Results 11 to 20 of about 601,537 (357)
Re‐evaluation of argon (E 938) and helium (E 939) as food additives [PDF]
EFSA JournalThe Panel on Food Additives and Flavourings (FAF) provides a scientific opinion re‐evaluating the safety of the two food additives argon (E 938) and helium (E 939). Argon (Ar) and helium (He) are two noble gases, highly stable single atoms.
EFSA FAF Panel (EFSA Panel on Food Additives and Flavourings) +21 more
doaj +2 more sources
Therapeutic gases used in balneotherapy and rehabilitation medicine - scientific relevance in the last ten years (2011 – 2020) - Synthetic literature review [PDF]
Balneo and PRM Research Journal, 2021 : Background. The medical relevance of therapeutic gases can range from use in burns and stroke victims to hypoxia therapy in children. However, medical gases such as oxygen, hydrogen, helium and xenon have recently come under increased exploration for
MUNTEANU Constantin +3 more
doaj +1 more source
Reduction of the Pressurization System Final Mass for a Modern Rocket Launcher [PDF]
Journal of Aerospace Technology and Management, 2022 The work focuses on optimizing the pressurization system’s operating performance for a fuel tank of a turbo-pumped liquid propellant rocket engine. This system is the most complex and expensive in a medium-size launch vehicle, after the engine.
Yurii Mitikov, Olexiy Shynkarenko
doaj +1 more source
The principles of helium exploration
Petroleum Geoscience, 2022 Commercial helium systems have been found to date as a serendipitous by-product of petroleum exploration. There are nevertheless significant differences in the source and migration properties of helium compared with petroleum.
D. Danabalan +6 more
semanticscholar +1 more source
Assessing the expansion of the Cambrian Agronomic Revolution into fan-delta environments
Scientific Reports, 2022 The intensity, extent, and ecosystem-level impact of bioturbation (i.e. Agronomic Revolution) at the dawn of the Phanerozoic is a hotly debated issue.
Andrei Ichaso +4 more
doaj +1 more source
Unimpeded Permeation of Water Through Helium-Leak–Tight Graphene-Based Membranes [PDF]
Science, 2011 Porous Membranes Thin semi-permeable membranes are commonly used as chemical barriers or for filtration purposes. While the size of the pores will influence which molecules are able to pass, other factors—including the surface chemistry of the pore walls,
R. Nair +4 more
semanticscholar +1 more source
Improving helium abundance determinations with Leo P as a case study [PDF]
Journal of Cosmology and Astroparticle Physics, 2020 Currently, the primordial helium abundance is best estimated through spectroscopic observations of H II regions in metal-poor galaxies. However these determinations are limited by several systematic uncertainties which ultimately limit our ability to ...
E. Aver +5 more
semanticscholar +1 more source
Nicotinamide adenine dinucleotide and the sirtuins caution: Pro‐cancer functions
Aging Medicine, 2021 This scoping review aims to perform a brief but comprehensive assessment of existing peer‐reviewed literature and determine whether raising nicotinamide adenine dinucleotide can prevent or promote tumorigenesis. The examination of extensive peer‐reviewed
Raymond D. Palmer, Mauro Vaccarezza
doaj +1 more source
The PHLEK Survey: A New Determination of the Primordial Helium Abundance [PDF]
Astrophysical Journal, 2020 We present Keck NIRSPEC and Keck NIRES spectroscopy of sixteen metal-poor galaxies that have pre-existing optical observations. The near-infrared (NIR) spectroscopy specifically targets the He i λ10830 Å emission line, due to its sensitivity to the ...
Tiffany Hsyu +3 more
semanticscholar +1 more source
Aging Medicine, 2021 Nicotinamide adenine dinucleotide (NAD) is a coenzyme found in every human cell and regulates a number of systems across multiple cellular compartments and tissue types via an endogenous and exogenous influence.
Raymond D. Palmer +2 more
doaj +1 more source