something to look forward to... Year after year, Burpee's perennial seeds and plants will fill your home garden beds and borders. Select from our full palette of colors, textures, forms and fragrances to create the perennial garden of your dreams-a sensory pleasure for years to come.omething to look forward to... Year after year, Burpee's perennial seeds and plants will fill your home garden beds and borders. Select from our full palette of colors, textures, forms and fragrances to create the perennial garden of your dreams-a sensory pleasure for years to come.
A fullerene is a molecule of carbon in the form of a hollow sphere, ellipsoid, tube, and many other shapes. Spherical fullerenes are also called buckyballs, and they resemble the balls used in football (soccer). Cylindrical ones are called carbon nanotubes or buckytubes.he smallest fullerene is the dodecahedral C 20. There are no fullerenes with 22 vertices. The number of fullerenes C 2n grows with increasing n = 12, 13, 14, ..., roughly in proportion to n 9 (sequence A007894 in OEIS). For instance, there are 1812 non-isomorphic fullerenes C 60.
Aromatic hydrocarbons, or arenes, are those that have at least one benzene ring in them. A benzene ring is a ring of six carbon atoms with three double bonds. The formula for benzene, the simplest arene and base structure for all others, is C6H6. Any compound with a benzene ring is called an aromatic compound. There are many such compounds, which tend to be carcinogenic.