Articles tagged with Isotopes
Microbes adapted to living with oxygen around 2.7 billion years ago, as indicated by changes in fossil isotopes of carbon in rocks from the late Archean period in Western Australia. This finding supports the idea that oxygen-producing photosynthesis evolved and enriched the atmosphere over time.
Researchers observed atomic decay patterns to establish the existence of element 118, producing previously unknown isotopes. The discovery brings the total number of new elements discovered by the Livermore-Dubna collaboration to five.
Researchers have developed a way to image cell membranes with record resolution, shedding light on their chemical composition and organization. This breakthrough allows for high-sensitivity analysis of biological samples on a nanoscale, providing new insights into cellular function and behavior.
Monazite crystals contain thorium and can be used to date rocks altered by high-temperature fluids. In a new study, researchers found that monazite dissolves readily in hydrothermal fluids, resetting its clock and allowing for accurate dating of affected areas.
Researchers from Alfred Wegener Institute and L-DEO have determined the temporal variability of helium flux between glacial and interglacial periods using an Antarctic ice core. The study reveals a marked difference in terrestrial dust composition during the last Ice Age versus current warm period, with implications for climate archives.
A study of tropical ice cores found two significant climate shifts: one around 5,000 years ago when temperatures cooled, and another more recent reversal to a warmer world. The research suggests most high-altitude glaciers in tropical regions will disappear in the near future due to rising temperatures.
Researchers have discovered that meteorites contain isotopes of nitrogen and hydrogen that are similar to those found in interplanetary dust particles. This suggests that the parent bodies of these meteorites, such as comets, formed in the interstellar medium and were not severely processed by the inner solar system.
Scientists are using lead isotope analysis to study ancient copper artifacts from sub-Saharan Africa, providing insights into the spread of Islam and trade patterns across the Sahara Desert. The analysis reveals that merchants traded gold from regions like present-day Niger for copper from North Africa via camel caravans.
Researchers have made the fastest measurements of molecular vibrations, using a new technique that detects UV photons emitted by molecules under laser pulses. The results show atomic nuclei moving at varying speeds in different isotopes, providing insights into molecular dynamics.
Researchers used recent meteorological data to simulate condensation cycles, finding that temperature differences across Antarctica explain isotope value variations but with strong spatial correlations. Climate signals stored in Antarctic snow are not representative of annual weather conditions.
Research suggests that changes in wetland systematics and natural gas emissions during the glacial period may be responsible for elevated methane levels. The study analyzed ice core samples from Greenland, finding no evidence of clathrates releasing methane into the atmosphere.
African remains found in Campeche, Mexico, provide earliest physical link between the African Diaspora and the New World. The discovery, dating back to the late-16th century, sheds light on the early transatlantic slave trade.
Researchers analyzed chemicals in elephant tail hair to determine their diet and movements, revealing the need for secure habitats to protect endangered species. The study aims to inform land use planning and minimize conflicts between humans and elephants.
The American Geosciences Institute announced the winners of its Earth Science Week 2005 contests. James Pugh won the Visual Art Contest with his drawing 'Volcanologists: It's a Hot Job,' while Robert Kendle took home the Essay Contest prize for his essay on paleontology and geoscientist aspirations.
Researchers found that up to 70 percent of the water inside rapidly growing bacterial cells was generated by metabolism. This challenge to prevailing wisdom may lead to new methods for detecting fast-growing cancer cells or studying metabolic changes in obese individuals. The study's findings use stable isotope ratio mass spectrometry ...
Researchers studied isotope anomalies in rocks, ice cores, and atmospheric samples to understand the rise of oxygen in the atmosphere. They found that ultraviolet light from the Sun drove atmospheric evolution, leading to the formation of ozone that shields life on Earth.
Researchers at Michigan State University recreated a rare isotope of nickel called Ni-78, which existed briefly in the chain of events that formed elements. This breakthrough reveals that Ni-78 decays up to three times quicker than expected, changing models of element formation before Earth's creation.
Researchers have discovered evidence of large fluctuations in sea levels over thousands of years, not just during glacial periods, using a new method of dating corals. This finding suggests that sea levels may be more variable than previously thought, with changes occurring on shorter time scales.
Researchers use meteorite composition to test theories on solar system formation, shedding light on the sun's oxygen makeup. The Genesis spacecraft collected particles blown out from the sun, providing new insights into local variations in oxygen isotopes.
Researchers at Washington University in St. Louis have created a detailed map of the Comstock Lode, a 14-million-year-old gold and silver ore deposit. The map uses mathematical techniques to visualize patterns of oxygen isotope exchange between water and rock, providing insights into the geological processes that formed the ore district.
Researchers analyze over 59,000 grains from Acfer 094 meteorite and identify nine specks of silicate stardust. The discovery provides information about stellar sources, nuclear processes, and the physical and chemical compositions of stellar atmospheres.
Scientists have discovered that early oceans were devoid of oxygen for billions of years, with a team developing a method to detect signs of ancient oxygen in rocks. The study sheds light on the history of our planet's oceans and could have significant implications for understanding evolution and the origins of life.
A new study finds that declining winter habitats of migratory songbirds significantly affect their ability to reproduce. Researchers measured stable carbon isotopes in the birds' blood, revealing a 'food chain signature' tied to habitat quality.
Researchers are using stable isotopes in bird feathers to track migration patterns and wintering grounds, revealing previously unknown information about bird dispersal. This technique provides a faster and more cost-effective alternative to traditional methods like banding, allowing scientists to gather data on a wider scale.
Astronomers have successfully detected and measured the nitrogen-15 isotope in Comet LINEAR, revealing an isotopic abundance ratio of 140 ± 30. This finding provides crucial information about the composition of comets and their connection to heavier organic molecules, which are essential for life on Earth.
A team of scientists has resolved the long-standing mystery of hydrogen balance in the Earth's atmosphere by analyzing stratospheric air. The research reveals that the major sink for hydrogen is not as previously thought, but rather a complex interplay between atmospheric reactions and methane oxidation.
Researchers used lead isotope ratios to identify the source of lead poisoning in albatross chicks on Midway. The study found that chicks are eating paint chips directly, leading to high levels of toxic metal in their blood, causing symptoms like droopwing.
New research reveals that baby albatrosses are still eating lead-based paint chips from buildings around the island, leading to severe poisoning. The study found a high rate of droopwing chicks and potential risks for human children on the island.
A St. Louis chemist has developed innovative methods to spin and shape atomic nuclei, which can affect their decay rates. His team has achieved incredibly fast spin speeds, such as 2 million-billion-billion revolutions per second, using specialized instruments.
Researchers have discovered that coral layers in the Atlantic Ocean hold a key to understanding the region's climate dynamics. By analyzing calcium carbonate skeletons, Dr. Lisa Greer and her team found a periodic pattern of oxygen isotope composition with peaks every 12-15 years, mirroring sea surface temperature data.
Researchers used stable isotope assessment to determine that most late-season moths in the Cotton Belt are developing on non-cotton plants like corn, providing a major refuge for H. zea moths and helping to control pesticide-resistant pests.
A new radium isotope, radium223, has shown promise in treating skeletal metastases with less damage to bone marrow compared to traditional treatments. The isotope is incorporated into skeletal tissue via osteoclasts and emits radiation that kills cancer cells, providing pain relief and potentially improving quality of life.
Geologists analyzed rare rock samples from California and Oregon, which contain large amounts of osmium, a key element in the Earth's core. The findings suggest that these rocks came from hotspots at the core-mantle boundary, providing valuable clues to the Earth's core composition.
A team led by Hope Jahren found evidence that Axel Heilberg's forests received equatorial water and warmth from a prehistoric weather pattern. The discovery helps demystify the forest's existence near the North Pole, where sunlight and darkness last for four months each year.
A Johns Hopkins University senior has conducted original research that sheds new light on the identity of a 400-million-year-old organism. By comparing the fossil to modern relatives, the student found that the ancient specimen's chemistry more closely resembles that of lichens than previously thought.
Researchers analyzed carbon and hydrogen isotopes in black-throated blue warbler feathers to link northern breeding populations with southern wintering grounds. The study found a significant correlation between isotopic composition and geographical location.
A study analyzing stable isotopes in feathers reveals that black-throated blue warblers segregate according to their summer breeding locations in North America, linking them to specific Caribbean wintering grounds. This research provides crucial insights for developing effective conservation initiatives for Neotropical migrants.
A new theory suggests that an ancient supernova explosion may have devastated the Earth's ocean ecosystem, causing widespread extinction of plankton and marine organisms. The discovery was made by linking data from paleontology, geology, and astronomy fields.
Scientists have discovered a natural method to track Atlantic salmon using strontium isotopes, which can reveal the fish's origin and migration patterns. This discovery could provide valuable insights into salmon habitat restoration efforts and inform more effective conservation strategies.
A research team at Penn State discovered that consortia of bacteria and archaeobacteria consume up to 80% of marine methane, a potent greenhouse gas. The findings indicate that these microorganisms play a crucial role in regulating the Earth's climate.
Research on fossil Teleoceras teeth suggests a semi-aquatic lifestyle for the ancient rhinoceros, mirroring that of modern hippos. The study's findings indicate low variability in oxygen isotope compositions among aquatic mammals, contrasting with higher variability in land animals.
Researchers use oxygen isotope fingerprinting to uncover evidence of lost Asian emerald sources in antiquity, tracing gems from Pakistan, Afghanistan, and Colombia. The study reveals a significant role for the Spanish in introducing New World emeralds into Old World trade.
Researchers at University of Michigan have developed a new isotope-separation process using an ultrapowerful laser system that can deliver up to 1000 times more power than the entire electrical generating capability of the US. This technique provides a futuristic alternative to bulky methods and opens possibilities for preparing medica...
The new process uses a terawatt laser to deliver incredible energies in femtoseconds, sorting isotopes by molecular weight. This breakthrough eliminates the need for huge electro-magnets and cross-contaminated byproducts, making it an efficient alternative to gaseous diffusion.
Researchers at Max Planck Institute find collisions between light and heavy atoms favor ozone formation, advancing understanding of large isotope effect in heavy ozone. The discovery refutes molecular symmetry theories and highlights the role of specific reaction channels in ozone molecule production.
Henry N. Wagner Jr, a pioneer in nuclear medicine, has been awarded the Cassen Award for his pioneering work on tracking biochemical events within the living body using cyclotron isotopes. His research led to significant discoveries in brain chemistry and addiction, while also informing public health policy on radiation.
Researchers use strontium isotopes to identify salmon stream origins, allowing for unprecedented accuracy in tracking adult salmon. The technique has promise for restoring salmon populations and studying their migrations.