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Lim, Changjin,Ahn, Jungmin,Sim, Jaehoon,Yun, Hwayoung,Hur, Joonseong,An, Hongchan,Jang, Jaebong,Lee, Seungbeom,Suh, Young-Ger The Royal Society of Chemistry 2018 Chemical communications Vol.54 No.5
<P>The enantioselective total synthesis of (+)-brasilenyne has been accomplished. The key features of the synthesis include the convergent preparation of a highly functionalized endocyclization precursor <I>via</I> selective epoxide opening, the construction of an oxonene skeleton through perfect regioselective Pd(0)-catalyzed endocyclization, and the installation of a 1,3-<I>cis</I>,<I>cis</I>-diene unit <I>via</I> a decarboxylative photophenylselenylation and site-selective selenoxide elimination sequence.</P>
Acute toxicity of a bioherbicide, F40362, Penicillium spp. Isolated from Trifolium repens L.
Lim, Jonghwan,Hwang, Younhwan,Park, Byungkwon,Jang, Beomsu,Lee, Hyangbeom,Kim, Changjin,Kim, Jongchun,Jung, Sanghee,Cho, Junghyoung,Yun, Hyoin 충남대학교 수의과대학 동물의과학연구소 2001 動物醫科學硏究誌 Vol.9 No.-
Bioherbicides are potential alternatives to chemical herbicides. F40362 strain was showed a good herbicidal activity on Trifolium repens L. and Zoysia japonica, and was identified as Penicillium species which are potentially toxigenic. Therefore, from a safety point of view to technological evaluation, isolates must be tested for potential toxicity. These studies provide more information about the potential toxicological risk of Penicillium spp, and are to get a more comprehensive understanding on the acute toxicity of biopesticide. In the present study, the LD_50 value of F40362 was above 2500 ㎎/㎏ for the oral route and above 2000 ㎎/㎏ for the dermal route. F40362, Penicillium spp, isolated from Trifolium repens L. is considered to have low acute oral and dermal toxicity based on the findings of the present studies.
Skin and Eye Irritation of a Bioherbicide, F40362, Isolated from Trifolium repens L.
Lim, Jonghwan,Hwang, Younhwan,Park, Byungkwon,Jang, Beomsu,Lee, Hyangbeom,Kim, Changjin,Kim, Jongchun,Jung, Sanghee,Cho, Junghyoung,Yun, Hyoin 충남대학교 수의과대학 동물의과학연구소 2001 動物醫科學硏究誌 Vol.9 No.-
The market for biopesticide is small but fast growing and large pest control companies are beginning to participate. The biopesticides replace conventional chemical pesticides in the foreseeable future. F40362 strain was selected by the screening of herbicidal activity on Trifolium repens L. and Zoysia japonica and was showed selective activity between Trifolium repens L. and Zoysia japonica. But, there is absolutely nc information on the mammalian physiology and toxicology of F40362. In view of a lack of information on its toxicity profiles, the present study performed the primary skin and eye irritation test in rabbits. F40362 was showed mild skin irritant under the conditions of this study and conjunctival redness and slight opacity on cornea appeared from 1 hour after application. The relevance of these irritation tests to evaluation of irritation in biopesticide remains to be further investigated.
Son, Changjin,Lim, Sangwoo The Electrochemical Society 2019 ECS journal of solid state science and technology Vol.8 No.4
<P>Selective etching of Si<SUB>3</SUB>N<SUB>4</SUB> to SiO<SUB>2</SUB> is essential in the semiconductor fabrication process. In particular, as the number of alternating Si<SUB>3</SUB>N<SUB>4</SUB>/SiO<SUB>2</SUB> multi-layered stacks increases, selective removal of Si<SUB>3</SUB>N<SUB>4</SUB> without loss of SiO<SUB>2</SUB> becomes difficult. In this study, the dissolution of Si<SUB>3</SUB>N<SUB>4</SUB> was demonstrated in superheated water without addition of H<SUB>3</SUB>PO<SUB>4</SUB>, which has been widely used to etch Si<SUB>3</SUB>N<SUB>4</SUB>. The dissolution rates of Si<SUB>3</SUB>N<SUB>4</SUB> and SiO<SUB>2</SUB> in the superheated water depended strongly on the concentration of OH<SUP>−</SUP>, and the activation energy obtained for the dissolution of Si<SUB>3</SUB>N<SUB>4</SUB> was 72.65 ± 0.95 kJ/mol. It is believed that the attack of the partially δ<SUP>+</SUP> charged Si atoms in the Si<SUB>3</SUB>N<SUB>4</SUB> by nucleophilic OH<SUP>−</SUP> was the key step in the dissolution of Si<SUB>3</SUB>N<SUB>4</SUB> in the superheated water. Because a tradeoff between the dissolution rate of Si<SUB>3</SUB>N<SUB>4</SUB> and the Si<SUB>3</SUB>N<SUB>4</SUB>-to-SiO<SUB>2</SUB> etching selectivity was observed, H<SUB>2</SUB>SiO<SUB>3</SUB> and HF were added to HCl-based superheated water for optimization. The HCl-based superheated water with the addition of 0.005 vol% HF and 0.01 M H<SUB>2</SUB>SiO<SUB>3</SUB> allowed successful fabrication of a horizontal SiO<SUB>2</SUB> trench structure on a patterned Si<SUB>3</SUB>N<SUB>4</SUB>/SiO<SUB>2</SUB> 15 pair-layered stack through selective etching of Si<SUB>3</SUB>N<SUB>4</SUB> without thinning of the SiO<SUB>2</SUB> layer.</P>