2,692 research outputs found

    Screening for anti-methicillin resistant Staphylococcus aureus (MRSA) bacteriocin producing bacteria

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    Methicillin resistant bacterial infections give a tough challenge in the selection of antibiotics. Traditional use of antibiotics is worsening the problem day by day. So, it is essential to sort out other strategies which can replace antibiotic therapy successfully. Bacteriocins are the proteinaceous compounds with a narrower spectrum of antimicrobial activity but its use as antibiotic is not common. No one has ever tried to use it for the treatment of infections. Presently, we have isolated bacteriocin producing bacteria effective against methicillin resistant bacteria. It will help in controlling MRSA infections as well as provide a new strategy to treat reemerging infections

    Episodic accretion in binary protostars emerging from self-gravitating solar mass cores

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    Observations show a large spread in the luminosities of young protostars, which are frequently explained in the context of episodic accretion. We here test this scenario using numerical simulations following the collapse of a solar mass molecular cloud using the GRADSPH code, varying the strength of the initial perturbations and the temperature of the cores. A specific emphasis of this paper is to investigate the role of binaries and multiple systems in the context of episodic accretion, and to compare their evolution to the evolution in isolated fragments. Our models form a variety of low mass protostellar objects including single, binary and triple systems with binaries more active in exhibiting episodic accretion than isolated protostars. We also find a general decreasing trend for the average mass accretion rate over time, suggesting that the majority of the protostellar mass is accreted within the first 10^5 years. This result can potentially help to explain the surprisingly low average luminosities in the majority of the protostellar population.Comment: 16 pages, 13 figures, 4 tables. Accepted for publication with A&

    Value Focused Thinking for Nation Building in Afghanistan: A Regional Perspective

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    This thesis is an effort to mathematically model the nation building effort that is underway in Afghanistan. The thesis examines this nation building effort from the perspective of a local person who understands Afghan culture better than a foreigner. The thesis employs value-focused thinking to categorize the factors that we need to focus on for nation building in descending order of priority. This research adds a new dimension to the models already available in the literature and is likely to be more readily embraced by the local people who are sometimes in conflict with American priorities

    Reconciliation, Restoration and Reconstruction of a Conflict Ridden Country

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    Conflict has sadly been a constant part of history. Winning a conflict and making a lasting peace are often not the same thing. While a peace treaty ends a conflict and often dictates terms from the winners’ perspective, it may not create a lasting peace. Short of unconditional surrender, modern conflict ends with a negotiated cessation of hostilities. Such accords may have some initial reconstruction agreements, but Reconciliation, Restoration and Reconstruction (RRR) is a long term process. This study maintains that to achieve a lasting peace: 1) The culture and beliefs of the conflict nation must be continuously considered and 2) RRR is a long term effort which will occur over years not just in the immediate wake of signing a treaty or agreement. To assure the inclusion of all stakeholders and gain the best results in dealing with this “wicked problem”, an array of Operations Research techniques can be used to support the long term planning and execution of a RRR effort. The final decisions will always be political, but the analysis provided by an OR support team will guide the decision makers to better execute consensus decisions that consider all stakeholder needs. The development of the value hierarchy framework in this dissertation is a keystone of building a rational OR supported long term plan for a successful RRR. The primary aim of the research is to propose a framework and associated set of guidelines derived from appropriate techniques of OR, Decision Analysis and Project Management (right from development of a consensus based value hierarchy to its implementation, feedback and steering corrections) that may be applied to help RRR efforts in any conflict ridden country across the globe. The framework is applicable to any conflict ridden country after incorporating changes particular to any country witnessing a prolonged conflict

    Phenotypic and Molecular Characterization of Plasmid- Encoded Extended Spectrum Beta-Lactamases Produced by Escherichia coli and Klebsiella spp from Lahore, Pakistan

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    Purpose: To investigate the distribution of plasmid-encoded extended spectrum beta-lacatamases (ESBLs) in Lahore, Pakistan using different phenotypic and molecular methods.Methods: Escherichia coli and Klebsiella spp were obtained over a period of nineteen months (June 2007 to December 2008). Both were tested by the double disk synergy test, combined disk test and  Epsiometer-test (E-test) to evaluate their ability to detect ESBLs. The genotypes of ESBLs were analyzed by monoplex polymerase chain reaction (PCR), multiplex PCR, DNA sequencing and isoelectric focusing.Results: 662 E. coli and 153 Klebsiella spp were analyzed. Among these isolates, 39.3 % E. coli and 26.1 % Klebsiella spp were positive for extended spectrum beta-lactamases (ESBLs).71.9 % E. coli and 79.6 % Klebsiella spp showed minimum inhibitory concentration (MIC) in the range > 32/0.064 = 500 μl/mL for cetatzidime/cetatzidime + clavulanic acid, while 66.5 % E. coli and 69.1 % Klebsiella spp revealed MIC in the range of > 16/0.016 = 1000 μl/mL for cefotaxime/cefotaxime + clavulanic acid. Antibiotic susceptibility testing revealed that imipemem, meropenem and tazocine were the most effective in the management of such infections. The most frequent genotype of ESBL was OXA (19.2 %) for E. coli and SHV (92.5 %) for Klebsiella spp. The highest genotypic combination found was the combination of TEM/OXA (44.2 %) for E. coli.Conclusion: The resistance of E. coli and Klebsiella spp-producing ESBLs in Pakistan is a serious issue, and TEM, OXA and SHV type ESBL were the most common genotypes. Some isolates produced two or three genotypes at a time. Multiplex PCR of ESBL may help in early detection as well as phenotypic antibiotic therapy of these infections.Keywords: Beta-lactamases, Escherichia coli, Klebsiella spp, Antibiotic susceptibility,  Plasmidencoded, Structural genes, Imipemem, Meropenem, Tazocin

    6G Vision: Towards Future Collaborative Cognitive Communication (3C) Systems

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    6G networks are expected to have a breakthrough by enabling the emergence of collaborative cognitive communication services over heterogeneous environments for industry 5.0 applications. These applications are required to adapt human-centric approach to make the most of human intuition and intelligence in Industry 4.0 automation.It calls for a transdisciplinarity research domain to investigate innovative systems with overlapping realms of Psychology, Sociology, Communication networks, Artificial Intelligence , Natural Language Processing and Collaborative Computing. The author at the Cognitive Systems Research Centre, London South Bank University has coined the expression “3C Systems" to refer to such artifacts which stands for "Collaborative Cognitive Communication Systems”. In this paper, an innovative framework for 3C Systems is proposed that is able to analyze and predict both the human as well as machine behaviors. It proactively diagnoses issues and recommends solutions without requiring any human intervention. The proposed concept of 3C Systems would potentially contribute towards 6G standardization. The automation and orchestration aspects of this research have variety of applications stretched across city infrastructures, retail, business, tourism, health, law, education and travel. A thorough insight to a broad view of 6G vision has been presented towards envisioned 3C Systems, while covering its enabling technologies. The experimental results for the proof of concept implementation has been presented. Results affirm the technical capabilities of the concept, to contribute to several industry 5.0 applications including, but not limited to holographic communication, self-driving vehicles, context-aware infrastructure and personalized interfaces
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