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Albright syndrome is a rare condition, usually appears in the early years of life and characterized by bending or thickening of long bones. In girls, of endocrine glands disorders especially precocious puberty are the most common symptoms. Also, Brown pigments in the skin are another sing of this syndrome. Certain mucosal and skin pigments are considerable features of the disease. Etiology and ...
Reaction networks displaying bistability provide a chemical mechanism for long-term memory storage in cells, as exemplified by many epigenetic switches. These biological systems are not only bistable but switchable, in the sense that they can be flipped from one state to the other by application of specific molecular stimuli. We have reproduced such functions through the rational assembly of dy...
In most gas generator systems, production of gases at low temperature (less than 1000 °C) over a relatively long operation time (between 10 to 300 seconds) is needed. According to studies, composite propellant based on ammonium nitrate as oxidizer, especially AN/HTPB propellant is most commonly propellant used in gas generators. Because of low burning rate (about 2 mm/s at a pressure of 70 ...
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