Free Energy

In the past few years, much effort has been paid to explain the above interesting phenomena [7, 16 - 20, 26, 27]. The moisture distribution in the crystal structure of AQP 1 indicates that the probability of proton transport through the channel is small [7]. Molecular Dynamics (MD) simulation [23, 24, 28 - 31] using polymorphic empirical valence bond (MS - EVB) model described the primitive nature of the proton blocking behavior in the AQP 1 channel [18 , 19]. The free energy barrier to proton penetration in wild type AQP1 is derived from the selective filter (SF) domain of the extracellular orifice consisting of the contractile region or residues Phe 56, His 180, Cys 1.

Historically, the term "free energy" has been used in all quantities. In physics, free energy refers to the Helmholtz free energy most often represented by A or F. On the other hand, in chemistry, free energy mostly refers to Gibbs free energy. The values ​​of the two free energies are usually very similar, and the expected free energy function is also usually included in manuscripts and presentations. The basic definition of "energy" is the ability to measure changes in the body (thermodynamics, systems). For example, when a person presses a heavy box of several meters forward, he personally puts a mechanical energy on the box a few meters away. This is also called work. The mathematical definition of energy of this form is the product of the force applied to the object and the distance the box travels (work = force x distance). Since a person changed the stationary position of the box, a person added energy to the box.

State function of free energy, thermodynamics, energy state or thermodynamic equilibrium system. Free energy has the dimension of energy, its value depends on the state of the system, not its history. You can use freedom to determine how the system changes and how much work they can produce. It is expressed in two forms, Helmholtz free energy F, also called work function, Gibbs free energy G. If U is the internal energy of the system, PV is the pressure volume product and TS is the temperature entropy product (T is a temperature exceeding absolute zero and F = U - TS, G = U + PV - TS. Can also be written in the form G = H - TS where H = U + PV is. Free energy is a broad property whose size is the amount of material in a given thermodynamic state depends on.

Thermodynamic free energy is a useful concept in the thermodynamics of chemical or thermal processes in engineering and science. Changes in free energy are the maximum amount of work a thermodynamic system can perform at a given temperature, which signifies whether the process is thermodynamically favorable or prohibited. As free energy usually contains potential energy, it is not absolute and depends on the choice of zero. Therefore, only the change in relative free energy or free energy has a physical meaning.