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Ex. 4: Gram Stain

Ex. 4: Gram Stain

Ex. 4: Gram Stain. Chromophores Basic vs. acidic dyes. Primary stain (stains all cells on slide) Decolorizing step (removes stain from certain types of cells) Counterstain (stains the decolorized cells). Differential Stain. Strongly advised:.

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785 views • 20 slides
The ability of an organism to move by itself is called motility.

The ability of an organism to move by itself is called motility.

Bacterial Motility . The ability of an organism to move by itself is called motility. Motility is closely linked with chemotaxis, the ability to orientate along certain chemical gradients. A large number of bacteria are motile.

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864 views • 17 slides
Analytical Profile Index API 20E

Analytical Profile Index API 20E

Analytical Profile Index API 20E. API 20E system. The API 20E is a standardized identification system for Enterobacteriaceae and other non-fastidious, Gram negative rods.

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1.1k views • 15 slides
Biochemical tests / Api (20) E system

Biochemical tests / Api (20) E system

Dr. Suhad Faisal Hatem. Biochemical tests / Api (20) E system.

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194 views • 10 slides
In-vitro antibacterial activity of tomato glycosides

In-vitro antibacterial activity of tomato glycosides

Glycosides were extracted from green tomatoes with ethanol as the solvent. The extracted glycosides were purified by an HPD macroporous resin and a silica gel column, crystallised and then recrystallised to yield white powder. The minimal inhibitory concentration (MIC) of the extracted tomato glycosides against Escherichia coli was determined to be 3.54 mg/mL through agar diffusion test. The effects of pH, temperature and reaction time on the anti-bacterial activity of the tomato glycosides were investigated. The bacteriostatic effect of the tomato glycosides was stronger than that of 1.5% sodium benzoate. The tomato glycosides exhibited the strongest anti-bacterial effect at pH 7.

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105 views • 6 slides

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