in Dental Plaque! (Ewwww!) –
1683
Until
the late 1600s, nobody knew that there were tiny, invisible creatures
living among (and in!) us. But on this date in 1683, Antony Van
Leeuwenhoek wrote a letter to Britain's Royal Society describing tiny
one-celled creatures he discovered while looking through a
microscope.
He
called these creatures “animalcules,” but today we call them
bacteria.
Microscopes
had been invented almost a century earlier, and even compound
microscopes (those that combine ocular and objective lenses) had been
created by Van Leeuwenhoek's time. However, the early compound
microscopes were not able to get clear images at more than twenty or
thirty times magnification. Van Leeuwenhoek was able to look at much
smaller things using the simple microscopes he himself made—the
best in the world, for the time—achieving magnifications above 200
times!
And
what did he study using his powerful microscope? Plaque scraped from
his own teeth and from the teeth of four other people.
Van
Leeuwenhoek was surprised to see living creatures “very prettily
a-moving.” Some shot through the plaque-and-water mixture, straight
and swift, and others “spun round like a top.”
Van
Leeuwenhoek later discovered foraminifera fossils, blood cells,
animal sperm cells, and vacuoles in cells. (These are like storage
bins inside cells. They contain water and important molecules.)
With
all of this discovery, you are probably not surprised that Van
Leeuwenhoek is considered the “Father of Microbiology.”
Learn
more...
Biology4Kids
has a website about microorganisms.
Microbe World has tons of links to explore, and Science Kids offers videos of microscopic activity.
To
learn about other founders of microbiology, check out this and this other earlier posts. (Both posts include other topics not related to
microbiology. Just scan down to the picture of the microscope!) There
are also activities such as a fun virtual microscope.
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