Results 71 to 80 of about 22,632 (204)

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

Big-Bang Nucleosynthesis [PDF]

, 2014
A critical review is given of the current status of cosmological nucleosynthesis. In the framework of the Standard Model with 3 types of relativistic neutrinos, the baryon-to-photon ratio, $\eta$, corresponding to the inferred primordial abundances of ...
Brian D. Fields, P. Molaro, Subir Sarkar
semanticscholar   +1 more source

Precision Big Bang Nucleosynthesis with the New Code PRIMAT [PDF]

Proceedings of the 15th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG15), 2019
Precision on primordial abundances, deduced from observations, have now reached the percent level for 4He and deuterium. Precision on big bang nucleosynthesis (BBN) predictions should, hence, reach the same level. The uncertainty on the 4He mass fraction
C. Pitrou, A. Coc, J. Uzan, E. Vangioni
semanticscholar   +1 more source

The evolving Planck mass in classically scale-invariant theories

Journal of High Energy Physics, 2017
We consider classically scale-invariant theories with non-minimally coupled scalar fields, where the Planck mass and the hierarchy of physical scales are dynamically generated.
K. Kannike, M. Raidal, C. Spethmann, H. Veermäe   +3 more
doaj   +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 Landscape, the Swampland and the Era of Precision Cosmology

Fortschritte der Physik, Volume 67, Issue 1-2, January-February 2019., 2019
Abstract We review the advanced version of the KKLT construction and pure de Sitter supergravity, involving a nilpotent multiplet, with regard to various conjectures that de Sitter state cannot exist in string theory. We explain why we consider these conjectures problematic and not well motivated, and why the recently proposed alternative string theory
Yashar Akrami, Renata Kallosh, Andrei Linde, Valeri Vardanyan   +3 more
wiley   +1 more source

Indirect Measurement of the 3He(n,p)3H Reaction Cross Section at Big Bang Energies

The Astrophysical Journal
Neutron-induced nuclear reactions play an important role in the Big Bang Nucleosynthesis. Their excitation functions are, from an experimental point of view, usually difficult to measure.
R. G. Pizzone, M. L. Sergi, A. A. Oliva, T. Zanatta-Martinez, L. Lamia, R. Spartá, G. L. Guardo, M. La Cognata, G. D’Agata, S. Palmerini, A. Tumino, M. Costa, D. Cittadino, A. Di Pietro, P. Figuera, I. Indelicato, A. Massara, S. Cherubini, G. G. Rapisarda, S. Romano, C. Spampinato, M. Couder, W. Tan, M. Wiescher, D. Lattuada, M. Gulino, V. Burjan, J. Mrazek, M. La Commara, M. Mazzocco, P. M. Prajapati, S. Aguilar, T. Anderson, D. Bardayan, D. Blankstein, L. Callahan, A. Clark, B. Frentz, A. Gula, M. Hall, S. L. Henderson, R. Kelmar, Q. Liu, J. Long, A. Majundar, S. McGiunness, A. Nelson, P. O’Malley, C. Seimour, M. Skulski, J. Wilkinson, S. M. Cha, K. Y. Chae, M. S. Kwag, S. Typel   +54 more
doaj   +1 more source

Big Bang Nucleosynthesis with an Inhomogeneous Primordial Magnetic Field Strength [PDF]

Astrophysical Journal, 2018
We investigate the effect on the Big Bang nucleosynthesis (BBN) from the presence of a stochastic primordial magnetic field (PMF) whose strength is spatially inhomogeneous.
Yudong Luo, T. Kajino, M. Kusakabe, G. Mathews   +3 more
semanticscholar   +1 more source

Nuclear astrophysicists at war

Natural Sciences, Volume 4, Issue 1, January 2024.
The Manhattan program not only opened the path to the nuclear age for humans, but also triggered a lot of new questions and research directions in nuclear physics and astrophysics that still inform the ideas in these fields today. Abstract The question of energy production in stars stimulated an entire generation of young physicists in the 1930s who ...
Michael Wiescher, Karlheinz Langanke
wiley   +1 more source

Toward a self-consistent and unitary reaction network for big-bang nucleosynthesis

EPJ Web of Conferences, 2014
Unitarity, the mathematical expression of the conservation of probability in multichannel reactions, is an essential ingredient in the development of accurate nuclear reaction networks appropriate for nucleosynthesis in a variety of environments.
Paris Mark W., Brown Lowell S., Hale Gerald M., Hayes-Sterbenz Anna C., Jungman Gerard, Kawano Toshihiko, Fuller George M., Grohs Evan B., Kunieda Satoshi   +8 more
doaj   +1 more source