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Research history and cell discovery.

Watch the video for the lesson

https://www.youtube.com/watch?v=4OpBylwH9DU

NEW WORDS


Английский

Русский

Cell

Клетка

Research

Исследовать

Discovery

Открытие

Microscopes

Микроскоп

Magnification

Увеличение

cell theory

Клеточная теория

Living

Живой

plant cells

Растительная клетка

Investigation

Изучение

Experiment

Эксперимент

Romans

Romans

When Romans discovered they were able to make glass in the 1st century BC, things changed for the better!

Anton Van Leeuwenhoek

He figured how to grind glass together and decided to experiment. Leeuwenhoek made his own 270x magnification compound microscope!

Today, microscopes magnifications range from 200x-10,000,000x magnification.

What is a

Theory?

A set of principles developed over time via multiple investigations.

The discovery of the cell was made through the invention of the microscope between 1665-1838.


How it all started 

Cell Theory

There are 3 major parts of the cell theory:

  • All organisms are made of cells.
  • All existing cells are produced by other living cells.
  • The cell is the most basic unit of life.

There are 5 contributors to the cell theory:

There are 5 contributors to the cell theory:

  • Robert Hooke
  • Anton van Leeuwenhoek
  • Matthias Schleiden
  • Theodor Schwann
  • Rudolf Virchow
  • Each of the above contributors produced evidence through investigations and experiments that led to today’s cell theory!

Bell-Ringer !

1. The cell theory is composed of how many parts?

2. How many contributors help compile today’s cell theory?


© Copyright 2015 – All rights reserved. www.cpalms.org

Robert Hooke

English Scientist

  • Used the compound microscope to observe cork.
  • Hooke observed that cork is composed of small, hollow compartments.
  • The parts prompted Hooke to think of small rooms (cells) in a monastery, so he gave them the same name: CELLS.
  • Investigated cork through experimenting with the compound microscope and came up with the name cells!
  • Key Note: Hooke discovered the cell in 1665, which started formulating the cell theory!

Hooke’s Investigation/experiment

Hooke’s Observations

Hooke’s Microscope

Anton van Leeuwenhoek

Dutch Tradesman

  • Study new approaches for creating lenses to observe cloth.
  • Leeuwenhoek’s microscope was more powerful than Hooke’s compound microscope.
  • From investigating and experimenting with his microscope, Leeuwenhoek became one of the first scientists to refer to living cells when he observed an abundant number of single-celled organisms, which he called animalcules (plant & animal), swimming in a drop of pond water!

Leeuwenhoek’s investigations/experiment

Leeuwenhoek’s Observations

Leeuwenhoek’s Microscope


© Copyright 2015 – All rights reserved. www.cpalms.org

Matthias schleiden

German Scientist

  • Fascinated with plant cells, Schleiden used the compound microscope and studied plant cells.
  • From investigating and experimenting with plants, projected plant parts are made of cells!
  • Discussed what he observed with his dear friend, German scientist Theodor Schwann.

Theodor Schwann

German Scientist

  • Studied plant & animal cells, and was intrigued by the similarities between the two.
  • From investigating and experimenting with plant & animal cells, Schwann was able to determine that all animals are made of cells!
  • Schwann published the 1st statement of the cell theory: all living things are made of cells and cell products!

Rudolf Virchow

  • Based on his investigations and experiments, he stated that all cells come from preexisting cells, which is the 2nd part of the cell theory: all existing cells are produced by other living cells!

Key Note: After Virchow’s completed his
work, the cell theory was finally formulated in 1838!
© Copyright 2015 – All rights reserved. www.cpalms.org

Recap

Cell Theory

There are 3 major parts of the cell theory:

  • All organisms are made of cells.
  • All existing cells are produced by other living cells.
  • The cell is the most basic unit of life.
  • These three parts were discovered between 1665-1838.

Contributors

There are 5 contributors to the cell theory:

  • Robert Hooke
  • Anton van Leeuwenhoek
  • Matthias Schleiden
  • Theodor Schwann
  • Rudolf Virchow

Eye-Catchers

Robert Hooke

  • came up with the name cells
  • Anton Van Leeuwenhoek

  • referred to living cells called animalcules (plant & animal) after observing a drop of pond water
  • Matthias Schleiden

  • projected plant cells are made of cells
  • Theodor Schwann

  • determined all animals are made of cells (1st statement of the cell theory)
  • Rudolf Virchow

  • stated all cells come from preexisting cells (2nd statement of the cell theory)

Key Note: It took over 173 years for the
cell THEORY to be formulated, wow!

1. Name the 3 major parts of the cell theory.

2. Name the 5 contributors of the cell theory.



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