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Sangchart T.,Ubon Ratchathani University | Niroram A.,Ubon Ratchathani University | Kaewpuang T.,Suranaree University of Technology | Prachumrak N.,Suranaree University of Technology | And 9 more authors.
RSC Advances | Year: 2015

A series of oligofluorenes bearing two 3,6-dipyrenylcarbazole units as the terminal substituents, namely BPCFn (n = 1-3), were successfully synthesized and characterized as non-doped hole-transporting blue emitters. These molecules showed strong blue emission with good solubility, and thermally stable amorphous and excellent film-forming properties. OLEDs using these materials as the emissive layers were fabricated by a simple solution spin-coating process. The blue OLED with excellent device performance (brightness of 6085 cd m-2, luminance efficiency of 4.13 cd A-1 and turn-on voltage of 3.4 V) was attained from BPCF3. © The Royal Society of Chemistry 2015.

Chaiprapat S.,Prince of Songkla University | Mardthing R.,Prince of Songkla University | Kantachote D.,Prince of Songkla University | Karnchanawong S.,Chaing Mai University
Process Biochemistry | Year: 2011

Anaerobic treatment of sulfate-rich wastewater from concentrated rubber latex industry results in high hydrogen sulfide (H2S) in the biogas, which is odorous, toxic, and corrosive to equipment. The effects of retention time (RT) and air mix ratio on the performance and kinetics of the aerobic biofilm reactor in H2S removal were assessed. It was found that H2S removal efficiency increased with increasing air mix ratio and RT. Under a 1:4 biogas-to-air ratio, the system could achieve average removals of 94.7%, 87.3%, 85.6% at RT of 160, 80 and 40 s, respectively. Our biofilter system showed a maximum elimination capacity (ECmax) of 256.4 g/m3/h in our kinetics study. When operated with the acidic wastewater discharged from concentrated rubber factory, the system gave an equivalent performance to that operated with synthetic liquid. Results also revealed that some undesirable methane oxidation had occurred in the biofilter bed. Furthermore, types of the liquid used apparently affected the dominant microbial species in the bed. Although the middle portion of biofilter bed contained fewer microorganisms, H2S could still efficiently be converted to sulfuric acid that could potentially be reused in the concentrated rubber latex industry. © 2010 Elsevier Ltd. All rights reserved.

Thangthong A.,Ubon Ratchathani University | Prachumrak N.,Suranaree University of Technology | Sudyoadsuk T.,Ubon Ratchathani University | Namuangruk S.,National Nanotechnology Center | And 5 more authors.
Organic Electronics: physics, materials, applications | Year: 2015

To achieve high efficiency solution processed red OLED, a series of new triphenylamine-functionalized dithienylbenzothiadiazoles, namely TB, T3TB and T4TB, as non-doped solution-processed hole-transporting red emitters were synthesized and characterized. Particularly, T3TB having five triphenylamine units substituted on the dithienylbenzothiadiazole core exhibited a good red emission with high Tg amorphous and good film-forming properties. A simple structured non-doped red OLED (ITO/PEDOT:PSS/T3TB(spin coating)/BCP/LiF-Al) with an efficiency (η) of 6.25 cd A-1 at 4.1 mA cm-2 (PE = 5.17 lm W-1), a low turn-on voltage (3.0 V) and a pure red emission (λEL = 656 nm, CIE (x, y) = 0.67, 0.33) was attained. © 2015 Elsevier B.V. All rights reserved.

Yundaeng C.,Kasetsart University | Somta P.,Kasetsart University | Tangphatsornruang S.,National Center for Genetic Engineering and Biotechnology | Wongpornchai S.,Chaing Mai University | Srinives P.,Kasetsart University
Theoretical and Applied Genetics | Year: 2013

Key message: Sequence analysis and genetic mapping revealed that a 1,444 bp deletion causes a premature stop codon in SbBADH2 of sorghum IS19912. The non-function of SbBADH2 is responsible for fragrance in sorghum IS19912. 2-acetyl-1-pyrroline (2AP) is a potent volatile compound causing fragrance in several plants and foods. Seeds of some varieties of rice, sorghum and soybean possess fragrance. The genes responsible for fragrance in rice and soybean are orthologs that correspond to betaine aldehyde dehydrogenase 2 (BADH2). Genotypes harboring fragrance in rice and soybean contain a premature stop codon in BADH2 which impairs the synthesis of full length functional BADH2 protein leading to the accumulation of 2AP. In this study, we reported an association between the BADH2 gene and fragrance in sorghum. An F2 population of 187 plants developed from a cross between KU630 (non-fragrant) and IS19912 (fragrant) was used. Leaves of F2 and F3 progenies were evaluated for fragrance by organoleptic test, while seeds of F2 plants were analyzed for 2AP. The tests consistently showed that the fragrance is controlled by a single recessive gene. Gene expression analysis of SbBADH1 and SbBADH2 in leaves of KU630 and IS19912 at various stages revealed that SbBADH1 and SbBADH2 were expressed in both accessions. Sequence comparison between KU630 and IS19912 revealed a continuous 1,444 bp deletion encompassing exon 12 to 15 of SbBADH2 in IS19912 which introduces a frameshift mutation and thus causes a premature stop codon. An indel marker was developed to detect polymorphism in SbBADH2. Bulk segregant and QTL analyses confirmed the association between SbBADH2 and fragrance. © 2013 Springer-Verlag Berlin Heidelberg.

Anamnart W.,Walailak University | Pattanawongsa A.,Walailak University | Intapan P.M.,Khon Kaen University | Morakote N.,Chaing Mai University | And 2 more authors.
PLoS ONE | Year: 2013

Strongyloidiasis is prevalent in Thailand, yet its prevalence in the south is lower than in other parts of the country. This might be due to the long rainy season in the south resulting in stool submersion in water inhibiting worm development. In this study, the effect of water submersion of fecal samples on development of Strongyloides stercoralis was investigated. Ten ml of a 1:5 fecal suspension were placed in 15-ml tubes, 35-mm dishes, and 90-mm dishes producing the depths of 80 mm, 11 mm and 2 mm-suspensions, respectively. The worm development was followed at 1/6, 4, 6, 8, 10, 12, 14, 16, 24, and 36 h, by determining the number of filariform larva (FL) generated from agar-plate cultures (APC). Fecal suspensions kept in tubes and 35-mm dishes showed a decline in FL yield relative to incubation time and reached zero production 14 h after incubation. In contrast, the number of FL generated from the suspension kept in 90-mm dishes remained stable up to 36 h. Cumulatively, all tubes and 35-mm dishes became negative in APC after 14 h while 90-mm dishes remained APC-positive up to 36 h. Adding more water or stool suspension to dishes resulted in a decreased number of FL. Mechanical aeration of the suspensions in tubes restored an almost normal FL yield. It appears that the atmospheric air plays a significant role in growth and development of S. stercoralis in the environment and may be one of factors which contribute to a lower prevalence of human strongyloidiasis in the south of Thailand. © 2013 Anamnart et al.

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