**5. Conclusions**

Based on numerous literature reports, it can be said that ethyl alcohol shows biophysical effects on lipid membranes. In this paper, both experimental and theoretical data demonstrated that the electrical properties of blood cell membranes (erythrocytes and thrombocytes) are changed upon fatal alcohol poisoning. We observed changes in all determined parameters, *cA*, *cB*, *KAH*, and *KBOH*. Interactions among membrane components (lipids and proteins) and between these components and their surroundings lead to variations in the number and kind of functional groups present, which results in changes in *c<sup>A</sup>* and *c<sup>B</sup>* and in the values of association constants. Also, sialic acid, a component of glycoproteins and glycolipids, may influence all these parameters in fatal ethyl alcohol poisoning. Understanding some of the physical and chemical processes occurring in the human body after death is essential in describing the pathophysiology of fatal ethyl alcohol poisoning deaths. A quantitative description of the phenomena occurring on the blood cell membrane surfaces and the obtained parameters characterizing the existing equilibria (*cA*, *cB*, *KAH*, and *KBOH*) may provide essential information for forensic medicine. We want to emphasize that our theoretical descriptions are innovative and the research carried out is quite preliminary. Still, because the obtained data may help solve many forensic medicine problems, there is no doubt that there is a necessity for continuation of this research.

**Author Contributions:** Conceptualization, M.S. and A.D.P.; methodology, J.K. and A.D.P.; validation, M.S., J.K., and A.D.P.; formal analysis, J.K. and A.D.P.; writing—original draft preparation, M.S., J.K., A.N.-J., A.D.P.; writing—review and editing, M.S., J.K., A.N.-J., and A.D.P.; visualization, M.S. and A.D.P.; supervision, A.D.P. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the The Ethics Review Board of the Medical University of Bialystok approved the conducted research (No. R-I-002/533/2010).

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** The data presented in this study are available on request from the corresponding author.

**Acknowledgments:** The Zetasizer Nano ZS apparatus was funded by the European Funds for Regional Development and the National Funds of the Ministry of Science and Higher Education as part of the Operational Program Development of Eastern Poland 2007–2013 [POPW.01.03.00-20-044/11].

**Conflicts of Interest:** The authors declare no conflict of interest.
