A portable instrument for measuring macular pigment with central fixation

urpose: To evaluate the reliability and validity of a portable instrument for measuring macular pigment optical density. Methods: The instrument is small, uses light emitting diodes as light sources and the principles of heterochromatic flicker photometry of comparing foveal and extra-foveal minimum flicker matches. It uses central fixation for the extra-foveal matches, which subjects found easier than eccentric fixation. Subjects with healthy eyes used the instrument to measure their pigment density in a number of eye clinics. Results: The mean pigment density in 124 eyes in 124 individuals was 0.41 +/- 0.16 (mean +/- sd), there was no significant change with age but the density was less in females, those with light irides, smokers, subjects on diets low in precursor carotenoids and in those exposed to several hours of daylight every day or who used sun beds. Conclusions: The portable instrument gave valid and reliable data that confirmed published values for macular pigment. It was convenient to use in the clinic and has potential as a screening tool

Fibroblasts in atherosclerosis:heterogeneous and plastic participants

Purpose of review Fibroblasts are very heterogeneous and plastic cells in the vasculature. A growing interest in fibroblasts in healthy and atherosclerotic vasculature is observed, next to macrophages, endothelial cells, and smooth muscle cells (SMCs). In this review, we discuss fibroblast presence, heterogeneity, origin, and plasticity in health and atherosclerosis based on latest literature. Recent findings With help of single cell sequencing (SCS) techniques, we have gained more insight into presence and functions of fibroblasts in atherosclerosis. Next to SMCs, fibroblasts are extracellular matrix-producing cells abundant in the vasculature and involved in atherogenesis. Fibroblasts encompass a heterogeneous population and SCS data reveal several fibroblast clusters in healthy and atherosclerotic tissue with varying gene expression and function. Moreover, recent findings indicate interesting similarities between adventitial stem and/or progenitor cells and fibroblasts. Also, communication with inflammatory cells opens up a new therapeutic avenue. Because of their highly plastic and heterogeneous nature, modulating fibroblast cell function and communication in the atherosclerotic vessel might be useful in battling atherosclerosis from within the plaque

Polyvascular Atherosclerotic disease: Echocardiographic and metabolic determinants of adverse cardiac outcome

Peripheral Arterial Disease (PAD) is a multifactorial syndrome that most commonly affects people over 60 years of age. With the aging of the population, the prevalence of atherosclerotic disease and its associated adverse outcomes will increase. It has to be noted that the process of established atherothrombosis is not limited to a single arterial location, giving it the character of a systemic and generalized disease. The Reduction of Atherothrombosis for Continued Health (REACH) registry demonstrated that one out of six patients with (i) PAD, (ii) cerebrovascular disease, or (iii) coronary artery disease had involvement of one or two other arterial beds. Importantly, the presence of multiple affected arterial territories, called polyvascular disease, has been demonstrated to be an independent predictor of long-term cardiovascular outcome in the general population. In response to studies demonstrating the adverse prognosis of atherosclerotic disease, the need for adequate risk factor stratification and reduction has emerged. The importance of risk factor reduction in patients with PAD has resulted in universally recommended atherothrombotic risk factor reduction, with the objective of decreasing the high incidence of heart disease and cerebrovascular disease associated with PAD. In patients with PAD scheduled for vascular surgery, risk factor stratification is directed at the detection of (a)symptomatic atherosclerotic disease in other vascular beds than the primary symptomatic arterial location. Early detection of polyvascular atherosclerotic disease has important consequences for risk factor reduction strategies, including life-style interventions and medical therapy

The proof of the pudding is in the eating? Implementation of cooperative learning:Differences in teachers’ attitudes and beliefs

In the current study differences between primary school teachers classified as high-performing in their implementation of cooperative learning (CL) in their classrooms and teachers who were less successful in implementing cooperative learning were investigated. The levels of implementation of cooperative learning differed significantly between teachers, especially in teaching students the needed cooperative behaviours. Based on semi-structured interviews, it was found that low-performing CL teachers struggle more with student behaviour during cooperative learning, while high-performing CL teachers feel more able to regulate student behaviour. We concluded that teachers who differed in their teacher performance of implementation of cooperative learning also differed in their attitudes and beliefs about this approach. An integrated model on professional development and teacher change is proposed to interpret the results of differences between teachers. This model shows that positive attitudes and beliefs before implementation, but also experiencing positive student outcomes (incl. positive student behaviour) during implementation are important factors in making cooperative learning successful in practice. We suggest that teachers should be prevented from entering a negative spiral in which they experience student behaviour during cooperative learning only as difficult and, therefore, do not succeed in improving students’ cognitive and behavioural outcomes

Peri-articular histiocytic sarcoma in Bernese Mountain Dogs : a retrospective investigation of the prevalence of this tumour in association with previously diseases joints

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