20171025 plan 
12:30, Sala: S3 im. W. Fiszdona, piętro III dr Filippo Pierini IPPT PANElectrospinning of conjugated polymer nanofibers: research challenges and applications Conjugated polymers are a class of organic macromolecules with large πconjugated polymer chains due to a backbone chain of alternating double and singlebonds. The highly electrondelocalized structures generated by the overlapping of porbitals create systems with fascinating electronic and optical properties. Conjugated polymer nanomaterials have been shown to be promising for advanced organic electronic, photovoltaic and biomedical applications. Electrospinning is the most efficient technique for elongating and aligning polymer chains to form nanofibers with a welldefined structure. This technique is particularly interesting in order to fabricate continuous polymer 1D nanostructures with controllable composition, structure and properties. Chemical and physical properties of conjugated polymer nanofibers could be modulated by controlling their hierarchical structure by way of electrospinning [13]. The major challenge in the development of these materials has been obtaining a balance between polymer properties and spinnability. During this seminar, a brief overview of conjugated polymer material properties will be presented. In the second part, principles of the electrospinning of conjugated polymer will be discussed. Finally, recent results on the development of electrospun nanofiberbased devices and their applications will be demonstrated [4]. REFERENCES [1] F. Pierini et al., “Electrospun poly(3hexylthiophene)/poly(ethylene oxide)/graphene oxide composite nanofibers: effects of graphene oxide reduction", Polymers for Advanced Technologies, 27 (2016) 1465–1475. [2] F. Pierini et al., “Comparison between inorganic geomimetic chrysotile and multiwalled carbon nanotubes for the preparation of onedimensional conducting polymer nanocomposites”, Fibers and Polymers, 16, (2015) 426433. [3] F. Pierini et al., "Electrospun polyanilinebased composite nanofibers: tuning the electrical conductivity by tailoring the structure of thiolprotected metal nanoparticles", Journal of Nanomaterials, 6142140 (2017) 10. [4] F. Pierini et al., “Singlematerial organic solar cells based on electrospun fullerenegrafted polythiophene nanofibers” Macromolecules, 50, 13 (2017) 49724981. 
20171018 
12:30, Sala: S3 im. W. Fiszdona, piętro III dr inż. Izabela Piechocka IPPT PANThe effect of shear flow on fibrin clot structure and fibrinplatelets interactions Fibrin and platelets are the two main components involved in blood clot formation, preventing bleeding and promoting wound repair. In vivo, the formation of blood clots takes place in the presence of flowing blood that exerts a continuous shear force on the whole structure, influencing its mechanical properties such as extensibility and resistance. The exact role of the shear flow in bulk organization of fibrin networks and in fibrinplatelet interactions at the nanometer scale still remains, however, unexplored. Here, by bring together parallelplate flow chamber (PPFC) together with confocal microscope, we plan to follow in situ changes in fibrin network structure at the bulk level and the level of individual fibrin filaments. By using combination of PPFC together with superresolution microscopy techniques such as stimulated emission depletion microscopy (STED) or stochastic optical reconstruction microscopy (STORM), we plan to uncover the role of shear flow in spatial organization of fibrinplatelet adhesion receptors. Such fibrinplatelets model system will closely mimics the in vivo
situation of blood clots, providing a crucial insight into the role of shear flow in the extracellular matrix (ECM)cell interactions which is important in light of the biological function of blood clots. 
20171011 
12:30, Sala: S3 im. W. Fiszdona, piętro III dr hab. Piotr Korczyk IPPT PANSelfcounting droplets and other microfluidic curiosities Integrated logic elements with embedded digital operations into the structure of the device has been successfully implemented in electronics, becoming one of the pillars of the information revolution.About one decade ago Manu Prakash demonstrated, that single fundamental logic operations can be implemented in the twophase microfluidic flows due to the utilization of nonlinearity introduced by surface interactions. Those findings raised a hope that further integration of these base units would enable construction of architectures inducing programmed cascades of digital operations on droplets or bubbles. That approach would pave the way for autonomous microfluidic systems with all analytical procedures hardwired into the structure of the device. However, until now there is a lack of examples of realization of that promising idea.Herein we show the new approach to the construction of microfluidic geometries, which perform the logic operations on sequences of droplets. We explain the working principles and, what is most important, we demonstrate that those single units can be successfully arranged into larger systems performing sequences of operations. Finally, we demonstrate the examples of encoding of the digital procedures of counting of droplets in both binary and decimal systems. In our microfluidic architectures, some of the droplets flowing into the counter play a role of indicators and their positions correspond directly to the current count of all flowing droplets. Such microfluidic counters can be arranged in series to count a custom number of droplets. We show and test a few construction of the counters, which can count reliably up to 1000 droplets. Presented devices show the fascinating aspect of microfluidics, where continuous flows of liquids crossed in microfluidic junction spontaneously transform into the discrete droplets and then these droplets perform digital computations. 
20170929 
12:30, Sala: S3 im. W. Fiszdona, piętro III Prof. Jochen Rink Max Planck Institute of Molecular Cell Biology and Genetics Dresden, GermanyPattern establishment and scaling in planarians Planarian flatworms are astonishing creatures. They have the ability to regenerate complete and perfectly proportioned individuals from tiny tissue fragments. They grow when fed and literally shrink when starving, continuously varying their body size between less than one mm and several cm in length. Abundant pluripotent adult stem cells serve as sole source of new cells and their continuous divisions continuously renew all organismal cell types. Such unique biology epitomizes a fascinating challenge: How to regenerate, maintain and scale form and function of a triploblastic body plan? My lab approaches this problem from multiple angles, including the patterning systems specifying the body plan, the multilevel control of organismal growth dynamics and via the comparative analysis of our large live collection of planarian species. We recently found that the planarian A/P axis is patterned by a selforganizing Wnt gradient deployed from the tail tip, which exists in mutual antagonism with a similar patterning system deployed from the head. Current work addresses the transformation of the signaling gradients into cell fate choices and the evolutionary changes in the signaling network that ultimately explain why some planarians regenerate, while others do not. 
20170926 
10:30, Sala: S3 im. W. Fiszdona, piętro III Chris Trombley IPPT PANStability And Earnshaw’s Theorem In A Viscous Fluid Seminarium w ramach przeglądu wyników doktorantów uzyskanych w 2016/17. 
20170913 
12:30, Sala: S3 im. W. Fiszdona, piętro III Paramita Chatterjee IPPT PANMathematical analysis of a limb growth model Seminarium w ramach przeglądu wyników doktorantów uzyskanych w 2016/17.
Vertebrate limb development is an important example of organogenesis. In [1], Glimm and coauthors proposed a new model related to bone formation based upon the results of an experimental paper [2]. It diﬀers signiﬁcantly from any previously discussed model of growing limb. In [2], a crucial role of new morphogens regulating the cells aggregation and bone formation during avian limb growth has been reported. The main mathematical feature of the Glimm’s model is that it is described by a system of equations which are neither parabolic nor hyperbolic. Here we propose a possible approach of the model analysis.
1. T. Glimm, R. Bhat, S.A. Newman, Modeling the morphodynamic galectin patterning network of the developing avian limb skeleton,J.Theor. Biol.,346(2014), pp. 86108.
2. Bhat, R., Lerea, K.M., Peng, H., Kaltner, H., Gabius, H.J., Newman, S.A., A regulatory network of two galectins mediates the earliest steps of avian limb skeletal morphogenesis, BMC developmental biology, 11(1), (2011), 1. 
20170628 
12:30, Sala: S3 im. W. Fiszdona, piętro III prof. Jerzy Bławzdziewicz Department of Mechanical Engineering, Texas Tech University, Lubbock, TX, USAGeometry and mechanics in soft biological matter: an analysis of nematode locomotion and fruit ﬂy morphogenesis The interplay between geometry and mechanical forces plays a subtle but very important role in diverse biological systems. In our ﬁrst example we will focus on locomotion of the nematode C. elegans in 2D and 3D environments. We will investigate optimization and neuromuscular control of nematode gait patterns in diﬀerent media; we also discuss the geometry and biomechanics of its turning maneuvers. The second example will center on the formation of embryonic architecture during fruit ﬂy morphogenesis; in our analysis we argue that mechanical feedback is crucial for robustness of morphogenetic movements.

20170621 
12:30, Sala: S3 im. W. Fiszdona, piętro III mgr Karol Nienałtowski IPPT PANQuantitative methods for analysing cellular signalling Seminarium w ramach przeglądu wyników doktorantów uzyskanych w 2016/17.
The complexity of biochemical signalling induce usage a combination of tailored experimental measurements with quantitative approaches for better understanding signalling mechanisms. My research is focused on: (1) development software for quantification of highthrougput single cellmeasurements and (2) mathematical methodology for analysing signalling mechanisms. We proposed nonparametric modelling method for reconstructing trajectory of cellular response to the stimuli from singlecell snapshot data. Moreover, we work on developing stochastic models of interferones signalling in normal cell lines of human lung epithelium as well as in human nonsmall cell lung cancer cell lines that combine intrinsic and extrinsic sources of cellular variability. During the seminar I will present previous results of my PhD project and plan of work for the next year. 
20170614 
12:30, Sala: S3 im. W. Fiszdona, piętro III Professor Krzysztof Kuczera Departments of Chemistry and Molecular Biosciences The University of Kansas, Lawrence, USAModeling peptide solvation by denaturing and protective cosolvents 
20170426 
12:00, Sala: S3 im. W. Fiszdona, piętro III mgr Marek Bukowicki IPPT PANDynamics of settling pairs of elastic particles at low Reynolds number regime I will discuss dynamics of symmetric pairs of particles, settling in viscous fluid. Results for two regimes will be presented: the system of rigid particles, where periodic solutions are observed, and the system of elastic particles. 
20170320 
14:30, Sala: S3 im. W. Fiszdona, piętro III dr inż. Marta Grodzik Zakład Nanobiotechnologii, SGGWAntyglejakowa terapia grafenem  nadzieje i obawy 
20170111 
12:30, Sala: S3 im. W. Fiszdona, piętro III dr Gustavo Abade Institute of Geophysics, University of WarsawActive microrheology in a colloidal glass of hard spheres The talk will address the dynamics of a probe particle driven by a constant force through a colloidal glass of hard spheres. This nonequilibrium and anisotropic problem is investigated using a new implementation of the modecoupling approximation with multiple relaxation channels and Langevin dynamics simulations. An important feature of the system is the critical force, above which the probe delocalizes. Friction coefficients of delocalized probes decrease with force, indicating forcethinning behavior. Probe van Hove functions predicted by the theory show exponential tails reminiscent of an intermittent dynamics of the probe. This scenario is microscopically supported by simulations. 
20161221 
12:30, Sala: S3 im. W. Fiszdona, piętro III dr Karol Makuch Instytut Chemii Fizycznej PANSpeed of flow of nonwetting droplets in capillaries of circular crosssection We measure mobility of long droplets in circular microfluidic channels. Using oil as a continuous phase and aqueous solutions of glycerol with die as droplet phase, we determine mobility for the range of values of the capillary number Ca∈(〖10〗^(5),〖10〗^(2) ) and ratio of viscosities of the droplet and continuous phase λ∈(0.25,10).
To explain the results of our experiments, we also introduce approximate method of calculation of the speed of viscous droplets. This theoretical approach is based on lubrication approximation.

20161214 
12:30, Sala: S3 im. W. Fiszdona, piętro III dr Paweł Żuk IPPT PANOn the viscosity of rigid models of molecules The viscosity of complex fluids very strongly depends on their composition. For many medical and technological applications it is important to know how does the macroscopic viscosity change with the shape of suspended molecules. We will show ho to calculate the viscosity of macromolecules modeled as bead modes and treat some artificial problems that can be found in the literature like "the center of viscosity".

20161116 
12:30, Sala: S3 im. W. Fiszdona, piętro III Damian Zaremba IPPT PANDesign of a control and signal processing module for an experimental research ultrasound system and its implementation in a FPGA device.  Master Thesis presentation Aim of this thesis is design of a control and signal processing module of ultrasound 2D imaging system and its implementation in FPGA Xilinx Artix7. Thesis is a part of work in project of student scientific group "BioSon". It is carried out at Faculty of Mechatronics, Warsaw University of Technology.
Task of the control module is configuration and synchronization of the signal processing modules, a user interface and peripheral devices embedded in the ultrasound system. It has been implemented as software running on an embedded system. Embedded system is based on Leon3/GRLIB project.
The signal processing module operates on a single line of RF signal. The RF signal is preprocessed in FrontEnd block and it is an output of the beamformer. Operations of filtration, various kinds of envelope detection and compression of an amplitude are used to processing this signal in implemented module.
The Research task was to examine accuracy of estimation envelope of RF signal and resources utilization of FPGA by proposed methods. 
20161109 
12:30, Sala: S3 im. W. Fiszdona, piętro III Chris Trombley, M.Sc. IPPT PANInteraction of a Straight Line Current with a Superconducting Sphere An analytical expression for a scalar potential for a current line near a grounded sphere is obtained. This is an exact solution for a model of a superconducting sphere in the Meissner state which gives expressions for not only the scalar potential, but also the magnetic field and the force. This solution is derived in a way analogous to the hydrodynamic problem of a spherical blockage near a vortex line in a potential flow. This method avoids both guesswork and complicated series expansions, and also results in simple expression for the solution. Once the solution is obtained, both its symmetries and its dependencies of the result on model parameters will be explained. The behavior as the line current approaches the sphere will also be explored. 
20161026 
12:30, Sala: S3 im. W. Fiszdona, piętro III dr Marta Waclawczyk IGF UWLie point symmetries and invariant solutions of equations for turbulence statistics Although the evolution of turbulent velocity field is governed by the deterministic NavierStokes equations, due to its sensitivity to small variations in the initial and boundary conditions turbulent field may be treated as a stochastic field. For its statistical description joint probability density functions (pdf's) of velocities in different points of the flow are needed. Transport equations for such pdf's form a system of infinitely many equations where in the nth equation for npoint pdf an unknown pdf in (n+1) points is present.
In the first part of the talk theoretical description of turbulent flows and mathematical analysis of the infinite system for pdf's with the use of the Liegroup method will be addressed.
Next, possible applications of this theoretical study to derive invariant solutions for turbulence statistics and invariant turbulence closures will be discussed. 