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Particuology 2018年第5期16卷 160-168页

作者： Chaiyos Chankaew Supattra Somsri Weerinradah Tapala Sugunya Mahatheeranont Chalermpong Saenjum Apinpus Rujiwatra Department of Chemistry Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand Graduate School Chiang Mai UniversityChiang Mai 50200Thailand Environmental Science Research Center Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand Department of Chemistry Faculty of ScienceMaejo UniversityChiang Mai 50290Thailand Department of Pharmaceutical Sciences Faculty of PharmacyChiang Mai UniversityChiang Mai 50200Thailand

A facile phytosynthesis of Ag/AgCl and Ag nanoparticles (NPs)was developed using a crude water extract of Citrus hystrix DC (kaffir lime)*** phytochemical and chloride contents of the extract,and various synthesis parameters were *** obtained Ag/AgCI and Ag NPs were of the cubic phase and mostly spherical in shape,Particle sizes of the yielded NPs were distributed in a narrow range with an average size of 20 and 38nm for the Ag/AgCI and Ag NPs,respectively,The reducing function of the phytochemicals and the stabilizing ability of gelatin were demonstrated,The NPs showed significant antiproliferative activities against the carcinoma HCT 116 and adenocarcinoma Caco-2 colorectal cell lines, but had a negative effect toward human *** NPs exhibited excellent antibacterial activities against Escherichia coil,Staphylococcus aureus,Pseudomonas aeruginosa and Bacillus *** inactivation kinetics obtained in the presence of the NPs showed a biphasic behavior that can be explained by the Cerf model.

关键词： Phytosynthesis Silver Silver chloride Nanoparticle Antimicrobial Anticancer

High-quality reference genes for quantifying the transcriptional responses of Oryza sativa L. (ssp. indica and japonica) to abiotic stress conditions

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Chinese Science Bulletin 2013年第16期58卷 1919-1930页

作者： MAKSUP Sarunyaporn SUPAIBULWATANA Kanyaratt SELVARAJ Gopalan Department of Biotechnology Faculty of Science Mahidol University Plant Biotechnology Institute National Research Council of Canada

Rice (Oryza sativa L.) is important to food security and is also an excellent model plant for numerous cereal crops. A functional genomics study in rice includes characterization of the expression dynamics of genes by quantitative real-time PCR (qPCR) analysis; this is a significant key for developing rice varieties that perform well in the face of adverse climate change. The qPCR analysis requires the use of appropriate reference genes in order to make any quantitative interpretations meaningful. Here, the new potential reference genes were selected from a huge public database of rice microarray experiments. The expression stability of 14 candidates and 4 conventional reference genes was validated by geNorm PLUS and NormFinder software. Seven candidates are superior to the conventionally used reference genes in qPCR and three genes can be used reliably for quantitating the expression of genes involved in abiotic stress responses. These high-quality references EP (LOC_Os05g08980), HNR (LOC_Os01g71770), and TBC (LOC_Os09g34040) worked very well in three indica genotypes and one japonica genotype. One of indica genotypes including the Jasmine rice, KDML105 developed in Thailand for which no reference genes have been reported until now.

关键词：功能基因组学胁迫反应非生物水稻胁迫条件籼稻品质实时定量PCR

Effect of chemical admixtures on properties of high-calcium fly ash geopolymer

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International Journal of Minerals,Metallurgy and Materials 2011年第3期18卷 364-369页

作者： Ubolluk Rattanasak Kanokwan Pankhet Prinya Chindaprasirt Department of Chemistry and Center for Innovation in Chemistry Faculty of Science Burapha University Sustainable Infrastructure Research and Development Center Department of Civil Engineering Faculty of Engineering Khon Kaen University

Owing to the high viscosity of sodium silicate solution, fly ash geopolymer has the problems of low workability and rapid setting time. Therefore, the effect of chemical admixtures on the properties of fly ash geopolymer was studied to overcome the rapid set of the geo-polymer in this paper. High-calcium fly ash and alkaline solution were used as starting materials to synthesize the geopolymer. Calcium chloride, calcium sulfate, sodium sulfate, and sucrose at dosages of 1wt% and 2wt% of fly ash were selected as admixtures based on concrete knowledge to improve the properties of the geopolymer. The setting time, compressive strength, and degree of reaction were recorded, and the microstructure was examined. The results show that calcium chloride significantly shortens both the initial and final setting times of the geopolymer paste. In addition, sucrose also delays the final setting time significantly. The degrees of reaction of fly ash in the geopolymer paste with the admixtures are all higher than those of the control paste. This contributes to the obvious increases in compressive strength.

关键词： geopolymers chemical admixtures setting time fly ash

Photocatalytic degradation of paraquat using nano-sized Cu-TiO_2 /SBA-15 under UV and visible light

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Journal of Environmental Sciences 2012年第6期24卷 1125-1132页

作者： Maurice G.Sorolla II Maria Lourdes Dalida Pongtanawat Khemthong Nurak Grisdanurak Department of Chemical Engineering College of EngineeringUniversity of the PhilippinesDiliman 1101Quezon CityPhilippines National Nanotechnology Center National Science and Technology Development AgencyKlong LuangPathumthani 12120Thailand Department of Chemical Engineering NCE for Environmental and Hazardous Waste ManagementFaculty of EngineeringThammasat UniversityPathumthani 12120Thailand

Photocatalytic degradation of paraquat using mesoporous-assembled Cu-TiO2 /SBA15 under UV and visible light was *** catalyst was synthesized by impregnation of Cu-TiO2 colloids onto *** colloids of Cu-TiO2 were prepared via solgel method while the mesoporous support was prepared using hydrothermal *** catalyst was characterized using X-ray diffraction,nitrogen adsorption-desorption,transmission electron microscopy,UV diffuse reflectance spectroscopy,Zeta potential and X-ray adsorption *** from characterizations showed that Cu doped TiO2 had a small crystalline size and was welldispersed on *** inclusion of SBA-15 significantly enhanced the photocatalytic activity of the *** the three types of undoped catalyst in this study （P25,TiO2,TiO_2 /SBA-15）,TiO2 /SBA-15 yielded the highest degradation of paraquat for all pH under UV *** 2 wt.% Cu-TiO2 /SBA-15 yielded the highest activity under visible light.

关键词： paraquat photocatalysis titania SBA-15 copper-doped

Role of support nature (γ-Al_2O_3 and SiO_2-Al_2O_3) on the performances of rhenium oxide catalysts in the metathesis of ethylene and 2-pentene

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Journal of Natural Gas Chemistry 2012年第2期21卷 158-164页

作者： Weena Phongsawat Benjamas Netiworaruksa Kongkiat Suriye Siraprapha Dokjampa Piyasan Praserthdam Joongjai Panpranot Center of Excellence on Catalysis and Catalytic Reaction Engineering Department of Chemical Engineering Faculty of Engineering Chulalongkorn University SCG Chemicals CO. Ltd. 1 Siam Cement Rd. Bangsue Bangkok 10800 Thailand

The metathesis of ethylene and 2-pentene was studied as an alternative route for propylene production over Re2O7/γ-Al2O3 and Re2O7/SiO2-Al2O3 catalysts. Both NH3 temperature-programmed desorption （NH3-TPD） and H2 temperature-programmed reduction （H2-TPR） results showed that Re2O7/SiO2-Al2O3 exhibited stronger acidity and weaker metal-support interaction than Re2O7/γ-Al2O3. At 35 60℃, isomerization free metathesis was observed only over Re2O7/γ-Al2O3, suggesting that the formation of metal-carbene metathesis active sites required only weak acidity. Our results suggest that on the Re2O7/SiO2-Al2O3, hydrido-rhenium species （[Re]-H） were formed in addition to the metathesis active sites, resulting in the isomerization of the initial 1-butene product into 2-butenes. A subsequent secondary metathesis reaction between these 2-butenes and the excess ethylene could explain the enhanced yields of propylene observed. The results demonstrate the potential for high yield of propylene from alternative feedstocks.

关键词： metathesis isomerization propylene production 2-pentene rhenium

Scaling of the Density Peak with Pellet Injection in ITER

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Plasma Science and Technology 2012年第12期14卷 1035-1040页

作者： P. KLAYWITTAPHAT T. ONJUN School of Manufacturing Systems and Mechanical Engineering Sirindhorn International Institute of TechnologyThammasat University

Scalings of the density peak and pellet penetration length in ITER are developed based on simulations using 1.5D BALDUR integrated predictive modeling code. In these simulations, the pellet ablation is described by the Neutral Gas Shielding （NGS） model with grad-B drift effect taken into account. The NGS pellet model is coupled with a plasma core transport model, which is a combination of an MMM95 anomalous transport model and an NCLASS neoclassical transport model. The BALDUR code with a combination of MMM95 and NCLASS models, together with the NGS model, is used to simulate the time evolution of plasma current, ion and electron temperatures, and density profiles for ITER standard type I ELMy H-mode discharges during the pellet injection. As a result, the scaling of the density peak and pellet penetration length at peak density can be established using this set of predictive simulations that covers a wide range of ITER plasma conditions and pellet parameters. The multiple regression technique is utilized in the development of the scalings. It is found that the scaling for density at center is sensitive to both the plasma and pellet parameters; whereas the scalings for density and location of the additional peak are sensitive to the pellet parameters only.

关键词： plasma tokamak fusion pellet injection ITER

Indigenous Microbial Community Structure in Rhizosphere of Chinese Kale as Afected by Plant Growth-Promoting Rhizobacteria Inoculation

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Pedosphere 2013年第5期23卷 577-592页

作者： P.PIROMYOU R.NOISANGIAM H.UCHIYAMA P.TITTABUTR N.BOONKERD N.TEAUMROONG School of Biotechnology Institute of Agricultural TechnologySuranaree University of Technology School of Life and Environmental Sciences Institute of Applied BiochemistryUniversity of Tsukuba

Plant growth-promoting rhizobacteria （PGPR） have been widely recognized as an important agent, especially as a biofertilizer, in agricultural systems. The objectives of this study were to select effective PGPR for Chinese kale （Brassica oleracea var. alboglabra） cultivation and to investigate the effect of their inoculation on indigenous microbial community structure. The Bacillus sp. SUT1 and Pseudomonas sp. SUT19 were selected for determining the efficiency in promoting Chinese kale growth in both pot and field experiments. In the field experiment, PGPR amended with compost gave the highest yields among all treatments. The Chinese kale growth promotion may be directly affected by PGPR inoculation. The changes of microbial community structure in the rhizosphere of Chinese kale following PGPR inoculation were examined by denaturing gradient gel electrophoresis （DGGE） and principal coordinate analysis. The DGGE fingerprints of 16S rDNA amplified from total community DNA in the rhizosphere confirmed that our isolates were established in the rhizosphere throughout this study. The microbial community structures were slightly different among all the treatments, and the major changes depended on stages of plant growth. DNA sequencing of excised DGGE bands showed that the dominant species in microbial community structure in the rhizosphere were not mainly interfered by PGPR, but strongly influenced by plant development. The microbial diversity as revealed by diversity indices was not different between the PGPR-inoculated and uninoculated treatments. In addition, the rhizosphere soil had more influence on eubacterial diversity, whereas it did not affect archaebacterial and fungal diversities.

关键词： Brassica oleracea var. alboglabra inoculum structure of microbial population

Differences in nitrite-oxidizing communities and kinetics in a brackish environment after enrichment at low and high nitrite concentrations

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Journal of Environmental Sciences 2016年第4期28卷 41-49页

作者： Wipasanee Tangkitjawisut Tawan Limpiyakorn Sorawit Powtongsook Preeyaporn Pornkulwat Benjaporn Boonchayaanant Suwannasilp Department of Environmental Engineering Faculty of EngineeringChulalongkorn University Center of Excellence on Hazardous Substance Management (HSM) Chulalongkorn University Center of Excellence for Marine Biotechnology Department of Marine ScienceFaculty of ScienceChulalongkorn University National Center for Genetic Engineering and Biotechnology National Science and Technology Development Agency

Nitrite accumulation in shrimp ponds can pose serious adverse effects to shrimp production and the *** study aims to develop an effective process for the enrichment of ready-to-use nitrite-oxidizing bacteria（NOB）inocula that would be appropriate for nitrite removal in brackish shrimp *** achieve this objective,the effects of nitrite concentrations on NOB communities and nitrite oxidation kinetics in a brackish environment were ***-bed biofilm sequencing batch reactors and continuous moving-bed biofilm reactors were used for the enrichment of NOB at various nitrite concentrations,using sediment from brackish shrimp ponds as seed *** results from NOB population analysis with quantitative polymerase chain reaction（q PCR）show that only Nitrospira were detected in the sediment from the shrimp *** the enrichment,both Nitrospira and Nitrobacter coexisted in the reactors controlling effluent nitrite at 0.1 and 0.5 mg-NO2^--N/*** the other hand,in the reactors controlling effluent nitrite at 3,20,and 100 mg-NO2^--N/L,Nitrobacter outcompeted Nitrospira in many orders of *** half saturation coefficients（Ks）for nitrite oxidation of the enrichments at low nitrite concentrations（0.1 and 0.5 mg-NO2^--N/L）were in the range of 0.71–0.98 mg-NO2^--N/*** contrast,the Ksvalues of NOB enriched at high nitrite concentrations（3,20,and 100 mg-NO2^--N/L）were much higher（8.36–12.20 mg-NO2^--N/L）.The results suggest that the selection of nitrite concentrations for the enrichment of NOB inocula can significantly influence NOB populations and kinetics,which could affect the effectiveness of their applications in brackish shrimp ponds.

关键词： Nitrite-oxidizing bacteria (NOB) Nitrospira Nitrobacter Kinetics Brackish water Shrimp ponds

Soil Organic Carbon Loss and Turnover Resulting from Forest Conversion to Maize Fields in Eastern Thailand

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Pedosphere 2011年第5期21卷 581-590页

作者： S.JAIARREE A.CHIDTHAISONG N.TANGTHAM C.POLPRASERT E.SAROBOL S.C.TYLER Joint Graduate School of Energy and Environment King Mongkut's University of Technology Thonburi Faculty of Forestry Kasetsart University Sirindhorn International Institute of Technology Thammasat University Faculty of Agriculture Kasetsart University Department of Chemistry Norco College

Soil organic carbon(SOC) content and its stable carbon isotopic composition(within the upper 1 m) were measured to determine the e?ect of land-use changes from dry evergreen forest to maize fields in eastern *** land cover maps,derived from aerial photography and satellite images for years 1989,1996,and 2002 were used in association with field surveys and farmer interviews to derive land-use history and to assist in study site *** from forest to maize cultivation for the duration of 12 years reduced SOC stocks at the rate of 6.97 Mg C ha-1 *** was most pronounced in the top 10 cm soil layer,which was 47% after 12 years of *** carbon isotope data revealed that the main fraction lost was forest-derived *** low input rates of maize-derived C were not sufficient to maintain SOC at the level prior to forest *** 12 years of continuous maize cultivation,the maize-derived C fraction made up about 20% of total SOC(5 Mg ha-1 of the total 25.31 Mg ha-1).

关键词： C stocks forest-derived C land-use change maize-derived C stable carbon isotope

Facile preparation of polybenzoxazine-based carbon microspheres with nitrogen functionalities:effects of mixed solvents on pore structure and supercapacitive performance

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Frontiers of Chemical Science and Engineering 2020年第6期14卷 1072-1086页

作者： Uthen Thubsuang Suphawadee Chotirut Apisit Thongnok Archw Promraksa Mudtorlep Nisoa Nicharat Manmuanpom Sujitra Wongkasemjit Thanyalak Chaisuwan School of Engineering and Technology Walailak UniversityNakhon Si Thammarat 80160Thailand School of Science Walailak UniversityNakhon Si TTiammarat 80160Thailand The Petroleum and Petrochemical College Chulalongkom UniversityBangkok 10330Thailand Center of Excellence on Petrochemical and Materials Technology Bangkok 10330Thailand

In this study,polybenzoxazine(PBZ)-based carbon microspheres were prepared via a facile method using a mixture of formaldehyde(F)and dimethylformamide(DMF)as the *** PBZ microspheres were successfully obtained at the F/DMF weight ratios of 0.4 and *** microspheres exhibited high nitrogen contents after *** microstructures of all the samples showed an amorphous phase and a partial graphitic *** porous carbon with the F/DMF ratio of 0.4 showed significantly higher specific capacitance(275.1 F·g^-1)than the reference carbon(198.9 F·g^-1)at 0.05 A-g This can be attributed to the synergistic electrical double-layer capacitor and pseudo-capacitor behaviors of the porous carbon with the F/DMF ratio of *** presence of nitrogen/oxygen functionalities induced pseudo-capacitance in the microspheres,and hence increased their total specific *** activation with CO2,the specific surface area of the carbon microspheres with the F/DMF ratio of 0.4 increased from 349 to 859 m^2•g^-1 and the specific capacitance increased to 424.7 F·g^-1 This value is approximately two times higher than that of the reference *** results indicated that the F/DMF ratio of 0.4 was suitable for preparing carbon microspheres with good supercapacitive *** nitrogen/oxygen functionalities and high specific surface area of the microspheres were responsible for their high capacitance.

关键词： PBZ carbon porous materials microsphere supercapacitor