cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2006.2099
title: Molecular cloning and expression of Green pit viper (Trimeresurus albolabris) serine protease

description: Viper is common snake family for venomous snakebites in Thailand. The venom destroys maining blood coagulation. Green pit viper (Trimeresurus albolabris) is the most common in Bangkok and boundary that have problem in medical and security. T albolabris venums are many kind proteins that have potential in blood coagulation. Serine protease have effect to thrombin clotting, plasminogen activator, fibrinogenolysis, anticoagulant agent and corrected anticoagulant. The study results of nucleic acid and amino acid from T albolerine primary cDNA library. Serine protease digest fibrinogen (albofibrase) that dase not full-length sequence. Using 5 ́-RACE method, the full length sequece of albofibrase was derived. Lbofibrase from Pichia pastoris was purified using affinity chromatography. The yield of albofibrase was 0.658 mg/liter of culture medium with molecular weight of approximately 30 kDa. Albofibrase could activate plasminogen (plasminogen activator albofibrase). Albofibrase have been thrombin clotting time at 0.058 unit thrombin. Albofibrase could digest fibrinogen at Aα-chain (fibrinogenolysis) and 180 minutes time incubation. Albofibrase could inhibit blood coagulation (anti-coagulant agent), so prolong of prothrmbin time (PT) and activated partial thromboplastin time (aPTT). Albofibrase could corrected time to normal PT and aPTT by green pit viper serum (corrected anti-coagulant). Suggesting that defibrination syndrome in patients is a combination of these enzymatic effects. Albofibrase is a novel serine protease has potentials to be therapeutic anti-thrombotic agent, fibrinogenolysis agent and anti-coagulant agent in the future.
DOI: 10.14457/cu.the.2006.2100
title: Pretreatment of silk fabric surface with with amino compounds for inkjet printing

description: This research studied the pretreatment of silk fabric with amino compounds for ink jet printing. The pretreatment is expected to increase smoothness of the fabric surface. The pretreating solutions were serine, glycine, aspartic acid, sericin, chitosan, and Sanfix 555. The non-treated and treated fabrics were printed with the in-house formulated, pigmented inks and later steamed to fix the ink on the fabric surface. The inks had a pH in the range of 8 – 9 and exhibited the Newtonian flow in which the viscosity remained constant at 2.5 mPa s. The surface tension of the inks was approximately 44 mN m⁻¹, and the average particle sizes were approximately 100 nm. Zeta-potential of the inks was in the range from (-42) to (-51) mV. The inks were stable for at least 10 months (for the magenta and black inks) and a year (for the cyan and yellow inks) confirmed by micrographs of SEM and TEM. The inks prepared were suited for printing with the piezo type ink jet printer. It was concluded that the pretreatments containing the amino compounds improved hydrophilicity of the silk fabric except chitosan. The color gamuts from the sericin, chitosan, and Sanfix 555 pretreatments were wider than those from the amino acid pretreatments. The chroma of the cyan color was the most improved. The fabric after the pretreatment with the sericin showed a significant improvement in the dry crock fastness while the wet crock fastness was improved by serine and glycine. The chitosan slightly improved both dry and wet crock fastness. Wash fastness of the printed fabrics was excellent. The stiffness of the silk fabrics obtained from the chitosan pretreatment was significantly higher than other pretreatments which were similar to the non-treated one. The coated chitosan compacted the fibers to a bundle of yarns and gave a wider inter-yarn space. Thus, the fabric treated with chitosan yielded a higher air permeability. The ink penetration in sericin and chitosan coated layers was shorter than those of amino acids, enhancing ink deposition on the fabric surface. Some mentioned amino compounds from the pretreatments could hold and fix additional inks on the fabric surfaces, resulting in a wider color gamut of the inks. Department Imaging and Printing Technology
DOI: 10.14457/cu.the.2006.2101
title: Biofiltration of xylene vapor by selected microorganisms

description: Biofiltration of an air stream containing xylene vapor has been studied in a laboratory. The experimental study consisted of two parts. In the first part, xylene-degrading microorganisms were isolated from biofiltration system and performance study of selected microorganisms was completed in the second part. The biofilter column was 5.0 cm diameter and 200 cm long with gas sampling ports. For the first part, the biofilter medium in the experiment consisted of coconut husk 75%, manure compost 20% and wastewater sludge 5% v/v. Xylene-degrading microorganisms were isolated from the biofilter, which operated under a continuous loading of xylene vapor 8 h/day for 1 and 2 months. Four dominant species of xylene-degrading fungi in biofilter were identified. These dominant species were identified by phenotype and DNA sequencing techniques as Aspergillus flavus (M1), Aspergillus terreus (M2), Penicillium glabrum (M3) and Aspergillus niger (M4). For the second part, three microorganisms (M1, M2 and M3) were selected to individually inoculate biofilters for a performance study using a sterilized biofilter medium consisting of coconut husk and manure at a ratio of 70:30 v/v. Biofiltration of xylene vapor was carried out for 95 days at various concentrations and flow rate conditions. The initial moisture content of the biofilter medium was adjusted to 50% of dry weight. The pressure drop across the bed was 0.25 – 1 cm of H₂O. The pH and temperature were 5.5 to 8.5 and 28 – 33℃, respectively. The various inlet xylene concentrations (0.01 – 6.3 g.m⁻³) were tested with empty bed retention times of 705 s, 280 s and 140 s. The maximum elimination capacities of M1 and M2 (88 and 91 gm⁻³h⁻¹ respectively) were nearly the same, whereas M3 showed a better performance (115 gm⁻³h⁻¹).
DOI: 10.14457/cu.the.2006.2102
title: The effects of error treatments and students' language abilities on the usage of English tenses through the use of computer-assisted language learning

description: This study investigated the effects of different error treatments-overt correction (OC) and self-correction (SC)-on the usage of English tenses of Thai undergraduate students. Both treatments were given through CALL. Language abilities of the students-high, moderate, and low achievers-served as a moderator variable. The study was conducted with 210 first-year undergraduates of Huachiew Chalermprakiet University in a 2x3 factorial design. At the commencement of the study, all subjects were pre-tested by using the Test of English Tenses Usage (TETU) developed by the researcher. After they completed 9 CALL lessons in 3 weeks, the posttest was conducted. Two-way analysis of Variance (ANOVA) and descriptive statistics were used to analyze and to explain the data. Six weeks after the posttest, the delayed test was administered to investigate the retention of both treatments. The data was then analyzed by two-way repeated measures ANOVA. Results from the immediate posttest showed that the error treatment factor did not have a significant effect on the usage of tenses, while the language ability factor did. An interaction effect between the error treatments and the language abilities was not found. Results from the self-rating scales revealed that students in both treatment groups rated that they knew about the tenses much more than they did before practicing with the program. However, comparison of their ratings across treatment groups did not yield a significant result. Regarding the differences of English tenses used by different ability groups, it was found the two prominent tenses that the low group could perform were present continuous and simple present; the moderate ability group, in addition to these two tenses, could do the future tenses. The high ability group could master almost all tenses; the two tenses that were found to be the most difficult for this group were past perfect and present perfect. Results from the delayed test revealed that the self-correction group had significantly higher retention than the overt correction group did. Additional findings from the opinionnaire also confirmed that the SC group rated the materials significantly higher than the OC group in terms of the usefulness of the feedback.
DOI: 10.14457/cu.the.2006.2104
title: Effect of mica on water absorption of acrylamide-itaconic acid superabsorbent nanocomposites

description: The superabsorbent polymer and its nanocomposite of acrylamide (AM)/itaconic acid (IA) were synthesized by solution polymerization in the aqueous solution of AM with IA as a comonomer and mica used as an inorganic additive in the polymerization process. This reaction was initiated by an initiator couple of ammonium persulfate and N N, N′, N′- tetramethylethylenediamine (TEMED). The N, N′-methylenebisacrylamide crosslinker was used in the polymerization. The influences of the concentrations of IA, crosslinker, mica content, and reaction temperature on the water absorption of the superabsorbent polymer systems were examined. In addition, the effects of the mica content on water absorbency under load of the synthesized copolymers and composites at 0.28 and 0.70 psi were examined. The water absorbency of the synthesized copolymers in artificial urine was also investigated. The functional groups of synthesized copolymers and composites were investigated by Fourier Transform Infrared Spectroscopy, and thermal properties were characterized by thermal gravimetric analysis. The structure and surface morphology were investigated by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Moreover, the viscoelastic properties of the swollen gel were investigated. The results showed that the polymer chains intercalated into the silicate layer in the mica and created more network junctions in the polymer structure. The synthesized copolymer gives the highest water absorbency of 640+7 times its dry weight at the AM-to-IA ratio of 95:5 and 5% mica, and can absorb up to 79+3 times its dry weight in artificial urine. The mica addition results in higher water absorption of 748+5 and 76+2 times its dry weight in artificial urine with increased gel strength and enhanced thermal stability of the synthesized superabsorbent nanocomposites. Such composites were obtained from the polymerization condition of AM/IA 95/5, 5% wt of mica, 0.2% mole of N-MBA, 0.3% mole of APS, 1.2% mole of TEMED (0.2 ml) and a reaction temperature of 50°C. This superabsorbent nanocomposite has intercalation layers in mica with increasing gel strength, higher water absorption and thermal stability.
DOI: 10.14457/cu.the.2006.2105
title: Fabric and fiber modification using radio frequency plasma process

description: This thesis focuses on the hydrophobicity improvement of fabrics which included polyethylene terepthalate, Thai silk, mixed Thai silk and cotton using radio frequency inductively coupled SF₆ plasma. All treated fabrics show significant improvement in hydrophobicity. Compared with untreated fabrics, contact angle of treated fabrics increases about three times and absorption time increases from 0-30 minutes to the maximum observation time limit of 210 minutes. The change in surface morphology was observed by scanning electron microscopy and atomic force microscopy. The average roughness increased from 3-28 nm to 23-45 nm, depending on type of fabrics. The changes in chemical compositions on fabric were invertigated by X-ray photoelectron spectroscopy (XPS). The XPS results show the participation of fluorine-containing groups (CF, CF₂, CF₃) in fabric surface as well as the increase of total fluorine content after SF plasma treatment. The fluorine content were related to the absorption time. We found that the main reason for the improvement of hydrophobicity properties of fabrics should due to the incorporation of fluorine atoms rather than the increase of surface roughness. In this study, the increase of surface roughness was found to be in the order of nanometer range which is very small compared to the size of water droplet used in the experiment. In our RF-ICP system, the optimum operating plasma condition is obtained at pressure of 0.5 Torr and RF power of 50 watts.
DOI: 10.14457/cu.the.2006.2106
title: Synthesis and performance of acrylamide-based aluminium flocculant

description: Polymeric flocculants of aluminium hydroxide-poly[acrylamide-co-(acrylic acid)], AHAMAA, were synthesized by solution crosslinking polymerization using aluminium hydroxide as a coagulant in the presence of acrylamide and acrylic acid as a comonomer pair, N, N’- methylenebisacrylamide (N-MBA) crosslink agent, ammonium persulphate (APS) and N, N, N’, N’-tetramethylethylenediamine (TEMED) as an initiator and co-initiator pair, respectively. The reaction was stirred with a stirring speed of 250 rpm at 40-50℃ for 1 h. The reaction products were dewatered by precipitation with acetone, dried in an oven at 50℃ for 24 h and milled. The water absorbency, the direct dye removal efficiency and the turbidity reduction of a synthetic wastewater of suspending kaolin with a variety of poly[AM-co-(AA)] and AHAMAA were investigated. From the results, it was found that the water absorbency of poly[AM-co-(AA)] is always higher than AHAMAA for all synthesized polymers. The water absorbency can be related to the storage modulus of the polymers. The storage modulus of AHAMAA is higher than that of poly[AM-co-(AA)], in good agreement with its lower absorbency. The efficiency of Congo red removal by AHAMAA is better than that of poly[AM-co-(AA)] synthesized by 4x10⁻³, 2.3x10⁻⁴, 1.6x10⁻⁴ and 12x10⁻⁴ mol of the acrylic acid, crosslinking agent, initiator, and co-initiator, respectively. The AHAMAA can remove Congo red which obeys the Freundlich adsorption isotherm, whereas poly[AM-co-(AA)] can adsorb Congo red by the transportation of dye molecules into its hydrogel porous structure. In the case of direct blue 71, all the synthesized AHAMAAs can remove the dye and obey the Freundlich isotherm whereas poly[AM-co-(AA)] cannot remove it. The AHAMAA is far more effective to reduce turbidity of the kaolin suspending wastewater than poly[AM-co- (AA)].
DOI: 10.14457/cu.the.2006.2107
title: Lubricating oil for fluid dynamic bearing in 2.5 inch hard disk drive motor

description: In this research, lubricating oil was developed for fluid dynamic bearing (FDB) that can be used in 2.5 inch HDD. The characteristics of base oils that effect on the potential usage of lubricant in fluid dynamic bearing for 2.5 inch HDD were studied. The preparation of base oil samples and properties assessment were performed. Finally, finished lubricants were improved and their properties were assessed such as flash point, outgas, friction coefficient and service life test. The results showed that finished lubricant which could be used in FDB spindle motor of 2.5 inch HDD can be prepared from a mixture of base oils prepared from DOS and DOA (1:1) and then blended with antioxidant additive, antiwear additive and metal deactivator additive at 2%, 1% and 0.05% w/w, respectively. This finished lubricant has kinematic viscosity at 9.67 mm²/s at 40℃, wear scar at 0.31 mm., % weight loss at 0.289 (85℃ x 3 hrs.), outgas at 1,394 ng/g (85℃x 3 hrs.) and friction coefficient by SRV at 0.097 (50℃), Moreover, it has excellent long service life and weight loss properties which are better than those of commercial available lubricant.
DOI: 10.14457/cu.the.2006.2108
title: Effects of titanium cation substitution on piezoelectric properties of bismuth sodium lanthanum titanate system

description: The Bi₀.₅Na₀.₄₈₅La₀.₀₀₅TiO₃ (BNLT) compositions were modified by substituing with cations such as Zr⁴⁺, Nb⁵⁺ and Fe³⁺ ions at Ti-sites to improve piezoelectric properties. The conventionally mixed oxide method was utilized for powder preparation. The measured densities of sintered pellets (for Zr-BNLT and Fe-BNLT) were higher than 95% of theoretical densities. The lattice constants of Zr-BNLT and Nb-BNLT pellets increased with an increase in the amount of substituents. On the contrary, with an increase in the Fe content in the BNLT system, the lattice constant of Fe-BNLT pellet decreased. It was found that the higher Fe content (2.5 at%) in the BNLT system caused large grain size (up to 4.23 micron). Moreover an increase in the Fe content favored low phase transition temperature detected by DSC technique. The remanent polarizations of Zr-BNLT and Fe-BNLT pellets decreased with an increase in the amount of substituents. The remanent polarization of Zr-BNLT, Nb-BNLT and Fe-BNLT were 1.9, 20 and 7.9 μc/cm², respectively. Due to high electrical conductivity of the Zr-modified BNLT system, the optimum poling condition could not be achieved. The modified-BNLT with an addition of 1.0 at% Fe provided a piezoelectric coefficient (d₃₃) of 155 pC/N and the planar (k[subscript p]) and thickness (k[subscript t]) electromechanical coupling factor of 16.6% and 46%, respectively.
DOI: 10.14457/cu.the.2006.2109
title: Partial purification and characterization of polyethylene glycol/polylene glycol-degrading enzymes from Pseudomonas sp. PE-2

description: Polyethylene glycol (PEG) and polypropylene glycol (PPG) have been widely used as raw materials for many industries. Consequently, they are released into wastewater system and environment. Their biodegradation have been studied in Pseudomonas sp. PE-2. Polyethylene glycol dehydrogenase (PEG-DH) and polypropylene glycol dehydrogenase (PPG-DH) activities were found in cell-free extract of Pseudomonas sp. PE-2. Both enzymes were inducible when PEGs and PPGs served as a sole carbon and energy sources. In the late phase of logarithmic growth, most of the PEG-DH activities (76.6%) were found in the periplasm, while PPG-DH activities (82%) were in the cytoplasm. The PEG-DH and PPG-DH in cell-free extract were partially purified by ammonium sulfate precipitation, anion-exchange column and hydrophobic column to 11.8 and 51.4 fold, respectively. The partially purified PEG-DH is a monomer of 73.6 kDa. PPG-DH appeared to consist of two identical subunits of 36 kDa. The optimum pH and temperature of the PEG-DH and PPG-DH were at pH 9.0, 25°C and pH 7.5, 25°C, respectively. The partially purified PEG-DH and PPG-DH were stable in the pH range of 8.0 to 9.5 and 7.0 to 8.0, respectively. Moreover, both enzymes were stable below 30°C and had pyrroloquinoline quinone (PQQ) as cofactor. The metal ions at 2 mM inhibited the PEG-DH and PPG-DH activities by 8-100% and 5-30%, respectively, while Ni²⁺ could enhance the PPG-DH activity by 38%. The enzymes oxidized various kinds of PEGs and PPGs, among which, PEG 600 and PPG 725 were the most active substrates for PEG-DH and PPG-DH, respectively. The apparent K[subscript m] values of PEG-DH for PEG 600, PEG 2000, PEG 4000, PEG 6000 and PEG 8000 were 0.7, 3.3, 4.6, 30.5 and 28.3 mM, respectively, whereas those of PPG-DH for PPG 725, PPG 1000 and PPG 2000 were 5.1, 4.6 and 12.6 mM, respectively.
DOI: 10.14457/cu.the.2006.2110
title: Efficiency, Quality and Equity of hospital service under multiple health insurance payment environment

description: The purposes of this study were to assess the impacts of insurance payment methods on quality, equity and efficiency of health care services. Electronic database and hard copy of medical records from three public hospitals during 2003-2005 fiscal years were used in the assessment. Acute low back pain, acute upper gastrointestinal bleeding (AUGIB), epilepsy and lung cancer were employed as tracer diseases. Chi- square was used to assess the effects of payment methods on access to care and quality dimension of practice patterns. Shorrocks index was applied to measure inequality of drug cost of treatment in each tracer disease. Cost-effectiveness technique was used to assess impacts of payment methods on efficiency of health care services. It was found that new drugs, drugs in dosage form with high technology and high cost equipment were prescribed to patients using open-ended payment method in statically significant higher percentage than for patients covered by close-ended payment system. However, there was no difference in the access to required drugs, to supportive drugs and to gastroscope among patients with any insurance systems. Furthermore, there was no significant associate between the payment methods and the adherence to the critical recommendations of standard practice guidelines. By contrast, fewer open-ended paying epileptic patients suffered ADRs and received better management than those in insurance scheme using close-ended payment method. Shorrocks index on the cost of drug treatment indicated inequality among patients with different payment schemes. Better efficiency was found in the treatment of epilepsy for service in open-ended payment scheme, and in the treatment of UGIB and lung cancer in close-ended schemes. Evidence form this study indicates that payment methods have impacts on access to high cost services with drugs appear to be the first target of cost control.
DOI: 10.14457/cu.the.2006.2111
title: Selection criteria for wells suitable for electrical submersible pump (ESP) in the gulf of Thailand

description: The research conducted will achieve criteria by which the candidate ESP wells will be selected and these criteria which will be developed by running reservoir simulation for different types of reservoir behavior. The potential ESP candidate wells will need to perform better by ESP as comparative to the gas lift and simulation runs will be made in order to observe these performances. The field has very limited gas availability for injection and hence the contrast needs to be set between gas lift and the Esp. To reach the conclusions sensitivities such as solution GOR, artificial life setting depth, relative permeability and injection rate will be varied to see their effects on the cumulative oil recovered by each artificial lift. The results will be used to construct a surface response using design of experiments which will help us see a broader picture of the trend and hence we can maximize efficiency by choosing the wells that deserve using ESP than gas lift based on the qualities it posses.
DOI: 10.14457/cu.the.2006.2112
title: Polyaniline blended with polyvinyl alcohol for ammonia sensing

description: Conducting polyaniline (PAni) was one of the important materials as an ammonia gas sensor. In this work, chemically synthesized and blended polyaniline-polyvinyl alcohol films (PAni-PVA blended film) were prepared for ammonia sensing. Blended PAni-PVA showed a lot of promise in terms of fabrication In addition, conductivity and stability of the blended film were improved by doping PAni and cross-linking PVA with citric acid. FT-IR spectra and SEM micrograph illustrated a good conducting ability and excellent morphology of this film. The conductance of the film increased when exposed to ammonia gas. The conductance of PAni-PVA blended films on an exposure to 90 ppm of ammonia gas was ranging from 19 to 340 nS depending on the amount of citric acid doped. Among those, PAni-PVA blended film with 4% w/v citric acid gave the most excellent ammonia sensing in term of conductance changing and responding time. Film thickness as well as operating temperature and humidity also influenced the sensing of PAni-PVA blended film. The optimized condition was using a 0.15 – 0.20 mm film thickness operating at room temperature (30๐C) and 60%RH. This film The ammonia sensing of this film was reversible. The response and recovery time were 10 and 20 minutes, respectively. The responses of repeated sensing of ammonia gas were reproducible up to 9 cycles. In the presence of 10 to 100 ppm of ammonia gas, the changes of conductivity were well related to the concentration of ammonia gas.