Introducing Bacteria

Basic information about bacteria, their structure, classification, and role in nature. Articles explain bacterial cells, identification methods, evolutionary significance, and disease-causing varieties like Klebsiella.

Bacteria and Evolution

How simple bacteria shaped the evolution of complex life on Earth through photosynthesis and environmental adaptation.

How and When Were Bacteria Discovered?

A Dutch cloth merchant accidentally discovered bacteria in pond water during the 1660s while grinding magnifying lenses for examining cloth.

How Many Types of Bacteria Are There?

Earth holds trillions of bacteria divided into just two main groups and seven distinct types based on their shape and cell walls.

Identification of Bacteria

Bacteria are identified using microscopy and staining techniques to determine their shape and cell wall structure in lab cultures.

Using Microscopes to See Bacteria

Microscopes reveal bacteria that are invisible to the naked eye, from basic light microscopes to powerful electron microscopes.

What Are Bacteria?

Single-celled bacteria live everywhere on Earth, from your body to extreme environments, and can be helpful or deadly.

What Health Conditions Do Klebsiella Bacteria Cause?

Klebsiella bacteria normally live in your gut harmlessly, but can cause serious infections in people with weakened immune systems, particularly lung disease.

What Is Inside a Bacterial Cell?

Bacterial cells have a rigid cell wall, protective capsule, and structures like pili and flagella that help them survive and move.

Where Do Bacteria Live?

Bacteria thrive almost everywhere on Earth, from Arctic permafrost to deep-sea vents, soil and inside human bodies.