Results 81 to 90 of about 24,208 (239)

Detection of Inconsistencies in Isotope Ratios Certified in the Isotopic Primary Standards for Copper, Zinc and Nickel

Geostandards and Geoanalytical Research, Volume 48, Issue 4, Page 795-805, December 2024.
Key Points Isotopic reference materials are rarely cross‐examined. An optimised regression model and MC‐ICP‐MS offer a cost‐effective way to assess the reliability of values assigned to multi‐isotope reference materials. A significant lack of consistency has been observed in the long‐standing isotopic reference materials for nickel and zinc. Calibrated
Juris Meija, Juan He, Brad Methven, Zoltán Mester, Lu Yang   +4 more
wiley   +1 more source

The evolution and history of Vinca alkaloids: From the Big Bang to the treatment of pediatric acute leukemia

Pediatric Blood &Cancer, Volume 71, Issue 11, November 2024.
Abstract An attractive flower from the island of Madagascar has in part saved the lives of thousands of children with acute lymphoblastic leukemia (ALL). Random mutations and alterations to the genome led to the evolution of genes encoding enzymes, which would provide the periwinkle flower an arsenal of secondary metabolites to survive within the ...
Jeffrey W. Taub, Steven A. Buck, Ana C. Xavier, Holly Edwards, Larry H. Matherly, Yubin Ge   +5 more
wiley   +1 more source

Precise Measurement of Magnesium Isotopes in Fe‐Mg Minerals Using a Multi‐collector SHRIMP Ion Microprobe

Geostandards and Geoanalytical Research, Volume 48, Issue 2, Page 331-343, June 2024.
Key Points Corrected for the Earth's magnetic field, the SHRIMP's IMF depends on the mineral species, not the chemical composition. The IMF arises from the force constant difference between "hard" and "soft" bonds, which is characteristic of each mineral. This permitted the calculation of IMF‐correction factors for most common Mg‐bearing minerals.
Fernando Bea, Pilar Montero, Delia Ortega, José F. Molina, Aitor Cambeses, Leticia Barcos, Shui‐Jiong Wang, Shan Ke   +7 more
wiley   +1 more source

The bulk mineralogy, elemental composition, and water content of the Winchcombe CM chondrite fall

Meteoritics &Planetary Science, Volume 59, Issue 5, Page 1006-1028, May 2024.
Abstract On the microscale, the Winchcombe CM carbonaceous chondrite contains a number of lithological units with a variety of degrees of aqueous alteration. However, an understanding of the average hydration state is useful when comparing to other meteorites and remote observations of airless bodies.
H. C. Bates, A. J. King, K. S. Shirley, E. Bonsall, C. Schröder, F. Wombacher, T. Fockenberg, R. J. Curtis, N. E. Bowles   +8 more
wiley   +1 more source

Heavy Elements and Electromagnetic Transients from Neutron Star Mergers

Annalen der Physik, Volume 536, Issue 2, February 2024.
Astro‐(physics) has made major leaps forward through the combined information provided by both gravitational waves and electromagnetic emission from the first detected neutron star merger event. This review provides an up‐to‐date overview of today's understanding of neutron star mergers and their electromagnetic emission and it discusses possible ...
Stephan Rosswog, Oleg Korobkin
wiley   +1 more source

The heavy-element abundances of AGB stars and the angular momentum conservation model of wind accretion for barium stars [PDF]

, 2000
Adpoting new s-process nucleosynthesis scenario and branch s-process path, we calculate the heavy-element abundances and C/O ratio of solar metallicity 3M_sun TP-AGB stars.
Liang, Y. C., Zhang, B., Zhao, G.
core   +1 more source

Nucleosynthesis in Type II supernovae and the abundances in metal-poor stars [PDF]

, 1998
We explore the effects on nucleosynthesis in Type II supernovae of various parameters (mass cut, neutron excess, explosion energy, progenitor mass) in order to explain the observed trends of the iron-peak element abundance ratios ([Cr/Fe], [Mn/Fe], [Co ...
Adam Burrows, Barbuy B., Edvardsson B., Friedrich‐Karl Thielemann, Gratton R. G., Gratton R. G., Gratton R. G., Gratton R. G., Hashimoto M., Hideyuki Umeda, Ken'ichi Nomoto, Magain P., Molaro P., Molaro P., Nissen P. E., Nomoto K., Primas F., Schaller G., Shigeyama T., Takayoshi Nakamura, Tsujimoto T., Zhao G.   +21 more
core   +4 more sources

The Role of Rotation on the Yields of the Two γ-Ray Emitters 26Al and 60Fe Ejected by Massive Stars

The Astrophysical Journal
We show that the observed ^60 Fe/ ^26 Al flux ratio provided by the SPectrometer on INTEGRAL satellite (0.24 ± 0.04) can be reproduced only if rotation is taken into account in the computation of the stellar models.
Agnese Falla, Lorenzo Roberti, Marco Limongi, Alessandro Chieffi   +3 more
doaj   +1 more source

Current quests in nucleosynthesis: present and future neutron-induced reaction measurements

EPJ Web of Conferences, 2014
We present some open questions in nucleosynthesis focused on the measurement of relevant neutron capture cross-sections and on new experimental methods.
Praena J., Pignatari M., Mastinu P.F., Martín-Hernández G., Prete G., Quesada J.M., Sabaté-Gilarte M.   +6 more
doaj   +1 more source

Modeling of Cosmogenic Cr Isotopes Produced in Lunar Rocks Compared With Existing Calculations and Measurements

Journal of Geophysical Research: Planets, Volume 129, Issue 2, February 2024.
Abstract The nucleosynthetic Cr isotope anomalies provides useful information to trace the source and origin of extraterrestrial samples, but it is usually influenced by high‐energy cosmic rays, and evaluating such effect of cosmic rays in lunar samples is especially important.
Bailiang Liu, Jingnan Guo, Mikhail I. Dobynde, Jia Liu, Yingnan Zhang, Liping Qin   +5 more
wiley   +1 more source