Articles tagged with Isotopes
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Michigan State University researchers have measured the nuclei of three protein-rich calcium isotopes, revealing unique patterns in their charge radii. The findings, which challenge existing theories, are attributed to a better understanding of proton interactions at large distances outside the nucleus.
A Northwestern University team found that southern Greenland's climate was relatively warm when the Norse lived there between 985 and 1450 C.E., about 1.5-degrees Celsius warmer than surrounding cooling centuries.
Scientists at Tokyo Institute of Technology developed a new model to predict nuclear fission reaction products, resolving a long-standing mystery. The 4D Langevin equations model successfully accounts for the effects of fragment shapes on fission products and kinetic energy.
Researchers have revised the history of big, climate-altering volcanic eruptions using a new method that accurately identifies airborne particles in Antarctic ice cores. The study confirms many events and corrects misidentifications, revealing new information on large stratospheric eruptions over the past 2,600 years.
Scientists developed an electron microscopy technique to directly identify isotopes in amino acids at the nanoscale without damaging the samples. This allows for real-space observation of dynamic chemistry and creates a foundation for scientific discoveries.
New evidence from stable isotopes in ancient panda bones indicates they likely had a varied diet, similar to that of other mammalian species. The researchers found that ancient pandas were isotopically distinct from modern giant pandas, suggesting differences in their dietary habits and a wider niche than previously thought.
A recent study from Arizona State University uses breath and hair analysis to understand metabolism and calories burned during exercise. The results show that people burn fat in the morning and switch to burning carbohydrates during moderate exercise, regardless of their diet.
Researchers at Duke University have discovered that fish ear bones can serve as a fingerprint for identifying and tracking coal ash contamination in aquatic ecosystems. The study used strontium isotope ratios in otoliths to connect high levels of toxic elements back to the contamination source.
A study found a significant increase in dust in northern Iran around 4,200 years ago, suggesting a period of drying and relatively arid climate conditions. This event coincided with the decline of the Akkadian Empire and the abandonment of North Mesopotamian settlements.
Researchers investigate pion condensation in neutron-rich tin isotope, finding critical density of around two times normal nuclear density. The discovery provides new insights into rapid cooling process of neutron star cores.
Researchers analyzed magnesium stable isotopes in lunar rock samples, finding they match the Inner Solar System's bulk composition before fractionation occurred. The results suggest the initial Moon impact did not separate isotopes and instead indicate a lunar magma ocean that re-melted and affected later basalt formations.
Researchers discovered two early hominin species coexisted in southern East African Rift system, displaying dietary generalism and adaptability to paleoenvironmental conditions. The results suggest a high degree of versatility in their ability to thrive in various environments.
FIONA's first results confirm predictions for the mass numbers of moscovium and nihonium, two superheavy elements. The tool provides a reliable way to measure these numbers with experiments, addressing potential issues with nuclear mass models.
Physicists at Johannes Gutenberg University Mainz have successfully measured parity violation in ytterbium atoms with different numbers of neutrons, confirming the predictions of the Standard Model of particle physics. The results show that the effect increases with the number of neutrons in the nucleus.
A 9,000-year-old child's tooth has revealed insights into Alaska's ancient people, their genetic makeup and diets. The tooth, linked to the Ancient Beringian lineage, indicates that these groups remained in Alaska for thousands of years after migrating across the Bering Land Bridge.
Researchers at UC are using isotopic analysis to identify the habitats of migratory hawk species. By analyzing the strontium and hydrogen isotopes in feathers, they can determine the geographic origin of individual birds, providing valuable insights for conservation efforts.
Researchers analyzed 23 popular hard ciders and found that 60% of domestic brands contained added sugars from cane or corn syrup. The study's findings suggest that labels are not a reliable way to determine whether a cider has added sugar, due to discrepancies between expected and observed isotopic ratios.
Researchers used chromium isotopes to investigate the conditions under which the Moon's volatile elements evaporated. They found that the temperature of evaporation was around 1600-1800 K, significantly lower than previously thought if evaporation occurred during the giant Moon-forming impact.
Recent research suggests that anthropogenic nitrogen inputs to the North Atlantic may be lower than previously thought. Coral skeletons show minimal changes in nitrogen isotope ratio over the past 130 years, contradicting model simulations predicting a significant decline.
The binding energy of near proton-drip line Z = 22-28 isotopes has been determined from measured isotopic cross section distributions. The predicted binding energies were verified through the scaling phenomenon of mirror nuclei, confirming the reliability of the method.
Researchers analyzed silicon and oxygen isotopes in zircon crystals to infer the presence of sedimentary rocks, such as cherts or banded iron formations, on early Earth. The findings suggest that these rocks may have existed over 4 billion years ago, providing a window into the planet's primordial chemistry.
Researchers reconstructed a drastic climate change event in southern France using tree-ring width measurements and chemical analyses. They found that the region experienced increased air mass transport from the North Atlantic and regional variability in precipitation, leading to extreme weather conditions.
Researchers analyzed animal fat residues to link a 8,200-year-old climate shift in Greenland with changes in a human settlement. The study found correlations between the climate event and shifts from cattle herding to goat herding and changes in dwelling structures, ultimately leading to settlement abandonment.
Scientists have found significant concentrations of fission products, including barium isotopes, within ruthenium metal and sulfide aggregates at the Oklo reactor site. The discovery suggests that these aggregates formed approximately five years after reactor shutdown, with potential implications for nuclear waste storage.
A new study reveals that chimpanzees in the savannah consume tougher and less digestible food than those in the rainforest. The researchers found that the outer casing of certain fruits had higher toughness values, suggesting that the chimps' teeth evolved to handle these more challenging foods.
A new study published in Proceedings of the National Academy of Sciences reveals a previously unknown sulfur isotope effect that helps identify sources of air pollution in China. The researchers used sulfur isotopes to analyze coal and air samples, finding a connection between biomass burning and aerosol formation.
A new study suggests that organic materials found in ancient meteorites formed through basic chemical reactions during the Solar System's infancy. The research provides insights into the potential habitability of other planetary systems.
A University of Oxford study suggests that some people buried at Stonehenge had moved with and transported bluestones from the Preseli Mountains in west Wales. The research combined radiocarbon-dating with new developments in archaeological analysis to investigate the lives of those buried at the iconic monument.
Researchers measured isotopes of water trapped in gypsum to determine changes in rainfall and relative humidity during the Maya downfall. Annual precipitation decreased by 41-54% and relative humidity declined by 2-7%. These findings support theories that drought contributed to the Maya civilization's collapse.
A new study analyzed speleothems in Brazilian caves to reconstruct rainfall distribution during the Middle Ages. The research found that southwestern Brazil was wetter than now, while the Northeast region was drier. This analysis provides insights into the climate changes that occurred during the Little Ice Age.
Researchers successfully measured the optical excitation of atomic levels in nobelium isotopes using laser spectroscopy. The results confirm that nobelium nuclei are deformed like an American football, with a lower charge density in their center than at their surface.
A new study challenges the long-held assumption that plant-eating mammals' diets can be determined by analyzing carbon isotopes in fossil teeth. The researchers found that the value of these isotope analyses changes with body size, leading to a more accurate understanding of extinct species and ecosystems.
A MSU chemistry professor has been awarded a $356,598 grant to develop new methods for gathering rare medical isotopes. The goal is to enable targeted alpha therapy for metastatic cancer and advance research in fields like astrophysics and biochemistry.
Researchers analyzed a 200-year sediment core from a Himalayan lake, finding increased sulfate concentrations starting at the end of the Second Industrial Revolution. The findings suggest that atmospheric sulfur isotope ratios in the region were influenced by pre-industrial biomass burning and post-1930 anthropogenic dust emissions.
Researchers confirm painted lady butterflies recolonize Mediterranean region from Afrotropics each spring, traveling 12,000 km across Sahara Desert. The species' annual distance traveled may reach up to 24,000 km, closing the loop for its migratory system.
Researchers have overturned centuries-old thought on the source of ancient turquoise used by Aztec and Mixtec civilizations in Mesoamerica. Geochemical analyses reveal that true geologic source lies within Mesoamerica, not the American Southwest.
Researchers probe Periodic Table's limits as new elements are added, challenging traditional understanding of atoms. The search for element 119 continues, with potential implications for the definition and structure of atoms.
Chemical analysis of rat remains from Polynesian islands shows changes humans made to local ecosystems, including native species extinctions and alterations to food webs. The study advances a new method for detecting human transformations of local ecosystems in the past.
Researchers found evidence that the Earth's continental crust could have formed hundreds of millions of years earlier than previously thought, suggesting a habitable environment for life. The study used unique instruments to count strontium atoms in ancient rocks and found silica presence, altering the classic view of early Earth.
A study of ancient rat remains from Polynesia finds that isotopic trends reflect resource depression and reshaping of nutrient flows by early human settlers. The declines may be due to changes in food sources, such as a shift from slash-and-burn agriculture to agroforestry and nearshore fishing.
Researchers developed a new method to identify microbe food sources using carbon stable isotope ratios, providing insights into microbial communities and their impact on animal and plant health. The technique uses mass spectrometry and software to link microbes with substrates, enabling the study of complex microbial relationships.
A study found that female leopards have a significantly wider diet range than males, with a greater diversity of smaller prey species. This is thought to be due to the energy constraints and limited home ranges of females.
Researchers at Osaka University have identified a carbon isotope with a magic number of six, demonstrating improved stability and understanding of spin-orbit coupling in atomic nuclei. This breakthrough provides new insights into the origin of spin-orbit force and magic numbers of nuclei.
Researchers used laser ablation and plasma mass spectrometry to analyze ancient gold items from the Carambolo treasure, discovering a local gold deposit within 2 km of the site. This breakthrough provides new insights into the origin of the metal and its possible connections to ancient trade routes.
Researchers at MIT have developed a physics-based system to verify the destruction of nuclear warheads, using cryptographic keys in physical form. The new method uses neutron detection and resonance processes to identify authentic warheads, while concealing their designs.
A recent study published in Scientific Reports found that a series of volcanic eruptions in the mid-500s CE resulted in a prolonged period of cold and darkness, making it difficult for humans to survive. The poor climate conditions significantly reduced food production and vitamin D levels, further weakening the already hungry population.
A researcher is exploring the emergence, transmission, and intensification of mobile pastoralism across the Eurasian steppe. The project will analyze human and animal bones, teeth, pottery, and other remains to understand how people relied on sheep, goats, cattle, and horses for food.
Researchers found a small but measurable difference in oxygen isotopes between lunar and terrestrial rocks, proposing that most of Earth's water was acquired during the main stage of its growth. This challenges the widely accepted theory that the Moon formed from debris left over after a giant impact.
New research analyzing oxygen isotopic compositions of lunar and terrestrial samples supports a high-energy collision model for the Moon's origin. Most of Earth's water is believed to have been delivered before the Moon-forming impact, contradicting previous proposals that it was added later.
A new study suggests that Silk Road cities had limited and monotonous diets, while nomadic communities enjoyed a diverse smorgasbord of foods. Researchers used isotopic analysis of human bones to unlock information about ancient dietary regimens.
Researchers analyzed sedimentary rocks and found light lithium isotopes in South China's seawater, potentially linking terrestrial and marine ecological crises. The findings suggest a connection between the Siberian Traps' eruptions and the Permian-Triassic mass extinction event.
Researchers analyzed ancient animal remains from Ceibal, Guatemala, revealing widespread Maya animal management earlier than thought. The findings suggest that captive animals played a significant role in the development of state society among the Maya.
Researchers analyzed animal remains from Ceibal, Guatemala, and found that dogs, turkeys, and cats were raised for ceremonial purposes, with dogs being traded across the landscape. The study sheds light on the role of animals in Maya civilization and challenges previous assumptions about their management.
Research at the Ii Hamina cemetery found that the diet of medieval residents consisted mainly of fish, with 70% of protein consumption attributed to fish-based food. This suggests a strong reliance on waterways and an underemphasis on farming and dairying in the region.
Researchers used carbon isotopes to track shark feeding habits, finding that coastal sharks forage in a range of coastal food webs, while deeper ocean sharks rely on specific areas of colder water. The findings may help conservationists design more effective protection strategies for declining shark populations.
Scientists analyzed carbon-rich dust grains extracted from meteorites to determine the timing of supernova dust formation. The study found that these grains formed at least two years after their massive parent stars exploded.
Researchers have successfully implanted protons into iron-based superconductors, inducing bulk superconductivity with Tc at 20 K. Protonation also enhances Tc in FeS, overcoming the difficulty of lacking sensitive NMR isotopes.
Researchers at NRL have developed a method to reduce optical losses in hexagonal boron nitride devices, enabling more efficient lasers and nanoscale optics. This breakthrough has significant applications for ultra-high resolution microscopes, solar energy harvesting, optical computing, and targeted medical therapies.
A team of researchers has successfully developed a novel method for separating isotopes using a flexible porous material. By exploiting the dynamic change in pore dimensions, they can selectively adsorb and desorb desired gas components, leading to improved separation efficiency and selectivity.
Researchers found high methane concentrations in groundwater near a 1965 gas well blowout site in the Netherlands, suggesting ongoing methane leakage from the reservoir. Methane oxidation reduced isotope concentrations with increasing distance from the blowout site.