Download or read book Ultrafast Spectroscopy of Natural Sunscreen Filters written by Jack Matthew Woolley and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrafast Spectroscopy of Plant inspired UV Filters for Sunscreen and Photothermal Applications written by Temitope Tosin Abiola and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Towards a Deeper Understanding of the Photodynamics of UV Filters for Sunscreen Applications Using Ultrafast Spectroscopy and Complementary Analytical Techniques written by Emily L. Holt and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vibrationally Mediated Chemical Dynamics written by Jacob Dean and published by Frontiers Media SA. This book was released on 2021-06-11 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inorganic Ultraviolet Filters in Sunscreen Products written by Nazia Hassan Kera and published by Springer Nature. This book was released on with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Encyclopedia of Ultraviolet Filters written by Nadim A. Shaath and published by Allured Publishing Corporation. This book was released on 2007-01-01 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most comprehensive and up-to-date compilation of data on every ultraviolet filter approved for sunscreen use worldwide. All UV filters approved in the United States, Canada, Europe, Japan, China, Australia, New Zealand, South Africa and South America are included. This manual includes descriptions of the three types of ultraviolet filters: organic UV absorbers, inorganic particulates and organic particulates. INCI names, USAN names, chemical and common names are cross-referenced in a handy guide. Suppliers, trade names and their addresses are included also. The Encyclopedia of Ultraviolet Filters also will review the current status and recent developments in the sunscreen and the ultraviolet filters industry. Updated worldwide regulations on more than 50 ultraviolet filters in use today, including: -Quality control and testing procedures -Sample MSDS¿s -Certificates of analysis -Specifications sheets -Chemical structures -Spectroscopic data -UV absorbance (UVA, UVB or both) -Maximum absorbance -Extinction coefficients
Download or read book Organic and Inorganic UV Filters in Sunscreen Formulations written by and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Women in science Chemistry 2021 written by Valeria Conte and published by Frontiers Media SA. This book was released on 2023-02-01 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrafast Spectroscopy of New Organic Molecules for Photovoltaic Applications written by Thomas Roland and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The topic of this thesis is the study -through different spectroscopy methods- of new organic molecules for photovoltaic applications. Combination of time resolved fuorescence, time resolved differential absorption and spectro-electro-chemistry with global analysis methods allowed to determine the photo-dynamics of the studied molecules. Two familiesof molecules have been studied. The first one is a donor-type antenna based on the BODIPY dye. The second consists in a donor-acceptor-donor (DAD) triad, with self-organizing properties. After a first generation of molecules that we proved to be limited by a short life time of its charge transfer state (about 55 ps), a second generation of molecules wasdeveloped, including several variation of the donor group, which allowed to study the impact of said variation. Among others, a charge transfer state lifetime longer than 1 nanosecond was observed.
Download or read book Evaluating UVB and UVA Boosting Technologies for Chemical and Physical Sunscreens written by An Ngoc Hiep Huynh and published by . This book was released on 2020 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are currently 14 organic and 2 inorganic UV filters approved in the United States. Due to coral reef safety concerns, octinoxate and oxybenzone have been banned in Hawaii, Key West, FL and the US Virgin Islands; and octocrylene is also being studied for its potential impact on coral reef safety, leaving 11 organic UV filters as viable options for sunscreen manufacturers - with limitations on their combination. Since consumers are always looking for sunscreens with high SPF and broad-spectrum protection, the need for UVB and UVA protection boosting technologies is greater than ever. In a preliminary study, about two dozen emollients were scanned for their SPF boosting capability with selected organic UV filters. In this study, our goal was to evaluate whether and to what extent the in vitro SPF and broad-spectrum protection of three selected organic UV filters (homosalate, octisalate and avobenzone) and the two inorganic UV filters (zinc oxide and titanium dioxide) can be boosted with three selected emollients (diethylhexyl 2,6-naphthalate, C12-15 alkyl benzoate, and butyloctyl salicylate), and an SPF boosting ingredient (SunSpheresTM). Organic, inorganic and mixed organic/inorganic sunscreens were formulated and tested for stability, viscosity, spreadability (TA.XTPlus texture analyzer), and droplet size; as well as in vitro SPF and broad-spectrum protection (LabSphere 2000S), and water resistance. The results show that C12-15 alkyl benzoate provided the highest in vitro SPF out of three emollients tested for the organic sunscreens. However, this ingredient did not form a stable emulsion with our inorganic ingredients, therefore, butyloctyl salicylate was selected to be used for this research project. Titanium dioxide had a higher in vitro SPF value; however, zinc oxide provided broader spectrum protection. Therefore, zinc oxide was selected to be combined with the organic UV filters. We observed an in vitro SPF increase in the case of all sunscreens after exposing the sunscreens to a 20-minute water bath. We believe that the film-former, i.e., polyamide-8 and the drying time contributed to higher SPF values after the water bath. All sunscreens had a shear-thinning behavior, which is typical for creams and lotions. Overall, the organic/inorganic UV filter-based sunscreen containing the SunSpheresTM (CS) performed the best in terms of in vitro SPF, water-resistance, and spreadability.
Download or read book Percutaneous Absorption of UV Filters Contained in Sunscreen Cosmetic Products written by Zacarias Leon Gonzalez and published by . This book was released on 2014-01-31 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanotechnology in Dermatology written by Adnan Nasir and published by Springer Science & Business Media. This book was released on 2012-12-02 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology in Dermatology is the first book of its kind to address all of the important and rapidly growing aspects of nanotechnology as it relates to dermatology. In the last few years there has been an explosion in research and development for products and devices related to nanotechnology, including numerous applications for consumers, physicians, patients, and industry. Applications are underway in medicine and dermatology for the early detection, diagnosis, and targeted therapy of disease, and nanodesigned materials and devices are expected to be faster, smaller, more powerful, more efficient, and more versatile than their traditional counterparts. Written by experts working in this exciting field, Nanotechnology in Dermatology specifically addresses nanotechnology in consumer skin care products, in the diagnosis of skin disease, in the treatment of skin disease, and the overall safety of nanotechnology. The book also discusses future trends of this ever-growing and changing field, providing dermatologists, pharmaceutical companies, and consumer cosmetics companies with a clear understanding of the advantages and challenges of nanotechnology today.
Download or read book Multidimensional Ultrafast Spectroscopy of Photosynthetic Pigment Protein Complexes written by Eleonora De Re and published by . This book was released on 2014 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents the application of ultrafast spectroscopy to the investigation of pigment-protein complexes (PPCs) involved in energy transfer and energy dissipation in photosynthetic organisms. PPCs are the building blocks of all photosynthetic organisms, and within individual pigment-protein complexes, energy transfer dynamics occur over fast timescales and broad spectral regions. Chapter 1 gives an introduction to the capability of photosynthetic organisms to absorb light energy, funnel this energy to a location for charge separation, and perform charge separation with subsequent conversion into chemical energy. All of these functions need to be performed efficiently under different light conditions. This chapter also includes a discussion of the different light harvesting strategies that various photosynthetic organisms have evolved. Lastly, this chapter discusses the application of ultrafast spectroscopy as an excellent tool to study the dynamics of PPCs. The three experimental techniques used in this dissertation are introduced in this chapter. Chapters 2 and 3 present the application of two ultrafast spectroscopic techniques, two dimensional electronic spectroscopy and transient absorption spectroscopy, to the investigation of the structure-function relationship of photosynthetic pigment-protein complexes. Chapter 2 is an investigation of the photophysics of the two forms of the Orange Carotenoid Protein, involved in excess energy dissipation in cyanobacteria. Ultrafast spectroscopy allows us to understand how a conformational change that modifies pigment-protein interactions is able to generate a different biological function. Chapter 3 presents degenerate and non-degenerate two dimensional electronic spectroscopy experiments to investigate the energy transfer dynamics and couplings in the bacterial reaction center, which is the location of charge separation. Chapter 4 investigates a PPC involved in excess energy dissipation in green algae, LhcSR. Fluorescence lifetime spectroscopy is used to investigate the excited state properties of LhcSR, which plays a role as light harvester, pH sensor and quencher in algae. The results allow us to identify two conformations, a light harvesting one and a quenching one. Transient absorption spectroscopy is used to investigate the energy transfer pathways involved in quenching in the two different conformations. Finally, Chapter 5 presents conclusions and extensions to future work, in order to improve our understanding of the energy transfer dynamics in natural photosynthetic systems.
Download or read book Clinical Guide to Sunscreens and Photoprotection written by Henry W Lim and published by CRC Press. This book was released on 2019-08-30 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed with practicing dermatologists, dermatology trainees, physicians, and scientists interested in photoprotection in mind, this concise and highly illustrated guide provides the latest knowledge of photoprotection in dermatology and cosmetic science. Clinical Guide to Sunscreens and Photoprotection also addresses recent important international and domestic regulatory activity and requirements on the use of novel sun protective chemicals and proper labeling of products to ensure increased consumer awareness. This concisely written, problem-oriented text explores:
Download or read book Ultrafast Spectroscopy of Chemical and Biological Processes written by and published by . This book was released on 1990 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Research Review of Interventions to Increase the Persistence and Resilience of Coral Reefs written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2019-04-05 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coral reef declines have been recorded for all major tropical ocean basins since the 1980s, averaging approximately 30-50% reductions in reef cover globally. These losses are a result of numerous problems, including habitat destruction, pollution, overfishing, disease, and climate change. Greenhouse gas emissions and the associated increases in ocean temperature and carbon dioxide (CO2) concentrations have been implicated in increased reports of coral bleaching, disease outbreaks, and ocean acidification (OA). For the hundreds of millions of people who depend on reefs for food or livelihoods, the thousands of communities that depend on reefs for wave protection, the people whose cultural practices are tied to reef resources, and the many economies that depend on reefs for fisheries or tourism, the health and maintenance of this major global ecosystem is crucial. A growing body of research on coral physiology, ecology, molecular biology, and responses to stress has revealed potential tools to increase coral resilience. Some of this knowledge is poised to provide practical interventions in the short-term, whereas other discoveries are poised to facilitate research that may later open the doors to additional interventions. A Research Review of Interventions to Increase the Persistence and Resilience of Coral Reefs reviews the state of science on genetic, ecological, and environmental interventions meant to enhance the persistence and resilience of coral reefs. The complex nature of corals and their associated microbiome lends itself to a wide range of possible approaches. This first report provides a summary of currently available information on the range of interventions present in the scientific literature and provides a basis for the forthcoming final report.
Download or read book Applied Photochemistry written by Giacomo Bergamini and published by Springer. This book was released on 2016-07-28 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph features what happens when light meets molecules. This edited volume contains contributions from an international array of contributors, and it is divided into sections representing a selection of carefully focussed and connected photochemistry topics: energy, technology, medicine, environmental sciences, and art. In each section one or more chapters illustrates relevant aspects of each field, such as artificial photosynthesis and solar energy conversion (energy), light emitting devices and photochromic dyes (technology), and photodynamic therapy and solar filters (medicine). Aimed at students of all levels and researchers active in photochemistry.
