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La phototoxicité (photo-irritation) cutanée est définie comme une réaction toxique aiguë causée par des produits chimiques photoréactifs après administration de ces produits par la peau et exposition de la peau à la lumière ambiante. L'essai in vitro de phototoxicité sur épiderme humain reconstitué (EhR) vise à identifier le potentiel phototoxique d'un produit chimique d'essai administré par voie topique sur des tissus épidermiques humains reconstitués, avec ou sans exposition à la lumière solaire simulée. On évalue le potentiel phototoxique en calculant la réduction relative de la viabilité cellulaire, c'est-à-dire le rapport entre les viabilités des cellules exposées au produit chimique d'essai en présence de lumière solaire simulée et en l'absence de cette lumière. Les produits chimiques identifiés par cet essai sont susceptibles d'être phototoxiques in vivo, après administration par voie topique sur la peau, les yeux ou d'autres épithéliums externes exposés à la lumière.
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Skin phototoxicity (photoirritation) is defined as an acute toxic response elicited by topically or systemically administered photoreactive chemicals after the exposure of the skin to environmental light. The in vitro reconstructed human epidermis phototoxicity test (RhE PT) is used to identify the phototoxic potential of a test chemical after topical application in reconstructed human epidermis (RhE) tissues in the presence and absence of simulated sunlight. Phototoxicity potential is evaluated by the relative reduction in viability of cells exposed to the test chemical in the presence as compared to the absence of simulated sunlight. Chemicals identified as positive in this test may be phototoxic in vivo following topical application to the skin, eyes, and other external light-exposed epithelia.
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The birth of Louise Joy Brown - the world's first baby born following in-vitro fertilization - heralded a medical revolution. Forty years later, many thousands of babies are born each year following IVF. Assisted reproduction is a global industry with a multi-billion dollar turnover. It is a complex mix of science, clinical management, bioethics, and commercial imperatives. Many of the pioneers of IVF are still with us and have a fascinating tale to tell. Here, they relate the story of the development of IVF and related technologies in a way that will prove invaluable to future generations of practitioners seeking to understand the genesis of the specialty. This is not an academic history: rather it takes an informal and anecdotal approach; informing and entertaining for generations of past, present and future medical and scientific specialists of IVF, alongside the millions of parents, who celebrated the successes of IVF treatment worldwide.
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In the past several decades, there has been a substantial increase in the availability of in vitro test methods for evaluating chemical safety in an international regulatory context. To foster confidence in in vitro alternatives to animal testing, the test methods and conditions under which data are generated must adhere to defined standards to ensure resulting data are rigorous and reproducible. Good In vitro Method Practices (GIVIMP) for the development and implementation of in vitro methods for regulatory use in human safety assessment aims to help reduce the uncertainties in cell and tissue-based in vitro method derived chemical safety predictions. GIVIMP provides guidance for test method developers and end users of resulting data on key elementes of in vitro methods. GIVIMP tackles ten important aspects related to in vitro work: (1) Roles and responsibilities, (2) Quality considerations, (3) Facilities (4) Apparatus, material and reagents, (5) Test systems, (6) Test and reference/control items, (7) Standard operating procedures (SOPs), (8) Performance of the method, (9) Reporting of results, (10) Storage and retention of records and materials.
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Contemporary Dutch policy and legislation facilitate the use of high quality, accessible and affordable assisted reproductive technologies (ARTs) to all citizens in need of them, while at the same time setting some strict boundaries on their use in daily clinical practices. Through the ethnographic study of a single clinic in this national context, Patient-Centred IVF examines how this particular form of medicine, aiming to empower its patients, co-shapes the experiences, views and decisions of those using these technologies. Gerrits contends that to understand the use of reproductive technologies in practice and the complexity of processes of medicalization, we need to go beyond ‘easy assumptions’ about the hegemony of biomedicine and the expected impact of patient-centredness.
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