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Nouvelles Methodes Devaluation De Lefficacite Des Photoprotecteurs Externes
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Book Synopsis Nouvelles méthodes d'évaluation de l'efficacité des photoprotecteurs externes by : Julie Waills
Download or read book Nouvelles méthodes d'évaluation de l'efficacité des photoprotecteurs externes written by Julie Waills and published by . This book was released on 2005 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: La première partie est consacrée au rayonnement solaire et à ses effets sur la peau (érythème solaire, photocarcinogenèse, immunosuppression...).La deuxième partie s'interesse aux produits de protection solaire et aux méthodes actuelles d'évaluation de leur efficacité , avec la définition du SPF et des différents indices UVA ( qui semblent inadaptés à apprécier les dégâts occasionnés aux cellules par les UV et notamment les effets délétères à long terme) .La dernière partie décrit les nouvelles méthodes d'évaluation de l'efficacité des protecteurs solaires, des plus courantes: P53, test de la comète, comptage des dimères de thymines, étude des sunburns cells, au plus confidentielles: études de marqueurs de l'immunosuppression et du photovieillissement, de kératoses et de naevus.
Book Synopsis METHODES D'EVALUATION DE L'EFFICACITE DES PHOTOPROTECTEURS EXTERNES by : FLORENCE.. MARCHAL
Download or read book METHODES D'EVALUATION DE L'EFFICACITE DES PHOTOPROTECTEURS EXTERNES written by FLORENCE.. MARCHAL and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis La photoprotection externe by : Robert Sevy
Download or read book La photoprotection externe written by Robert Sevy and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La photoprotection externe est justifiée par les risques cutanés encourus lors d'expositions solaires, par saturation des défenses naturelles chez le sujets sains, d'emblée chez le sujets atteints de photodermatoses. Les différents moyens de lutte anti-solaire sont passés en revue. Les préparations contenant des filtres et/ou des écrans font l'objet d'une étude pharmacologique détaillée , insistant tout particulièrement sur les divers modes d'évaluation de l'efficacité de ces produits. Du domaine des indications de la photoprotection externe doit se dégager la notion d'éducation sanitaire concernant le risque actinique et sa prévention. Enfin, une étude expérimentale illustre la difficulté d'une standardisation du coefficient de protection.
Book Synopsis Détermination par méthode in vitro de l'efficacité de différents systèmes photoprotecteurs (vêtements, verres, produits solaires) by : Sara Ghazi
Download or read book Détermination par méthode in vitro de l'efficacité de différents systèmes photoprotecteurs (vêtements, verres, produits solaires) written by Sara Ghazi and published by . This book was released on 2011 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt: Devant le problème de santé publique que constitue l'augmentation du nombre des cancers cutanés photo-induits, il nous a paru important de faire le point sur l'efficacité des différents systèmes photoprotecteurs à disposition. Les vêtements constituent le moyen le plus simple et le plus ancien de se protéger du soleil. Cependant la question du niveau de photoprotection atteint se pose. Qu'en est-il du niveau photoprotecteur de la garde-robe d'un adulte? d'un enfant? Comment est protégé l'enfant, qui les jours de congés, pratique un sport de plein air qui l'expose pendant plusieurs heures aux rayons du soleil? Nous avons souhaité répondre à ces questions en déterminant l'efficacité photoprotectrice des vêtements en utilisant une technique in vitro, la technique in vivo actuellement employée nous semblant peu éthique. La méthode qui consiste à irradier les échantillons et à déterminer le pourcentage de rayonnement transmis, permet de calculer un indicateur d'efficacité: l'UV-Protection Factor (ou UV-PF). Les valeurs d'UPF obtenus varient en fonction de la nature du tissu, de la couleur de celui-ci et de son épaisseur. L'intérêt de la superposition a été clairement mis en évidence. L'influence du lavage sur le niveau de photoprotection a été évaluée. L'adjonction de filtres UV dans les lessives ne nous parait pas pertinent dans la mesure où l'augmentation de l'effet photoprotecteur obtenue n'est pas supérieure à celle liée au simple rétrécissement du tissu dans le cas d'un T-shirt en coton. L'impact environnemental de l'utilisation massive de tels actifs dans les lessives serait certainement considérable et ne serait associé à un aucun effet bénéfique supplémentaire pour l'homme. L'étude de verres de lunettes a également permis de montrer qu'un effet photoprotecteur large nécessite l'association de différents facteurs: une nature de verre appropriée, une couleur et une épaisseur adéquate. Le souci des dermatologues étant de conseiller à leurs patients et en particulier aux plus jeunes, la meilleure crème solaire possible, nous nous sommes attachés à définir les critères d'une « bonne» crème solaire. Avant tout, il s'agit d'une crème pour laquelle la valeur de SPF (Sun Protection Factor) déterminée est en adéquation avec la valeur de SPF affichée. Il s'avère que toutes les crèmes du commerce ne remplissent pas cette condition. Nous avons, en effet, démontré que les crèmes biologiques ne renfermant que des filtres inorganiques (Ti02 et/ou ZnO) ne peuvent pas permettre d'atteindre de hauts niveaux de protection. Une bonne crème renferme donc un mélange de filtres organiques et inorganiques couvrant la plus large gamme de spectre UV et est exempt d'ingrédients type alcool. Ce travail nous a permis de quantifier l'efficacité de différents systèmes photoprotecteurs, qui sont complémentaires et doivent être, le plus souvent possible, utilisés de façon concomittante.
Book Synopsis Evaluation clinique des photoprotecteurs externes by : Annae͏̈lle Bonnec
Download or read book Evaluation clinique des photoprotecteurs externes written by Annae͏̈lle Bonnec and published by . This book was released on 2004 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les progrès réalisés dans le domaine de la photobiologie ont permis une meilleure connaissance des phénomènes moléculaires impliqués dans l'interaction entre le rayonnement solaire et le tégument cutané. La prise de conscience des dangers liés à une exposition solaire prolongée a contribué à l'essor de l'utilisation de photoprotecteurs venant suppléer les mécanismes endogènes de protection. Dans le domaine de la protection solaire, la recherche s'est orientée vers la conception de produits plus efficaces, mieux tolérés, à la galénique de plus en plus sophistiquée garante de leur utilisation régulière. Cette évolution a entraîné la mise au point de techniques d'évaluation des produits solaires en terme d'efficacité vis-à-vis des altérations biologiques photoinduites, d'innocuité, et de qualité cosmétique. (érythème, photovieillissement, apparition de cancers cutanés), des effets néfastes des UVA longtemps sous-estimés, et de l'impact de la disparition de la couche d'ozone
Book Synopsis Cutaneous Side Effects of Drugs by : Konrad Bork
Download or read book Cutaneous Side Effects of Drugs written by Konrad Bork and published by W.B. Saunders Company. This book was released on 1988 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Micelles, Membranes, Microemulsions, and Monolayers by : William M. Gelbart
Download or read book Micelles, Membranes, Microemulsions, and Monolayers written by William M. Gelbart and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last decades, the study of surfactants (detergents, for example) has been profoundly changed by ideas and techniques from physics, chemistry, and materials science. Among these are: self assembly; critical phenomena, scaling, and renormalization; high-resolution scattering, and magnetic resonance spectroscopy. This book represents the first systematic account of these new developments, providing both a general introduction to the subject as well as a review of recent developments. The book will be a very useful tool for the biophysist, biochemist or physical chemist working in the field of surfactants.
Book Synopsis Oxidative Stress and Redox Regulation by : Ursula Jakob
Download or read book Oxidative Stress and Redox Regulation written by Ursula Jakob and published by Springer Science & Business Media. This book was released on 2013-03-15 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many physiological conditions such as host defense or aging and pathological conditions such as neurodegenerative diseases, and diabetes are associated with the accumulation of high levels of reactive oxygen species and reactive nitrogen species. This generates a condition called oxidative stress. Low levels of reactive oxygen species, however, which are continuously produced during aerobic metabolism, function as important signaling molecules, setting the metabolic pace of cells and regulating processes ranging from gene expression to apoptosis. For this book we would like to recruit the experts in the field of redox chemistry, bioinformatics and proteomics, redox signaling and oxidative stress biology to discuss how organisms achieve the appropriate redox balance, the mechanisms that lead to oxidative stress conditions and the physiological consequences that contribute to aging and disease.
Book Synopsis Crop Wild Relative Conservation and Use by :
Download or read book Crop Wild Relative Conservation and Use written by and published by CABI. This book was released on 2008 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crop wild relatives (CWR) are species closely related to crop plants which can contribute beneficial traits such as pest or disease resistance and yield improvement. Through an examination of national, regional and global context of CWR, this text presents methodologies and case studies that provide recommendations for global conservation and use.
Book Synopsis Seed Conservation by : Roger D. Smith
Download or read book Seed Conservation written by Roger D. Smith and published by Royal Botanic Gardens Kew. This book was released on 2003 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book is a review of the current scientific knowledge that underpins seed banking, a technology which plays a key role in the conservation of both domesticated and non-domesticated plant speices..."--Publisher description.
Download or read book Photodamage written by Barbara Gilchrest and published by Wiley-Blackwell. This book was released on 1995-09-06 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The adverse effects of sunlight on the skin are well known, but only now is the scientific basis and rationale for treatment being evaluated. With the current level of interest from the general public and dermatologists in suntanning, sunburn and skin cancer, there is a great need for an authoritative, comprehensive review of the mechanisms, prevention and treatment of photodamage. There are only a handful of reputable clinical investigators who could put together an important volume and of this group, Dr. Gilchrest is probably the leading worker. She has collected all the latest information on photobiology, the effect of light on skin structure and function, clinical problems, prevention in adults and children, and medical and surgical treatment
Book Synopsis Radiofrequency in Cosmetic Dermatology by : M. Lapidoth
Download or read book Radiofrequency in Cosmetic Dermatology written by M. Lapidoth and published by Karger Medical and Scientific Publishers. This book was released on 2014-12-22 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radiofrequency (RF) has been used in many areas of medicine for some time, but only gained popularity in aesthetics in the early 2000s. Although initial procedures provided variable results, the field of RF has grown dramatically. Currently, a multitude of devices which offer an array of technologies, each geared to specific applications, are on the market. In this book, a comprehensive discussion of the evolving area of RF is provided, and the current and cutting-edge technologies which span from noninvasive treatments of facial wrinkles to invasive body contouring procedures are discussed in detail. The methodologies covered include thermal and ablative modalities, volumetric and fractional approaches, as well as practical aspects of application in clinical practice. Included are also pearls on patient management and prevention and treatment of complications. Finally, RF-based procedures are compared with equivalent laser and surgical approaches in a risk-benefit evaluation. Reviewing the standard of care for RF-based treatments and providing information relevant for clinical decision-making and practice management, this publication is a valuable tool for dermatologists, plastic surgeons and all practitioners who use or are contemplating the introduction of RF into practice.
Book Synopsis Growth and Reproductive Strategies of Freshwater Phytoplankton by : Craig D. Sandgren
Download or read book Growth and Reproductive Strategies of Freshwater Phytoplankton written by Craig D. Sandgren and published by Cambridge University Press. This book was released on 1988 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: The botanical and ecological literature is brought together in this book in order to discuss the morphological, reproductive and physiological characteristics of these microscopic organisms.
Book Synopsis Forests: Elements of Silvology by : Roelof A.A. Oldeman
Download or read book Forests: Elements of Silvology written by Roelof A.A. Oldeman and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 639 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silvology is the general science of forest ecosystems, without the usual division between Man and Nature. This systematic treatment of forests intends to integrate and harmonize existing approaches with the help of systems modeling in a hierarchy of close system levels, according to criteria of biological architecture, biomass production and species composition. Scientists and practitioners will appreciate this synoptic treatment of forests and their ecology, allowing the balance of holistic and reductionist viewpoints, and the placement of phenomena and techniques. Topics covered include: - introduction of the methods, - sections on forest organisms, - a special chapter on trees, - eco-units, i.e. forest ecosystems developing after some zero-event like fire, storm or waterlogging, - silvatic mosaics built by the eco-units of different size, architecture and species composition, - a summary of silvological rules determining system's behaviour at every level, e.g. fragmentation and fusion, transfer of functions, irreversibility and process oscillation.
Book Synopsis Tropical Trees and Forests by : F. Halle
Download or read book Tropical Trees and Forests written by F. Halle and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis External Actors and Development Integration in Sub-Saharan Africa by : Andrea Cornwall
Download or read book External Actors and Development Integration in Sub-Saharan Africa written by Andrea Cornwall and published by . This book was released on 1993 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Tropical Rain Forest by : Marius Jacobs
Download or read book The Tropical Rain Forest written by Marius Jacobs and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, tropical forests have received more attention and have been the subject of greater environmental concern than any other kind of vegetation. There is an increasing public awareness of the importance of these forests, not only as a diminishing source of countless products used by mankind, nor for their effects on soil stabilization and climate, but as unrivalled sources of what today we call biodiversity. Threats to the continued existence of the forests represent threats to tens of thousands of species of organisms, both plants and animals. It is all the more surprising, therefore, that there have been no major scientific accounts published in recent years since the classic handbook by Paul W. Richards, The Tropical Rain Forest in 1952. Some excellent popular accounts of tropical rain forests have been published including Paul Richard's The Life of the Jungle, and Catherine Caulfield's In the Rainforest and Jungles, edited by Edward Ayensu. There have been numerous, often conflicting, assessments of the rate of conversion of tropical forests to other uses and explanations of the underlying causes, and in 1978 UNESCO/UNEPI FAO published a massive report, The Tropical Rain Forest, which, although full of useful information, is highly selective and does not fully survey the enormous diversity of the forests.
