Pub Date : 2023-08-31DOI: 10.17576/jsm-2023-5208-03
Natasha Nizam, Sumithra Mohanasunthar, Alyza A. Azmi, Sabiqah Tuan Anuar, Yusof Shuaib Ibrahim, Wan Mohd Afiq Wan Mohd Khalik
This research article presents a study on the potential use of oil-based ferrofluid for the efficient removal of microplastics from water. The targeted analyte, micro-polystyrene (micro-PS), was chosen along with palm oil as the carrier liquid. Fourier Transform Infrared (FTIR) analysis was conducted to identify the main peaks in the ferrofluid, including carboxyl group (1542 cm-1), C-H bonding (1022 cm-1), CH2 bonding (2941 cm-1), CH3 bonding (3461 cm-1), C=C bonding (1255 cm-1), and Fe-O (597.34 cm-1). A comprehensive investigation of the synergistic effect of six variables was performed: volume of oil (4-15 mL), weight of magnetite nanoparticles (0.1-0.2 g), stirring rate (132-468 rpm), contact time (3-12 min), pH value of water samples (pH 6-8), and effect on ionic strength (0-16 g/L). Response surface methodology, including 26-Plackett-Burman and 24-central composite design, were employed to establish the relationship between the variables. The optimum operational settings proposed by the model were as follows: volume of oil (14.6 mL), weight of magnetite nanoparticles (0.1 g), stirring rate (216 rpm), contact time (3.29 min), pH value of water samples (pH 6-6.5), and effect on ionic strength (16 g/L), resulting in a remarkable removal efficiency of 91.09 ± 0.99%. The method exhibited desirable figures of merit, including a low bias (%RSD) of below 5% and the ability to reuse the ferrofluids for up to five cycles. Additionally, an analytical greenness metric was employed to assess the environmental impact of the sample preparation process, with a green score of 0.69/1.0 (indicating a light green colour). Future work in this field could focus on the scalability of the developed method and its applicability to real-wastewater treatment.
{"title":"Removal Efficiency for Micro-Polystyrene in Water by the Oil-Based Ferrofluid Employ Response Surface Methodology","authors":"Natasha Nizam, Sumithra Mohanasunthar, Alyza A. Azmi, Sabiqah Tuan Anuar, Yusof Shuaib Ibrahim, Wan Mohd Afiq Wan Mohd Khalik","doi":"10.17576/jsm-2023-5208-03","DOIUrl":"https://doi.org/10.17576/jsm-2023-5208-03","url":null,"abstract":"This research article presents a study on the potential use of oil-based ferrofluid for the efficient removal of microplastics from water. The targeted analyte, micro-polystyrene (micro-PS), was chosen along with palm oil as the carrier liquid. Fourier Transform Infrared (FTIR) analysis was conducted to identify the main peaks in the ferrofluid, including carboxyl group (1542 cm-1), C-H bonding (1022 cm-1), CH2 bonding (2941 cm-1), CH3 bonding (3461 cm-1), C=C bonding (1255 cm-1), and Fe-O (597.34 cm-1). A comprehensive investigation of the synergistic effect of six variables was performed: volume of oil (4-15 mL), weight of magnetite nanoparticles (0.1-0.2 g), stirring rate (132-468 rpm), contact time (3-12 min), pH value of water samples (pH 6-8), and effect on ionic strength (0-16 g/L). Response surface methodology, including 26-Plackett-Burman and 24-central composite design, were employed to establish the relationship between the variables. The optimum operational settings proposed by the model were as follows: volume of oil (14.6 mL), weight of magnetite nanoparticles (0.1 g), stirring rate (216 rpm), contact time (3.29 min), pH value of water samples (pH 6-6.5), and effect on ionic strength (16 g/L), resulting in a remarkable removal efficiency of 91.09 ± 0.99%. The method exhibited desirable figures of merit, including a low bias (%RSD) of below 5% and the ability to reuse the ferrofluids for up to five cycles. Additionally, an analytical greenness metric was employed to assess the environmental impact of the sample preparation process, with a green score of 0.69/1.0 (indicating a light green colour). Future work in this field could focus on the scalability of the developed method and its applicability to real-wastewater treatment.","PeriodicalId":21366,"journal":{"name":"Sains Malaysiana","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136036192","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}
Okra is known for its neuroprotective and antioxidant properties. We aimed to investigate the potential effects of okra seed powder in alleviating high far diet (HFD) induced cognitive deficit and hypercholesterolemia. We randomly allocated thirty-six C57BL/6J male mice into: (i) control, mice fed with a normal fat level diet; (ii) HFD, mice fed with HFD; (iii) HFD-OS1; (iv) HFD-OS2; (v) HFD-OS3, mice fed with HFD and okra seed powder (200, 400, or 800 mg/kg/day, respectively); (vi) HFD-SIM, mice fed with HFD and simvastatin (20 mg/kg/day). After 10 weeks of treatment period, the mice were tested with an episodic-like memory test (EMT) and Morris water maze (MWM). We found significantly higher total and LDL cholesterol levels in mice fed with HFD. Compared to the HFD group, the control group performed better in the EMT test, and also learned and retrieved spatial reference memory better in the MWM test. The okra seed powder significantly improved spatial learning in four days of acquisition trials and the highest dose of okra profoundly improved spatial reference memory retention during the probe trial. Contrary to the MWM results, the okra-treated animals did not perform significantly better than the HFD-treated animals in EMT. At present, we recommend future studies testing the potential neuroprotective or cognitive enhancing effects of okra to assess different cognitive domains using various disease models to have a better understanding on the potential neuroprotective properties of okra.
{"title":"The Effects of Abelmoschus esculentus (L.) Moench Seed on High Fat Diet Induced Metabolic and Cognitive Impairments in C57BL/6J Mice","authors":"Paweena Wongwitwichot, Supattra Prom-in, Jasadee Kaewsrichan, Nuntika Wangpradit, Kien Hui Chua, Mohamad Fairuz Yahaya, Azizah Ugusman, Jaya Kumar","doi":"10.17576/jsm-2023-5208-10","DOIUrl":"https://doi.org/10.17576/jsm-2023-5208-10","url":null,"abstract":"Okra is known for its neuroprotective and antioxidant properties. We aimed to investigate the potential effects of okra seed powder in alleviating high far diet (HFD) induced cognitive deficit and hypercholesterolemia. We randomly allocated thirty-six C57BL/6J male mice into: (i) control, mice fed with a normal fat level diet; (ii) HFD, mice fed with HFD; (iii) HFD-OS1; (iv) HFD-OS2; (v) HFD-OS3, mice fed with HFD and okra seed powder (200, 400, or 800 mg/kg/day, respectively); (vi) HFD-SIM, mice fed with HFD and simvastatin (20 mg/kg/day). After 10 weeks of treatment period, the mice were tested with an episodic-like memory test (EMT) and Morris water maze (MWM). We found significantly higher total and LDL cholesterol levels in mice fed with HFD. Compared to the HFD group, the control group performed better in the EMT test, and also learned and retrieved spatial reference memory better in the MWM test. The okra seed powder significantly improved spatial learning in four days of acquisition trials and the highest dose of okra profoundly improved spatial reference memory retention during the probe trial. Contrary to the MWM results, the okra-treated animals did not perform significantly better than the HFD-treated animals in EMT. At present, we recommend future studies testing the potential neuroprotective or cognitive enhancing effects of okra to assess different cognitive domains using various disease models to have a better understanding on the potential neuroprotective properties of okra.","PeriodicalId":21366,"journal":{"name":"Sains Malaysiana","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136036449","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}
Pub Date : 2023-08-31DOI: 10.17576/jsm-2023-5208-13
Nur Inshirah Naqiah Ismail, Zanariah Abdul Majid
The neutral Volterra integro-differential equation with proportional and mixed delays (NDVIDE) is being solved by a newly proposed technique in numerical method, namely, the two-point one off-point block multistep method (1OBM3). The method is also known as a hybrid multistep block method. Subsequently, Lagrange interpolating polynomial is utilized in order to develop the hybrid block method. The foundation of the technique is taken from predictor and corrector formulae. The proposed method will solve NDVIDE in two steps simultaneously, with three predictor formulae including one off-point. The NDVIDE problems are solved via the constant step size technique. In order to solve the integral and differential parts of the problems, two alternative numerical approaches are applied. The differentiation part is approximated by deriving the divided difference formula, while the integration part is interpolated using composite Simpson’s rule. Note that the proposed method has been analysed thoroughly regarding its order, consistency, zero stability and convergence of the method. The stability region for 1OBM3 has been constructed based on the stability polynomial obtained. Consequently, numerical results are presented to demonstrate the effectiveness of the proposed method, 1OBM3.
{"title":"Hybrid Multistep Block Method for Solving Neutral Volterra Integro-Differential Equation with Proportional and Mixed Delays","authors":"Nur Inshirah Naqiah Ismail, Zanariah Abdul Majid","doi":"10.17576/jsm-2023-5208-13","DOIUrl":"https://doi.org/10.17576/jsm-2023-5208-13","url":null,"abstract":"The neutral Volterra integro-differential equation with proportional and mixed delays (NDVIDE) is being solved by a newly proposed technique in numerical method, namely, the two-point one off-point block multistep method (1OBM3). The method is also known as a hybrid multistep block method. Subsequently, Lagrange interpolating polynomial is utilized in order to develop the hybrid block method. The foundation of the technique is taken from predictor and corrector formulae. The proposed method will solve NDVIDE in two steps simultaneously, with three predictor formulae including one off-point. The NDVIDE problems are solved via the constant step size technique. In order to solve the integral and differential parts of the problems, two alternative numerical approaches are applied. The differentiation part is approximated by deriving the divided difference formula, while the integration part is interpolated using composite Simpson’s rule. Note that the proposed method has been analysed thoroughly regarding its order, consistency, zero stability and convergence of the method. The stability region for 1OBM3 has been constructed based on the stability polynomial obtained. Consequently, numerical results are presented to demonstrate the effectiveness of the proposed method, 1OBM3.","PeriodicalId":21366,"journal":{"name":"Sains Malaysiana","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136036596","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}
Pub Date : 2023-08-31DOI: 10.17576/jsm-2023-5208-12
Syahidah Nabila Rosli, Norinsan Kamil Othman, Ahmad Rifqi Md Zain
Perencatan kakisan berasaskan bahan pengekstrakan tumbuhan telah mendapat perhatian penyelidik sejak beberapa tahun kebelakangan ini disebabkan tidak bertoksik dan biodegredasi. Hasil ekstrak Etlingera elatior telah digunAakan dalam kajian ini sebagai perencat kakisan hijau dalam medium 0.5 M asid hidroklorik (HCl). Dalam kajian ini, bahan ekstrak yang diperoleh telah dicirikan menggunakan analisis spektroskopi inframerah Fourier-transformasi (FTIR) dan spektroskopi jisim-kromatografi gas (GC-MS) untuk mengenal pasti kumpulan berfungsi dan sebatian kimia yang wujud. Keberkesanan bahan ekstrak dalam perencatan kakisan keluli berkarbon rendah telah dikaji melalui ujian kehilangan berat dan ujian impedans (EIS) dalam medium berasid mengikut parameter suhu (25 °C, 45 °C dan 65 °C) dan kepekatan ekstrak (250 ppm, 450 ppm, 650 ppm, 950 ppm dan 1050 ppm) yang berbeza. Spesimen keluli berkarbon rendah dicirikan melalui mikroskop elektron imbasan (SEM) dan serakan x penyebaran tenaga (EDX). Spektroskopi inframerah Fourier-transformasi (FTIR) telah menunjukkan kehadiran kumpulan berfungsi seperti hidroksil dan alkena. Sebatian organik yang mempunyai ikatan π dengan kepadatan elektron tinggi akan memudahkan proses penjerapan. Analisis GC-MS pula mendedahkan empat sebatian utama yang terdapat dalam ekstrak Etlingera elatior iaitu N-asid hexadekanoik, siklododekan, 9,12-asid oktadekadienoik dan asid dodekanoik. Kecekapan perencatan yang diperoleh dari ujian kehilangan berat mendapati bahawa peratusan kecekapan perencatan tertinggi adalah 93.6%, manakala bagi ujian impedans (EIS) adalah 90.5% pada kepekatan 950 ppm. Suhu yang tinggi juga mempercepatkan kadar kakisan dan kecekapan perencatan (IE%) menurun. Morfologi pembentukan lapisan pelindung dilihat pada permukaan berkarbon rendah apabila dengan kehadiran perencat kakisan ekstrak Etlingera elatior. Secara keseluruhannya, perencat kakisan daripada ekstrak Etlingera elatior berupaya menghalang kakisan berlaku disokong pula dengan sifat yang mesra alam.
{"title":"Kajian Terhadap Eis dan Kaedah Kehilangan Berat: Novel Perencat Kakisan Hijau daripada Ekstrak Etlingera Elatior","authors":"Syahidah Nabila Rosli, Norinsan Kamil Othman, Ahmad Rifqi Md Zain","doi":"10.17576/jsm-2023-5208-12","DOIUrl":"https://doi.org/10.17576/jsm-2023-5208-12","url":null,"abstract":"Perencatan kakisan berasaskan bahan pengekstrakan tumbuhan telah mendapat perhatian penyelidik sejak beberapa tahun kebelakangan ini disebabkan tidak bertoksik dan biodegredasi. Hasil ekstrak Etlingera elatior telah digunAakan dalam kajian ini sebagai perencat kakisan hijau dalam medium 0.5 M asid hidroklorik (HCl). Dalam kajian ini, bahan ekstrak yang diperoleh telah dicirikan menggunakan analisis spektroskopi inframerah Fourier-transformasi (FTIR) dan spektroskopi jisim-kromatografi gas (GC-MS) untuk mengenal pasti kumpulan berfungsi dan sebatian kimia yang wujud. Keberkesanan bahan ekstrak dalam perencatan kakisan keluli berkarbon rendah telah dikaji melalui ujian kehilangan berat dan ujian impedans (EIS) dalam medium berasid mengikut parameter suhu (25 °C, 45 °C dan 65 °C) dan kepekatan ekstrak (250 ppm, 450 ppm, 650 ppm, 950 ppm dan 1050 ppm) yang berbeza. Spesimen keluli berkarbon rendah dicirikan melalui mikroskop elektron imbasan (SEM) dan serakan x penyebaran tenaga (EDX). Spektroskopi inframerah Fourier-transformasi (FTIR) telah menunjukkan kehadiran kumpulan berfungsi seperti hidroksil dan alkena. Sebatian organik yang mempunyai ikatan π dengan kepadatan elektron tinggi akan memudahkan proses penjerapan. Analisis GC-MS pula mendedahkan empat sebatian utama yang terdapat dalam ekstrak Etlingera elatior iaitu N-asid hexadekanoik, siklododekan, 9,12-asid oktadekadienoik dan asid dodekanoik. Kecekapan perencatan yang diperoleh dari ujian kehilangan berat mendapati bahawa peratusan kecekapan perencatan tertinggi adalah 93.6%, manakala bagi ujian impedans (EIS) adalah 90.5% pada kepekatan 950 ppm. Suhu yang tinggi juga mempercepatkan kadar kakisan dan kecekapan perencatan (IE%) menurun. Morfologi pembentukan lapisan pelindung dilihat pada permukaan berkarbon rendah apabila dengan kehadiran perencat kakisan ekstrak Etlingera elatior. Secara keseluruhannya, perencat kakisan daripada ekstrak Etlingera elatior berupaya menghalang kakisan berlaku disokong pula dengan sifat yang mesra alam.","PeriodicalId":21366,"journal":{"name":"Sains Malaysiana","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136036597","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}
Pub Date : 2023-07-31DOI: 10.17576/jsm-2023-5207-05
C.P. Teoh, P. Lavin, M. González-Aravena, C.M.V.L. Wong
A novel strain of Cryobacterium designated as SO2, was isolated from the Antarctic. Hence, this study was undertaken to gain further insight into the antimicrobial compounds and secondary metabolites produced by Cryobacterium sp. SO2. It was found that strain SO2 is a Gram-positive that exhibits an irregular rod shape, which formed yellow to orange pigmented colonies on semi-solid media. Strain SO2 grows at temperatures ranging from 4 to 25 ºC. It has a complete genomic size of 4.097 Mb. SO2 has a DNA G+C content of 68.43%, and genomic annotation showed that the genome contained 3,862 CDS, 10 rRNA, 55 tRNA and 1 tm-RNA. Phylogenetic and OrthoANI analysis suggested Cryobacterium sp. strains SO1, N22, TMB1-8, LW097, TMN39-1, C. zongtaiiTMN-42, C. arcticumPAMC27867 and C. soli GCJ02 as its closest phylogenetic neighbour. Genome annotation shows that strain SO2 confers β-lactamase class A, cephalosporin-C deacetylases, and 27 drug-resistance encoding genes, and allows resistance to ceftazidime. Functional annotation identifies 28.74% of predicted genes are of unknown functions. Genome mining indicates that there are six putative secondary metabolite gene clusters in strain SO2. They are made up of RRE-containing, terpene, beta-lactone, T3PKS, NAPAA, and 2dos. This finding shows strain SO2 harbours genes that may be involved in the production of compounds with antibacterial and antioxidant activities.
{"title":"Genomic Analysis of a Novel Antarctic Bacterium, Cyrobacterium sp.SO2 Provides Insights into its Genomic Potential for Production of Antimicrobial Compounds","authors":"C.P. Teoh, P. Lavin, M. González-Aravena, C.M.V.L. Wong","doi":"10.17576/jsm-2023-5207-05","DOIUrl":"https://doi.org/10.17576/jsm-2023-5207-05","url":null,"abstract":"A novel strain of Cryobacterium designated as SO2, was isolated from the Antarctic. Hence, this study was undertaken to gain further insight into the antimicrobial compounds and secondary metabolites produced by Cryobacterium sp. SO2. It was found that strain SO2 is a Gram-positive that exhibits an irregular rod shape, which formed yellow to orange pigmented colonies on semi-solid media. Strain SO2 grows at temperatures ranging from 4 to 25 ºC. It has a complete genomic size of 4.097 Mb. SO2 has a DNA G+C content of 68.43%, and genomic annotation showed that the genome contained 3,862 CDS, 10 rRNA, 55 tRNA and 1 tm-RNA. Phylogenetic and OrthoANI analysis suggested Cryobacterium sp. strains SO1, N22, TMB1-8, LW097, TMN39-1, C. zongtaiiTMN-42, C. arcticumPAMC27867 and C. soli GCJ02 as its closest phylogenetic neighbour. Genome annotation shows that strain SO2 confers β-lactamase class A, cephalosporin-C deacetylases, and 27 drug-resistance encoding genes, and allows resistance to ceftazidime. Functional annotation identifies 28.74% of predicted genes are of unknown functions. Genome mining indicates that there are six putative secondary metabolite gene clusters in strain SO2. They are made up of RRE-containing, terpene, beta-lactone, T3PKS, NAPAA, and 2dos. This finding shows strain SO2 harbours genes that may be involved in the production of compounds with antibacterial and antioxidant activities.","PeriodicalId":21366,"journal":{"name":"Sains Malaysiana","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135313451","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}
Pub Date : 2023-07-31DOI: 10.17576/jsm-2023-5207-06
Siti Nur Anisah Siti Nur Anisah, Diah Ratnadewi, Ence Darmo Jaya Supena
Lilies are increasingly demanded in Indonesia. However, the production of lily seedlings in Indonesia still needs to be improved, causing a strong dependence on imported bulbs as the planting material and low competitiveness in foreign flower markets. Insufficient lily production is due to the decreasing quality of the bulb as the planting material and the time required for vernalization to break the bulb dormancy. The study aimed to accelerate the time of bulb dormancy breaking and maintain the size of the lily bulb to get an efficient flower production with good quality. The research was conducted in a greenhouse during the rainy and dry seasons. Various exogenous gibberellic acid (GA3) concentrations with different soaking times were applied to lily bulbs to shorten the dormancy period. The most efficient treatment was soaking the bulbs in 100 mg/L of GA3 for 16 hours, from 19-20 weeks to 12-13 weeks. Further, paclobutrazol (PBZ) was sprayed on the plants to decelerate vegetative growth and grow bulb size. The results showed that GA3 could partly substitute vernalization to break bulb dormancy, and PBZ maintained the bulb size after plant harvesting. Additionally, the plant height was suppressed, and the stem diameter, leaf chlorophyll, and bulb carbohydrate content were significantly increased under 300 mg/L PBZ treatment, resulting in the bulbs' bigger size.
{"title":"Exogenous Gibberellic Acid Stimulates Bulb Dormancy Breaking and the Role of Paclobutrazol in Maintaining the Size of Harvested Bulb of Lily (Lilium sp.) cv. Tisento","authors":"Siti Nur Anisah Siti Nur Anisah, Diah Ratnadewi, Ence Darmo Jaya Supena","doi":"10.17576/jsm-2023-5207-06","DOIUrl":"https://doi.org/10.17576/jsm-2023-5207-06","url":null,"abstract":"Lilies are increasingly demanded in Indonesia. However, the production of lily seedlings in Indonesia still needs to be improved, causing a strong dependence on imported bulbs as the planting material and low competitiveness in foreign flower markets. Insufficient lily production is due to the decreasing quality of the bulb as the planting material and the time required for vernalization to break the bulb dormancy. The study aimed to accelerate the time of bulb dormancy breaking and maintain the size of the lily bulb to get an efficient flower production with good quality. The research was conducted in a greenhouse during the rainy and dry seasons. Various exogenous gibberellic acid (GA3) concentrations with different soaking times were applied to lily bulbs to shorten the dormancy period. The most efficient treatment was soaking the bulbs in 100 mg/L of GA3 for 16 hours, from 19-20 weeks to 12-13 weeks. Further, paclobutrazol (PBZ) was sprayed on the plants to decelerate vegetative growth and grow bulb size. The results showed that GA3 could partly substitute vernalization to break bulb dormancy, and PBZ maintained the bulb size after plant harvesting. Additionally, the plant height was suppressed, and the stem diameter, leaf chlorophyll, and bulb carbohydrate content were significantly increased under 300 mg/L PBZ treatment, resulting in the bulbs' bigger size.","PeriodicalId":21366,"journal":{"name":"Sains Malaysiana","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135313454","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}
Pub Date : 2023-07-31DOI: 10.17576/jsm-2023-5207-17
Zulfahmi Ali Rahman, Hafis Nazarah, Wan Mohd Razi Idris, Tukimat Lihan
There is a considerable interest in making alternative bricks using wastes. Firing temperature has been significantly improved the mechanical qualities of bricks. The aim of this study was to investigate into the impact of firing temperature and rice husk ash content on the mechanical properties of drinking water sludge bricks (DWS). Two types of bricks were produced; bricks made of 100% DWS (DWS100) and bricks with 80% DWS and 20% RHA (DWS80). These samples were subjected to different thermal variations of 300 °C and 700 °C for three hours. The unfired brick samples were also prepared for reference. The volume changes of the DWS100 bricks increased as the firing temperature climbed up to 500 °C, before dropped at 700 °C. A similar behaviour was also exhibited by DWS80 bricks, however it shrunk at earlier temperature of 500 °C. At 500 °C and 700 °C, the density of bricks decreased dramatically, with DWS80 bricks consistently being lesser than DWS100 bricks. The water absorption of DWS80 brick began to decrease at 500 °C, a lower temperature than that of DWS100, as the firing temperature climbed. RHA-added bricks (DWS80) were anticipated to absorb more water than DWS100 bricks, but this did not occur. This presumably induced by the constriction of clay mineral structure rather than organic matter removal at high temperature per se. The compressive strength increased with the increase in temperature. It can be inferred that RHA can decrease the compressive strength of RHA-added bricks, despite the fact that a higher fire temperature significantly increased their strength.
{"title":"Mechanical Characteristics of Developed Brick from Drinking Water Sludge Under Different Firing Temperatures and Rice Husk Ash Contents","authors":"Zulfahmi Ali Rahman, Hafis Nazarah, Wan Mohd Razi Idris, Tukimat Lihan","doi":"10.17576/jsm-2023-5207-17","DOIUrl":"https://doi.org/10.17576/jsm-2023-5207-17","url":null,"abstract":"There is a considerable interest in making alternative bricks using wastes. Firing temperature has been significantly improved the mechanical qualities of bricks. The aim of this study was to investigate into the impact of firing temperature and rice husk ash content on the mechanical properties of drinking water sludge bricks (DWS). Two types of bricks were produced; bricks made of 100% DWS (DWS100) and bricks with 80% DWS and 20% RHA (DWS80). These samples were subjected to different thermal variations of 300 °C and 700 °C for three hours. The unfired brick samples were also prepared for reference. The volume changes of the DWS100 bricks increased as the firing temperature climbed up to 500 °C, before dropped at 700 °C. A similar behaviour was also exhibited by DWS80 bricks, however it shrunk at earlier temperature of 500 °C. At 500 °C and 700 °C, the density of bricks decreased dramatically, with DWS80 bricks consistently being lesser than DWS100 bricks. The water absorption of DWS80 brick began to decrease at 500 °C, a lower temperature than that of DWS100, as the firing temperature climbed. RHA-added bricks (DWS80) were anticipated to absorb more water than DWS100 bricks, but this did not occur. This presumably induced by the constriction of clay mineral structure rather than organic matter removal at high temperature per se. The compressive strength increased with the increase in temperature. It can be inferred that RHA can decrease the compressive strength of RHA-added bricks, despite the fact that a higher fire temperature significantly increased their strength.","PeriodicalId":21366,"journal":{"name":"Sains Malaysiana","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135313449","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}
Antibiotic resistance is one of the most alarming problems today. Therefore, composite membranes have been widely applied for the removal of antibiotics from water. PVA/Agarose/Maltodextrin films have been synthesized by casting with various component ratios. They were evaluated for characteristics through moisture, solubility, expansion, and BET results. The results showed that PVA/Agarose/Maltodextrin films exhibited the best viability in the aquatic environment through low solubility (68.88% ± 0.03), high swelling (431.77% ± 5.89) and pore volume (0.034969 cm³/g). The adsorption capacity of PVA/Agarose/Maltodextrin was tested for several antibiotics such as Ciprofloxacin, Tetracycline, Oxy-Tetracycline, and Chloramphenicol. The results showed that Ciprofloxacin was removed by the PVA/Agarose/Maltodextrin films better than other antibiotics. The highest antibiotic adsorption was obtained at 20 min, temperature of 30 °C, dosage of 2 g/L, pH 6, and antibiotic concentration of 40 mg/L. Ciprofloxacin adsorption was predicted through adsorption kinetic and isothermal models. The compatibility of the Pseudo First Order kinetic and Dubinin-Radushkevich isothermal has shown that adsorption takes place according to a physical adsorption mechanism with electrostatic interactions on the surface of the material. The maximum adsorption capacity recorded at 4.48 mg/g based on the Dubinin-Radushkevich isothermal.
{"title":"Adsorption of Ciprofloxacin Using Composite Film from PVA, Agarose and Maltodextrin","authors":"Bich Ngoc Hoang, Dieu Tran Huong, Thi Cam Quyen Ngo, Thi Nhu Dung Nguyen, Long Giang Bach","doi":"10.17576/jsm-2023-5207-11","DOIUrl":"https://doi.org/10.17576/jsm-2023-5207-11","url":null,"abstract":"Antibiotic resistance is one of the most alarming problems today. Therefore, composite membranes have been widely applied for the removal of antibiotics from water. PVA/Agarose/Maltodextrin films have been synthesized by casting with various component ratios. They were evaluated for characteristics through moisture, solubility, expansion, and BET results. The results showed that PVA/Agarose/Maltodextrin films exhibited the best viability in the aquatic environment through low solubility (68.88% ± 0.03), high swelling (431.77% ± 5.89) and pore volume (0.034969 cm³/g). The adsorption capacity of PVA/Agarose/Maltodextrin was tested for several antibiotics such as Ciprofloxacin, Tetracycline, Oxy-Tetracycline, and Chloramphenicol. The results showed that Ciprofloxacin was removed by the PVA/Agarose/Maltodextrin films better than other antibiotics. The highest antibiotic adsorption was obtained at 20 min, temperature of 30 °C, dosage of 2 g/L, pH 6, and antibiotic concentration of 40 mg/L. Ciprofloxacin adsorption was predicted through adsorption kinetic and isothermal models. The compatibility of the Pseudo First Order kinetic and Dubinin-Radushkevich isothermal has shown that adsorption takes place according to a physical adsorption mechanism with electrostatic interactions on the surface of the material. The maximum adsorption capacity recorded at 4.48 mg/g based on the Dubinin-Radushkevich isothermal.","PeriodicalId":21366,"journal":{"name":"Sains Malaysiana","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135313458","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}
Pub Date : 2023-07-31DOI: 10.17576/jsm-2023-5207-08
Tse Seng Chuah, Chee Nam Hiew, Nursyafiqah Izzati Norzaidi, Sunny Goh Eng Giap
Understanding temperature and moisture stress that influence sethoxydim-resistant (R) goosegrass (Eleusine indica) germination is crucial for effective weed control, but little research has been done on the impact of these environmental factors on germination of the R goosegrass biotype. This research aims to confirm sethoxydim resistance in goosegrass and to examine interaction effects of different temperatures and water potentials on germination of the R goosegrass biotype. Dose–response tests showed that the R goosegrass biotype exhibited high resistance level to sethoxydim with 17-fold. In laboratory bioassays, the R goosegrass biotype germinated by 88-100% at 35 °C with water potentials ranging from 0 to -0.80 MPa, but no seed germination occurred at 10 °C and 40 °C under all water potential treatments. With rising water potentials from 0 to -0.80 MPa, seed germination at 15 to 30 °C decreased markedly. The time it took to achieve 50% seed germination (T 50) increased drastically when decreasing temperature from 35 to 15 °C. The T50 at 20 to 30 °C also increased as the water potential increased from -0.20 to -0.80 MPa. At 35 °C, however, the water potential level had no impact on T 50, implying that the R goosegrass biotype seed is water stress tolerant at 35 °C. The base temperature and base water potentials estimated were 10.6 °C and -1.28 MPa, respectively. These findings can help in determining the optimal time to apply pre-emergent and early post-emergent controls when a large proportion of R goosegrass biotype have already germinated or emerged.
{"title":"Seed Germination Characteristics as Affected by Interaction of Moisture Stress and Temperature in Sethoxydim-Resistant Biotype of Goosegrass (Eleusine indica (L.) Gaertn.) from Malaysia","authors":"Tse Seng Chuah, Chee Nam Hiew, Nursyafiqah Izzati Norzaidi, Sunny Goh Eng Giap","doi":"10.17576/jsm-2023-5207-08","DOIUrl":"https://doi.org/10.17576/jsm-2023-5207-08","url":null,"abstract":"Understanding temperature and moisture stress that influence sethoxydim-resistant (R) goosegrass (Eleusine indica) germination is crucial for effective weed control, but little research has been done on the impact of these environmental factors on germination of the R goosegrass biotype. This research aims to confirm sethoxydim resistance in goosegrass and to examine interaction effects of different temperatures and water potentials on germination of the R goosegrass biotype. Dose–response tests showed that the R goosegrass biotype exhibited high resistance level to sethoxydim with 17-fold. In laboratory bioassays, the R goosegrass biotype germinated by 88-100% at 35 °C with water potentials ranging from 0 to -0.80 MPa, but no seed germination occurred at 10 °C and 40 °C under all water potential treatments. With rising water potentials from 0 to -0.80 MPa, seed germination at 15 to 30 °C decreased markedly. The time it took to achieve 50% seed germination (T 50) increased drastically when decreasing temperature from 35 to 15 °C. The T50 at 20 to 30 °C also increased as the water potential increased from -0.20 to -0.80 MPa. At 35 °C, however, the water potential level had no impact on T 50, implying that the R goosegrass biotype seed is water stress tolerant at 35 °C. The base temperature and base water potentials estimated were 10.6 °C and -1.28 MPa, respectively. These findings can help in determining the optimal time to apply pre-emergent and early post-emergent controls when a large proportion of R goosegrass biotype have already germinated or emerged.","PeriodicalId":21366,"journal":{"name":"Sains Malaysiana","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135313460","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}
Pub Date : 2023-07-31DOI: 10.17576/jsm-2023-5207-19
Nurisha Mohd Zulkefli, Adzhar Rambli, Mohamad Ismeth Khan Azhar Suhaimi, Ibrahim Mohamed, Raiha Shazween Redzuan
This study focuses on comparing the performance of the Robust Circular Distance (RCDU*) (simplified version) and A statistics in detecting a single outlier in the Wrapped Normal (WN) samples. Firstly, this study proposes a simplified version of RCDU statistic. Then, the paper generates the cut-off points for both statistics taken from WN samples via a simulation study. This study also evaluates the performance of both statistics using the proportion of a correct outlier detection. As a result, for a small sample size, the performance of RCDU* and A statistics do not have a huge difference. However, for a large sample size of n=250, A statistic performs slightly better than RCDU* statistic. As an illustration of a practical example, both statistics successfully detected one outlier present in the wind direction data at Kota Bharu station.
{"title":"A Comparison Between Two Discordancy Tests to Identify Outlier in Wrapped Normal (WN) Samples","authors":"Nurisha Mohd Zulkefli, Adzhar Rambli, Mohamad Ismeth Khan Azhar Suhaimi, Ibrahim Mohamed, Raiha Shazween Redzuan","doi":"10.17576/jsm-2023-5207-19","DOIUrl":"https://doi.org/10.17576/jsm-2023-5207-19","url":null,"abstract":"This study focuses on comparing the performance of the Robust Circular Distance (RCDU*) (simplified version) and A statistics in detecting a single outlier in the Wrapped Normal (WN) samples. Firstly, this study proposes a simplified version of RCDU statistic. Then, the paper generates the cut-off points for both statistics taken from WN samples via a simulation study. This study also evaluates the performance of both statistics using the proportion of a correct outlier detection. As a result, for a small sample size, the performance of RCDU* and A statistics do not have a huge difference. However, for a large sample size of n=250, A statistic performs slightly better than RCDU* statistic. As an illustration of a practical example, both statistics successfully detected one outlier present in the wind direction data at Kota Bharu station.","PeriodicalId":21366,"journal":{"name":"Sains Malaysiana","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135313462","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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