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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Microalgae Chlorella sp. as an Alternative Source of Fermentable Sugars
 Maršálková, B. ; Širmerová, M. ; Kuřec, M. ; Brányik, T. ; Brányiková, Irena ; Melzoch, K. ; Zachleder, Vilém
The aim of this work was to optimize the enzymatic hydrolysis of starch originating from microalgae (34.0 +/- 1.2% wt. starch in the dry algal biomass) grown on flue gas from waste incineration plant and to study the influence cell disintegration method on the yield of hydrolysis. Apart from the starch, the possibility of cellulose usage from microalgae cell wall as a further source of fermentable sugars was studied and preliminary results are presented.
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Adhesion of microalgae Chlorella vulgaris to solid surfaces
 Širmerová, Marcela ; Vymazal, Jan (advisor) ; Mojmír, Mojmír (referee)
Although adhesion of bacteria and yeast have been extensively studied by a wide range of experimental and theoretical approaches, significantly less attention has been focused on microalgal adhesion to solid materials. Therefore this doctoral thesis is focused on physico-chemical aspects of microalgal adhesion. The results are based on experimental characterization of surface properties of both microalgae and solids by contact angle and zeta potential measurements. These data were subsequently used in modeling the surface interactions (thermodynamic, classical and extended DLVO models) resulting in quantitative prediction of the interaction intensities. Finally, the model predictions are compared with experimental adhesion tests of microalgae onto model solids in order to identify the physico-chemical forces governing the microalgae-solid interaction. The model solids were prepared in order to cover a wide range of properties (hydrophobicity, surface charge). The results revealed that in low ionic strength environment the adhesion was influenced mostly by electrostatic attraction/repulsion between surfaces, while with increasing ionic strength grew the importance of apolar (hydrophobic) interactions. Among tested materials the highest adhesion of Chlorella vulgaris cells was observed to (3-aminopropyl)triethoxysilane modified glass (APTES glass) mimicking the surface properties of stainless steel. The impact of solid surface properties on the degree of colonization by microlagae was statistically more significant than the influence of culture medium composition on cell surface of Chlorella vulgaris.
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1 Širmerová, Marcela
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