Heavy Metals and Antibiotics Resistance of Halophilic Bacteria Isolated from Different Areas in Red Sea, Egypt.

Document Type : Original Article

Authors

1 Department of Botany, Faculty of Science, Sohag University, 82524 Sohag, Egypt

2 - Department of Botany, Faculty of Science, Sohag University, 82524 Sohag, Egypt - Department of Botany, College of Science, Al-Baha University, Saudi Arabia

Abstract

Hundred and thirty eight (138) bacteria were isolated from 3 different
areas on Red Sea governorate, Egypt. Among these 138 moderately halophilic isolates,
2.17%, 3.6%, 6.5%, 9.4%, and 7.2% of the isolates were resistant up to 5mM Cd2+
and Zn2+ , 20 mM
for Cu2+, Pb2+, and Co2+, respectively. The
majority of halophilic bacterial isolates showed resistance to more than 10 mM
to these metals except Cd2+. All strains were resistant to lead,
whereas 50% only of the strains were resistant to cadmium. The resistance to (Cd2+ + Cu2+); (Zn2+
+ Cu2+) showed the highest values between bacteria (6.5%), whereas
4.34% of the isolated strains were resistant to (Cd2+, Zn2+)
and (Zn2+ + Pb2+), but 2.17% of the isolates were
resistant to 3 metals (Cd2+, Zn2+ , Cu2+); (Zn2+
, Cu2+, Co2); (Cu2+, Co2+, Pb2+)
and resistant to 4 metals (Zn2+ , Cu2+, Co2+,
Pb2+); (Cd2+, Zn2+ Cu2+, Co2);
(Cd2,Zn2+ , Cu2+, Pb2+); (Zn2+,
Pb2+ ,Cu2+, Co2). No bacterial isolates were
resistant to the 5 metals combined. The isolated halophilic bacteria exhibited sharp peaks of
resistance to drugs such as: Velosef 95%, Cceftriaxone, 91.66%, Ampicillin
83.33 %, Nitrofurantion 81.66%, Tarivid 80%, Cephalothin 73.33%, Cephalexin
66.66%, Cefadroxil 83.33%, and Flucloxacillin 85% whereas  few 
isolates (6.6%)  were  resistant 
to  Vancomycin.  

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