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Search Results: 1 - 10 of 32626 matches for " Yanfen Huang "
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Introduction of a new atmospheric pressure plasma device and application on tomato seeds  [PDF]
Zhuwen Zhou, Yanfen Huang, Size Yang, Wei Chen
Agricultural Sciences (AS) , 2011, DOI: 10.4236/as.2011.21004
Abstract: We designed new atmospheric pressure plasma device, to explore appropriate voltage of plasma treatment that promote traits and yield of to-mato, tomato seeds were treated by plasma at 4760 to 6800 V, and traits and yield of tomato were observed. The results showed that the ef-fects of different voltage plasma treatments on seed germination were not the same. The bloom times, the height, the caulis, the extent of the plants and the average weight, length,diameter of each fruit in the seven treatment groups from 4760 to 6800 V were increased distinctly. The tomato yields of seven different plasma voltage treated groups were increased than the un-treated (CK). In most indexes of our tests, ef-fects of (5440 ~ 6120 V) plasma voltage treat-ments were better than of other voltages, the best was 6120 V plasma voltage treatment. So the tomato yield increase and the most the botany properties of the tomato are improved. The discharges were not uniform and the pow-ers were lower in low voltages (4760 ~ 5100V), and the discharge powers were higher in high voltages (6460 ~ 6800V). There was a step un-altered violet blue light from 5440V to 6120V, it was nearly uniform discharges, it maybe due to the energy of the electron and the active air particles in the plasma increasing with atmos-pheric plasma voltage adding, more electric charges are produced per unit time and cannot be neutralized at once, which can strengthen the reaction between the active air particles and seeds. The active air particles and ultraviolet radiation can penetrate into the capsule of the seeds,accelerate to decompose the inner nu-triment of the seeds, reduce relative penetrabil-ity of cell velum, improve the activities of the root of the tomato seedling. Test data of fruit yield of the tomato are consistent with the sta-tistical regressive line.
Mechanism of oxidative damage to DNA by Fe-loaded MCM-41 irradiated with visible light
XiaoXing Wang,Yan Gu,YanFen Fang,YingPing Huang
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-012-5042-1
Abstract: The mechanism of oxidative damage to deoxyribonucleic acid (DNA) by iron-containing mesoporous molecular sieves (MCM-41) irradiated with visible light was elucidated. Fe-loaded MCM-41 (Fe/MCM-41) was used as a photocatalyst and the damage to calf thymus DNA caused by hydrogen peroxide (H2O2) was studied. The damage and extent of oxidation of DNA were measured by high-performance liquid chromatography (HPLC) and intermediate products were detected by HPLC/electrospray ionization tandem mass spectrometry. Electron spin resonance was used to detect changes in reactive oxygen species and peroxidase catalytic spectrophotometry was used to determine the concentration of H2O2. The results indicated that Fe/MCM-41 efficiently activated H2O2 in solution at pH 4.0–8.0 under irradiation with visible light. The photocatalytic system degraded DNA most effectively at pH 5.0–6.0 but also operated at pH 8.0. At pH 4.2, the degree of DNA damage reached 25.65% after 5 h and the kinetic constant was 5.89×10 2 min 1. Damage to DNA was predominantly caused by hydroxyl radicals generated in the system. The mechanism of DNA damage is of potential concern to human health because it can occur in neutral solutions irradiated by visible light.
Kinetic investigation of in situ growth of CdMoO4 nano-octahedra
YanFen Li,JunYing Jiang,GaoChao Fan,YuJie Ma,ZaiYin Huang
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-010-4248-3
Abstract: CdMoO4 nano-octahedra were grown in situ at room temperature by reverse-microemulsion. Energy evolution from this growth process was monitored using microcalorimetry. The microcalorimetric heat flow (MCHF) curve showed a characteristic endothermic peak for the initial reaction, and double discontinuous exothermic peaks for the subsequent crystal growth. Combined with complementary characterization techniques, the evolution of morphology and size of the CdMoO4 nano-octahedra were correlated with the MCHF peaks. Calculations based on the microcalorimetric results at 298.15 K provided rate constants of 7.56×10 5 s 1 for the reaction and nucleation process and 1.59×10 4 s 1 for the crystallization process.
Visible light-induced degradation of organic pollutants using Fe(II) supported on silica gel as an effective catalyst
Chao Zhao,YingPing Huang,YanFen Fang,LiRong Jiang,LiMing Liu,King Tong Lau
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-007-0524-2
Abstract: Silica gel-supported Fe(II) (SiOFe) was prepared and used for heterogeneous degradation of sulforhodamine B (SRB) and 2,4-dichlorophenol (DCP) under visible irradiation (λ > 420 nm) as an effective catalyst. UV-visible spectra, and infrared Spectrophotometry (IR), fluorescence, total organic carbon (TOC) and electron spin resonance (ESR) measurements were employed to analyze the photoreaction products. The results showed that SRB could be efficiently degraded by SiOFe/H2O2 system under visible irradiation with 100% decolorization and 72.3% TOC removal after 180 min illumination. The results of ESR and fluorescence measurements indicated that the oxidative process was predominated mainly by the hydroxyl radical (·OH) generated in the system.
Catalysis of organic pollutant photodegradation by metal phthalocyanines immobilized on TiO2@SiO2
ShuLian Wang,YanFen Fang,Yong Yang,JunZi Liu,AnPing Deng,XiaoRong Zhao,YingPing Huang
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-010-4280-3
Abstract: A TiO2@SiO2 hybrid support was prepared by the sol-precipitation method using n-octylamine as a template. The photocatalyst manganese phthalocyanine tetrasulfonic acid (MnPcS) was immobilized on the support to form MnPcS-TiO2@SiO2. X-ray diffraction (XRD) and UV-Visible diffuse reflectance spectra (UV-Vis DRS) were employed to characterize the catalyst. The photocatalytic degradation of rhodamine B (RhB) and the catalytic oxidation of o-phenylenediamine (OPDA) under visible light irradiation were used as probe reactions. The mineralization efficiency and the degradation mechanism were evaluated using chemical oxygen demand (CODCr) assays and electron spin resonance (ESR), respectively. RhB was efficiently degraded by immobilized MnPcS-TiO2@SiO2 under visible light irradiation. Complete decolorization of RhB occurred after 240 min of irradiation and 64.02% CODCr removal occurred after 24 h of irradiation. ESR results indicated that the oxidation process was dominated by the hydroxyl radical (·OH) and superoxide radical (O 2 · ) generated in the system.
PCR-DGGE detection of the bacterial community structure in the Inner Mongolia steppe with two different DNA extraction methods

Zhou Xiaoqi,Wang Yanfen,Cai Ying,Huang Xiangzhong,Hao Yanbin,Tian Jianqing,Chai Tuanyao,

生态学报 , 2007,
Abstract:
Visible light-induced degradation of organic pollutants using Fe(II) supported on silica gel as an effective catalyst
ZHAO Chao,HUANG YingPing,FANG YanFen,JIANG LiRong,LIU LiMing,King Tong Lau,

科学通报(英文版) , 2008,
Abstract: Silica gel-supported Fe(II) (SiOFe) was prepared and used for heterogeneous degradation of sulforhodamine B (SRB) and 2,4-dichlorophenol (DCP) under visible irradiation (λ > 420 nm) as an effective catalyst. UV-visible spectra, and infrared Spectrophotometry (IR), fluorescence, total organic carbon (TOC) and electron spin resonance (ESR) measurements were employed to analyze the photoreaction products. The results showed that SRB could be efficiently degraded by SiOFe/H2O2 system under visible irradiation with 100% decolorization and 72.3% TOC removal after 180 min illumination. The results of ESR and fluorescence measurements indicated that the oxidative process was predominated mainly by the hydroxyl radical (·OH) generated in the system. Supported by the National Natural Science Foundation of China (Grant Nos. 50639070 and 20373074), the Youth Outstanding Foundation of Hubei Province of China (Grant No. 2005ABB030) and the Natural Science Research Plan Project of Education Office of Hubei Province of China (Grant No. 2004Z001)
Antioxidant, Antityrosinase and Antitumor Activity Comparison: The Potential Utilization of Fibrous Root Part of Bletilla striata (Thunb.) Reichb.f.
Fusheng Jiang, Weiping Li, Yanfen Huang, Yitao Chen, Bo Jin, Nipi Chen, Zhishan Ding, Xinghong Ding
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0058004
Abstract: This study was carried out to evaluate the utilization probability of the fibrous root part (FRP) of Bletilla striata, which was usually discarded and harvesting pseudobulb part (PSP). The chemical composition, total phenolic content, DPPH radical scavenging activity, Ferric-reducing antioxidant power and tyrosinase inhibition activity were compared between FRP and PSP. Antioxidant and pro-oxidant effect as well as antitumor effect of the extract of FRP and PSP were analyzed by in vitro cell system as well. Thin layer chromatography and high performance liquid chromatography analysis indicated that the chemical compositions in the two parts were similar, but the content in FRP was much higher than PSP. Meanwhile, the FRP extracts showed higher phenolic content, stronger DPPH scavenging activity, Ferric-reducing antioxidant capacity and tyrosinase inhibition activity. Sub-fraction analysis revealed that the distribution characteristic of phenolic components and other active constituents in FRP and PSP were consistent, and mainly deposited in chloroform and acetoacetate fractions. Especially, the chloroform sub-fraction (sch) of FRP showed extraordinary DPPH scavenging activity and tyrosinase inhibition activity, with IC50 0.848 mg/L and 4.3 mg/L, respectively. Besides, tyrosinase inhibition activity was even stronger than the positive compound arbutin (31.8 mg/L). Moreover, In vitro cell system analysis confirmed that FRP extract exerts comparable activity with PSP, especially, the sub-fraction sch of FRP showed better antioxidant activity at low dosage and stronger per-oxidant activity at high dosage, and both sch of FRP and PSP can dose-dependent induce HepG2 cells apoptosis, which implied tumor therapeutic effect. Considering that an additional 0.3 kg FRP would be obtained when producing 1.0 kg PSP, our work demonstrated that FRP is very potential to be used together with PSP.
BRCA1, Hormone, and Tissue-Specific Tumor Suppression
Yanfen Hu
International Journal of Biological Sciences , 2009,
Abstract: Germline mutations of BRCA1 predispose women to breast and ovarian cancers. Elucidating molecular mechanism of tissue- and gender-specific phenomena in BRCA1-related tumors is a key to our understanding of BRCA1 function in tumor suppression. This review summarizes studies in recent years on the link between BRCA1 and estrogen/progesterone signaling pathways, as well as discusses various models underscoring a triangle relationship among BRCA1, estrogen and genome instability.
Empirical Analyses on State-owned Stockholder's Rights and the Performance of China’s Natural Monopoly Industry
Yanfen Qu
International Journal of Business and Management , 2009,
Abstract: The paper analyses the states quo of the China’s natural monopoly industry property right and selects 64 companies in electric power, the coal gas and the water production and supply industry as the sample, to analyze the state-owned stock proportion to the achievements expressed by net assets returns ratio influence. Such conclusions can be drown: First, the state-owned stock proportion and the company achievement present the non-linear correlation dependence; Second, controlling shareholder's state-owned property right nature and performance present remarkable inverse correlation, the relation of state-owned stock proportion and net assets returns ratio present inverse "U" shape. Therefore, in the present stage, the state-owned stock proportion in natural monopoly industry should be reduced. But it is not suitable to withdraw or to privatization completely, that is to say, the state-owned capital should still maintain the controlling force.
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