Ultraviolet Irradiation
Articles tagged with Ultraviolet Irradiation
Indoor tanning makes youthful skin much older on a genetic level
Researchers found that indoor tanning users in their 30s and 40s have more skin mutations than people twice their age, particularly in areas exposed to tanning beds. This can lead to an increased risk of skin cancer, including melanoma.
Ultraviolet-water: constructing angstrom-sized channels in polymer membranes
Researchers use ultraviolet light to create angstrom-sized channels in polymer membranes, allowing for precise separation of ions and small molecules. The technique enables sieving of monovalent ions from multivalent ions, with adjustable channel sizes.
Novel DNA-based assemblies for the development of remote-controlled microsystems
Scientists from Institute of Science Tokyo create photo-switchable binding of DNA nanostructures that generate two distinct directional motions. The research paves the way for innovative fluid-based diagnostic chips and molecular computers.
Tests on sunglasses show deficiencies in protection against ultraviolet rays
A study analyzing 12 sunglasses models found that only one met international safety limits for UV radiation exposure. The lenses lose their ability to block UV radiation over time, increasing the risk of eye damage. To minimize this risk, scientists suggest adopting ICNIRP limits as standard practice.
Lignin-based sunscreen offers natural and high-performance UV protection
Researchers developed a lignin sub-microsphere loaded with TiO2 for enhanced sunscreen capabilities, achieving SPF 42.93 and improved color properties.
Researchers shed light on how to make photopolymerization much more efficient
Researchers at Tokyo Institute of Technology have developed a novel strategy to increase the efficiency of photopolymerization reactions by leveraging dynamic UV lighting. This technique produces heavier polymer chains with reduced energy consumption, offering potential for sustainable industrial processes and polymeric materials.
Dermatologists find ultraviolet irradiation increases appetite but prevents body weight gain
Research published in the Journal of Investigative Dermatology reveals that UV exposure increases energy expenditure by inducing the 'browning' of subcutaneous fat, thereby preventing weight gain. This breakthrough discovery opens up new possibilities for treating obesity and metabolic disorders.
Germicidal lamps using UV-C radiation may pose health safety issues
Researchers investigated the biological repercussions of UV-C radiation exposure from readily available domestic lamps and found that even brief exposure can lead to irreversible alterations in skin cells and retinal cells. The study highlights the need to prioritize safe utilization of these lamps to prevent potential harm.
Tracing the origins of organic matter in Martian sediments
A study published in Nature Geoscience elucidates the discrepancy between Martian and Earth-based organic matter. Researchers found that photodissociation of carbon dioxide in the atmosphere leads to organic matter with depleted carbon-13 content, pointing to an atmospheric process as the main source.
UMass Amherst-led team creates biofilm-resistant glass for marine environments
A UMass Amherst-led team developed biofilm-resistant glass using UV radiation, which prevents biofilm formation on surfaces in underwater environments. The technology can be used for various applications, including disinfection of transparent surfaces like windows and camera lenses.
Towards A Better Way of Releasing Hydrogen Stored in Hydrogen Boride Sheets
Researchers develop electrochemical method to release hydrogen stored in hydrogen boride sheets, achieving high Faradaic efficiency. The process is expected to contribute to the development of safe and lightweight hydrogen carriers with low energy consumption.
Creating novel amino acid nanoparticles with enhanced anticancer activity
Researchers created nanoparticles using ultraviolet light crosslinked amino acids, loaded with doxorubicin and coated with tannic acid complex. The nanoparticles exhibited superior stability and drug release under different pH conditions, showing excellent anticancer activity in tumor-bearing mice.
Keeping Vilsmeier reagent in the flow: From toxin to medicine in one go
A new flow system produces both phosgene and the Vilsmeier reagent from chloroform with high efficiency, reducing energy consumption and waste. This scalable method enables versatile and safe chemical synthesis of a wide range of pharmaceutical chemicals, reducing dependence on foreign production.
Shedding light on a dark problem
Arizona State University researchers have developed a novel method of using UV-C light to inhibit biofilm growth in almost any space. The team successfully inhibited biofilm growth by delivering UV-C light through side-emitting optical fibers at low irradiance levels, achieving results comparable to continuous light exposure.
Double treatment stores salmon and strawberries for later
Researchers at King Abdullah University of Science & Technology have developed a two-step process that cuts food waste by reducing microbial growth. The treatment, which combines UV-C irradiation and vacuum sealing, extends shelf life by 67% for animal products like salmon, and up to 124% for strawberries.
Water cleanup method developed by University of California, Riverside, scientists destroys pervasive, cancer-causing “forever chemicals” or PFAS
Researchers at the University of California, Riverside, have created a novel method to break down per- and polyfluoroalkyl substances (PFAS), also known as 'forever chemicals', in contaminated water. The hydrogen-infusion and UV light-based process achieves high molecular destruction rates without generating unwanted byproducts.
New fluorophores could help fight cancer
Scientists have created new fluorescent chemical compounds for photodynamic therapy of cancerous tumors, which can stain affected tissues and destroy tumor cells without harm to healthy ones. The compound containing pyrene shows the highest fluorescent and anticancer activity.
Natural mineral hackmanite can change color almost indefinitely enabling numerous applications
Researchers found that hackmanite's structural breathing allows it to change color indefinitely due to sodium atoms moving inside a zeolitic cage. This property enables various applications such as UV monitoring and X-ray imaging.
Writing with light on titania
Researchers have developed a coating material that can be written on using UV light and erased again using oxygen, enabling reusable/rewritable surfaces in various applications. The material exhibits high contrast and stability, with up to 50 write-erase cycles possible without notable loss of contrast.
A new way to combat SARS-CoV-2: Using a desktop-sized air-curtain to inactivate almost 100% of coronavirus particles
Researchers at Nagoya University developed a device combining an air-curtain and LED irradiation to inactivate viruses in close environments. The technology blocks exhaled air and destroys virus particles, inactivating 99.9% of COVID-19 particles.
First anti-aging, coral safe sunscreen with Methylene Blue hits the market
Mblue Labs releases a coral-safe, broad-spectrum sunscreen containing Methylene Blue, which repairs photo-aging and delays skin aging. The product replaces Oxybenzone, a chemical UV blocker linked to coral reef destruction, providing safer protection for consumers and the environment.
Proton transfer between titania surface and dye observed for photocatalysis evaluation
A team of researchers at Shinshu University has successfully observed proton transfer between the titania surface and a dye molecule during UV light irradiation. The study used time-resolved fluorescence spectroscopy to measure the formation of basic hydroxyl groups on the titania surface, which accepts protons from the dye.
Chemical-free cleaning of bioreactor membranes
A team of scientists at KAUST has developed a novel approach for cleaning biofouled membranes in anaerobic bioreactors, combining UV irradiation with bacteriophages to eliminate bacteria. The method improved upon individual treatments and was proven effective over four cleaning cycles.
Some sunscreen mixtures lose effectiveness and become harmful during sun exposure
Researchers discovered that zinc oxide degrades other UV absorbers, reducing UVA protection by up to 91.8% after two hours of sunlight exposure. This could lead to increased formula toxicity and decreased sunscreen effectiveness, prompting calls for innovative new ingredients.
Mixing mineral and chemical sunscreens may limit protection against UVA
Researchers found that combining zinc oxide with small-molecule UV filter ingredients reduced UVA protection by 84.3-91.8% compared to non-mineral sunscreens. The study also showed toxic effects on zebra fish embryos when exposed to sunscreen mixtures containing zinc oxide.
Research shows potential new sunscreen is coral-safe and provides more UVB/UVA protection
Methylene Blue, a century-old medicine, has been found to be an effective UVB blocker that absorbs UVA and UVB rays, promotes DNA damage repair, and is safe for coral reefs. The study suggests it could become an alternative sunscreen ingredient, supporting the environment and human skin health.
Photoexpansion: Bio-based polyesters hard film
Researchers at Japan Advanced Institute of Science and Technology discover a phenomenon called photoexpansion in hard plastic films, which exhibits convex deformation under UV light due to cis isomerization. The study reveals the unique deformation mechanism of bio-based polycinnamate films, offering potential for precise control of ph...
Approaches for disinfecting occupied rooms efficiently and safely with UV light
Researchers used simulations to determine optimal placement of a UVGI device to sterilize a space safely. They found that ceiling height and material reflectance had a major impact on efficiency and safety, recommending higher heights and low-reflectance materials.
Stopping the clones may help win skin cancer battle
Researchers have found large clones of skin cells caused by UV exposure can be targeted to reduce skin cancers. This study suggests that stopping these clones may help win the battle against skin cancer.
Tanning may protect skin against harmful UV irradiation but block vitamin D synthesis
A new study from Brazil found that skin tanning protects against harmful UV irradiation but limits the skin's ability to produce vitamin D. The study, which evaluated 986 participants, showed that 72% had vitamin D deficiency and most people exposed to high levels of sunlight were deficient.
Chameleon proteins make individual cells visible
Researchers at ETH Zurich have developed a new microscopy technique that enables selective visualization of individual cells within complex tissue. Using 'chameleon proteins' like Dendra 2, they can highlight single cells or groups of molecules with one color while keeping other cells visible in another color.
Ultraviolet irradiation in ventilation systems could reduce office sickness
A study found UVGI significantly reduces reported work-related illnesses, particularly respiratory and mucosal symptoms, among 771 participants. The cost-effectiveness of UVGI installation compared to building-related illness losses is estimated to be favorable.
UV Radiation Induces Vitamin A Deficiency In Skin
Researchers discovered that UV radiation blocks the ability of skin cells to recognize retinoic acid, a nutrient made from vitamin A. This triggers a cascade of biochemical changes, causing a functional vitamin A deficiency in human skin. Pretreating skin with retinoic acid before UV exposure can limit the damage.