The analysis of stable carbon (δ13C) isotope ratios from human skeletal remains is the most commonly applied technique for the investigation of palaeodiet (Ambrose,1986; Bird et al.,2021; Katzenberg,2018). Variation in δ13C among terrestrial plants is primarily influenced by the photosynthetic ...
1b and 2c). The 25.5–33 meV optical phonon band of the ZrNiSn parent sample, which contains the prominent tail, can be decomposed into two peaks as shown in Fig. 4a. To understand the origin of the tail, first-principles calculations of phonon dispersion are performed. As shown in...
samples have values (0.33, 0.33, and 0.32 mSv/y) slightly higher than the exemption level, they are still below: the limit dose of 1 mSv/y53and the recommended safety value of 0.41 mSv/y4(Fig.10a). Also, the YEGDinmean values for the examined rock types cover a span from 0.13 mSv...
2q), in contrast to the relatively homogeneous 87Sr/86Sr values of calcite with homogeneous δ13C values (Fig. 2r). Calcite in limestone fractures with abundant solid bitumen has highly positive δ13C values. Stable sulfur isotope composition of pyrite The δ34Spyrite values in fractured ...
(2020). It has been shown previously that the Tianyuan individual shared more alleles with an ∼35,000-year-old individual from Belgium (GoyetQ116-1; Fu et al., 2016) than with other contemporary western Eurasians and shared more alleles with modern Amazonian populations (i.e., Surui) ...
On the other hand, CAS δSSO434 that lies below the “expected values” is often attributed to contamination during extraction. For example, it has been shown that microcrystalline grains of pyrite will dissolve upon acid addition (Marenco et al., 2008); pyrite and other possible contaminants ...
below 0.01 kcal/mol. This procedure reduced the number of energy descriptors that entered the PLS analysis. The optimal dimensionality of the PLS models was determined by monitoring the cross-validation indexes as a function of the number of principal components (PCs) extracted. The cross-...
Although it has been shown that the promiscuity of MxcE allows the activation and loading of other benzoic acid derivatives to the assembly line to form precursor-derived non-natural myxochelin derivatives [12–14], the incorporation of heteroaromatic carboxylic acid precursors has so far not been...
This includes the integration of this part of the northern Tethyan margin into a broader palaeoceanographic, palaeoenvironmental and palaeoclimatic context, as explained below. 5 Ecological and palaeoenvironmental considerations in favour of a late Barremian age for the rise of the Urgonian platform...
This means that either atmospheric CO2 levels have no dis- cernible influence on climate (which is true), or that the proxy ice core reconstructions of the chemical composition of the ancient atmosphere are false (which is also true, as shown below). It was never experimentally demonstrated ...