Journal of Science and Mathematics Letters最新文献

{"title":"Development and perception of students on e-Assessment Module for Chemistry Massive Open Online Course (MOOC)","authors":"N. Kamarudin, T. Lee, A. M. Sharif, H. Taha, Nurul Izza Binti Abdul Rahim","doi":"10.37134/JSML.VOL8.2.13.2020","DOIUrl":"https://doi.org/10.37134/JSML.VOL8.2.13.2020","url":null,"abstract":"The results of the needs analysis and previous studies indicate that the implementation of the Massive Open Online Course (MOOC) has not yet achieved the target set by the Ministry of Education Malaysia. Therefore, this study aimed to develop the e-assessment module for Chemistry MOOC and investigate the perception of 129 respondents among Bachelor of Chemistry Education students. This is a design and development research using ADDIE model. The instruments involved are the module content validity evaluation form, the module reliability questionnaire and the perception questionnaire. The results showed that the S-CVI/Ave value obtained for the 389 items in the evaluation of module content validity was 1.00. Furthermore, the Cronbach’s alpha value obtained for the module reliability was 0.97. The mean and standard deviation of students' perceptions of the e-assessment module were 3.44 and 0.58, respectively. In conclusion, validity index, Cronbach's alpha reliability coefficient and mean value for students' perceptions of the e-assessment module are good. The implication is that the use of this e-assessment module for Chemistry MOOC can help students conduct self-assessments online, strengthen their understanding of chemistry concepts while helping lecturers diversify their assessment methods.","PeriodicalId":171468,"journal":{"name":"Journal of Science and Mathematics Letters","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121957004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Perlakuan Metakognitif Pelajar Tingkatan Empat di Sekolah Hulu Selangor dalam Menyelesaikan Masalah Matematik","authors":"Farhana Aida Mohd Khalid, Nik Nur Ainaa Athirah Rozaimi, Hafsah Taha","doi":"10.37134/JSML.VOL8.2.10.2020","DOIUrl":"https://doi.org/10.37134/JSML.VOL8.2.10.2020","url":null,"abstract":"Kajian ini bertujuan mengenal pasti perlakuan metakognitif murid Tingkatan Empat dalam menyelesaikan masalah Matematik. Secara spesifiknya kajian ini mengenal pasti perbezaan tahap perlakuan metakognitif murid dalam menyelesaikan masalah Matematik berdasarkan jantina dan tahap pencapaian Matematik mereka. Kajian ini menggunakan pendekatan kuantitatif dengan reka bentuk kaedah tinjauan. Instrumen yang digunakan ialah borang soal selidik metakognitif yang merangkumi konstruk kesedaran, strategi kognitif, perancangan dan pengesanan kendiri serta menggunakan instrumen ujian. Dapatan menunjukkan tahap perlakuan metakognitif murid Tingkatan Empat dalam menyelesaikan masalah bagi konstruk kesedaran, strategi kognitif, perancangan dan pengesanan kendiri adalah tinggi. Hasil analisis ujian-t menunjukkan bahawa tidak terdapat perbezaan signifikan antara tahap perlakuan metakognitif murid berdasarkan jantina. Kajian juga menunjukkanidak terdapat perbezaan yang signifikan antara tahap perlakuan metakognitif murid dalam menyelesaikan masalah Matematik berdasarkan tahap pencapaian mata pelajaran tersebut.","PeriodicalId":171468,"journal":{"name":"Journal of Science and Mathematics Letters","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125685756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phytochemical and Physicochemical Studies of Fermented Liquid of Citrulus lanatus (Egusi) Pod as a Potential Herbicide","authors":"I. Owoicho, E. Stella, A. Fagbohun","doi":"10.37134/JSML.VOL8.2.9.2020","DOIUrl":"https://doi.org/10.37134/JSML.VOL8.2.9.2020","url":null,"abstract":"The fermented liquid of Citrulus lanatus (Egusi) pod was observed to have a herbicidal behavior after discarding it on grasses in the process of removing the seed from the pod which includes washing and filteration. Preliminary studies like phytochemical screening, physicochemical analysis (colour, pH, chloride, phosphate, phosphorus, total alkalinity, odour) and heavy metals (Zn and Cu) determination were carried out on the fermented Egusi pod liquid. The phytochemical screening showed that steroids, triterpenoids, saponins, terpenoids and triterpenes were present, while phenol, alkaloids, glycosides, anthracenes and flavonoids were absent. The physical analysis showed that the fermented liquid colour is creamy, turbid in appearance, a pH of 4.59, with an objectionable odour. The chemical analysis showed the absence of chloride, total alkalinity and total hardness. The total amount of phosphate and phosphorus present were 217.8 mg/L (4.35%) and 71.03 mg/L (1.42%) respectively, while the amount of Zn and Cu were 0.4426 mg/L and 4.4352 mg/L respectively. The herbicidal behavior could be attributed to its acidic nature and the high amount of phosphate.","PeriodicalId":171468,"journal":{"name":"Journal of Science and Mathematics Letters","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134320719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Indoor Particulate Matter (PM2.5) and Comfort Parameters in a University Building","authors":"N. B. A. Wahid, Intan Idura Mohamad Isa, Ahmad Hassan, Muhammad Izzat Iman Razali, Ahmad Haziq Hasrizal, M. Muzamil, Mohammad Soef Hazmie","doi":"10.37134/JSML.VOL8.2.8.2020","DOIUrl":"https://doi.org/10.37134/JSML.VOL8.2.8.2020","url":null,"abstract":"This study aims to determine the particulate matter (PM2.5) mass concentrations and the comfort parameters (total bacterial counts (TBC), total fungal counts (TFC), relative humidity and temperature) in a university building. The samplings were carried out in three different indoor areas, including lecture hall, laboratory and lecturer office. PM2.5 samples were collected over a period of 8 h sampling using a low volume sampler (LVS). The anemometer Model Kestrel 0855YEL was used to measure relative humidity and temperature parameters. The sampling of airborne microorganisms was conducted by using microbial sampler at 350 L air sampled volume. The results showed that the highest average of PM2.5 was at lecture hall (88.54 ± 26.21 µgm-3) followed by lecturer office (69.79 ± 19.06 µgm-3) and laboratory (47.92 ± 24.88 µgm-3). The mean of TBC and TFC readings recorded as follow; 32.71 ± 5.91 cfu m-3 and 76.71 ± 21.5 cfu m-3 for laboratory, 112.1 ± 29.06 cfu m-3 and 124.67 ± 23.35 cfu m-3 for lecturer office, 121.74 ± 19.33 cfu m-3 and 115.33 ± 8.08 cfu m-3 for lecture hall. The average of all comfort parameter was within the prescribed standard by Industry Code of Practice on Indoor Air Quality 2010 for all sampling sites. Therefore, all occupants of the building can work in a conducive and comfortable environment. This study is in line with the objectives of National Policy on the Environment (DASN), which focusing on achieving a clean, safe, healthy and productive environment for present and future generations.","PeriodicalId":171468,"journal":{"name":"Journal of Science and Mathematics Letters","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122916737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isolation and Cloning of Tropomyosin and Arginine Kinase from Tiger Prawn Penaeus monodon and Blue Swimming Crab Portunus trituberculatus","authors":"Z. H. M. Yadzir, B. Leecyous, A. S. Zamri","doi":"10.37134/JSML.VOL8.2.5.2020","DOIUrl":"https://doi.org/10.37134/JSML.VOL8.2.5.2020","url":null,"abstract":"Shellfish is an important source of food and plays a significant role in human nutrition and health. However, shellfish allergy is a long-lasting disorder which mostly persists throughout life and is often associated with severe reactions [1]. Among the various consumed shellfish, prawns and crabs are the most widely consumed and can lead to the most severe reactions. At present, allergies to shellfish are diagnosed similarly to other food allergies. The diagnosis relies upon careful evaluation of history, the presence of appropriate clinical signs and confirmation with in vivo or in vitro tests to demonstrate the presence of allergen-specific immunoglobulin E (IgE) [2]. However, both in vivo or in vitro diagnostic approaches are mainly based on the use of crude allergen extracts. Crude allergen extracts are obtained from biological sources and consist of mixture of allergenic components with high amounts of undesirable products that can interfere with diagnosis. In many cases, only few of the several proteins found in crude allergen extracts act as the essential allergens in the majority of patients that are allergic to the substance. The most important ones are called major allergens. Problems associated with using crude allergen extracts for allergy diagnosis may be overcome with recombinant allergens. Recombinant allergens with high purity can be produced by using controlled production procedures that yield defined molecules with known molecular, immunologic and biological characteristics [1]. Tiger prawn Penaeus monodon and blue swimming crab Portunus trituberculatus, are among the widely consumed shellfish in Malaysia. Our earlier study involving 131 atopic patients in Allergy Clinic, Kuala Lumpur Hospital demonstrated that patients in Malaysia suffering from allergic responses to shellfish including tiger prawn Penaeus monodon and blue swimming crab Portunus trituberculatus. Amongst the shellfish extracts tested, prawn elicited the highest frequency of positive reactivity in 39% of the patients. Further, crab was the second most common shellfish to elicit a positive reaction in 24% of the patients [3]. Our first phase study has successfully identified tropomyosin and arginine kinase as the major allergens in both species of shellfish. However, more information about the individual allergenic species-specific components is needed. Therefore, we continued our study to isolate and clone the tropomyosin and arginine kinase from these two species of shellfish, tiger prawn Penaeus monodon and blue swimming crab Portunus trituberculatus. Tropomyosin and arginine kinase were isolated from the total RNA (Ribonucleic Acid) obtained from both prawn and crab muscles followed by RT-PCR (Reverse Transcriptase-Polymerase Chain Reaction). The RT-PCR products were then cloned into the cloning vector, pJET 1.2 and transformed into Escherichia coli host. Transformants were screened for positive clones by PCR (Polymerase Chain Reaction) colony and sequenced. ","PeriodicalId":171468,"journal":{"name":"Journal of Science and Mathematics Letters","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123367260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compositional analysis and characterization of lignocellulosic biomass from selected agricultural wastes","authors":"A. Fadeyi, S. Akiode, S. Emmanuel, O. Falayi","doi":"10.37134/JSML.VOL8.1.6.2020","DOIUrl":"https://doi.org/10.37134/JSML.VOL8.1.6.2020","url":null,"abstract":"Agricultural wastes have been identified as a potential lignocellulosic biomass for bioethanol production. An accurate biomass characterization is needed to evaluate the new potential lignocelluloses biosource for biofuel production. This study evaluates the compositional analysis and characterization of three agricultural wastes (melon husk, moringa pod and mango endocarp). The samples were collected locally in Sheda Village, FCT, Abuja, Nigeria. The lignocellulose biomass composition of the samples was determined by using a proven economically viable gravimetric method and the samples were further characterized using the FTIR. The results showed that a significant amount of hemicelluloses content was found, from 19.38% to 27.74% and the highest amount was present in melon musk. The amount of cellulose ranging from 22.49% to 45.84% was found where the highest amount was found in mango endocarp. Lignin content was in the range of 22.62% to 29.87% and melon husk was shown to have the highest amount. The FTIR spectroscopic analysis showed a broad band at 3422.99 cm-1, 3422.66 cm-1, 3422.85 cm-1 (for mango endocarp, melon husk and moringa pod respectively) representing bonded –OH groups. The peak around 1637 cm-1 corresponds to C=C stretching of conjugated carboxylic acids. The aliphatic chains, -CH2- and –CH3, which form the basic structure of cellulose material, were seen at 1205.72, 1204.50 and 1206.24 cm-1. The signals at 1056.15, 1035.80 and 1055.86 cm-1 correspond to C-O-R (alcohols or esters) vibration. The results show that the samples contain significant quantity of lignocellulosic biomass. Thus, the agricultural wastes could be of valuable use in biofuel production.","PeriodicalId":171468,"journal":{"name":"Journal of Science and Mathematics Letters","volume":"206 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123061796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analisis Simetri Reka Bentuk Kesenian Melayu Dalam Perspektif Etnomatematik","authors":"Rushana Sulaiman, Halim Husain","doi":"10.37134/JSML.VOL7.8.2019","DOIUrl":"https://doi.org/10.37134/JSML.VOL7.8.2019","url":null,"abstract":"Kertas kerja ini adalah untuk meneliti secara ilmiah makna yang dirujuk kepada konsep kesenian Melayu melalui aspek dan pemikiran etnomatematik. Ianya boleh dilihat menerusi seni ukiran, seni anyaman, seni lukis, seni bina dan seni tekstil. Corak dan motif dalam hasil kesenian Melayu kaya dengan nilai dan amalan matematik yang boleh dilihat melalui reka bentuk geometri. Kajian ini merupakan kajian analisis simetri yang menerapkan kaedah kualitatif. Reka bentuk kesenian dianalisis dalam konteks formalistik bagi menghuraikan konsep simetri yang wujud dalam pendekatan etnomatematik. Pengumpulan data bertulis dan visual dibuat melalui kaedah dokumentasi, visual rakaman, dan pemerhatian bagi mendapatkan maklumat. Dapatan kajian mendapati hubung kait antara seni dan matematik tidak dapat disangkal lagi kerana melalui keindahan hasil kerja kesenian juga mempunyai keindahannya dari aspek matematik. Implikasi daripada penyelidikan ini bertujuan melihat kesenian bukan sahaja daripada sudut apresiasi seni, malahan boleh diperluaskan kepada pelbagai perspektif falsafah ilmu, khususnya dalam aspek matematik","PeriodicalId":171468,"journal":{"name":"Journal of Science and Mathematics Letters","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130851690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Production of Artificial Seeds of Carica papaya L. var Eksotika","authors":"Nurul Shifa Radzuan, N. Hasbullah, Fadhlul Khaliq Ab Patah, H. Idris, Mohammad Mohd Lassim","doi":"10.37134/JSML.VOL7.7.2019","DOIUrl":"https://doi.org/10.37134/JSML.VOL7.7.2019","url":null,"abstract":"Artificial seed production technique for Carica papaya L. var Eksotika is considered as a valuable alternate technology of propagation. Limited availability of the elite genotypes apprehends the utility of the C. papaya L. var Eksotika plants, for industrial use and ecological improvement. Therefore, development of an efficient method for C. papaya L. var Eksotika artificial seeds production by encapsulation of micro shoots in sodium alginate matrix were produced. Artificial seeds of C. papaya L. var Eksotika were produced by encapsulated micro shoots of C. papaya L. varieties Eksotika propagated in vitro. The production of artificial plant seeds of this species offered ideal beads based upon stiffness, texture, size and shape of beads. It was found that 4% sodium alginate and harden in two hundred millimolar CaCl2.2H2O solution produced optimum beads with stiff, clear, round and homogeneous size for 30 minutes among the concentrations tested.","PeriodicalId":171468,"journal":{"name":"Journal of Science and Mathematics Letters","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114557381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sistem Angka Perpuluhan yang Diketahui Tertua di Dunia: Angka Malayonesia","authors":"Shaharir Mohamad Zain, Zahrin Affandi Mohd Zahrin","doi":"10.37134/JSML.VOL7.6.2019","DOIUrl":"https://doi.org/10.37134/JSML.VOL7.6.2019","url":null,"abstract":"Tamadun Malayonesia yang sarjananya menggunakan bahasa Melayu sebagai pengungkap kecendekiawanannya, masih belum diiktiraf kewujudannya oleh sarjana Barat kerana ketiadaan bukti bertulis pencapaiannya yang tinggi dalam KeJuTSAMA/STEM.  Dalam usaha memperbaiki keadaan inilah maka kami telah melakukan penyelidikan, ekskavasi ilmu, sejak 1990-an bagi memperoleh unsur-unsur sains dan matematik (SAMA) dalam bahasa Melayu yang asli dan terkehadapan daripada bangsa lain sezamannya terutamanya Inggeris. Di sini dipaparkan beberapa hasil penyelidikan yang mutakhir tentang perkara tersebut, khususnya untuk bidang angka.  Ditunjukkan bahawa bangsa Malayonesia berbahasa Melayu adalah pencipta terawal di dunia sistem angka perpuluhan seperti sekarang ini, sekaligus menjadikan bangsa pencipta angka kosong yang tertua di dunia. Hal ini bertentangan dengan kepercayaan dunia selama ini bahawa sistem angka perpuluhan dengan kosong adalah ciptaan tamadun Hindu, Islam atau Khmer Lama. \u0000The existence of the Malayonesian civilization in which her scholars used Malay as the their intellectual expresions, has not yet been recognised by Western sholars because of lack of written proof in her achievement in STEM. In an effort to improve the situation, we have done some knowledge excavation since 1990s in order to obtain original elements of science in Malay  language which were ahead of their counterpart in different countries in Europe especially UK at the same period of time. The latest results are presented here, particularly in the fields of numerals. It is shown that the Malayonesian numeral decimal system with her own zero symbol is the oldest in the world. This contradicts the present belief that the decimal numeral system was invented by the Hindu, the Islamic or the Old Khmer civilisation.","PeriodicalId":171468,"journal":{"name":"Journal of Science and Mathematics Letters","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127862153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Antibacterial Activity of Phytochemicals from Garcinia parvifolia Miq. and Garcinia hombroniana Pierre","authors":"N. Muhammad, N. Basar, Shajarahtunnur Jamil","doi":"10.37134/JSML.VOL7.5.2019","DOIUrl":"https://doi.org/10.37134/JSML.VOL7.5.2019","url":null,"abstract":"Phytochemical studies on the stem bark of Garcinia parvifolia and pericarp of Garcinia hombroniana have been investigated. The crude extracts were purified using chromatographic techniques to obtain pure compounds named as rubraxanthone (1), parvixanthone G (2) cowanin (3), garcihombronane B (4), garcihombronane C (5) and stigmasterol (6). The structures of all compounds were characterized by spectroscopic methods. The extracts and phytochemicals were tested for their antibacterial activity using disc diffusion method, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC). Acetone extract of the pericarp of G. hombroniana showed the most significant antibacterial activity with MIC and MBC values of 225 µg/mL, meanwhile, compound (3) exhibited the most significant antibacterial activity compared to other xanthones with MBC value of 225 µg/mL. \u0000Clusiaceae; Garcinia parvifolia; Garcinia hombroniana; antibacterial","PeriodicalId":171468,"journal":{"name":"Journal of Science and Mathematics Letters","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120995565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}