover biochars were produced at 300 <SUP>o</SUP>C (SBC300) and 700 <SUP>o</SUP>C (SBC700), and characterized by BET, Boehm titration, FT-IR, NMR and Raman spectroscopy. Bound protons were quantified by potentiometric titration, and two acidic sites were used to model biochar by the surface complexation modeling based on Boehm titration and NMR observations. The zero point of charge was observed at pH 7.20 and 7.75 for SBC300 and SBC700, respectively. Neither antimonate (Sb(V)) nor antimonite (Sb(III)) showed ionic strength dependency (0.1, 0.01 and 0.001 M NaNO<SUB>3</SUB>), indicating inner sphere complexation. Greater adsorption of Sb(III) and Sb(V) was observed for SBC300 having higher -OH content than SBC700. Sb(III) removal (85%) was greater than Sb(V) removal (68%). Maximum adsorption density for Sb(III) was calculated as 1.88 x 10<SUP>-6</SUP> mol m<SUP>-2</SUP>. The Triple Layer Model (TLM) successfully described surface complexation of Sb onto soybean stover-derived biochar at pH 4-9, and suggested the formation of monodentate mononuclear and binuclear complexes. Spectroscopic investigations by Raman, FT-IR and XPS further confirmed strong chemisorptive binding of Sb to biochar surfaces.
Dutta, Tanushree,Kwon, Eilhann,Bhattacharya, Satya Sundar,Jeon, Byong Hun,Deep, Akash,Uchimiya, Minori,Kim, Ki-Hyun Wiley (Blackwell Publishing) 2017 Global change biology. Bioenergy Vol.9 No.6
<P>Residual pollutants including polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), and carbon (aceous) nanoparticles are inevitably generated during the pyrolysis of waste biomass and remain on the solid coproduct called biochar. Such pollutants could have adverse effects on the plant growth as well as microbial community in soil. Although biochar has been proposed as a 'carbon negative strategy' to mitigate the greenhouse gas emissions, the impacts of its application with respect to long-term persistence and bioavailability of hazardous components are not clear. Moreover, the co-occurrence of low molecular weight VOCs with PAHs in biochar may exert further phytotoxic effects. This review describes the basic need to unravel key mechanisms driving the storage vs. emission of these organics and the dynamics between the sorbent (biochar) and soil microbes. Moreover, there is an urgent need for standardized methods for quantitative analysis of PAHs and VOCs in biochar under environmentally relevant conditions. This review is also extended to cover current research gaps including the influence of biochar application on the short- and long-term fate of PAHs and VOCs and the proper control tactics for biochar quality and associated risk.</P>
Mammalian Bax initiates plant cell death through organelle destruction
Yoshinaga, Keiko,Arimura, Shin-ich,Hirata, Aiko,Niwa, Yasuo,Yun, Dae-Jin,Tsutsumi, Nobuhiro,Uchimiya, Hirofumi,Yamada, Maki Kawai Plant molecular biology and biotechnology research 2005 Plant molecular biology and biotechnology research Vol.2005 No.
Mammalian Bax is known to cause cell death when expressed in plants. We examined transgenic plants expressing both Bax and oraganelle-targeted green fluorescent protein to determine the cellular changes that occur during Bax-induced cell death. The mitochondria changed morphologically from being bacilli-shaped to being round, eventually becoming swollen. Mitochondria streaming also stopped. The chloroplasts lost membrane function and their contents leaked out, followed by the disruption of the vacuole. Light was not essential for Bax-induced ion leakage or organelle disruption. These results indicate that Bax-induces temporal and spatial cell death events at the organelle level in the plant. A heterologous system, using Bax, would therefor be available to investigate cell death, which is commonly conserved in animals and plants