Silicosis is a fibronodular lung disease caused by inhalation of dust containing crystalline silica (alpha-quartz or silicon dioxide), which is distributed widely, or its polymorphs (tridymite or cristobalite), which are distributed less widely.ilicosis is a fibronodular lung disease caused by inhalation of dust containing crystalline silica (alpha-quartz or silicon dioxide), which is distributed widely, or its polymorphs (tridymite or cristobalite), which are distributed less widely.
A phosphodiester bond occurs when exactly two of the hydroxyl groups in phosphoric acid react with hydroxyl groups on other molecules to form two ester bonds.Phosphodiester bonds are central to all life on Earth, as they make up the backbone of the strands of nucleic acid. phosphodiester bond occurs when exactly two of the hydroxyl groups in phosphoric acid react with hydroxyl groups on other molecules to form two ester bonds. Phosphodiester bonds are central to all life on Earth, as they make up the backbone of the strands of nucleic acid.
CK, formerly known as creatinine phosphokinase, is an important protein enzyme catalyzing the reversible phosphorylation reaction. ADP + creatine phosphate â ATP + creatine. CK is a dimeric molecule composed of M and/or B subunits. Two protein subunits form into 3 different isozymes: CK-MM, CK-MB, and CK-BB. CK-MM and CK-BB are abundantly found in skeletal muscle and the brain, respectively.