A nationwide analysis of 192 commercial tea samples reveals differences among tea varieties and regions. The study found measurable PCBs in all samples, but health risk calculations indicated that PCB exposure from drinking Chinese tea is currently unlikely to pose an appreciable health risk to consumers.
A team of Penn State researchers has developed a synthetic enzyme mimic that can drive chemical reactions using oxygen, producing only water as waste. This breakthrough could potentially be used in sustainable industrial chemical syntheses and pharmaceutical drug development.
The study found that gestational exposure to 10 classes of priority chemicals was associated with differences in gestational age at birth and lower birth weight-for-gestational age z scores. Reducing exposure to these chemicals could promote healthy deliveries and better child outcomes.
Methanol-to-hydrocarbons reactions exhibit multiscale heterogeneity due to differences in molecular diffusion, crystal structure, particle composition, and reactor conditions. This nonuniformity affects catalyst performance and product selectivity.
The Organometallic Chemistry and Homogeneous Catalysis group develops multisensitive catalysts with switchable properties using naphthalene diimides and N-heterocyclic carbenes. This simplifies catalyst optimisation, enabling a single catalyst to facilitate various chemical transformations.
Researchers developed three process designs that capture higher value hydrocarbons during LNG regasification using seawater, with one configuration delivering strong economic performance. The study also highlights environmental advantages by reducing carbon dioxide emissions and improving overall efficiency.
Researchers developed a highly efficient cell-free enzyme system that achieves remarkable increases in catalytic performance, reduces cofactor consumption, and produces high yields of 1-alkenes. The system overcomes challenges of whole-cell biocatalysts by mimicking the biological reaction environment.
Researchers from The University of Osaka develop a groundbreaking synthetic method to incorporate boron-rich carboranes into aromatic compounds, eliminating complex steps and hazardous conditions. This 'dump-and-stir' technique enables large-scale production using inexpensive aryl bromides and chlorides.
Researchers at KAUST have developed a new method for separating valuable hydrocarbons from crude oil using hollow molecules called cucurbiturils. These 'molecular sieves' can efficiently capture and isolate specific hydrocarbons, reducing the need for energy-intensive distillation processes.
A new nickel-based catalyst has been developed to produce valuable liquid hydrocarbons from carbon dioxide, a key component in fuels like gasoline and jet fuel. The research shows that the catalyst can selectively promote the production of branched hydrocarbons, which are ideal for high-performance fuels.
Researchers at Colorado State University have developed a more efficient light-based process for transforming fossil fuels into useful modern chemicals, effective even at room temperatures. The organic photoredox catalysis system uses visible light to alter chemical compounds, reducing energy demands and pollution in various industries.
Scientists from Institute of Science Tokyo successfully solubilize porous aromatic polymers (PAPs) in water using aromatic micelles, forming giant polycavity materials with high incorporation functions. The method enables the preparation of rare multi-component materials with potential applications in advanced functional materials.
Researchers Garett Sansom and Lindsay Sansom will evaluate soil conditions in Settegast and Lakewood neighborhoods for cancer-causing heavy metals and polycyclic aromatic hydrocarbons. The project aims to identify residents' environment-related concerns and develop a better understanding of local priorities and challenges.
Researchers at the University of Minnesota discovered a new method to selectively burn one molecule in a mixture of hydrocarbons using a bismuth oxide catalyst. This process, called chemical looping combustion, could help remove pollutants and improve industrial processes with high energy efficiency.
The new method enables accurate detection of polycyclic aromatic hydrocarbons (PAHs) and their derivatives (PACs) in placental samples, providing critical insights into maternal and fetal health. This breakthrough could inform public health measures and improve fetal and maternal health outcomes.
Researchers at the University of Cambridge and the University of California, Berkeley have developed a practical way to produce hydrocarbons from carbon dioxide using copper nano-flowers on artificial leaves. The device produces more complex hydrocarbons with two carbon atoms, such as ethane and ethylene, which are key building blocks ...
Researchers at Nagoya University have developed a novel fuel cell electrolyte concept using phosphonic acid polymers with hydrocarbon spacers. The new membrane exhibits improved water insolubility, chemical stability and conductivity under high-temperature and low-humidity conditions.
A multidisciplinary team monitored ambient PAHs levels in Beijing from 2014 to 2021, finding a 96.6% decline in concentrations. The study also showed that air pollution control measures reduced human exposure to airborne toxins like PAHs.
Researchers have discovered unusual, Earth-size magnetically driven vortices generating dense, hydrocarbon haze at Jupiter's poles. The dark ovals hint at strong interactions between the planet's magnetic field and atmosphere.
Researchers identified two microbe strains capable of degrading petroleum hydrocarbons, holding promise for treating contaminated marine oil spills. These microorganisms also exhibit potential to reduce the toxicity of oily wastewater, offering a sustainable solution for environmental remediation.
A team at MIT discovered pyrene, a large carbon-containing molecule, in a distant interstellar cloud. The finding supports the PAH hypothesis and suggests that pyrene may have contributed to the formation of our solar system's chemical inventory.
Hokkaido University researchers have developed a novel method to activate alkanes, making it easier to convert these building blocks into valuable compounds. The new technique utilizes confined chiral Brønsted acids, improving efficiency and selectivity in producing desired products.
Researchers engineered bacteria-yeast hybrids to perform photosynthetic carbon assimilation, generating cellular energy without traditional carbon feedstocks. The hybrids can produce important hydrocarbons, paving new biotechnical pathways to non-petroleum-based energy and synthetic biology applications.
Researchers discovered that the iron nitrogenase can convert CO2 into methane and formic acid, making it a promising starting point for developing novel CO2 reductases. The enzyme's low selectivity for CO2 also suggests its potential for widespread use in nature.
Researchers at the University of Illinois developed an eco-friendly method to precisely mix fluorine into olefins using natural enzymes and light, offering a more efficient strategy for creating high-value chemicals with potential applications in agriculture, pharmaceuticals, renewable fuels and more.
Researchers develop an artificial fusion protein combining UndB with catalase, creating a whole cell biocatalyst that converts fatty acids to alkenes with high efficiency. The biocatalyst produces pure 1-alkene as a valuable biofuel and can be used to generate a large number of hydrocarbons.
The MIRI Mid-INfrared Disk Survey (MINDS) discovered a large variety of carbon-rich gases in the disk surrounding a very low-mass star. This finding suggests that rocky planets with Earth-like characteristics may form more efficiently than Jupiter-like gas giants in such disks.
A new study found that pregnant women with lower socioeconomic status are exposed to higher levels of thyroid-disrupting chemicals, particularly polyaromatic hydrocarbons. This increased exposure has the potential to worsen health disparities among low-income populations.
A novel multifunctional catalyst has been developed to convert methane into valuable hydrocarbons, reducing greenhouse gas emissions and energy consumption. The catalyst's spatial distribution of Cu and acid sites determines the final products, with uniform distribution leading to stable and efficient methanol production.
Chemists develop new reactions using model systems and substrates to demonstrate versatility. A new computer-aided method reduces subjective bias by analyzing real pharmaceutical compounds' complexity and structural properties. This improves data quality and facilitates machine learning applications.
Researchers at Doshisha University have developed a new method to electrochemically synthesize acetylene from carbon dioxide and water, using high-temperature molten salts and metal carbides. This approach offers advantages over conventional synthesis pathways, including the direct use of CO2 as feedstock and reusable electrodes.
Researchers have developed a simple and sustainable method for monitoring and degrading a mixture of polycyclic aromatic hydrocarbons (PAHs) in water. The new approach uses excitation-emission matrix fluorescence spectroscopy and photochemical systems to achieve efficient degradation, outperforming traditional methods like chromatography.
Scientists at the University of California, Davis, have successfully synthesized specific chiral molecules using rearrangements of simple hydrocarbons and complex organic catalysts. This breakthrough enables better harnessing of hydrocarbons for various purposes, including precursors to medicines and materials.
Researchers have found that Titan's 'magic islands' are likely formed by floating chunks of porous, frozen organic solids, explaining their ephemeral nature. The discovery sheds light on the fate of simple organics on Titan's surface and provides insights into the moon's unique environment.
New research finds that PAHs in wildfire smoke can persist on indoor materials for weeks, posing health risks. Effective household cleaning techniques, such as laundering cotton and using glass cleaners, can significantly reduce exposure.
A study found polycyclic aromatic hydrocarbons (PAHs) in Southern Resident killer whales and Bigg's killer whales off the coast of B.C., with contaminants from oil spills and wildfire smoke. The presence of PAHs suggests recent exposures to toxic chemicals, emphasizing the need for improved pollution management.
Researchers at the University of California - Berkeley have developed a simple and green way to convert flared natural gas into economically valuable liquids, mostly alcohols like methanol and ethanol. The process utilizes a porous metal-organic framework (MOF) that mimics the oxygenation reaction in plants and animals.
Researchers at King Abdullah University of Science & Technology have developed organic solar cells with record efficiencies and discovered a link between molecular structure and outdoor stability. The study found that fluorine-bearing functional end groups and long hydrocarbon side-chains enhance outdoor stability, protecting the cells...
Scientists have discovered a simple test for signs of past or present life on other planets, using artificial intelligence to distinguish between biological and abiotic samples with high accuracy. The method has the potential to revolutionize the search for extraterrestrial life and deepen our understanding of Earth's earliest life.
Mainz University and Evonik researchers have created an environmentally friendly process to generate dicarboxylic acids, a crucial chemical building block for polyamides. The new technique uses only oxygen, electricity, and hydrocarbon compounds, eliminating heavy metals and strong acids, and resulting in no nitrogen oxide emissions.
Researchers have made a significant advancement in the synthesis of β-lactam scaffolds, structural components frequently found in essential antibiotics. The breakthrough uses nickel catalysts to overcome challenges in β-lactam synthesis, enabling more efficient and simplified production of high-value materials.
A study published in Science of the Total Environment found that biofiltration increased coho salmon hatchling survival by up to 87%, reducing mortality from stormwater runoff exposure. The method effectively removes contaminants, but implementation faces hurdles due to land requirements.
Female beewolves release toxic nitric oxide to kill mold fungi in brood cells, but their symbiotic bacteria are protected by hydrocarbons secreted from their antennae. These hydrocarbons block the diffusion of nitric oxide and prevent bacterial harm.
Researchers used X-ray photocrystallography to study the transition metal-nitrenoid intermediate in catalytic amination reactions. The team successfully captured the structure and properties of the rhodium-acylnitrenoid intermediate, providing crucial insights into its reactivity.
A recent study by Kyoto University has raised concerns about the authenticity of Big Oil's net-zero emissions claims. The research team found that oil majors are not making sufficient progress in phasing out fossil fuels and transitioning to clean energy, despite their pledges to achieve net-zero by 2050.
Researchers at Cornell University have developed a novel strategy for making recyclable polyolefins by introducing masked double bonds, known as 'Trojan horse' functional groups. These polymers can be chemically deconstructed and re-polymerized without losing quality.
SourceWiley·JournalAngewandte Chemie International Edition·TypeExperimental study·DateJun 19, 2023
Researchers have detected complex organic molecules in a galaxy more than 12 billion light-years away from Earth. The study used the James Webb Space Telescope and gravitational lensing to observe the galaxy's atomic and molecular composition, revealing insights into the formation of galaxies, their lifecycle, and how they evolve.
University of Houston researchers have created digital applications to enhance energy efficiency, including calculators for hydrocarbon MMP, carbon dioxide MMP, and viscosity. These tools offer significantly higher accuracy than current methods, helping engineers save time and resources.
Research published in BMJ Open suggests a strong association between environmental polycyclic aromatic hydrocarbons (PAH) and the risk of developing rheumatoid arthritis. PAH exposure was found to account for most of smoking's impact on this disease risk, with one specific compound, 1-hydroxynaphthalene, showing a strong association.
Researchers have developed an electrolyte to improve the efficiency of CO2 conversion into useful hydrocarbons. The study found that controlling the concentration of the electrolyte is crucial in regulating product formation, with too much potassium leading to clogage and reduced selectivity.
The study analyzed the growth and productivity of Botryococcus terribilis under different cultivation systems. Stress increased the production of lipids and hydrocarbons by 49% and 29%, respectively, while proteins decreased. The microalgae's metabolites have potential applications in biofuel synthesis, cosmetics, and food.
Researchers at Brookhaven National Laboratory have produced the first atomic-level structure of an enzyme that selectively breaks carbon-hydrogen bonds, suggesting ways to engineer it for producing desired products. The detailed structure reveals how the enzyme operates under ordinary conditions and produces few unwanted byproducts.
A study by University of Gothenburg found that conifer trees are generally better at purifying air from gaseous pollutants, while broadleaved trees excel at capturing particle-bound pollution. The researchers analyzed leaves and needles from eleven different tree species to determine which ones absorb air pollutants most effectively.
Researchers developed a new catalyst that transforms hydrocarbons into higher-value chemicals, making materials easier to recycle and biodegrade. The catalyst introduces functional groups into aliphatic hydrocarbons, affecting their properties and making them recyclable.
Scientists at Helmholtz-Zentrum Berlin examined the chemistry of Cobalt-Iron Oxyhydroxides using X-ray absorption spectroscopy. They discovered that iron is present in higher oxidation states than previously thought, which could lead to improved electrocatalysts for water splitting and carbon dioxide reduction.
A team of researchers has identified the importance of rifted margins in the transition to a green economy. These continental margins harbor vast accumulations of rocks and hydrocarbon reserves, making them a potential location for new resources needed for a carbon-neutral economy. The study provides an overview of the processes that s...
Researchers at Boston College have developed a new catalytic approach that enables concurrent control of multiple convergences and selectivities in intermolecular amination of allylic carbon-hydrogen bonds in alkenes. The cobalt-based system exploits unique features of homolytic radical reaction to form desired amine products in a high...
The study reveals that N,N-dimethylformamide (DMF) separates carbazole and anthracene due to strong intermolecular hydrogen bonds. Researchers used advanced liquid-state NMR techniques to analyze the interaction mechanism, finding a C=O···H-N bond between DMF and carbazole.
G-Quadruplex DNA structures play a crucial role in regulating genes and cell processes, but their visualization is challenging due to the dynamic nature of double standard DNA. Fluorescence-active small molecule probes have emerged as a real-time visualization method, enabling researchers to detect G-quadruplexes with high selectivity.
A KAUST research team studied the interaction between nitrogen gas and hydrocarbons in oil reservoirs. They found a direct correlation between nitrogen solubility and oil swelling, enhancing oil recovery. The study also sheds light on CO2 storage with impurities like methane and nitrogen.