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cell theory 1

all organisms are made of one or more cells

cell theory 2

the cell is the basic unit of organization in organism

cell theory 3

all cells come from cells


made the first microscope

brightfield microscope

light microscope, image viewed against bright background; most often used to study cells; up to 2,000x

darkfield microscope

image bright against dark background; up to 2,000x; details more visible than brightfield

Hooke microscope

up to 250x; historic, handheld, clear images of "beasties"

Flourescence microscope

up to 1,500x; specimen must be treated with special flourescent stain; certain cell structures and substances glow

Transmission electron microscope

aims a beam of electrons through specimen; up to 1,000,000x

Phase-contrast microscope

emphasizes differences in specimen's capacity to bend light waves; good for viewing living cells; up to 1,500x

Scanning electron microscope

sweeps beam of electrons over specimen causing other electrons to be emitted; realistic 3-D image; 200,000x

Zacharriar Janssen

first to look through a compound microscope

Antonie van Leeuwenhoek

made simple microscope with glass bead

Robert Hooke

saw box like things in cork called them cells

Matthias Schleider

said that all plants are made of cells

Theodor Schwann

said all animal cells are made of cells

Rudolph Virchow

said all cells come from a cell that existed before

the virus attaches to a specific host cell

virus #1

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