Caption: “Intercalation induces structural distortions. Left: unchanged DNA strand. Right: DNA strand intercalated at three locations (black areas).”

“In chemistryintercalation is the reversible inclusion of a molecule (or group) between two other molecules (or groups). Examples include DNA intercalation and graphite intercalation compounds.”

From the Wikipedia article on “Intercalation

(img source)

Image 1: B-factor plot for 1AV1 truncated human apolipoprotein A-I

Source: http://www.xray.utmb.edu/#BPATCH

Caption: “B-factor plot of 1AV1, refined at 4 Å using the PMB B-factor patch for isotropic B-factor restraints. Note that even the side-chain b-factors are well-behaved, and that the molecular motions are modeled more accurately by these individual B-factors than they could be by a series of group B-factors.”

What is a B-factor plot? I don’t know, but these folks say: “Blue means helix, red means strand and green means turns and random coil.”

Image 2: Another view of 1AV1 structure

Source and more info: http://www.rcsb.org/pdb/explore.do?structureId=1av1

What is apolipoprotein A1? According to Wikipedia, it’s “the major protein component of high density lipoprotein (HDL) in plasma” i.e. the good cholesterol. It helps clear fats! Good job, apo A-I!

“First direct observation of the orbital structure of an excited hydrogen atom”!

Summary: http://physicsworld.com/cws/article/news/2013/may/23/quantum-microscope-peers-into-the-hydrogen-atom

Original article: Stodolna et al. 2013. “Hydrogen Atoms under Magnification: Direct Observation of the Nodal Structure of Stark States.” Phys. Rev. Lett. 110, 213001 DOI: 10.1103/PhysRevLett.110.213001

http://prl.aps.org/abstract/PRL/v110/i21/e213001

Covalent bonds made visible!

“The chemical rearrangement of oligo-(phenylene-1,2-ethynylenes) as seen in the microscope image (top) and the stick diagram of the molecular structure. Photo: de Oteyza et al.”

Summary: http://blogs.smithsonianmag.com/smartnews/2013/05/for-the-first-time-see-what-the-most-basic-chemistry-actually-looks-like/

Original article:
de Oteyza et al. 2013. “Direct Imaging of Covalent Bond Structure in Single-Molecule Chemical Reactions.” Science. Vol. 340 no. 6139 pp. 1434-1437 DOI: 10.1126/science.1238187

http://www.sciencemag.org/content/340/6139/1434.full

Visualizing bond-length differences in a single molecule (hexabenzocoronene) using atomic force microscopy
Image from:
http://www.bbc.co.uk/news/science-environment-19584301

Source article:
Gross et al. 2012. “Bond-Order Discrimination by Atomic Force Microscopy.” Science. Vol. 337 no. 6100 pp. 1326-1329. DOI: 10.1126/science.1225621
http://www.sciencemag.org/content/337/6100/1326.full