Results 61 to 70 of about 21,160 (248)
Toward a minimal amino acid alphabet for protein design
The FEBS Journal, EarlyView.Proteins are built from 20 canonical amino acids; however, it is interesting to investigate whether they can also be formed from reduced amino acid alphabets. Using protein design, we designed proteins based on all alphabets comprising 2 to 10 ‘early’ amino acids (those likely to have been present before the origin of life).
Karel Půbal +5 more
wiley +1 more source
Classification of stony meteorites and chondrules – the case of meteorite Jesenice
Geologija, 2012 In the first part of the paper there is a description about genesis of meteorites, in particularly about stony meteorites– chondrites, since meteorite Jesenice is an ordinary L chondrite. Chondrules represent main part of the mass ofchondritic meteorites.
Bojan Ambrožič +3 more
doaj
Formation of nickel–iron meteorites by chemical fluid transport
ScienceOpen Research, 2016 The deposition of solid material from the gas phase via chemical vapor transport (CVT) is a well-known process of industrial and geochemical relevance. There is strong evidence that this type of thermodynamically driven chemical transport reaction plays ...
Werner Schrön
doaj +1 more source
Terrestrial ages of Antarctic meteorites: Implications for concentration mechanisms [PDF]
, 1986 Antarctic meteorites differ from meteorites fallen in other places in their mean terrestrial ages. Boeckl estimated the terrestrial half-life for the disintegration of stone meteorites by weathering under the climatic conditions of the Western United ...
Schultz, L.
core
Quantification of Sulfur Speciation in Apatites: Comparison of the XAS, XPS and EPMA Techniques
Geostandards and Geoanalytical Research, EarlyView.Key Points Sulfur speciation in apatites has been determined by S K‐edge X‐ray absorption near‐edge structure (XANES) spectroscopy, S 2p X‐ray photoelectron spectroscopy (XPS) and electron probe microanalysis (EPMA). XANES provides the most sensitive and accurate quantification of sulfur speciation.
Yuzhou Feng +8 more
wiley +1 more source
Dawn maps the surface composition of Vesta [PDF]
, 2011 By 7-October-2011, the Dawn mission will have completed Survey orbit and commenced high altitude mapping of 4Vesta. We present a preliminary analysis of data acquired by Dawn’s Framing Camera (FC) and the Visual and InfraRed Spectrometer (VIR) to ...
Lawrence, D. +48 more
core
Marine migration influences mercury accumulation in anadromous Arctic char (Salvelinus alpinus)
Journal of Fish Biology, EarlyView.Abstract Mercury (Hg) is a globally distributed toxic metal present in northern natural environments that biomagnifies in food webs and bioaccumulates in apex predator fish, such as Arctic char (Salvelinus alpinus)—an iteroparous species with a circumpolar distribution. Arctic char exhibit a variety of life history types, with the migrating, anadromous
Isabel R. Hilgendag +6 more
wiley +1 more source
Quantitative FT-IR Analysis for Chondritic Meteorites: Search for C_60 in Meteorites [PDF]
Journal of Astronomy and Space Sciences, 1998 Infrared absorption spectra of 9 bulk samples and 3 acid residues of meteorites were obtained in the mid-infrared region (4000 ~ 400 cm^(-1)). From the known composition of meteorites studied, the possible absorption modes were investigated.
Chunglee Kim, Jongmann Yang
doaj
A Portable Magnetometer for Magnetic Measurements of Meter‐Sized Meteorites
Geochemistry, Geophysics, Geosystems, 2020 Meteorites contain records of past magnetic fields in the form of natural remanent magnetization (NRM). A key property of meteorite magnetization that provides information about its origin is its dependence on spatial scale.
Elise Clavé +6 more
doaj +1 more source