Latvia Emilija Gudriniece September 18, 2020 The stamp commemorates Emilija Gudriniece (1920-2004), a Latvian chemist who specialized in organic synthesis. The design includes a ball-and-stick model of nitrofurazone, an organic compound most commonly used as a topical antibiotic ointment.
Portugal International Year of Crystallography July 21, 2014 Set of five stamps and a minisheet. The stamp entitled Biology shows a 3D model of polypeptide chain and heme group, building blocks of hemoglobin.
Israel International Year of Crystallography December 3, 2013 The design shows scanning electronic microscope image of an aluminum-manganese alloy. The background shows electron diffraction pattern and interpreted molecular model of a quasicrystal, a structure that is ordered but not periodic.
Venezuela Venezuelan Institute for Scientific Research December 14, 2007 Set of ten, one stamp shows a model of the molecular structure of myosin, a fibrous protein that enables muscle contraction and is also involved in motion in other types of cells.