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Pasteuria penetrans의 처리방법에 따른 땅콩뿌리혹선충 (Meloidogyne arenaria) 방제효과
Yong-Zhe Zhu,박동식(Dong-Sik Park),조명래(Myoung Rae Cho),허장현(Jang-Hyun Hur),임춘근(Chun-Keun Lim) 한국농약과학회 2005 농약과학회지 Vol.9 No.4
This study was investigated to compare the suppression of Meloidogyne arenaria by different treatments of Pasteuria penetrans which is known for biological control agent against Meloidogyne spp.. In order to select proper number of P. penetrans showing good suppression effect, P. penetrans were mixed with M. arenaria for attachment using three different concentration such as 3×10⁴, 3×10? and 3×10? endospores/5 g medium, followed by treating them onto the roots of tomato. After 14 weeks incubation, P. penetrans at 3×10? endospores showed highest activity against the formation of gall caused by M. arenaria. At a dose of 3×10? endospores/5 g medium, P. penetrans was treated into soil either mixing with soil or spray onto soil surface for comparing of suppressive efficacy. When the antagonistic bacterium was treated by the former method, it suppressed more effectively. Using P. penetrans at 3×10? endospores and mixing with soil method, suppression was compared among P. penetrans, PASTORIA<SUP>®</SUP>(Japan) and Fosthiazate<SUP>®</SUP>(Korea). P. penetrans was more potent than PASTORIA<SUP>®</SUP>(Japan) and as similar as Fosthiazate<SUP>®</SUP>(Korea). Therefore, these results suggested that P. penetrans can be used for controling of M. arenaria as biological control agent. Furthermore, thess results can be provided to develop environmentally-friendly nematicide.
감자흑각병(Potato Blackleg Disease) 방제를 위한 살균제 선발
Zhu Yong-Zhe,박덕환(Duck-Hwan Park),박동식(Dong-Sik Park),유용만(Yong-Man Yu),김성문(Songmun Kim),임춘근(Chun-Keum Lim),허장현(Jang-Hyun Hur) 한국농약과학회 2003 농약과학회지 Vol.7 No.2
Potato blackleg disease caused by Erwinia carotovora subsp. atroseptica has been a serious problem in Korea. It was previously reported that four mixtures [streptomycin (9.3 ppm) + copper oxide (171.6 ppm)/copper hydroxide (146.3 ppm), streptomycin sulfate (7.0 ppm) + copper oxide (171.6ppm)/copper hydroxide (146.3 ppm)] were effective for the control of E. carotovora subsp. atroseptica. in in vitro test. Using those four mixtures and two antibiotics [streptomycin (81.4 ppm) and streptomycin sulfate (61.3 ppm)], the effectiveness of control for E. carotovora subsp. atroseptica. was conducted in the field. Two antibiotics showed over 60% of control efficacy under different soil conditions, while mixtures of two antibiotics with copper compounds did not show any control effects on the infected seed potato. Two mixtures [streptomycin (27.9 ppm) + copper hydroxide (438.9 ppm), streptomycin sulfate (21.0 ppm) + copper oxide (514.8 ppm)] were effective in the control of potato blackleg disease on the infected potato plants under different climate conditions.
Metabolism of an Insecticide Fenitrothion by <i>Cunninghamella elegans</i> ATCC36112
Zhu, Yong-Zhe,Fu, Min,Jeong, In-Hong,Kim, Jeong-Han,Zhang, Chuan-Jie American Chemical Society 2017 Journal of agricultural and food chemistry Vol.65 No.49
<P>In this study, the detailed metabolic pathways of fenitrothion (FNT), an organophosphorus insecticide by <I>Cunninghamella elegans</I>, were investigated. Approximately 81% of FNT was degraded within 5 days after treatment with concomitant accumulation of four metabolites (M1–M4). The four metabolites were separated by high-performance liquid chromatography, and their structures were identified by mass spectroscopy and/or nuclear magnetic resonance. M3 is confirmed to be an initial precursor of others and identified as fenitrothion-oxon. On the basis of their metabolic profiling, the possible metabolic pathways involved in phase I and II metabolism of FNT by <I>C. elegans</I> was proposed. We also found that <I>C. elegans</I> was able to efficiently and rapidly degrade other organophosphorus pesticides (OPs). Thus, these results will provide insight into understanding of the fungal degradation of FNT and the potential application for bioremediation of OPs. Furthermore, the ability of <I>C. elegans</I> to mimic mammalian metabolism would help us elucidate the metabolic fates of organic compounds occurring in mammalian liver cells and evaluate their toxicity and potential adverse effects.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2017/jafcau.2017.65.issue-49/acs.jafc.7b04273/production/images/medium/jf-2017-04273g_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jf7b04273'>ACS Electronic Supporting Info</A></P>
Yong-Zhe Zhu,Hidong Kim,서재명 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.1
Selection of templates is important for the study of nanodevice fabrication. In the present study, we show that a wide, flat, and ultrastable Si(3 3 7)-4×1 terrace, combined with the Si(1 1 3)-4×2 facet, is converted from the Si(5 5 12)-2 × 1 surface through accumulated annealing at an elevated temperature. Scanning tunneling microscopy reveals that, in this irreversible surface structural phase transition, the surface has been gradually changed in two steps, step-roughening and atomic diffusion along a one-dimensional row. This (3 3 7)-4×1 surface is expected to be a good template for the growth of one- or two-dimensional nanostructures.
Growth Mechanism of Isolated Indium Nanowires Formed on Si(5 5 12)-2×1 Templates
Yong-Zhe Zhu,김희동,Jae M. Seo 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.3
Through self-assembly of In atoms on a reconstructed Si(5 5 12)-2×1 surface, nanowires of a width less than 5 nm have been formed. One specific site of the one-dimensional structure of the substrate turns out to be inert to arriving In atoms so that the self-assembled nanowires are well-isolated from each other, resulting in a high aspect ratio. In addition to such an isolation, keeping the same periodicity as the substrate (<i>i.e.</i>, 5.35 nm) during such self-assembly is another interesting point of the present system. In the present study, the detailed growth mechanism has been disclosed by using scanning tunneling microscopy.