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Phuket, Thailand

Teo T.,University of Macau | Jarupunphol P.,Phuket Rajabhat University
Journal of Educational Computing Research | Year: 2015

Upadana or a condition of attachment in Buddhism has been widely acknowledged among Buddhists as the root cause of suffering because it underlies human intention and action toward a perceived phenomenon. This article investigates whether the condition of attachment in Buddhism could contribute as an external variable in the Technology Acceptance Model. Participants were 498 students from a university in Southern Thailand. They responded to a 21-item self-report questionnaire on the six variables (perceived usefulness, perceived ease of use, attitude toward use, intention to use, attachment, and actual usage) of a proposed Dhammic Technology Acceptance Model. Results using structural equation modeling revealed that the Dhammic Technology Acceptance Model has a good model fit and that attachment has direct and indirect effects on the actual use of Facebook among students. Implications for theory and further research are discussed. © The Author(s) 2015 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

Saimmai A.,Phuket Rajabhat University | Rukadee O.,Prince of Songkla University | Onlamool T.,Prince of Songkla University | Sobhon V.,Prince of Songkla University | Maneerat S.,Prince of Songkla University
World Journal of Microbiology and Biotechnology | Year: 2012

Biosurfactant-producing bacteria were isolated from mangrove sediment in southern Thailand. Isolates were screened for biosurfactant production by using the surface tension test. The highest reduction of surface tension was achieved with a bacterial strain which was identified by 16S rRNA gene sequencing as Oleomonas sagaranensis AT18. It has also been investigated using different carbon and nitrogen sources. It showed that the strain was able to grow and reduce the surface tension of the culture supernatant to 25 mN/m. In all 5.30 g of biosurfactant yield was obtained after 54 h of cultivation by using molasses and NaNO3 as carbon and nitrogen sources, respectively. The biosurfactant recovery by chloroform:methanol extraction showed a small critical micelle concentration value (8 mg/l), thermal and pH stability with respect to surface tension reduction. It also showed emulsification activity and a high level of salt concentration. The biosurfactant obtained was confirmed as a glycolipid by using a biochemical test, FT-IR and mass spectra. The crude biosurfactant showed a broad spectrum of antimicrobial activity and also had the ability to emulsify oil and enhance PAHs solubility. © 2012 Springer Science+Business Media B.V.

Maneerat W.,Mae Fah Luang University | Prawat U.,Phuket Rajabhat University | Saewanc N.,Mae Fah Luang University | Laphookhieo S.,Mae Fah Luang University
Journal of the Brazilian Chemical Society | Year: 2010

Two new coumarins namely Clausenalansimin A (5) and B (9) together with seven known coumarins (1-4 and 6-8), were isolated from twigs of Clausena lansium. All compounds were determined by spectroscopic methods. Some of isolates had cytotoxicity against human cancer cell lines (KB, MCF7 and NCI-H187). © 2010 Sociedade Brasileira de Químicaí.

Saisa-Ard K.,Suratthani Rajabhat University | Maneerat S.,Prince of Songkla University | Saimmai A.,Phuket Rajabhat University
Biotechnologia | Year: 2013

Biosurfactants-producing bacteria were isolated from various palm oil refinery industrial sites in the south of Thai-land. Isolates were screened for biosurfactant production by using low-cost, agro-industrial by-products or wastes as a substrate. Based on drop collapsing test and emulsification activity, 25 isolates were selected. All the selected isolates reduced the growth medium surface tension to 40 mN/m and produced emulsions with xylene. Twenty isolates exhibited high emulsion-stabilizing capacity, maintaining more than 50% of the original emulsion volume for 24 h. The phylogenetic position of these 25 isolates was evaluated by 16S rRNA gene sequence analysis.The production of biosurfactants was determined for strains representative of 15 different bacterial genera, six of them (Azorhizobium, Buttiauxella, Comamonas, Halopenitus, Haloplanus and Sinorhizobium) have been for the first time reported in this study as biosurfactant-producing strains. Additionally, Sinorhizobium meliloti AS91 and Marinobacter hydrocarbonoclasticus AS51 produced extracellular biosurfactant which exhibited the lowest surface tension (32 mN/m) and emulsification activity (69%) when cashew apple juice and used vegetable oil were used as the carbon source, respectively. Overall, this is the first study of a phylogenetic analysis of biosurfactant-producing bacteria from palm oil refinery industry site and their ability to produce biosurfactant on renewable substrates.

Salae A.-W.,Phuket Rajabhat University | Boonnak N.,Prince of Songkla University
Tetrahedron Letters | Year: 2013

Two new dimeric icetexane diterpenoids, obtusinones D and E (1 and 2), were isolated from the root extracts of Premna obtusifolia. Obtusinone D (1) represents the first example of a novel linear fused dimeric icetexane, whereas obtusinone E (2) is an angular fused icetexane. The structures of 1 and 2 were elucidated on the basis of 1D and 2D NMR spectral data analysis. Copyright © 2012 Elsevier Ltd.

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