Biologie

Beetle tracheas

Tracheal tubes are visible in this synchrotron x-ray phase contrast image (right) of a tenebrionid beetle (left). See: Alexander et al., “Increase in tracheal investment with beetle size supports hypothesis of oxygen limitation on insect gigantism,” Proc. Natl. Acad. Sci. USA 104(32), 13198 (August 7, 2007). DOI: 10.1073pnas.0611544104. (Courtesy: The Field Museum of Natural History, Chicago, IL; and Argonne National Laboratory)This image was created with the use of the Advanced Photon Source, located at Argonne National Laboratory, in Illinois. The APS is the source of the brightest X-rays in the Western Hemisphere.Courtesy Argonne National Laboratory.
Bild: Argonne National Laboratory

Klaus Stuttmann Karikaturen

Bild: Verkleinertes Original mit freundlicher Genehmigung Klaus Stuttmann
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Shy Albatross

The Shy Albatross is almost a metre tall and has a wingspan of over two metres. It is a magnificent flyer, gliding for months at a time above the southern oceans, where it feeds on squid and fish. The Shy Albatross is a typical mollymawk with dark plumage on its back, upperwing and tail and a white belly, neck and underwing. Its crown and most of its head is also white, but it has a dark eyebrow and pale grey on the face. Its bill is pale grey with a yellow ridge and tip. Officially listed as vulnerable
Bild: marj k

Animiertes Strukturmodell einer DNA-Helix in B-Konformation.

Die Stickstoff (blau) enthaltenden Nukleinbasen liegen waagrecht zwischen zwei Rückgratsträngen, welche sehr reich an Sauerstoff (rot) sind. Kohlenstoffatome sind grün dargestellt. Das Modell dreht sich rechts herum; kräftige Farben sind weiter vorne, blasse Farben weiter hinten.
Bild: Zephyris

Chromosome Y ethno-genogeographic lineage

Bild: PLoS Biology

The HuRef donor Y chromosome haplotype suggests descent from several European/US groups given the Y chromosome ethno-geographic markers. The haplogroup membership is R1b6 with includes individuals from the United Kingdom, Germany, Russia, and the United States, which is consistent with the self-reported family tree provided by the HuRef donor. The thick red line denotes the markers needed to trace the haplotype from the mapping of the chromosome Y markers to the HuRef genome. Data and figure from the Y Chromosome Consortium; http://ycc.biosci.arizona.edu/nomenclature_system/frontpage.html.