Nakhon Si Thammarat, Thailand
Nakhon Si Thammarat, Thailand

Founded in 1992, Walailak University is a public university located in Tha Sala District, Nakhon Si Thammarat Province, Thailand. Although state funded, Walailak University is given a high level of autonomy, unusual among Thai public universities.The university was named after Her Royal Highness Princess Chulabhorn Walailak. Wikipedia.


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Various extreme events recorded over the world have been recognized as scientific-based evidence from possible climate change and variability. The incidence of increasing forest fires and intensive agricultural field burning in Chiangmai and Northern Thailand due to favor conditions may also due to a likely increase of droughts caused by the changing climate. Smog from biomass burning, particularly particulate matter (PM) seriously affects health and the environment. Lack and sparse of ground monitors may cause unreliability for warning information. Satellite remote sensing is now a promising technology for air quality prediction at ground level. This study was to investigate the statistical model for predicting PM concentration using satellite data. Aerosol optical depth (AOD) data were gathered from MODIS-Terra platform while hourly PM2.5 and PM10 data were collected from the Pollution Control Department. The relationship between AOD and hourly PM over Chiangmai was addressed by Model I-Simple linear regression and Model II-Multiple linear regression with ground-based meteorological data correction. The data used for the statistical analyses were from smog period in 2012 (January-April). Results revealed that AOD and hourly PM in Model I were positively correlated with the coefficient of determination (R2) of 0.22 and 0.21, respectively for PM2.5 and PM10. The relationship between AOD and hourly PM was improved significantly when correcting with relative humidity and temperature data. The model II gave R2 of 0.77 and 0.71, respectively for PM2 5 and PM10. To investigate the validity of model, the regression equation obtained from Model II was then applied with smog data over Chiangmai in March 2007. The model performed reasonably with R2 of 0.74. The model applications would provide supplementary data to other areas with similar conditions and without air quality monitoring stations, and reduce false warning the level of air pollution associated with smog from intensive biomass burning. However, further investigation in different locations should be conducted to confirm the applicability of the model.


Lertcanawanichakul M.,Walailak University
International Journal of Pharma and Bio Sciences | Year: 2015

Emergence of drug resistance among Staphylococcus aureus to currently used antibiotics has made the search for novel bioactive compounds from natural and unexplored habitats a necessity. In this study, isolation, characterization and antimicrobial activity of an actinomycete strain isolated from air at Scientific and Technological Equipments Building, Walailak University, located in Southern Thailand. Eight strains were done and identified as Streptomyces spp. using 16S rDNA sequence analysis. Streptomyces lydicus A2 exhibited antibacterial activity against Gram positive bacteria, Gram negative bacteria. Partial characterization of the active substance (resistance to heat) showed that it would be of non-protein nature. The production of the active substance showed that the production occurs between the 4th and 7th day of fermentation. This will open the way to further investigations to demonstrate their potential importance in combating pathogenic bacteria, methicillin resistant S. aureus.


Palipoch S.,Walailak University | Punsawad C.,Walailak University
Journal of Toxicologic Pathology | Year: 2013

Cisplatin is a chemotherapeutic agent widely used in treatment of several cancers. It is documented as a major cause of clinical nephrotoxicity and hepatotoxicity. The purpose of this study was to investigate the involvement of oxidative stress in the pathogenesis of cisplatin-induced liver and kidney injury. Wistar rats were divided into four groups. Group 1 (control) was intraperitoneally (IP) injected with a single dose of 0.85% normal saline. Groups 2, 3 and 4 were IP injected with single doses of cisplatin at 10,25 and 50 mg/kg body weight (BW), respectively. At 24, 48, 72, 96 and 120 h after injection, BW, levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), blood urea nitrogen (BUN), creatinine, malondialdehyde (MDA), and activity of superoxide dismutase (SOD) and histology of the liver and kidney were evaluated. Cisplatin caused a reduction in BW of rats in groups 2, 3 and 4 at all post injection intervals. The levels of serum ALT, AST, BUN and creatinine and MDA of the kidney and liver were markedly increased especially at 48 and 72 h, whereas the activity of SOD was decreased after cisplatin injection. Liver sections revealed moderate to severe congestion with dilation of the hepatic artery, portal vein and bile duct and disorganization of hepatic cords at 50 mg/kg of cisplatin. Kidney sections illustrated mild to moderate tubular necrosis at 25 and 50 mg/kg of cisplatin. Therefore, oxidative stress was implicated in the pathogenesis of liver and kidney injury causing biochemical and histological alterations. © 2013 The Japanese Society of Toxicologic Pathology.


Chaijan M.,Walailak University
Food Chemistry | Year: 2011

The effect of wet and dry saltings on the physicochemical changes of tilapia (Oreochromis niloticus) muscle was investigated. Dry salting resulted in the higher rate of salt uptake into tilapia muscle facilitating the faster decrease in Aw (p < 0.05). The pH of both dry and wet salted fish muscles tended to decrease throughout the salting time and the lower pH was found in dry salted fish (p < 0.05). The increase in the protein content in the salting medium was found during wet salted tilapia production (p < 0.05). The TCA-soluble peptide content tended to decrease with increasing the salting time in both salting methods (p < 0.05), suggesting a leaching effect of the salting medium or the exudative loss occurred in salted tilapia. Wet salting caused the greater formation of metmyoglobin in tilapia muscle when compared to dry salting at all time points (p < 0.05) and the content of metmyoglobin increased as salting time increased in both salting methods (p < 0.05). A lowered metmyoglobin with a lowered redness index of dry salted tilapia muscle was found, indicating the continuous oxidation of metmyoglobin to other hypervalent derivatives and hence the discolouration of salted tilapia. Lipid hydrolysis and oxidation of tilapia meat occurred with varying degrees in both salting methods and these changes depended on salting time. Dry salting resulted in a higher oxidation of tilapia muscle lipid as indicated by the higher PV and TBARS throughout the salting period when compared with that of wet salting (p < 0.05). In conclusion, the physicochemical changes of tilapia muscle during salting are governed by the salting method and the salting time applied. © 2011 Elsevier Ltd. All rights reserved.


Palipoch S.,Walailak University
African journal of traditional, complementary, and alternative medicines : AJTCAM / African Networks on Ethnomedicines | Year: 2013

Acute kidney injury (AKI) is the common clinical syndrome which is associated with increased morbidity and mortality. The severity extends from less to more advanced spectrums which link to biological, physical and chemical agents. Oxidative stress (OS)-related AKI has demonstrated the increasing of reactive oxygen species (ROS) and reactive nitrogen species (RNS) and the decreasing of endogenous antioxidants. Medicinal plants-derived antioxidants can be ameliorated oxidative stress-related AKI through reduction of lipid peroxidation (LPO) and enhancement of activities and levels of endogenous antioxidants. Therefore, medicinal plants are good sources of exogenous antioxidants which might be considered the important remedies to ameliorate pathological alterations in oxidative stress-related AKI.


Channuie P.,Walailak University
International Journal of Modern Physics D | Year: 2014

In light of BICEP2, we re-examine single field inflationary models in which the inflation is a composite state stemming from various four-dimensional strongly coupled theories. We study in the Einstein frame a set of cosmological parameters, the primordial spectral index ns and tensor-to-scalar ratio r, predicted by such models. We confront the predicted results with the joint Planck data, and with the recent BICEP2 data. We constrain the number of e-foldings for composite models of inflation in order to obtain a successful inflation. We find that the minimal composite inflationary model is fully consistent with the Planck data. However it is in tension with the recent BICEP2 data. The observables predicted by the glueball inflationary model can be consistent with both Planck and BICEP2 contours if a suitable number of e-foldings are chosen. Surprisingly, the super Yang-Mills inflationary prediction is significantly consistent with the Planck and BICEP2 observations. © 2014 World Scientific Publishing Company.


Chimsung N.,Walailak University
Songklanakarin Journal of Science and Technology | Year: 2014

Maturation diets for shrimp ideally comprise excellent digestible protein, essential fatty acids, and cholesterol and chemo-attractant properties which are found in natural food sources in the shrimp habitat. Fresh feeds typically including polychaete worms, mollusks and crustaceans have been extensively used for shrimp broodstock. However, their nutritional value can vary with species, season of harvest and life stage. Alternatively, compound diets have been formulated based on the nutritional profile of fresh feeds have being produced in a semi-moist diet and dried pellets. But, substitution of fresh feeds by compound diets is scarce due to lack of information on the quantitative dietary requirements of shrimp broodstock. For most Penaeus monodon hatcheries, good reproductive performance was obtained when shrimp broodstock were fed a mixture of fresh feeds and compound feeds.


Suwanbamrung C.,Walailak University
Asian Pacific Journal of Tropical Disease | Year: 2012

Objective: To develop children's basic knowledge and activities to solve the dengue problem, and to evaluate the results from children's activities. Methods: Participatory Action Research (PAR) was applied in five steps: 1) preparation step; 2) assessment step; 3) children's activities planning step; 4) implementation step; 5) evaluation step. Basic knowledge of dengue was evaluated by questionnaires (17 items) and analysis pre and post-activities by a Chi-square statistic test. The children's understanding of the dengue problem was evaluated by drawing pictures and participation of children's activities. Larval Indices (BI, HI, and CI) were ratio analysis which related dengue outbreak measurement. Results: Three groups for children' activities were: 1) group leaders (13 children); 2) general children; 3) a support group from the community. " Education of dengue learning", " dengue prevention campaign", and " the recycle garbage bank" were core children's activities. Most children's knowledge question items showed an increase from pre-activities to post-activities, and a half of all questions items were statistically significantly different (P<0.05). There were five categories of children's reflection from the drawn picture that showed understanding of the solution to dengue problems and methods for eliminating sites of mosquito breeding in the community. Their households had increased garbage management, and thus decreased numbers of mosquito breeding types such as larval indices (BI, HI, and CI) which decreased from before the activities (93, 30, and 14) to after them (7, 5, and 1). Furthermore, no instances of dengue morbidity or the mortality rate occurred during the study. Conclusions: Although there was an increase in the children's knowledge and activities, and a decrease in larval indices ratio, the high risk of a dengue epidemic might be found because the ratios of larval indices were based on community's behaviors. Thus, it is essential for children and all stakeholders in and out of the community needed to better combat the dengue problem. © 2012 Asian Pacific Tropical Medicine Press.


Matan N.,Walailak University
International Food Research Journal | Year: 2012

Antimicrobial activity of whey protein edible film incorporated with essential oils (cinnamonoil, clove oil, anise oil, turmeric oil, guava leaf oil, nutmeg oil and lime oil) at 2%, 4% and 6%(vol/vol) against major molds (Aspergillus flavus, Penicillium sp.) and bacteria (Staphylococcus aureus) found on dried fish (Decapterus maruadsi) were investigated using circular discs of edible film. Zones of inhibition were measured after an incubation period. The film containing anise oil was the most effective against mold than the other essential oils (P < 0.05). Storage tests were carried out for the dried fish packaged with edible film containing 4% and 6% (v/v) of anise oilstored at 30 °C for 28 days. This was found to extend the shelf life of the dried fish for up to 21 days. In addition, the fillets (3 cm × 2 cm) of the dried fish coated with 4% and 6% of anise oil were fried in vegetable oil for 1-2 min for the sensory test. Results from the sensory test showed that panelists were unable to detect the flavour and aroma differences between the control dried fish samples and those treated with 4% anise oil but a difference was detected for 6% anise oil. These findings illustrated that the shelf life of the dried fish could be extended using ediblefilm with incorporated essential oils.


Channuie P.,Walailak University
Nuclear Physics B | Year: 2015

In this article, we review how strong dynamics can be efficiently employed as a viable alternative to study the mechanism of cosmic inflation. We examine single-field inflation in which the inflaton emerges as a bound state stemming from various strongly interacting field theories. We constrain the number of e-foldings for composite models of inflation in order to obtain a successful inflation. We study a set of cosmological parameters, e.g., the primordial spectral index ns and tensor-to-scalar ratio r, and confront the predicted results with the joint Planck data, and with the recent BICEP2 data. © 2015 The Author.

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