Use insulin in a sentence. a protein hormone secreted by the islets of Langerhans, in the pancreas, which helps the body use sugar and other carbohydrates. a preparation extracted from the pancreas of sheep, oxen, etc. and used hypodermically in the treatment of diabetes mellitus.
Decorative chrome plating on a motorcycle. Chrome plating (less commonly chromium plating), often referred to simply as chrome, is a technique of electroplating a thin layer of chromium onto a metal or plastic object.The chromed layer can be decorative, provide corrosion resistance, ease cleaning procedures, or increase surface hardness. typical hexavalent chromium plating process is: (1) activation bath, (2) chromium bath, (3) rinse, and (4) rinse. The activation bath is typically a tank of chromic acid with a reverse current run through it.
Chrome prevents the stem from galling when cast iron guides are used, and it helps prevent positive valve seal wear on intake valves. If the chrome is ground off and the valve stem is not replated, it must be used with either a bronze liner or guide.nadequate lubrication may be caused by oil starvation in the upper valve train due to low oil pressure, obstructed oil passages, push rods, etc. Lack of oil can cause stem scuffing, rapid stem and guide wear, possible valve sticking and ultimately valve failure due to poor seating and overheating.