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.
This feldspar is distinguished from the plagioclase form by its content of potassium. The feldspars are the most abundant minerals on the earth. Polycrystalline orthoclase is usually light cream to salmon pink in color, although color is not a reliable indicator of mineral type.