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In this study, the bacterial isolate HI6 was recovered from the ice of the Hopar (Bualtar) glacier, Karakoram Mountain Range, Pakistan. Isolate HI6 was identified as Serratia marcescens through microscopic and molecular analysis (16S rRNA sequencing). Serratia marcescens HI6 was analyzed for different physiological characteristics including temperature, pH and culture media. Serratia marcescens HI6 showed best growth at 25°C, on LB medium and pH 7. In addition, the Fatty acid methyl ester (FAME) was extracted and subjected to Fourier Transform infrared (FTIR) and Gas chromatography/mass spectroscopy (GC/MS) analysis. FTIR and GC/MS analysis has revealed that cell membrane of Serratia marcescens HI6 contains various types of fatty acids (FA). i–C16:1 (35.3% out of total cell membrane fatty acids) was found most predominantly followed by i–C15:1 (18.5%) and n-C16 (13.2%). Moreover, branched fatty acids (62%) including monounsaturated fatty acids (MUFA) (e.g. i– C15:1 and i–C16:1) and saturated fatty acids (SFA) were the dominant types of fatty acids in the cell membrane. A polyunsaturated fatty acid (PUFA), C18:2(cis–9) (known as linoleic acid) was also detected among analyzed fatty acids.

applied ecology and environmental research

ANALYSIS OF THE CELL MEMBRANE FATTY ACIDS AND CHARACTERIZATION OF THE PSYCHROTOLERANT SERRATIA MARCESCENS HI6 ISOLATED FROM HOPAR (BUALTAR) GLACIER, PAKISTAN