Dawid Rosiak

Graduates // Dawid Rosiak

Information:

2000-2001 Master's thesis:   “The antioxidant properties of low molecular weight phenolic compounds”

Supervisor: Dr. Anna Krasowska

About:

The thesis describes the characteristics of low molecular weight phenolic antioxidant (PPA-n) directed against oxidation inductors of different hydrophobicity. Experiments were performed on  yeast strains with different lipid composition of cell membranes (Saccharomyces cerevisiae, Rhodotorula glutinis). Conditions for measuring chemiluminescence were established for measuring antioxidant potential of PPA-n compounds.  Two methods for  assessment of antioxidant activity were compared: measuring chemiluminescence and measuring TBRS as end products of lipid oxidation.
Publications

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Author Title Date  
Anna Krasowska
Dawid Rosiak
Katarzyna Szkapiak
Małgorzata Oświęcimska
Stanisław Witek		 The antioxidant activity of BHT and new phenolic compounds PYA and PPA measured by chemiluminescence 2001 ReadExport
Anna Krasowska
Dawid Rosiak
Katarzyna Szkapiak
Marcin Łukaszewicz		 Chemiluminescence detection of peroxyl radicals and comparison of antioxidant activity of phenolic compounds 2000 ReadExport

  • Biosurfactants

    We identified chemical structures of newly isolated biosurfactants which are secreted by Arctic microorganisms. We are investigating their antibacterial, antifungal properties as well as proapoptotic activity. Biosurfactants can be used as an antiseptics.

  • Biogas

    We are investigating and optimizing the efficiency of metanogenesis in bioreactors. We are also testing various substrates (industrial waste) as materials for biogas production. Microorganisms which participate in this process are investigated as e.g. biofilm producers.

  • Bacteriophages

    Bacteriophages or phages are bacterial viruses. We isolated and are now investigating phages which kill Bacillus strains. Beside the basic research, the collection of phages can be used in industry as for example eliminators of infections.

  • Antiseptics

    Fungal infections are difficult to treat because of the small number of effective drugs. Candida albicans resistance depends on the activity of ABC transporters (MDR, CDR). We have investigated strains and methods for finding new antifungal compounds (synthetic and natural) e.g. probiotic yeast Saccharomyces boulardii.