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    Adaptive responses of Jerusalem artichoke to mid-season drought: effects on phenolic compounds and p-coumaric acid content
    (2025-12-01)
    Ruttanaprasert, Ruttanachira
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    Jogloy, Sanun
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    Janket, Anon
    ;
    Siripipatthana, Patthraporn
    ;
    Senawong, Thanaset
    Background: Drought stress can influence the accumulation of phenolic compounds in plants. This study investigated the adaptive response of Jerusalem artichoke to mid-season drought stress, focusing on changes in total phenolic content and p-coumaric acid contents. Methods: A pot experiment was conducted using a 2 × 5 factorial arrangement in a randomized complete block design with three replications. Factor A comprised two irrigation treatments: field capacity (FC) and mid-season drought stress (maintaining 50% available soil water [50% AW] from 31 to 60 days after transplanting). Factor B included five Jerusalem artichoke genotypes with varying levels of drought resistance: JA 3, JA 125, JA 15, JA 89, and CN52867. Results: Mid-season drought significantly decreased leaf relative water content at 60 days after transplanting of Jerusalem artichoke in both years (73.2% in year 1 and 74.2% in year 2). Drought significantly affects total phenolic content in leaf and stem at 90 DAT but does not affect TPC in tuber. Genotype JA 125 showed high total phenolic content under drought conditions in leaf (38.3 mg GAE/g dry weight), stem (24.3 mg GAE/g dry weight) and tuber (9.0 mg GAE/g dry weight), especially in the second year. The JA3 genotype showed stability for increased accumulation of total phenolic contents under drought stress and this genotype also accumulated the highest p-coumaric acid (15.4 mg GAE/g dry weight) under drought stress. These findings highlight the potential of Jerusalem artichoke as a source of bioactive compounds and these genotypes can serve as breeding sources to enhance the drought resistance and high phenolic content of Jerusalem artichoke.
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    Changes in Pulse Transit Time during Psychological Stress Test
    (2018-07-02)
    Chuenchom, Thanapat
    ;
    Tretriluxana, Suradej
    ;
    Chitsakul, Kitiphol
    Preliminary study of psychological stress on physiological parameters has been reported. Six healthy college students (male=3, female=3) participated in the modified Trier Social Stress Test (TSST). Their Electrocardiogram (ECG), Photoplethysmogram (PPG) were monitored in 5-stage experiment. Two Pulse Transit Time (PTT) were generated within each cardiac cycle from the period of R-wave presented in ECG to (1) the peak (systolic pressure) in PPG; 'PTT+' and (2) the valley (diastolic pressure) in PPG; 'PTT-'. The mean and standard deviation of these two PTTs were reported across the stages. More data will be recruited for statistical comparison in the future.
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    Finite element analysis of dental implant prosthetics
    (2018-01-01)
    Aumnakmanee, Suchat
    ;
    Yodpiji, Nantakrit
    ;
    Jantong, Nattawut
    ;
    Jongprasithporn, Manutchanok
    The paper presents the engineering analysis on stress characteristics of dental implant prosthetics. This research project focuses on a static simulation for dental implant using the three-dimensional finite element. Effects of four different Thread designs (Buttress Thread - US20140370459A1, Trapezoidal Thread - US20140212844A1, Reverse Buttress Thread - US20140816800A1 and a New Design) of dental implant prosthetics on stress are tested at four different areas (Abutment, Implant, Cortical Bone, and Cancellous Bone). Compressive forces, ranging from 60 to 200 N and Sheer force of 20 N with the force angle of 60°are applied to the dental implant models. Outcomes from this research project provide a better understanding of stress distribution characteristics that would be used for an improved design of dental implant Threads.