cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2011.229
title: The use of English songs to improve the pronunciation of problematic English consonant sounds for Thai learners

description: This study investigates (1) whether the use of English songs can improve students’ pronunciation of the ten problematic English consonant phonemes that do not exist in Thai, /ɡ/, /v/, /z/, /r/, /θ/, /ð/, /ʃ/, /ʒ/, /ʧ/, and /ʤ/, in comparison with the use of the direct-teaching method and (2) how much students improve their pronunciation of each phoneme with the two methods. Quasi-experimental research was conducted on 30 high-school students. Fifteen students were in the direct-teaching group (the control group) and the other 15 in the English-song group (the experimental group). Descriptive statistics, paired sample t-tests and independent sample t-tests were employed to measure the students’ pronunciation improvement after receiving instruction for 15 hours over five weeks. The results revealed two things. (1) Both methods could improve the students’ overall pronunciation of the problematic phonemes at a significant level of 0.05. However, the difference between the pre- and posttest scores of the direct-teaching group was a bit greater than the other group’s. (2) The use of English songs significantly improved student pronunciation of only six out of ten phonemes, while the direct-teaching method significantly improved eight phonemes. The most problematic phoneme for both groups was /ð/, and the least problematic one was /ʃ/. Thus, it can be seen that, although learning L2 pronunciation through songs alone can be effective, it is generally not as effective as the direct-teaching method, and it does not work for certain phonemes. Some important issues that could be involved are discussed.
DOI: 10.14457/cu.the.2011.230
title: Copper catalyzed aromatization of conjugated and skipped dienes

description: This research aims to develop a new and efficient catalytic system for aromatization of conjugated and skipped dienes. A system consisting of CuCl2 as a catalyst coupled with tert-butylhydroperoxide as an oxidant. Various parameters including type of ligands, solvent, temperature and reaction time display significant effects on the efficiency of the reaction. Skipped dienes such as -terpinene and 9,10-dihydroanthracene could be aromatized in high yields at room temperature in 5 minutes. On the other hand, conjugated dienes such as α-terpinene, 9,10-dihydrophenanthrene and 1,2-dihydronaphthalene needed more severe conditions or longer reaction time to produce high yield of their corresponding aromatized products. In addition, CuCl2-TBHP also gave moderate yield of aromatized product of heterocyclic such as indoline. Further application of this catalytic system could be utilize for aromatization of zingiberene to its corrresponding product, curcumene which possessed many bioactivities.
DOI: 10.14457/cu.the.2011.231
title: Identification of bacterial and viral proteins interacting with penaeus monodon antilipopolysaccharide factor isoform 3

description: A broad-spectrum antimicrobial peptide from Penaeus monodon, namely anti-lipopolysaccharide factor isoform 3 (ALFPm3) is active against bacteria, fungi and a shrimp pathogenic virus, white spot syndrome virus (WSSV). To study in depth on ALFPm3 function in shrimp immune responses and on ALFPm3-pathogen interaction, we screened the Vibrio harveyi (VHH)- and WSSV (WH)-infected shrimp hemocytes, V. harveyi (VH) and WSSV libraries for ALFPm3 interacting protein using yeast two-hybrid technique (Y2H). Screening of the bacterial- and viral-infected shrimp hemocyte libraries could not identify any ALFPm3-interacting partners. These suggested that the ALFPm3 did not interact with other shrimp proteins during pathogenic infection, implying that the ALFPm3 solely acted on the pathogens. Accordingly, no positive clone from VH library was found to interact with ALFPm3 suggesting that the antibacterial mechanism of ALFPm3 against V. harveyi might not involve its binding to bacterial proteins. For WSSV library, five true positive clones including WSSV186, WSSV189, WSSV395, WSSV458 and WSSV471 were found to be the ALFPm3-interaction proteins. Temporal transcriptional analysis in WSSV-infected P. monodon hemocytes revealed that all WSSV genes were expressed in the late phase of infection (24 h and 48 h post infection). Then WSSV189 and WSSV471, an unknown protein, were selected for further analysis. The open reading frame (ORF) of each WSSV189 and WSSV471was cloned into pET-19b vector and subsequently transformed into different strains of Escherichia coli including BL-21(DE3), Rosetta(DE3)pLysS, and BL21-CodonPlus(DE3)-RIL. The recombinant proteins containing a His-tag at C-terminus of WSSV189 (rWSSV189) and WSSV471 (rWSSV471) were successfully expressed in E. coli strain BL21-CodonPlus(DE3)-RIL. The rWSSV189 (26 kDa) and rWSSV471 (20 kDa) were purified through Ni mediated affinity chromatography and checked by SDS-PAGE and Western blot analysis. In vitro pull-down assay using rWSSV189 and rWSSV471 as baits confirmed the true interaction between ALFPm3 with both WSSV proteins. To our knowledge, the specific binding of ALFPm3 to WSSV189 and WSSV471 might involve in anti-WSSV activity of ALFPm3.
DOI: 10.14457/cu.the.2011.232
title: Synthesis of positively-charged poly(lactic acid)

description: In order to increase the hydrophilicity of biodegradable poly(L-lactic acid) (PLLA), PLLA with a terminal positively-charged ammonium ion (p-PLLA) was synthesized. PLLA with M ̅n of 3,500 Da was reacted with glycidyl trimethyl ammonium chloride (GTMAC) to obtain up to 76% of substitution on the PLLA chain end. It was also confirmed that the attachment occurred mostly on the carboxyl chain end side. The degree of substitution was determined by 1H-NMR spectroscopy. Hydrophilic property of the polymer was analyzed by measuring air-water contact angle of the modified PLLA films and it was found that the contact angles of p-PLLA (45°) was lower than that of the neat PLLA (57°). No significant change in the thermal properties when PLLA was transformed to p-PLLA as analyzed by DSC and TGA since PLLA was modified only at chain end position.
DOI: 10.14457/cu.the.2011.233
title: Preparation of diesters using acidic mesoporous catalysts

description: SBA-15 and FSM-16 catalysts, which contained propyl sulfonic, aryl sulfonic or aluminium, were synthesized by hydrothermal method. The synthesized materials were characterized by X-ray powder diffraction, nitrogen sorption analysis, scanning electron microscopy, sulfur elemental analysis and ammonia temperature programmed desorption techniques. When comparison between synthetic catalysts, the FSM-16-PrSO3H was the best efficient catalyst. Catalytic performances of FSM-16-PrSO3H were studied via estrification of adipic acid with 2-ethyl hexanol. The optimum condition on lubricating oil additive preparation was carried out over catalyst amount of 3%wt. of the reaction mixture at 100 oC for 5 hrs. with stirring speed 150 rpm. and molar ratio of alcohol to carboxylic acid as 2. The reaction mixtures exhibited highest 2-ethyl hexyl adipate esters yield as 96.2% with 86.0% of diester and 14.0% of monoester selectivities. An increasing in the 2-ethyl hexanol to adipic acid molar ratio resulted in an improvement of the diester yield and selectivity. The molecular size of diacid was significantly affected, when the number of carbon in the linear alkyl chain of dicarboxylic acid was increased, the diester yield and the diester selectivity were decreased due to the enhacement of steric effect. The FSM-16-PrSO3H was used for two times to examine its reusability. It was indicated that the catalyst can be reused without losing catalytic activity when using hexane as washing agent.
DOI: 10.14457/cu.the.2011.234
title: Separation of alkylphenols by gas chromatography

description: The single-run separation of the mixture of twenty-two C0-C3 alkylphenols was investigated by capillary gas chromatography using polysiloxane (OV-1701) and three derivatized cyclodextrins as stationary phases. These derivatized cyclodextrins were hexakis(2,3-di-O-methyl-6-O-tert-butyldimethylsilyl)-α-cyclodextrin (ASiMe), heptakis(2,3-di-O-methyl-6-O-tert-butyldimethylsilyl)-β-cyclodextrin (BSiMe) and octakis(2,3-di-O-methyl-6-O-tert-butyldimethylsilyl)-y-cyclodextrin (GSiMe). The result showed that the separation of 2,4-dimethylphenol from 2,5-dimethylphenol was not achieved on OV-1701 column. When derivatized cyclodextrins were used as stationary phases, the best single-run separation was achieved on BSiMe column using a column temperature of 120 ºC for 11 min and then programmed from 120-180 ºC at 25 ºC/min. The mixture could be separated in 13 minutes. In addition, chromatograms showed acceptable peak shapes without any prior derivatization. Thermodynamic parameters described the interaction between analytes and the stationary phases were also determined. The interactions of analytes on column that contains cyclodextrin derivatives were in the order of GSiMe &lt; ASiMe &lt; BSiMe, respectively, and were stronger than on OV-1701 column.
DOI: 10.14457/cu.the.2011.235
title: Electrochemical detection of ferulic acid by lab-on-paper

description: In this work, lab-on-paper coupled with sensitive electrochemical and simple colorimetric detection was developed to simultaneously determine ferulic acid and total antioxidant capacity. Photolithography was used to create the hydrophilic channels on filter paper. An electrochemical sensor for the determination of ferulic acid was fabricated using screen-printing technology. The quantity of ferulic acid was measured by differential pulse voltammetry. Under optimal conditions, the oxidation peak current showed a good linearity dependent on the concentration of ferulic acid in the range of 3140 ppm with a correlation coefficient of 0.9994. The limit of detection (LOD) of the proposed method was found to be 1 ppm. This presented method was successfully applied for the determination of ferulic acid in corn cider samples. The recovery of ferulic acid ranged from 96.85 % to 103.20 %. Furthermore, the colorimetric detection was successfully employed by the Folin-Ciocalteau reagent to concurrently quantify the total antioxidant capacity. The results in their color change at the detection zone can be determined by monitoring with the digital camera method. This developed method produced results in good agreement with the standard detection methods: HPLC-UV for ferulic acid and UV-vis spectrophotometry for total antioxidant capacity. Therefore, this method can be used for simple, rapid, inexpensive and sensitive dual and simultaneous quantification of ferulic acid and total antioxidant capacity in a variety of samples.
DOI: 10.14457/cu.the.2011.236
title: Free fatty acid esterification using acidic heterogeneous catalyst in continuous packed bed reactor

description: Bentonite clay was treated with 0.5 M H2SO4 by ion-exchange method. The treated bentonite was characterized by x-ray fluorescence spectroscopy (XRF), x-ray powder diffraction (XRD), infrared spectroscopy (IR), scanning electron microscopy (SEM), N2 adsorption-desorption and thermogravimetric analysis (TGA). Esterification of 15 wt% oleic acid in refined palm oil with alcohol was treated over bentonite as catalyst in a continuous packed bed reactor. The various reaction conditions such as mole ratio of oleic acid to alcohol, amount of initial free fatty acid, catalyst height and reaction temperature were studied. The optimum condition of oleic acid was performed under mole ratio of alcohol to oleic acid as 54, catalytic height 25 cm (13.5 g) at 60°C in one column experiment. The highest FFA conversion was obtained at 92.6% and 94.9% for methanol and ethanol, respectively. Meanwhile, the highest FFA conversions were 78.3% and 86.6% for Jatropha curcas oil esterification with methanol and ethanol, respectively. When ethanol was used, FFA conversion was higher than methanol due to increasing solubility between oil and alcohol. The catalytic activity of reused catalyst was decreased due to acid leaching and decomposition of montmorillonite structure.
DOI: 10.14457/cu.the.2011.237
title: Preparation of titanium dioxide fibers as stationary phase in thin layer chromatography

description: In this study, the electrospun fibrous titania were prepared via sol-gel process of titanium tetraisopropoxide and fabricated with electrospinning method. The electrospinning factors that affect the fibers morphology were studied. The electric potential, the distance between a needle and a collector, and the flow rate of the solution influenced the fiber size. At higher PVP:TiO2 ratio, the fiber diameter, the specific surface area and the pore size decreased. When calcination temperature was increased, fiber diameter and specific surface area decreased while the pore size increased and led to transformation of the titania from anatase to rutile. The electrospun fibrous titania had the average diameter range of 50-190 nm and the specific surface area of 2-34 m2/g. The electrospun fibrous titania was used as stationary phase in thin layer chromatography for separation of basic dye compounds which were methyl violet, methylene blue hydrate, and congo red, and compared with particulate silica stationary phase. The efficiency of dye separation using the electrospun fibrous titania TLC was better than the particulate silica TLC. In analysis at basic condition, retardation factors of positively charged methyl violet and methylene blue hydrate, on the electrospun fibrous titania TLC were higher than those on the particulate silica TLC. While retardation factor of negatively charged congo red, on the electrospun fibrous titania TLC was lower than that on the particulate silica TLC. In addition, the analysis time of the electrospun fibrous titania TLC was shorter than that of the particulate silica TLC.
DOI: 10.14457/cu.the.2011.238
title: Chemical constituents and free radical scavenging activity of bee pollen of apis mellifera from nan province, Thailand

description: Bee pollen is one of honeybee products. It is collected by foragers of Apis spp. and some species of stingless bees. It is the mixture of natural flower pollens, nectar, and secretion of bees. It is rich in nutrients such as sugars, proteins, lipids, vitamins, flavonoids, etc. It was reported that bee pollens provided various bioactivities such as antiproliferative, anti-allergenic, anti-angiogenic, and free radical scavenging activities, etc. In this research, it was aimed to investigate chemical constituents and to determine the free radical scavenging activity of bee pollen extracts. Bee pollens were directly collected from A. mellifera colonies in Chedeechai subdistrict, Pua district, Nan province, Thailand, in June, 2010. During that period, the majority of cultivated crops surrounding an apiary were corn. Crude bee pollen was extracted by EtOH and was partitioned by different solvents (hexane, CH2Cl2, and MeOH). Later, they were tested for free radical scavenging activity by DPPH assay. The absorbance was measured at 517 nm. The percentage of scavenging activity and effective concentration at 50% (EC50) were estimated. Crude CH2Cl2 extract originated from EtOH extract providing the most active free radical scavenging activity has the EC50 value of 7.47 ± 0.12 µg/ml. This crude was purified by quick column, size exclusion chromatography, and adsorption chromatography. The purity of all fractions in each step was observed by thin layer chromatography (TLC). Finally, chemical constituents in the most active fraction was analysed by nuclear magnetic resonance (NMR). Two compound structures were revealed. The first compound, a minor compound, was hydroquinone belonging in a phenolic compound group. The second compound, a major compound, was apigenin belonging to a flavone group. The properties of bee pollen were tested in term of total disaccharide sugar, reducing sugar, total phenolics, and total flavonoid contents. It could be concluded that not only bee pollens from Nan province in Thailand were nutritional, but it also had the free radical scavenging activity.
DOI: 10.14457/cu.the.2011.239
title: The determinants and finance consequence of balanced scorecard implement : the case of listed companies in Thailand

description: The objectives of this study are threefold: (1) to explore the BSC application among firms listed on the Stock Exchange of Thailand (SET) and the Market for Alternative Investments (MAI) by employing a developed framework of Balanced Scorecard (BSC) stage classification considering BSC attributes embedded in firms' performance measurement systems, (2) to study the determinants that influence firms' reaching higher stages of BSC application, and (3) to study the fianancial consequence of BSC implementation. This study obtains both primary and secondary data from questionnaires sent to CFO's of the listed firms and from SET Market Analysis and Reporting Tool (SETSMART), respectively. The statical techniques employed in this study include logistic regression analysis for cross-sectional data. The data anaklyses are based on 0.10 significance level. Based on 73 useable survered respondents, it is found that the proportions of BSC-adopted and BSC-implemented firms are 26%, respectively. The determinant study finds that the external factor (environment uncertainty), the structural factors (participation, formalization, interconnectedness and information system) and the attitudinal factor (attitude toward BSC) are positively associated with the extent to which firms reach higher stages of BSC application. The structural factors also found to be indirectly associated with raching higher states of BSC application through the attitudinal factor. Futhermore, it is found that the executional factors (top management support, CFO's involvement, team and training) are directly associated with the extent to which firms reach the implementation stage of BSC application and indirecly through the attitudinal factor. Regarding the study of the financial consequence of BSC implementation in terms of return on equity (ROE) improvement, the results support the notion that firm with the BSC implemnetation are likely to have higher (ROE improvement than those at the lower level of BSC application.
DOI: 10.14457/cu.the.2011.240
title: Preparation of polyol esters using acidic heterogeneous catalysts

description: The sulfonic functionalized SBA-15, SBA-15-PrSO3H, was prepared by hydrothermal method and post-grafting synthesis. The synthesized materials were characterized by X-ray powder diffraction, nitrogen sorption analysis and scanning electron microscopy. The synthesized catalyst was studied its performance comparing to several heterogeneous catalysts in the esterification of neopentyl glycol and octanoic acid which was firstly optimized the suitable condition using Amberlyst-15 as a catalyst. The synthesized material performed the best efficient catalyst which could reduce reaction time from 4 to 2 hours. Thus, the optimal condition performed at 80 oC for 2 hours with stirring speed 200 rpm using 3 wt. % of SBA-15-PrSO3H based on total reaction weight in stainless steel batch reactor which gave high total ester yield as 74.1% and 76.9% of NPG dioctanoate ester selectivity in order to using the octanoic acid to neopentyl glycol mole ratio as 2. Moreover, the reaction mixtures exhibited highest NPG dioctanoate ester selectivity as 89.1% with 78.1% of total ester yield in case the octanoic acid to neopentyl glycol mole ratio increased to 4. Additionally, the esterification with difference molecular size of monocarboxylic acid and alcohol type significantly affected to the total ester yield and diester selectivity due to the difference requirement of energy. For reusability test, the SBA-15-PrSO3H was used two times to examine its reusability. It was indicated that the hexane washed catalyst obtained the best performance in reusability experiment. Moreover, the catalyst regeneration could improve its reactivity
DOI: 10.14457/cu.the.2011.241
title: Enantimeric separation of epxides by gas chromatography using derivatized alpha-cyclodextrins as stationary phases

description: Enantiomeric separations of 42 aromatic epoxides and 6 aliphatic epoxides were studied by means of capillary gas chromatography using derivatized α-cyclodextrins: hexakis(2,3-di-O-methyl-6-O-tert-butyldimethylsilyl)cyclomaltohexaose (or ASiMe) and hexakis(2,3-di-O-acetyl-6-O-tert-butyldimethylsilyl)cyclomaltohexaose (or ASiAc) as chiral stationary phases. The effects of substitution types, number and position of epoxides on retention and enantioselectivity have been investigated. The results showed that all epoxides were successfully separated with either ASiMe or ASiAc or both columns, except benzyl glycidyl ether (8) and 1,2-epoxydodecane (dodec). ASiMe column could enantioseparate 41 analytes while ASiAc column could resolve only 16 analytes. Aromatic epoxides were better separated on ASiMe column. Furthermore, the position and type of substituent on aromatic ring of styrene oxide played important roles on enantioseparation. Thermodynamic data were acquired to clarify the interaction strength between analyte and stationary phase as well as the enantioselectivity towards the selected groups of epoxides.
DOI: 10.7910/dvn/vrwojf/3yzgle
title: Jeehp_16_22_raw data_dataset 1.tab

description: :unav
DOI: 10.7910/dvn/vrwojf/lbddqy
title: Jeehp_16_22_raw data_dataset 3.tab

description: :unav
DOI: 10.7910/dvn/vrwojf/xyby9v
title: Jeehp_16_22_raw data_dataset 2.tab

description: :unav
DOI: 10.18112/openneuro.ds002157.v1.0.1
title: T1-weighted structural MRI study of cannabis users at baseline and 3 years follow up
DOI: 10.14457/cu.the.2011.242
title: Direct synthesis of lactide from lactic acid

description: L-lactide was directly synthesized from L-lactic acid solution through 3 methods. In the first method, L-lactide was synthesized under steam distillation, but could not be isolated via steam distillation. Addition of toluene did not improve the process. The highest yield of L-lactide from this method was 3 %. In the second method, silica gel was used as dehydrating catalyst. The extraction with boiling solvent and baking L-lactic acid with silica gel were investigated. The highest yield of lactide was 9 % when 1:1 ratio of L-lactic acid and silica gel were boiled in toluene at reflux for 12 hours. In the third method, L-lactide was synthesized and isolated via the reduced pressure distillation in the presence of acid or metal catalyst. Magnesium sulfate was found to be the most effective catalyst for L-lactide production, giving pure product in 20 % yield at distillation temperature of 180-200 °C for 1 h. This simple method enables the production of L-lactide without numerous subsequent separation and purification steps.