Coal is classified in four main categories based on the amounts of carbon it contains and the heat energy it can produce. The higher ranks of coal typically contain more heat-producing energy. Lignite â Over time, heat and burial pressure turn peat into lignite. Lignite is somewhat light in color, soft and crumbly.
Note: The latest contact information is available at the DARS website. DARS provides services to Texans who are disabled and to families with children who have developmental delays.
Darier's disease (DAR), also known as Darier disease, DarierâWhite disease, Dyskeratosis follicularis and Keratosis follicularis, is an autosomal dominant disorder discovered by French dermatologist Ferdinand-Jean Darier.Darier's is characterized by dark crusty patches on the skin, sometimes containing pus.he symptoms of the disease are thought to be caused by an abnormality in the desmosome-keratin filament complex leading to a breakdown in cell adhesion. Worldwide prevalence is estimated as between 1: 30,000 and 1: 100,000.