Spherulites of lead chromate (Crocoite) on the surface of a decorative glaze (60x)
From The Earth Story Facebook:
While it certainly looks as though someone has taken a great deal of paint to these hills, these colours in fact formed naturally.
This unique geological formation is known as the Zhangye Danxia landform, found in southern China. It was formed by sediments laid down in a low-elevation fault basin during the Cretaceous period, which then experienced uplift due to their position on top of various fault zones. The various colours are a result of the erosion of the thick-bedded red sandstone and conglomerate: from running water erosion, biological effect, chemical precipitation and organic staining.
Dried film of amorphous silica and aqueous colloidal solution (10x)
Recrystallized lysine (100x)
I don’t know what to call this pattern, but I like it!
Image 2: 2,2-(Bipyridine)(Naphthalene)-fusion melt (25x)
Herb Comess. Honorable Mention, 1994 Nikon Small World Photomicrography Competition (link)
Image 1: B-factor plot for 1AV1 truncated human apolipoprotein A-I
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
“First direct observation of the orbital structure of an excited 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
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.”
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
Visualizing bond-length differences in a single molecule (hexabenzocoronene) using atomic force microscopy
Gross et al. 2012. “Bond-Order Discrimination by Atomic Force Microscopy.” Science. Vol. 337 no. 6100 pp. 1326-1329. DOI: 10.1126/science.1225621