Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

2018

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 22861 - 22890 of 23961

Full-Text Articles in Entire DC Network

Immunity To Pertussis Vaccination, Nasamon Wanlapakorn Jan 2018

Immunity To Pertussis Vaccination, Nasamon Wanlapakorn

Chulalongkorn University Theses and Dissertations (Chula ETD)

Thailand has implemented universal whole cell pertussis vaccination in children for more than 35 years; nevertheless, the numbers of reported pertussis cases are still on the rise, especially among infants below one year who bear the greatest risk of severe complications. Several countries have implemented a pertussis booster during adolescence. However, data on the appropriate age groups targeted for a booster in the Thai population is limited. The increase in pertussis incidence among Thai infants warrants the need to further investigate the pre-existing maternal antibody against Bordetella pertussis (B. pertussis) antigens and the potential benefit of Tetanus toxoid-reduced dose of …

Go to article

Effect Of Major Triterpenoids Of Centella Asiatica On Neurite Outgrowth In Neuro-2a Cells, Nonthaneth Nalinratana Jan 2018

Effect Of Major Triterpenoids Of Centella Asiatica On Neurite Outgrowth In Neuro-2a Cells, Nonthaneth Nalinratana

Chulalongkorn University Theses and Dissertations (Chula ETD)

Centella asiatica has been reported to demonstrate neuroprotection and memory improvement in various animal models. Triterpenoid glycosides, madecassoside (MS), asiaticoside (AS), and their aglycones, madecassic acid (MA) and asiatic acid (AA) are considered as major neuroactive constituents in C. asiatica. In this study we aimed to compared MS, AS, MA and AA for their neurite outgrowth activities and mechanisms in Neuro-2a cells. Immunofluorescent staining against ßIII-tubulin showed that MS and AS significantly increased the percentage of neurite-bearing cells and neurite length with higher potency than MA and AA. Our mechanistic studies revealed the differences in signal activation between glycosides and …

Go to article

A Study On The In Vitro Stability And Metabolism Of Curcumin Diethyl Disuccinate In Plasma, Pahweenvaj Ratnatilaka Na Bhuket Jan 2018

A Study On The In Vitro Stability And Metabolism Of Curcumin Diethyl Disuccinate In Plasma, Pahweenvaj Ratnatilaka Na Bhuket

Chulalongkorn University Theses and Dissertations (Chula ETD)

Stability in aqueous media such as buffers and plasma are the one of important properties of drug candidates. Curcumin diethyl disuccinate (CDD), an ester prodrug of curcumin, has been developed to improve the chemical stability of curcumin. In this study, the in vitro stability of CDD in HCl buffer (pH 1.2), acetate buffer (pH 4.5), phosphate buffer (pH 6.8, 7.4 and 8.0) and in vitro metabolism of CDD in rat, dog and human plasma were investigated at 4, 25 and 37 °C. HPLC and nonlinear regression analyses showed that the degradation of CDD in buffers was temperature-dependent and followed pseudo-1st …

Go to article

Optimization Of Protein Hydrolysate Preparation From Split Gill Mushroom Schizophyllum Commune, Aunchalee Wongaem Jan 2018

Optimization Of Protein Hydrolysate Preparation From Split Gill Mushroom Schizophyllum Commune, Aunchalee Wongaem

Chulalongkorn University Theses and Dissertations (Chula ETD)

The optimum conditions for hydrolysate production from split gill mushroom protein using the microbial protease, Alcalase were investigated. The study was conducted using central composite design and response surface methodology. Three independent factors: hydrolysis temperature (45, 50, and 55 °C); hydrolysis time (60, 120, and 180 min); and enzyme to substrate ratio (2%, 4%, and 6% w/v) were varied, while the pH was fixed at pH 8. These three factors had a significant effect on the DH and ABTS radical-scavenging activity (p < 0.05). The optimum conditions obtained from experiments were: enzyme to substrate ratio 2%; hydrolysis time 161.4 min; and temperature 55 °C. The coefficient of determination (R2) of total protein and the IC50 value for ABTS radical-scavenging activity were 0.972 and 0.205 µg/mL, respectively, and the DH value was 50.882%. The hydrolysate was fractionated by molecular weight (MW) cut-off membranes (10, 5, 3, and 0.65 kDa). The < 0.65 kDa fraction had the highest radical scavenging ability (IC50 = 0.026 ± 0.004 µg/mL). The MW < 0.65 kDa fraction was separated by reversed-phase HPLC to yield four subfractions (F1–5). The F4 subfraction showed the highest maximum ABTS radical-scavenging activity and was selected for further analysis by quadrupole-time-of-flight-electron spin induction–mass spectrometry-based. Five antioxidant peptides were identified. In addition, the MW< 0.65 kDa fraction protected against oxidation-induced DNA damage in pBR322, pKS, and pUC19 plasmids. Furthermore, the MW < 0.65 kDa fraction, exhibited cellular antioxidant activity in a human intestinal cancer cell line (HT-29), which was dependent on the peptide concentration. These results suggested that split gill mushroom protein hydrolysate is a good source of bioactive peptides and has potential as a natural antioxidant in food production and cosmetic products.

Go to article

Production Of 1, 12- Dodecanedioic Acid By Recombinant Microbial Cytochrome P450 In Pichia Pastoris And Saccharomyces Cerevisiae, Phawadee Buathong Jan 2018

Production Of 1, 12- Dodecanedioic Acid By Recombinant Microbial Cytochrome P450 In Pichia Pastoris And Saccharomyces Cerevisiae, Phawadee Buathong

Chulalongkorn University Theses and Dissertations (Chula ETD)

1,12-Dodecanedioic acid (DDA) is a primary compound which is used as an intermediate precursor for production of valuable chemical products. Biosynthesis of 1,12-DDA by recombinant (r) microorganisms can be used as an alternative method to compensate several disadvantages from chemical synthesis. The purpose of this study was to clone a CYP52A17 from Candida tropicalis to produce cytochrome P450 which can terminally oxidize fatty acids to hydroxy-fatty acids and further to dicarboxylic acids (ω-oxidation). The wild type rCYP52A17 and its engineered L261S/L490S (leucine changed to encode for serine) form (rCYP52A17mut) were expressed in Pichia pastoris and Saccharomyces cerevisiae which coexpressing the …

Go to article

Optimization Of Protein Hydrolysate Preparation And Their Angiotensin I-Converting Enzyme Inhibitory Activity From Shiitake Mushrooms Lentinula Sp., Supawee Paisansak Jan 2018

Optimization Of Protein Hydrolysate Preparation And Their Angiotensin I-Converting Enzyme Inhibitory Activity From Shiitake Mushrooms Lentinula Sp., Supawee Paisansak

Chulalongkorn University Theses and Dissertations (Chula ETD)

Angiotensin-I converting enzyme (ACE) is a key enzyme involved in regulating blood pressure. ACE converts angiotensin-I into angiotensin-II, which results in raised blood pressure. Inhibition of ACE leads to a decreased concentration of angiotensin-II and lowering of blood pressure. Food protein-derived ACE inhibitory peptides are considered to be a safer alternative to antihypertensive drugs. Shiitake mushrooms, one of the most consumed mushrooms in Thailand, are recognized as a nutritive food with health-stimulating properties. The aim of this study was to optimize the preparation of a shiitake-protein hydrolysate and investigate the ACE inhibitory activity of the hydrosylate. Shiitake mushrooms were hydrolyzed …

Go to article

Flowering Phenology And Pollination Biology Of Ceropegia Thailandica Meve And Ceropegia Suddeei Kidyoo, Chayanin Kraithep Jan 2018

Flowering Phenology And Pollination Biology Of Ceropegia Thailandica Meve And Ceropegia Suddeei Kidyoo, Chayanin Kraithep

Chulalongkorn University Theses and Dissertations (Chula ETD)

The flowers of the genus Ceropegia have complex structures that involve in pollination mechanism. These structres gynostegium, pollinarium and corona. Moreover, the corolla tube which is inflated at base and the corolla lobes are connate only at tip forming a cage-like structure functions as a trap. When pollinators are attracted to flower, they could be temporarily trapped inside the flower. From previous studies, there are about 18 species in Thailand. Most Thai species have flowers characterized by a long narrow corolla lobe with distinct inflated basal portion. However, some species have a short corolla tube, such as C. thailandica Meve. …

Go to article

Taxonomic Revision And Pollination Biology Of Orchid Genera Crepidium Blume And Dienia Lindl. (Malaxidinae, Orchidaceae) In Thailand, Anchalee Nuammee Jan 2018

Taxonomic Revision And Pollination Biology Of Orchid Genera Crepidium Blume And Dienia Lindl. (Malaxidinae, Orchidaceae) In Thailand, Anchalee Nuammee

Chulalongkorn University Theses and Dissertations (Chula ETD)

The terrestrial orchid Crepidium Blume and Dienia Lindl. in Thailand were enumerated by Gunnar Seidenfaden under Malaxis with key and drawings. Because of no species descriptions in publication, it is difficult to delimit species boundary. Moreover, recent discovery of new species results in unreliable assessment of species, therefore, the taxonomic revision of Crepidium and Dienia in Thailand should be carried out. The results indicated that the column and transversal callus on labellum are taxonomically important characters to delimit these two genera. In addition, morphological characters, i.e. stem and leaf morphology, labellum auricles, margins and number of teeth on distal margin …

Go to article

Simulation Of Water Effect On Biodiesel Production Using Waste Cooking Oil Via Ester-Transesterification In A Reactive Distillation Column, Ajala Anantapinitwatna Jan 2018

Simulation Of Water Effect On Biodiesel Production Using Waste Cooking Oil Via Ester-Transesterification In A Reactive Distillation Column, Ajala Anantapinitwatna

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research investigated the effect of water content in waste cooking oil (WCO) on the performance of a reactive distillation column for biodiesel production via ester-transesterification. A mixture of triolein and oleic acid was used as a WCO model compound. Amberlyst-15 was used to catalyze esterification while CaO was used for transesterification. From Langmuir-Hinshelwood-Hougen-Watson (LHHW) kinetic model taking into account water absorption for esterification of oleic acid (FFA), biodiesel yield was decreased with increasing of water content in WCO feedstocks. On the other hand, the initial rate of transesterification was increased with increase of amount of water in WCO feedstocks …

Go to article

Synthesis Of Activated Carbons From Coffee Ground Residues And Their Application As Catalysts For Ethanol Dehydrogenation, Jeerati Ob-Eye Jan 2018

Synthesis Of Activated Carbons From Coffee Ground Residues And Their Application As Catalysts For Ethanol Dehydrogenation, Jeerati Ob-Eye

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this present study, characteristics and catalytic properties of activated carbon derived from coffee ground residue, cobalt metal (Co) supported-activated carbon and various metals (Ce, Co, Cu and Ni) supported-commercial activated carbon were determined and characterized. This study was divided into three parts. Regarding to the first part, the synthesis of activated carbon catalysts derived from coffee ground residues with different methods of physical activation was investigated. The results showed that the catalyst with physically activated by CO2 for 4 hours, exhibited the best catalytic activity of ethanol dehydrogenation to acetaldehyde. In the second part, the best catalyst from the …

Go to article

Hydrothermal Carbonization Carbon-Based Acid Catalyst For Biodiesel Production, Laddawan Tumkot Jan 2018

Hydrothermal Carbonization Carbon-Based Acid Catalyst For Biodiesel Production, Laddawan Tumkot

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aims to synthesize the production of biodiesel (oleic acid methyl ester) by esterification in the presence of sulfonated hydrothermal carbon based catalyst under microwave irradiation. The catalyst was prepared by hydrothermal carbonization, followed by sulfonation presenting sulfonic acid group as an active site. The catalyst characterization results confirmed good microwave-absorptivity of the catalyst which can be heated directly and accelerate the reaction immediately at the surface of the catalyst. Esterification of oleic acid (OA) with methanol experiments were optimized by using response surface methodology based on central composite design. Three variables: molar ratio of methanol to OA (2.5:1-7.5:1), …

Go to article

Computational Fluid Dynamics Modeling Of The Climate Inside A Chicken House, Nuttaphon Kanjanaudomsuk Jan 2018

Computational Fluid Dynamics Modeling Of The Climate Inside A Chicken House, Nuttaphon Kanjanaudomsuk

Chulalongkorn University Theses and Dissertations (Chula ETD)

Nowadays, most of chicken products are from a closed house system. Climate inside such chicken house can significantly affect chicken welfare and its productivity. Moreover, Thailand is in a tropical region where thermal stress is easily occurred. Suitable operating condition and chicken house design can help improve interior climate which can be evaluated by computational fluid dynamics (CFD) modeling technique. In this study, realizable k-ε model, energy conservation and species transport equations were applied to simulate the air velocity, temperature and relative humidity, respectively, inside the chicken house. The model was validated with measured air velocity, temperature and relative humidity …

Go to article

The Development Of Pt/Wox/Al2o3 For 1,3-Propanediol Production From Glycerol, Parama Uttraporn Jan 2018

The Development Of Pt/Wox/Al2o3 For 1,3-Propanediol Production From Glycerol, Parama Uttraporn

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this work, the researcher studied the hydrogenolysis of glycerol to 1,3-propanediol, by compared the catalytic activity between AlOOH (boehmite) and g-Al2O3. The catalysts were prepared by wet impregnation method. To investigate the properties, catalysts were characterized by XRD, XPS, BET, H2-TPR, H2-TPD, H2-TPR, SEM-EDX, Py-IR, NH3-IR, and XAS. The type of support showed to be of significance in deciding the activity and the selectivity to 1,3-propanediol. It was found that 2%Pt/WOx/g-Al2O3 gave higher activity and selectivity of 1,3-propanediol, which due to a large amount of active site and Brønsted acid site in the catalyst. The effects of H2 pressure, …

Go to article

Design And Performance Evaluation Of Integrated System Of Hydrotreating And Hydrogen Generation For Bio-Hydrogenated Diesel Fuel Production From Palm Oil, Siriporn Boonsuk Jan 2018

Design And Performance Evaluation Of Integrated System Of Hydrotreating And Hydrogen Generation For Bio-Hydrogenated Diesel Fuel Production From Palm Oil, Siriporn Boonsuk

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research studied the simulations of the integrated systems between of hydrotreating and hydrogen generation with various selectivity of deoxygenation (DO) pathways (i.e. decarboxylation (DCO2), hydrodecarbonylation (HDCO), and hydrodeoxygenation (HDO)). Two integrated systems were proposed i.e. 1) integrated system between single-step hydrotreating and propane steam reforming (as called "single-step integrated system") and 2) integrated system between two-step hydrotreating (hydrolysis+DO) and glycerol steam reforming (as called "two-step integrated system"). Results revealed that, among DO pathways, DCO2 exhibited the lowest total minimum energy requirement (total MER) and the highest total efficiency for both integrated systems mainly due to lower electricity requirement to …

Go to article

Application Of Capillary Electrophoresis For Determination Of Glycosaminoglycans In Biological And Cosmetic Samples, Kanokporn Chindaphan Jan 2018

Application Of Capillary Electrophoresis For Determination Of Glycosaminoglycans In Biological And Cosmetic Samples, Kanokporn Chindaphan

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this research, on-line preconcentration and determination of glycosaminoglycans (GAGs), especially chondroitin sulfate (CS), dermatan sulfate (DS) and hyaluronic acid (HA) using capillary electrophoresis (CE) was developed. Large-volume sample stacking using an electroosmotic flow (EOF) pump (LVSEP) technique was employed for on-line preconcentration and improvement of the detection sensitivity in CE method. Central composite design (CCD) was used to simultaneously optimize all parameters for CE separation. The optimized CE conditions were background electrolyte consisting of 200 mM sodium dihydrogen phosphate, 200 mM buthylamine and 0.5% w/v polyethylene glycol at pH 4.0 and separation voltage of -16 kV. Limit of detections …

Go to article

Metalloporphyrin-Sensitized Titania/Silica/Iron Oxide Nanocomposites And Their Photocatalytic Activities, Padtaraporn Chanhom Jan 2018

Metalloporphyrin-Sensitized Titania/Silica/Iron Oxide Nanocomposites And Their Photocatalytic Activities, Padtaraporn Chanhom

Chulalongkorn University Theses and Dissertations (Chula ETD)

New nanomaterials of the magnetic visible light active photocatalysts, tetra(4-carboxyphenyl)porphyrin (TCPP) with different metals [Mn(II), Fe(III), Cu(II), Zn(II) and metal-free] in the center adsorbed on titania-silica-iron oxide superparamagnetic composites (TSI) were synthesized successfully. The photocatalytic activities in methylene blue (MB) degradation were determined under incandescent lamp for 3 h. Their characteristics have been identified using UV-visible spectroscopy, X-ray diffractometry (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The photodegradation results revealed that the metalloporphyrin sensitization helped TSI to absorb the light in visible region. Titania-silica-iron oxide nanomaterials with copper(II) tetra(4-carboxyphenyl)porphyrin (CuTCPP) can significantly …

Go to article

Detection Of Sulfonamide Residues By Paper Spray Mass Spectrometry, Surased Suraritdechachai Jan 2018

Detection Of Sulfonamide Residues By Paper Spray Mass Spectrometry, Surased Suraritdechachai

Chulalongkorn University Theses and Dissertations (Chula ETD)

Sulfonamide antibiotics are commonly used veterinary drugs in livestock to prevent or treat infectious diseases. Their residues in food are of concern since they can cause adverse health effects and development of bacterial resistance. In this work, a practical method for detection and quantification of sulfamethazine, one of sulfonamide antibiotics, in pig body fluid samples is developed via the combination of simple extraction and paper spray mass spectrometry. The method required minimal sample preparation and low analysis time while providing high sensitivity and accuracies in pig whole blood (LOD = 10.1 ng/mL, %recovery = 95.4-104.1%), pig serum (LOD = 4.6 …

Go to article

Development Of Headspace-Solid Phase Microextraction And Gas Chromatography-Mass Spectrometry/Olfactometry For Analysis Of Volatile Compounds From Chicken Products, Wongkanok Yoosong Jan 2018

Development Of Headspace-Solid Phase Microextraction And Gas Chromatography-Mass Spectrometry/Olfactometry For Analysis Of Volatile Compounds From Chicken Products, Wongkanok Yoosong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Gas chromatography-mass spectrometry/olfactometry coupled headspace solid phase microextraction (HS-SPME-GC-MS/O) was applied to analysis of volatile compounds from raw chickens and boiled chickens. The HS-SPME was 50/30 mm DVB/CAR/PDMS. The extraction temperature of boiled chicken was 50 °C for 30 min and raw chicken were extracted at room temperature. The SPME Probes were analyzed by GC-MS with a HP-5MS capillary column. 16 volatile compounds were identified in the boiled chickens in four chemical classes including aldehydes, aromatic hydrocarbon, alcohols and ketones and 20 volatile compounds were identified in raw chickens in three chemical classes including aldehydes, alcohols and esters. The identification …

Go to article

Synthesis And Antidiabetic Activity Of Furofuran Lignans Containing Multiphenolic Groups, Titiruetai Doungwichitrkul Jan 2018

Synthesis And Antidiabetic Activity Of Furofuran Lignans Containing Multiphenolic Groups, Titiruetai Doungwichitrkul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Synthesis of furofuran lignans containing multiphenolic groups (6-12) was carried out. The starting material samin (5) was obtained by acid hydrolysis of sesamin (2), which was isolated from sesame seed oil. A series of target lignans were synthesized from samin (5) and a varity of phenolics through Friedel-Crafts reaction, yielding desired products (6). To increase number of hydroxy moieties on the synthesized lignans, oxidative reaction using lead (IV) tetraacetate was performed. Removal of methylenedioxy of furofuran lignans containing a phenolic moiety produced unexpected products which contains para-quinone together with ortho-dihydroxy moieties on furofuran core structures (8-9). Consequently, to avoid oxidation …

Go to article

Analysis And Optimum Design Of Cold-Formed Steel Arch Structures, Thu Huynh Van Jan 2018

Analysis And Optimum Design Of Cold-Formed Steel Arch Structures, Thu Huynh Van

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research presents the development of a unified framework for cold-formed steel warehouse design at variations of clear roof spans. The work involves the advanced finite element analyses of nonlinear arch-shape warehouse structures, namely one that considers 2nd-order nonlinear geometry effects-sufficiently accurate approximation of large deformation responses. An optimum design procedure of 3D arch steel warehouse structures is conducted with the help of a novel algorithm, called mixed ESO-PSO approach. The generic idea is based on the implementation of a well-known evolutionary structural optimization algorithm (ESO), and further integrates a mapping, underpinning particle swarm optimization (PSO), technique of design variables …

Go to article

The Effect Of Nac And Carnosine On Alzheimer’S Disease-Related In Vitro Model Through Rage-Age Signaling Pathway, Suphasarang Sirirattanakul Jan 2018

The Effect Of Nac And Carnosine On Alzheimer’S Disease-Related In Vitro Model Through Rage-Age Signaling Pathway, Suphasarang Sirirattanakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Alzheimer’s disease (AD) is the most common dementia which found increasing with age. It involves neurodegeneration which leads to various abnormalities especially memory loss, inability to learn new things, lack of creativity, lack of decision making ability, lack of critical thinking, calculation inability, inability to live normal daily life, inability to recognize person, time and place, emotional disturbance, and difficulty to use language. Since AD has severe impact in various aspects on both the patients and their families, so we are interested to study the neurodegenerative mechanism when neuronal cells are under oxidative stress which will induce neuroinflammation through the …

Go to article

A Hotel Hybrid Recommendation Method Based On Context-Driven Using Latent Dirichlet Allocation, Weraphat Nimchaiyanan Jan 2018

A Hotel Hybrid Recommendation Method Based On Context-Driven Using Latent Dirichlet Allocation, Weraphat Nimchaiyanan

Chulalongkorn University Theses and Dissertations (Chula ETD)

Recommender systems play an important role in helping users find items that they want. Normally, ratings are used in content-based filtering (CBF) and collaborative filtering (CF) for recommendation. However, only ratings are not enough for recommendation. Thus, contextual information, context driven and Latent Dirichlet Allocation (LDA) are used to improve recommendation. Also, the context of individual user has changed in the timeline (context-driven). In this work, a hotel hybrid recommendation method (CF+CBF) based on context-driven using LDA is proposed. Firstly, we find missing user ratings of user-hotel rating matrix by applying LDA on user ratings in order to get predicted …

Go to article

Using N-Alkane As A Proxy To Reconstruct Paleoenvironment In Thale Noi, Phatthalung Province, Assuma Sainakum Jan 2018

Using N-Alkane As A Proxy To Reconstruct Paleoenvironment In Thale Noi, Phatthalung Province, Assuma Sainakum

Chulalongkorn University Theses and Dissertations (Chula ETD)

Normal alkane (n-alkane) is the widely used hydrocarbon proxy for the paleoenvironmental study because of their specific characteristic and resistance to microbial degradation. The n-alkanes from the sediment cores TLN-CP5 and TLN-CP7 from Thale Noi, Phatthalung Province, were analyzed and subsequently compared with those derived from the recent plant samples. The plant samples were taken from mangrove forests, i.e. true mangrove, back mangrove, and mangrove associate, based on the previous study on pollen analysis. The n-alkane distributions, the average chain length (ACL), the carbon preference index (CPI) and the proportion of aquatic components (Paq) were further analyzed in order to …

Go to article

Effects Of Blood Contamination On Chemical Composition And Ion Releasing Of Calcium Silicate-Based Materials, Nareerat Thanavibu Jan 2018

Effects Of Blood Contamination On Chemical Composition And Ion Releasing Of Calcium Silicate-Based Materials, Nareerat Thanavibu

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study assessed the effects of blood contamination on the chemical composition and ion release of calcium silicate-based materials. ProRoot MTA (WMTA), Biodentine and TotalFill BC RRM putty (TRRM) were investigated. Materials were exposed to blood (blood-contaminated condition) or normal saline (non-blood-contaminated condition) for 24 hours. Three samples of each group were analysed for chemical composition using X-ray diffractometer and an energy-dispersive X-ray spectoscope with a scanning electron microscope after immersed in phosphate-buffered saline for 1, 7, 14 and 28 days. Five samples of each group were used to measure pH and ion release using a pH meter and inductively …

Go to article

Reclaiming Stolen Voices : An Indigenous, Region-Based Reading Of Leslie Marmon Silko’S Ceremony, Patricia Grace’S Potiki And Kiana Davenport’S Shark Dialogues, Krittaporn Reungwattanakul Jan 2018

Reclaiming Stolen Voices : An Indigenous, Region-Based Reading Of Leslie Marmon Silko’S Ceremony, Patricia Grace’S Potiki And Kiana Davenport’S Shark Dialogues, Krittaporn Reungwattanakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

This thesis aims to examine how contemporary indigenous writers reclaim their self-definition through the born-within, region-based perspectives in three novels: Leslie Marmon Silko's Ceremony (1977), Patricia Grace' Potiki (1986), and Kiana Davenport's Shark Dialogues (1998). It propounds that the three novels employ indigenous myths, knowledge, and epistemologies to present their modern indigenous culture, history and identity as distinct from mainstream Western stereotypical perceptions. These writers also suggest the necessity for hybridization of traditional culture in order for indigenous cultures to survive when it comes into contact with the global community. The three selected literary texts present integral roles of nature …

Go to article

Rethinking Inclusive And Sustainable Educational Development For Moken Children, Jason Sanglir Jan 2018

Rethinking Inclusive And Sustainable Educational Development For Moken Children, Jason Sanglir

Chulalongkorn University Theses and Dissertations (Chula ETD)

Despite numerous education readjustments, efforts for equal opportunity in education, and an increase in present enrollment, many indigenous children in Thailand continue to fall behind in the formal education system. This study focuses on the Moken Chao Lay (sea people) communities in southern Thailand and looks to analyze and understand situations and shortcomings of Moken children's education and why they are still underperforming in the formal education system. Traditional ways of knowing, especially knowing through nature, are used as a platform to rethink the way we look at indigenous children's education in Thailand. Interview data was collected from school teachers, …

Go to article

Selected Appropriate Decision Support Tool For Sustainable Rain-Fed Agriculture Referenced To The New Theory Of His Majesty King Bhumibol Adulyadej The Great: A Case Study Of Khao Wong District, Kalasin Province Of Thailand, Anutra Wannaviroj Jan 2018

Selected Appropriate Decision Support Tool For Sustainable Rain-Fed Agriculture Referenced To The New Theory Of His Majesty King Bhumibol Adulyadej The Great: A Case Study Of Khao Wong District, Kalasin Province Of Thailand, Anutra Wannaviroj

Chulalongkorn University Theses and Dissertations (Chula ETD)

Thailand is an agricultural country of which almost 80% of the total agricultural land is rain-fed. An on-farm pond, which is a self-reliant small-scale water source for harvesting the rainwater to be used for the whole year, becomes radical for farmers in this area. These farmers need to select the agricultural water management scheme which uses limited rainwater harvested in the on-farm pond efficiently and productively to fulfill their household needs, which will lead to sustainable rain-fed agriculture. Therefore, the study aimed to select an appropriate decision support tool for sustainable rain-fed agriculture referenced to the New Theory of His …

Go to article

Local Knowledge Framework For Sustainable Utilization Of Mangrove Forest : A Case Study Of Klong Khone Sub-District, Mueang District, Samut Songkhram Province, Thailand, Wipapan Adulcharoen Jan 2018

Local Knowledge Framework For Sustainable Utilization Of Mangrove Forest : A Case Study Of Klong Khone Sub-District, Mueang District, Samut Songkhram Province, Thailand, Wipapan Adulcharoen

Chulalongkorn University Theses and Dissertations (Chula ETD)

A development of local knowledge or local knowledge life cycle for locally appropriate sustainable utilization of mangrove ecosystem services was influenced by factors that were specific to ecological and social-cultural conditions and varied relying a change of the targeted mangrove ecosystem services for utilization. This study aims 1) to identify the factors in the local knowledge life cycle during two phases of mangrove stand initiation and young forest regrowth at Klong Khone sub-district, Samut Songkhram province, Thailand and 2) to propose the local knowledge framework for the sustainable utilization of mangrove ecosystem services and lessons learned through the local knowledge …

Go to article

Acclimatization And Application Of Biofilters For Nitrogen Removal In Marine Recirculating Shrimp Culture System, Penpicha Satanwat Jan 2018

Acclimatization And Application Of Biofilters For Nitrogen Removal In Marine Recirculating Shrimp Culture System, Penpicha Satanwat

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research involved in the complete nitrogen removal in marine recirculating aquaculture system (RAS) through sequential nitrification and denitrification processes using internal biofilter within a single tank. The study was divided into two experimental parts. The first study was to estimate the effects of salinity (5, 15 and 25 PSU) and stocking density (50 and 100 shrimp m-2) on nitrification and denitrification efficiencies, as well as on microbial diversity in the biofilm. Also, the nitrogen removal efficiencies of fibrous BiocordTM biofilter and Japanese filter mat were compared. Results showed that the nitrification was stimulated in low-salinity (5 PSU) system with …

Go to article

Heavy Metals Adsorption In Simulated Groundwater Using Iron Oxide Particles And Iron Oxide Coated Sand, Ramy Lun Jan 2018

Heavy Metals Adsorption In Simulated Groundwater Using Iron Oxide Particles And Iron Oxide Coated Sand, Ramy Lun

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aimed to understand adsorption mechanisms of single of heavy metals such as Mn, As and Fe and a combined heavy metal in simulated groundwater using iron oxide particles (IOP) and iron oxide coated sands (IOCS). The experiment was conducted in batch test. In order to understand mechanism of heavy metals adsorption, pseudo first-order and pseudo second-order of kinetic, and Langmuir and Freundlich isotherm models were applied by varying adsorbent dosages from 4 to 24 mg/L ,and 10 to 60 min of times. Optimal dosages for single heavy metals and a combined heavy metal removal were 12, 12, 20 …

Go to article

First Prev Next Last