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

Digital Commons Network™

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

2021

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 10291 - 10320 of 10798

Full-Text Articles in Entire DC Network

Physical Property And Biological Activity Of Bioscaffold Containing The Extracted Native Collagen And Acemannan On Proliferation And Growth Factor Secretion In Primary Human Pulpal Cells, Aye Aye Thant Jan 2021

Physical Property And Biological Activity Of Bioscaffold Containing The Extracted Native Collagen And Acemannan On Proliferation And Growth Factor Secretion In Primary Human Pulpal Cells, Aye Aye Thant

Chulalongkorn University Theses and Dissertations (Chula ETD)

Dental pulp tissue regeneration is based on tissue engineering concepts using stem cells, scaffolds, and growth factors to regenerate the pulp-dentine complex. Up to now, native collagen is commonly used as a biomaterial scaffold for tissue regeneration due to its biocompatibility, biodegradability, and properties that mimic the natural extracellular matrix (ECM). However, the bioactivity of collagen scaffold on cell growth and differentiation, and regenerative activities such as extracellular matrix formation and growth factor secretion which are important for pulp revascularization and regeneration and accomplishment root formation is still unclear. Many studies elucidated that adding biomolecules into the collagen scaffold enhanced …

Go to article

The Stress And Burnout Among Lecturers In The Universities With Online Teaching In Vietnam During Covid-19 Pandemic: A Cross-Sectional Study, Anh Hoang Thi Ngoc Jan 2021

The Stress And Burnout Among Lecturers In The Universities With Online Teaching In Vietnam During Covid-19 Pandemic: A Cross-Sectional Study, Anh Hoang Thi Ngoc

Chulalongkorn University Theses and Dissertations (Chula ETD)

During COVID-19 pandemic, the education system is one of many aspects in our life which is changed according to the effect of pandemic. Changing from traditional teaching method to new digital teaching method, may lead to adverse health effects directly to mental health of lecturers, including stress and burnout. This study aimed 1) to investigate the level of stress and burnout among lecturers in the universities in Vietnam during COVID-19 pandemic 2) to find the association among demographic, COVID-19 factors, difficulties in teaching online, and stress, burnout among tertiary education lecturers in Vietnam. This study was a cross-sectional study conducted …

Go to article

Effect Of Diamond Application On Dietary Intake And Bmi Among Over Nutrition Female College Student In Malang City, Indonesia: A Quasi-Experiment Study, Nurnaningsih Herya Ulfah Jan 2021

Effect Of Diamond Application On Dietary Intake And Bmi Among Over Nutrition Female College Student In Malang City, Indonesia: A Quasi-Experiment Study, Nurnaningsih Herya Ulfah

Chulalongkorn University Theses and Dissertations (Chula ETD)

Recently, using mobile applications for assisting weight loss programs is a common trend. However, the overnutrition rate is increasing every year. This research aims to develop and investigate the effect of Diet Monitoring (Diamond) application on dietary intake and BMI among overnutrition female college students in Malang City, Indonesia. Using 2 phases, this study used a cross-sectional study for phase I developing the app and a quasi-experiment for phase II investigating the effect of the application. 217 respondents were involved in phase I and 123 participants in phase II. The measurement tools were Tanita DC-360, and ZT-120 Health Scale, including …

Go to article

การเปรียบเทียบสมบัติเชิงกลของซิลิโคนอีลาสโตเมอร์ในงานบูรณะใบหน้าและขากรรไกร ก่อนและหลังได้รับพลังงานไมโครเวฟ, เพ็ญชนก แสนทวีสุข Jan 2021

การเปรียบเทียบสมบัติเชิงกลของซิลิโคนอีลาสโตเมอร์ในงานบูรณะใบหน้าและขากรรไกร ก่อนและหลังได้รับพลังงานไมโครเวฟ, เพ็ญชนก แสนทวีสุข

Chulalongkorn University Theses and Dissertations (Chula ETD)

วัตถุประสงค์ของงานวิจัยเพื่อศึกษาสมบัติเชิงกลของซิลิโคนอีลาสโตเมอร์ในงานประดิษฐ์ ใบหน้าและขากรรไกรชนิด VST-50 และ M511 ที ่ใส่เม็ดสีและไม่ใส่เม็ดสี ก่อนและหลังได้รับการ แช่ในน้ำที ่ทำให้ร้อนด้วยพลังงานจากเตาไมโครเวฟโดยจำลองการใช้เตาไมโครเวฟ 18 เดือน ชิ ้นงานตัวอย่าง 80 ชิ ้นต่อซิลิโคนแต่ละชนิด ทั ้งหมด 160 ชิ ้น จัดเป็น 2 กลุ ่มตามการเติมเม็ดสีคือ ชิ ้นงานที ่ไม่มีสีและชิ ้นงานมีสี โดยเป็นเม็ดสีชนิดซิลิโคน และแบ่งออกเป็นกลุ ่มควบคุมและกลุ ่มเข้า เตาไมโครเวฟ รูปร่างชิ ้นงานถูกขึ ้นรูปตามมาตรฐาน ASTM D412 และ D624 ทั ้งหมดมี 8 กลุ่ม ย่อย (n=10) ต่อซิลิโคนแต่ละชนิด การนำชิ ้นงานเข้าไมโครเวฟร่วมกับการแช่น้ำ เป็นเวลา 6 นาที ที่ 660 วัตต์ 18 ครั ้ง เป็นการจำลองการใช้งานเดือนละ 1 ครั ้ง อุณหภูมิของน้ำภายหลังการเข้า ไมโครเวฟคือ 60 องศาเซลเซียส จากการวิเคราะห์ความแปรปรวนแบบ 2 ทาง (a=.5) พบว่า ซิลิโคน VST-50 ชนิดของเม็ดสีมีผลต่อความทนต่อแรงดึงและความแข็งของชิ ้นงานซิลิโคนอย่างมี นัยสำคัญทางสถิติ (P<.001) ทั ้งกลุ ่มควบคุมและเข้าเตาไมโครเวฟ ขณะที ่การใช้เตาไมโครเวฟมีผล ต่อความทนต่อการฉีกขาดอย่างมีนัยสำคัญทางสถิติ (P<.05) ทั ้งกลุ ่มไม่มีสีและมีสี และทั ้งสอง ปัจจัยไม่มีผลต่อร้อยละการยืดตัว ขณะที ่ซิลิโคน M511 มีปฏิสัมพันธ์กันระหว่างปัจจัยการผสมเม็ด สีและการเข้าไมโครเวฟอย่างมีนัยสำคัญทางสถิติสำหรับความแข็ง (P<.05)

Go to article

Mercury And Selenium In Fishes From The Gulf Of Thailand:Balancing Consumption Risk, Irwan Ramadhan Ritonga Jan 2021

Mercury And Selenium In Fishes From The Gulf Of Thailand:Balancing Consumption Risk, Irwan Ramadhan Ritonga

Chulalongkorn University Theses and Dissertations (Chula ETD)

Consumption of marine fish, a high protein source, has been hampered by mercury (Hg) contamination. To date, selenium (Se), a co-occurrence element, has been perceived to reduce Hg toxicity. Health risk of Hg exposure via fish consumption might be re-estimated using Se-Hg connection. Total Hg (T-Hg) contamination in seafood was investigated in 60 individual (22, 4 and 6 species of fish, cephalopods and shellfish, respectively) purchased from two supermarkets in Bangkok and in 622 individuals (total 27 fish species) caught by bottom trawling from 63 stations in the Gulf Thailand (GoT). Se-Hg connection was studied in 19 selected fish species …

Go to article

Removal Of Ferrous And Arsenic From Contaminated Groundwater By Co-Precipitation Coupling With Membrane Separation Process, Bonita Pen Jan 2021

Removal Of Ferrous And Arsenic From Contaminated Groundwater By Co-Precipitation Coupling With Membrane Separation Process, Bonita Pen

Chulalongkorn University Theses and Dissertations (Chula ETD)

This work aimed to​ treat contaminated groundwater with arsenic and ferrous iron pollutants to be drinking water standard following by WHO by co-precipitation process and membrane separation process. The relative effect of different solid media types (scouring sponge, scouring pad, plastic ring, and activated carbon foam) and operating conditions on oxygen mass transfer coefficient (KLa) and hydrodynamic bubble parameters was studied. The optimization process of ferrous oxidation and arsenic removal was observed by Design of Experiment (DOE) with Central Composition Design of Response Surface Methodology (CCD-RSM). Lastly, separation process was experimented with conventional process and membrane technology, i.e., settling process, …

Go to article

Association Between Sensory Of Fingertip And Hand Function In Individuals With Stroke, Orisa Elfath Jan 2021

Association Between Sensory Of Fingertip And Hand Function In Individuals With Stroke, Orisa Elfath

Chulalongkorn University Theses and Dissertations (Chula ETD)

No abstract provided.

Go to article

Assessment Of Physicochemical Properties, Nutritional Values, And Sensory Acceptability Of Pigeon Pea Flour Substitution In Chapati Flat Bread, Sirin Sachanarula Jan 2021

Assessment Of Physicochemical Properties, Nutritional Values, And Sensory Acceptability Of Pigeon Pea Flour Substitution In Chapati Flat Bread, Sirin Sachanarula

Chulalongkorn University Theses and Dissertations (Chula ETD)

In recent years, an interest in plant–based protein increased dramatically. Pigeon pea (Cajanus cajan) is recognized as a good source of plant protein. The current study was aimed to develop pigeon pea flour (PPF) and whole wheat flour (WWF) blends, which were then used to make chapatis. The substitution levels of PPF for WWF ranged from 10%–40% w/w. The physical properties and nutritional values of the flour blends and the chapatis were investigated. The chapatis were also evaluated for sensory acceptability. Proximate analysis of the flours revealed protein content in PPF (26.10%) two times higher than that in WWF (13.52%). …

Go to article

The Association Of Reproductive Factors And Exogenous Hormone Use With Distal Sensory Neuropathy Among The Us Postmenopausal Women: Results From 1999–2004 Nhanes, Jiayu Li Jan 2021

The Association Of Reproductive Factors And Exogenous Hormone Use With Distal Sensory Neuropathy Among The Us Postmenopausal Women: Results From 1999–2004 Nhanes, Jiayu Li

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background: Distal sensory neuropathy is a common disorder in the peripheral nervous system. We aimed to investigate the association between reproductive history factors and distal sensory neuropathy among the US postmenopausal women aged 40 years and over. We also explored the heterogeneity of these associations by age. Methods: A cross sectional study was conducted with data from postmenopausal women aged 40 years and over in National Health and Nutrition Examination Survey 1999-2004. Women with diabetes, stroke, cancer, cardiovascular diseases, thyroid disease, liver disease, weak/failing kidneys, or amputation were excluded. Distal sensory neuropathy was measured via 10-gram monofilament test and all …

Go to article

การศึกษาประสิทธิผลของการให้ยาเมนาควิโนน-7 ต่อภาวะการแข็งตัวของหลอดเลือดแดงในผู้ป่วยโรคไตเรื้อรังที่ได้รับการฟอกเลือดด้วยเครื่องไตเทียม: งานวิจัยเชิงทดลองแบบสุ่ม, นวลจันทร์ทิพย์ นัยรักษ์เสรี Jan 2021

การศึกษาประสิทธิผลของการให้ยาเมนาควิโนน-7 ต่อภาวะการแข็งตัวของหลอดเลือดแดงในผู้ป่วยโรคไตเรื้อรังที่ได้รับการฟอกเลือดด้วยเครื่องไตเทียม: งานวิจัยเชิงทดลองแบบสุ่ม, นวลจันทร์ทิพย์ นัยรักษ์เสรี

Chulalongkorn University Theses and Dissertations (Chula ETD)

ที่มา: ภาวะพร่องวิตามินเคในเลือดถือเป็นความเสี่ยงที่สำคัญต่อการเกิดภาวะแคลเซียมเกาะผนังหลอดเลือดและนำไปสู่ภาวะหลอดเลือดแดงแข็งสูญเสียความยืดหยุ่นในผู้ป่วยโรคไตเรื้อรังและผู้ป่วยที่ได้รับการบำบัดทดแทนไต อย่างไรก็ตามประโยชน์ของการให้วิตามินเคเสริมต่อโครงสร้างและหน้าที่ความแข็งแรงสมบูรณ์ของหลอดเลือดนั้นยังเป็นเรื่องที่ถกเถียงกันในวงกว้างและยังต้องการหลักฐานงานวิจัยสนับสนุนเพิ่มเติม การศึกษานี้จึงถูกจัดทำขึ้นเพื่อศึกษาประสิทธิผลของการให้วิตามินเคหรือยาเมนาควิโนน-7ต่อการดำเนินของภาวะหลอดเลือดแดงแข็งในผู้ป่วยไตเรื้อรังที่ได้รับการฟอกเลือดด้วยเครื่องไตเทียม กระบวนการและระเบียบวิธีวิจัย: เป็นการศึกษาทดลองแบบสุ่มในพหุสถาบันชนิดมีกลุ่มควบคุม จัดทำขึ้นในศูนย์ไตเทียม 4 แห่งในจังหวัดกรุงเทพมหานคร ประเทศไทย โดยรวบรวมผู้ป่วยไตเรื้อรังที่ได้รับการฟอกเลือดด้วยเครื่องไตเทียมทั้งหมด 96 คนซึ่งมีภาวะหลอดเลือดแดงแข็งรุนแรงจากการประเมิน carotod-femoral pulse wave velocity (cfPWV ≥ 10 เมตรต่อวินาที) เข้ามาในการศึกษา โดยผู้ป่วยที่เข้าร่วมในการศึกษาจะได้รับการสุ่มแบ่งออกเป็น 2 กลุ่มการศึกษา ได้แก่ กลุ่มรักษาที่ได้รับยาเมนาควิโนน-7 (ขนาด 375 ไมโครกรัมต่อวัน) ในระยะเวลา 24 สัปดาห์ (n=50) และกลุ่มควบคุมที่ไม่ได้รับยาเมนาควิโนน-7 (n=46) โดยผลลัพธ์หลักของการศึกษาคือการเปลี่ยนแปลงของภาวะหลอดเลือดแดงแข็งวัดด้วย cfPWV ระหว่างและหลังการรักษา ผลการศึกษา: ผู้ป่วยที่เข้าร่วมในงานวิจัย 96 คนมีข้อมูลพื้นฐานไม่แตกต่างกันในทั้งสองกลุ่ม ระหว่างการรักษาที่ 12 สัปดาห์พบว่า ผู้ป่วยในกลุ่มรักษาที่ได้รับยาเมนาควิโนน-7 มีแนวโน้มของภาวะหลอดเลือดแดงแข็งที่ดีขึ้นเมื่อเทียบกับกลุ่มควบคุม (-13.0 ± 20.7% vs -6.8 ± 21.1%, p=0.18) เมื่อวิเคราะห์ในกลุ่มย่อยพบว่า กลุ่มรักษาที่มีภาวะเบาหวานร่วมด้วยมีการลดลงของภาวะหลอดเลือดแดงแข็งที่มากยิ่งขึ้นเมื่อเทียบกับกลุ่มควบคุมที่มีภาวะเบาหวานร่วมด้วย (-9.9±13.8% vs 1.9±17.2%, p = 0.065) นอกจากนี้ผลการศึกษายังแสดงให้เห็นว่า ผู้ป่วยในกลุ่มรักษามีการดำเนินของภาวะหลอดเลือดแดงแข็งน้อยกว่ากลุ่มควบคุมเมื่อตรวจติดตามค่า cfPWV ที่ 12 สัปดาห์ (21.4% vs 34.1%, p = 0.20) โดยเฉพาะผู้ป่วยที่มีภาวะเบาหวานร่วมด้วยเช่นกัน (21.4% vs 58.3%, p = 0.054) ทั้งนี้ระหว่างการศึกษาที่ 12 สัปดาห์ยังไม่พบรายงานยาเมนาควิโนน-7ก่อให้เกิดผลข้างเคียงร้ายแรงต่อผู้ป่วยในงานวิจัยนี้ สรุปผลการศึกษา: การให้ยาเมนาควิโนน-7 รับประทานเสริมขนาด 375 ไมโครกรัมต่อวัน ในระยะเวลา 24 สัปดาห์พบว่า มีแนวโน้มในการลดภาวะหลอดเลือดแดงแข็งจากการวัดด้วย cfPWV ในผู้ป่วยไตเรื้อรังที่ได้รับการฟอกเลือดด้วยเครื่องไตเทียม:7 ซึ่งผลลัพธ์เดียวกันนี้ชัดเจนยิ่งขึ้นในผู้ป่วยที่ภาวะเบาหวานร่วมด้วย อย่างไรก็ตามควรมีการศึกษาเพิ่มเติมในแง่ผลลัพธ์ทางคลินิกของระบบไหลเวียนโลหิตและหัวใจเพิ่มเติมในอนาคต

Go to article

A Causal Model For The Quality Of Nursing Work Life Among Professional Nurses In Public Hospitals, Thailand, Pattaramon Tubsoongnoen Jan 2021

A Causal Model For The Quality Of Nursing Work Life Among Professional Nurses In Public Hospitals, Thailand, Pattaramon Tubsoongnoen

Chulalongkorn University Theses and Dissertations (Chula ETD)

This cross-sectional study aimed to develop and test causal relationships between transformational leadership, job characteristics, organizational climate, job satisfaction, and quality of nursing work life among professional nurses in Thailand. The hypothesized model was conducted based on Kanter’s theory of structural empowerment. A multi-stage sampling technique was utilized to recruit 392 Thai professional nurses from 22 hospitals who met the inclusion criteria. Research instruments consisted of demographic data form, Multifactor Leadership Questionnaire, Job Content Questionnaire, Organizational Climate Questionnaire, Nurses’ Job Satisfaction Scale, and the Thai version of Brooks’ Quality of Nursing Work Life survey. The validity of all instruments was …

Go to article

Safety Behaviour In Pesticide Use And Disposal Among Nigerian Cocoa Farmers, Oluseye Olalekan Oludoye Jan 2021

Safety Behaviour In Pesticide Use And Disposal Among Nigerian Cocoa Farmers, Oluseye Olalekan Oludoye

Chulalongkorn University Theses and Dissertations (Chula ETD)

Nigerian cocoa farmers are indiscriminately using and disposing pesticides in a manner that poses danger to their health and the environment. Thus, sequential explanatory mixed methods design was used to explore personal and environmental determinants of pesticide safety and disposal behaviours among the farmers. Using face-to-face interviews, 391 cocoa farmers were interviewed based on a reliable and valid questionnaire consisted of the health belief model (HBM), disposal practices and sociodemographic questions. In the qualitative phase, in-depth interviews were conducted among 23 cocoa farmers and 34 relevant stakeholders to further explore the factors influencing safe pesticide use and disposal using the …

Go to article

Functional Characterization Of Rice Malate Synthase In Arabidopsis Responding To Salt Stress, Supisara Thanabut Jan 2021

Functional Characterization Of Rice Malate Synthase In Arabidopsis Responding To Salt Stress, Supisara Thanabut

Chulalongkorn University Theses and Dissertations (Chula ETD)

Salt stress is one of the major abiotic stresses that seriously limit plant growth and development and can lead to a significant reduction in crop yield, especially rice. Salt stress affects plants via ionic toxicity and osmotic stress. Osmotic stress results in a reduction of water absorption ability. Ionic toxicity causes Na+ toxicity, which disrupts photosynthesis, protein synthesis, and enzyme activity. The previous study of KDML105 rice transcriptome profile and qRT-PCR revealed that rice malate synthase (OsMS) encoding malate synthase, which is one of the key enzymes in glyoxylate cycle was up-regulated under salt stress, so OsMS may involve in …

Go to article

Development Of A Device For Postural Change While Sitting For The Prevention Of Neck Or Low Back Pain In Office Workers, Nipaporn Akkarakittichoke Jan 2021

Development Of A Device For Postural Change While Sitting For The Prevention Of Neck Or Low Back Pain In Office Workers, Nipaporn Akkarakittichoke

Chulalongkorn University Theses and Dissertations (Chula ETD)

The objective of this thesis was to develop a device for postural change while sitting for the prevention of neck or low back pain in office workers. This thesis was divided into four stages: 1) to evaluate the effects of postural shifting frequency on perceived musculoskeletal discomfort during 1 hour of sitting in healthy office workers; 2) to evaluate the effects of the postural shift intervention on the 12-month incidence of the onset of neck and low back pain in high-risk office workers; 3) to investigate the efficacy of postural shift interventions on recovery duration and recurrence of neck and …

Go to article

Epidemiology, Molecular Genetic, And Evolutionary Analysis Of Humanrotavirus A Infection In Thailand, Fajar Budi Lestari Jan 2021

Epidemiology, Molecular Genetic, And Evolutionary Analysis Of Humanrotavirus A Infection In Thailand, Fajar Budi Lestari

Chulalongkorn University Theses and Dissertations (Chula ETD)

Rotavirus A (RVA) infection remains one of the major causes of viral diarrhea in young children worldwide. Despite the success of RVA vaccines including RotaTeq in significantly reducing morbidity and disease severity associated with hospitalization, national immunization against RVA have only just begun in Thailand in 2020. Consequently, possible RV vaccine shedding among pediatric vaccine recipients has not been rigorously documented here.The first part of my study was summarize the virology, disease burden, prevalence, distribution of genotypes and seasonality of RVs, and the current status of RV vaccination in Southeast Asia (Cambodia, Indonesia, Lao People’s Democratic Republic, Malaysia, Myanmar, Philippines, …

Go to article

Identification Of Α-Glucosidase Inhibitors From Black Garlic, Pattraporn Tantiwatcharachai Jan 2021

Identification Of Α-Glucosidase Inhibitors From Black Garlic, Pattraporn Tantiwatcharachai

Chulalongkorn University Theses and Dissertations (Chula ETD)

Black garlic has emerged as one of the fastest-growing health food products on the market. It is processed by incubating fresh garlic under high temperature and high humidity conditions. The process causes the changes in characteristics of black garlic such as texture, flavor, nutrient contents, chemical composition and it pharmacological properties, especially antidiabetic activity. In the present investigation, we applied α-glucosidase inhibition guided isolation to identify active compounds. Four compounds named 5-hydroxymethylfurfural (5-HMF), 5-hydroxymethyl-2-furancarboxylic acid (HMFCA), 4-(hydroxymethyl)phenol and 2-deoxy-ribono-1,4 lactone were isolated. On evaluation against α-glucosidase, HMFCA, 4-(hydroxymethyl)phenol, and 2-deoxy-ribono-1,4 lactone were active against maltase with IC50 values of 18.83 …

Go to article

Chemical Constituents Of Fan-Si Abutilon Indicum Stems, Arum Restu Widyasti Jan 2021

Chemical Constituents Of Fan-Si Abutilon Indicum Stems, Arum Restu Widyasti

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aimed to isolate secondary metabolites from the stems of Abutilon indicum and to evaluate their α-glucosidase, pancreatic lipase, α-chymotrypsin inhibitory activity. Chromatographic fractionation of the n-hexane crude extracts led to the isolation of three known metabolite (1-3). The crude extract from all parts of the plant were evaluated for inhibitory activity on the alpha-glucosidase enzyme. The DCM-soluble roots were active with 10.2% at 25 μg/mL. The hexane and MeOH-soluble stems were active with 11.0% at 25 μg/mL and 8.0% at 0.25 μg/mL. The hexane, DCM, and MeOH-soluble leaves are active with 20.2% at 0.025 μg/mL; 20.0% at 0.025 …

Go to article

Thin-Layer Chromatography For Determination Of Phenolic Compound Profile And Antioxidant Activity Of Thai Honey, Pattraporn Chobpradit Jan 2021

Thin-Layer Chromatography For Determination Of Phenolic Compound Profile And Antioxidant Activity Of Thai Honey, Pattraporn Chobpradit

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this study, a small-scale method using thin-layer chromatography (TLC) was developed to determine profile and antioxidant activity value of Thai honey samples obtained from different flora sources. Prior to TLC analysis, the samples were prepared by solvent extraction with dichloromethane. Using 2, 2-diphenyl-1-picrylhydrazy radical (DPPH•) reacted with the samples extract prior to TLC spot and color detection with imageJ, half-maximal inhibitory concentration (IC50) values of seven honey samples was obtained in a range of 9 to 22 mg/mL in comparison with IC50 values of 0.13 mg/mL for L-ascorbic acid (LA), along with limit of detection (LOD) and limit of …

Go to article

Discrimination Of Weedy Rice By Using Near-Infrared Spectroscopy Combined With Chemometrics, Sureerat Makmuang Jan 2021

Discrimination Of Weedy Rice By Using Near-Infrared Spectroscopy Combined With Chemometrics, Sureerat Makmuang

Chulalongkorn University Theses and Dissertations (Chula ETD)

Weedy rice is one of the most notorious weeds occurring in rice-growing areas, especially in South-East Asia. Weedy rice especially in form of paddy seed is difficult to manage and separate as they provide common features (morphological resemblance) to cultivated rice. This work presents a modification of self-organizing map (SOMs) for the classification of weedy rice from cultivated rice via in situ direct sample analysis from paddy seed using near-infrared (NIR) spectroscopy and hyperspectral NIR camera. The sample pretreatment was carried out by a cyclone vacuum machine to remove the contaminated particles and other impurities. The physical characteristics and the …

Go to article

Developing A System Of Community-Based Agritourism For Sustainable Local Food Systems: A Multi-Case Study Of Rural Livelihood Diversification And Sustainable Urban Consumption In City-Regional Bangkok, Sofia Anna Enrica Cavalleri Jan 2021

Developing A System Of Community-Based Agritourism For Sustainable Local Food Systems: A Multi-Case Study Of Rural Livelihood Diversification And Sustainable Urban Consumption In City-Regional Bangkok, Sofia Anna Enrica Cavalleri

Chulalongkorn University Theses and Dissertations (Chula ETD)

Current food systems fail to directly link rural producers and urban consumers. This research explores and categorizes emerging community-based agritourism practices as strategies to reconnect rural food producers with urban consumers. The main research question of this study is: how can community-based agritourism link rural food producers and urban consumers as a rural livelihood diversification strategy? Mixed methods for data collection were selected to answer this question and analyzed with a deductive and inductive approach. These include the review of secondary grey and academic literature, shadow observation in three rural provinces, content validity index calculation performed by experts (n = …

Go to article

Solid-State Modification Of Tapioca Starch Using Non-Thermal Plasma, Natchanon Srangsomjit Jan 2021

Solid-State Modification Of Tapioca Starch Using Non-Thermal Plasma, Natchanon Srangsomjit

Chulalongkorn University Theses and Dissertations (Chula ETD)

The objective of this research was to investigate the physical, chemical, and functional properties of tapioca starch subjected to solid-state modification by using nonthermal dielectric barrier discharge (DBD) plasma treatment using different gases (helium and argon), voltage levels (10 kV and 15 kV), and treatment times (5, 10, and 15 minutes). After treatment, an increase in L* value and a marginal decrease in pH value of all treated samples were noted. Scanning electron micrographs showed dented starch granules after the plasma treatment but showed birefringence. From XRD measurement, all samples showed a characteristic C-type diffraction pattern but a reduction in …

Go to article

The Effectiveness Of Asiaticoside On Osteogenic Differentiation Ability In Aging Human Periodontal Ligament Cells In Vitro, Adisa Suthirathikul Jan 2021

The Effectiveness Of Asiaticoside On Osteogenic Differentiation Ability In Aging Human Periodontal Ligament Cells In Vitro, Adisa Suthirathikul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Retaining teeth is essential for the quality of life of the aging population. However, aging has biological effects in periodontal ligament cells with significant changes in their proliferative rate and regenerative function. Asiaticoside, extracted from Centella asiatica, was found to have potential in osteogenic differentiation and mineralization in human periodontal ligament cells (HPDLCs). The aim of this study is to investigate the effect of asiaticoside on the aging HPDLCs osteogenic differentiation and mineralization. Aging HPDLCs, retrieved from patients age 60 and above, were confirmed aging status using Senescence-Associated ß -Galactosidase assay. The cells were incubated with various concentrations of asiaticoside …

Go to article

Changes In Surface Water And Sediment Quality At A Complex Tidal-Influenced River: A Case Study Of Ganh Hao River, Mekong Delta, Vietnam, Muoi Le Van Jan 2021

Changes In Surface Water And Sediment Quality At A Complex Tidal-Influenced River: A Case Study Of Ganh Hao River, Mekong Delta, Vietnam, Muoi Le Van

Chulalongkorn University Theses and Dissertations (Chula ETD)

The research was carried out to determine the extent of surface water and sediment pollution using the physicochemical parameters and heavy metal concentrations. The surface water and sediment samples were obtained from 25 sites along the river on March 22 and September 5, 2019 at the main river influenced by the complex tidal regime and aquaculture practices in Ca Mau peninsular in the Vietnamese Mekong Delta. The water quality was compared with international and national standards, while the sediment quality was compared with Vietnamese standards and pollution indices (geo-accumulation index, contamination factor, and pollution load index). Principal component analysis (PCA) …

Go to article

Health Risk Assessment Of Toxic Metals In Commonly Consumed Salad Leafy Vegetables In Bangkok, Zin Htoo Hlyan Jan 2021

Health Risk Assessment Of Toxic Metals In Commonly Consumed Salad Leafy Vegetables In Bangkok, Zin Htoo Hlyan

Chulalongkorn University Theses and Dissertations (Chula ETD)

The objectives of this study were 1) to investigate concentrations of toxic metals including As, Cd, and Pb in the commonly consumed salad leafy vegetables which were sold in Bangkok, and 2) to assess potential human health risks of As, Cd, and Pb exposure via salad leafy vegetables consumption. A total of 120 samples were randomly collected from local fresh markets in Bangkok. The total concentrations of toxic metals were determined by an inductively coupled plasma mass spectroscopy (ICP-MS). Total concentrations of As, Cd and Pb in coral lettuce (CL), red coral (RC) and green oak (GO) for soil cultivation …

Go to article

The Application Of Machine Learning In Clustering Borderline Mild Cognitive Impairment Among Aging Thai People Living With Hiv, Akarin Hiransuthikul Jan 2021

The Application Of Machine Learning In Clustering Borderline Mild Cognitive Impairment Among Aging Thai People Living With Hiv, Akarin Hiransuthikul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Many people living with HIV (PLWH) have cognitive impairment. Details of cognitive impairment subtypes are lacking. Unsupervised machine learning (ML) can reveal hidden subgroups within heterogeneous data. The study aimed to determine clusters of aging Thai PLWH with borderline cognitive impairment using unsupervised ML. HIV-NAT 207 study enrolled Thai PLWH aged ≥50 years. Cognitive performance was evaluated by the Thai-validated Montreal Cognitive Assessment (MoCA). This study included participants who scored between 23 and 27. The score of each cognitive domain served as cluster variables for the K-means algorithm. Among 340 PLWH, 177 (52.1%) scored between 23 and 27. Median age …

Go to article

Analysis Of Inventory In A Food Repackaging Company, Chutipapha Thiantravan Jan 2021

Analysis Of Inventory In A Food Repackaging Company, Chutipapha Thiantravan

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research aims to evaluate the nature of business and apply a suitable inventory policy to a case study food-repackaging company. The company adopted bulk-purchasing to packaging inventory to realize the economy of scales. Because of the lacks of purchasing standard and monitoring, this inventory policy led to the overstock, deadstock, and obsolete packaging inventories as well as the fluctuation of inventory turnover rate. The further category analysis of the packaging inventories using ABC analysis reveals that special customized bags and packaging items have a long lead time due to international sourcing and high minimum order quantity (MOQ). As a …

Go to article

Spray Dried Asiatic Acid-Palm Oil Nanoemulsion With Improved Characteristics And Antihypertensive Effect Study In Rat Model Of Hypertension, Aditya Trias Pradana Jan 2021

Spray Dried Asiatic Acid-Palm Oil Nanoemulsion With Improved Characteristics And Antihypertensive Effect Study In Rat Model Of Hypertension, Aditya Trias Pradana

Chulalongkorn University Theses and Dissertations (Chula ETD)

Hypertension is a risk factor for premature death worldwide.It is characterized by an increase in blood pressure, so it needs therapy to regulate it and keep the value normal. Asiatic acid (AA) and palm oil (PO) were alternative antihypertensive agents that were promising to be developed. Both were natural compounds obtained from the Centella asiatica and Elaesis guineensis plants. However, low solubility, low absorption, rapid metabolism, low bioavailability and high oxidation were the limitation for both of them as an active compounds. Thus, a combination of nanoemulsion formulation and drying with a spray dryer was necessary to improve the physicochemical …

Go to article

Assessments Of Chromium Pollution In Surface Sediment Of The Inner Gulf Of Thailand, Patcha Leelakun Jan 2021

Assessments Of Chromium Pollution In Surface Sediment Of The Inner Gulf Of Thailand, Patcha Leelakun

Chulalongkorn University Theses and Dissertations (Chula ETD)

The inner Gulf of Thailand is an important marine resource for economic and social developments of Thailand. Moreover, the inner Gulf of Thailand is a diverse of biological coastal ecosystem, which is make an equilibrium marine environment. On the other hand, this area is due mainly to a variety of pollutant sources from the surface runoff, particularly major large rivers including the Mae Klong, the Tha Chin, the Chao Phraya and the Bangpakong Rivers. As a result, chromium contamination can occur in the inner Gulf of Thailand and ultimately become a serious environmental issue in Thailand. Therefore, the surface sediments …

Go to article

Influence Of Seasonal Variations On Contamination Level And Ecological Risk Of Heavy Metals In The Surface Sediments Of The Inner Gulf Of Thailand, Phuttiphat Lapat-Atiwat Jan 2021

Influence Of Seasonal Variations On Contamination Level And Ecological Risk Of Heavy Metals In The Surface Sediments Of The Inner Gulf Of Thailand, Phuttiphat Lapat-Atiwat

Chulalongkorn University Theses and Dissertations (Chula ETD)

The Inner Gulf of Thailand is a marine resource that provides ecological and economic value. Meanwhile, its can be acted like pollutions sink, especially heavy metals. After that, the extensions of industrialization, agriculturalization, and urbanization can degenerate to the inner Gulf environment quality. Therefore, this thesis was aimed to study the spatial distribution and seasonal variation of heavy metal concentration (Cd, Pb, Cu, Co, Ni, Mn and Zn) in surface sediment including the Mae Klong, the Tha Chin, the Chao Phraya and the Bangpakong River estuaries. Moreover, the contamination status and ecological risk were also evaluated. The results shown the …

Go to article

Investigation Of Copper And Zinc Contaminations In Bioponic Systems Using Chicken Manure Fertilizer, Satja Aksorn Jan 2021

Investigation Of Copper And Zinc Contaminations In Bioponic Systems Using Chicken Manure Fertilizer, Satja Aksorn

Chulalongkorn University Theses and Dissertations (Chula ETD)

The bioponic system is a system that utilizes biological waste as a nutrient-rich source such as chicken manure fertilizer for plant growth integrated with aquaponic. At present, chicken manure fertilizer is contaminated with Cu and Zn may have the potential health effects through vegetable consumption. The objective of this study was to evaluate nitrogen transformation, nitrogen recovery, and plant growth in chicken manure-based bioponics at Cu (50–150 mg/kg) and Zn (200–600 mg/kg) supplementation and investigate the effects of Cu and Zn supplementations on plant bioaccumulation, root microbial community, and dietary health risk. Cu and Zn concentrations were analyzed using inductively …

Go to article

First Prev Next Last