An Analysis of Accuracy using Logistic Regression and Time Series

This paper analyzes the accuracy rates for logistic regression and time series models. It also examines a relatively new performance index that takes into consideration the business assumptions of credit markets. Although prior research has focused on evaluation metrics, such as AUC and Gini index, this new measure has a more intuitive interpretation for various managers and decision makers and can be applied to both Logistic and Time Series models

Achieving value for money in facilities management

The topic of this dissertation is "achieving value for money in facilities management: case studies of housing performance management in two Local Authorities". The author of this dissertation is Lord Baidoo. The dissertation investigates how the partnership arrangement between the management organisations and the FM services providers can be exploited to increase the capacity to improve value for money. This dissertation also finds out whether BSC is an effective performance measurement system in to help maximise the opportunities to deliver value for money in a comprehensive and co-ordinated way. The literature review provides an overview of performance measurement within Local Authorities, examined and position the concept of VFM in facilities management setting. Identified and analysed the strategic importance of the BSC and some of the drawbacks as a performance measurement system. Finally the literature review provides an outlook to the different procurement models in organising Local Authorities facilities services. The dissertation used balanced scorecard as the research framework to help identify the major differences and challenges in housing performance management between a three stars and one star Councils in the achievement of value for money of FM services. The BSC key comparatives performance indicators used include customer perspective, internal process perspective, financial perspective and learning and growth perspective. In this dissertation, two case studies were discussed. Results from the studies were presented graphically. Descriptive method was used to analyse the results of the case study questionnaires. The dissertation concluded that BSC is necessary because it addressed a number of issues central to best value, identified areas where best value has not being delivered and tells whether or not value for money has been achieve through the four perspectives whilst value chain only tells whether or not an optimum balance between the 3F/s has been achieved but does point out areas in performance measurement that needs action. While this study is based on case study approach and the results cannot be generalised without a degree of caution, the study proposes ten recommendations for implementation for one star Councils and their FM service providers. A further research into how balanced scorecard can be use effectively as a practical tool in managing Local Authority's housing performance was also recommended

Community acceptance of COVID-19 and demystifying stigma in a severely affected population in Ghana

Objective: We assessed the level of community acceptance of COVID-19, identified and implemented strategies to demystifying stigma in a severely affected population in Tema.Design and Setting: We conducted a cross-sectional study to assess stigma among the Tema community, then identified and implemented interventions to demystify COVID-19 stigma. We interviewed positive cases, their contacts, contact tracers, case management team members, and community members who shared their first hand experiences and knowledge on the current pandemic.Intervention: Based on the information received, we came up with ways of reducing stigma and implemented them in their community.Main Outcome: Stigma demystifiedResults: Cases and contacts reported being avoided, discriminated against, insulted or had derogatory words used on them by family, friends, work colleagues or the community. Cases and their contacts stated that stigmatisation was fueled by the presence of COVID -19 branded vehicles and security officials at their homes or workplaces. Stakeholder engagement, education and extensive sensitisation of community members were implemented to reduce stigma.Conclusion: We observed deeply entrenched stigma to COVID - 19 positive patients and their contacts in the community. Health care response mechanisms such as the presence of security personnel with contact tracers and case managers and the use of COVID -19 branded vehicles fueled stigma. A multifaceted approach through the engagement of key stakeholders, training of health workers and extensive education and community sensitisation was essential in reducing stigma

Functional responses of methanogenic archaea to syntrophic growth.

Methanococcus maripaludis grown syntrophically with Desulfovibrio vulgaris was compared with M. maripaludis monocultures grown under hydrogen limitation using transcriptional, proteomic and metabolite analyses. These measurements indicate a decrease in transcript abundance for energy-consuming biosynthetic functions in syntrophically grown M. maripaludis, with an increase in transcript abundance for genes involved in the energy-generating central pathway for methanogenesis. Compared with growth in monoculture under hydrogen limitation, the response of paralogous genes, such as those coding for hydrogenases, often diverged, with transcripts of one variant increasing in relative abundance, whereas the other was little changed or significantly decreased in abundance. A common theme was an apparent increase in transcripts for functions using H(2) directly as reductant, versus those using the reduced deazaflavin (coenzyme F(420)). The greater importance of direct reduction by H(2) was supported by improved syntrophic growth of a deletion mutant in an F(420)-dependent dehydrogenase of M. maripaludis. These data suggest that paralogous genes enable the methanogen to adapt to changing substrate availability, sustaining it under environmental conditions that are often near the thermodynamic threshold for growth. Additionally, the discovery of interspecies alanine transfer adds another metabolic dimension to this environmentally relevant mutualism

Utility of early diagnosis, contact tracing and stakeholder engagement in outbreak response in three COVID-19 outbreak settings in Ghana

Objective: To describe how early case detection, testing and contact tracing measures were deployed by stakeholders in response to the COVID-19 outbreak in Ghana – using three outbreak scenarios.Design: A descriptive assessment of three case studies of COVID-19 outbreaks within three settings that occurred in Ghana from March 13 till the end of June 2020.Setting: A construction camp, a factory and a training institution in Ghana.Participants: Staff of a construction camp, a factory, workers and students of a training institution.Interventions: We described and compared the three COVID-19 outbreak scenarios in Ghana, highlighting identification and diagnosis of cases, testing, contact tracing and stakeholder engagement for each scenario. We also outlined the challenges and lessons learnt in the management of these scenarios.Main outcome measures: Approach used for diagnosis, testing, contact tracing and stakeholder engagement.Results: Index cases of the training institution and construction camp were screened the same day of reporting symptoms, whiles the factory index case required a second visit before the screening. All index cases were tested with RTPCR. The training institution followed and tested all contacts, and an enhanced contact tracing approach was conducted for staff of the other two sites. Multi-sectorial engagement and collaboration with stakeholders enabled effectivehandling of the outbreak response in all sites.Conclusion: Comparing all three settings, early diagnosis and prompt actions taken through multi-sectorial collaborations played a major role in controlling the outbreak. Engaging stakeholders in the COVID-19 response is an effective way to mitigate the challenges in responding to the pandemic

Up-regulation of GITRL on dendritic cells by WGP improves anti-tumor immunity in murine Lewis lung carcinoma

Background β-Glucans have been shown to function as a potent immunomodulator to stimulate innate and adaptive immune responses, which contributes to their anti-tumor property. However, their mechanisms of action are still elusive. Glucocorticoid-induced TNF receptor ligand (GITRL), a member of the TNF superfamily, binds to its receptor, GITR, on both effector and regulatory T cells, generates a positive co-stimulatory signal implicated in a wide range of T cell functions, which is important for the development of immune responses. Methodology/Principal Findings In this study, we found that whole β-glucan particles (WGPs) could activate dendritic cells (DCs) via dectin-1 receptor, and increase the expression of GITRL on DCs in vitro and in vivo. Furthermore, we demonstrated that the increased GITRL on DCs could impair the regulartory T cell (Treg)-mediated suppression and enhance effector T cell proliferation in a GITR/GITRL dependent way. In tumor models, DCs with high levels of GITRL were of great potential to prime cytotoxic T lymphocyte (CTL) responses and down-regulate the suppressive activity of Treg cells, thereby leading to the delayed tumor progression. Conclusions/Significance These findings suggest that particulate β-glucans can be used as an immunomodulator to stimulate potent T cell-mediated adaptive immunity while down-regulate suppressive immune activity via GITR/GITRL interaction, leading to a more efficient defense mechanism against tumor development.published_or_final_versio

Mutations in Escherichia coli aceE and ribB genes allow survival of strains defective in the first step of the isoprenoid biosynthesis pathway

A functional 2-C-methyl-D-erythritol 4-phosphate (MEP) pathway is required for isoprenoid biosynthesis and hence survival in Escherichia coli and most other bacteria. In the first two steps of the pathway, MEP is produced from the central metabolic intermediates pyruvate and glyceraldehyde 3-phosphate via 1-deoxy-D-xylulose 5-phosphate (DXP) by the activity of the enzymes DXP synthase (DXS) and DXP reductoisomerase (DXR). Because the MEP pathway is absent from humans, it was proposed as a promising new target to develop new antibiotics. However, the lethal phenotype caused by the deletion of DXS or DXR was found to be suppressed with a relatively high efficiency by unidentified mutations. Here we report that several mutations in the unrelated genes aceE and ribB rescue growth of DXS-defective mutants because the encoded enzymes allowed the production of sufficient DXP in vivo. Together, this work unveils the diversity of mechanisms that can evolve in bacteria to circumvent a blockage of the first step of the MEP pathway

A microbial supply chain for production of the anti-cancer drug vinblastine

International audienceAbstract Monoterpene indole alkaloids (MIAs) are a diverse family of complex plant secondary metabolites with many medicinal properties, including the essential anti-cancer therapeutics vinblastine and vincristine 1 . As MIAs are difficult to chemically synthesize, the world’s supply chain for vinblastine relies on low-yielding extraction and purification of the precursors vindoline and catharanthine from the plant Catharanthus roseus , which is then followed by simple in vitro chemical coupling and reduction to form vinblastine at an industrial scale 2,3 . Here, we demonstrate the de novo microbial biosynthesis of vindoline and catharanthine using a highly engineered yeast, and in vitro chemical coupling to vinblastine. The study showcases a very long biosynthetic pathway refactored into a microbial cell factory, including 30 enzymatic steps beyond the yeast native metabolites geranyl pyrophosphate and tryptophan to catharanthine and vindoline. In total, 56 genetic edits were performed, including expression of 34 heterologous genes from plants, as well as deletions, knock-downs and overexpression of ten yeast genes to improve precursor supplies towards de novo production of catharanthine and vindoline, from which semisynthesis to vinblastine occurs. As the vinblastine pathway is one of the longest MIA biosynthetic pathways, this study positions yeast as a scalable platform to produce more than 3,000 natural MIAs and a virtually infinite number of new-to-nature analogues