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.
{"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}
Tharinee Klawpiyapamornkun, Thida Kaewkod, Toungporn Uttarotai, S. Wangkarn, P. Sirisa-ard, Suwalee Kiatkarun, Y. Tragoolpua, S. Bovonsombut
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.
{"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}
Olivia Ayala Vásquez, Susana Moreno-Solís, M. Martínez-Reyes, Joan Windhoek Olvera- Noriega, J. Pérez‐Moreno
As part of our effort to study wild edible mushrooms from central Mexico. We collected two specimens of Cystodermella. Cystodermella mazahuensis is described as a new species from Mexico. This species has biocultural importance as food for the Mazahua people of the State of Mexico located in Central Mexico. Cystodermella mazahuensis differs from other related species by its small cheilocystidia (17–30 × 4–5 μm) and molecular phylogenetic analysis. This is the fourth edible species known in the genus Cystodermella along with C. cinnabarina, C. granulosa, and C. japonicum. Comprehensive descriptions, illustrations and molecular phylogeny of the nrITS region are provided.
{"title":"A New Edible Species of Cystodermella (Agaricaceae, Agaricales) from Mexico","authors":"Olivia Ayala Vásquez, Susana Moreno-Solís, M. Martínez-Reyes, Joan Windhoek Olvera- Noriega, J. Pérez‐Moreno","doi":"10.12982/cmjs.2023.020","DOIUrl":"https://doi.org/10.12982/cmjs.2023.020","url":null,"abstract":"As part of our effort to study wild edible mushrooms from central Mexico. We collected two specimens of Cystodermella. Cystodermella mazahuensis is described as a new species from Mexico. This species has biocultural importance as food for the Mazahua people of the State of Mexico located in Central Mexico. Cystodermella mazahuensis differs from other related species by its small cheilocystidia (17–30 × 4–5 μm) and molecular phylogenetic analysis. This is the fourth edible species known in the genus Cystodermella along with C. cinnabarina, C. granulosa, and C. japonicum. Comprehensive descriptions, illustrations and molecular phylogeny of the nrITS region are provided.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"64 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82235231","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}
Atcharaporn Srijudanu, O. Piasai, W. Leesutthiphonchai, Mattana Wanitch, C. Chaisiri, N. Khewkhom
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.
{"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}
Yong-xin Shu, Ruo-Lin Cheng, Jia-lin Huang, Kaiqin Li, Siyang Zhao, Hai-jun Zhao, W. Dong, Zhangyong Dong, M. Doilom, Biao Xu
In this study, we introduce a new species Nigrograna wuhanensis, which was collected from Camellia japonica in Hubei Province, China. The new species was established based on morphological characteristics and multi-locus phylogenetic analysis of combined SSU, LSU, ITS and tef1-α sequence data. Nigrograna wuhanensis is characterized by scattered, immersed ascomata with a long neck superfi cial on the substrate, clavate and short pedicellate asci, and fusoid, pale brown to dark brown, mostly 3-septate ascospores which are deeply constricted and strongly pigmented at the septa. Nigrograna wuhanensis differs from its phylogenetically related species N. jinghongensis in having 3-septate ascospores and a long neck growing on the ascomata. The illustration and description of the new taxon are provided.
{"title":"Introducing Nigrograna wuhanensis sp. nov. (Nigrogranaceae, Pleosporales) from Camellia japonica in China","authors":"Yong-xin Shu, Ruo-Lin Cheng, Jia-lin Huang, Kaiqin Li, Siyang Zhao, Hai-jun Zhao, W. Dong, Zhangyong Dong, M. Doilom, Biao Xu","doi":"10.12982/cmjs.2023.025","DOIUrl":"https://doi.org/10.12982/cmjs.2023.025","url":null,"abstract":"In this study, we introduce a new species Nigrograna wuhanensis, which was collected from Camellia japonica in Hubei Province, China. The new species was established based on morphological characteristics and multi-locus phylogenetic analysis of combined SSU, LSU, ITS and tef1-α sequence data. Nigrograna wuhanensis is characterized by scattered, immersed ascomata with a long neck superfi cial on the substrate, clavate and short pedicellate asci, and fusoid, pale brown to dark brown, mostly 3-septate ascospores which are deeply constricted and strongly pigmented at the septa. Nigrograna wuhanensis differs from its phylogenetically related species N. jinghongensis in having 3-septate ascospores and a long neck growing on the ascomata. The illustration and description of the new taxon are provided.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"69 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76528297","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}
M. F. Mohammat, F. E. Bouchamma, Fatin Nur Ain Abdul Rashid, Muhammad Siddiq Maarop, Mohd Abdul Fatah Abdul Manan
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.
{"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}
Lijuan Zhang, Jian-Guo Ma, Xiaoyan Ma, Xiaotian Feng, Xuesong Bai, Yongtao Huang, R. Jayawardena, A. Mapook, Ji‐Chuan Kang, Yongzhong Lu
In a diversity study of helicosporous hyphomycetes, a new record viz. Neohelicosporium guangxiense was collected, isolated and identified based on multi-gene phylogenetic analyses and morphological evidence. In this study, secondary metabolites of N. guangxiense were also investigated, from which four compounds were isolated and identified, including three α-tetralon derivatives (1-3) and one isocoumarin derivative (4). This is the first time that these compounds were isolated from the fungal genus Neohelicosporium, and compound 1 was firstly isolated from natural resources. Their structures were assigned based on the extensive 1D/2D NMR spectroscopic analyses, ESI-MS, and HR-ESI-MS measurements, especially the 2D NMR spectra of compound 1 were described in detail, and the absolute configuration of compound 1 was also elucidated for the first time. Furthermore, the bioactivities of all compounds were inactive in our bioassays.
{"title":"A New Record of Neohelicosporium guangxiense and Its Secondary Metabolites","authors":"Lijuan Zhang, Jian-Guo Ma, Xiaoyan Ma, Xiaotian Feng, Xuesong Bai, Yongtao Huang, R. Jayawardena, A. Mapook, Ji‐Chuan Kang, Yongzhong Lu","doi":"10.12982/cmjs.2023.010","DOIUrl":"https://doi.org/10.12982/cmjs.2023.010","url":null,"abstract":"In a diversity study of helicosporous hyphomycetes, a new record viz. Neohelicosporium guangxiense was collected, isolated and identified based on multi-gene phylogenetic analyses and morphological evidence. In this study, secondary metabolites of N. guangxiense were also investigated, from which four compounds were isolated and identified, including three α-tetralon derivatives (1-3) and one isocoumarin derivative (4). This is the first time that these compounds were isolated from the fungal genus Neohelicosporium, and compound 1 was firstly isolated from natural resources. Their structures were assigned based on the extensive 1D/2D NMR spectroscopic analyses, ESI-MS, and HR-ESI-MS measurements, especially the 2D NMR spectra of compound 1 were described in detail, and the absolute configuration of compound 1 was also elucidated for the first time. Furthermore, the bioactivities of all compounds were inactive in our bioassays.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"65 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78105369","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}
S. Paloi, N. Suwannarach, J. Kumla, Wiphawanee Phonrob, S. Karunarathna, S. Lumyong
Members of the genus Tulostoma are commonly referred to as stalked puffballs that are known to be found in tropical and temperate regions. More than 155 species had been published worldwide, while 57 species had been reported in Asia. Herein, we present a brief review of the current findings through an overview of recently published literature involving taxonomic updates, diversity, distribution, and sequence data of Tulostoma in Asia. Moreover, two specimens of Tulostoma were collected during the period from 2021 to 2022 in northern Thailand. These two specimens were identified as T. exasperatum based on morphological characteristics. Till today, no sequence data of this species have been recorded. The present study offers the first record of T. exasperatum in Thailand along with the phylogenetic placement of this species within the genus Tulostoma. Comprehensive descriptions, photographic documentation, and comparisons with morphologically similar and phylogenetically related species are provided.
{"title":"An Update on Species Diversity, Distribution and Sequence Data of Tulostoma in Asia with the Addition of Tulostoma exasperatum, A New Record for Thailand","authors":"S. Paloi, N. Suwannarach, J. Kumla, Wiphawanee Phonrob, S. Karunarathna, S. Lumyong","doi":"10.12982/cmjs.2023.018","DOIUrl":"https://doi.org/10.12982/cmjs.2023.018","url":null,"abstract":"Members of the genus Tulostoma are commonly referred to as stalked puffballs that are known to be found in tropical and temperate regions. More than 155 species had been published worldwide, while 57 species had been reported in Asia. Herein, we present a brief review of the current findings through an overview of recently published literature involving taxonomic updates, diversity, distribution, and sequence data of Tulostoma in Asia. Moreover, two specimens of Tulostoma were collected during the period from 2021 to 2022 in northern Thailand. These two specimens were identified as T. exasperatum based on morphological characteristics. Till today, no sequence data of this species have been recorded. The present study offers the first record of T. exasperatum in Thailand along with the phylogenetic placement of this species within the genus Tulostoma. Comprehensive descriptions, photographic documentation, and comparisons with morphologically similar and phylogenetically related species are provided.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81968435","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}
P. Chanlert, Wiparat Manoma, Aneeta Jintara, Thanate Kerdkaew, T. Sutthibutpong
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.
{"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}
Kok Jun Liew, Xinhua Zhang, Xiaohong Cai, Dongdong Ren, Wei Liu, Z. Chang, Chun Shiong Chong
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.
C - old血浆是一种广泛应用于食品、农业和医疗行业的消毒技术。本研究利用冷等离子体对铜绿假单胞菌进行灭菌，并测定细胞存活率。RNA测序用于测定冷等离子体处理1分钟(T1)、3分钟(T3)和5分钟(T5)时细菌的反应。结果表明，治疗时间越长，细胞存活率越低。冷等离子体诱导铜绿假单胞菌快速细胞反应。基因本体富集分析结果表明，与T1和T3相比，T5的富集项最多。受影响最大的基因是那些参与抗氧化产生、转录调节、核糖体形成、转运蛋白、趋化性和细胞运动性的基因。P. aeruginosa对低温血浆的初始反应(T1)包括抗氧化基因的上调，随后转录调节因子、转运蛋白、趋化性和细胞运动的下调作为中间反应(T3)，最终反应(T5)包括核糖体形成的严重下调。以往对冷血浆转录组的研究主要集中在大肠杆菌和枯草芽孢杆菌等原核细胞上，而对铜绿假单胞菌的研究较少。本研究通过转录组分析证实了铜绿假单胞菌对冷血浆的序列反应。
{"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}
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