cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2015.467
title: Development of Sr2FeMoO6-delta perovskite for solid oxide fuel cell

description: Double perovskites, Sr2FeMoO6 (SFMO), Sr2FeMo1-xCoxO6, Sr2FeMo1-xNixO6, Sr2Fe1-xCoxMoO6, Sr2Fe1-xNixMoO6, Sr2-xLaxFeMo0.5Co0.5O6, Sr2-xPrxFeMo0.5Co0.5O6, Sr2-xLaxFeMo0.5Ni0.5O6 and Sr2-xPrxFeMo0.5Ni0.5O6, have been investigated as anode materials for intermediate-temperature solid oxide fuel cell (IT-SOFC, 600-800ºC). All materials synthesized in air by a conventional solid-state reaction with calcination and sintering temperatures of 1000ºC and 1300ºC for 12 hours, respectively, showed the double-perovskite structure as a major phase and SrMoO4 as a minor phase impurity. The incorporation of Co and Ni into the Mo-site of SFMO structure resulted in the increasing of electrical conductivity of SFMCox and SFMNix. Among the various oxides examined, SFMCo0.5 and SFMNi0.5 showed the highest electrical conductivity of 32.93 and 50.11 S·cm-1 at 800ºC and 600ºC, respectively. Moreover, a trace amount of Co and Ni inserted in the Fe-site led to the increase in the electrical conductivity of SFCoxM and SFNixM as x = 0.1 and became decreasing when x = 0.2. The configuration of single fuel cells of Co-, Ni-doped SFMO/ La0.9Sr0.1Ga0.8Mg0.2O3/ Sr0.5Sm0.5CoO3 was fabricated and the highest power density of 802, 723, 823 and 834 mW·cm-2 at 800ºC was achieved from the cells using SFMCo0.2, SFMNi0.1, SFCo0.1M and SFNi0.1M as anodes, respectively. On the contrary, the conducting properties of SFMCo0.5 and SFMNi0.5 were not achieved by the introduction of La and Pr at Sr-site.
DOI: 10.14457/cu.the.2015.468
title: Formula for a correlation coefficient between underlying commodity price and its convenience yield under Schwartz model

description: Commodity is a marketable item usually use as inputs in productions of other goods such as crude oil, agricultural good, gold, etc. The price of commodity for each country usually depends on demand and supply of people in that country. However, there is a factor that effects the commodity price in economic called convenience yield, which is used to describe the benefit of holding a physical good, rather than the derivative product. The theory of storage tells us that the convenience yield varies inversely with the inventory of commodity. Since commodity price depend on level of the inventory, finding the covariance between commodity price and convenience yield can imply the inventory of commodity, which is an important factor for government to make policies and decisions in commodity price. This thesis offers a formula for a correlation coefficient between underlying commodity price and its convenience yield, which can be used to determine the inventory that is not observable from commodity market.
DOI: 10.14457/cu.the.2015.469
title: Use of spionid polychaetes genus Prionospio in bioremediation of organically enriched sediment under green mussel rafts

description: Spionids, Prionospio spp., in this study were proposed as the potential bioremediators of organically enriched sediment under green mussel rafts in Sriracha Bay, Chonburi Province. Key criteria as bioremediator in selecting the potential Prionospio species were focused. The distribution and abundance of spionid polychaetes in Sriracha Bay revealed that Prionospio (Prionospio) membranacea, dominated of 70% of the spionids found in the area, was widely distributed in the high organic content area in the mussel raft culture area and nearshore station. Prionospio (Minuspio) pulchra, the second most abundant species, also found distributed in high organic content area but in low density. Morphological adaptation of respiratory structure in spionid polychaetes were considered one of the key criteria for selecting potential polychaete species. The present study revealed the presence of intraspecies morphological differences in respiratory structures in spionids as related to different organic conditions. In the high organic content area, branchial pairs were significant longer than those in the area of low organic content. The pinnules were more numerous in the high organic area. In addition, branchial length and pinnule numbers showed the tendency to increase in relation to body size. These morphological differences of these spionids under different organic condition occurred earlier in their early benthic juvenile stage. Reproductive and development pattern in spionid polychaetes in organically enriched sediment is another key criteria for potential bioremediator. The characteristic of reproduction and larval development patterns of the two dominant spionids, P. membranacea and P. pulchra fit the life history of opportunistic species. Organic enriched sediment increased their reproductive potential in term of increase fecundity and decrease time to metamorphosis and settlement. Organic enriched sediment also increased the settlement success in the larvae of these polychaete species. From the bioremediation efficiency assessment, the two spionids, P. membranacea and P. pulchra were efficiently converted the organic waste into biomass and reduced the organic matter in the sediment. From the results of key criteria as bioremediator, P. membranacea was selected as the potential species for the treatment of organically enriched sediment under green mussel rafts in Sriracha Bay, Chonburi Province. The artificially mass culture of selected spionid was efficiently bioremediate the enriched sediment through the process of converting organic waste into biomass and reduced the organic matter and sulphide. High density of P. membranacea increased the bioremediation efficiency.
DOI: 10.14457/cu.the.2015.470
title: Determination of urinary glucose by fluorescence spectroscopy ofcurcumin using fenton reaction

description: This research presents an alternative method to determine glucose level in human urine based on the glucose oxidase reaction and Fenton reaction. Hydrogen peroxide produced in the reaction between glucose oxidase and glucose would react with ferrous ion via Fenton reaction. The products of Fenton reaction including hydroxyl radicals and ferric ions further reacted with curcumin through oxidation reactions and complex formation, respectively. The fluorescence intensity of curcumin decreased with an increase of hydrogen peroxide or glucose concentration. The effects of various parameters were investigated including HCl concentration, reaction time periods, quantity of reagents and time periods for glucose oxidase reaction. Moreover, the urine matrix effect and potential interfering species were also studied. As a result, the urine matrix did not have impact on glucose detection after a 2-fold dilution of urine sample. The time period required in glucose oxidase reaction and Fenton and curcumin reaction were both 30 minutes. By using the proposed condition, the linear range for glucose determination was 0.30-1.40 mM with the limit of detection and quantification of 0.10 and 0.30 mM, respectively. The co-existing species in urine sample did not affect the determination of glucose except ascorbic acid. The tolerant value of ascorbic acid in urine for glucose analysis by the proposed method was 12.5 mg/L. Moreover, the analytical results obtained by using the proposed method in the analysis of urine samples were not significantly different from the results observed by the standard hexokinase glucose-6-phosphate dehydrogenase method. The percent of relative standard deviation of glucose analysis by using the proposed method were found in the range of 0.9-3.9%. The proposed method was successfully applied to detect glucose in human urine samples with acceptable accuracy and precision.
DOI: 10.14457/cu.the.2015.471
title: Petrochemistry and metamorphism of Lansang metamorphic suites, Changwat Tak

description: Western metamorphic belt in Thailand elongated within north-south direction has been grouped into the Chiang Mai-Lincang belt. As part of this metamorphic belt, the Lansang National Park located in the west of Changwat Tak is an affected area from northwest-southeast striking Mae Ping fault. Along the fault zone, rocks have been strongly deformed yielding steep foliation and lineation. Based on petrographic study, these rocks are mainly characterized by gneisses showing very fine- to coarse-grained textures which consist of quartz, plagioclase, K-feldspar, biotite and minor amounts of chlorite and amphibole. Calc-silicate and impure marble are partly interlayered in these gneisses; they are composed of calcite, quartz, feldspar, amphibole and garnet. Moreover, granitic gneiss, intruded into the host gneisses and calc-silicate, appears to have similar composition of gneiss. Based on geothermobarometry, these rocks should have undertaken high-grade metamorphism belonging to upper greenschist to lower amphibolite facies with P-T estimates of 560-580°C and 5.7-7.5 Kbar for coarse-gained gneiss, 545-560°C and 0.5-0.8 Kbar for fine-grained gneiss, 440-500°C and 3.0-5.0 Kbar for very fine-grained gneiss and 480-510°C and 6.0-6.8 Kbar for impure marble. According to geochemistry, these rocks appear to have several evolution stages. Granitic and sedimentary protoliths, initial rocks of gneisses and calc-silicate, may have been situated in the area prior to regional metamorphism. Subsequently, dykes and veins crossed cut into these gneissic and calc-silicate rocks before later metamorphism appears to have continued and reached the ductile-brittle stage along with uplifting onto the surface.
DOI: 10.14457/cu.the.2015.473
title: Synthesis of gold nanosheets and flower-like gold nanostructures

description: In this work, we report a simple and efficient method for the preparation of large gold nanosheets using H2O2 as the green reducing agent and starch as a stabilizer and shape-controlling agent. H2O2 provides a weak reducing capability that allows a kinetically controlled growth of nanosheets out of small flower-like nanostructures formed at the initial stage of particle growth. Small nanosheets with starch-bound {111} facet undergo oriented attachment and become large nanosheets with lateral size as large as 50 µm with the thickness of 20–50 nm. Without starch, gold quasi-microspheres with diameters of 5–10 µm are obtained as the dominant product as they grow out of the flower-like nanostructures by filling gold atoms in the gaps between nano-petals. This starch-enable selective formation of large nanosheets is rapidly and efficiently as a 100% conversion can be attained. Interestingly, micrometer-sized flower-like gold nanostructures with nanometer-thick petal assembly are obtained at the extremely high concentration of H2O2. The oriented attachment of the small gold nanosheets creates the basal sheets of the flower structures. Then, the growth of the starch-bound {111} facet nano-petals take place on the surface of the basal sheets causing the formation of flower-like gold nanostructures. We explore the applications of gold nanosheets as a pigment for decoration and a solid substrate for surface enhanced Raman spectroscopy. A single particle of the flower-like gold nanostructure can be employed as a substrate for surface enhanced Raman spectroscopy.
DOI: 10.14457/cu.the.2015.474
title: PREPARATION OF CALCIUM OXIDE SUPPORTED RICE HUSK SILICA AS CATALYST FOR BIODIESEL PRODUCTION

description: This research aims to use calcium oxide supported on rice husk silica (CaO/SiO2) as a solid base catalyst. The catalyst was prepared by impregnation method and used in transesterification reaction of palm oil as feedstock with methanol to produce biodiesel. The factors influencing the preparation of catalyst were studied including calcination temperature and the weight percentage of CaO. The synthesized CaO/SiO2 catalyst was characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier transform infrared (FT-IR), N2 adsorption-desorption measurement techniques and the basicity of catalyst was determined by titration method. The results indicated that 30 wt.% of Ca(NO3)2 loaded on 5 wt.% of SiO2, calcined at 700ºC for 3 h, exhibited the most active catalyst. The transesterification of palm oil with methanol was studied for biodiesel synthesis. The effects of the mole ratio of methanol to oil, time of reaction, and mass of catalyst to oil were investigated to optimize the reaction condition. The results showed that by using 1:9 mole ratio of oil to methanol, 3 wt.% of catalyst based on oil weight at 65°C for 3 h of reaction time, 98.36% of methyl ester content was obtained. This catalyst could be reused up to 4 times with slightly loss in catalyst activity. As a result, the catalyst produced from calcium oxide supported on rice husk silica was proved to exhibit an excellent stability and a high activity for biodiesel production.
DOI: 10.14457/cu.the.2015.475
title: BIOSYSTEMATICS OF GASTROPODA FOSSIL FROM PERMIAN TAK FA FORMATION, AMPHOE TAK FA AND AMPHOE TAKHLI, CHANGWAT NAKHON SAWAN

description: The Permian carbonate rocks of the study area from Amphoe Tak Fa and Amphoe Takhli, Changwat Nakhon Sawan belong to the Tak Fa Formation, Saraburi Group. The exposures have been measured that totally reach a thickness of 50 meters and samples were collected for both petrographic study and paleontological investigation. The rock consists of bedded limestones, mudstones and dolomites, together with nodular cherts and intercalation of dark-grey shale, which comprise many marine invertebrate fossils such as fusulinids, pelecypods, corals, spongs, calcareous algae and bryozoa, especially a diversity of gastropod. Forty gastropod species are reported, among them 17 nominate species and 23 species in open nomenclature. Thus, this fauna represents one of the richest Permian gastropod faunas known from Southeast Asia. Twelve species and one genus are new to science. The new genus is Takfaia. The new species are Pharkidonotus khaonoiensis, Khumerspira thailandensis, Baylea? umbilicata, Takfaia kuesi, Glabrocingulum magnum, Knightinella ornata, Anomphalus lateumbilicatus, Yunnania pulchra, Microdoma carinata, Trachydomia takhliensis, Goniasma tricarinata and Cambodgia acuminata. The gastropod fauna is dominated by typical Late Palaeozoic cosmopolitan genera with bellerophontoids and pleurotomariines being most abundant. They were subdivided into 3 assemblages, including Bellerophon sp. – Glabrocingulum sp. zone, Stegocoelia sp. and Gastropod barren zone. The study of carbonate facies and fauna indicates that the depositional environment was on shelf lagoon within the carbonate platform varying from shallow to deep marine.
DOI: 10.14457/cu.the.2015.476
title: DEVELOPMENT OF ELECTROCHEMICAL SENSOR FOR DETERMINATION OF GLUCOSAMINE USING DROPLET MICROFLUIDIC SYSTEM

description: A droplet-based electrochemical sensor for direct measurement of D-glucosamine was developed using carbon paste electrodes (CPEs) modified with gold nanoparticles (AuNPs) and polyaniline (PANI). Central composition design (CCD) was employed as a powerful method for optimization of parameters for electrode fabrication. The optimized amounts of AuNPs and PANI were determined as 300 and 3,000 mg L-1, respectively. In addition, the optimum pH of buffer was found to be pH 4. For batch measurements, two linear ranges of glucosamine were observed. The first and second linear ranges were 0.05-40 mM and 40–100 mM, respectively. Using the first linear range, limits of detection and quantitation (LOD and LOQ) were calculated as 2.8 and 9.4 µM, respectively. Coupled with a droplet microfluidic system, the analysis of glucosamine was performed in a high-throughput manner with a sample throughput of at least 60 samples h-1. In addition, the adsorption of the analyte on the electrode surface was prevented due to compartmentalization in droplets. Linearity of the proposed system was found to be in the range of 0.5–5 mM with LOD and LOQ of 0.45 and 1.45 mM, respectively. High intra-day and inter-day (evaluated among 3 days) precisions for the detection of 50 droplets containing glucosamine were obtained with %RSD less than 3%. The system was successfully used to determine the amounts of glucosamine in supplementary products with error percentage and relative standard deviation less than 3%. In addition, the amounts of glucosamine measured using the developed sensors were in good agreement with those obtained from a traditional CE method. These indicate high accuracy and precision of the proposed system for determination of glucosamine in supplementary products.
DOI: 10.14457/cu.the.2015.477
title: THEORETICAL INVESTIGATION OF ELECTRON TRANSFER PROCESS IN D-AMINO ACID OXIDASE WITH ITS INHIBITORS

description: The photoinduced electron transfer (PET) rates between Iso and nearby amino acid residues of D-amino acid oxidase (DAAO) were studied using Kakitani-Mataka ET theory and DAAO conformations from molecular dynamics (MD) simulation. These PET rates of DAAO were inspired to a novel way for discovery new DAAO inhibitors by inhibiting ET process. The first part of this thesis, the interaction and dynamics properties of DAAO from pig kidney for four systems i.e. DAAO monomer, DAAO dimer, DAAO complexed with benzoate (DAOB) monomer, and DAOB dimer were studied by MD simulations. DAAO and DAOB MD simulation results revealed the different conformations between monomer and dimer, as well as the non-equivalent conformations in dimer. The results of PET analysis of DAAO showed that the three fastest ET rates are from Tyr224, Tyr228, and Tyr314 to Iso* of DAAO. The benzoate in DAOB, as a competitive inhibitor, is the best electron donor to Iso* compare to other amino acids which is agreed with the experimental fluorescence lifetime quenching. The second part of this thesis, DAAO from human was studied to find potential DAAO inhibitors for schizophrenia treatment using virtual screening technique. Four million compounds on Namiki database were screened using pharmacophore model and molecular docking. The 22 hit compounds will be tested biological activity.
DOI: 10.14457/cu.the.2015.479
title: MORPHOLOGICAL CHARACTERISTICS, SEXUAL BEHAVIORS AND GENETIC INFORMATION OF HYBRIDS BETWEEN RHESUS Macaca mulatta AND LONG-TAILED MACAQUES M. fascicularis IN KHAO KHIEOW OPEN ZOO, THAILAND

description: Rhesus (Macaca mulatta) and long-tailed (M. fascicularis) macaques are in the same fascicularis species group but live in the different climate zones. Rhesus macaques inhabit the cooler climate (15–35°N) while long-tailed macaques inhabit the warmer climate (20°N–10°S). The natural hybrid zone between these two species is 15–20°N, and difficult to study. This work focused on a hybrid population between these two species which was recently found in Khao Khieow Open Zoo, (KKZ; 13°21′N, 101°06′E) where a group of rhesus macaques was released into the habitat of feral long-tailed macaques about 20 years ago. Their morphological and genetic characteristics and sexual behaviors were evaluated. Photogrammetric method was used to assess %relative tail length (RTL) and contrast of the yellow pelage color (Cb*). %RTL, Cb* together with crown hair, cheek hair, and sex skin reddening were analyzed by Multiple Correspondence Analysis (MCA) and Agglomerative Hierarchical Cluster Analysis (AHCA) and categorized the KKZ macaques into 5 groups of long-tailed like (L4R0), hybrid (L3R1, L2R2 and L1R3), and rhesus-like (L0R4) macaques. Genetic discrimination of the two species and hybrids was done by STAT6 SNP analysis using PCR-RFLP technique. The 745 base pair fragment of STAT6 gene was digested with ApaI and gel electrophoresed which gave two, one and three band patterns that correspond to the G/G genotypes of long-tailed, A/A genotype of rhesus and A/G genotype of hybrid macaques, respectively. Of 118 KKZ samples, 6 (5%), 56 (47%), and 56 (47%) showed A/A, A/G, and G/G genotype, respectively, which were corresponded to their morphological characteristics. The frequency of G (long-tailed) allele in the population from the year 2006 to 2014 was significantly increased from 0.60 to 0.79, indicating a cline to long-tailed macaques. Nineteen adult females were selected from those 5 groups of KKZ macaques, and sexual behaviors including proceptivity, attractivity, and receptivity were collected by scan sampling method, 6–8 days/month from December 2011 to November 2012. All 5 monkey groups showed comparable patterns of sexual behaviors throughout the year. The patterns depicts breeding season with birth peak during March and May, especially in rhesus-like macaque group of which the receptivity was not seen during April and May. The results gained from this study are incongruent with previous reports indicating that rhesus macaques are strict seasonal breeders and long-tailed macaques are non-seasonal breeders. In regard to the morphological, genetic and behavioral studies of KKZ population, it confirms that the hybrids between rhesus and long-tailed macaques show intermediate characteristics between the two species and these characteristics are associated with each other.
DOI: 10.14457/cu.the.2015.480
title: Cloning and expression of alanine dehydrogenase gene from halotolerant cyanobacterium Aphanothece halophytica in Escherichia coli

description: Alanine dehydrogenase catalyzes the reversible reaction of pyruvate to alanine (PvRA and ALD) and non-reversible reaction of glyoxylate to glycine (GxRA). It plays a crucial role for sporulation in bacteria while it is required for pigment degradation in photosynthetic organisms. In this study, the putative gene encoding alanine dehydrogenase from halotolerant cyanobacterium Aphanothece halophytica (ApalaDH) was cloned and expressed in Escherichia coli. ApalaDH was successfully expressed into the expression vector pColdI and pColdTF but not in pTrcHis2C. Recombinant ApalaDH was purified homogeneity and then functionally characterized. Recombinant ApalaDH exhibited two catalytic activities of pyruvate to alanine and glycine to glyoxylate, which were different from the AlaDH from filamentous cyanobacterium Anabaena variabilis. The kinetic parameter Km of ApalaDH for pyruvate, alanine and glyoxylate were 0.22 ± 0.02, 0.72 ± 0.04 and 1.91 ± 0.43 mM, respectively. These Kms of ApalaDH suggested high affinity for all substrates. The expression level under salt stress was carried out by semi-quantitative RT-PCR. The result showed that ApalaDH expression increased approximately two folds under salt stress. Furthermore, in vivo analysis was performed. Under salt stress condition, the PvRA and GxRA activities were increased about 1.3- and 2.7-folds, respectively. These results implicated that ApalaDH would important under salt stress condition. To our knowledge, this is the first functional characterization of AlaDH in cyanobacteria.
DOI: 10.14457/cu.the.2015.481
title: GAUSSIAN PROCESS FOR TURNING POINTS PREDICTION AND APPLICATION IN STOCK TRADING STRATEGY

description: In the financial price sequence, the turning points prediction using the time series data form stock prices in Thai stock exchange. Turning points are critical local extreme points along a series. A trader who is able to buy stocks at trough prices and sell at peak prices to enter/exit the market precisely at the turning points would gain the maximum possible profit. In addition to using the Gaussian process model for predicting the turning points, in this project, we also test and compare the efficient techniques of modeling between the Gaussian Process Model, Neural Network and Support Vector Regression, respectively. Finally, we utilize the developed turning point prediction model to create trading strategy for the derivation of maximum profit.