59 research outputs found
Microstratigraphic preservation of ancient faunal and hominin DNA in Pleistocene cave sediments
Ancient DNA recovered from Pleistocene sediments represents a rich resource for the study of past hominin and environmental diversity. However, little is known about how DNA is preserved in sediments and the extent to which it may be translocated between archaeological strata. Here, we investigate DNA preservation in 47 blocks of resin-impregnated archaeological sediment collected over the last four decades for micromorphological analyses at 13 prehistoric sites in Europe, Asia, Africa, and North America and show that such blocks can preserve DNA of hominins and other mammals. Extensive microsampling of sediment blocks from Denisova Cave in the Altai Mountains reveals that the taxonomic composition of mammalian DNA differs drastically at the millimeter-scale and that DNA is concentrated in small particles, especially in fragments of bone and feces (coprolites), suggesting that these are substantial sources of DNA in sediments. Three microsamples taken in close proximity in one of the blocks yielded Neanderthal DNA from at least two male individuals closely related to Denisova 5, a Neanderthal toe bone previously recovered from the same layer. Our work indicates that DNA can remain stably localized in sediments over time and provides a means of linking genetic information to the archaeological and ecological records on a microstratigraphic scale
Neanderthals in changing environments from MIS 5 to early MIS 4 in northern Central Europe:Integrating archaeological, (chrono)stratigraphic and paleoenvironmental evidence at the site of Lichtenberg
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Homo sapiens reached the higher latitudes of Europe by 45,000 years ago
The Middle to Upper Palaeolithic transition in Europe is associated with the regional disappearance of Neanderthals and the spread of Homo sapiens. Late Neanderthals persisted in western Europe several millennia after the occurrence of H. sapiens in eastern Europe1. Local hybridization between the two groups occurred2, but not on all occasions3. Archaeological evidence also indicates the presence of several technocomplexes during this transition, complicating our understanding and the association of behavioural adaptations with specific hominin groups4. One such technocomplex for which the makers are unknown is the Lincombian–Ranisian–Jerzmanowician (LRJ), which has been described in northwestern and central Europe5,6,7,8. Here we present the morphological and proteomic taxonomic identification, mitochondrial DNA analysis and direct radiocarbon dating of human remains directly associated with an LRJ assemblage at the site Ilsenhöhle in Ranis (Germany). These human remains are among the earliest directly dated Upper Palaeolithic H. sapiens remains in Eurasia. We show that early H. sapiens associated with the LRJ were present in central and northwestern Europe long before the extinction of late Neanderthals in southwestern Europe. Our results strengthen the notion of a patchwork of distinct human populations and technocomplexes present in Europe during this transitional period
Application of the Complex Variable Semi-analytical Method for Improved Displacement Sensitivity Evaluation in Geometrically Nonlinear Truss Problems
Avaliação ultrassonográfica do aparelho reprodutor em serpentes vivíparas da família Boidae
Landscape analysis: Investigating the potentials of space and place
Analysing landscapes within a planning context requires both skill and insights. Drawing upon concrete examples, together with an examination of some theoretical concepts, this book guides the reader through a wide range of different approaches and techniques of landscape analysis that may be applied at different scales, from elementary site analysis to historical and regional studies. This is an essential book for students and graduate practitioners working in landscape architecture, planning and architecture
Digital pathology analysis reveals enhanced autophagy expression in pre-eclamptic placenta
Trophoblast apoptotic burden in fetal growth restriction (FGR) placenta: an image analysis study
Placental autophagy regulates trophoblast survival in placental dysfunction during pregnancy complications
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