Pub Date : 2022-12-23DOI: 10.4038/josuk.v15i2.8067
B. Basnayake, N. Chandrasekara
{"title":"Forecasting exchange rates in Sri Lanka: a comparison of the double seasonal autoregressive integrated moving average models (DSARIMA) and SARIMA models","authors":"B. Basnayake, N. Chandrasekara","doi":"10.4038/josuk.v15i2.8067","DOIUrl":"https://doi.org/10.4038/josuk.v15i2.8067","url":null,"abstract":"","PeriodicalId":444777,"journal":{"name":"Journal of Science of the University of Kelaniya Sri Lanka","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134008544","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}
Pub Date : 2022-12-12DOI: 10.4038/josuk.v15i2.8062
N. Siyambalapitiya, R. Wickramarachchi
{"title":"An exploration of the psychological factors affecting on information technology employees in Sri Lanka due to the concept of work from home during covid-19 pandemic","authors":"N. Siyambalapitiya, R. Wickramarachchi","doi":"10.4038/josuk.v15i2.8062","DOIUrl":"https://doi.org/10.4038/josuk.v15i2.8062","url":null,"abstract":"","PeriodicalId":444777,"journal":{"name":"Journal of Science of the University of Kelaniya Sri Lanka","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122501413","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}
Pub Date : 2022-12-12DOI: 10.4038/josuk.v15i2.8073
V. Pathirana, R. D. De Silva
{"title":"Mapping of well water and soil parameters in a selected grama niladhari division of Gampaha district","authors":"V. Pathirana, R. D. De Silva","doi":"10.4038/josuk.v15i2.8073","DOIUrl":"https://doi.org/10.4038/josuk.v15i2.8073","url":null,"abstract":"","PeriodicalId":444777,"journal":{"name":"Journal of Science of the University of Kelaniya Sri Lanka","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117274185","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}
Pub Date : 2022-10-24DOI: 10.4038/josuk.v15i2.8064
N. Nayakarathna, R. Gunathilaka, G. Ganehiarachchi
{"title":"Aspects of the biology of Phlebotomus argentipes (Diptera: Psychodidae) in Kurunegala district","authors":"N. Nayakarathna, R. Gunathilaka, G. Ganehiarachchi","doi":"10.4038/josuk.v15i2.8064","DOIUrl":"https://doi.org/10.4038/josuk.v15i2.8064","url":null,"abstract":"","PeriodicalId":444777,"journal":{"name":"Journal of Science of the University of Kelaniya Sri Lanka","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114901045","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}
Pub Date : 2022-10-03DOI: 10.4038/josuk.v15i2.8054
W. Wijesundara, T. C. J. Thambiliyagodage, R. Wijesekera
{"title":"Catalytic reduction of methylene blue by magnetite - silica composite","authors":"W. Wijesundara, T. C. J. Thambiliyagodage, R. Wijesekera","doi":"10.4038/josuk.v15i2.8054","DOIUrl":"https://doi.org/10.4038/josuk.v15i2.8054","url":null,"abstract":"","PeriodicalId":444777,"journal":{"name":"Journal of Science of the University of Kelaniya Sri Lanka","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127852876","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}
Pub Date : 2022-07-05DOI: 10.4038/josuk.v15i1.8052
M. Gunawardana, M. M. Wijesooriya, G. Randima, K. Atapaththu, K. Sanjaya, K. Masakorala, S. W. Gamage
Microcystins (MCs) and cylindrospermopsin (CYN) are the most abundant toxins produced by cyanobacteria in tropical freshwaters. We studied the spatial distribution of MC and CYN in two multipurpose reservoirs, Mahakanadarawa and Nachchaduwa in Anuradhapura district in Sri Lanka in September 2020. Fourteen water quality parameters, phytoplankton composition, chlorophyll- a , MC and CYN concentrations were analyzed in triplicate in 25 sampling sites from each reservoir. Both reservoirs were at hypereutrophic status. Microcystis was the dominant cyanobacteria with 0-3.75 x 10 3 cell/mL in Mahakanadarawa and 1-7 x 10 3 cell/mL in Nachchaduwa. Besides Microcystis , no other potential MC-producing cyanobacteria were observed. In Mahakanadarawa, MC was detected in the range of 0.11-1.63 µg/L which was above the WHO permissible level (1.0 µg/L) for drinking water. Although comparatively high Microcystis cell density was present in Nachchaduwa, its MC concentration was low (0.06-0.17 µg/L). The CYN concentration in Nachchaduwa was above the WHO permissible level (0.7 µg/L) for drinking water. It was 0.20-1.02 µg/L in Nachchaduwa and 0.03-0.08 µg/L in Mahakanadarawa. We did not observe any potential CYN-producing cyanobacteria in either of the reservoirs. There was no relationship between the spatial distribution pattern of MC and Microcystis cell density in both reservoirs. Although the majority of physico-chemical properties of water indicated suitability for drinking, co-occurrence of high concentrations of MC and CYN indicated their unsuitability for drinking. Hence, this study highlights the necessity for routing detection of cyanotoxins in both reservoirs. Further, our findings alarm potential health risks for the local community that relies on Mahakanadarawa and Nachchaduwa reservoirs for drinking, irrigation and fisheries.
{"title":"Co-occurrence of microcystin and cylindrospermopsin in hypereutrophic Mahakanadarawa and Nachchaduwa reservoirs","authors":"M. Gunawardana, M. M. Wijesooriya, G. Randima, K. Atapaththu, K. Sanjaya, K. Masakorala, S. W. Gamage","doi":"10.4038/josuk.v15i1.8052","DOIUrl":"https://doi.org/10.4038/josuk.v15i1.8052","url":null,"abstract":"Microcystins (MCs) and cylindrospermopsin (CYN) are the most abundant toxins produced by cyanobacteria in tropical freshwaters. We studied the spatial distribution of MC and CYN in two multipurpose reservoirs, Mahakanadarawa and Nachchaduwa in Anuradhapura district in Sri Lanka in September 2020. Fourteen water quality parameters, phytoplankton composition, chlorophyll- a , MC and CYN concentrations were analyzed in triplicate in 25 sampling sites from each reservoir. Both reservoirs were at hypereutrophic status. Microcystis was the dominant cyanobacteria with 0-3.75 x 10 3 cell/mL in Mahakanadarawa and 1-7 x 10 3 cell/mL in Nachchaduwa. Besides Microcystis , no other potential MC-producing cyanobacteria were observed. In Mahakanadarawa, MC was detected in the range of 0.11-1.63 µg/L which was above the WHO permissible level (1.0 µg/L) for drinking water. Although comparatively high Microcystis cell density was present in Nachchaduwa, its MC concentration was low (0.06-0.17 µg/L). The CYN concentration in Nachchaduwa was above the WHO permissible level (0.7 µg/L) for drinking water. It was 0.20-1.02 µg/L in Nachchaduwa and 0.03-0.08 µg/L in Mahakanadarawa. We did not observe any potential CYN-producing cyanobacteria in either of the reservoirs. There was no relationship between the spatial distribution pattern of MC and Microcystis cell density in both reservoirs. Although the majority of physico-chemical properties of water indicated suitability for drinking, co-occurrence of high concentrations of MC and CYN indicated their unsuitability for drinking. Hence, this study highlights the necessity for routing detection of cyanotoxins in both reservoirs. Further, our findings alarm potential health risks for the local community that relies on Mahakanadarawa and Nachchaduwa reservoirs for drinking, irrigation and fisheries.","PeriodicalId":444777,"journal":{"name":"Journal of Science of the University of Kelaniya Sri Lanka","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129114153","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}
Pub Date : 2022-06-28DOI: 10.4038/josuk.v15i1.8050
S. Jayasundara, G. Ganehiarachchi, R. Gunathilaka
{"title":"Effect of five medicinal plant leaves on survival, oviposition and progeny development of cowpea bruchid, Callosobruchus maculatus (F.) infesting cowpea seeds in storage","authors":"S. Jayasundara, G. Ganehiarachchi, R. Gunathilaka","doi":"10.4038/josuk.v15i1.8050","DOIUrl":"https://doi.org/10.4038/josuk.v15i1.8050","url":null,"abstract":"","PeriodicalId":444777,"journal":{"name":"Journal of Science of the University of Kelaniya Sri Lanka","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134305110","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}
Pub Date : 2022-06-28DOI: 10.4038/josuk.v15i1.8053
G. Ranasinghe, M. Perera, I. Perera
{"title":"Detection of Clostridium perfringens and associated preventive measures to appraise the safe meat curry consumption in the Colombo city","authors":"G. Ranasinghe, M. Perera, I. Perera","doi":"10.4038/josuk.v15i1.8053","DOIUrl":"https://doi.org/10.4038/josuk.v15i1.8053","url":null,"abstract":"","PeriodicalId":444777,"journal":{"name":"Journal of Science of the University of Kelaniya Sri Lanka","volume":"165 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127199541","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}
Pub Date : 2022-04-05DOI: 10.4038/josuk.v15i1.8048
L. D. Amarasinghe, P. Menike
{"title":"The abundance of mosquito larvae in relation to associated microbiota and physicochemical parameters of marshland habitats in Kelaniya in Gampaha district of Sri Lanka","authors":"L. D. Amarasinghe, P. Menike","doi":"10.4038/josuk.v15i1.8048","DOIUrl":"https://doi.org/10.4038/josuk.v15i1.8048","url":null,"abstract":"","PeriodicalId":444777,"journal":{"name":"Journal of Science of the University of Kelaniya Sri Lanka","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125600873","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}
Pub Date : 2022-04-05DOI: 10.4038/josuk.v15i1.8043
W. T. H. Fernando, H. K. V. S. Jayarathna, M. N. Kaumal
{"title":"Low-cost microfluidic electrochemical paper-based device to detect glucose","authors":"W. T. H. Fernando, H. K. V. S. Jayarathna, M. N. Kaumal","doi":"10.4038/josuk.v15i1.8043","DOIUrl":"https://doi.org/10.4038/josuk.v15i1.8043","url":null,"abstract":"","PeriodicalId":444777,"journal":{"name":"Journal of Science of the University of Kelaniya Sri Lanka","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131283669","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}
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