Narathiwat, Thailand
Narathiwat, Thailand

Princess of Naradhiwas University is a government sponsored university in Narathiwat, southern Thailand. It was founded under the act on 9 February 2005 by merging all educational institutions in the province together. Those institutions are Narathiwat Technical College, Narathiwat Agricultural & Technology College, Takbai vocational college and Boromarjonani College of Nursing, Narathiwat.The main objectives of the amalgamation are to utilize the resources most effectively with the lowest investment, to give the opportunity for local students to get education in university and to respond to the local people’s desires for education. If the objectives are achieved, the quality of people would be improved in that all have jobs to do and the local economy would be developed.The name of the university was granted by Bhumibol Adulyadej in honor of his sister Galyani Vadhana. Wikipedia.


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Nuntadusit C.,Prince of Songkla University | Piya I.,Princess of Naradhiwas University | Wae-hayee M.,Prince of Songkla University | Eiamsa-ard S.,Mahanakorn University of Technology
Journal of Mechanical Science and Technology | Year: 2015

The heat transfer characteristics were experimentally investigated in a wind channel with different types of cut baffles for heat transfer augmentation. The aim of using zigzag-cut baffles is to create 3D flow structure behind the baffles instead of transverse vortex flow leading to enhance heat transfer. In this study, 4 types of baffles were examined; conventional baffle (Rectangular cross section with no cut), baffle with rectangular zigzag-cut, baffle with triangle zigzag-cut at 45 degree and at 90 degree. All of the baffles have the same height at H = 15 mm and flow blocking area. In the experiment, the row of seven baffles was attached on the inner surface of wind channel. The effects of pitch spacing length were also investigated at baffle pitch distance P/H = 4, 6 and 8 (H: Height of baffle). The experiments were performed at constant Reynolds number (Re) of 20000. The heat transfer patterns via Thermochromic liquid crystal sheet were visualized and recorded with a digital camera. The recorded images were then analyzed with image processing technique to obtain the distribution of Nusselt number. The flow characteristics pass through the baffles were also numerically studied with CFD simulation for understanding the heat transfer characteristics. The friction losses were measured to evaluate the thermal performance for each baffle. It was found that the baffle with rectangular zigzag-cut gives the best thermal performance due to heat transfer augmentation in upstream and downstream side of baffle. © 2015, The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.


Thanachayanont C.,National Metal and Materials Technology Center | Yordsri V.,National Metal and Materials Technology Center | Kijamnajsuk S.,National Metal and Materials Technology Center | Binhayeeniyi N.,Princess of Naradhiwas University | Muensit N.,Prince of Songkla University
Materials Letters | Year: 2012

Microstructure is known to be one of the most important factors affecting dielectric constant, Curie temperature, electrical conductivity and breakdown voltage of Ba(Zr xTi 1 - x)O 3 (BZT) powders. Grain sizes of sol-gel derived BZT are known to be much smaller than those prepared by solid-state reaction enabling low sintering temperatures to be used during subsequent processing. In this study, crystal structures of Ba(Zr xTi 1 - x)O 3, x = 0, 0.05, 0.10, 0.15 and 0.20, prepared by the sol-gel technique were investigated using Rietveld refinement X-ray Diffraction (XRD) and convergent beam electron diffraction (CBED). Lattice parameters obtained from XRD were used for CBED pattern simulation. The experimental CBED patterns taken from individual grains matched well with the simulated results. Morphology of the BZT powders was investigated using transmission electron microscopy (TEM). It was found that as the zirconium content increased, both c- and a-lattice constants gradually increased. The tetragonality (c/a) decreased to almost unity at x = 0.15 which was smaller than the value x = 0.20 previously reported for the BZT powders prepared by mixed oxide method. Hence, the nano-grain sizes ranging from 133.4 to 214.8 nm in the sol-gel BZT powders were found to modify the Zr content, x, needed to promote the phase transition from the tetragonal to cubic lattice structure. © 2012 Elsevier B.V. All rights reserved.


Satthakarn S.,Prince of Songkla University | Hladik F.,University of Washington | Hladik F.,Fred Hutchinson Cancer Research Center | Promsong A.,Princess of Naradhiwas University | And 2 more authors.
BMC Complementary and Alternative Medicine | Year: 2015

Background: Vaginal epithelial cells (VECs) produce antimicrobial peptides including human β-defensin 2 (hBD2) and secretory leukocyte protease inhibitor (SLPI), as well as cytokines and chemokines that play vital roles in mucosal innate immunity of the female reproductive tract. Houttuynia cordata Thunb (H. cordata), a herbal plant found in Asia, possesses various activities including antimicrobial activity and anti-inflammation. As inflammation and infection are commonly found in female reproductive tract, we aimed to investigate the effects of H. cordata water extract in modulating innate immune factors produced by VECs. Methods: Primary human VECs were cultured and treated with H. cordata at a concentration ranging from 25-200 μg/ml for 6 or 18 h. After treatment, the cells and culture supernatants were harvested. The expression of hBD2 and SLPI mRNA was evaluated by quantitative real-time reverse transcription PCR. Levels of secreted hBD2 and SLPI as well as cytokines and chemokines in the supernatants were measured by ELISA and Luminex assay, respectively. Cytotoxicity of the extract on VECs was assessed by CellTiter-Blue Cell Viability Assay. Results: H. cordata did not cause measurable toxicity on VECs after exposure for 18 h. The expression of hBD2 and SLPI mRNA as well as the secreted hBD2 protein were increased in response to H. cordata exposure for 18 h when compared to the untreated controls. However, treatment with the extract for 6 h had only slight effects on the mRNA expression of hBD2 and SLPI. The secretion of IL-2 and IL-6 proteins by VECs was also increased, while the secretion of CCL5 was decreased after treatment with the extract for 18 h. Treatment with H. cordata extract had some effects on the secretion of IL-4, IL-8, CCL2, and TNF-aα, but not statistically significant. Conclusions: H. cordata water extract modulates the expression of antimicrobial peptides and cytokines produced by VECs, which play an important role in the mucosal innate immunity in the female reproductive tract. Our findings suggest that H. cordata may have immunomodulatory effects on the vaginal mucosa. Further studies should be performed in vivo to determine if it can enhance mucosal immune defenses against microbial pathogens. © Satthakarn et al. 2015.


Meengam C.,Prince of Songkla University | Tehyo M.,Prince of Songkla University | Muangjunburee P.,Princess of Naradhiwas University | Wannasin J.,Prince of Songkla University
Applied Mechanics and Materials | Year: 2013

The aim of this research is to study the influence of welding parameters on the metallurgical and mechanical properties of friction stir welded butt joints of dissimilar aluminum alloy sheets between Semi-Solid Metal (SSM) 356-T6 and AA6061-T651 by Friction Stir Welding (FSW). The base materials of SSM 356-T6 and AA6061-T651 were located on the advancing side (AS) and on the retreating side (RS) respectively. The base materials were joined under different tool rotation speeds and welding speeds. The material flows from SSM 356 and AA6061-T651 were clearly visible in the weld nugget. In addition, the mixtures of fine equiaxed grain were observed in the stir zone. The increase in tool rotation speed results in the increase in tensile strength of the joints. As for welding speed associated with various tool rotation speeds, an increase in the welding speed affected lesser the base material's tensile strength up to an optimum value; after which its effect increased. Tensile elongation was generally greater at greater tool rotation speed. An averaged maximum tensile strength of 206.3 MPa was derived for a welded specimen produced at the tool rotation speed of 2,000 rpm associated with the welding speed of 80 mm/min. In the weld nugget, higher hardness was observed in the stir zone than in the thermo-mechanically affected zone. Away from the weld nugget, hardness levels increased back to the levels of the base materials. © (2013) Trans Tech Publications, Switzerland.


Radenahmad N.,Prince of Songkla University | Saleh F.,Imam Muhammad ibn Saud Islamic University | Sayoh I.,Princess of Naradhiwas University | Sawangjaroen K.,Prince of Songkla University | And 4 more authors.
BMC Complementary and Alternative Medicine | Year: 2012

Background: Estrogen has been reported to accelerate cutaneous wound healing. This research studies the effect of young coconut juice (YCJ), presumably containing estrogen-like substances, on cutaneous wound healing in ovairectomized rats.Methods: Four groups of female rats (6 in each group) were included in this study. These included sham-operated, ovariectomized (ovx), ovx receiving estradiol benzoate (EB) injections intraperitoneally, and ovx receiving YCJ orally. Two equidistant 1-cm full-thickness skin incisional wounds were made two weeks after ovariectomy. The rats were sacrificed at the end of the third and the fourth week of the study, and their serum estradiol (E2) level was measured by chemiluminescent immunoassay. The skin was excised and examined in histological sections stained with H&E, and immunostained using anti-estrogen receptor (ER-α an ER-β) antibodies.Results: Wound healing was accelerated in ovx rats receiving YCJ, as compared to controls. This was associated with significantly higher density of immunostaining for ER-α an ER-β in keratinocytes, fibroblasts, white blood cells, fat cells, sebaceous gland, skeletal muscles, and hair shafts and follicles. This was also associated with thicker epidermis and dermis, but with thinner hypodermis. In addition, the number and size of immunoreactive hair follicles for both ER-α and ER-β were the highest in the ovx+YCJ group, as compared to the ovx+EB group.Conclusions: This study demonstrates that YCJ has estrogen-like characteristics, which in turn seem to have beneficial effects on cutaneous wound healing. © 2012 Radenahmad et al.; licensee BioMed Central Ltd.


Mekarat S.,Princess of Naradhiwas University | Pakawatchai C.,Prince of Songkla University | Saithong S.,Princess of Naradhiwas University
Acta Crystallographica Section E: Structure Reports Online | Year: 2014

In the title salt, [Ag(C7H8N2S)(C 18H15P) 2]NO3, the coordination geometry about the AgI atom is shallow trigonal pyramidal, with the metal atom displaced by 0.372 (1) Åfrom the plane of the P and S atoms. In the crystal, the cations are linked to the anions by N-H⋯O hydrogen bonds, generating tetramers (two cations and two anions), which feature R2 2(8) and R4 4(8) loops. The cations are linked by weak C-H⋯-interactions, generating a three-dimensional network.


PubMed | Princess of Naradhiwas University, North Dakota State University and Prince of Songkla University
Type: | Journal: Research in microbiology | Year: 2017

This study was aimed at selecting purple non-sulfur bacteria (PNSB) isolated from various paddy fields, including Cd- and Zn-contaminated paddy fields, based on their biofertilizer properties. Among 235 PNSB isolates, strain TN110 was most effective in plant growth-promoting substance (PGPS) production, releasing 3.2mg/L of [Formula: see text] , 4.11mg/L of 5-aminolevulinic acid (ALA) and 3.62mg/L of indole-3-acetic acid (IAA), and reducing methane emission up to 80%. This strain had nifH, vnfG and anfG, which are the Mo, V and Fe nitrogenase genes encoded for key enzymes in nitrogen fixation under different conditions. This strain provided 84% and 55% removal of Cd and Zn, respectively. Another isolate, TN414, not only produced PGPS (1.30mg/L of [Formula: see text] , 0.94mg/L of ALA and 0.65mg/L of IAA), but was also efficient in removing both Cd and Zn at 72% and 74%, respectively. Based on 16S rDNA sequencing, strain TN110 was identified as Rhodopseudomonas palustris, while strain TN414 was Rubrivivax gelatinosus. A combination of TN110 and TN414 could potentially provide a biofertilizer, which is a greener alternative to commercial/chemical fertilizers and an agent for bioremediation of heavy metals and greenhouse gas mitigation in paddy fields.


PubMed | Princess of Naradhiwas University and Prince of Songkla University
Type: Journal Article | Journal: Acta crystallographica. Section E, Structure reports online | Year: 2014

In the title salt, [Ag(C7H8N2S)(C18H15P)2]NO3, the coordination geometry about the Ag(I) atom is shallow trigonal pyramidal, with the metal atom displaced by 0.372(1) from the plane of the P and S atoms. In the crystal, the cations are linked to the anions by N-HO hydrogen bonds, generating tetra-mers (two cations and two anions), which feature R 2 (2)(8) and R 4 (4)(8) loops. The cations are linked by weak C-H inter-actions, generating a three-dimensional network.


PubMed | Princess of Naradhiwas University and Prince of Songkla University
Type: Journal Article | Journal: Journal of intercultural ethnopharmacology | Year: 2016

Essential oils (EOs) have been claimed to modulate mental functions though the most of data were obtained from subjective methods of assessment. Direct effects of EO on brain function remained largely to be confirmed with scientific proof. This study aimed to demonstrate quantifiable and reproducible effects of commercial vetiver (Vetiveria zizanioides) EO inhalation on sleep-waking and electroencephalogram (EEG) patterns in adult male Wistar rats. The experiments were conducted during November 2013 - February 2014.The following electrode implantation on the skull, control, and treated animals were subjected for EEG recording while inhaling water and vetiver EO (20 and 200 l), respectively. Fast Fourier transform was used for analysis of EEG power spectrum.One-way ANOVA analysis confirmed that vetiver EO inhalation significantly increased total waking and reduced slow-wave sleep time. Moreover, EO inhalation decreased alpha and beta1 activity in both frontal and parietal cortices and increased gamma activity in the frontal cortex. Changes in these frequencies began almost from the start of the inhalation.These data suggest refreshing properties of vetiver EO on electrical brain activity and alertness.


PubMed | Excellent Research Laboratory, Princess of Naradhiwas University, University of Washington and Prince of Songkla University
Type: | Journal: BMC complementary and alternative medicine | Year: 2015

Vaginal epithelial cells (VECs) produce antimicrobial peptides including human -defensin 2 (hBD2) and secretory leukocyte protease inhibitor (SLPI), as well as cytokines and chemokines that play vital roles in mucosal innate immunity of the female reproductive tract. Houttuynia cordata Thunb (H. cordata), a herbal plant found in Asia, possesses various activities including antimicrobial activity and anti-inflammation. As inflammation and infection are commonly found in female reproductive tract, we aimed to investigate the effects of H. cordata water extract in modulating innate immune factors produced by VECs.Primary human VECs were cultured and treated with H. cordata at a concentration ranging from 25-200g/ml for 6 or 18h. After treatment, the cells and culture supernatants were harvested. The expression of hBD2 and SLPI mRNA was evaluated by quantitative real-time reverse transcription PCR. Levels of secreted hBD2 and SLPI as well as cytokines and chemokines in the supernatants were measured by ELISA and Luminex assay, respectively. Cytotoxicity of the extract on VECs was assessed by CellTiter-Blue Cell Viability Assay.H. cordata did not cause measurable toxicity on VECs after exposure for 18h. The expression of hBD2 and SLPI mRNA as well as the secreted hBD2 protein were increased in response to H. cordata exposure for 18h when compared to the untreated controls. However, treatment with the extract for 6h had only slight effects on the mRNA expression of hBD2 and SLPI. The secretion of IL-2 and IL-6 proteins by VECs was also increased, while the secretion of CCL5 was decreased after treatment with the extract for 18h. Treatment with H. cordata extract had some effects on the secretion of IL-4, IL-8, CCL2, and TNF-, but not statistically significant.H. cordata water extract modulates the expression of antimicrobial peptides and cytokines produced by VECs, which play an important role in the mucosal innate immunity in the female reproductive tract. Our findings suggest that H. cordata may have immunomodulatory effects on the vaginal mucosa. Further studies should be performed in vivo to determine if it can enhance mucosal immune defenses against microbial pathogens.

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