Articles tagged with Ultraviolet Radiation
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Researchers used microscopy techniques to study polyfluorene chains and found that intra-chain aggregation causes green emission, which disappears when the chain unfolds. The team also discovered a novel optomechanical force acting on some chains, originating from van der Waals interactions and excitonic coupling.
A team from Nanjing University and Sun Yat-Sen University developed a two-facing Janus OPO scheme for generating high-efficiency, high-purity broadband LG modes with tunable topological charge. The output LG mode has a tunable wavelength between 1.5 μm and 1.6 μm, with a conversion efficiency above 15 percent.
A new study from NASA's Chandra program reveals that exploded stars can pose a significant risk to nearby planets due to intense X-ray radiation, potentially altering atmospheric chemistry and causing mass extinctions.
Two natural coumarin compounds, 5-MOS and 6-MOS, have been identified in the orange climber plant, exhibiting aggregation-induced emission properties. These compounds can clearly identify mitochondria in live cells without additional processing, making cell imaging easier and faster.
Researchers found that metal-poor stars, with fewer heavy elements, emit less intense ultraviolet radiation into space. This allows their planets to form a protective ozone layer, making conditions more life-friendly. The study suggests that as the universe ages, it becomes increasingly unfavourable for complex life on new planets.
Researchers have developed a novel photoelectrochemical ultraviolet photodetector that can detect two types of ultraviolet light using a multilayered nanostructure. The detector's performance can be regulated through light intensity and external bias, enabling easy adaptation to environmental changes.
A new type of meta-optics, developed at Harvard, has been successfully tested at Graz University of Technology, allowing the observation of ultra-fast physical processes. The lens uses extreme ultraviolet radiation to track charge carriers in space and time, enabling optimization of modern transistors and optoelectronic circuits.
A study found that adding rosmarinic acid to sunscreen increases sun protection factor by over 41% and reduces the need for synthetic chemicals. The natural antioxidant also provides anti-aging benefits, making it a potential multifunctional compound for improved skin health.
Astronomers have found that Saturn's vast ring system is heating the giant planet's upper atmosphere, a phenomenon that could provide insights into the atmospheres of distant worlds. The discovery was made using archival ultraviolet-light observations from four space missions, including Hubble and Cassini.
Researchers at Pohang University of Science & Technology (POSTECH) created a multifunctional vortex beam capable of operating with a wide range of light frequencies using a metasurface. The breakthrough technology has the potential to store more information at the same frequency, paving the way for 6G communication systems.
Researchers developed a coral-reef-friendly sunscreen by using polymerization to create large molecules that block UV radiation without penetrating skin or coral. The new filter was found to be more effective at preventing sunburn in mice than existing sunscreens, while also being safe for coral and algae.
Researchers found that solar water disinfection (SODIS) was effective in inactivating Escherichia coli bacteria at both low and high altitudes. At high altitudes, bacterial inactivation increased by 1.7-fold after two hours, with no significant differences after six hours. The study highlights the potential of SODIS to improve global a...
Researchers used C-trap technology to investigate how different DNA repair proteins identify and bind to their respective forms of damage. They found that some proteins arrived at the damage site together and departed together, while others showed surprising variability in their association and dissociation patterns. The study provides...
Simulations suggest a tenfold increase in frequency, with peak powers reaching 100 trillion watts, enabling more efficient generation of high-energy laser light. The new approach involves wakesurfing behind electron beams, maintaining coherence and alignment of the waves.
Carolina researchers have engineered silicon nanowires that can convert sunlight into electricity, splitting water into oxygen and hydrogen gas. This innovative design enables the production of a greener alternative to fossil fuels, making it more competitive with traditional energy sources.
Researchers have discovered that fungi in orange lichens can transport toxic pigments out of their cells, creating a 'sunscreen effect'. This mechanism allows the lichens to reflect harmful radiation while still allowing some solar radiation to pass through for photosynthesis.
A study by researchers from Hosei University and Kyoto University found that the red velvet mite's bright red pigment is primarily composed of astaxanthin, a powerful antioxidant. This high concentration of antioxidants helps protect the mites from harsh environments caused by UV radiation and heat.
Scientists from Tokyo Metropolitan University have developed a new electrode material for deep-ultraviolet light-emitting diode applications, combining excellent electrical conductivity with unprecedented transparency. The new electrodes promise to impact industry by enabling more efficient and compact light sources for sterilization p...
Researchers found that UV nail polish dryers cause cell death, mitochondrial damage, and DNA mutations, leading to cancer-causing effects. Chronic use of these devices poses a significant public health risk.
Researchers developed a 'space skin' that can reduce operating temperatures of space-qualified structures from 120°C to 60°C. The nano-coating, called MFNS, also enables the harvest of energy for later use.
Experiments show that UV light from the sun breaks down plastics on the ocean surface, turning them into smaller, invisible nanoplastic particles. This process could account for a substantial amount of the 'Missing Plastic Paradox', where plastic waste in the ocean is only a fraction of what has been littered.
Scientists have developed a new method to enhance electron-photon coupling, resulting in a hundredfold increase in light emissions. The approach uses a specially designed photonic crystal to produce stronger interactions between photons and electrons.
Researchers at MIT developed a new sensor that converts light into a magnetic signal detectable by MRI, allowing for the mapping of light distribution in tissue. This breakthrough has implications for optogenetic experiments and monitoring patients receiving light-based therapies for cancer treatment.
Researchers use novel interferometric technique to measure time delay between H2 and D2 isotopes, finding phase shift of nearly 3 attoseconds caused by nuclear motion. The study uses high harmonic generation and advanced theoretical modeling to validate the method.
Researchers found that germicidal UV lamps can significantly decrease SARS-CoV-2 virus transmission risk, but also produce secondary VOCs and particulate matter, impacting indoor air quality. The study recommends using GUV systems in high-risk environments where benefits outweigh drawbacks.
A team of researchers from Synchrotron SOLEIL, France, and Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Germany, has successfully demonstrated a free-electron laser driven by plasma acceleration and seeded by additional light pulses. This achievement could lead to the development of more compact and affordable FEL systems.
Researchers have developed a metal-free photon upconversion system that transforms readily available visible light into UVB photons, enabling sustainable photochemical processes. The breakthrough enables efficient generation of high-energy UV photons without relying on mercury lamps or other inefficient alternatives.
A recent human study published in Antioxidants found that consuming grapes protected against ultraviolet (UV) damage to the skin. The study showed increased resistance to sunburn and unique microbiomic and metabolomic profiles in subjects who consumed whole grape powder, suggesting a correlation between the gut and skin.
Researchers from LP3 Laboratory developed a light-based technique for local material processing in three-dimensional space of semiconductor chips. They successfully fabricated embedded structures inside Si and GaAs materials, which cannot be 3D processed with conventional ultrafast lasers.
Researchers at the University of Bonn have identified a new signaling pathway that triggers inflammatory responses in the skin after UV damage. This pathway involves the activation of p38 molecularly modifying NLRP1, a critical switch for inflammation, and initiates the assembly of inflammasomes.
Researchers have designed a transparent window coating that can lower building temperatures without using energy. The coating blocks UV and near-infrared light while transmitting visible light, potentially reducing cooling energy consumption by 31% in hot cities.
Researchers at Göttingen University have found fluorescent color patterns in fossils from the Triassic period, making them the oldest of their kind. The study reveals a surprising variety of stripes, zigzags, and flame patterns, similar to those of modern seashells.
A europium-based thin-film coating has been developed to convert UV light to red light, accelerating plant growth. The technology was tested on Swiss chard plants and Japanese larch trees, showing a 1.2-1.4 times greater plant height and biomass in winter conditions.
A research team at UNIST has developed a perovskite-silicon tandem solar cell with a special textured anti-reflective coating, increasing its power conversion efficiency to 23.50%. The device maintains its initial efficiency for 120 hours, outperforming existing devices which drop to 50% after 20 hours.
Researchers compiled 41 solar occultation observations of Saturn's rings from the Cassini mission to inform future investigations into their formation and evolution. The study reveals new information on ring particles' sizes and compositions, shedding light on the origins of the ring system.
The developed high-performance disposable photodetectors can accurately monitor exposure to UV radiation and prevent skin cancer. The devices are also conformal, enabling integration over non-planar surfaces for wearable dosimetry and environmental monitoring applications.
The study analyzed DNA methylation in skin tumor samples, revealing correlations between changes in proteins regulating the organism and prognosis. The results identified potential markers of patient survival and suggested a new route for understanding melanoma subtypes.
Researchers find that airborne chemical methyl bromide is a compelling indicator of biological activity on other planets. Its detectability increases around M dwarf stars, making it an attractive target for future missions to search for extraterrestrial life.
Researchers at the University of Turku discovered that hackmanite changes color when exposed to nuclear radiation, retaining a memory trace that allows it to be reused. This unique property enables the development of reusable radiochromic films for measuring radiation doses and mapping dose distribution.
A new study finds that climate data, particularly UV radiation levels, can help accurately model the spread of COVID-19. The research analyzed data from 196 countries and found that high UV radiation levels are strongly associated with reduced COVID-19 transmission rates.
A research team has developed a novel interferometer to investigate the ultrafast temporal evolution of coherence between electronic states coupled with nuclear dynamics in a molecule. The interferometer resolves attosecond optical and quantum interference, enabling studies of molecular dynamics.
Researchers developed a light-based therapy, photodynamic therapy (aPDT), to combat antibiotic-resistant bacteria. The treatment showed promise in weakening bacteria, allowing lower doses of current antibiotics to effectively eliminate them.
Researchers successfully demonstrate room-temperature multiband microlasers spanning a large wavelength range using rare earth elements. The lasing process combines downshifting and upconversion, expanding the emission wavelength range. The resulting microlasers exhibit good intensity stability and are suitable for practical applications.
A team of researchers, including atmospheric chemists from the University of Pennsylvania, identified a novel pathway for sulfur particle formation in Venus' atmosphere. This new understanding sheds light on the source of ultraviolet-absorbing emissions and offers cautionary notes for geoengineering efforts.
Researchers at the University of São Paulo found that deactivating the light-sensitive protein melanopsin slows melanoma progression in animal experiments. The study, published in Communications Biology, suggests that melanopsin acts as an oncogene in melanoma, a type of skin cancer.
A research group from Tokyo University of Science has discovered molecular features that govern the filling process at nanoscales, enabling finer resolutions in ultraviolet nanoimprint lithography. The findings provide valuable insights for guiding the selection and design of optimized resists for sub-10 nm resolution.
Researchers at Pusan National University have developed a novel method to measure oxygen concentration in high-temperature environments without physical contact. The method uses a phosphorescent material that varies its phosphorescence depending on the surrounding oxygen concentration.
A team of researchers found that the internal donut-shaped structure of quasars can affect the ionization level of intergalactic gas in different directions. The study suggests that a dust torus is likely to be responsible for this anisotropic effect.
Researchers propose a roadmap for developing reproducible human-free sunscreen testing, reducing ethical concerns and increasing innovation in sunscreen development. The Australian Radiation Protection and Nuclear Safety Agency and Cancer Council Victoria support the shift, emphasizing the importance of sun protection and prevention.
A large, all-season ozone hole has been detected over tropical regions, with an area seven times greater than the Antarctic ozone hole. The discovery highlights the need for further research on ozone depletion and its impact on human health and ecosystems.
Researchers reveal the likely composition of Charon's dynamic methane atmosphere and propose a possible source for its red polar zone. The team's novel experiments and atmospheric modeling suggest that ultraviolet light breaking down methane molecules is key to understanding the moon's unique albedo.
Researchers identified DNA damage-inducible transcript 4 (DDIT4) as a critical factor regulated by histone deacetylase 4 (HDAC4) in skin aging. Overexpression of HDAC4 rescued cells from senescence, while DDIT4 overexpression reversed changes associated with aging.
A KAUST-led team developed organic semiconductor-based photocatalysts to store solar energy as clean hydrogen fuel. These catalysts can absorb visible light and generate long-lived charges, improving efficiency for hydrogen evolution.
A randomized, placebo-controlled pilot study found that NB-UVB phototherapy decreased mortality in hospitalized COVID-19 patients with no adverse events reported. The treatment was effective in both vaccinated and unvaccinated patients, with reduced pathologic inflammation and improved intracellular killing of pathogens.
Researchers at UC Riverside discover that adding iodide to a water treatment reactor using ultraviolet (UV) light and sulfite can destroy up to 90% of PFAS chemicals in just a few hours. This method accelerates the reaction four times, saving energy and chemicals, and enables the treatment of ten times higher concentrations of PFAS.
Researchers at Medical University of South Carolina found that blocking the enzyme polymerase reduces the virus's ability to multiply. This discovery exposes an Achilles' heel that could be targeted with a therapeutic. Polymerase is a key tool for DNA replication and repair, making the virus vulnerable to disruption.
Researchers at Binghamton University have developed a system that kills SARS-CoV-2 viruses using UVC light, with optimal results achieved between 260-280 nanometers. The study's findings provide a scientific basis for standardizing and regulating claims from manufacturers of UV disinfectant devices.
Researchers found that normal-appearing lupus skin contains the same inflammatory signals as skin with rashes, suggesting a primed state for inflammation. The study's findings provide new insights into how UV light triggers rashes in lupus patients and highlight the potential for precision medicine in treating the disease.
Researchers have developed a method to control the rotational states of chiral molecules, allowing for specific separation of enantiomers. By irradiating chiral molecules with UV radiation and microwaves, the team has gained more control over which 'hand' is in which state.
Researchers developed micro-sized machines utilizing swarming strategy for cargo delivery, outperforming single robots with efficiency of up to five times. The team created a swarm of cooperating robots that can divide workload and respond to risks, expanding potential uses for microrobots.