Biofilms are surface-attached
accumulations of
microbial cells encased in extracellular polymeric substances. They can
be
found at virtually any surface exposed to water, ranging in thickness
between a
few cell layers to a few centimeters. In many aquatic systems the
majority of
microbial conversions takes place in biofilms covering sediments,
rocks, or
plants. A combination of microsensors and molecular techniques allows
for true
in situ investigations of microbial processes and populations in these
special
habitats Our research concentrates on (i) nitrifying/denitrifying
biofilms from
wastewater treatment plants (biofilm reactors), and (ii) epiphytic
biofilms on
spruce needles and their interaction with aphids.