Volume 4

Cytogeno Toxicity Evaluation of Waste Water Effluent Discharged from Service Station using Allium Cepa Bioassay

2019-06-01T00:00:00Z

Cytogeno Toxicity Evaluation of Waste Water Effluent Discharged from Service Station using Allium Cepa Bioassay Nimalanathan, K.; Nimalan, J. Industrial effluents are a main source of toxicants which cause adverse effects on flora, fauna and human health. In order to determine the cytogeno-toxic effects of effluents from service station, Allium cepa bioassay was used. Effluent samples were collected from discharge point and physiochemical characters were evaluated. In growth inhibition assay, root lengths of Allium cepa were measured after 7 days ' exposure in effluents (O, 1,5, 75, and 100% concentration) to determine the EC50 (Effective concentration for 50% of growth inhibition). The genotoxicity assay was carried out after 48hrs exposure in effluents (0.01, 0.1, 1, and 10% concentration). Root tip cells were observed under the microscope and the mitotic index (MI), frequency of aberrant cells were calculated. The values of physiochemical characteristics were within the national tolerance limits specified for waste water. There were strong correlations between the concentration and growth inhibition (R2 = 0.97). Effluent had 50% (EC50) of growth inhibitory effects in 80 % of the discharged concentration. The root growth retardation was significantly concentration dependent (P < 0.05). MI values were decreased and total number of aberrated cells were increased with increasing concentration. The dominant aberrations were sticky meta and sticky anaphases. The damages, including bridges, vagrants and c-metaphases and polar slips were also observed in low effluent concentrations. It is concluded that the toxic effect and growth inhibition can be reduced further by diluting the effluent. The proposed A.cepa bioassay is a reliable tool for this study. Genotoxic effects of other industrial effluents can also be monitored by using this assay

Evaluation of Growth and Yield Parameters of Exotic and Local Rice Hybrid Varietiesin Low Country Intermediate Zone

2019-06-01T00:00:00Z

Evaluation of Growth and Yield Parameters of Exotic and Local Rice Hybrid Varietiesin Low Country Intermediate Zone Priyantha, W.S.; Witharana, D.D.; Hemachandra, R.P.D.H. Exotic hybrid rice varieties were evaluated to identify the adaptable rice hybrids for local environment. An experiment was conducted adopting Randomized Complete Block Design with 03 replicates in Yala2016 and Maha2016/17 at Rice Research and Development Institute. Eleven treatments were included six exotic rice hybrids, two local rice hybrid and three inbred standard check varieties. Yield and yield components were recorded and data analysis was done using SAS software package. Standard heterosis (SH) of all hybrids was calculated compared with standard check varieties which come under the same age group. In Yala season three months aged two exotic and local hybrids (CH3, CHS HRIO) showed SH of-39.08%, -34.07%, 22.66% respectively. Three and a half (3 1/2) months four exotic hybrids CH4, CH6, CH7, CH8 showed SH of-11.19%, -11.22%, -0.86% and 14.44% and 4-month local hybrid showed standard heterosis of 1.90%. Exotic hybrid CH8 showed positive standard heterosis (14.44%) but did not show potential level of SH (>15%). HRIO local rice hybrid variety is having positive SH of 22.6% when compared to the exotic rice hybrid varieties. In Maha season grain yield of six exotic hybrids were 4.88, 4.86, 4.33, 4.28, 4.82, 4.82 t hal and grain yield of two local hybrids were 4.27, 5.67 t hãl. Three months two exotic and local hybrids (CH3, CH5, HRIO) showedSH0f7.62%, -4.14%, 33.81%. 3 1/2 months four exotic hybrids CH4, CH6, CH7, CH8 showed SH of6.93%, -6.25%, 5.86%, 5.28% and 4month local hybrid 407H showed SH of 0.75%. In Yala season exotic hybrid rice varieties (CH3, CH4, CHS CH6.CH7 and CH8) not performed potential level of SH. But in the Maha season hybrid varieties such as CH3, CH4, CH7 and CH8 showed the positive SH and but not exceed the potential level SH Result concluded that exotic rice hybrid varieties did not perform better in the low country intermediate conditions compared to the local rice hybrid varieties

The Nexus between Gross Domestic Product and Prosperity Index in Sri Lanka 2014-2016

2019-06-01T00:00:00Z

The Nexus between Gross Domestic Product and Prosperity Index in Sri Lanka 2014-2016 Dilinika, W.A.P.I.; Rathayaka, R.M.D.C. Gross domestic product (GDP) is a basic measure of the economic performance of a country. It is the market value of all final goods and services produced in the given year. Prosperity index is a composite indicator that measures and compares the level of prosperity of the country and its provinces. It is a multi-dimensional indicator about country or provinces. As a developing country Sri Lanka 's overall prosperity index was 0.864 in 2015. The prosperity index is categorized into three sub categories as Economic and Business Climate, Well-being of the people and Socio-Economic Infrastructure. All the sub categories have equal weights. Not necessary to talk about the relationship between Economy and Business Climate and economic performance. This paper investigates the relationship between the Gross Domestic Product and well-being of the people and Socio-Economic infrastructure, Sri Lanka 20142016. The data was collected through the Reports of Central Bank of Sri Lanka 20142016. Under the hypothesis, the Spearman's correlation coefficient provides that unemployment rate is not significantly related with gross domestic product and the well-being of the people sub-index, not only that but also there is no significant positive or negative relationship between GDP and well-being of the people sub index. As well as there is no significant positive relationship between GDP and Socio-Economic infrastructure sub-index. Therefore, Sri Lanka a experience that there is no influence in Economic performance and human well-being and socio-economic infrastructure

Design and Implementation of an OER Portal Service

2019-06-01T00:00:00Z

Design and Implementation of an OER Portal Service Palanisamy, V.; Dasanayake, S.; Thanabalasingam, V.; Singaneththige, B.; Lebbe, F.S.; Mohamed, F. Over the last several years, "openness " has emerged as an important trend in education Open educational resources (OER) are freely accessible and openly licensed documents are available either in licensed under an open copyright license or in the public domain OER services promise to provide a higher level of educational materials and innovative educational services for the openness in education. ICT becomes more affordable and internet access seems increasingly everywhere is the important reason for this development. The primary aim of this paper is to develop the working prototype of an OER portal service, by developing a metadata repository engine and a web portal front-end The OER portal service is focused on connecting the students and staffs of the Sri Lankan Universities through the web portal and the resources are based on the higher education curriculum. Sri Lankan University students feel some barriers when they use worldwide OER services such as inconsistent unavailability of local language materials, and difficult to search for the correct materials which suitable to their curriculum. An OER portal service is therefore, developed for promoting the use of OER across our country's higher educational institutions md resolving the problems that the students faced in using the available OER services. Currently, there is no Sri Lankan higher education curriculum based OER services available to help the students and staff or their learning and teaching process. This OER web portal is a good place to find, create, share and publish open resources and software. It provides a friendly search engine to open educational resources from metadata repository with subject and description listings. It also offers social network features, live stream lectures and student online conference, online broadcasting and live events