Cell Theory Timeline Cell Theory 1 All living

Cell Theory Timeline

Cell Theory 1. All living things are made of cells. 2. Cells are the basic units of life. 3. Living cells only come from other living cells.

Aristotle • 334 B. C. E. • Aristotle observed nature directly. • He classified all known organisms as either plants or animals. • B. C. E. = Before Common Era

It all started with… • The first microscope! – Zacharias and Hans Jansen – 1595 – Middleburg, Holland – Placed two lenses in a tube

Hans & Zacharias Janssen • 1595 • Hans & Zacharias Janssen produced the first compound microscope by lining up 2 lenses.

Robert Hooke • 1665 • Robert Hooke observed lining matter (cork cells) through a compound microscope, which reveals empty cells. • He is the first to call the spaces in the cork “cells” which means little rooms.

Anton van Leeuwenhoek • 1675 • Anton van Leeuwenhoek observed living bacteria and blood cells through a simple microscope.

Matthias Schleiden • 1838 • Matthias Schleiden discovered that plants were made of cells. • He believed plant growth happened through the production of new cells

Theodor Schwann • 1839 • Theodor Schwann states “all animals are made of cells. ” • Believed plant and animal cells were different in structure, but the cell was the basic unit for life.

William Henry Perkin • 1856 • William Henry Perkin develops an intense purple dye, which is used to stain slides.

Rudolph Virchow • 1858 • Rudolph Virchow states… – “Cells are the last link in a great chain that forms tissues, organs, systems, and individuals. Where a cell exists, there must have been a preexisting cell. ” • Cells can only arise from preexisting cells • He also stated that diseases caused changes in a normal cell