Structural Biochemistry/Free energy - Standard Gibbs Free Energy of Formation. 1  When we have to consider the relationship between Gibbs free energy and the standard-state free energy of a reaction, we use this equation... 2  to calculate Gibbs free energy at that of time under a specific circumstances.
digestive system definition. The organs and glands in the body that are responsible for digestion. The digestive system begins with the mouth and extends through the esophagus, stomach, small intestine, and large intestine, ending with the rectum and anus. Other organs in this system include the liver, pancreas, gallbladder, and appendix.
tract-a bundle of myelinated nerve fibers following a path through the brain. nerve pathway, nerve tract, pathway. optic radiation, radiatio optica-a nerve pathway from the lateral geniculate body to the visual cortex. commissure-a bundle of nerve fibers passing from one side to the other of the brain or spinal cord.. a. An expanse of land or water. b. A specified or limited area of land: developing a 30-acre tract. 2. Anatomy. a. A system of organs and tissues that together perform a specialized function: the alimentary tract.