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Research Programmes

 

Experimental Biophotonics

Prof. RNDr. Radim Chmelík, Ph.D.
Research Group Leader

THEMATIC RESEARCH FOCUS

RESEARCH AREAS

  • Imaging process in advanced, especially holographic and confocal light microscopy: theory, simulation and experimental verifi cation
  • Coherence effects, optical and coherence vortices in holographic imaging
  • Coherence controlled optical systems for holographic and multimodal (correlative) microscopy
  • Advanced image-processing methods: digital holographic reconstruction and numerical focusing with low coherence, phase unwrapping in presence of coherence vortices dynamical phase diff erences, pattern & process recognition
  • Biophysics of quantitative evaluation of live cell behaviour developed by coherence-controlled holographic microscopy (CCHM)
  • Subtoxic impact/toxicity of nanomaterials assessment by measurement of intracellular dry mass translocation by CCHM
  • Observation and validation of nanostructures properties by advanced light microscopy
  • In vitro qualification of cancer cell malignancy by CCHM classifi cation of cell behaviour patterns

MAIN OBJECTIVES

Research and development of analytical and measurement methods

Experimental Biophotonics is focussed on advanced light microscopy techniques and methodologies applied to study of nano- and microstructures characteristics and interactions with living cells including assessment of possible cytotoxicity and cancer cell diagnostics.

CONTENT OF RESEARCH

Research and development of instruments and methods for the investigation of nanomaterials and nanostructures

Optical methods

The development of the methodology for photoluminescence and refl ection optical microscopy and spectroscopy of nanosystems (including near-fi eld methods).

The development and application of confocal and holographic microscopy and optical spectroscopic methods (ellipsometry and spectrophotometry) in a wide spectral range from vacuum ultraviolet (VUV) to infrared (IR) range.

The development of structural and dispersion models and software for the analysis of these measurements.

Experimental biophotonics work is focussed to the segment of development and application of confocal and holographic microscopy focussed on nano- and microstructures characterisation and their interactions with living cells including assessment of possible cytotoxicity, and on applications to in-vitro cancer cell biology.

KEY RESEARCH EQUIPMENT

PLANNED RESEARCH INFRASTRUCTURE

Core Facilities

The research group will be one of the principal users of the equipment available within CEITEC Nanolithography and Nanofabrication and Nanocharacterisation Core Facilities.

Technology Units

Experimental biophotonics

CURRENT RESEARCH INFRASTRUCTURE

Complete equipment for research and development in the field of advanced light microscopy: design and simulation software, optical tables, opto-mechanical components, optical kits, halogen, xenon and laser sources, digital cameras.

First generation of CCHM: reflected-light CCHM, transmitted-light CCHM adapted for live-cell time-lapse observations.

Basic facilities for cell-culture (GMO approved) and sample preparation: biohazard box, thermal box, inverted phase-contrast microscope.

Microscopes: Nikon Eclipse L150 with reflected light: BF, DF, DIC, fluorescence microscopy, Nikon Alphaphot 2, tandem-scanning reflected-light confocal microscope Confocal 2002.

MAIN PROJECTS

  • Image reconstruction of three-dimensional objects by the methods of the holographic confocal microscopy (GA202/04/1410), Czech Science Foundation, 2004-2006, R. Chmelik, Brno University of Technology.
  • The signifi cance of fast intracellular motile reactions in living cells (GA304/99/0368), Czech Science Foundation, 1999-2001, R. Chmelik, Brno University of Technology.
  • Validation of digital holographic microscope in investigations of living cell dynamics & completion of new multifunctional instrument (GA202/08/0590), Czech Science Foundation, 2008-2010, R. Chmelik, Brno University of Technology.
  • Inorganic nanomaterials and nanostructures: fabrication, characterization, properties (MSM0021630508), Ministry of Education, Youth and Sports, 2005-2011, J. Cihlař, Brno University of Technology.
  • Engineering of the porcine genome for xenotransplantation studies in primates: a step towards clinical application (Xenome; 037377), FP6, EU, 2006-2012, Azienda Ospedaliera di Padova (coordinator).

SELECTED PUBLICATIONS

  • BOUCHAL, P., KAPITAN, J., CHMELIK, R., BOUCHAL, Z. Point spread function and two-point resolution in Fresnel incoherent correlation holography. Optics Express. 2011, 19(16), p. 15603-15620.
  • TOLDE, O., ROSEL, D., VESELY, P., FOLK, P., BRABEK, J. The structure of invadopodia in a complex 3D environment. Eur J Cell Biol. 2010, 89(9), p. 674-680.
  • KOLMAN, P., CHMELIK, R. Coherence-controlled holographic microscope. Optics Express. 2010, 18(21), p. 21990–22003.
  • JANECKOVA, H., VESELY, P., CHMELIK, R. Proving Tumour Cells by Acute Nutritional/Energy Deprivation as a Survival Threat: A Task for Microscopy. Anticancer Research. 2009, 29(6), p. 2339–2345.
  • CHMELIK, R. Three-dimensional scalar imaging in high-aperture low-coherence interference and holographic microscopes. Journal of Modern Optics. 2006, 53(18), p. 2673–2689.