Molecular cloning of a peroxidase gene from poplar and its expression in response to stress   总被引：1，自引：0，他引：1  

Bae EK  Lee H  Lee JS  Noh EW  Jo J 《Tree physiology》2006,26(11):1405-1412

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Characteristics of methicillin resistant Staphylococcus aureus isolated from chicken meat and hospitalized dogs in Korea and their epidemiological relatedness     

Kwon NH  Park KT  Jung WK  Youn HY  Lee Y  Kim SH  Bae W  Lim JY  Kim JY  Kim JM  Hong SK  Park YH 《Veterinary microbiology》2006,117(2-4):304-312

Methicillin resistant Staphylococcus aureus (MRSA) is one of the most important pathogens in human and veterinary hospitals. The isolation of MRSA from animals and foodstuffs has been reported with an increased incidence. However, methicillin (oxacillin) is not used in animal husbandry or in animal hospitals in Korea. In this study, three pre-MRSA and one silent mecA-carrying methicillin susceptible S. aureus (smMSSA) were isolated from retail chicken meat, and three MRSA were isolated from hospitalized dogs in Korea. The three pre-MRSA isolates were determined to have a staphylococcal cassette chromosome mec (SCCmec) type III, and the smMSSA isolate was not classified. The animal hospital isolates were found to contain SCCmec type II. Seven and 15 S. aureus isolated from hospitalized humans and bovine milk, respectively, were also examined in this study in order to determine the epidemiological origins of MRSA. Multilocus sequencing typing (MLST) revealed that the chicken meat and bovine milk isolates were closely related to the animal hospital isolates. The SCCmec characteristics and MLST analyses indicated the possibility of the human to animal transmission of MRSA. These results highlight the importance of identifying MRSA carriers as well as intercepting MRSA transmission because MRSA is becoming increasingly widespread without any plausible relationship with the use of methicillin (oxacillin).  相似文献   

The ground state of the pseudogap in cuprate superconductors     

Valla T  Fedorov AV  Lee J  Davis JC  Gu GD 《Science (New York, N.Y.)》2006,314(5807):1914-1916

We present studies of the electronic structure of La(2-x)BaxCuO4, a system where the superconductivity is strongly suppressed as static spin and charge orders or "stripes" develop near the doping level of x = (1/8). Using angle-resolved photoemission and scanning tunneling microscopy, we detect an energy gap at the Fermi surface with magnitude consistent with d-wave symmetry and with linear density of states, vanishing only at four nodal points, even when superconductivity disappears at x = (1/8). Thus, the nonsuperconducting, striped state at x = (1/8) is consistent with a phase-incoherent d-wave superconductor whose Cooper pairs form spin-charge-ordered structures instead of becoming superconducting.  相似文献   

Flavonoids as mushroom tyrosinase inhibitors: a fluorescence quenching study     

Kim D  Park J  Kim J  Han C  Yoon J  Kim N  Seo J  Lee C 《Journal of agricultural and food chemistry》2006,54(3):935-941

Flavonoids, a group of naturally occurring antioxidants and metal chelators, can be used as tyrosinase inhibitors due to their formation of copper-flavonoid complexes. Thus, to investigate the underlying inhibition mechanism, a large group of flavonoids from several major flavones and flavonols were tested using fluorescence quenching spectroscopy. In addition, large differences in the tyrosinase inhibitory activities and chelating capacities according to the location of the hydroxyl group(s) in combination with the A and B rings in the flavonoids were confirmed. Accordingly, the major conclusions from this work are as follows: (i) The tyrosinase inhibitory activity is not only dependent on the number of hydroxyl groups in the flavonoids, (ii) the enzyme is primarily quenched by the hydroxyl group(s) of A and B rings on the ether side of the flavonoids, and (iii) the tyrosinase inhibitory activity of 7,8,3',4'-tetrahydroxyflavone is supported by a virtual model of docking with the mushroom tyrosinase, which depicts the quenching of the enzyme. The results also demonstrated that the dihydroxy substitutions in the A and B rings are crucial for Cu2+-chelate formation, thereby influencing the tyrosinase inhibitory activity.  相似文献   

Molecular and biochemical characterizations of dehydroascorbate reductase from sesame (Sesamum indicum L.) hairy root cultures   总被引：1，自引：0，他引：1  

Chun JA  Lee WH  Han MO  Lee JW  Yi YB  Goo YM  Lee SW  Bae SC  Cho KJ  Chung CH 《Journal of agricultural and food chemistry》2007,55(15):6067-6073

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Impact of the consecutive days of visible wilting on growth and yield during tassel initiation in maize (Zea Mays L.)     

Seonghyu Shin  Sang Gon Kim  Ju Seok Lee  Tae-Hoon Go  Jiyoung Shon  Shingu Kang  Jin-Seok Lee  Hwan Hee Bae  Beom-Young Son  Kang-Bo Shim  Woonho Yang  Mi-Ok Woo 《Journal of Crop Science and Biotechnology》2015,18(4):219-229

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Effectiveness of calcium hypochlorite,quaternary ammonium compounds,and sodium hypochlorite in eliminating vegetative cells and spores of Bacillus anthracis surrogate     

Jin-Hyeok Yim  Kwang-Young Song  Hyunsook Kim  Dongryeoul Bae  Jung-Whan Chon  Kun-Ho Seo 《Journal of veterinary science (Suw?n-si, Korea)》2021,22(1)

BackgroundThe spore-forming bacterium Bacillus anthracis causes anthrax, an often-fatal infection in animals. Therefore, a rapid and reliable strategy to decontaminate areas, humans, and livestock from B. anthracis is very critical.ObjectivesThe aim of this study was performed to evaluate the efficacy of sodium hypochlorite, calcium hypochlorite, and quaternary ammonium compound (QAC) sanitizers, which are commonly used in the food industry, to inhibit spores and vegetative cells of B. anthracis surrogate.MethodsWe evaluated the efficacy of sodium hypochlorite, calcium hypochlorite, and a QAC in inhibiting vegetative cells and spores of a B. anthracis surrogate. We treated a 0.1-mL vegetative cell culture or spore solution with 10 mL sanitizer. The samples were serially diluted and cultured.ResultsWe found that 50 ppm sodium hypochlorite (pH 7), 1 ppm calcium hypochlorite, and 1 ppm QAC completely eliminated the cells in vegetative state. Exposure to 3,000 ppm sodium hypochlorite (pH 7) and 300 ppm calcium hypochlorite significantly eliminated the bacterial spores; however, 50,000 ppm QAC could not eliminate all spores.ConclusionsCalcium hypochlorite and QAC showed better performance than sodium hypochlorite in completely eliminating vegetative cells of B. anthracis surrogate. QAC was ineffective against spores of the B. anthracis surrogate. Among the three commercial disinfectants tested, calcium hypochlorite most effectively eliminated both B. anthracis vegetative cells and spores.  相似文献   

Supracolloidal reaction kinetics of Janus spheres     

Chen Q  Whitmer JK  Jiang S  Bae SC  Luijten E  Granick S 《Science (New York, N.Y.)》2011,331(6014):199-202

Clusters in the form of aggregates of a small number of elemental units display structural, thermodynamic, and dynamic properties different from those of bulk materials. We studied the kinetic pathways of self-assembly of "Janus spheres" with hemispherical hydrophobic attraction and found key differences from those characteristic of molecular amphiphiles. Experimental visualization combined with theory and molecular dynamics simulation shows that small, kinetically favored isomers fuse, before they equilibrate, into fibrillar triple helices with at most six nearest neighbors per particle. The time scales of colloidal rearrangement combined with the directional interactions resulting from Janus geometry make this a prototypical system to elucidate, on a mechanistic level and with single-particle kinetic resolution, how chemical anisotropy and reaction kinetics coordinate to generate highly ordered structures.  相似文献   

论宋代的特奏名制度     

裴淑姬 《湖南农业大学学报(自然科学版)》2007,(4)

宋代科举中的特奏名制度,是中国古代科举制度中一项特殊的制度,值得注意。自太祖后期到真宗朝后期,是特奏名制度逐渐形成的时期。随着特奏名人数的大幅增加,也显露了它的某些弊端,因而在士大夫中要求废除特奏名制度的呼声不断高涨。但终宋之世,特奏名制度仍存而不废,其主要原因,除了最高统治者为贯彻重文抑武、牢笼士人的祖宗家法以外,特奏名本身所作出的某些贡献也是重要原因。  相似文献   

Urban stream restoration in Korea: Design considerations and residents’ willingness to pay     

Hyunhoe Bae   《Urban Forestry & Urban Greening》2011,10(2):119

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