Caffeine crystals by Annie Cavanagh and David McCarthy. This false-coloured scanning electron micrograph shows caffeine crystals. Caffeine is a bitter, crystalline xanthine alkaloid that acts as a stimulant drug.
Emiliania huxleyi - single-celled marine phytoplankton that produce calcium carbonate scales (coccoliths). A scanning electron micrograph of a single coccolithophore cell. Taylor (University of North Carolina Wilmington Microscopy Facility)
Image: Annie Cavanagh, Wellcome Images - Of the 100 billion neurons in your brain, Purkinje neurons are some of the largest. Among other things, these cells are the masters of motor coordination in the cerebellar cortex.
Spicules from a sponge found in South African waters Courtesy of Miranda Waldron Image Details Instrument used: Nova NanoSEM Family Magnification: Horizontal Field Width: 149 um Voltage: 2 kV Spot: Working Distance: Detector: vCD