Morphological diversity of Rhodococcus erythropolis IEGM 201 colonies depending on the carbon source used: A – a mixture of n-dodecane and n-heptadecane; B – a mixture of n-hexadecane, n-octadecane, n-nonadecane, and n-eicosane; C – a mixture of n-pentane, n-hexane, n-heptane, n-undecane, and n-tetradecane