Renal agenesis. Renal agenesis is a medical condition in which one (unilateral) or both (bilateral) fetal kidneys fail to develop.
Polycrystalline cells are composed of multiple silicon crystals, which is a cheaper way to manufacture solar modules. Put simply, these cells are easier for a factory to produce, so they are less expensive. Polycrystalline cells are made by several methods, but most commonly with a cast of molten silicon.
Jupiterimages/Photos.com/Getty Images. Polyester is a durable, easy-care synthetic fabric made from petroleum byproducts. It can be manufactured in a variety of weights and textures. Polyester is used for a wide range of applications, including clothing, home furnishings and industrial fabrics.