197,624 research outputs found
(A) Study on the role of tax amnesties in personal income tax compliance in Sri Lanka
No full textThesis(Master) --KDI School:Master of Public Policy,2010masterpublishedby R. M. Jayasinghe
Chlorotic mottle of bean (Phaseolus vulgaris L.)
No full textFor the past years there have been outbreaks of a disease of bean ( Phaseolus vulgaris L.) in Colombia called bean chlorotic mottle. The etiology of bean chlorotic mottle was not known, but the disease was generally believed to be incited by the same whitefly-transmitted virus that causes variegation in malvaceous plants. The aim of this study was to identify and further characterize the causal agent of bean chlorotic mottle.As from the literature it was not clear which symptoms were characteristic of the disease, firstly a symptom had to be established common to all allegedly bean chlorotic mottle-affected bean plants. This symptom, a sharp mosaic in which the discoloured areas ranged from pale greenish-yellow to bright yellow, was of diagnostic value to detect infected plants in the field. In addition to this sharp mosaic, chlorotic mottle-affected bean plants in the field often showed a host of other symptoms, such as mild mottle, rugosity, leaf curling, malformation, dwarfing, proliferation and witches' broom-like growth. In the same affected population some bean plants showed only the sharp mosaic, whereas others showed additional witches' broom-like growth.Mechanical inoculation experiments conducted with crude sap and partially purified preparations from bean plants exhibiting chlorotic mottle in the field, showed three viruses to be present, viz. bean mild mosaic virus, cucumber mosaic virus and southern bean mosaic virus. By means of differential hosts these three viruses could be separated. Isolates of these viruses were designated BMMV-CIAT, CMV-CIAT and SBMV-CIAT, respectively. Experiments conducted with whiteflies did not reveal the presence of any whitefly-transmitted virus in chlorotic mottle-affected bean plants.BMMV-CIAT, is an isometric particle, 32 nm in diameter, with a single-stranded RNA molecule. The virus is readily transmitted mechanically and its host range is restricted to legumes, viz. Glycine max , Macroptilium spp., Phaseolus spp. and Rhynchosia minima . In P. vulgaris the virus usually causes a mild mosaic which is hardly visible, and in certain cultivars with age, the virus becomes latent. Though affected bean plants grew normally producing healthy- looking pods, flowering and pod formation were usually delayed by about a week under glasshouse conditions. The chrysomelid beetles Diabrotica balteata and Cerotoma facialis were efficient vectors of BMMV-CIAT. The virus is seed-transmitted in beans, percentages ranging from 1.2 to 3.6 in the different cultivars tested. In contrast to many other beetle-transmitted viruses, BMMV-CIAT sediments in sucrose gradients as one particle. The physical and chemical properties of BMMV-CIAT are similar or equal to those of BMMV described by Waterworth et al. (1977). The darkly stained granular material in root cells occasionally observed in the light microscope, proved to be aggregates of virus particles.Cross protection and serological tests showed that CMV-CIAT is related to the CMV-type strain. However, many differences exist between them, the most striking being the ability of CMV-CIAT to cause systemic mosaic in P. vulgaris . The host reactions of CMV- CIAT resembled those of CMV-B 32, an isolate from bean in Spain (Bos and Maat, 1974), but the former had a longer longevity in vitro . Generally, CMV-CIAT induced a yellow mosaic in P. vulgaris , but the symptoms varied greatly in different cultivars. In the cultivars Honduras 46 and Porrillo 1 a sharp mosaic, similar to chlorotic mottle, was produced one month after inoculation with CMV-CIAT None of the bean cultivars and CIAT advanced breeding lines tested were found to be resistant or hypersensitive to CMV-CIAT The virus is transmitted by Aphis gossypii and through seeds of P. vulgaris , Vigna radiata and V. unguiculata 'California Blackeye'. It has poor antigenic properties and is serologically related to CMV-B 32, to a CMV isolate from Yucca (Bouwen et al., 1978) and to the Y-strain of CMV (Scott, 1968). Large inclusions in plant tissues infected with CMV-CIAT could easily be detected in the light microscope.The third virus, SBMV-CIAT, is readily transmitted mechanically. Though the host plant range included mostly legumes, the virus also infected Cucumis sativus 'Ashley'. The virus was more harmful to P. acutifolius , in which it caused severe top necrosis, than to P. vulgaris . Among the cultivars and CIAT advanced breeding lines of P. vulgaris , hypersensitive hosts were found. The virus induced a bright yellow mosaic in G. max . Besides P. vulgaris 'Pinto U.I. 650' other suitable assay hosts for SBMV-CIAT were found viz. Mucuna pruriens and M. utilis which reacted with pin-point necrotic local lesions to the virus. SBMV-CIAT is seed transmitted, the percentages ranging from 3.6 to 33.6 depending on the bean cultivar. Thephysical and chemical properties of SBMV-CIAT are similar or equal to the SBMV bean strain, except for the guanine content of the nucleic acid.An experiment conducted to find out the effect of the above- mentioned viruses alone or in combination with each other on bean plants, indicated that symptoms resembling chlorotic mottle could be reproduced in bean plants by mechanical inoculation with CMV-CIAT alone or in combination with the other two viruses. The vast range of other symptoms sometimes exhibited by bean plants with chlorotic mottle in the field, could also be reproduced by mechanically inoculating the viruses in different combinations at different times after planting of seeds. Witches' broom-like symptoms were produced in bean plants inoculated on their primary leaves with a mixture containing SBMV-CIAT with BMMV-CIAT or with CMV-CIATFrom the present study it is clear that bean chlorotic mottle, as described in literature, is a composite disease caused by a combination of BMMV-CIAT, CMV-CIAT and SBMV-CIAT in which CMV-CIAT is responsible for the sharp mosaic and the other two viruses together are responsible for the additional symptoms like rugosity, leaf curling, witches' broom-like growth etc. Efficient vectors of these viruses are present in the bean fields. Though data are not available for the population distribution of aphids, chrysomelid beetles are present throughout the year in the CIAT fields. Seed transmission of the virus is of considerable epidemiological significance. Infected seeds are vehicles for long distance transport and survival from one season to another, especially in case of BMMV-CIAT, and BMMV-CIAT which have a narrow host range. The diseases caused by the three viruses might be controlled by reducing the number of infection sources and by limiting the spread of the viruses
Flow behaviour of dielectric liquids in an electric field
No full textA family of 10 silicone oils with electrical conductivity similar to 10(-13) S m(-1) (a regime hitherto systematically unexplored) and viscosities ranging from 1 to 2000mPas have been Subjected to an electrical field of up to 1.5kV mm(-1) during flow from a needle. The flow behaviour of these liquids is investigated experimentally in the flow rate regime 10(-8)-10(-12) m(3) s(-1) and we analyse the results using the Ohnesorge number. Due to the low electrical conductivity and high electrical relaxation time of the silicone oils, only unsteady transient jets were found. The onset of this type of jetting has been defined using current measurements and, in contrast to conducting liquids, the non-dimensional jet diameter increases with increase in Ohnesorge number. The time elapsed between the start and finish of jetting increases with increasing Ohnesorge number
Energy poverty in Sri Lanka
No full textUnderstanding energy poverty is fundamental to any efforts to alleviate it. This paper, using the latest (2016) Sri Lankan Household Income and Expenditure survey data, examines the incidence, intensity, inequality, and determinants of energy poverty in Sri Lanka, by constructing the Multidimensional Energy Poverty Index (MEPI). The MEPI is calculated using a set of seven key indicators representing multiple dimensions of energy and assigning weights by using the Principal Component Analysis (PCA). Sri Lankan households, on average, are experiencing a moderate level of energy poverty (with MEPI of 0.431) where the lack of access to modern cooking fuel is the largest contributor to energy poverty. Results of this study revealed notable differences in energy poverty by gender, age, ethnicity, and income group of the head of the household and by sub-national location of the household. Significant differences in inequality in energy poverty were also observed by sub-national location and income. While energy-poor households are not necessarily always income-poor, income and other socio-demographic and geographical factors are strongly associated with energy poverty in Sri Lanka. The findings of this study raise alarms for the possible adverse implications on health and education attainment of the energy-poor. Overall, the results provide valuable policy insights into one of the most neglected dimensions of the post-war development policy agenda in Sri Lanka, in particular, and other developing countries, in general.Full Tex
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Model for the adoption of telemedicine in Sri Lanka
No full textWe report the results of the study that explored the factors characterizing the introduction of telemedicine to the rural areas of Sri Lanka. A model was developed from the analysis of the literature, expert review, and a field study conducted in three districts of Sri Lanka, which involved clinicians, hospital staff, and the general public from both rural and urban areas. Health ministry officials, medical directors, and consultants from urban areas were also consulted. Quantitative data from the questionnaires, and qualitative data from the interviews, were analyzed to investigate the impact on culture, technology, and infrastructure when adopting a telemedicine system in rural areas of Sri Lanka. The TeleMedicine in Sri Lanka (TMSL) model is presented, which expresses the factors that hinder the acceptance of telemedicine in Sri Lanka. The key findings are that an understanding of the culture of Sri Lanka and additional computing skills are essential when implementing a telemedicine system in the rural areas of the country
Marijuana-induced recurrent acute coronary syndrome with normal coronary angiograms
No full textWe report a case of a man in his 40s presented to the emergency department twice, 1 month apart, with severe ischaemic sounding chest pain within 1 h of smoking marijuana on both occasions. He had elevated serial biomarkers and ischaemic electrocardiogram changes. His coronary angiograms on both episodes were entirely normal along with normal echocardiogram. This potentially suggests a coronary vasospasm as an underlying mechanism for these non-ST elevation myocardial infarctions. This should alert clinicians and the public alike to this potential risk of cannabis use.[Safaa AM, Markham R, Jayasinghe R. Marijuana-induced recurrent acute coronary syndrome with normal coronary angiograms.No Full Tex
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
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