International Journal of Microbiology

Research Article

Antibacterial Potential of Secondary Metabolites from Indonesian Marine Bacterial Symbionts

Table 2

Morphological and biochemical characteristics of the marine bacteria isolates RC1–RC5 and RS1–RS7.
CharacteristicsIsolate
RC1RC2RC3RC4RC5RS1RS2RS3RS4RS5RS6RS7
Gram staining++++++++++++
Spore color            
 ISP1WhiteWhiteWhiteWhiteWhiteWhiteWhiteWhiteWhiteWhiteWhiteWhite
 ISP2GreyGreyPale yellowPale yellowGreyOliveGreyWhiteGreenishPale yellowWhiteWhite
Pigment            
 ISP1ndndnddndndndndndndndnd
 ISP2dndnddnddndddddnd
Melanoid pigmentation            
 ISP1————————————
 ISP2———Brown—Black—OrangeBrownBrown——
NaCl tolerance            
 0% NaCl++++++++++++
 5% (w/v) NaCl++++++++++++
 7.5% (w/v) NaCl+++++++++−−±
 10% (w/v) NaCl++±++++−+−−−
 12.5% (w/v) NaCl++−−−+−−+−−−
 15% (w/v) NaCl−−−−−−−−−−−−
 17.5% (w/v) NaCl−−−−−−−−−−−−
pH tolerance            
 pH 4.0−−−−−−−−−−−−
 pH 5.0++−−+−+−−−−−
 pH 8.0++++++++++++
 pH 9.0++++++++++++
 pH 10.0++++++++++++
 pH 11.0++++++++++++
 pH 12.0++++++++++++
 pH 13.0+++++++++++−
 pH 13.80−−−−−−−−−−−−
Hydrolysis of            
 Protein++−−−++++−−−
 Starch++−+++−+++++
Utilization of carbohydrate            
 D-glucose++++++++++++++++++++
 D-galactose+++++++++++++++++++++++
 D-mannose−−−++−+++++++++++++
 D-arabinose++++−+++++++++++++++
 D-xylose+++−+++++++++++++++
 D-fructose+++++++++++++++++++++++
 Maltose−−−++−+−+++++−
 Dextrin++++++++++++++++++++++
 Inositol++++−++++++++++−
 Sucrose−−−−+++++++−
Note. Sign for pigment tests: d, distinctive; nd, not distinctive. Sign for melanoid pigment: —, no melanoid pigment; sign for salt and pH tolerance: +, growth; −, no growth; sign for the carbohydrate utilization: ++, the isolate growth on tested carbon in the basal medium is equal to or greater than growth on the basal medium plus glucose; +, when the isolate growth on tested carbon in the basal medium was significantly better than that in the basal medium without carbon, but somewhat less than on glucose; —, when the isolate growth was similar to or less than growth in the basal medium without carbon.