Out of these Microbes which ones can be seen with the naked eye, light...

[Ava]

...telescope and electron microscope.? Microbes:
-Water Molecule
-Cold Virus
-Retrovirus
-Thiomargarita
-Filovirus
-Cholera
-Yeast
-E.Coli

Out of these microbes which can be seen with:
A) Can be seen with the naked eye
B) Can be seen with light microscope
C) Can only be seen with electron microscope

[travwell]

A. "10,000 nanometers wide, which is the smallest dimension we can see with the naked eye" (http://www.discovernano.northwestern.edu/whatis/index_html/howsmall_html)

- Thiomargarita:
"Discovered in 1999, it is the largest bacterium ever discovered, with a width up to 750 ?m (0.75 mm) , making it easily visible to the naked eye." (http://en.wikipedia.org/wiki/Thiomargarita_namibiensis)
- Yeast:
"Yeast size can vary greatly depending on the species, typically measuring 3–4 µm in diameter, although some yeasts can reach over 40 µm." (http://en.wikipedia.org/wiki/Yeast)

B.
- Cholera:
some dude found it with his microscope, in an age before electron microscopes (http://www.ph.ucla.edu/EPI/snow/firstdiscoveredcholera.html)

C. "Believe it or not, waves of light are too large – visible light has a wavelength between 400 and 750 nanometers. That’s much larger than many nanoscale objects and definitely larger than most molecules. Instead the specialized microscopes use very small probes or electrons."
(http://www.discovernano.northwestern.edu/whatis/index_html/instruments_html)

- water molecule:
less than 100 pm (http://en.wikipedia.org/wiki/Water_(molecule))
- Filovirus:
"80nm" (http://en.wikipedia.org/wiki/Filovirus)
- Retrovirus
- Cold Virus
- E. coli:
"It is about 2 nanometers long and 1 nanometer wide. It is shaped like an oval." (http://redpoll.pharmacy.ualberta.ca/CCDB/cgi-bin/STAT_NEW.cgi)

[Suki Dee]

yeast - A
water molecule - This would not be visible even with an electron microscope. You would need the even better scanning force microscope to see things on the atomic scale. The best electron microscopes can only see something the size of a benzene molecule as a blur. A water molecule is just a fraction of the size of benzene. Both of these consist of just a few atoms, living organisms, even the simplest, consist of RNA, DNA, or Proteins and would have at least several thousand atoms.

[Suki Dee]

yeast - A
water molecule - This would not be visible even with an electron microscope. You would need the even better scanning force microscope to see things on the atomic scale. The best electron microscopes can only see something the size of a benzene molecule as a blur. A water molecule is just a fraction of the size of benzene. Both of these consist of just a few atoms, living organisms, even the simplest, consist of RNA, DNA, or Proteins and would have at least several thousand atoms.

[Space Monkey Mafia]

water a
cold b
retrovirus b
thiomar garita c
filovirus c
cholera b
yeast a
e coli c