Low Reynolds Number Laminar Separation Bubble Control Using a Backward Facing Step

The problem of a laminar separation bubble on the upper surface of a 9.5% thick airfoil operated at low Reynolds number (RN = 380,000) was investigated experimentally. An unmodified LRN-010 airfoil and a modified LRN-010 airfoil with a backward facing step on its upper surface were built and tested in the ERAU wind tunnel in order to obtain pressure distributions and drag for different angles of attack. Results were found to be in good agreement with the results obtained from the XFOIL CFD code. It was concluded that the step cutout modification improves the airfoil’s lift-to-drag ratio at low angles of attack by tripping the boundary layer and decreasing the size of the laminar separation bubble. For higher angles of attack, the step cutout degraded the performance of the airfoil

1H-NMR metabolomics: Profiling method for a rapid and efficient screening of transgenic plants

Metabolomics-based approaches are methods of choice for studying changes in fruit composition induced by  environmental or genetic modulation of biochemical pathways in the fruit. Owing to enzyme redundancy and  high plasticity of the metabolic network, transgenic alteration of the activity of the enzymes from the central metabolism very often results in only slight modifications of the fruit composition. In order to avoid costly and  time-consuming plant analysis, we used a fast and sensitive 1H-NMR-based metabolomic profiling technique  allowing discovery of slight metabolite variations in a large number of samples. Here, we describe the  screening of transgenic tomato plants in which two genes from the central metabolism, phosphoenolpyruvate  carboxylase (EC.3.4.1.1) and malate synthase (EC 2.3.3.9) were silenced by antisens and RNAi strategy.  1H-NMR metabolomic profiles of methanol-d4 D2O buffer extracts of tomato fruit flesh were acquired and  subjected to unsupervised multivariate statistical analysis. 1H-NMR spectra were binned into variable-size  spectral domains, making it possible to get an overall analysis of a large number of resonances, even in the  case of uncontrolled variation of the chemical shift. Principal component analysis was used to separate groups  of samples and to relate known and unknown metabolites to transgenic events. The screening of 100 samples,  from extraction to data mining, took 36 h. Thus, this procedure allows the rapid selection of metabolic  phenotypes of interest among about 30 transgenic lines.Key words: Metabolome, GMO, tomato, fruit, 1H-NMR profiling, screening

Rapid identification of causal mutations in tomato EMS populations via mapping-by-sequencing

The tomato is the model species of choice for fleshy fruit development and for the Solanaceae family. Ethyl methanesulfonate (EMS) mutants of tomato have already proven their utility for analysis of gene function in plants, leading to improved breeding stocks and superior tomato varieties. However, until recently, the identification of causal mutations that underlie particular phenotypes has been a very lengthy task that many laboratories could not afford because of spatial and technical limitations. Here, we describe a simple protocol for identifying causal mutations in tomato using a mapping-by-sequencing strategy. Plants displaying phenotypes of interest are first isolated by screening an EMS mutant collection generated in the miniature cultivar Micro-Tom. A recombinant F2 population is then produced by crossing the mutant with a wild-type (WT; non-mutagenized) genotype, and F2 segregants displaying the same phenotype are subsequently pooled. Finally, whole-genome sequencing and analysis of allele distributions in the pools allow for the identification of the causal mutation. The whole process, from the isolation of the tomato mutant to the identification of the causal mutation, takes 6-12 months. This strategy overcomes many previous limitations, is simple to use and can be applied in most laboratories with limited facilities for plant culture and genotyping

Exploring Strategies for Developing Enabling Environments for People with Chronic Heart Disease: An Ethnographic Study Protocol

The impact of chronic diseases on people’s daily lives and the exponential number of people affected is a major public health issue. The consequences on individuals and their families is significant, particularly in terms of quality of life. In the literature, this phenomenon is well described in terms of care policy and cost. Although there is a link between a supportive environment and empowerment, there is little literature describing a supportive environment and the daily lives of people living with cardiovascular disease. The objectives of this study are to identify the strategies people use to develop an enabling environment. It will be a qualitative ethnographic study that will address both human behavior and the notion of culture in a broad sense. In the context of this study, an orientation towards critical ethnography will be considered for its particular interest in vulnerable people and in the power relations that may exist in the socio-cultural system. Data will be collected directly in people’s homes through observations and interviews with 10 people with cardiovascular disease. For each person, the data collection will take place over three days and will represent approximately 210 h of observation. This protocol was registered in the Research Register on 30 June 2021 and its number is 6933. This study will explore strategies for developing an enabling environment for people living with heart disease and eventually provide recommendations for nursing practices in terms of support

Exploring Strategies for Developing Enabling Environments for People with Chronic Heart Disease: An Ethnographic Study Protocol

International audienceThe impact of chronic diseases on people’s daily lives and the exponential number of people affected is a major public health issue. The consequences on individuals and their families is significant, particularly in terms of quality of life. In the literature, this phenomenon is well described in terms of care policy and cost. Although there is a link between a supportive environment and empowerment, there is little literature describing a supportive environment and the daily lives of people living with cardiovascular disease. The objectives of this study are to identify the strategies people use to develop an enabling environment. It will be a qualitative ethnographic study that will address both human behavior and the notion of culture in a broad sense. In the context of this study, an orientation towards critical ethnography will be considered for its particular interest in vulnerable people and in the power relations that may exist in the socio-cultural system. Data will be collected directly in people’s homes through observations and interviews with 10 people with cardiovascular disease. For each person, the data collection will take place over three days and will represent approximately 210 h of observation. This protocol was registered in the Research Register on 30 June 2021 and its number is 6933. This study will explore strategies for developing an enabling environment for people living with heart disease and eventually provide recommendations for nursing practices in terms of support

Defining an enabling environment for those with chronic disease: an integrative review

Abstract Background Health policies are currently being implemented to cope with the 37% of those affected by chronic disease and 63% of deaths worldwide. Among the proposals, there is accelerating support for greater autonomy for patients, which incorporates several concepts, including empowerment. To achieve this, develop an environment to increase an individual’s capacity for action seems to be a fundamental step. The aim of this study is to characterize an enabling environment for patients in the context of chronic disease management. Methods An integrative review design was applied. Medline, CINAHL, and Web of Science databases were searched to identify relevant literature published between 2009 and 2019. Overall, the review process was guided by the PRISMA 2020 checklist. The Mixed Methods Appraisal Tool for quality evaluation was used. Results A total of 40 articles were analyzed, divided into 18 quantitative studies, 11 qualitative studies, two mixed studies, seven expert opinions, one theory and one conference report. The following characteristics defining an enabling environment were taken from the literature relating to those with a chronic condition: Needs assessment-adaptation of responses, supporting “take care”, involvement in support, knowledge improvement, engagement with professionals, use of information and communication technologies, and organization of care. Beyond that, the interactions highlighted between these seven categories characterize an enabling environment. Conclusion This review specifies the essential elements of an enabling environment for patients with chronic conditions. It encompasses the partnership between the healthcare professional, such as the advanced practice nurse, and the individual for whom interventions and care strategies must be devised

Organic acid metabolism during the fruit development of two peach cultivars

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Metabolic profiling of fruit tissues during tomato development

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Qualité des fruits : approches métabolique, biotechnologique et génomique

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Tissular specificity of metabolic profiles during tomato fruit development

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