surface topography on biofilm formation

[tezuka]

i have recently seen an article on "Impact of engineered surface microtopography on biofilm formation of Staphylococcus aureus"

 

and they use a shark skin to actually how does a biofilm forms and weather it encourage of discourage the growth of biofilm. my question is, why does microbes grow well on certain surface and not on others and what are the types of surface that can promote/inhibit microbial adhesion and proliferation.

 

 

my second question, what does wettability means?