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MICROWAVE-ASSISTED SYNTHESIS AND CATALYTIC PERFORMANCE OF HIERARCHICAL Cu2O NANOSTRUCTURES
XUE-YUN GONG,YU-PENG GAO,LI-BO WANG,PENG-FEI GUO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.5
Hierarchical Cu2O nanostructures have been successfully fabricated on a large scale using copper acetate and glucose as starting reactants, CTAB as an additive via a microwave-assisted process. The influences of CTAB dosage and reaction time on the morphology of the products were investigated. The resulting Cu2O nanostructures were characterized by means of X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). FESEM images show that the Cu2O nanostructures are microsphere, which are composed of nanoparticles. The concentration of CTAB plays a key role in the growth of Cu2O nanostructures under experimental conditions. The possible formation mechanism of these hierarchical Cu2O nanostructures has been proposed. Meanwhile, the catalytic performances of these Cu2O microspheres for thermal decomposition of ammonium perchlorate (AP) were investigated using DSC. The results revealed that Cu2O have a great influence on the thermal decomposition of AP. The additions of Cu2O powders lower the high decomposition temperature of AP.
Gong, Xue,Flores-Vergara, Miguel A.,Hong, Jing Han,Chu, Huangwei,Lim, Jun,Franks, Robert G.,Liu, Zhongchi,Xu, Jian American Society of Plant Biologists 2016 Plant Physiology Vol.170 No.3
<P>A decade of studies on middle cortex (MC) formation in the root endodermis of Arabidopsis (Arabidopsis thaliana) have revealed a complex regulatory network that is orchestrated by several GRAS family transcription factors, including SHORT-ROOT (SHR), SCARECROW (SCR), and SCARECROW-LIKE3 (SCL3). However, how their functions are regulated remains obscure. Here we show that mutations in the SEUSS (SEU) gene led to a higher frequency of MC formation. seu mutants had strongly reduced expression of SHR, SCR, and SCL3, suggesting that SEU positively regulates these genes. Our results further indicate that SEU physically associates with upstream regulatory sequences of SHR, SCR, and SCL3; and that SEU has distinct genetic interactions with these genes in the control of MC formation, with SCL3 being epistatic to SEU. Similar to SCL3, SEU was repressed by the phytohormone GA and induced by the GA biosynthesis inhibitor paclobutrazol, suggesting that SEU acts downstream of GA signaling to regulate MC formation. Consistently, we found that SEU mediates the regulation of SCL3 by GA signaling. Together, our study identifies SEU as a new critical player that integrates GA signaling with transcriptional inputs from the SHR-SCR-SCL3 module to regulate MC formation in the Arabidopsis root.</P>
NUMERICAL SIMULATION OF SYNOPTIC CONDITION ON A SEVERE SAND DUST STORM
JIANG, XUE-GONG,SHEN, JIAN-GUO,LIU, JING-TAO,CHUNG, YONG-SEUNG 한국교원대학교 환경과학연구소 2004 환경연구논문집 Vol.- No.8
By using observational data and MM5, an observational analysis and numerical study was conducted on the synoptic condition of a severe dust storm that was caused by a Mongolian cyclone which occurred from 6 to 8 April 2001. Results illustrated that the cyclogenesis was due to the isentropic potential voiticity (IPV) advection in the upper troposphere and the terrain modified baroclinicity in the mid-lower troposphere. The Altai-Sayan complex of mountains blocked the lower level cold air and made the isentropic surface sharply sleep. When the air slid down along the isentropic surface the increasing of baroclinicity and decreasing of stability blew up the vertical voiticity development. The formation of the dust storm was a result of a cyclonic cold front passing across the area. The occurrence of this dust storm was closely related to the strong surface wind, which was accompanied by a cold front passing, rather than the cyclogenesis, itself. Hence, the reason for the pre-front dust stonn formulation was the formation of heating convection. Reasons behind the formation of a black storm (visibility lower than 50 m), which occurred in the mid-north part of Inner Mongolia, lay in several aspects. Firstly, in this area the surface wind was strong, a direct result of the downward transport in mid-lower troposphere. Secondly, the cold front passed over the effected area near sunset so the air obtained much more surface heating to form a deeper mixed layer (ML). Thirdly, cooperation between the lower level wind and the terrain made the atmosphere in this area and acquired the maximum advective contribution necessary to form a deep post-front ML. The sensitivity experiment revealed that surface heal flux was important to the frontal lifting. In addition, the forcing of surface heating was also seen as the primary forcing mechanism of frontogenesis. Meanwhile, removal of the surface heat flux made the atmospheric stratification became stable and the pre-storm ML very shallow, which weakened the strength of the dust storm.
Anti-Oxidation of Cultured Cordyceps militaris Growing on Silkworm Pupa
Gong Cheng-Liang,Pan Zhong-Hua,Zheng Xiao-Jian,Xue Ren-Yu,Cao Guang Li Korean Society of Sericultural Science 2006 International Journal of Industrial Entomology Vol.12 No.1
Cordyceps, one of the well-known traditional Chinese medicines, consists of the dried fungus C. sinensis growing on the larva of caterpillar. It is commonly used as a tonic of restoring vital body functions. In order to evaluate the pharmacological effects of C. militaris, the anti-oxidation and antiaging effect of cultured C. militaris growing on pupa of silkworm Bombyx mori, were investigated. The results showed! that the contents of lipofusin in myocardium were reduced and the SOD activity in the liver were elevated in a dose-dependent manner while no effect was observed for blood GSH-Px activity and liver MDA content in mice perfused with the cultured C. militaris compared to those untreated mice. Furthermore, the average life span, maximum life span and 50% death time of the fruit flies treated with cultured C. militaris were markedly prolonged. The results suggest that the cultured C. militaris growing on pupa of silkworm possesses anti-oxidation and delay senescence activity.
Xue, P.C.,Dong, B.,Zang, J.J.,Zhu, Z.P.,Gong, L.M. Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.1
Two experiments were conducted to determine the digestibility of crude protein (CP), amino acids and energy in three Chinese corn distillers dried grains with solubles (DDGS), one rice DDGS, one American corn DDGS and one American high protein distillers dried grains (HP-DDG). In Exp. 1, the apparent ileal digestibility (AID) and standardized ileal digestibility (SID) of CP and amino acids in the six samples were determined using cannulated barrows (initial BW: $43.3{\pm}1.7$ kg). In Exp. 2, the digestible energy (DE) and metabolizable energy (ME) content of these six samples were determined using crossbred barrows (initial BW: $46.0{\pm}2.5$ kg). The results of the two experiments indicated that Chinese corn DDGS is generally similar to American DDGS in chemical composition, digestibility of amino acids, DE and ME. However, Chinese DDGS had a lower Lys concentration (0.50% vs. 0.74%) and SID Lys (52.3% vs. 57.0%, p<0.01). The DE and ME values in Chinese corn DDGS were 3,427 and 3,306 kcal/kg, respectively. Rice DDGS had a similar DE and ME (3,363 and 3,228 kcal/kg) but higher Lys concentration (0.64% vs. 0.50%) to corn DDGS, while the SID of Lys was quite low (61.8%, p<0.01). HP-DDG had high value of SID of Lys, DE and ME (79.8%, 3,899 and 3,746 kcal/kg). In conclusion, except for a lower Lys concentrations and availability, the chemical composition, digestibility of amino acids, DE and ME values in Chinese corn DDGS are similar to American corn DDGS. Additionally, the rice DDGS had lower Lys content and digestible Lys values than that in corn DDGS. Thirdly, HP-DDG has higher levels of digestible amino acids and energy than DDGS.
Xue-Liang Liu,Hai-Hui Ye,Hui-Yang Huang,Jie Gong,Ya-Nan Yang 한국유전학회 2014 Genes & Genomics Vol.36 No.1
Large conductance calcium-activated potassiumchannels (Slo) play important roles in controllingneuronal excitability. At present, very little is known aboutthe function of Slo channels on ovarian development. Wecloned the SPSlo gene from the mud crab, Scylla paramamosain. This gene shows 91 and 93 % sequence identityto PISlo from the spiny lobster, Panulirus interruptus andCBSlo from the jonah crab, Cancer borealis, respectively. We isolated six variants of the SPSlo cDNA within S. paramamosain ovary tissue. Sequence analysis indicatedthat there were at least seven alternative sites in SPSlo,each with multiple alternative segments. Real-time PCRshowed that the SPSlo gene was expressed in various tissues,and highly expressed in brain and ovary. In addition,the expression of SPSlo changed throughout ovariandevelopment, highest at the early-developing stage (StageII) followed by a slow decrease in subsequent stages. Theseresults suggested that SPSlo channels may be implicated inthe ovarian development of the mud crab.
Xue Song,Jing Guo,Wen-xiu Ma,Zhi-yuan Ji,Li-fang Zou,Gong-you Chen,Hua-song Zou 한국미생물학회 2015 The journal of microbiology Vol.53 No.5
To identify novel virulence genes, a mutant library of Xanthomonas citri subsp. citri 29-1 was produced using EZ-Tn5 transposon and the mutants were inoculated into susceptible grapefruit. Forty mutants with altered virulence phenotypes were identified. Nine of the mutants showed a complete loss of citrus canker induction, and the other 31 mutants resulted in attenuated canker symptoms. Southern blot analysis revealed that each of the mutants carried a single copy of Tn5. The flanking sequence was identified by plasmid rescue and 18 different ORFs were identified in the genome sequence. Of these 18 ORFs, seven had not been previously associated with the virulence of X. citri subsp. citri and were therefore confirmed by complementation analysis. Real-time PCR analysis showed that the seven genes were upregulated when the bacteria were grown in citrus plants, suggesting that the expression of these genes was essential for canker development.