1. Petroleum refinery process in which large heavy oil molecules are broken down into smaller ones. If conducted only with the application of heat, it is called thermal cracking. If a catalyst is also used, it is called catalytic cracking. If hydrogen is used in addition to heat and catalysts, it is called hydrocracking. 2. Deciphering of a code or encrypted data.
Vitamin D3 is the form of vitamin D called cholecalciferol. Cholecalciferol is the most widely known of the vitamin D series and is a fat soluble vitamin that is stored to some degree in the body. It is used as a dietary supplement and for the treatment and prevention of vitamin D deficiency.
Vitamin D is also sometimes used to treat other diseases in which calcium is not used properly by the body. Ergocalciferol is the form of vitamin D used in vitamin supplements. Some conditions may increase your need for vitamin D. These include: 1  Alcoholism.2  Intestine diseases.3  Kidney disease.4  Liver disease. 5  Overactivity of the parathyroid glands with kidney failure. 6  Pancreas disease. 7  Surgical removal of stomach.rgocalciferol is the form of vitamin D used in vitamin supplements. Some conditions may increase your need for vitamin D. These include: 1  Alcoholism. 2  Intestine diseases. 3  Kidney disease. 4  Liver disease. 5  Overactivity of the parathyroid glands with kidney failure.