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What are Bacteria?

Bacteria are microscopic organisms whose single cells have neither a membrane-bounded nucleus nor other membrane-bounded organelles like mitochondria and chloroplasts. 

Properties of Bacteria

The Gram stain is named after the 19th century Danish bacteriologist who developed it. Although the Gram stain might seem an arbitrary criterion to use in bacterial taxonomy, it does, in fact, distinguish between two fundamentally different kinds of bacterial cell walls and reflects a natural division among the bacteria.


    Gram Negative Stain - Red or pinkish

    Gram Positive Stain + Blue or violet

 - - -

    Gram Stain Samples - click this line

    Why does it stain this way?

The color differences are sometimes subtle so learn to recognize the differences!

Gram Stain
Gram stain Introduction
Gram-staining Procedure
Gram Stain Tutorial
Gram Stain
Bite Sized tutorials, the gram stain
Gram Stain Index
Cell Differentiation by Gram's Stain
MedlinePlus Medical Encyclopedia: Endocervical Gram stain


Famous scientist quote:
"The sciences gain by mutual support.  When, as the result of my first communications on the fermentations in 1857-1858, it appeared that the ferments, properly so-called, are living beings, that the germs of microscopic organisms abound in the surface of all objects, in th air and in water; that the theory of spontaneous generation is chimerical; ..." Louis Pasteur (1822 - 1895)  developed a method of inoculation of cattle for anthrax proving the efficacy of vaccinations.

Screened bacteria links to other web sites.

Bacteria Can Help Fruit Growers
Bacterial Growth
Bacterial Nomenclature
Bacterial Structure Table of Contents
Bad Bug Book
Domain Archaea
E. coli Genome Project
Gram Staining
Journal of Bacteriology
Microbionet: Bacteriology
Myxobacteria Web Page
Prokaryotic Diversity Web Site
The Rise of Antibiotic-Resistant Infections
Scientists Isolate Unusual Bacterium with Appetite for Pollutants
The Archaebacteria
The Mycobacteria
Welcome to the NNFF Home Page
World's Toughest Bacterium Has a Taste for Waste


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