منابع مشابه
Heterotrophic microbial communities use ancient carbon following glacial retreat.
When glaciers retreat they expose barren substrates that become colonized by organisms, beginning the process of primary succession. Recent studies reveal that heterotrophic microbial communities occur in newly exposed glacial substrates before autotrophic succession begins. This raises questions about how heterotrophic microbial communities function in the absence of carbon inputs from autotro...
متن کاملAncient Gold Mining Activities in India - An Overview
Gold was obtained through washing or panning of the river sands during initial periods of civilisation. With the advent of knowledge of metallurgical processing of ores it was recovered through mining of in-situ quartz reefs, and then from auriferous sulphide ores. The metal mining activities are evidenced in the form of large number of ‘ancient metal mines’ or ‘old workings’ and ‘placer mining...
متن کاملGrowth rate of the ancient human population in Australia
In the earlier publications (Nielsen aka Nurzynski, 2013a, 2013b) we have discussed the growth of human population in Australia as determined by the study of the time-dependent distribution of rock shelter sites between 10,000 and 1,000 years BP (before present). We have shown that if the number of rock shelter sites is assumed to represent also the size of human population, the growth of the p...
متن کاملStaying out in the cold: glacial refugia and mitochondrial DNA phylogeography in ancient European brown bears.
Models for the development of species distribution in Europe typically invoke restriction in three temperate Mediterranean refugia during glaciations, from where recolonization of central and northern Europe occurred. The brown bear, Ursus arctos, is one of the taxa from which this model is derived. Sequence data generated from brown bear fossils show a complex phylogeographical history for wes...
متن کاملLipid biomarkers in Holocene and glacial sediments from ancient Lake Ohrid
Introduction Conclusions References
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ژورنال
عنوان ژورنال: Nature
سال: 1892
ISSN: 0028-0836,1476-4687
DOI: 10.1038/047055c0