Effects of diamagnetic levitation on bacterial growth in liquid

Diamagnetic levitation is a technique that uses a strong, spatially-varying magnetic field to levitate diamagnetic materials, such as water and biological cells. This technique has the potential to simulate aspects of weightlessness, on the Earth. In common with all ground-based techniques to simulate weightlessness, however, there are effects introduced by diamagnetic levitation that are not present in space. Since there have been few studies that systematically investigate these differences, diamagnetic levitation is not yet being fully exploited. For the first time, we critically assess the effect of diamagnetic levitation on a bacterial culture in liquid. We used a superconducting magnet to levitate growing bacterial cultures for up to 18 hours, in a series of experiments to determine the effect of diamagnetic levitation on all phases of the bacterial growth cycle. We find that diamagnetic levitation increases the rate of population growth in a liquid culture. The speed of sedimentation of the bacterial cells to the bottom of the container is considerably reduced. Further experiments and microarray gene analysis show that the growth enhancement is due to greater oxygen availability in the magnetically levitated sample. We demonstrate that the magnetic field that levitates the cells also induces convective stirring in the liquid, an effect not present in microgravity. We present a simple theoretical model, showing how the paramagnetic force on dissolved oxygen can cause the liquid to become unstable to convection when the consumption of oxygen by the bacteria generates an oxygen concentration gradient. We propose that this convection enhances oxygen availability by transporting oxygen around the sample. Since convection is absent in space, these results are of significant importance and timeliness to researchers considering using diamagnetic levitation to explore weightless effects on living organisms and a broad range of other topics in the physical and life sciences

Effectiveness of a simple lymphoedema treatment regimen in podoconiosis management in southern Ethiopia: one year follow-up

Background: Podoconiosis is a non-filarial elephantiasis caused by long-term barefoot exposure to volcanic soils in endemic areas. Irritant silicate particles penetrate the skin, causing a progressive, debilitating lymphoedema of the lower leg, often starting in the second decade of life. A simple patient-led treatment approach appropriate for resource poor settings has been developed, comprising (1) education on aetiology and prevention of podoconiosis, (2) foot hygiene (daily washing with soap, water and an antiseptic), (3) the regular use of emollient, (4) elevation of the limb at night, and (5) emphasis on the consistent use of shoes and socks. Methodology/Principal Findings: We did a 12-month, non-comparative, longitudinal evaluation of 33 patients newly presenting to one clinic site of a non-government organization (the Mossy Foot Treatment & Prevention Association, MFTPA) in southern Ethiopia. Outcome measures used for the monitoring of disease progress were (1) the clinical staging system for podoconiosis, and (2) the Amharic Dermatology Life Quality Index (DLQI), both of which have been recently validated for use in this setting. Digital photographs were also taken at each visit. Twenty-seven patients completed follow up. Characteristics of patients completing follow-up were not significantly different to those not. Mean clinical stage and lower leg circumference decreased significantly (mean difference -0.67 (95% CI -0.38 to -0.96) and -2.00 (95% CI -1.26 to -2.74), respectively, p<0.001 for both changes). Mean DLQI diminished from 21 (out of a maximum of 30) to 6 (p<0.001). There was a non-significant change in proportion of patients with mossy lesions (p = 0.375). Conclusions/Significance: This simple, resource-appropriate regimen has a considerable impact both on clinical progression and self-reported quality of life of affected individuals. The regimen appears ideal for scaling up to other endemic regions in Ethiopia and internationally. We recommend that further research in the area include analysis of cost-effectiveness of the regimen

Improving mesothelioma follow-up care in the UK: A qualitative study to build a multidisciplinary pyramid of care approach

Objectives. The findings reported in this manuscript are part of a wider study that aimed to explore mesothelioma patients’ experiences of follow-up care. The aim of this phase of the study was to co-produce recommendations for policy and practice and to propose a revised, patient-focused, mesothelioma follow-up care service. Design. The consultation phase was qualitative and consisted of three group discussions with separate stakeholder groups allowing for different priorities and needs for follow-up care to be compared. An implicit approach to consensus was adopted and data were analysed iteratively using the framework method. Setting. The study was conducted in three National Health Service Trusts in the South of England. Two were secondary care settings and the third was a tertiary centre. Participants. The consultation exercise comprised three group discussions with key stakeholders (n=35): mesothelioma specialist nurses (n=9), mesothelioma patients and carers (n=11) and local clinical commissioning group members (n=15). Results. Recommendations for mesothelioma follow-up care were developed using a co-production approach and highlighted the importance of continuity of care, the provision of timely information and the central role played by mesothelioma specialist nurses, supported by the wider multidisciplinary team. Recommendations were produced together with two bespoke infographics to maximise impact and facilitate patient and public engagement with the study. Conclusions. The recommendations developed are the first that specifically examine best practice for the follow-up care pathway for mesothelioma patients. Co-production and public engagement are crucial to priority setting develop and optimising patient-centred care. Combining the recommendations produced with a targeted dissemination strategy and well-designed, patient-focused infographics will maximise opportunities for impact at a regional and national level

Building and Testing of an Adaptive Optics System for Optical Microscopy

Adaptive optics (AO), as the technology of compensating the wavefront distortion can significantly improve the performance of existing optical systems. An adaptive optics system is used to correct the wavefront distortion caused by the imperfection of optical elements and environment. It was originally developed for military and astronomy applications to mitigate the adverse effect of wavefront distortions caused by Earthâs atmosphere turbulence. With a closed-loop AO system, distortions caused by the environment can be reduced dramatically. As the technology matures, AO systems can be integrated into a wide variety of optical systems to improve their performance. The goal of this project is to build such an AO system which can be integrated into high-resolution optical microscopy. A Thorlabs Adaptive Optics Kit was set up. A Shack-Hartmann Wavefront sensor, a Deformable Mirror and other necessary optics hardware was combined together on a breadboard, and the control software was also implemented to form the feedback loop.https://ecommons.udayton.edu/stander_posters/1183/thumbnail.jp

Recommendations for improving follow-up care for mesothelioma patients: A qualitative study comprising documentary analysis, interviews and consultation meetings

Objectives. The study aim was to explore experiences of patients with pleural mesothelioma of follow-up care in three National Health Service (NHS) Trusts to develop recommendations for practice. Design. The study design was qualitative and comprised three interlinked phases: a documentary analysis, interviews and consultation meetings. Altheide and Johnson’s Analytic Realism theoretical framework guided the thematic data analysis process. Setting. The study was conducted in three NHS Trusts in South England. Two were secondary care settings and the third was a tertiary centre. Participants. The secondary care trusts saw 15–20 patients with new mesothelioma per year and the tertiary centre 30–40. The tertiary centre had a designated mesothelioma team. Twenty-one patients met the inclusion criteria: >18 years, mesothelioma diagnosis and in follow-up care. Non-English speaking participants, those unable to provide written informed consent or those whom the clinical team felt would find participation too distressing were excluded. All participants were white, 71% were 70–79 years old and 71% were men. Three consultation meetings were conducted with key stakeholders including mesothelioma nurse specialists, patients with mesothelioma, carers and local clinical commissioning group members. Main outcome measures. Specific outcomes were to gain a detailed understanding of mesothelioma follow-up care pathways and processes and to develop coproduced recommendations for practice. Results. Mesothelioma pathways were not always distinct from lung cancer care pathways. All trusts provided follow-up information and resources but there was varied information on how to access local support groups, research or clinical trial participation. Five themes were developed relating to people; processes; places; purpose and perception of care. Coproduced recommendations for improving mesothelioma follow-up pathways were developed following the consultation meetings. Conclusions. This study has developed recommendations which identify the need for patients with pleural mesothelioma to access consistent, specialist, streamlined mesothelioma care, centred around specialist mesothelioma nurses and respiratory consultants, with input from the wider multidisciplinary team

High-level inhibition of mitochondrial complexes III and IV is required to increase glutamate release from the nerve terminal

<p>Abstract</p> <p>Background</p> <p>The activities of mitochondrial complex III (ubiquinol-cytochrome <it>c </it>reductase, EC 1.10.2.2) and complex IV (cytochrome <it>c </it>oxidase EC 1.9.3.1) are reduced by 30-70% in Huntington's disease and Alzheimer's disease, respectively, and are associated with excitotoxic cell death in these disorders. In this study, we investigated the control that complexes III and complex IV exert on glutamate release from the isolated nerve terminal.</p> <p>Results</p> <p>Inhibition of complex III activity by 60-90% was necessary for a major increase in the rate of Ca²⁺-independent glutamate release to occur from isolated nerve terminals (synaptosomes) depolarized with 4-aminopyridine or KCl. Similarly, an 85-90% inhibition of complex IV activity was required before a major increase in the rate of Ca²⁺-independent glutamate release from depolarized synaptosomes was observed. Inhibition of complex III and IV activities by ~ 60% and above was required before rates of glutamate efflux from polarized synaptosomes were increased.</p> <p>Conclusions</p> <p>These results suggest that nerve terminal mitochondria possess high reserves of complex III and IV activity and that high inhibition thresholds must be reached before excess glutamate is released from the nerve terminal. The implications of the results in the context of the relationship between electron transport chain enzyme deficiencies and excitotoxicity in neurodegenerative disorders are discussed.</p