An additional advantage of the bacterial model is its independence on mature individuals

that are able to produce germs (sexually or asexually), i.e. the range of full-formed phenotypes is much greater and can be influenced towards many ends (plasticity).   2. Ontogenesis of a colony (starting either from a single cell or from an assemblage of cells), similarly to the development of multicellular eukaryotic bodies, proceeds in two stages: the first stage must be thoroughly insulated from the rest of the biosphere and find more relies to intrinsic settings of the developing germ; in the second stage, the germ establishes its bounds with its environment, and plastically reacts to outside cues. In chimeric assemblages where the first phase is wrecked, the mix is unable to establish germ(s) and proceed towards a colony, and develops

toward a simple bacterial consortium. Such an “ecosystem” allows detailed study of how different lineages implement their fitness in a given context.   We bring here examples of model settings allowing, in further research, detailed studies of ontogenies and ecologies on the dish. Methods Media PB : phosphate buffer as described in Rieger et al.[20].NA: Nutrient Agar No2 (Imuna Pharm a.s.,) supplemented. For growth in suspensions Nutrient broth No2 (NB) was used (Imuna Pharm a.s.,), of identical composition, but without agar. NAG: NA enriched www.selleckchem.com/products/cilengitide-emd-121974-nsc-707544.html with glucose (Sigma; 0.27 mM; 2.7 mM; 27 mM; 54 mM). In some experiments, NA was enriched with manitol (Sigma; 27 mM), sorbitol (Sigma; 27 Mm), or 6% (w/v) polyethylene glycol (Sigma; mw 6000). In all such cases, the osmotic potential was identical: 0.08 MPa. Analogically,

glucose-enriched broth (NBG) was used for cultivations in suspension. TN: 10 g Trypton (Difco), 5 g NaCl (86 mM), 1.5% Agar (Oxoid No Org 27569 1). Add 1000 ml H2O. Minimal medium MM: 21 mM KH2 PO4, 48 mM Na2HPO4, 8 mM NaCl, 18 mM NH4Cl, 3.9 mM MgSO4, 27 mM glucose. Minimal medium MMA: 1.5% agar in MMA. Bacteria The strain S. rubidea here labeled R was obtained from the collection of the Department of Genetics and Microbiology, Faculty of Sciences, Charles University. The strain S. marcescens CNCTS 5965 was obtained from the Czech National Institute of Health [20]. The identity of strains was confirmed by MALDI – TOF method, using Bruker Daltonik MALDI Biotyper (performed by A. Nemec, National Health Institute, Prague); the scores assigned to particular strains of S. rubidaea (R = 2.241, W = 2.214) and S. marcescens (F = 2.151, Fw = 2.212 and M = 2.168) indicate very high probability of correct determination. It is to be stated that in the previous work, the morphotypes F and Fw were erroneously determined as belonging to S. rubidaea species.