Glycine Crystals (C2H5NO2)
Polarized light micrograph of crystals of glycine, the simplest of the amino acids. Glycine is a neurotransmitter. It is important in metabolism because it contributes carbon atoms in the formation of the blood pigments. Glycine is also used in the synthesis of adenine and guanine, two of the nucleic acids.
This is a colored scanning electron micrograph (SEM) image of crystals of tungsten metal, called a tungsten forest, coating the inside of an electron gun of a SEM. The energy of the beam of electrons produced by the gun is so powerful that it evaporates the tungsten metal, which then cools and crystallizes on the inner surface of the gun’s chamber. This image has a magnification of 1,920 times its original size when viewed at a size of 10 centimeters.