Surindra Rajabhat University
Surin, Thailand
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Kasiroek W.,Burapha University | Indananda C.,Burapha University | Luangoon N.,Burapha University | Pinthong K.,Surindra Rajabhat University | And 2 more authors.
Cytologia | Year: 2017

The first chromosome analysis and nucleolar organizer region (NOR) pattern of the humpback cardinalfish (Fibramia lateralis) were studied. Samples from 10 male and 10 female fish were collected from the Andaman Sea and Gulf of Thailand. Mitotic chromosome preparations were prepared directly from kidney tissues. Conventional and Ag-NOR staining techniques were applied to stain the chromosomes. The results showed that the diploid chromosome number of F. lateralis was 2n=46, and the fundamental numbers (NF) were 54 in both sexes. The karyotype consisted of 8 large acrocentric, 12 large telocentric, 24 medium telocentric and 2 small telocentric chromosomes. Moreover, the results indicated that the region adjacent to the telomere of the short arm of the second acrocentric chromosome pair showed clearly observable nucleolar organizer regions (NORs). Strange size chromosomes related to sex were not observed. The karyotype formula for F. lateralis is as follows: {equation presented} © 2017 The Japan Mendel Society.

Chooseangjaew S.,Khon Kaen University | Chooseangjaew S.,Rajamangala University of Technology at Srivijaya | Tanyaros S.,Rajamangala University of Technology at Srivijaya | Maneechot N.,Surindra Rajabhat University | And 3 more authors.
Cytologia | Year: 2017

Chromosome preparation from gill tissue of the tropical oyster (Crassostera belcheri Sowerby, 1871) collected from an oyster farm in Kantang District, Trang Province, southern Thailand was studied by conventional staining and Ag-NOR baining techniques. The result revealed that the diploid chromosome number is 2n=20 and the fundamental number (NF) is 40. The karyotype has revealed 10 large metacentric and 10 medium metacentric chromosomes. One pair of nucleolar organizer regions (NORs) was apparent on the short arm telomeric region of chromosome pair 10. Basic information on the cytogenetics of the C. belcheri may be useful for future studies on interspecific hybridization and polyploidy. The karyotype formula of C. belcheri is as follows: 2n (diploid) 20=Lm 10+Mm 10 © 2017 The Japan Mendel Society.

Sangpakdee W.,Udon Thani Rajabhat University | Phimphan S.,Surindra Rajabhat University | Tengjaroenkul B.,Khon Kaen University | Pinthong K.,Surindra Rajabhat University | And 2 more authors.
Cytologia | Year: 2017

The cytogenetics of the ornamented pygmy frog (Microhyla fissipes), painted chorus frog (M. pulchra) and narrow-mouthed frog (M. heymonsi) were studied in the aspect of chromosome numbers, morphology and nucleolus organizer region (NOR) locations. For this present study, we provided the karyotype and idiogram of these three species by conventional and Ag-NOR staining techniques. The 10 male and female samples of those three species were collected in Northeast Thailand. The metaphase chromosome preparations were prepared from the bone marrows by the standard protocol. To stain the chromosomes, 10% Giemsa's and 50% silver nitrate were applied. The results showed that all three species had the same diploid chromosome number of 2n=24, and fundamental numbers (NF) were 48 in both males and females. The chromosomes of M. fissipes were comprised of 16m+6sm+XY (X and Y were metacentric chromosomes). M. pulchra had chromosomes consisting of 12m+12sm and M. heymonsi had chromosomes comprising of 18m+6 with no obvious difference in size of sex chromosomes for the two species. M. fissipes and M. pulchra had the same NORs adjacent to the subcentromeric on the long arm of chromosome pair 9, while M. heymonsi had the NOR location on the short arm of chromosome pair 2 close to the centromere. For this case, we suggested that chromosome morphology and the NOR location is still a useful cytological character for taxonomic and evolutionary studies. © 2017 The Japan Mendel Society.

Phuengphai P.,Surindra Rajabhat University | Youngme S.,Khon Kaen University | Chaichit N.,Rangsit University | Reedijk J.,Leiden University | Reedijk J.,King Saud University
Inorganica Chimica Acta | Year: 2013

Two new metal-organic frameworks, {[Zn(dpe)(μ-OOCCH3) 2](H2O)}n (1) and {[Zn3(dpe) 4(μ-OOCC2H5)4](dpe)(ClO 4)2}n (2) (dpe = 1,2-bis(4-pyridyl)ethene), have been prepared and investigated. Their structures were determined by X-ray crystallography. The different structures of both compounds indicate that the different steric constraints for a methyl group (acetato, compound 1) and an ethyl group (propionato, compound 2), as well as the counteranion effects (ClO4 - for 2), play an important role in the formation and structure of these coordination polymers. Compound 1 exhibits a 1D zig-zag polymeric chain based on mononuclear secondary building units. The replacement of the acetate by propionate ligands, in the presence of additional ClO 4 - during the synthesis procedure, gives rise to a 2D network that is assembled from trinuclear secondary building units (compound 2). In addition, both compounds are further stabilized by π-π interactions and by hydrogen bonds to form intricate supramolecular frameworks. The 1D (1) and 2D (2) networks exhibit voids that contain guest water molecules for compound 1 and perchlorate/dpe for compound 2. Both coordination compounds have been structurally characterized and the thermal stability, potential cation-exchange and selected catalytic properties have been investigated. Interestingly, both Zn(II) compounds act as active heterogeneous catalysts for the high-yield cyanosilylation of acetaldehyde in dichloromethane and show highly size-selective properties for the substrate benzaldehyde. The metal sites in each compound have been studied in some more detail by using doped species with Mn(II) and Cu(II) and the EPR properties. © 2013 Elsevier Ltd. All rights reserved.

Wiwanitkit V.,Hainan Medical University | Wiwanitkit V.,Surindra Rajabhat University
Ultrastructural Pathology | Year: 2017

This letter to the editor is for discussion on publication of “Ultrastructural and immunofluorescence studies of Zika infection”. © 2017 Taylor & Francis Group, LLC

Yantaboot K.,Mahidol University | Yantaboot K.,Surindra Rajabhat University | Amornsakchai T.,Mahidol University
Polymer Testing | Year: 2017

The aim of this work is to improve the performance of natural rubber reinforced with a hybrid of pineapple leaf fiber with carbon black. When there are multiple components to be mixed into a rubber matrix, mixing can be carried out in more than one way. Thus, in this study, the effects of preparation method and the resulting carbon black distribution on the mechanical properties of the hybrid composite were evaluated. Pineapple leaf fiber (PALF) and carbon black contents were fixed at 10 parts (by weight) and 30 parts (by weight) per hundred parts of rubber (phr), respectively. In order to improve the dispersion, PALF with rubber was prepared as a masterbatch. Carbon black was added to the compound either as a single portion or as two separate portions, one in the PALF masterbatch and the other in the main mixing step. It was found that, despite using the same final compound formulation, the mixing scheme significantly affected the medium strain region of the vulcanizate stress-strain curve. No stress drop in this strain region was observed for the two-step mixing scheme. Models for composites with different preparation methods are proposed and discussed. © 2017 Elsevier Ltd

Pathomsiriwong W.,Surindra Rajabhat University | Reanprayoon P.,Surindra Rajabhat University
Journal of Environmental Science and Technology | Year: 2012

The aim of this research was to develop a low cost adsorbent for the acid dye wastewater treatment. The non-living aquatic macrophytes, Hydrilla verticillata has been investigated as a function of initial pH, contact time and initial concentrations. Adsorption kinetic and equilibrium tests were carried out in flasks under batch operations. Optimum decolorization was observed at pH 3.0 and the equilibrium state was achieved after 80 min. the pseudo-first-order and the pseudo-second-order kinetics were investigated for the biosorption system. Isotherm data can be described reasonably well with the Langmuir isotherm. In adhtion, Scanning electron microscope of pre-treated biomass shows that surface of the biomass with CaCl2 solution would remove the fine agglomerates and other surface impurities from the surface of biomass and Energy dispersive X-ray spectroscopy analysis released that pre-treated biomass was significant difference in ion exchange as K+ and Cu2+ between un-treated biomass and pre-treated biomass. FTIR spectroscopy was employed to identify the chemical functional group present on the biomass. The characteristics bands of H. verticillata biomass are attributed to chemical bonds belonpng to protein and polysaccharides functional groups. The experimental results in this study indicated that this low-cost biomaterial was an attractive candidate for the removal of acid dye from aqueous solutions at even low concentration. © 2012 Asian Network for Scientific Information.

Wiwanitkit V.,Surindra Rajabhat University
North American Journal of Medical Sciences | Year: 2014

Ebola virus infection is the present global consideration. This deadly virus can result in a deadly acute febrile hemorrhagic illness. The patient can have several clinical manifestations. As a new emerging infection, the knowledge on this infection is extremely limited. The interesting issues to be discussed include a) the atypical clinical presentation, b) new diagnostic tool, c) new treatment, and d) disease prevention. Those topics will be discussed in this special review. © 2014, North American Journal of Medical Sciences. All rights reserved.

Stanner M.,Surindra Rajabhat University
Hamadryad | Year: 2012

Recurrent laborious attempts by Varanus salvator to swallow a walking catfish (Clarias sp.) posterio-anteriorly are described. This feeding behaviour is interpreted as a trade-off between immediate gains, i.e. a presumably easy and quick anterior-posterior swallowing and a laborious and lengthy posterior-anterior swallowing, but more secure in the long-run, i.e. in cases of emergency, an anterio-posteriorly swallowed catfish may not be ejected or regurgitated quickly enough (or not at all) due to the backwards pointing spines of the pectoral fins. This trade-off is interpreted as another facet of the life-dinner principle unrelated to its original implication in predator-prey coevolution.

Reanprayoon P.,Surindra Rajabhat University | Yoonaiwong W.,Surindra Rajabhat University
Aerobiologia | Year: 2012

Thailand border market is where the local Thais, Cambodians, Laotians, and Burmeses exchange their goods and culture at the border checkpoints. It is considered to be the source of aerial disease transmission especially for foreigners because it is always very crowded with people from all walks of life. Unhealthy air quality makes this area high risk of spread of airborne diseases. This study assessed airborne concentrations of bacteria and fungi in a border market to improve exposure estimates and develop efficient control strategies to reduce health risk. The density and distribution of airborne bacteria and fungi were investigated in the Chong Chom border market in Surin Province, Thailand. Eighteen air sampling sites were taken from outdoors and various work environments including indoor footpaths, wooden handicraft shops, electronic shops, the secondhand clothing shops, and fruit market areas. Exposed Petri plate method and liquid impinger sampler were used for sampling at the breathing zone, 1.5 m above the floor level, during weekend and holiday. Meteorological factors such as relative humidity, temperature, and light intensity were collected by portable data logger. The relative humidity was 67-73%, and temperature 29-33°C, and light varied between 18 and 270 Lux m -2. Gram-positive and Gram-negative bacteria were found at a mean value of 10 4 CFU m -3, and airborne fungi of 10 3 CFU m -3 were recorded. The highest concentration of culturable airborne microorganisms was found along the indoor footpath (9.62 × 10 4 CFU m -3 and 750.00 CFU/plate/h for impingement and sedimentation methods, respectively), the fruit market area (7.86 × 10 4 CFU m -3 and 592.42 CFU/plate/h for impingement and sedimentation methods, respectively), and the secondhand clothing shop (4.59 × 10 3 CFU m -3 and 335.42 CFU/plate/h for impingement and sedimentation methods, respectively) for Gram-positive bacteria, Gram-negative bacteria, and fungi, respectively. The lowest concentration of Gram-positive bacteria, Gram-negative bacteria, and fungi was found only at the outdoor area at 1.53 × 10 4 CFU m -3, 0.93 × 10 4 CFU m -3 and 0.80 × 10 3 CFU m -3 by means of impingement method and 136.67 CFU/plate/h, 69.25 CFU/plate/h, and 62.00 CFU/plate/h by means of sedimentation methods for Gram-positive bacteria, Gram-negative bacteria, and fungi, respectively. The most frequently present airborne bacteria were identified as Bacillus, Corynebacteria, Diplococcus, Micrococcus, Acinetobacter, Alcaligenes, Enterobacter, and spore former rods. Acremonium, Aspergillus, Cladosporium, Penicillium, and Sporotrichum were the most frequently found aerosol fungi genera. The distribution of airborne microorganisms correlated with relative humidity and light factors based on principal component analysis. In conclusion, the border market is a potential source of aerial disease transmission and a various hazards of bioaerosols for workers, consumers, sellers, and tourists. The bioaerosol concentration exceeded the standard of occupational exposure limit. Many major indicators of allergenic and toxigenic airborne bacteria and fungi, Acinetobacter, Enterobacter, Pseudomonas, Cladosporium, Alternaria, Aspergillus, and Penicillium, were found in the various market environments. © Springer Science+Business Media B.V. 2011.

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