cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2005.1710
title: Purification and characterization of phenylalanine dehydrogenase from Bacillus lentus

description: Bacillus lentus in a NAD[superscript+] dependent phenylalanine dehydrogenase (EC 1.4.1.20) producing bacteria. The optimum condition for the enzyme production was 18 hours of cultivation in 1% pepton medium, pH 7.0 supplemented with 0.4% L-phenylalanine at 37degrees Celsius. The enzyme was purified to homogeneity by DEAE-Toyopearl, Butyl-Toyopearl and Sephadex G-200 column chromatography with 18.4% yield and 166.3 purification fold. The enzyme had a molecular mass of about 360,00 Da as determined by Ferguson plots and consisted of 8 identical subunits. The enzyme showed high substrate specificity in the oxidative deamination on L-phenylalanine and the reductive amination on phenylpyruvate. The NAD[superscript +] analog 3-acetylpyridine- NAD[superscript +], gave 1.74 times higher activity than its natural coenzyme, NAD[superscript +]. The optimum pH for the the oxidative deamination and the reductive amination were 10.4 and 8.5, respectively and optimum temperature were 50degrees Celsius and 55degrees Celsius, respectively. The enzyme was stable over a broad pH range of 6.0 and 12.0. No loss of the enzyme activity was observed upon incubation at 50degrees Celsius for 4 hours. The enzyme retained 50% of the activity after incubation at the same temperature for 3 days. The enzyme activity was inactivated completely by AgNO[subscript 3] at a final concentration of 1 mM. D-Phenylalanine, D-methionine, D-leucine, D-tryptophan, hydrocinnamate and p-hydroxyphenylacetate inhibited the oxidative deamination of L-phenylalanine. The apparent K[subscript m] values for L-phenylalanine, NAD[superscript +], phenylpyruvate, NH[subscript 4]CI and NADH were 0.59, 0.55, 0.18, 300 and 0.09 mM, respectively. Initial-velocity and product inhibition studies showed that the reductive amination proceeded through a sequential ordered ternary-binary mechanism. NADH bound first to the enzyme. Followed by phenylpyruvate and then NH[subscript 4]CI, and the products were released in the order of L-phenylalanine and NAD[superscript +].
DOI: 10.14457/cu.the.2005.1711
title: Modeling of finite time shock acceleration

description: Energetic storm particles (ESP) of various ion species have been shown to arise from a suprathermal seed ions accelerated by traveling interplanetary shocks. The observed spectral rollovers at~0.1 to 10 MeV/nucleon can be attributed to the finite time available for shock acceleration. We construct a finite time shock acceleration model for describing ESP events at interplanetary shocks near the Earth. Using the locally measured shock strength parameters as inputs, the finite-time shock acceleration model can successfully fit the energy spectra of carbon, oxygen, and iron ions measured by the Ultra-Low-Energy lsotope Specturemeter (ULEIS) on board the Advanced Composition Explorer during 3 ESP events. The inferred scattering mean free path in the acceleration region ranges from a typical interplanetary value for the weakest ESP event down to 0.003 AU for the strongest event.This is consistent with the idea that proton-amplified waves result from the very intense particle fluxes in major events.
DOI: 10.14457/cu.the.2005.1712
title: Preparation of copper-titanium silicalite-1

description: The effects of incorporating Cu atom directly into the TS-1 framework during the formation of TS-1 crystalline for the gas phase selective oxidation of 2-propanol were investigated under inlets conditions of 8 vol% of O[subscript 2] and 5 vol% of 2-propanol in the reaction temperature range of 100-500 [degrees Celsius]. The research found that TS-1 can be successfully modified by copper incorporation. Three forms of copper (II) ions exist in three different environments in the catalysts. Isolated copper (II) ions incorporated into the titania network were detected by ESR spectroscopy, exists on CuO phase (from the ESR results) and surface complexes of Cu ions with titania (from the XPS results). Temperature programmed desorption of ammonia (NH[subscript 3]-TPD) are used to determine the amount and strength of acid site to find the relationship between catalytic behavior and catalyst properties. From the catalytic reaction, it can be indicated that thecatalyst oxidation over Cu-TS-1 catalyst yields acetone more than TS-1 catalyst. The addition of Cu to TS-1 catalyst slightly affects the over all conversion of 2-propanol, but significantly increases the selectivity toward CO[subscript 2]. Nevertheless, there is no direct relationship between the content of Cu and the selectivity of propylene. Similarities between structure, properties and catalytic activity of TS-1 and Cu-TS-1 catalysts exists. This research indicated that lower copper concentration, higher acid strength. In addition, an appropriate combination of acid sites should exist to improve the catalytic activity and selectivity.
DOI: 10.14457/cu.the.2005.1713
title: Analysis of holder regularity by curvelet and similar transforms

description: Using ridgelet transform and Smith wavelet-like transform, new necessary conditions and sufficient conditions for a function to have uniform and pointwise Holder exponent [is proportional to] [is an element of] (0, 1) are given. We also obtain necessary conditions for function to have some Holder regularity in terms of its continuous curvelet transform. Similar to the characterization of Holder regularity by continuous wavelet transform, the conditions here are in terms of bounds of the transforms across fine scales. In 2-dimensional ridgelet transform, order of bounds in the sufficient condition and necessary condition differ by 1 in both uniform and pointwise regularity cases. Moreover, due to the parabolic scaling of the Smith transform, orders of bounds in the sufficient condition and necessary condition differ by 3/2 in both uniform and pointwise cases. However, the decay of bound of the ridgelet transform of a function with pointwise Holder regularity does not depend upon exponent. Because of the directional nature of these transforms, we are also interested in characterizing functions with directional regularity via its transform. We obtain a necessary condition for a function to have directional regularity in terms of its continuous ridgelet transform across fine scales.
DOI: 10.14457/cu.the.2005.1714
title: Promotion of adventitious root growth by coffee extracts

description: The preliminary screening results on plant growth regulation of the ethanolic extract of reasted coffee indicated that at high concentration the growth inhibition of plant seeds were observed, while at low concentration the growth promotion clearly visualized. In addition, the highest growth promotion of C. atropurpureus (55%) stimulated by the extract from roasted coffee at 100 ppm was observed while that of H. rosa-sinensis was achieved at 1000 ppm (84%). The bioassay-guided fractionation of the ethanolic extract led to the isolation of substances. Their structures were characterized by means of physical properties and spectroscopic data. The major compound was caffeine while the minor one was a mixture whose structure could not be identified. Caffeine showed the highest plant growth activity on C. atropurpureus at 100 ppm (61%) and H. rosa-sinensis at 10 ppm (81%). Plant growth regulation of plant seeds of caffeine exhibited the same the ethanolicextract. Caffeine (61%) enhanced the root growth promotions and stimulated the rooting of stem cuttings more than other compounds in roasted coffee such as chlorogenic acid (5%), theobromine (39%), theophylline (37%) and trigonelline (27%). It may be concluded that the main plant growth regulator of roasted coffee was caffeine
DOI: 10.14457/cu.the.2005.1715
title: Halogenated reagents and triphenylphosphine for the syntheses of amides, esters and sulfonamides

description: The utilization of Cl[subscript 3]CCONH[subscript 2] and PPh[subscript 3] could be applied to prepare nine benzamides whose structures are related to DEET. This reagent could also be successfully utilized to synthesize esters. Examining the scope of the reaction revealed that this reagent was suitable for primary and secondary alcohols while tertiary alcohol did not proceed well. However, tertiary carboxylic acid could transform efficiently to ester. The mechanistic studies supported by IR, [superscript 1]H- AND [superscript 13]C-NMR spectral data clearly exhibited that these reactions occur via acid chlorides. The new methodology for the preparation of sulfonamides using halogenated reagents and PPh[subscript 3] was in addition disclosed. The effects of type of halogenated reagents, amount of reagents, type of bases and solvent system were investigated to optimize reaction conditions. Cl[subscript 3]CCN in combination with PPh[subscript 3] approved to be a highly reactive reagent for conversion of sulfonic acids to the corresponding sulfonyl chlorides in refluxing CH[subscript 2]Cl[subscript 2] within 1 hour. Upon treating with amines, the corresponding benzenesulfonamides were achieved in good to excellent yields. This reaction worked well for all amines selected: primary aliphatic, secondary aliphatic and aromatic amines
DOI: 10.14457/cu.the.2005.1716
title: Development of flow cell for voltammetric applications

description: In this research, cost-effective flow cells were designed and fabricated using low-cost materials supplied from local hardware stores. Hydrodynamic behavior of these homemade flow cells was characterized using mathematical equation. The fabricated flow cell equipped with boron-doped diamond thin-film (BDD) electrode was used as an amperometric detector in a flow injection analysis system. Malachite green (MG) and leucomalachite green (LMG) were investigated using this system. Cyclic voltammetry as a function of the pH of supporting electrolyte solution and the scan rate in batch experiment was also studies. Determination of MG and LMG using BDD electrode as an amperometric detector in HPLC system was also demonstrated. The signals of both MG and LMG were clearly observed. These results indicate the BDD electrode has a potential to be a detector for HPLC system. With proper design, another fabricated flow cell was used as an interface in an electrochemical surface plasmon resonance (EC-SPR) instrument. This instrument was used to investigate a self-assembled monolayer of decanethiol on gold surface. Both electrochemical and optical signals were recorded simultaneously. The results demonstrate that the electrochemical control coupled with sensitive optical measurements provides a basis for further development of this device into a powerful biosensor.
DOI: 10.14457/cu.the.2005.1717
title: Allylic oxidation of alkenes catalyzed by metal stearate complexes

description: This research focuses on the development of a catalytic system using metal stearate for allylic oxidation. Cyclohexene was employed as a model substrate. Both types of catalyst and amount of TBHP are essential in promoting the reaction. With the use of TBHP as an oxidant in combination with chromium (III) stearate catalyst at 70 degree Celsius for 24 hours afforded an alpha, Beta-unsaturated carbonyl compound in high yield with good selectitivy. Moreover, the allylic oxidation worked well in non-polar aprotic solvent, such as isooctane, toluene, benzene, acetonitrile and pyridine. Under optimized conditions, alkenes were oxidized to the corresponding alpha, Beta-unsaturated ketone in good to excellent yiel. Moreover, the allylic oxidation of alpha-pinene, 1-methylcyclohexene, alpha-ionone, Belta-ionone, Belta-ionone and isophorone could be fruitfully accomplished in moderate to high yield with excellent selectivity to the corresponding alpha, Beta-unsaturated carbonyl compounds. This developed allylic oxidation reaction was believed to undergo via a free radical process.
DOI: 10.14457/cu.the.2005.1718
title: Neotectonics of the Thoen fault system, Lampang basin, Northern Thailand

description: Neotectonics of Thoen fault zone in the northern Thailand is far from understood, mainly because of the poor tools geologists have in assessing neotectonic structures and determining active faults in basement rocks of the Cenozoic basin. The major faults along the eastern edge of the Cenozoic basin were previously estimated from imagery remote-sensing interpretation on regional scale and no detail of remote-sensing and field based data are investigated. The behavior of the tectonic stress field in basement rocks and its relation to the neotectonics in Cenozoic basins are within poorly understood. The study area is located within the N-NE striking Thoen fault zone, with a total length of about 120 km cross the Mae Moh, Lampang, and Thoen basins. The three main methods of study, remote-sensing study, petrographic study, and subsurface study, show good results for determining the neotectonic structure in the study area. Detailed result from lineament analysis had lead to the good field evidence of morphotectonic and Quaternary faulting Rock sampling for petrographic analysis, and six exploratory locations for ground penetrating radar (GPR) were performed subsequently using the results of field surveys. The overall results lead to the reconstruction of evolution model and the Thoen fault system is defied as Neotectonic fault zone which is the youngest structure formed since 40 Ma age after Indian-Eurasian collision. The NE-SW oblique-sinistral strike-slip movement is agreed with the dominantly current tectonic regime. The very shallow subsurface reverse faulting, with dip to SE about 12-20 degrees apparently were clearly detected from GPR profiles in Cenozoic basin. This suggests that tectonic process have occurred in the current tectonic regime, so its movement is likely to be the "active tectonics" definition. The revised method for active tectonic study is also proposed.
DOI: 10.14457/cu.the.2005.1719
title: Intelligibility of English speech between Singaporean and Thai English Speakers

description: This research study is aimed to measure the intelligibility level of English speech of Singaporean English speakers towards Thai English speakers and vice versa. Also, it specifies the phonetic features that cause intelligibility failures in communication between Singaporean and Thai English speakers. The measurement is targeted at word-recognition level by using the phonemic contrast elicitation test. Dictation is taken as the method of testing performed by 10 Singaporean and 10 Thai university students who are competent users of English. The findings show that intelligibility levels of Singaporean English speakers toward Thai English speakers are higher than those of Thai English speakers toward Singaporean English speakers, which are 57 per cent and 44.25 per cent in average, respectively. It is also found that only 3 distinctive phonetic features used by Thai English speakers, namely, replacement of /w/ for /v/; replacement of /ts/ for /f/; and dentalization of /d/ substituting for /o/ are the cause of intelligibility failures of Singaporean English speakers. On the other side, only 2 distinctive phonetic features used by Singaporean English speakers, namely, change of monophthong /ae/ into /e/ and change of diphthong /ai/ into /au/ are the cause of intelligibility failures of Thai English speakers. However, the use of distinctive phonetic features is only a minor cause of intelligibility failures comparing with other factors.
DOI: 10.14457/cu.the.2005.1720
title: Application of Rock Mechanics Algorithm to Optimize Drilling Rate of Penetration

description: This study aims to generate predicted drilling rate of penetration (ROP) model based on rock mechanics algorithm concept in order to improve drilling performance in the Gulf of Thailand. The first step of the study is to determine the bit sliding coefficient value which is depended on particular selected drilling bit. This process of work utilized drilling and wireline logging data from an offset well to construct Rock Mechanics Algorithm (RMA) model with RMA software. After that, statistical analysis method is brought into this stage to facilitate in data matching result. The drilling optimization model is constructed in RMA model with an appropriate bit sliding coefficient value derived from the previous process. In this procedure, Unconfined Compressive Strength (UCS), Overburden pressure, Fluid pore pressure, and drilled & wireline log recorded are input into the program. Finally, Specific Energy Rate of Penetration (SEROP) which is a potential maximum ROP scheme is generated at each wellbore depth. Moreover, RMA model also shows the zone of high abrasivivity formation in order to adjust drilling parameters while drilling to maintain drilling bit life. On drilling rig site study, SEROP with recommended drilling parameters are oriented to actual drilling operation. The results show the improvement of average ROP comparing to an offset well. A single bit run to Target Depth (TD) is also one of the accomplish result from the bit life study. The major benefits are eliminating redundant drilling bit cost and drilling rig cost from tripping time. RMA model is a powerful tool using with Cost per Foot (CPF) analysis while conduct drilling operation or encounter critical ROP situation. Drilling RMA model is also helpful for the project well designer and cost estimator.
DOI: 10.14457/cu.the.2005.1721
title: The study of geographic distributions of microsatellite DNA in Thai population

description: Short tandem repeat (STR) is valuable tool in Forensic Medicine for identification of individuals. Detailed statistics of each STR allele information is unique among each ethnic group. Frequency of each STR loci is needed for calculation of probability of match and has not been determined in a large scale in Thai population. It is not known whether STR loci may be able to identify people from each geographical region. DNA from buccal swab from 1000 non-related Thais; 200 from each region: Northern, North-eastern, Eastern, Southern and Central of Thailand, were collected for PCR amplification of 16 STR loci, D8S1179, D21S11, D7S820, CSF1P0, D3S1358, THO1, D13S317, D16S539, D2S1338, D19S433, vWA, TPOX, D18S51, Amelogenin, D5S818 and FGA, using AmpFlSTR Identifiler[superscript TM] kit. Automated 3100 DNA sequencer was used to analyze STR alleles using GeneMapper ID V3.2. The results show difference of DNA fingerprint among the 1000 subject. The range ofpower of discrimination of STR is 0.794-0.971. The range of matching probability is 0.029-0.206. The range of polymorphic information content (PIC) is 0.55-0.86. The range power of exclusion is 0.286-0.753. The typical paternal index is 1.24-4.13. The heterozygosity is 59.6-87.6%. Hence all studied STR loci show variety and can be applied for identification of person and parent-and-child relationship. The chance of identify identical person using AmpFlSTR Identifiler[superscript TM] kit is 1 in 2.87 x 10[superscript 17]. There is no distinctive pattern of any STR marker for people from each region of Thailand.
DOI: 10.14457/cu.the.2005.1722
title: Safety management system for hazardous substance transportation based-on risk analysis

description: The objective of this study is to develop a Safety Management System (SMS) for hazardous substance transportation. The selected case study company is a leading hazardous chemical transportation operator in Thailand, however, for the past two years the company experience persistently high accidents/incidents rate in its handling and delivery process. Primarily, with the help from the company management, the author was able to set up a SMS Working Team, comprising representatives from various departments of the company and the author. The SMS proposed in this study was developed based on using British Standard BS8800 (1996) as a reference model. The SMS working team conducted a gap analysis using checklist to determine the additional requirement to the current system. The proposed SMS is a system to identify, analyze and update all existing risks of on-going delivery operations and to reduce occurrence probability and mitigate the consequences of safety accidents/incidents through comprehensive risk analysis process. Next step is to conduct risk analysis on major severity on major severity avoidable accident/incident cases which occurred between January 2003 and December 2004. From brainstorming and Failure Mode and Effect Analysis (FMEA), recommended actions were proposed and some of which were adopted into revised policy and procedures by the SMS working team. The proposed recommended actions are carried out by the related officer to make sure that the acceptable risk level is eventually achieved. The implementation results of the proposed SMS and recommended actions may not clearly indicate that the proposed SMS and recommended actions significantly reduce the rate and financial impacts cause by major severity avoidable accident/incident, but with the SMS in place, accident/incident can now be track, identify and analyze, in order to reduce occurrence probability and mitigate the consequences of accidents/incidents.
DOI: 10.14457/cu.the.2005.1723
title: Companion modelling for razor clam Solen regularis conservation at Don Hoi Lord, Samut Songkhram Province

description: This study aimed to access the current razor clam population dynamics of Don Hoi Lord, to identify fisherman behavior and interactions, and to construct a multi-agent simulation model for collective discussion of razor clam management and conservation. Companion modeling approach, specifically Multi-agent system model (MAS) and Role-Playing game (RPG) was used in this study. Monthly filed data collection was conducted for one year. Line transects and quadrat sampling method were used for collecting razor clam population data on the biggest sand dune in Don Hoi Lord. In addition, socio-economic surveys of local fisherman were conducted monthly to understand their harvesting behavior. A Multi-agent simulation model was constructed under Cormas platform based on both of razor clam population data and local fisherman harvesting behavioral patterns. Then, two rounds of RPG were organized in March and July 2005, to initiate collective discussion among stakeholders. Mean razor clam density was 5.71+-2.49 individual/m[superscript 2], mean razor clam length was 4.55+-0.90 cm and dominant size class was 3-5 cm. At the moment, razor clam population has started to recover from the past exploitation caused by razor clam harvesting policy of provincial government. Besides, both rounds of RPG were an efficient tool to initiate collective learning and discussion among stakeholders. In each round, 4 scenarios were played. Scenario II (closed zone rotation for 3 month/each) in first RPG and scenario IV (quota system) in second RPG have been agreed upon by stakeholders and possible implemented in the future. The result of the multi-agent simulation model based on both agreed scenarios indicated that the razor clam population has responded positively due to consistent dynamics of razor clam population. Finally, a policy based on both agreed scenarios should be an appropriate management for razor clam conservation