Process control systems in a chemical plant or oil refinery maintain fluid levels, pressures, temperature, chemical composition, etc. by controlling heaters, pumps and valves. [citation needed] The centrifugal governor of a steam engine, as designed by James Watt in 1788, reduces the throttle valve in response to increases in the engine speed, or opens the valve if the speed falls below the pre-set rate.
Collagen is made from dietary proteins. As a structural protein, collagen builds connective tissues found throughout your body. While it's essential for tendons and ligaments, collagen does much more than that: It supports soft tissues such as organs, gives resilience to bones and keeps your skin firm. It can fill such diverse jobs thanks to a chain-like structure that can form long filaments and crisscross into sheets of connective tissue.
The Causes And Effects Of Collagen Loss By NewBeauty Staff | July 12, 2010 Collagen is a tough, almost rubbery protein that's created by cells called fibroblasts. Packed together as bundles, fibrous bands of collagen serve as the main support system of the dermis, the deepest layer of skin. Collagen gives skin its strength, and it makes skin firm and flexible with the help of elastin. Collagen is essential for young-looking skin because it gives structure to its cells. When collagen levels becomes depleted, the skin has little internal support, causing it to sag and contributing to wrinkles. Furthermore, when there is ample collagen in the skin, it's strong and more resistant to the effects of weight gain, so a lack of it can lead to a greater risk of stretch marks. Around age 35, collagen production naturally begins to taper off, and the quality of the collagen diminishes.