Lecture 2 Germ theory and microorganisms

Cell Theory

All organisms are composed to one or more cells

The cells come from preexisting cells

structure and organization in organisms

Spontaneous generation

hypothesis that life arises form a nonliving matter “vital force”

Biogenesis

cells arise only from preexisting living cells

Microbial Growth

Nutrient broth heated, the placed in covered (not sealed) flask

Ridofl Birchew

Stated living cells arise from preexisting cells

Louis Pasteur

demonstrated that microorganisms are present in the air

Fermentation

microbial conversion of sugar to alcohol in the absence of air

Pastuerization

high heat for a short time to kill bacteria

Agasito Bassi

showed a silkworm is a disease by a fungus

Pasteur

showed a silkworm is a disease by a protozoon

Joeseph Lister

Used a chemical antiseptic

Robert Hoch

bacterial causes anthrax and postulates

Koch’s Prostulates

relationship between a microbe and a disease

Immunity

protection