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what is the results for serratia marcescens when doing a TSI SLANT. i want to know...

what is the results for serratia marcescens when doing a TSI SLANT.

i want to know if the TSI results are alakline or acidic

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Answer #1

TSI results for Serratia marcescens will be acidic.

Due to utilization of glucose, the slant will become yellow and due to utilization of sucrose, butt will become yellow. This yellow color will be formed because S.marcescens will produce acids by utilization of glucose and sucrose. Phenol red dye present in the medium turns yellow in acidic pH. There will be no black color formation in medium because S.marcescens cannot produce H2S.

Results : yellow slant and butt

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