Temperature Effect on the Basis States for Charge Transfer Through a Polypeptide Fragments of Proteins and on the Nanocurrent in It

摘要

13.1 Introduction Transfer of energy or charge transport in the polypeptide fragments of protein molecules is increasingly frequently analysed [1] taking into account the actual structure of these fragments, particularly, finite length of the a-spiral section [2], and other factors, which are inherent in general to the physical objects containing carbon [3-5]. The processes, which occur in the course of the donor-acceptor electron transfer between organelles of those cells (polypeptide fragments of protein molecules), particularly, influence of temperature upon these processes, are already sufficiently investigated [6]. These polypeptide fragments can be used in the nonnative state in the perspective as nanowires of the semiconductor nature in the nanodevices, as, for example, in [7-9]. The problem concerning mechanisms of electron transfer over these organelles in the idealised conditions of zero temperature was analysed in detail in [10, 11]. Particularly, average-electron structure and average-nuclear structure of the protein molecule were analysed in detail in article [10]. On the basis of this analysis in article [11], a check calculation of current density was carried out at the zero temperature in the conditions of complete absence of the factors, which violate electrostatic equilibrium of the system and may be interpreted as external fields. As opposed to article [11], such calculation was carried out in the present article as well, but it was carried out on the condition that the influence of the nonzero temperature upon the electron subsystem of the polypeptide fragments of protein molecules was taken into account. It was shown that at T ≠ 0 various power-law dependences are realised in practice between the energetic positions of each separate state in the conduction band and the temperature, but all of them are in proportion to factor 227°/T. In spite of this fact, all these states taken together ensure the absence of current in accordance with the abov