Chiang Mai Journal of Science最新文献_第6页

Strategies for Producing Reliable Trends Forecasting of COVID-19 Pandemic in Malaysia using Dynamic Mode Decomposition 基于动态模式分解的马来西亚COVID-19大流行可靠趋势预测策略

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2023-05-31 DOI: 10.12982/cmjs.2023.026

Noor Atinah Ahmad, Nurul Ashikin Othman

{"title":"Strategies for Producing Reliable Trends Forecasting of COVID-19 Pandemic in Malaysia using Dynamic Mode Decomposition","authors":"Noor Atinah Ahmad, Nurul Ashikin Othman","doi":"10.12982/cmjs.2023.026","DOIUrl":"https://doi.org/10.12982/cmjs.2023.026","url":null,"abstract":"Dynamic Mode Decomposition (DMD) with time delay embedding is used to predict dynamic patterns in univariate time series. An important pattern that can be extracted using DMD is the trend or global change in a time series which is useful for producing reliable forecast. DMD utilizes the computationally effi cient singular value decomposition (SVD) to produce a low rank approximation of the linear operator that brings about the dynamic patterns in the time series. Trend in the time series is translated as dynamic modes of the operator with low frequencies. The time evolution of this low frequency pattern produces forecast of the time series. In this paper, we outline the strategies for extracting trend component from COVID-19 time series of Malaysia. It is discovered that, other than identifying modes with slow varying frequencies, we need to also resolve the time stamp delay, so that mean-square error of the reconstructed time series is minimal. Information of the magnitude and phase of DMD modes are useful to identify persistent patterns and remove nonstationary ones. We compare the performance of DMD with another SVD-based method which is the singular spectrum analysis (SSA) and our results highlight certain fundamental difference between these two methods. The forecasts from SSA tend to lean towards the direction of maximum variance, producing low reconstruction error but slow to detect sudden changes in the time series. On the other hand, forecasts from DMD captures the phases of dominant modes that dictates the overall global pattern, hence providing a better prediction of future dynamics of the time series.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"27 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81419044","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

Efficacy of Dried Indian Gooseberry Kombucha on a Pre–industrial Scale: Chemical Composition, Antioxidant and Antibacterial Activity 工业前规模下干印度醋栗康普茶的功效:化学成分、抗氧化和抗菌活性

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2023-05-31 DOI: 10.12982/cmjs.2023.034

Tharinee Klawpiyapamornkun, Thida Kaewkod, Toungporn Uttarotai, S. Wangkarn, P. Sirisa-ard, Suwalee Kiatkarun, Y. Tragoolpua, S. Bovonsombut

{"title":"Efficacy of Dried Indian Gooseberry Kombucha on a Pre–industrial Scale: Chemical Composition, Antioxidant and Antibacterial Activity","authors":"Tharinee Klawpiyapamornkun, Thida Kaewkod, Toungporn Uttarotai, S. Wangkarn, P. Sirisa-ard, Suwalee Kiatkarun, Y. Tragoolpua, S. Bovonsombut","doi":"10.12982/cmjs.2023.034","DOIUrl":"https://doi.org/10.12982/cmjs.2023.034","url":null,"abstract":"Kombucha is a fermented tea beverage that has gained popularity in recent years due to its potential health benefi ts. In this study, dried Indian gooseberry kombucha (DIGK) was produce on a pre-industrial-scale for 20 days and compare with traditional kombucha (TK) made from green tea. Both products were produced as concentrated kombucha and investigated for their total phenolic content (TPC), total fl avonoid content (TFC), antioxidant activity, organic acids, and antimicrobial activity. The results revealed that DIGK had signifi cantly higher total phenolic compounds (with 5.97 ± 0.21 mg GAE/ml), fl avonoids (with 4.65 ± 0.20 mg QE/ml), and antioxidant activity (11.3-13.5 times) than traditional kombucha TK. The glucuronic, ascorbic and acetic acid of DIGK was higher than TK, while gluconic and D-saccharic acid-1,4-lactone (DSL) were lower than TK. The chemical properties in kombucha increased after the production of concentrated kombucha. The order of increasing values for TPC and antioxidant activity was as follows: concentrated DIGK > DIGK > concentrated TK > TK. Additionally, the determined TFC values showed that the order of increasing values was concentrated DIGK > concentrated TK > DIGK > TK. The concentrated kombucha showed higher antimicrobial activity against pathogenic enteric bacteria than the non-concentrated kombucha, with DIGK had higher activity than TK.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"5 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88831407","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

A New Edible Species of Cystodermella (Agaricaceae, Agaricales) from Mexico 标题墨西哥香菇科香菇属一新种

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2023-05-31 DOI: 10.12982/cmjs.2023.020

Olivia Ayala Vásquez, Susana Moreno-Solís, M. Martínez-Reyes, Joan Windhoek Olvera- Noriega, J. Pérez‐Moreno

引用次数: 0

Biocontrol of Colletotrichum falcatum Causing Red Rot Disease of Sugarcane Using Non-toxigenic Aspergillus sp. 非产毒曲霉防治甘蔗红腐病的研究。

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2023-05-31 DOI: 10.12982/cmjs.2023.032

Atcharaporn Srijudanu, O. Piasai, W. Leesutthiphonchai, Mattana Wanitch, C. Chaisiri, N. Khewkhom

{"title":"Biocontrol of Colletotrichum falcatum Causing Red Rot Disease of Sugarcane Using Non-toxigenic Aspergillus sp.","authors":"Atcharaporn Srijudanu, O. Piasai, W. Leesutthiphonchai, Mattana Wanitch, C. Chaisiri, N. Khewkhom","doi":"10.12982/cmjs.2023.032","DOIUrl":"https://doi.org/10.12982/cmjs.2023.032","url":null,"abstract":"Red rot disease caused by Colletotrichum falcatum is a major production threat to several sugarcane varieties in Thailand. Biological control is an ecologically friendly alternative to manage the disease using microbial antagonism and associated metabolic products. In this study, four Aspergillus non-toxigenic strains (A37, A374, A400, and A561) were characterized using a genetic approach and evaluated for their antagonistic potential to suppress the growth of C. falcatum. The strain A561 had the maximum number of gene deletions, with 12 afl atoxin-producing genes being lost. In addition, the non-toxigenic characteristic of A561 was confi rmed using afl atoxin B1 (AFB1) enzyme-linked immunosorbent assay. A561 reduced the concentration of AFB1 by 98.57% (1.63 μg/kg) relative to the toxigenic control. The antagonistic activity of A561 was evaluated against C. falcatum using the competition plate method on potato dextrose agar (PDA) in vitro. The results revealed that A561 inhibited the mycelial growth of C. falcatum by 34.39%. In addition, 10% (v/v) culture fi ltrate of A561 on PDA produced mycelial inhibition of 53.21%. Non-toxigenic A561 had antifungal potential, suppressing the growth of C. falcatum.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"38 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73759445","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

Introducing Nigrograna wuhanensis sp. nov. (Nigrogranaceae, Pleosporales) from Camellia japonica in China 中国山茶属植物武汉黑麦的引种(黑麦科，多孢子目)

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2023-05-31 DOI: 10.12982/cmjs.2023.025

Yong-xin Shu, Ruo-Lin Cheng, Jia-lin Huang, Kaiqin Li, Siyang Zhao, Hai-jun Zhao, W. Dong, Zhangyong Dong, M. Doilom, Biao Xu

引用次数: 0

New Access to Nano[Mn]-Pyranopyrazole[2,3-c]dichloride Series As a Nano-Structured Schiff-Base Complex 纳米[Mn]-吡喃吡唑[2,3-c]二氯代纳米结构席夫碱配合物的新途径

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2023-03-31 DOI: 10.12982/cmjs.2023.017

M. F. Mohammat, F. E. Bouchamma, Fatin Nur Ain Abdul Rashid, Muhammad Siddiq Maarop, Mohd Abdul Fatah Abdul Manan

{"title":"New Access to Nano[Mn]-Pyranopyrazole[2,3-c]dichloride Series As a Nano-Structured Schiff-Base Complex","authors":"M. F. Mohammat, F. E. Bouchamma, Fatin Nur Ain Abdul Rashid, Muhammad Siddiq Maarop, Mohd Abdul Fatah Abdul Manan","doi":"10.12982/cmjs.2023.017","DOIUrl":"https://doi.org/10.12982/cmjs.2023.017","url":null,"abstract":"A series of novel nano-structured manganese pyranopyrazole Schiff base complex (3a-l) has been synthesized and described. This synthetic complexation involved sequential reactions of domino four-component one-pot reaction for the template of pyranopyrazole (1), imination reaction (2) and finally completed by the complexation reaction with manganese to furnish the title compounds (3a-l). The salient of this nano-Schiff base synthetic reaction protocol is that diverse chemical functionalities were successfully incorporated, simple reaction protocol, and easy workup procedure to yield the title compounds from reasonable to moderate yield. All synthesized compounds were characterized by means of NMR, FTIR, EDX, and elemental analyzer, and by comparing the acquired spectra with the literature precedent for different manganese complexes. These findings revealed that the pyranopyrazole derivatives were successfully complexed with manganese to generate nano-Mn-Schiff base compounds. Further complexation of these derivatives generated 12 novel types of the title compounds (3a-l), which can then be subjected for future chemical applications.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"14 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80858998","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

A New Record of Neohelicosporium guangxiense and Its Secondary Metabolites 广仙新螺旋孢及其次生代谢产物新记录

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2023-03-31 DOI: 10.12982/cmjs.2023.010

Lijuan Zhang, Jian-Guo Ma, Xiaoyan Ma, Xiaotian Feng, Xuesong Bai, Yongtao Huang, R. Jayawardena, A. Mapook, Ji‐Chuan Kang, Yongzhong Lu

引用次数: 0

An Update on Species Diversity, Distribution and Sequence Data of Tulostoma in Asia with the Addition of Tulostoma exasperatum, A New Record for Thailand 亚洲Tulostoma物种多样性、分布和序列数据的最新进展——泰国新记录的恼怒Tulostoma

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2023-03-31 DOI: 10.12982/cmjs.2023.018

S. Paloi, N. Suwannarach, J. Kumla, Wiphawanee Phonrob, S. Karunarathna, S. Lumyong

引用次数: 1

Experimental and Semi-Phenomenological Investigation on Sound Absorption Performance of Natural Granular Sound Absorber: A Case Study on Rice Bran Composites 天然颗粒状吸声材料吸声性能的实验与半现象学研究——以米糠复合材料为例

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2023-03-31 DOI: 10.12982/cmjs.2023.015

P. Chanlert, Wiparat Manoma, Aneeta Jintara, Thanate Kerdkaew, T. Sutthibutpong

{"title":"Experimental and Semi-Phenomenological Investigation on Sound Absorption Performance of Natural Granular Sound Absorber: A Case Study on Rice Bran Composites","authors":"P. Chanlert, Wiparat Manoma, Aneeta Jintara, Thanate Kerdkaew, T. Sutthibutpong","doi":"10.12982/cmjs.2023.015","DOIUrl":"https://doi.org/10.12982/cmjs.2023.015","url":null,"abstract":"The sound absorption performance of rice bran composites was quantitatively investigated through an improved semi-phenomenological approach. Rice bran (RB) was employed as the primary and structural component in the creation of granular-type sound absorbers with urea-formaldehyde (UF) adhesive. The sound absorption coefficient (SAC) was measured by the two-microphone impedance tube method. Samples with a rice bran per volume ratio lower than 253 kg/m3 show peak-valley characteristics in the saturation region of their SAC spectrum. Five non-acoustic parameters for each sample were obtained by direct measurement and fitting the experimental SACs to the semi-phenomenological Johnson-Champoux-Allard (JCA) equivalent fluid model using the least-squares fitting method. Samples with higher proportions of RB demonstrate lower porosity (ϕ), viscous characteristic length (Λ), and thermal characteristic length (Λ'). Flow resistivity (σ) was the only parameter that noticeably increases when RB increased while tortuosity (α_∞) did not show a strong correlation. For the uncertainty analysis of the experimental SAC, multivariate method was used in this study. A new model (NM) was predicated on the power-law relation introduced by Delany and Bazley, in which the SAC was a function of flow resistivity alone. The new model predicted the SAC of RB composites more precisely than the standard Delany-Bazley model (¯Δ_\"abs(DBM)\" ≈4.0¯Δ_\"abs(NM)\" ). The proposed model had the potential to be extended into a more unified empirical model of SAC for granular-typed sound absorbers in future investigations with a broader spectrum of granular materials.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"16 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83635970","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

Transcriptome Study of Cold Plasma Treated Pseudomonas aeruginosa 冷等离子体处理铜绿假单胞菌的转录组研究

IF 0.4 4区综合性期刊

Chiang Mai Journal of Science Pub Date : 2023-03-31 DOI: 10.12982/cmjs.2023.014

Kok Jun Liew, Xinhua Zhang, Xiaohong Cai, Dongdong Ren, Wei Liu, Z. Chang, Chun Shiong Chong

{"title":"Transcriptome Study of Cold Plasma Treated Pseudomonas aeruginosa","authors":"Kok Jun Liew, Xinhua Zhang, Xiaohong Cai, Dongdong Ren, Wei Liu, Z. Chang, Chun Shiong Chong","doi":"10.12982/cmjs.2023.014","DOIUrl":"https://doi.org/10.12982/cmjs.2023.014","url":null,"abstract":"C old plasma is a disinfection technique widely used in food, agricultural, and medical industries. This work used cold plasma to sterilize Pseudomonas aeruginosa and cell survivability was determined. RNA sequencing was used to determine the bacterial responses at 1 minute (T1), 3 minutes (T3), and 5 minutes (T5) of cold plasma treatments. The results show that longer treatment leads to lower cell survivability. Cold plasma induced rapid cell responses in P. aeruginosa. Gene Ontology enrichment analysis showed that T5 had the most enriched terms compared to T1 and T3. The most affected genes were those involved in antioxidant production, transcriptional regulators, ribosome formation, transporters, chemotaxis, and cell motility. P. aeruginosa’s initial response (T1) to cold plasma involved the upregulation of antioxidant genes, followed by the downregulation of transcriptional regulators, transporters, chemotaxis, and cell motility as the intermediate response (T3), and the final response (T5) included heavy downregulation in ribosome formation. Previous transcriptome studies of cold plasma focused mainly on prokaryotic cells such as E. coli and B. subtilis, while studies on P. aeruginosa are limited. This study demonstrated the sequential response of P. aeruginosa against cold plasma via transcriptome analysis.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"46 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78541007","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