First, he applied a dye, called gentian violet, which penetrates both the protective wall and membrane of bacteria, thus staining the material inside. Then, he added the mineral iodine ...

_____ - For Gram-positive rods, perform a spore stain from the culture grown on the Nutrient Agar + MnCl 2 slant. (Endospore Stain Procedure) _____ For Gram-positive rods, flood the starch side of the ...

The half of the leaf under the silver foil remained the brown colour of the iodine stain. This is because no photosynthesis occurred, so no glucose was produced and none was stored as starch.

Iodine is an essential element - without which we would suffer severe developmental problems - and yet most of us have no idea how much we need, or where it comes from. In Their Element: Awesome ...