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All About Cells. Microscopes and the Cell Theory. Microscopes of Today. At lot of times, when we think of a object, we think of it as it is today. For example, a cell phone. Cell Phones. So when we think of cell phones, we think of the ones we see today.

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Microscopes and the cell theory

All About Cells

Microscopes and the Cell Theory


Microscopes of today
Microscopes of Today

At lot of times, when we think of a object, we think of it as it is today.

For example, a cell phone.


Cell phones
Cell Phones

So when we think of cell phones, we think of the ones we see today.

The ones that we know and many of us use.

But what about the original cell phones?


Microscopes
Microscopes

Just as there are difference between the cell phones we use now and the original cell phones, there are also differences in the microscopes we use today and what the original scientists who first looked at cells had available to them.








Microscopes and the cell theory

Historical microscope images, and more, can be found at: http://www.techinst.com/antiquecollection.html


Microscopes and the cell theory


The discovery of the cell
The Discovery of the Cell develop the current understanding of the cell.

  • Early Scientists

    • Robert Hooke (1665)

    • Observed a cork slick and saw that it seemed to be made up of tiny, empty chambers.

    • Hooke called these chambers cells, because they resembled the tiny rooms of a monastery.


The discovery of the cell1
The Discovery of the Cell develop the current understanding of the cell.

  • Early Scientists

    • Anton van Leeuwenhoek (1674)

    • Used a single-lense microscope to observe pond water

    • Saw tiny living organisms, which he called “animalcules” and we know today as bacteria




Microscopes and the cell theory


The cell theory
The Cell Theory preexisting cells, completing the cell theory

  • Cells are the basic unit of life.

  • The cell theory states that:

    • All living things are composed of cells

    • Cells are basic units of structure and function in living things

    • New cells are produced from existing cells


The cell theory1
The Cell Theory preexisting cells, completing the cell theory

  • Remember, before the Cell Theory, we had Spontaneous Generation – that life can arise from nonliving matter.

  • The scientists who worked to disprove this idea are:

    • Redi

    • Spallanzani

    • Pasteur


Redi s experiment
Redi’s preexisting cells, completing the cell theory Experiment


Spallanzani s experiment
Spallanzani’s preexisting cells, completing the cell theoryExperiment


Pasteur s experiment
Pasteur’s Experiment preexisting cells, completing the cell theory


Exploring the cell
Exploring the Cell preexisting cells, completing the cell theory

  • Common Microscope Types:

    • Light microscope – living organisms, but low resolution

    • Electron microscopes - view details 1000 times smaller than visible in light microscopes. Non-living specimens. Requires vacuum.

    • Scanning Probe microscopes – Can operate in air, and can show DNA, protein molecules, and even single atoms.


Microscopes and the cell theory


Microscopes and the cell theory

  • Electron Microscopes preexisting cells, completing the cell theory

    • Transmission Electron microscopes – requires thin specimens, can view cell structures and large protein molecules.


Microscopes and the cell theory

  • Electron microscopes preexisting cells, completing the cell theory

    • Scanning Electron microscopes – 3D


Microscopes and the cell theory


Prokaryote cells
Prokaryote Cells preexisting cells, completing the cell theory


Eukaryotes cells
Eukaryotes Cells preexisting cells, completing the cell theory