1,259 research outputs found

    Role of Environmental Sustainability, Psychological and Managerial Supports for Determining Bankers Green Banking Usage Behavior: An Integrated Framework '

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    PURPOSE: Green banking, an ethical banking concept, concentrates on environmental protection and encourages social and environmental sustainability, perceived cognitive efforts, and subjective norms ensuring ecologically responsive banking services. Consequently, although there have been considerable green banking attempts in Bangladesh, it is yet unknown how environmental sustainability, perceived cognitive effort, and subjective norms affect usage behavior. The present research aims to uncover this gap, extending the Theory of Reasoned Action (TRA) to examine the determinants of the bankers’ green banking usage behavior during COVID-19. METHODS: Data were collected from 366 bankers in Bangladesh using a purposive sampling technique and analyzed with structural equation modeling (SEM) using SMART PLS 3 software. FINDINGS: The study found management support (0.291, t-statistics = 1.978, p 0.000), environmental sustainability (β = 0.278, t-statistics = 2.752, p < 0.001), perceived cognitive efforts (β = 0.401, t-statistics = 3.549, p < 0.000), and subjective norms (β = 0.309, t-statistics = 4.352, p < 0.000) influence bankers’ attitudes. Whereas environmental sustainability (β = 0.503, t-statistics = 3.726, p < 0.001), perceived cognitive efforts (β = 0.103, t-statistics = 2.020, p < 0.002), subjective norms (β = 0.281, t-statistics = 4.607, p < 0.000), and attitudes (= 0.602, t-statistics = 5.523, p 0.015) influence bankers’ green banking usage behavior. Finally, the mediating role of management supports, environmental sustainability, cognitive efforts and subjective norms on green banking usage behavior through attitudes was significant. CONTRIBUTION/CONCLUSION: The study contributed to existing literature validating the proposed holistic framework applying TRA and three contemporary dimensions explaining bankers’ behavior toward green banking practice. Finally, the implementers should focus on green banking practices as green banking is one of the key strategies to protect the environment, assure social justice, and create economic success

    Tagging Scientific Publications using Wikipedia and Natural Language Processing Tools. Comparison on the ArXiv Dataset

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    In this work, we compare two simple methods of tagging scientific publications with labels reflecting their content. As a first source of labels Wikipedia is employed, second label set is constructed from the noun phrases occurring in the analyzed corpus. We examine the statistical properties and the effectiveness of both approaches on the dataset consisting of abstracts from 0.7 million of scientific documents deposited in the ArXiv preprint collection. We believe that obtained tags can be later on applied as useful document features in various machine learning tasks (document similarity, clustering, topic modelling, etc.)

    Bisphenol A Detection in Various Brands of Drinking Bottled Water in Riyadh, Saudi Arabia Using Gas Chromatography/Mass Spectrometer

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    Purpose: To assess whether bisphenol A contamination occurred in seven brands of bottled drinking water in Riyadh, Saudi Arabia.Methods: Liquid-liquid extraction (using dichloromethane) was used to analytically extract bisphenol A from drinking water bottles and a gas chromatograph-mass spectrometer was employed for its detection using a splitless capillary column and helium as the carrier gas.Results: The concentration of bisphenol A (BPA) was high in all the bottled water brands tested. The mean concentration of BPA of the bottled water stored indoors (4.03 ng/L) was significantly lower than that stored outdoors (7.5 ng/L).Conclusion: Our results show that significant amounts of BPA leached from bottle containers into the water. Long storage of bottled water under direct sunlight should be avoided to reduce the risk of human exposure to BPA

    Physical mapping of a powdery mildew resistance related gene Hv-S/TPK by FISH with a TAC clone in wheat

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    Dissertação de mestrado integrado em Medicina (Hematologia), apresentado á Faculdade de Medicina da Universidade de Coimbra.A Policitemia Vera (PV) é uma doença clonal de etiologia desconhecida, na maior parte dos casos, que envolve a célula estaminal progenitora hematopoiética multipotencial. É uma neoplasia mieloproliferativa crónica (NMP) que se caracteriza pela expansão das três linhas celulares hematopoiéticas: eritróide, granulocítica e megacariocítica, com predomínio da primeira, de modo independente dos mecanismos normais de regulação da eritropoiese. Além disso, as células têm aspecto morfológico normal, a fibrose medular é pouco significativa e os níveis de eritropoietina (Epo) são habitualmente normais a baixos. Além da hipercelularidade medular com sobreprodução de uma ou de todas as linhas celulares, a doença cursa com hematopoiese extramedular, hiperviscosidade, propensão para complicações como trombose ou hemorragia e risco de desenvolvimento de mielofibrose ou transformação em leucemia aguda. A descrição relativamente recente da associação de uma mutação no gene JAK2, localizado no cromosoma 9p24, com as doenças mieloproliferativas clássicas negativas para BCR-ABL, como a PV, veio permitir avanços significativos na compreensão da patofisiologia deste grupo de doenças hematológicas. A mutação provoca uma alteração do aminoácido V (valina) para F (fenilalanina) na posição 617 (JAK2V617F). De acordo com os dados publicados, a frequência da detecção da mutação JAK2V617F em doentes com PV é de cerca de 95%. A proteína JAK2 é uma tirosina cinase citoplasmática, que se encontra associada ao domínio intracelular dos receptores de citocinas (como a Epo e trombopoietina - Tpo), e de factores de crescimento, essenciais para a função destes receptores. A mutação da JAK2 conduz à activação constitutiva dos receptores, independente da ligação à respectiva citocina e/ou hipersensibilidade a factores de crescimento, com consequente activação de múltiplas vias de sinalização intracelulares como a JAK/STAT (Janus Kinase/Signal Transductor and activator of transcription), a PI3K (fosfatidilinositol 3 cinase) e a MAPK (proteína cinase activadora de mitose), envolvidas na transformação e proliferação dos progenitores hematopoiéticos. Por outro lado, as células evidenciam alteração na diferenciação terminal e resistência à apoptose in vitro que poderá estar relacionada com o aumento da expressão da proteína anti-apoptótica Bcl-XL. Além dos avanços no diagnóstico, a detecção da mutação JAK2V617F tem contribuido para melhorar a classificação e a terapêutica dos doentes com PV. Deste modo, o conhecimento dos mecanismos moleculares envolvidos na PV tem levado os investigadores à descoberta de novos fármacos dirigidos ao defeito molecular, permitindo novas abordagem terapêuticas mais eficazes e provavelmente de menor toxicidade. Este trabalho procura fazer uma revisão sobre o actual conhecimento da caracterização molecular e clínica da PV e quais as suas implicações no diagnóstico e abordagem terapêutica desta NMP.Polycythemia Vera (PV) is a clonal disease of unknown etiology, which often involves the pluripotential hematopoietic stem cell. This disease integrates the family of chronic myeloproliferative neoplasm (MPN) and is characterized by the growth of the three hematopoietic celular lineages: granulocytic, megakaryocytic and erythroid, with predominance of the last one and regardless the normal mechanisms of erythropoiesis regulation. Moreover, cells have normal morphological aspect, bone marrow shows slight fibrosis and the levels of erythropoietin (Epo) usually vary from normal to low. Besides marrow hypercellularity with overproduction of one or all the celular lineages, the disease courses with extramedullary hematopoiesis, hyperviscosity, leading to complications such as thrombosis or bleeding and risk of transformation to myelofibrosis or acute leukemia. Recently it has been described the association between the mutation in the JAK2 gene, located on chromosome 9p24, with the classic myeloproliferative disorders BCR-ABL negative, such as PV, which has brought significant advances in the understanding of the pathophysiology of this group of hematologic malignancies. The mutation causes a change of amino acid V (valine) to F (phenylalanine) at position 617 (JAK2V617F). According to published data, the frequency of JAK2V617F mutation detected in patients with PV is about 95%. JAK2 protein is a cytoplasmic tyrosine kinase, which is associated to the intracelular domain of cytokine receptors, such as Epo and thrombopoietin (Tpo), and growth factors which are essential to the function of these receptors. JAK2 mutation leads to the constitutive receptors activation, independent of connection to their cytokine and / or hypersensitivity to growth factors, with consequent activation of multiple intracellular signaling pathways such as JAK / STAT (Janus Kinase / Signal transducer and transcription activator), the PI3K (phosphatidylinositol 3 kinase) and MAPK (Mitogen-activated protein), involved in the transformation and proliferation of hematopoietic progenitors. Moreover, the cells show changes in terminal differentiation and resistance to in vitro apoptosis which is possibly related to the increasing expression of anti-apoptotic protein Bcl-XL. In addition to the advances in diagnosis, detection of JAK2V617F mutation has contributed to the improvement of classification and treatment in patients with PV. Thus, knowledge of the molecular mechanisms involved in PV has led investigators to the discovery of new drugs targeting molecular defects, allowing new therapeutic approach more efficient and probably less toxic. The aim of this article is to review the current knowledge of clinical and molecular characterization of PV, and its implications on the diagnosis and therapeutic approach of this myeloproliferative disorder

    A new accuracy measure based on bounded relative error for time series forecasting

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    Many accuracy measures have been proposed in the past for time series forecasting comparisons. However, many of these measures suffer from one or more issues such as poor resistance to outliers and scale dependence. In this paper, while summarising commonly used accuracy measures, a special review is made on the symmetric mean absolute percentage error. Moreover, a new accuracy measure called the Unscaled Mean Bounded Relative Absolute Error (UMBRAE), which combines the best features of various alternative measures, is proposed to address the common issues of existing measures. A comparative evaluation on the proposed and related measures has been made with both synthetic and real-world data. The results indicate that the proposed measure, with user selectable benchmark, performs as well as or better than other measures on selected criteria. Though it has been commonly accepted that there is no single best accuracy measure, we suggest that UMBRAE could be a good choice to evaluate forecasting methods, especially for cases where measures based on geometric mean of relative errors, such as the geometric mean relative absolute error, are preferred

    Spherical indentation method for estimating equibiaxial residual stress and elastic-plastic properties of metals simultaneously

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    For instrumented spherical indentation, the presence of equibiaxial residual stress in a material will lead the indentation load-depth curve to shift upward or downward. The load differences between the stressed and stress-free curves were used to estimate the equibiaxial residual stress. Using dimensional analysis and finite element simulations, the equibiaxial residual stress was related to the elastic-plastic parameters and the relative load difference at a fixed normalized indentation depth (h/R = 0.1). Based on these expressions, and together with the method for determining elastic-plastic parameters established in our previous work, an integrated method was proposed to estimate the equibiaxial residual stress and elastic-plastic parameters of metals simultaneously via instrumented spherical indentation. This method avoids preknowledge of the yield strength and measuring the contact area. Applications were illustrated on Al 2024, Al 7075, and Ti Grade 5 with introduced stresses. By comparing the results determined by this integrated method with the reference values, the maximum relative error is generally within +/- 10% for the yield strength, within +/- 15% for the elastic modulus, and within +/- 20% for the equibiaxial</p

    Dissecting Genetic Networks Underlying Complex Phenotypes: The Theoretical Framework

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    Great progress has been made in genetic dissection of quantitative trait variation during the past two decades, but many studies still reveal only a small fraction of quantitative trait loci (QTLs), and epistasis remains elusive. We integrate contemporary knowledge of signal transduction pathways with principles of quantitative and population genetics to characterize genetic networks underlying complex traits, using a model founded upon one-way functional dependency of downstream genes on upstream regulators (the principle of hierarchy) and mutual functional dependency among related genes (functional genetic units, FGU). Both simulated and real data suggest that complementary epistasis contributes greatly to quantitative trait variation, and obscures the phenotypic effects of many ‘downstream’ loci in pathways. The mathematical relationships between the main effects and epistatic effects of genes acting at different levels of signaling pathways were established using the quantitative and population genetic parameters. Both loss of function and “co-adapted” gene complexes formed by multiple alleles with differentiated functions (effects) are predicted to be frequent types of allelic diversity at loci that contribute to the genetic variation of complex traits in populations. Downstream FGUs appear to be more vulnerable to loss of function than their upstream regulators, but this vulnerability is apparently compensated by different FGUs of similar functions. Other predictions from the model may account for puzzling results regarding responses to selection, genotype by environment interaction, and the genetic basis of heterosis

    Using molecular data for epidemiological inference: assessing the prevalence of Trypanosoma brucei rhodesiense in Tsetse in Serengeti, Tanzania

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    Background: Measuring the prevalence of transmissible Trypanosoma brucei rhodesiense in tsetse populations is essential for understanding transmission dynamics, assessing human disease risk and monitoring spatio-temporal trends and the impact of control interventions. Although an important epidemiological variable, identifying flies which carry transmissible infections is difficult, with challenges including low prevalence, presence of other trypanosome species in the same fly, and concurrent detection of immature non-transmissible infections. Diagnostic tests to measure the prevalence of T. b. rhodesiense in tsetse are applied and interpreted inconsistently, and discrepancies between studies suggest this value is not consistently estimated even to within an order of magnitude. Methodology/Principal Findings: Three approaches were used to estimate the prevalence of transmissible Trypanosoma brucei s.l. and T. b. rhodesiense in Glossina swynnertoni and G. pallidipes in Serengeti National Park, Tanzania: (i) dissection/microscopy; (ii) PCR on infected tsetse midguts; and (iii) inference from a mathematical model. Using dissection/microscopy the prevalence of transmissible T. brucei s.l. was 0% (95% CI 0–0.085) for G. swynnertoni and 0% (0–0.18) G. pallidipes; using PCR the prevalence of transmissible T. b. rhodesiense was 0.010% (0–0.054) and 0.0089% (0–0.059) respectively, and by model inference 0.0064% and 0.00085% respectively. Conclusions/Significance: The zero prevalence result by dissection/microscopy (likely really greater than zero given the results of other approaches) is not unusual by this technique, often ascribed to poor sensitivity. The application of additional techniques confirmed the very low prevalence of T. brucei suggesting the zero prevalence result was attributable to insufficient sample size (despite examination of 6000 tsetse). Given the prohibitively high sample sizes required to obtain meaningful results by dissection/microscopy, PCR-based approaches offer the current best option for assessing trypanosome prevalence in tsetse but inconsistencies in relating PCR results to transmissibility highlight the need for a consensus approach to generate meaningful and comparable data

    Transcription of toll-like receptors 2, 3, 4 and 9, FoxP3 and Th17 cytokines in a susceptible experimental model of canine Leishmania infantum infection

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    Canine leishmaniosis (CanL) due to Leishmania infantum is a chronic zoonotic systemic disease resulting from complex interactions between protozoa and the canine immune system. Toll-like receptors (TLRs) are essential components of the innate immune system and facilitate the early detection of many infections. However, the role of TLRs in CanL remains unknown and information describing TLR transcription during infection is extremely scarce. The aim of this research project was to investigate the impact of L. infantum infection on canine TLR transcription using a susceptible model. The objectives of this study were to evaluate transcription of TLRs 2, 3, 4 and 9 by means of quantitative reverse transcription polymerase chain reaction (qRT-PCR) in skin, spleen, lymph node and liver in the presence or absence of experimental L. infantum infection in Beagle dogs. These findings were compared with clinical and serological data, parasite densities in infected tissues and transcription of IL-17, IL-22 and FoxP3 in different tissues in non-infected dogs (n = 10), and at six months (n = 24) and 15 months (n = 7) post infection. Results revealed significant down regulation of transcription with disease progression in lymph node samples for TLR3, TLR4, TLR9, IL-17, IL-22 and FoxP3. In spleen samples, significant down regulation of transcription was seen in TLR4 and IL-22 when both infected groups were compared with controls. In liver samples, down regulation of transcription was evident with disease progression for IL-22. In the skin, upregulation was seen only for TLR9 and FoxP3 in the early stages of infection. Subtle changes or down regulation in TLR transcription, Th17 cytokines and FoxP3 are indicative of the silent establishment of infection that Leishmania is renowned for. These observations provide new insights about TLR transcription, Th17 cytokines and Foxp3 in the liver, spleen, lymph node and skin in CanL and highlight possible markers of disease susceptibility in this model
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