Results 61 to 70 of about 6,449 (205)

Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight

Experimental Physiology, EarlyView.
Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley   +1 more source

The Impact of Population III.1 Flash Reionization for Cosmic Microwave Background Polarization and Thomson Scattering Optical Depth

The Astrophysical Journal Letters
The Population III.1 theory for supermassive black hole (SMBH) formation predicts a very early ( z  ∼ 20–25) transient phase, the “Pop III.1 Flash,” of cosmic reionization powered by supermassive stars that are SMBH progenitors. The Universe then quickly
Jonathan C. Tan, Eiichiro Komatsu
doaj   +1 more source

QUIJOTE scientific results

Astronomy & Astrophysics
We introduce a novel approach to estimate the spectral index, βs, of polarised synchrotron emission, combining the moment expansion of Cosmic Microwave Background foregrounds and the constrained Internal Linear Combination method.
Adak D., Rubiño-Martín J. A., Génova-Santos R. T., Remazeilles M., Almeida A., Aryan K., Ashdown M., Barreiro R. B., Bose U., Cepeda-Arroita R., Casas J. M., Fernández-Torreiro M., Martínez-Gonzalez E., Poidevin F., Rebolo R., Vielva P.   +15 more
doaj   +1 more source

Contribution of Unresolved Sources to Diffuse Gamma-Ray Emission from the Galactic Plane

The Astrophysical Journal
The diffuse gamma-ray emission from the Milky Way serves as a crucial probe for understanding the propagation and interactions of cosmic rays within our Galaxy.
Jiayin He, Houdun Zeng, Yi Zhang, Qiang Yuan, Rui Zhang, Jun Li   +5 more
doaj   +1 more source

Possible extragalactic positron annihilation signal

Astronomy & Astrophysics
Context. With 20 years of INTEGRAL/SPI observations, the most detailed map of the positron annihilation line at 511 keV was created. While the central bulge and extended disk are readily recognised in this map, several hotspots at high latitude regions ...
Siegert Thomas, Yoneda Hiroki
doaj   +1 more source

Cellular mechanisms of radiation‐induced myocyte dysfunction: effects on calcium handling, ion channel regulation and mitochondrial energetics

The Journal of Physiology, EarlyView.
Abstract figure legend Dose‐dependent effects of radiation on cardiac electrophysiology and arrhythmia susceptibility. At low radiation doses (left), increased reactive oxygen species (ROS) initiate an ROS–Ca2+ positive feedback loop involving calcium/calmodulin‐dependent protein kinase II (CaMKII) activation, enhanced L‐type Ca2+ current (ICaL ...
Hannah M. Zukowski, Colleen E. Clancy
wiley   +1 more source

CMB-S4: Iterative Internal Delensing and r Constraints

The Astrophysical Journal
The tightest constraints on the tensor-to-scalar ratio r can only be obtained after removing a substantial fraction of the lensing B -mode sample variance.
Sebastian Belkner, Julien Carron, Louis Legrand, Caterina Umiltà, Clem Pryke, Colin Bischoff, CMB-S4 Collaboration   +6 more
doaj   +1 more source

No Degree, No Lab, No Borders: An Independent Researcher's Journey From Yemen to Global Science

Perspectives of Earth and Space Scientists, Volume 7, Issue 1, December 2026.
Abstract I grew up in Yemen with a dream to study space, but my country had no astronomy programs, no universities for astrophysics, and soon, no stable peace. This Perspective is a personal and systemic account of how I pursued planetary science from a conflict zone—with no smartphone, no home internet, no supervisor, and no institutional backing.
Fahd Ali Ahmed Abdulwahab Alfatesh
wiley   +1 more source

Neutrinos and Big Bang Nucleosynthesis

Advances in High Energy Physics, 2012
According to the standard models of particle physics and cosmology, there should be a background of cosmic neutrinos in the present Universe, similar to the cosmic microwave photon background.
Gary Steigman
doaj   +1 more source

Review on studies in natural background radiation

Radiation Protection and Environment, 2018
The environment around us is radioactive due to background radiation emitted from the sky, earth's crust, food, water, and building materials. The human body gets exposed to radiation doses of about 82%, which are out of control; they arise from ...
Abdu Hamoud Al-Khawlany, A R Khan, J M Pathan   +2 more
doaj   +1 more source