Larger than A1 in size - The Eukaryotic and Prokaryotic Cells Wall Chart is ideal for your science classroom. Suitable from GCSE to A-Level, it is colourful, concise and outlines the key concepts in this topic. Get it for your classroom from only £5
Blood clot. Coloured scanning electron micrograph (SEM) of a blood clot from the inner wall of the left ventricle of a human heart. Red blood cells (erythrocytes) are trapped within a fibrin protein mesh (cream). The fibrin mesh is formed in response to chemicals secreted by platelets (pink), fragments of white blood cells. Clots are formed in response to cardiovascular disease or injuries to blood vessels. Connective tissue (orange) is also seen.
Diatom frustules. The remains of diatom skeletons (frustules). Diatoms are a group of photosynthetic, single-celled algae of about 10,000 species. They form an important part of plankton at the base of the marine and freshwater food chains. Their characteristic feature is the intricately patterned glass-like silica cell-wall, or frustule, which often has rows of tiny holes, known as striae. SEM ( Coloured scanning electron micrograph ) .