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Radiation of Extant Cetaceans Driven by Restructuring of the Oceans
- M. Steeman, M. Hebsgaard, E. Willerslev
- Environmental Science, GeographySystematic Biology
- 5 October 2009
It is found that the toothed whales are monophyletic, suggesting that echolocation evolved only once early in that lineage some 36–34 Ma, and support is found for increased diversification rates during periods of pronounced physical restructuring of the oceans.
Phylogeny of the true water bugs (Nepomorpha: Hemiptera–Heteroptera) based on 16S and 28S rDNA and morphology
The present analysis strongly supports a sister group relationship between the families Aphelocheiridae and Potamocoridae, a monophylum for which a new superfamily,Aphelocheiroidea, is proposed.
Ancient bacteria show evidence of DNA repair
- S. Johnson, M. Hebsgaard, E. Willerslev
- BiologyProceedings of the National Academy of Sciences
- 4 September 2007
The results show evidence of bacterial survival in samples up to half a million years in age, making this the oldest independently authenticated DNA to date obtained from viable cells and find strong evidence that this long-term survival is closely tied to cellular metabolic activity and DNA repair that over time proves to be superior to dormancy as a mechanism in sustaining bacteria viability.
Ancient Biomolecules from Deep Ice Cores Reveal a Forested Southern Greenland
It is shown that DNA and amino acids from buried organisms can be recovered from the basal sections of deep ice cores, enabling reconstructions of past flora and fauna in high-altitude southern Greenland.
Geologically ancient DNA: fact or artefact?
Communities of algae and cyanobacteria on glaciers in west Greenland
New data from an enigmatic phylum: evidence from molecular sequence data supports a sister‐group relationship between Loricifera and Nematomorpha
- M. Sørensen, M. Hebsgaard, Iben Heiner, H. Glenner, E. Willerslev, R. Kristensen
- 1 August 2008
The results imply that a revision of the conception of early ecdysozoan evolution is required and suggest that evolution through progenesis (sexual maturation of larvae) may have played an important role among the ancestral cycloneuralians.
On the Origin of Insects
The metamorphoses of this group have always seemed to me one of the greatest difficulties of the Darwinian theory, and I feel great difficulty in conceiving by what natural process an insect with a suctorial mouth could be developed from a powerfully mandibulate type like the Orthoptera, or even from the Neuroptera.
Down regulation of Hsp70 expression level prolongs the duration of heat-induced male sterility in Drosophila buzzatii
The results matched the hypotheses, leading to the conclusion that higher Hsp70 expression reduces the duration of heat-induced male sterility.