|
|
Chemical signaling among microorganisms
Karásek, Filip ; Palková, Zdena (advisor) ; Převorovský, Martin (referee)
The work summarizes the knowledge about chemical communication among microorganisms, focusing mainly on the quorum sensing phenomenon, but briefly discussing also other molecules with signaling function. The work presents fundamental information on quorum sensing and some other signaling molecules in selected grampositive and gramnegative bacteria and in yeast. It also describes an universal system of communication among different bacteria and briefly mentions communication between bacteria and yeast. Key words: Quorum sesnig, signal molecule, signal pathway, bacteria, yeast, communication
|
|
|
Morphogenesis of the bacterial colonies and their mutually influencing
Rieger, Tomáš ; Markoš, Anton (advisor) ; Rulík, Martin (referee) ; Kuthan, Martin (referee)
This thesis follows previous works of our group (Rieger T. et al., 2008; Cepl J. et al., 2010 and Patkova I. et al., 2012), where we focused on the morphology of the bacterial colonies Serratia marcescens and its variety caused by changing of the inoculation conditions on nutrient agar. When bacterial colonies S. marcescens are grown on nutrient agar enriched with glucose isolated enough from other colonies in its living space, it can form coloured structured colonies, which we named morphotype "fountain" (F). This morpotype becomes ideal for following studies of mutual influencing of the bacterial colonies, because of its ability of pigmentation change or structure loss caused by altering surrounding inoculation conditions. We noticed in normal sowed agar plates, that bacterial colonies, which grows in the close distance with other colonies develop their pigmentation sooner, than colonies, that grows more isolated. We studied how is this influencing happening and what are the necessary conditions for it. We proved, that different species of bacterial macrocolonies (S. marcescens - morphotype (M), S. rubidea and E. coli) emits into the nutrient agar informative signal, which makes the recipient colonies S. marcescens reacts on this signal with the same manner (X structure). It looks, that this is...
|
guest ::
