Title: Numerical analysis of the adhesive interaction of bacterium and glass surface

Biography:

Raimondas Jasevičius has completed his Ph.D. in 2011 from Vilnius Gediminas Technical University (VGTU) and received postdoctoral studies from Vilnius University in 2013-2015. Also, he has earned DAAD internship at Otto von Guericke University in 2007. Currently, he is the senior researcher at VGTU. He has built bacterium interaction models for numerical simulations. The models are able to describe the bacterium interaction process. He published more than 18 papers in reputed journals

Abstract

Understanding of influence of bacterial adhesion opens a new possibility to analyze the bacterial mutual interaction as well as the interaction of bacterium with various surfaces. Contrary to their lower inertia, bacteria have the ability to stick to surfaces due to adhesive forces. This characteristic opens up the opportunity to understand adhesive ultrafine particles by numerical modeling the sticking ability. The interaction of adhesive spherical S. aureus under impact is investigated numerically by applying the discrete element method. An adhesive dissipative contact model is applied by implementing different interaction forces, such as the influence of electrostatic double layer force. Normal loading is represented by taking into account the elastic Hertz contact model as well as elastic-plastic Tomas model. Viscous damping is described by the modified nonlinear Tsuji model. Energy dissipation model related to change of influence of adhesion is given. This model is important to predict critical bacterial sticking velocity. The influence of deformation dependent adhesion forces for a bacterium is also illustrated during the deformation process. Elastic-plastic bacterium interaction model is given. This model is important to describe non-elastic deformation behavior of heterogeneous cell. The presented model also includes the ability to obtain sticking process for bacteria. Such model can be adapted for modeling of group of microorganism mutual interaction, such as biofilm formation or infection transmission. Dissipative interaction is described during bacterium interaction with a surface at a distance as well as during the deformation process.