Microbiology
The invisible world that controls our health, shapes our food, and keeps the planet alive.
🧫 Bacteria
Prokaryotic single-celled organisms. Most are harmless or beneficial. The human gut contains about 38 trillion bacteria. Pathogens like Staphylococcus and Mycobacterium tuberculosis cause disease. Bacteria are used in food production (yogurt, cheese) and biotechnology.
🦠 Viruses
Not technically alive, viruses are genetic material (DNA or RNA) in a protein coat. They hijack host cells to replicate. Examples: influenza, HIV, SARS-CoV-2. Vaccines train the immune system to recognize and neutralize specific viruses before infection.
🍄 Fungi
Eukaryotic organisms including yeasts, molds, and mushrooms. Penicillin (the first antibiotic) was derived from the mold Penicillium notatum in 1928. Fungi decompose organic matter and form mycorrhizal networks that help plants exchange nutrients.
💊 Antibiotics
Compounds that kill or inhibit bacteria. Different classes target different bacterial processes (cell wall synthesis, protein synthesis, DNA replication). Antibiotic resistance is a major global health threat caused by overuse and the natural evolution of bacteria.
🛡️ The Immune System
The innate immune system responds quickly and non-specifically. The adaptive immune system learns to recognize specific pathogens via T cells and B cells. B cells produce antibodies. Immunological memory is the basis of how vaccines work.
☢️ Radiation and Microbes
Deinococcus radiodurans is known as the world's most radiation-resistant organism and can survive doses 1,000x lethal to humans by rapidly repairing its DNA. Extremophile microbes have been found inside Chernobyl's reactor and thriving in the exclusion zone.