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    PublicationOpen Access
    A comparative study of the cemental surfaces of teeth with and without periodontal diseases by scanning electron microscopy.
    (2014-09) Ratthapong Worawongvasu; รัฐพงษ์ วรวงศ์วสุ; Ratthapong Worawongvasu; รัฐพงษ์ วรวงศ์วสุ; Mahidol University. Faculty of Dentistry. Department of Oral and Maxillofacial Pathology
    uneven pebbly. The cemental surfaces appeared as numerous low confluent mounds or dish-topped projections and were covered by irregular, thin and sheet-like deposits. Discrete clusters of spherical mineral particles were distributed over the surfaces...Objectives: The purpose of this study was to compare the cemental surfaces of normal teeth with those of teeth with periodontitis by scanning electron microscopy. Materials and methods: Five normal premolars and 5 premolars with periodontitis
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    PublicationOpen Access
    Biosynthesis of Silver Nanoparticles Using Orange Peel Extract for Application in Catalytic Degradation of Methylene Blue Dye
    (2021) Cathleen Simatupang; Vinod K Jindal; Ranjna Jindal; Mahidol University. Faculty of Engineering. Department of Civil and Environmental Engineering; Mahidol University. Faculty of Engineering. Department of Chemical Engineering
    Interest in the biosynthesis of silver nanoparticles (AgNPs) has been steadily increasing primarily due to their numerous applications in various fields, low-cost, use of non-toxic environmentally-friendly materials and easy implementation... wavelength of 403.8 nm in UV-vis spectra, and minimum particle size of 12.9 nm. In addition, peak absorbance and SPR wavelength appeared to be related to the size of the AgNPs. A full-factorial design for the catalytic degradation of MB dye
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    PublicationOpen Access
    Effective properties of piezoelectric fiber-reinforced composites with imperfect interface
    (2017-03-01) Yasothorn Sapsathiarn; Rattanan Tippayaphalapholgul; Teerapong Senjuntichai; Mahidol University; Chulalongkorn University
    with imperfect fiber-matrix interface bonding conditions. The micromechanics analysis is based on the periodic microfield micromechanics theory and the boundary element method (BEM). The imperfect bonding between the piezoelectric fibers and matrix is taken... into account and represented by a spring-factor parameter. Selected numerical results are presented to show the influence of fiber-volume fraction, material properties of fiber and matrix, and interface bonding conditions on the effective properties
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    PublicationOpen Access
    Blood cockle shell: an agro-waste for N and P removal of shrimp farm effluent
    (2013-06) Mothinee Aopreeya; Chumlong Arunlertaree; Chumporn Yuwaree; Rattana Boonprasert; Rungjarat Hutacharoen; Rungjarat Hutacharoen; Mahidol University. Faculty of Environment and Natural Resource Studies
    ) blood cockle shell (grinding, NBCS). All shell types (BBCS, NBCS) performed well as adsorbents The removal efficiency varied with shell particle size and effluent flow rate. The shell particle size of BBCS at 0.85-2.0 millimeters had the highest... and Teller method: BET) produced more N and P removal efficiency than the lower one as NBCS.
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    PublicationOpen Access
    Discovery and partial characterization of a non- LTR retrotransposon that may be associated with abdominal segment deformity disease (ASDD) in the whiteleg shrimp Penaeus (Litopenaeus) vannamei
    (2013) Waraporn Sakaew; Benjamart Pratoomthai; Pattira Pongtippatee; Flegel, Timothy W.; Boonsirm Withyachumnarnkul; Mahidol University. Faculty of Science. Department of Anatomy
    . It is associated with the presence of viral-like particles seen by electron microscopy in the ventral nerve cords of affected shrimp. Thus, shotgun cloning was carried out to seek viral-like sequences in affected shrimp. Results: A new retrovirus-like element... terminal repeat (non-LTR) retrotransposons (called the NLRS sub-domain). No single amplicon of 5 kb containing both these elements was obtained by PCR or RT-PCR from ASDD shrimp. Subsequent analysis indicated that PENS and NLRS were not contiguous
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    PublicationOpen Access
    Permeability changes of integrin-containing multivesicular structures triggered by picornavirus entry.
    (2014-10-09) Pan Soonsawad; แพน สุ่นสวัสดิ์; Wattana Weerachatyanukul; วัฒนา วีรชาติยานุกูล; Paavolainen, Lassi; Upla, Paula; Rintanen, Nina; Espinoza, Juan; McNerney, Gregory; Marjomäki, Varpu; Cheng, R. Holland; Mahidol University. Faculty of Dentistry. Department of Anatomy
    Cellular uptake of clustered α2β1-integrin induces the formation of membrane compartments that subsequently mature into a multivesicular body (MVB). Enhanced internalization mediated by clustered integrins was observed upon infection by the picornavirus echovirus 1 (EVI). We elucidated the structural features of virus-induced MVBs (vMVBs) in comparison to antibody-induced control MVBs (mock infection) by means of high-pressure cryo fixation of cells followed by immuno electron tomography during early entry of the virus. Three-dimensional tomograms revealed a marked increase in the size and complexity of these vMVBs and the intraluminal vesicles (ILVs) at 2 and 3.5 hours post infection (p.i.), in contrast to the control MVBs without virus. Breakages in the membranes of vMVBs were detected from tomograms after 2 and especially after 3.5 h suggesting that these breakages could facilitate the genome release to the cytoplasm. The in situ neutral-red labeling of viral genome showed that virus uncoating starts as early as 30 min p.i., while an increase of permeability was detected in the vMVBs between 1 and 3 hours p.i., based on a confocal microscopy assay. Altogether, the data show marked morphological changes in size and permeability of the endosomes in the infectious entry pathway of this non-enveloped enterovirus and suggest that the formed breakages facilitate the transfer of the genome to the cytoplasm for replication.
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    PublicationOpen Access
    A novel hybridized metaheuristic technique inenhancing the diagnosis of cross-sectional dentdamaged offshore platform members
    (2019) Wonsiri Punurai; M.S. Azad; Nantiwat Pholdee; Sujin Bureerat; Chana Sinsabvarodom; Mahidol University. Faculty of Engineering. Department of Civil and Environmental Engineering; Khon Kaen University. Faculty of Engineering. Sustainable and Infrastructure Research and Development Center; Norwegian University of Science and Technology. Faculty of Engineering. Department of Marine Technology
    of the dent depth of the damaged member and is used to assess the performance of the method. It demonstrates that small changes in stiffness of individual damaged bracing members are detectable from measurements of global structural motion
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    PublicationOpen Access
    Health Risks from Indoor PM10 and Effects of Sick Building Syndrome in Office Workers
    (2021) Thanawat Thongchom; Navee On-si; Chinnasak Puongphan; Thanathorn Chumprasittichok; Thanakrit Neamhom; Mahidol University. Faculty of Public Health. Department of Environmental Health Sciences
    workers in an academic institute in Thailand. This cross-sectional study was conducted from January to March 2020 and involved 96 workers in 33 offices. Particle air sampling equipment, and a self-administered questionnaire which was developed... by the researchers, were used as the tools to acquire the concentration level of building PM10 and assess SBS symptoms, respectively. Results showed that 12 rooms in total had concentrations of PM10 that exceeded the average analysis value of 38.1±14.0 μg/m3
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    PublicationOpen Access
    Health Risks from Indoor PM10 and Effects of Sick Building Syndrome in Office Workers
    (2021) Thanawat Thongchom; Navee On-si; Chinnasak Puongphan; Thanathorn Chumprasittichok; Thanakrit Neamhom; Mahidol University. Faculty of Public Health. Department of Environmental Health Sciences; Center of Excellence on Environmental Health and Toxicology (EHT)
    workers in an academic institute in Thailand. This cross-sectional study was conducted from January to March 2020 and involved 96 workers in 33 offices. Particle air sampling equipment, and a self-administered questionnaire which was developed... by the researchers, were used as the tools to acquire the concentration level of building PM10 and assess SBS symptoms, respectively. Results showed that 12 rooms in total had concentrations of PM10 that exceeded the average analysis value of 38.1±14.0 μg/m3
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    ItemOpen Access
    Response of Monopile Offshore Wind Turbine Structure Subjected to Seismic Loads and Degradation
    (2018) Yeter, Baran; Garbatov, Yordan; Guedes Soares, Carlos; Wonsiri Punurai; M.S. Azad; Mahidol University. Faculty of Engineering. Department of Civil and Environmental Engineering; Universidade de Lisboa. Instituto Superior Técnico. Centre for Marine Technology and Ocean Engineering (CENTEC)
    at 25 m water depth to support a 5MW wind turbine. The structural assessment is performed based on the finite element method accounting for the nonlinearities associated with the geometry and material. The nonlinear structural response of the monopile