ADHESION OFAMYLOLYTIC BACTERIA ON STARCH­ POLYETHYLENE PLASTIC FILMS

ADHESION OFAMYLOLYTIC BACTERIA ON STARCH­

POLYETHYLENE PLASTIC FILMS

BY

MANAL, M. A. EL-NAGGAR*
*lv/icrobiology Department. Environmental Marine Division. iVIOF
Key words: Bacteria – amylase – adhesion – polyethylene films.
ABSTRACT
A compararive study of rheadhesion (ug cm-) of Pseudomonas
slltr~eri and Peanibacillu~: polvmvxa on starch-polyethylene films lIas
made lncubarion ofplasric films was carried Olll ar room Temperal/lre
for .+0 days. in sediment and composT samples. respecm·ely. The
incrcase in Il’cighr of incubared and II’QShed plasric films H’QS
deTermined in jour replica Adhesion 0/ the resTed bacreria on d~fferenl
srarch-pol.vethylene plaStiC films was exmnined undcr The elecl/”on
microscope. The amylase acri”ity of rhe 111’0 bacrerial srrains isolalcd
from composr (Peanibacillus poIn-nvra) and sediment (Pseudo/llonas
sr/l/::eri) was derecred in pure and mixed clIll/Ires. The /lICLrimwlI
speCific amylase acti\ir)’ of The amylolytic bacrcria P anibacillus
po/rmvxa was j -Ijjold higher rhan rhat oj Pseudomonas srJ({::cn
Ilhile mixed cullUres of borh bacreria showed no significanr d~tference
(p< 0. OJ) comparing 1l'irh the amylase activity produced by Peanibaciilus Ro/wlIvxa . The d[fJerent srarch concentrations (00.100 and 20.0 g I) shiNed a Significant effect (p--:o. OJ) on rhe amylase acti,?r} ojrhe rested cultures.