Category Archives: biology

3D object reconstruction from random orientations

The featured item this time is “Structure from Fleeting Illumination of Faint Spinning Objects in Flight with Application to Single Molecules” by Russell Fung and co-authors at U Wisconsin Milwaukee. The promise of solving atomic-resolution 3D structure of biological proteins … Continue reading

Posted in biology, coherent, ultrafast, xfel, xray | Tagged , , , , , , , , | Leave a comment

More coherent x-ray lens-less image reconstructions

New paper in Science by Pierre Thibault et al. “High-Resolution Scanning X-ray Diffraction Microscopy” Science 321, 379 (2008). Authors use an approach identical to ptychography  to demonstrate the power of the technique by reconstructing the Fresnel Zone Plate – similar … Continue reading

Posted in biology, coherent, xray | Tagged , , , , , | Leave a comment

Nanoparticle Self-assembly with DNA

Image on the left is the cover of Jan. 31 issue of Nature. Anyone who took high school chemistry has played with “sticks and balls” models of molecules or crystalline atoms. There are magnetic toy sets which allow kids to … Continue reading

Posted in biology, colloids, soft matter, xray | Tagged , , , | Leave a comment

DNA capture and recapture with nanopores

The featured article is “Recapturing and trapping single molecules with a solid-state nanopore” by Gershow, M. & Golovchenko, J. A. Nature Nanotech. 2, 775–779 (2007). The idea behind nanopore-based DNA sequencing is relatively simple – pass a DNA molecule through … Continue reading

Posted in biology, soft matter | Tagged , , | 1 Comment