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Search Results: 1 - 10 of 198119 matches for " N. Liyanage "
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The reaction dynamics of the 16O(e,e'p) cross section at high missing energies
Jefferson Lab Hall A Collaboration,N. Liyanage
Physics , 2000, DOI: 10.1103/PhysRevLett.86.5670
Abstract: We measured the cross section and response functions (R_L, R_T, and R_LT) for the 16O(e,e'p) reaction in quasielastic kinematics for missing energies 25 <= E_miss <= 120 MeV at various missing momenta P_miss <= 340 MeV/c. For 25 < E_miss < 50 MeV and P_miss \approx 60 MeV/c, the reaction is dominated by single-nucleon knockout from the 1s1/2-state. At larger P_miss, the single-particle aspects are increasingly masked by more complicated processes. For E_miss > 60 MeV and P_miss > 200 MeV/c, the cross section is relatively constant. Calculations which include contributions from pion exchange currents, isobar currents and short-range correlations account for the shape and the transversity but only for half of the magnitude of the measured cross section.
Proteomic analysis of Salmonella enterica serovar Enteritidis following propionate adaptation
Leona N Calhoun, Rohana Liyanage, Jackson O Lay, Young Kwon
BMC Microbiology , 2010, DOI: 10.1186/1471-2180-10-249
Abstract: In this study, we used 2 D gel electrophoresis to examine the proteomes of PA adapted and unadapted S. Enteritidis and have identified five proteins that are upregulated in PA adapted cultures using standard peptide mass fingerprinting by MALDI-TOF-MS and sequencing by MALDI LIFT-TOF/TOF tandem mass spectrometry. Of these five, two significant stress-related proteins (Dps and CpxR) were shown (via qRT-PCR analysis) to be upregulated at the transcriptional level as well. Unlike the wild type when adapted to PA (which demonstrates significant acid resistance), PA adapted S. Enteritidis ?dps and S. Enteritidis ?cpxR were at a clear disadvantage when challenged to a highly acidic environment. However, we found the acid resistance to be fully restorable after genetic complementation.This work reveals a significant difference in the proteomes of PA adapted and unadapted S. Enteritidis and affirms the contribution of Dps and CpxR in PA induced acid resistance.Salmonella enterica Serovar Enteritidis (S. Enteritidis) is a facultative intracellular pathogen responsible for acute gastroenteritis and is currently the second most frequently isolated serovar in the United States - accounting for nearly 15% of total cases of human salmonellosis [1]. S. Enteritidis maintains its status as a leading cause of foodborne infections mainly due to its prevalence in poultry products and its environmental persistence despite the harsh conditions it encounters. The survival of this pathogen under intense conditions has been linked to its remarkable ability to quickly respond to environmental signals and adapt to its surroundings, as well as the induction of specific stress responses during environmental adaptation [2-6].Throughout its infection cycle, S. Enteritidis encounters several distinctive environments including those rich in the short chain fatty acids (SCFAs) acetate, propionate (PA), and butyrate. PA is one of many SCFAs deemed acceptable for use in food preservation and is freque
Physiotherapy students’ perception on problem based learning
Thusharika D. Dissanayaka,Kosala N. Marambe,Esther Liyanage
Sri Lanka Journal of Bio-Medical Informatics , 2013, DOI: http://dx.doi.org/10.4038/sljbmi.v3i3.4787
Abstract: Objective: To assess the third year physiotherapy students’ perception of problem based learning sessions in Musculoskeletal physiotherapy.Design, setting and sample: Third year physiotherapy students in the department of Physiotherapy, Faculty of Allied Health Sciences, University of Peradeniya.Measurements: A 15 item, self-administered questionnaire with a five point Likert scale was used.Results: The response rate was 75% (24 out of 32). Seventy nine per cent of students agreed that it promotes critical thinking. A majority of students felt that, the PBL sessions were better at fulfilling learning objectives, gave better factual knowledge of musculoskeletal physiotherapy was enjoyable and ensured team work. Most of the students’ indicated that more such sessions should be organised in the future. The main disadvantage perceived was that it was time-consuming.Conclusion: The results of this study showed that, third year physiotherapy students’ perception of problem based learning sessions in musculoskeletal physiotherapy was positive. Thus it can be used as a teaching learning strategy.
State of the Art and Emerging Trends in Operations and Maintenance of Offshore Oil and Gas Production Facilities:Some Experiences and Observations

Jayantha P Liyanage Centre for Industrial Asset Management,University of Stavanger,Stavanger N-,Norway,

国际自动化与计算杂志 , 2010,
Abstract: Plant maintenance has been a discipline that has gradually evolved with the industrial revolution. For quite some time, it has been a ``necessary evil' in production, manufacturing, and process settings. The changing business needs and industrial conditions have had various impacts on the maintenance process, particularly over the last few years. While some industries have inherent difficulties seeing what maintenance is all about, others have begun to add more flavor to the organizational maintenance practices. This article brings an overview of developments within the offshore oil and gas production sector.
Immunohistochemical assessment of hormone receptor status of breast carcinoma : Interobserver variation of the quick score
Mudduwa Lakmini,Liyanage Thusharie
Indian Journal of Medical Sciences , 2009,
Abstract: Background: Immunohistochemical (IHC) assessment of estrogen receptor (ER) and progesterone receptor (PR) status has become a routine practice to predict the likely outcome of Tamoxifen therapy. Aims: To assess the interobserver variation in scoring hormone receptor status of breast carcinoma, using the Quick Score. Materials and Methods: IHC-stained slides of breast carcinomas reported by the two authors during a 28-month period were included in the study. Both authors independently reassessed all the tumors. Both were blinded to each other′s assessment. The Quick score with a 0-8 point scale was used to score the hormone receptor status. Weighted Kappa was calculated to assess the interobserver variation. Results: A total of 210 breast carcinomas were included in this study. There was a substantial to almost perfect agreement between the two observers in scoring the hormone receptor status (kappa values; ER = 0.856, PR = 0.711). Both ER and PR showed an almost perfect agreement in assessing the intensity of staining (kappa value; ER = 0.882, PR = 0.840), while the scoring of proportion of cells gave lower Kappa values (kappa value; ER = 0.778, PR = 0.592). Interobserver agreement was less in scoring hormone receptor status of breast carcinomas after mastectomies compared with excision biopsies, wide local excisions and metastatic deposits in lymph nodes. Suboptimal fixation resulting in background staining has contributed to the variation. Conclusion: A substantial to almost perfect interobserver agreement was seen in assigning an overall Quick score. Detection of complete negative and strong expression had a moderate to substantial agreement.
Behavior of Cu, Pb, and Zn in Ash during the Endothermic Burning of Mixed Industrial Wastes  [PDF]
Masafumi Tateda, Seisou Suzuki, Youngchul Kim, Bandunee Champika Liyanage Athapattu
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.25057
Abstract: The behaviors of Cu, Pb, and Zn during the endothermic burning of heterogeneous wastes were investigated using a variety of operational parameters, i.e., the mixed waste ratio, burning temperature, and burning time, to obtain fundamental knowledge to generate an optimal burning operation and recycling strategy for bottom ash. Changing these parameters had no impact on the Cu content of the ash, whereas the Pb content depended on the burning temperature and the mixed ratio, and the Zn content was affected by all three parameters. It was found in this study that the optimal burning conditions were a temperature of 1100?C, a time of 15 minutes, and either the current waste conditions or waste conditions with double the waste plastic and wood content.
Low serum vitamin D among community-dwelling healthy women in Sri Lanka  [PDF]
Mahinda Rodrigo, Manjula Hettiarachchi, Chandrani Liyanage, Sarath Lekamwasam
Health (Health) , 2013, DOI: 10.4236/health.2013.512270

Background: Although hypovitaminosis D is prevalent among healthy adults in Asia and other regions, available data among Sri Lankans are not consistent with this finding. We studied vitamin D level among healthy community-dwelling women and examined its effects on parathyroid hormone (PTH) level and bone mineral status. Methods: Females of 20-40 years (n = 434) who were employed in southern Sri Lanka were recruited to the study. Bone mineral density and content (pBMD and pBMC) of the middle phalanx of the middle finger of the non-dominant hand were measured in all subjects and 5.0 ml of venous blood was collected from each subject after an overnight fast for biochemical assessment of serum vitamin D, parathyroid hormone and total alkaline phosphatase. Results: Mean (SD) pBMD of the women studied was 0.493 (0.060) g/cm2 and pBMC was 1.49 (0.28) g. Severe vitamin D deficiency (<12.5 nmol/L) was seen in 21.4% of subjects, whereas 19.1% subjects had moderate (12.5-25.0 nmol/L) and 15.7% had mild (25.1 -35.0 nmol/L) vitamin D deficiency. Serum vitamin D showed significant positive correlations with pBMD (r = 0.13, p = 0.008) and pBMC (r = 0.12, p = 0.01). In regression analysis, vitamin D showed a positive association with pBMD (regression coefficient 0.0003, SEM 0.0001, p = 0.007). Conclusions: Vitamin D insufficiency/deficiency is prevalent among healthy young and middle-aged women in this study group selected from southern Sri Lanka. The accompanying rise of PTH indicates the biological significance of low vitamin D level. The negative effects observed on bone mineral status suggest the clinical importance of this finding.

Case Study: Finding Better Solutions for Municipal Solid Waste Management in a Semi Local Authority in Sri Lanka  [PDF]
Bandunee Champika Liyanage, Renuka Gurusinghe, Sunil Herat, Masafumi Tateda
Open Journal of Civil Engineering (OJCE) , 2015, DOI: 10.4236/ojce.2015.51007
Abstract: This case study investigates better and sustainable waste management for a given area in Sri Lanka. A questionnaire and field surveys were performed in a small local authority adjacent to Colombo, the capital city. Composting for organic waste and incineration for non-compostable waste were found to be important treatment methods for solid-waste management. The reduction of solid waste is a critical process for sustainable management. Currently, people in the area do not have much interest in waste recycling to decrease the cost of solid-waste management. It was therefore concluded that raising people’s awareness would play an important role in the reduction of solid waste. A suitable waste-management plan needs to be made for each community and area. The situation and conditions of every area is different, therefore each community needs to make an effort to find its own better and sustainable solid-waste management process.
An Assessment of the Contribution of an Analog Forest as a Sustainable Land-use Ecosystem for the Development of Rural Green Economy in Sri Lanka
W.K.D.D. Liyanage,N.S. Gamage,G.D.C Pushpa Kumara,L Xulong
Journal of Tropical Forestry and Environment , 2013,
Abstract: Large scale clearing of natural forests for human settlements as well as in the form of tea, rubberand cinnamon plantations resulted forest fragmentation in most natural ecosystems in the wet zone of SriLanka which posed massive threats to both nature and the humans including the loss of biodiversity,environmental hazards and increasing poverty. This paper discusses about the potential to develop ruralgreen economy as a result of consolidating these agricultural lands into analog forests as a sustainableland use practice. Bangamukande Estate, a man-made analog forest in Galle District was selected for thisassessment. Participatory rural appraisal methods were used to obtain information on resource utilizationby the local community in nearby villages. Secondary data of the long term analog forestry establishmentprogramme were also used for analysis the livelihood changes of the people due to the impacts thissystem. Various interventions had been made to address the issues such as encouraging local farmers tocultivate timber, fruits, spices and medicinal plants, paying them for the environmental services theyrender and enhancing their income through green employment. The introduction of new sustainableagricultural activities such as bee keeping and planting fruits resulted in the production of value addedfarm products and organic fruits to be sold in the market. Through environmental based tourism activitiessuch as providing food and accommodation, eco-guidance, and assisting environmental research, thestakeholders are earning a better income supporting the development of a green economy in the country.
The Aetiological Role of Human Papillomavirus in Oesophageal Squamous Cell Carcinoma: A Meta-Analysis
Surabhi S. Liyanage, Bayzidur Rahman, Iman Ridda, Anthony T. Newall, Sepehr N. Tabrizi, Suzanne M. Garland, Eva Segelov, Holly Seale, Philip J. Crowe, Aye Moa, C. Raina MacIntyre
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0069238
Abstract: Background The aetiological role of human papillomavirus (HPV) in oesophageal squamous cell carcinoma (OSCC) has been widely researched for more than three decades, with conflicting findings. In the absence of a large, adequately powered single case-control study, a meta-analysis of all available case-control studies is the most rigorous way of identifying any potential association between HPV and OSCC. We present the first global meta-analysis of case-control studies investigating the role of HPV in OSCC. Methods Case-control studies investigating OSCC tissue for presence of HPV DNA were identified. 21 case-control studies analyzing a total of 1223 cases and 1415 controls, met our inclusion criteria. HPV detection rates were tabulated for each study and all studies were assessed for quality. The random effects method was used to pool the odds ratios (OR). Results From all OSCC specimens included in this meta-analysis, 35% (426/1223) were positive for HPV DNA. The pooled OR for an HPV-OSCC association was 3.04 (95% CI 2.20 to 4.20). Meta-regression analysis did not find a significant association between OR and any of the quality domains. Influence analysis was non-significant for the effect of individual studies on the pooled estimate. Studies conducted in countries with low to medium OSCC incidence showed a stronger relationship (OR 4.65, 95% CI 2.47 to 8.76) than regions of high OSCC incidence (OR 2.65, 95% CI 1.80 to 3.91). Conclusions Uncertainty around the aetiological role of HPV in OSCC is due largely to the small number and scale of appropriately designed studies. Our meta-analysis of these studies suggests that HPV increases the risk of OSCC three-fold. This study provides the strongest evidence to date of an HPV-OSCC association. The importance of these findings is that prophylactic vaccination could be of public health benefit in prevention of OSCC in countries with high OSCC incidence.
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