Chiang Mai, Thailand
Chiang Mai, Thailand

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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.


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.


Tangpaitoon T.,Chaing Mai University | Nisoog C.,Chaing Mai University | Lojanapiwat B.,Chaing Mai University
International Braz J Urol | Year: 2012

Objective: To compare the efficacy and safety of regional epidural anesthesia and general anesthesia in patients who underwent PCNL. Materials and Methods: Fifty patients submitted to percutaneous nephrolithotomy (PCNL) were randomized into two groups: Group I (N = 26) received general anesthesia and Group II (N = 24) received regional epidural anesthesia. Demographic and operative data including age, BMI, stone position, stone size, postoperative pain, amount of postoperative analgesic usage, length of hospital stay, patient satisfaction, preoperative and postoperative hemoglobin and hematocrit, adverse effects and surgical complications were compared between both groups. Results: Average pain score at 1 hour. was 6.88 in group I and 3.12 in group II (p < 0.001), at 4 hours. 5.07 in group I and 3.42 in group II (p = 0.025). Less morphine was required in the regional epidural anesthesia group compared to the general anesthesia group. Higher satisfaction was found in the regional epidural group. 6 (23.07%) patients in Group I and 1 patient (4.19%) in Group II had postoperative nausea and vomiting, respectively (p = 0.05). Pain score at 12 hours, 24 hours, 48 hours, 72 hours, preoperative and postoperative hemoglobin and hematocrit, length of hospital stay, and adverse effects were no different between the two groups. Conclusion: Regional epidural anesthesia is an alternative technique for PCNL which achieves more patient satisfaction, less early postoperative pain and less adverse effects from medication with the same efficacy and safety compared to general anesthesia.


Cheewangkoon R.,Chaing Mai University | Groenewald J.Z.,Fungal Biodiversity Center | Verkley G.J.M.,Fungal Biodiversity Center | Hyde K.D.,Mae Fah Luang University | And 7 more authors.
Fungal Diversity | Year: 2010

Cryptosporiopsis eucalypti is a common follicolous pathogen of Eucalyptus species in tropical and temperate regions where these trees are grown in plantations. The taxonomy of C. eucalypti is confused by the fact that it is phylogenetically unrelated to the type species of Cryptosporiopsis (Cryptosporiopsis nigra = C. scutellata, Helotiales). The aim of this study was to resolve the taxonomic position of C. eucalypti based on morphology and phylogenetic inference. Thirty-two Eucalyptus leaf samples with symptoms typical of C. eucalypti infection were collected from 10 tropical and temperate countries across four continents. Cultures were established from single conidia, as well as from ascospores of a previously unreported teleomorph state. DNA sequences were obtained for the 28 S nrDNA, the internal transcribed spacers of the nrDNA operon, and beta-tubulin regions to determine generic and species-level relationships. DNAsequence analysis showed that conidial and ascospore isolates of C. eucalypti have low intraspecific variation, although two collections from Australia and one from Uruguay represented two novel taxa. Based on the newly collected teleomorph stage, as well as the phylogenetic data, C. eucalypti is shown to represent a new genus closely related to Plagiostoma (Gnomoniaceae, Diaporthales) for which the names Pseudoplagiostoma gen. nov. and Pseudoplagiostomaceae fam. nov. (Diaporthales) are introduced. Two new species of Cryptosporiopsis (Dermateaceae, Helotiales) on Eucalyptus from Australia and California (USA) are also described. © 2010 Kevin D. Hyde.


Cheewangkoon R.,Chaing Mai University | Groenewald J.Z.,Fungal Biodiversity Center | Hyde K.D.,Mae Fah Luang University | Hyde K.D.,King Saud University | And 2 more authors.
Mycological Progress | Year: 2012

Chocolate Spot leaf disease of Eucalyptus is associated with several Heteroconium-like species of hyphomycetes that resemble Heteroconium s. str. in morphology. They differ, however, in their ecology, with the former being plant pathogenic, while Heteroconium s. str. is a genus of sooty moulds. Results of molecular analyses, inferred from DNA sequences of the large subunit (LSU) and internal transcribed spacers (ITS) region of nrDNA, delineated four Heteroconium-like species on Eucalyptus, namely H. eucalypti, H. kleinziense, Alysidiella parasitica, and one isolate resembling a novel species in a clade separate from the holotype of Heteroconium, H. citharexyli. Based on molecular phylogeny, morphology and ecology, the Heteroconium-like species associated with Chocolate Spot disease are reclassified in the genus Alysidiella, which is shown to have mycelium that is immersed in and superficial on the host tissue and conidiogenous cells that can have loci that are either inconspicuous or proliferating percurrently. Furthermore, conidiogenous cells can either occur solitary on hyphae, or be sporodochial, arranged on a weakly developed stroma, which further distinguishes Alysidiella from Heteroconium. © 2010 The Author(s).


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.


Tantraworasin A.,Chaing Mai University | Lertprasertsuke N.,Chaing Mai University | Kongkarnka S.,Chaing Mai University | Euathrongchit J.,Chaing Mai University | And 2 more authors.
Asian Pacific Journal of Cancer Prevention | Year: 2014

Background: Anaplastic lymphoma kinase (ALK) gene rearrangement in non-small cell lung cancer (NSCLC) has been intensively studied. The gold standard for ALK detection is FISH, but this is not routinely conducted in clinical practice, so that the IHC method has a role. The aim of this study was to identify the incidence of ALK rearrangement and risk or prognostic factors for ALK positivity using both of IHC and FISH methods. Materials and Methods: From January 2008 to December 2012, 267 completely resected NSCLC patients in Chiang Mai University Hospital were enrolled in this study. Clinical and pathological variables and outcomes of treatment were retrospectively reviewed. IHC and FISH were used to evaluate ALK rearrangement. Sensitivity and specificity of IHC were analyzed. Multivariable analysis was used to identify clinico-pathological correlations with positive results of IHC and clinical outcomes. Results: Twenty-two (8.2%) of 267 specimens were IHC-positive for ALK with intense cytoplasmic staining, whereas only 10 (3.8%) were FISH-positive. Sensitivity, specificity and the positive likelihood ratio with IHC were 80.0%, 94.9%, and 15.8 respectively. Age less than 55 years (RR 4.4, 95%CI 1.78-10.73, p value=0.001) and presence of visceral pleural invasion (VPI) (RR 2.9, 95%CI 1.21-6.78, p value =0.017) were identified as risk factors for ALK rearrangement with FISH. There were no statistically significant differences in other clinical and pathological variables. ALK rearrangement was not a prognostic factor for tumor recurrence or overall survival. Conclusions: The incidences of ALK positivity in completely resected NSCLCs in northern Thailand were 8.2% by IHC and 3.8% by FISH. IHC with mouse monoclonal, Ventana D5F3 antibody can be used as a screening tool before FISH method because of high specificity and high positive likelihood ratio. Age less than 55 years and VPI are risk factors for ALK positivity.


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.


PubMed | Walailak University, Chaing Mai University and Khon Kaen University
Type: Journal Article | Journal: 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.


PubMed | Chaing Mai University
Type: Comparative Study | Journal: International braz j urol : official journal of the Brazilian Society of Urology | Year: 2012

To compare the efficacy and safety of regional epidural anesthesia and general anesthesia in patients who underwent PCNL.Fifty patients submitted to percutaneous nephrolithotomy (PCNL) were randomized into two groups: Group I (N = 26) received general anesthesia and Group II (N = 24) received regional epidural anesthesia. Demographic and operative data including age, BMI, stone position, stone size, postoperative pain, amount of postoperative analgesic usage, length of hospital stay, patient satisfaction, preoperative and postoperative hemoglobin and hematocrit, adverse effects and surgical complications were compared between both groups.Average pain score at 1 hour. was 6.88 in group I and 3.12 in group II (p < 0.001), at 4 hours. 5.07 in group I and 3.42 in group II (p = 0.025). Less morphine was required in the regional epidural anesthesia group compared to the general anesthesia group. Higher satisfaction was found in the regional epidural group. 6 (23.07 %) patients in Group I and 1 patient (4.19 %) in Group II had postoperative nausea and vomiting, respectively (p = 0.05). Pain score at 12 hours, 24 hours, 48 hours, 72 hours, preoperative and postoperative hemoglobin and hematocrit, length of hospital stay, and adverse effects were no different between the two groups.Regional epidural anesthesia is an alternative technique for PCNL which achieves more patient satisfaction, less early postoperative pain and less adverse effects from medication with the same efficacy and safety compared to general anesthesia.

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