Vidyodaya Journal of Science最新文献_第9页

Nucleotide Sequence and Secondary Structure Variations in ITS2-rDNA Region of the Members of Anopheles culicifacies (Diptera: Culicidae) Species Complex 库氏按蚊(双翅目:库蚊科)种复合体成员ITS2-rDNA区核苷酸序列及二级结构变异

Vidyodaya Journal of Science Pub Date : 2016-12-01 DOI: 10.31357/VJS.V20I1.3362

K.V.H. Shanika, I. Harischandra, B. Silva

{"title":"Nucleotide Sequence and Secondary Structure Variations in ITS2-rDNA Region of the Members of Anopheles culicifacies (Diptera: Culicidae) Species Complex","authors":"K.V.H. Shanika, I. Harischandra, B. Silva","doi":"10.31357/VJS.V20I1.3362","DOIUrl":"https://doi.org/10.31357/VJS.V20I1.3362","url":null,"abstract":"Anopheles culicifacies, major vector of malaria in Sri Lanka is a five member species complex. Differences of the vector competence of siblings, is still poorly delineated. Therefore, the current study was carried out to observe any relationship of the variations in vector competence to ITS2 nucleotide sequences and secondary structure characteristics of the species complex. DNA was extracted from sibling species B and E, the ITS2 region was amplified and sequenced. Sequences for A, C and D siblings were retrieved from NCBI GenBank. The complex divided into two groups, AD and BCE based on primary and secondary structure of the ITS2 sequences. Secondary structures of all species had three helices where pyrimidine-pyrimidine mismatch in Helix II and a UUUGG motif at 5‘ of Helix III were displayed only for B, C and E. Among five types of loops, interior and exterior loops were more conserved than other loop types. Results showed the major vector sibling E and poor or non vector sibling B shares identical nucleotide sequence and secondary structure. Therefore, ITS2 secondary structure is independent of the vector competence of the sibling species.","PeriodicalId":214405,"journal":{"name":"Vidyodaya Journal of Science","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122493477","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}

引用次数: 0

Towards a Steady State Economy in Sri Lanka 斯里兰卡走向稳定的经济

Vidyodaya Journal of Science Pub Date : 2016-12-01 DOI: 10.31357/VJS.V20I1.3363

A. Wijeratne, P. Dias, N. Adhikari

{"title":"Towards a Steady State Economy in Sri Lanka","authors":"A. Wijeratne, P. Dias, N. Adhikari","doi":"10.31357/VJS.V20I1.3363","DOIUrl":"https://doi.org/10.31357/VJS.V20I1.3363","url":null,"abstract":"In general, it is desired that Sri Lankan economy shows growth. A growing economy brings waste production which leads environmental pollutions such as air pollution water pollution etc. At present, increasing population in Sri Lanka requires more natural resources to meet the market demand. The ultimate result is an imbalance in the biological cycles, and an irreversible change in both economic process and environment. An irreversible economic process increases entropy. Ultimately, the entropy will reach its maximum value. Then everything will become standstill since there would not exist more energy to continue the economic process. As a solution, the concept of a steady state economy is structured.Sri Lankan economy was assessed within steady state economics to evaluate the present economic situation of Sri Lanka. A statistical analysis was carried out on Gross Domestic Product (GDP), population, energy use, CO2 emission through time series analysis and regression analysis,to identify the extent to which Sri Lankan economy has deviated from a steady state economy. Regression analysis indicates a strong relationship between GDP and CO2 emission. Total population size in Sri Lanka is increased from 9.9 million in 1960 to 20.48 million in 2013. CO2 emission per capita is increased from 0.25 metric tons in 1960 to 0.65 metric tons in 2010. CO2 emission is increased from 2259 kiloton in 1960 to 12831 kiloton in 2010. Rapid growth rates, CO2 emissions, population growth rates reveal that Sri Lankan economy is far apart from the concept of steady state.Transition to a steady state economy would require the implementation of new policies to restrict the utilization of nonrenewable resources. On the other hand it is mandatory to have legal regulations encouraging renewable resource use, energy efficiency, and reuse and recycling.","PeriodicalId":214405,"journal":{"name":"Vidyodaya Journal of Science","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128113334","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}

引用次数: 4

Android Application: Sound Pressure Level Meter and Frequency Spectrum Analyzer Android应用程序:声压级计和频谱分析仪

Vidyodaya Journal of Science Pub Date : 2016-12-01 DOI: 10.31357/VJS.V20I1.3361

N. D. N. C. Bandara, W. Wanniarachchi

引用次数: 0

Distribution of the vibration effect within the stacked boxes during vehicular road transportation of tomatoes 番茄车辆公路运输过程中堆垛箱内振动效应的分布

Vidyodaya Journal of Science Pub Date : 2016-07-11 DOI: 10.31357/VJS.V19I1.2473

C. Ranatunga, H. Jayaweera, S. Suraweera, T. Ariyaratne

{"title":"Distribution of the vibration effect within the stacked boxes during vehicular road transportation of tomatoes","authors":"C. Ranatunga, H. Jayaweera, S. Suraweera, T. Ariyaratne","doi":"10.31357/VJS.V19I1.2473","DOIUrl":"https://doi.org/10.31357/VJS.V19I1.2473","url":null,"abstract":"Parameters of the Road-Vehicle-Load system influence the vibration effects generated at vehicular road transportation. Vertical vibration acceleration (PSDmax) experienced by the tomato boxes and tomatoes within the box was studied using the popular transport means in Illukkumbura area in Matale. The road quality was estimated using the International Road Roughness Index (IRI). Fully loaded Mitsubishi Canter truck at an average speed of 20 kmh-1 on a road rated at IRI between 2 to 3.5 mm/m registered increasing trend in the PSD of vibration from the front side towards the rear side of the truck in the horizontal direction. The observed average PSD values are in the approximate ratio, front : middle : rear ≈ 1 : 3: 6. Also the PSD of the vibration was found to be amplified from the bottom stack towards the topmost stack in the vertical direction. The observed average PSD values at 1st, 2nd, 3rd, and 4th stacks are in the approximate ratio, 1 : 1 : 1.5 : 2.5. PSD of vibration was studied with a fully loaded truck at different speeds on a road consisting of segments rated at varying IRI. The fully loaded truck at different speeds on a road consisting of segments rated at varying IRI registered varying PSD values of vibration. Even at lower speeds such as 25 kmh-1 the vibration acceleration produced at “poor” quality (IRI > 5 mm/m) roads was nearly 4 times higher compared to that produced at “fair” (IRI 2 to 3.5 mm/m) or “good” quality (IRI 0.9 to 2 mm/m) roads. Registered pattern of the PSD appears to be similar at the tomato boxes and at the tomatoes within the same box.","PeriodicalId":214405,"journal":{"name":"Vidyodaya Journal of Science","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124637416","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}

引用次数: 2

Diversity and abundance of Small Mammals in Giritale Nature Reserve 吉里塔勒自然保护区小型哺乳动物的多样性和丰度

Vidyodaya Journal of Science Pub Date : 2015-08-20 DOI: 10.31357/VJS.V18I1.2456

Indika A.V.D.J., Mahaulpatha W.A.D.

{"title":"Diversity and abundance of Small Mammals in Giritale Nature Reserve","authors":"Indika A.V.D.J., Mahaulpatha W.A.D.","doi":"10.31357/VJS.V18I1.2456","DOIUrl":"https://doi.org/10.31357/VJS.V18I1.2456","url":null,"abstract":"The composition of small mammal communities in forest, shrub land, grassland and anthropogenic habitats of the Giritale Nature Reserve of north central Sri Lanka was studied from June 2006 to August 2007 to estimate the abundance and diversity of small mammals inhabiting this nature reserve. Live trapping using Sherman traps and Pitfall traps were adopted to catch the small mammals. A total of 71 individuals representing two orders (Insectivora and Rodentia) and three families (Soricidae, Muridae, Scuridae) was captured. Species recorded included Suncus murinus murinus Linnaeus, 1766 (Common Indian Musk Shrew), Mus cervicolor fulvidiventris Blyth, 1852 (Ceylon Field Mouse), Mus mus culuscastaneus Waterhouse, 1843 (Indian Field Mouse), Mus fernandoni Phillips, 1932 (Ceylon Spiny Mouse), Rattus blanfordi Thomas, 1881 (White Tailed Rat), Funambulus palmarum Linnaeus, 1766 (Indian Palm Squirrel) and Rattus rattus. The species Rattus rattus consisted of two subspecies Rattus attusrattus Linnaeus, 1758 (Common House Rat) and Rattus rattus rufescens Gray, 1837 (Indian House Rat). Highest and lowest abundances were recorded in the grasslands (0.08) and shrub lands(0.01), respectively. Highest diversity index was recorded in anthropogenic habitats (1.62), which included paddy fields, home gardens and buildings, while lowest diversity index was recorded in shrub lands (0.67). The number of small mammals captured was significantly different in the four habitat types (χ2 = 22.69, df = 3, p<0.05). This study, which is the first detailed examination of terrestrial small mammals in a dry zone forest of Sri Lanka, indicated that the Giritale Nature Reserve is home to six species of small mammals. Key words: Abundance, Diversity, Evenness, Nature reserve, Small mammals","PeriodicalId":214405,"journal":{"name":"Vidyodaya Journal of Science","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126657572","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}

引用次数: 0

Fat contents and fatty acid profiles of Indian Scad 印度鳕鱼的脂肪含量和脂肪酸谱

Vidyodaya Journal of Science Pub Date : 2013-09-07 DOI: 10.31357/VJS.V16I0.1699

E.K.I Chrishanthi, M. Attygalle

引用次数: 1

STABLE ULTRA - FAST HIGH POWER CO2 LASER PULSE GENERATION 稳定的超高速高功率co2激光脉冲产生

Vidyodaya Journal of Science Pub Date : 2013-05-08 DOI: 10.31357/VJS.V1I1

I. Perera

引用次数: 1

Monitoring aflatoxin contamination risks in red pepper spice produced in Turkey 监测土耳其生产的红辣椒香料中的黄曲霉毒素污染风险

Vidyodaya Journal of Science Pub Date : 2012-11-30 DOI: 10.31357/VJS.V15I0.277

P. Basaran, A. Bektes

引用次数: 1

Potential of Olax zeylanica (Olacaceae) as a botanical insecticide for the control of the Maize Weevil Sitophilus zeamais Motschulsky 油葵科油葵作为植物性杀虫剂防治玉米象象的潜力

Vidyodaya Journal of Science Pub Date : 2012-11-30 DOI: 10.31357/VJS.V15I0.279

M. Karunaratne, M. Perera

{"title":"Potential of Olax zeylanica (Olacaceae) as a botanical insecticide for the control of the Maize Weevil Sitophilus zeamais Motschulsky","authors":"M. Karunaratne, M. Perera","doi":"10.31357/VJS.V15I0.279","DOIUrl":"https://doi.org/10.31357/VJS.V15I0.279","url":null,"abstract":"The possible use of leaf powder of Olax zeylanica in managing the maize weevil, Sitophilus zeamais was investigated in the present study. Mortality of one week old adults was obtained for five different doses each for their insecticidal effect (1.0, 2.0, 3.0, 5.0 and 7.5g) and fumigation toxic activity (2.0, 3.0, 5.0, 7.5, 10.0g) separately. In each bioassay, the mortality was recorded after 3, 6, 9, 12, 18 and 24 hours after they were exposed to different doses of the plant powder. The results of both bioassays revealed that the leaf powder of this plant elicited a very high insecticidal activity as well as fumigation toxic activity in S. zeamais weevils. Mortality effect of the powders on the weevils was found to be dose and time dependent. The observations indicated that the adult mortality increased with the increase of the exposure time and the dose. No mortality was observed 3 hours after the exposure of weevils to leaf powder at all doses. A high mortality rate was observed after 9 hours of exposure with all doses except for the lowest and a 100% mortality was recorded with 7.5g after 24 hours. Fumigation toxicity of plant powder against the weevils also gave similar results where no weevil deaths were observed at all doses of leaf powder after 3 hours of exposure. At the highest dose of 10.0g, 98% mortality was observed after 24 hours. The overall results imply the strong possibility of using leaves of Olax zeylanica as a potent bio-insecticide in protecting maize grains from S. zeamais infestations.","PeriodicalId":214405,"journal":{"name":"Vidyodaya Journal of Science","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117319214","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}

引用次数: 0

A simplified non radioactive DNA probe technique for the field detection of sibling species A of the Anopheles culicifacies (Diptera: Culicidae) complex 库氏按蚊(双翅目:库蚊科)复合体兄弟种A的简化非放射性DNA探针技术

Vidyodaya Journal of Science Pub Date : 2012-11-30 DOI: 10.31357/VJS.V15I0.280

B. D. Silva, G. Hapugoda, Eh Karuuanayake

引用次数: 0