http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Wenjie Tong(Wenjie Tong),Junying Li(Junying Li),Wenfeng Cong(Wenfeng Cong),Cuiping Zhang(Cuiping Zhang),Zhaoli Xu(Zhaoli Xu),Xiaolong Chen(Xiaolong Chen),Min Yang(Min Yang),Jiani Liu(Jiani Liu),Lei Yu 한국식물병리학회 2022 Plant Pathology Journal Vol.38 No.6
Root-knot nematode disease is a widespread and catastrophic disease of tobacco. However, little is known about the relationship between rhizosphere bacterial community and root-knot nematode disease. This study used 16S rRNA gene sequencing and PICRUSt to assess bacterial community structure and function changes in rhizosphere soil from Meloidogyne incognita-infected tobacco plants. We studied the rhizosphere bacterial community structure of M. incognita-infected and uninfected tobacco plants through a paired comparison design in two regions of tobacco planting area, Yuxi and Jiuxiang of Yunnan Province, southwest China. According to the findings, M. incognita infection can alter the bacterial population in the soil. Uninfested soil has more operational taxonomic unit numbers and richness than infested soil. Principal Coordinate Analysis revealed clear separations between bacterial communities from infested and uninfested soil, indicating that different infection conditions resulted in significantly different bacterial community structures in soils. Firmicutes was prevalent in infested soil, but Chloroflexi and Acidobacteria were prevalent in uninfested soil. Sphingomonas, Streptomyces, and Bradyrhizobium were the dominant bacteria genera, and their abundance were higher in infested soil. By PICRUSt analysis, some metabolism-related functions and signal transduction functions of the rhizosphere bacterial community in the M. incognita infection-tobacco plants had a higher relative abundance than those uninfected. As a result, rhizosphere soils from tobacco plants infected with M. incognita showed considerable bacterial community structure and function alterations.
Chen, Junying,Yoon, Heejung,Lee, Yong-Min,Seo, Mi Sook,Sarangi, Ritimukta,Fukuzumi, Shunichi,Nam, Wonwoo Royal Society of Chemistry 2015 Chemical Science Vol.6 No.6
<▼1><P>Binding of two HOTf molecules to Mn<SUP>IV</SUP>(O) species resulted in contrasting effects on the reactivities in oxygen atom transfer and H-atom transfer reactions.</P></▼1><▼2><P>Triflic acid (HOTf)-bound nonheme Mn(<SMALL>IV</SMALL>)-oxo complexes, [(L)Mn<SUP>IV</SUP>(O)]<SUP>2+</SUP>–(HOTf)<SUB>2</SUB> (L = N4Py and Bn-TPEN; N4Py = <I>N</I>,<I>N</I>-bis(2-pyridylmethyl)-<I>N</I>-bis(2-pyridyl)methylamine and Bn-TPEN = <I>N</I>-benzyl-<I>N</I>,<I>N</I>′,<I>N</I>′-tris(2-pyridylmethyl)ethane-1,2-diamine), were synthesized by adding HOTf to the solutions of the [(L)Mn<SUP>IV</SUP>(O)]<SUP>2+</SUP> complexes and were characterized by various spectroscopies. The one-electron reduction potentials of the Mn<SUP>IV</SUP>(O) complexes exhibited a significant positive shift upon binding of HOTf. The driving force dependences of electron transfer (ET) from electron donors to the Mn<SUP>IV</SUP>(O) and Mn<SUP>IV</SUP>(O)–(HOTf)<SUB>2</SUB> complexes were examined and evaluated in light of the Marcus theory of ET to determine the reorganization energies of ET. The smaller reorganization energies and much more positive reduction potentials of the [(L)Mn<SUP>IV</SUP>(O)]<SUP>2+</SUP>–(HOTf)<SUB>2</SUB> complexes resulted in greatly enhanced oxidation capacity towards one-electron reductants and <I>para</I>-X-substituted-thioanisoles. The reactivities of the Mn(<SMALL>IV</SMALL>)-oxo complexes were markedly enhanced by binding of HOTf, such as a 6.4 × 10<SUP>5</SUP>-fold increase in the oxygen atom transfer (OAT) reaction (<I>i.e.</I>, sulfoxidation). Such a remarkable acceleration in the OAT reaction results from the enhancement of ET from <I>para</I>-X-substituted-thioanisoles to the Mn<SUP>IV</SUP>(O) complexes as revealed by the unified ET driving force dependence of the rate constants of OAT and ET reactions of [(L)Mn<SUP>IV</SUP>(O)]<SUP>2+</SUP>–(HOTf)<SUB>2</SUB>. In contrast, deceleration was observed in the rate of H-atom transfer (HAT) reaction of [(L)Mn<SUP>IV</SUP>(O)]<SUP>2+</SUP>–(HOTf)<SUB>2</SUB> complexes with 1,4-cyclohexadiene as compared with those of the [(L)Mn<SUP>IV</SUP>(O)]<SUP>2+</SUP> complexes. Thus, the binding of two HOTf molecules to the Mn<SUP>IV</SUP>(O) moiety resulted in remarkable acceleration of the ET rate when the ET is thermodynamically feasible. When the ET reaction is highly endergonic, the rate of the HAT reaction is decelerated due to the steric effect of the counter anion of HOTf.</P></▼2>
A Mononuclear Non-Heme Manganese(IV)–Oxo Complex Binding Redox-Inactive Metal Ions
Chen, Junying,Lee, Yong-Min,Davis, Katherine M.,Wu, Xiujuan,Seo, Mi Sook,Cho, Kyung-Bin,Yoon, Heejung,Park, Young Jun,Fukuzumi, Shunichi,Pushkar, Yulia N.,Nam, Wonwoo American Chemical Society 2013 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.135 No.17
<P>Redox-inactive metal ions play pivotal roles in regulating the reactivities of high-valent metal–oxo species in a variety of enzymatic and chemical reactions. A mononuclear non-heme Mn(IV)–oxo complex bearing a pentadentate N<SUB>5</SUB> ligand has been synthesized and used in the synthesis of a Mn(IV)–oxo complex binding scandium ions. The Mn(IV)–oxo complexes were characterized with various spectroscopic methods. The reactivities of the Mn(IV)–oxo complex are markedly influenced by binding of Sc<SUP>3+</SUP> ions in oxidation reactions, such as a ∼2200-fold increase in the rate of oxidation of thioanisole (i.e., oxygen atom transfer) but a ∼180-fold decrease in the rate of C–H bond activation of 1,4-cyclohexadiene (i.e., hydrogen atom transfer). The present results provide the first example of a non-heme Mn(IV)–oxo complex binding redox-inactive metal ions that shows a contrasting effect of the redox-inactive metal ions on the reactivities of metal–oxo species in the oxygen atom transfer and hydrogen atom transfer reactions.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2013/jacsat.2013.135.issue-17/ja312113p/production/images/medium/ja-2012-12113p_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja312113p'>ACS Electronic Supporting Info</A></P>
Chen, Junying,Cho, Kyung-Bin,Lee, Yong-Min,Kwon, Yoon Hye,Nam, Wonwoo The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.66
<▼1><P>The HAT and OAT reactivities of Fe<SUP>IV</SUP>O and Mn<SUP>IV</SUP>O species with the N4Py ligand are compared both theoretically and experimentally and the reactivity of Fe<SUP>IV</SUP>O is found to be higher.</P></▼1><▼2><P>Reactivities of mononuclear nonheme iron(iv)–oxo and manganese(iv)–oxo complexes bearing a pentadentate N4Py ligand, [M<SUP>IV</SUP>O(N4Py)]<SUP>2+</SUP> (M = Fe and Mn), are compared in hydrogen atom transfer (HAT) and oxygen atom transfer (OAT) reactions; theoretical and experimental results show that Fe<SUP>IV</SUP>O is more reactive than Mn<SUP>IV</SUP>O. The latter is shown to react through excited state reactivity (ESR).</P></▼2>
Hong Gao,Junying Zhang,Min Li,Kejia Liu,Dong Guo,Yue Zhang 한국물리학회 2013 Current Applied Physics Vol.13 No.5
The surface electric property of Cu2O microcrystal affects the interaction of facets with substance in the aqueous solution, and hence plays a key role in determining the photocatalytic activity. In this paper, the capability of Cu2O microcrystals with exclusive {111}, {110} or both lattice surfaces in reducing Agþ to Ag0were investigated. Ag particles selectively deposited on {111} surfaces of Cu2O, while not on {110} surfaces. The different behaviors of the two surfaces are mainly attributed to their different electric properties:negatively-charged {111} surfaces absorb Agþ ions while positively-charged {110} surfaces repel them. Raman scattering of Cu2O {111} surfaces was enhanced by the photo-deposition of Ag particles.