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.
Polymer nomenclature is generally based upon the type of monomer residues comprising the polymer. Polymers that contain only a single type of repeat unit are known as homopolymers, while polymers containing a mixture of repeat units are known as copolymers.Poly(styrene), for example, is composed only of styrene monomer residues, and is therefore classified as a homopolymer. branched polymer molecule is composed of a main chain with one or more substituent side chains or branches. Types of branched polymers include star polymers, comb polymers, brush polymers, dendronized polymers, ladders, and dendrimers.