Sierra College Department of Biological Sciences

Sierra College Biological Sciences'
Microscopic Slide Collection and Associated Images


Gram stain


Photomicrograph of a Gram stain showing Gram positive cocci (blue/purple) and Gram negative rods (red). Magnification: 1000x.

A photomicrograph of a Gram stain preparation showing two types of bacteria magnified 1000x. In this preparation, the Gram positive cocci, Staphylococcus aureus, appear as dark purple sphears and the Gram negative bacilli, Serratia marcescens, appear as pink or red-colored rods.


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