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Nakhon Si Thammarat, Thailand

Rittirat S.,Nakhon Si Thammarat Rajabhat University | Klaocheed S.,Prince of Songkla University | Thammasiri K.,Mahidol University
Acta Horticulturae | Year: 2015

Protocorm-like bodies (PLB) of Phalaenopsis cornu-cervi (Breda) Blume &Rchb. f. derived from wounded protocorm segments culturing on =Murashige and Skoog, 1962 (MS) medium containing 0.1 mg/L NAA and 0.1 mg/L TDZ. Encapsulation of the PLB using 3% sodium alginate and 100 mM calcium chloride dissolved in ND liquid medium supplemented 2% (w/v) sucrose. Among the three temperature regimes of storage (4±1°C, 8±1°C, 25±1°C), encapsulated PLB stored at 25±1°C, for 30 days showed maximum percentage of germination at 100 when culture on ND medium supplemented with 4% (w/v) sucrose with 0.2% (w/v) activated charcoal (AC). Plantlets regenerated from capsules were acclimatized successfully with 100% survival rate. Morphological characteristics of those plantlets were normal and ploidy level was the same as controlled plantlets as revealed by flow cytometry.

Pimsen R.,Chulalongkorn University | Pimsen R.,Nakhon Si Thammarat Rajabhat University | Khumsri A.,Chulalongkorn University | Wacharasindhu S.,Chulalongkorn University | And 2 more authors.
Biosensors and Bioelectronics | Year: 2014

Widespread use of dichlorvos in agriculture has posed serious concern for food and water contamination. A new colorimetric method for the detection of dichlorvos based on polydiacethylene and acetylcholinesterase inhibition is developed. The blue-to-red color transition of poly(10,12-pentacosadynoic acid) vesicles can be induced by myristoylcholine which is enzymatically hydrolyzed by acetylcholinesterase to myristic acid and choline to prevent the color transition. In the presence of dichlorvos, the hydrolytic activity of the enzyme is inhibited that the blue-to-red color transition is restored with a linear correlation to the dichlorvos concentration. Using UV-vis absorption spectrometer, the limit of dichlorvos detection is 6.7. ppb. A naked eye detection of 50. ppb dichlorvos is achievable by using dimiristoylphosphatidylcholine to the diacetylene mixed lipid vesicles. © 2014 Elsevier B.V.

Theerachun S.,Nakhon Si Thammarat Rajabhat University | Speece M.,American University of Kuwait | Zimmermann W.,Asian Institute of Technology
Journal of International Food and Agribusiness Marketing | Year: 2013

Micro-retailers in the developing world face tough competition from the modern retail sector, and there is some question about their long-term viability. The key to a sustainable role in retailing as the economy modernizes is continuing loyalty among the expanding middle class. We use in-depth interviews among traditional micro-retailers and their customers in Bangkok to illustrate that 1 segment of middle-class customers does see substantial value in continuing to patronize traditional micro-retailers. The service interaction and buyer-seller relationships are vital to customer loyalty for these traditional micro-retailers. Based on this, it seems likely that at least some traditional micro-retailers will be able to survive and prosper as the food retail environment modernizes in Thailand. © 2013 Copyright Taylor and Francis Group, LLC.

Chantruthai P.,Nakhon Si Thammarat Rajabhat University | Taneerananon D.,Prince of Songkla University | Taneerananon P.,Prince of Songkla University
Engineering Journal | Year: 2014

This paper investigates the competitiveness between Low Cost Airlines (LCA) and High Speed Rail (HSR) on the southern corridor where LCA predominate at present. A study of passengers' Origin and Destination (O-D) pairs in southern corridor of Thailand was conducted. The O-D surveys were carried out for the 2 sections of the southern corridor: Surat Thani-Bangkok (ST-BKK) and Hat-Yai -Bangkok (HY-BKK). The competitiveness between HSR and LCA and the Willing-To-Pay for the HSR fare were analysed using factors determined by the multinomial logistic regression model and binary logistic regression model, respectively. Competitiveness between HSR and LCA did not depend only on travel time alone but also on factors such as fare difference, users'occupation, household income, education level and trip purposes. The result of the Willingness-To-Pay for the HSR fare showed the fare for O-D pairs between ST-BKK and HY-BKK at 1.8 THB/km(US$ 0.06/km) and 1.5 THB/km (US$ 0.05/km), respectively. The average HSR fare was 1.65 THB/km (US$ 0.055/km). This is in comparison to the fare of HY-BKK 2.45 THB/km (US$ 0.08/km) for a LCA, and an average of 2.65 THB/km (US$ 0.09/km) for another LCA. It is seen that the fare differential of 1 THB/km (US$ 0.03/km) could be significant in making passengers change from LCA to HSR.

Charoensuk T.,Walailak University | Sirisathitkul C.,Walailak University | Tangwatanakul W.,Nakhon Si Thammarat Rajabhat University | Pinitsoontorn S.,Khon Kaen University | Boonyang U.,Walailak University
Journal of Ceramic Science and Technology | Year: 2016

Multifunctional macro/mesoporous bioactive glasses(MMBG) with magnetic sensitivity are prepared by adding ferric nitrate in a one-pot sol-gel synthesis. Three different magnetic properties are obtained depending on the synthesis composition and calcination atmosphere. The gradual transition from paramagnetism to superparamagnetism is observed when ferric nitrate is increased from 5 up to 20mol%. In contrast to minimal paramagnetic response to an applied magnetic field, substantial magnetizations are induced in superparamagneticMMBGowing to the formation of iron oxide nanoparticles, which is signified by the change in color after calcination. The transition from superparamagnetism to ferromagnetism occurs when the MMBG are calcined in an argon instead of an oxygen atmosphere. This ferromagnetic hysteresis coincides with the formation of Fe-rich spheres with diameters larger than 100 nm. © 2016 Göller Verlag.

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