Chiang Mai Journal of Science最新文献_第8页

Inhibition of Lasiodiplodia pseudotheobromae Causing Fruit Rot Disease of Longan by Using Antagonistic Bacillus siamensis RFCD306 拮抗暹罗芽孢杆菌RFCD306对龙眼果腐病的抑制作用

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2023-01-31 DOI: 10.12982/cmjs.2023.004

Aimalin Pipattanapuckdee, P. Seehanam, C. Tiyayon, Danai Boonyakait, K. Kunasakdakul, Salit Supakitthanakorn, O. Ruangwong

{"title":"Inhibition of Lasiodiplodia pseudotheobromae Causing Fruit Rot Disease of Longan by Using Antagonistic Bacillus siamensis RFCD306","authors":"Aimalin Pipattanapuckdee, P. Seehanam, C. Tiyayon, Danai Boonyakait, K. Kunasakdakul, Salit Supakitthanakorn, O. Ruangwong","doi":"10.12982/cmjs.2023.004","DOIUrl":"https://doi.org/10.12982/cmjs.2023.004","url":null,"abstract":"P ostharvest fruit rot disease of longan (Dimocarpus longan Lour.) caused by Lasiodiplodia pseudotheobromae is one of the most devastating problems for longan production in Thailand. To reduce the use of chemicals, the endophytic bacterium was isolated from healthy longan fruit for using as a biological control agent. The antagonistic bacterium Bacillus siamensis isolate RFCD306 which was identified based on morphological, biochemical and molecular characterization. It showed the antifungal effect with 94.40% of fungal growth inhibition which was conducted by a dual culture method. The efficacy of B. siamensis RFCD306 on the inhibition of fungal growth and conidial germination was observed under the scanning electron microscope (SEM) and revealed the abnormal germination of conidial and hyphal growth. Moreover, four antibiotic synthesis-related genes consisting of srfA, ituA, bacD and bymA were detected from B. siamensis RFCD306 by a polymerase chain reaction (PCR) technique. These genes might be involved in the antifungal activity of the antagonistic bacterium. Furthermore, the disease control efficiency of B. siamensis RFCD306 was evaluated on harvested longan fruits and showed that the bacterium decreased the incidence of fruit rot disease. Therefore, this study represented the effective B. siamensis RFCD306 for using as a biological agent in controlling postharvest fruit rot disease of longan.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"57 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85027298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of Porous Silica Nanoparticles by Chemical Etching for Removal of Paraquat from Aqueous Solution 化学蚀刻法制备多孔二氧化硅纳米颗粒去除水中百草枯

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2023-01-31 DOI: 10.12982/cmjs.2023.009

Kanokwan Darasoon, Supawitch Hoijang, Tanapong Kunakham, Sorapong Janhom, S. Ananta, Gyu Leem, L. Srisombat

{"title":"Preparation of Porous Silica Nanoparticles by Chemical Etching for Removal of Paraquat from Aqueous Solution","authors":"Kanokwan Darasoon, Supawitch Hoijang, Tanapong Kunakham, Sorapong Janhom, S. Ananta, Gyu Leem, L. Srisombat","doi":"10.12982/cmjs.2023.009","DOIUrl":"https://doi.org/10.12982/cmjs.2023.009","url":null,"abstract":"In t his study, solid silica nanoparticles (sSiO2 NPs) were chemically etched using sodium hydroxide solution as an etchant to synthesize porous silica nanoparticles (pSiO2 NPs). Etchant dosage and etching time were optimized to obtain the optimum etching condition providing the effective removal of paraquat (PQ). High removal efficiency of PQ by the synthesized pSiO2 NPs was obtained over 90% using 11.1 mL of 1.25 M NaOH and 12 h for the etching process. SEM and TEM images showed that the porosity of pSiO2 NPs increased with increase of the etchant dosage and etching time. The increment of porosity of pSiO2 NPs enhanced the PQ removal efficiency. FTIR result indicated that the characteristic functionalities of silica remain after the etching process. After optimum condition of etching obtained, the adsorption behavior of PQ was investigated. Several key factors influencing the adsorption efficiency, i.e., initial solution pH, initial concentration, and adsorption time were optimized. The maximum removal efficiency of PQ (~98%) by the pSiO2 nanoadsorbent was obtained using 100 mg L-1 of PQ solution at pH ~7 within 5 minutes. The maximum adsorption capacity (qmax) of the pSiO2 NPs for the PQ removal was 65.7 mg g-1. The pSiO2 nanoadsorbent is effective adsorbent for the PQ removal due to the development of a facile synthetic method for adsorbent preparation, rapid adsorption process, and comparable qmax value with other PQ adsorbents.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"26 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89412498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

N, N-Dimethylformamide-assisted One-step Synthesis of Fe Doped Hierarchical Flower-like BiOCOOH with Enhenced Photocatalytic Activity N, N-二甲基甲酰胺辅助一步合成具有增强光催化活性的Fe掺杂层次型花状生物ocooh

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2023-01-31 DOI: 10.12982/cmjs.2023.007

Piao Chen, Mingqing Shan, Xiongjian Li, Shuijin Yang, Yun Yang

引用次数: 0

Hydrochar from Lansium domesticum and Salacca zalacca Peel as Adsorbent on Rhodamine-B Removal: Adsorption Process and Regeneration Studies 家槐和萨拉卡果皮碳氢化合物对罗丹明- b的吸附及再生研究

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-11-30 DOI: 10.12982/cmjs.2022.108

Mauizatul Hasanah, A. Wijaya, R. Mohadi, F. Arsyad, A. Lesbani

{"title":"Hydrochar from Lansium domesticum and Salacca zalacca Peel as Adsorbent on Rhodamine-B Removal: Adsorption Process and Regeneration Studies","authors":"Mauizatul Hasanah, A. Wijaya, R. Mohadi, F. Arsyad, A. Lesbani","doi":"10.12982/cmjs.2022.108","DOIUrl":"https://doi.org/10.12982/cmjs.2022.108","url":null,"abstract":"Utilization of duku (Lansium domesticum) peel and salak (Salacca zalacca) peel as rhodamine-B adsorbent was investigated by producing it into hydrochar of duku peel and hydrochar of salak peel by hydrothermal carbonization at 150 °C for 6 hours. XRD shows hydrochar was an amorphous solid (angle of 2ϴ at 30 deg (002)). FTIR characterization of hydrochar showed that hydrochar had the main constituent of the raw material biomass with detected functional groups in the form of -OH, -CH, C=O, and C-O. Wavenumber at FTIR was shifted after adsorption indicated adsorption of rhodamine-B by adsorbent with changes in the structure. Duku peel increased surface area after being hydrochar from 12.343 m2/g to 21.019 m2/g, but salak peel had decreased in surface area from 62.676 m2/g to 23.121 m2/g. The maximum adsorption capacity of duku peel is 58.824 mg/g at 30 °C, HC of duku peel is 114.943 mg/g at 70 °C and salak peel is 92.593 at 30 °C, HC of salak peel is 102.041 mg/g at 30 °C. In this study, the adsorption kinetics and isotherm models follow the PSO kinetic model and Langmuir isotherm with an endothermic and spontaneous adsorption process. Adsorption efficiency in the regeneration process increases from fruit peel to hydrochar and can be used repeatedly in the regeneration process for 3 cycles.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"340 3","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72560625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of Expanded Perlite Board for Thermal Insulation 保温用膨胀珍珠岩板的研制

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-11-30 DOI: 10.12982/cmjs.2022.098

N. Keawprak, P. Arkom, Pracha Lao-auyporn, Nikorn Kaewpreak, P. Wannasut, A. Watcharapasorn

{"title":"Development of Expanded Perlite Board for Thermal Insulation","authors":"N. Keawprak, P. Arkom, Pracha Lao-auyporn, Nikorn Kaewpreak, P. Wannasut, A. Watcharapasorn","doi":"10.12982/cmjs.2022.098","DOIUrl":"https://doi.org/10.12982/cmjs.2022.098","url":null,"abstract":"In this study, the perlite-based insulating material is developed to meet ASTM C610 standards in a form of the board. Expanded perlite powders with a tapped density of 53 and 150 kg/m³ were used in this study. Sodium silicate used as a proper binder at various concentrations was mixed with perlite powders. The homogeneous moist mixture was formed by uniaxial pressing at different compaction ratios. Specimens were dried at low temperatures (250-400°C). Measurements of physical properties e.g., fl exural strength, bulk density and thermal conductivity, were conducted. Perlite foam was set after drying, leading to an increase in its moisture resistance and strength. Compression molding also affected the density and strength of the products. Heat treatment after forming was carried out in order to dehydrate water molecules and bond particles together. The specimens were tested in accordance with ASTM C610 as a result of optimum conditions from perlite powder with a tapped density of 53 kg/m3. Perlite foam board had been successfully fabricated with a bulk density of 205 kg/m3, fl exural strength of 434 kPa, compressive strength of 764 kPa and room temperature thermal conductivity of 0.056 W/m.K.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"11 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88202501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Housing Price Prediction by Divided Regression Analysis 基于分割回归分析的房价预测

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-11-30 DOI: 10.12982/cmjs.2022.102

Y. Goh, Y. Goh, Chun-Chieh Yip, K. Ng

{"title":"Housing Price Prediction by Divided Regression Analysis","authors":"Y. Goh, Y. Goh, Chun-Chieh Yip, K. Ng","doi":"10.12982/cmjs.2022.102","DOIUrl":"https://doi.org/10.12982/cmjs.2022.102","url":null,"abstract":"Regression analysis is a statistical methodology to investigate the relationship between the dependent variable and the independent variables. In current era with the trend of big data, we might face some problems when performing statistical analysis for the massive volume of data. For example, the heavy burden of the computing load will cause the computation to be time consuming, the accuracy of the results might be affected in view of the vast volume of data. Hence, divided regression analysis is proposed to reduce the burden of the computing load. This approach performs subdivision of the dataset into several unique subsets, then the multiple linear regression is fi tted into each subset. The results obtained from each subset are then combined to obtain a divided regression model which is treated as the original overall dataset. The dataset used in this paper is KC Housesales Data, obtained from the Kaggle website. The dataset contains statistics information about the housing price, for example, size of lot, size of living area and selling price of the house. The goal of this paper is to predict the selling price of a house from the given attributes. The dataset is partitioned into fi ve subsets. Consequently, multiple linear regression is fi tted for each subset. Then, some model adequacy checking will be applied on the models. The test in determining the existence of multicollinearity in the models is rather important as well because the collinearity among the independent variables will affect the overall results. Hence, the variance infl ation factor (VIF) approach is used to determine the existence of multicollinearity. Finally, the divided regression model is obtained by combining results from all the subsets and the validity of divided regression model is verifi ed.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"58 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90562175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of Surface Roughness and Tool Wear during Machining of AMMC using Taguchi Technique 田口法优化AMMC表面粗糙度和刀具磨损

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-11-30 DOI: 10.12982/cmjs.2022.095

Srinivasan Surendran, T. Sundaram, S. Kumar P.

引用次数: 0

Brown Rot Disease Caused by Trichoderma hamatum on the Edible Lily, Lilium leichtlinii var. maximowiczii 肉芽木霉对食用百合褐腐病的影响

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-11-30 DOI: 10.12982/cmjs.2022.103

Chun-lan Zhang, Bo Zhang, X. Yang, Odeshnee Naicker, Lei Zhao

{"title":"Brown Rot Disease Caused by Trichoderma hamatum on the Edible Lily, Lilium leichtlinii var. maximowiczii","authors":"Chun-lan Zhang, Bo Zhang, X. Yang, Odeshnee Naicker, Lei Zhao","doi":"10.12982/cmjs.2022.103","DOIUrl":"https://doi.org/10.12982/cmjs.2022.103","url":null,"abstract":"Lilium leichtlinii var. maximowiczii is commonly known as the edible lily or sweet lily. Bulbs of this edible lily are frequently used in traditional Chinese medicine, and they are revered for their nutritional content. As of 2018, brown rot disease on cultivated L. leichtlinii var. maximowiczii bulbs has become a disease of concern in Jilin Province, China, with a disease incidence of 29.43%. The bulbs infected with brown rot disease appear as large, regularly shaped, and yellow-brown or black-brown lesions. However, the causal agent is not yet known. Therefore, this study aims to confi rm both the causal pathogen by using Koch’s postulates and to further establish, to the species level, the identity of this organism via morphological and molecular methods. The pathogen was later identifi ed as Trichoderma hamatum. Healthy bulbs were inoculated with T. hamatum, which produced the initial disease symptoms with brown spots appearing at the inoculation sites; the same pathogen was then isolated again from diseased bulbs. To the best of our knowledge, this is the fi rst report of bulb rot disease of cultivated L. leichtlinii var. maximowiczii caused by T. hamatum in China. Our work may be benefi cial, especially for designing control measures for bulb rot disease in the commercial cultivation of L. leichtlinii var. maximowiczii.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"144 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79718133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Carbonylacrylic Derivatives and Their Ability to Disrupt Biofi lm Formation 羰基丙烯酸衍生物及其破坏生物膜形成的能力

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-11-30 DOI: 10.12982/cmjs.2022.099

Pattarapon Pumirat, Thunchanok Tansutat, Chutima Jiarpinitnun

{"title":"Carbonylacrylic Derivatives and Their Ability to Disrupt Biofi lm Formation","authors":"Pattarapon Pumirat, Thunchanok Tansutat, Chutima Jiarpinitnun","doi":"10.12982/cmjs.2022.099","DOIUrl":"https://doi.org/10.12982/cmjs.2022.099","url":null,"abstract":"The rapid emergence of bacterial resistance to antibiotics has greatly pressed the need for novel therapeutics. One of the strategies bacteria use to enhance their resistance toward antibiotics is to embed themselves into polymeric matrices known as a biofi lm. Bacteria in a biofi lm state are highly resistant towards antibiotics and immune response, thereby more diffi cult to eradicate. Hence, antibiofi lm agents are considered an alternative strategy to unravel problems regarding bacterial antibiotic resistance. Our lab has focused on bacterial communication process called quorum sensing (QS), which is crucial for bacteria to conduct group behaviors such as biofi lm. Cysteine residue of LasR, key QS protein regulator, has been suggested to play an important role in QS-mediated biofi lm formation. In addition, cysteine-containing biomolecules have been implicated in bacterial pathogenesis. Herein, we explored the ability of thiol-reactive molecules for their ability to interfere with biofi lm formation in pathogenic Gram-negative Pseudomonas aeruginosa (P. aeruginosa). We hypothesized that the thiol-reactive molecules could potentially react with sulfhydryl group of cysteine residue of crucial QS enzyme or of cysteine-containing biomolecules that may lead to the reduce in the ability of the pathogen to form biofi lm. Carbonylacrylic compounds were previously reported to rapidly undergo thiol-Michael reaction with cysteine-containing proteins under physiological conditions. Total of three new carbonylacrylic derivatives were synthesized and tested for their anti-biofi lm activity. All synthesized compounds could inhibit biofi lm formation in a concentration-dependent manner without toxicity to bacteria. Derivative 1a exhibited the most potent antibiofi lm activity with IC50 of 85 μM.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"9 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84234820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Production of Polyhydroxybutyrate (PHB) by Novel Bacillus megaterium SWU01 Isolated from Activated Sludge 从活性污泥中分离的新型巨芽孢杆菌SWU01生产聚羟基丁酸酯(PHB)

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2022-11-30 DOI: 10.12982/cmjs.2022.109

Wisan Chuavong, Sirikwan Ponprateep, Pravech Ajawatanawong, Tipachai Vatanavicharn

{"title":"Production of Polyhydroxybutyrate (PHB) by Novel Bacillus megaterium SWU01 Isolated from Activated Sludge","authors":"Wisan Chuavong, Sirikwan Ponprateep, Pravech Ajawatanawong, Tipachai Vatanavicharn","doi":"10.12982/cmjs.2022.109","DOIUrl":"https://doi.org/10.12982/cmjs.2022.109","url":null,"abstract":"Polyhydroxybutyrate (PHB) is a natural polymer accumulated in granules as intracellular energy storage in stress condition. The aim of this research was to isolate potential PHB producing bacteria from canned tuna wastewater activated sludge and cow dung. Five positive bacterial isolates were confi rmed the accumulation of PHB using lipophilic staining and TEM. To identify the bacterial species, the phylogenetic analyses inferred from 16S rDNA gene sequence demonstrated that the bacterial strains were closely related to Bacillus genera. The comparison of PHB production from bacterial isolates showed that SWU01 strain isolated from the activated sludge exhibited the highest yield of PHB production. The cultivation of SWU01 stain in optimization condition (modifi ed M9 medium supplemented with 2% sodium acetate and 0.5% yeast extract at pH 7 for 48 h) exhibited the yield of PHB up to 0.95 g/L or 7.5 compared with M9 medium supplemented with 2% glucose. Transmission electron micrograph showed high among of PHB in the granule of the bacterial cell. From all results, the bacterial strain SWU01, effi cient PHB producers, exhibited the potential for their utilization in commercial PHB production.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"47 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85431200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0