Cosmarium, large Desmid

Images made through a microscope. All subject types.

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NikonUser
Posts: 2676
Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

Cosmarium, large Desmid

Post by NikonUser »

Cosmarium: a single-celled placoderm desmid alga (Desmidiaceae); nucleus in the narrow isthmus.
This specimen is football-shaped (US not UK).

left image is a 31 frame stack through the middle part of the organism and shows the beautifully shaped chloroplasts.

right image is a 10 frame stack of just below the surface to show 2 masses of little round bodies that were in constant motion. These show as dark spots in left image.

Oly 40x S Plan Apo, 2.5 NFK photoeyepiece; 1µ frames; ZS P Max
Image
NUM10042
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives

Charles Krebs
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Joined: Tue Aug 01, 2006 8:02 pm
Location: Issaquah, WA USA
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Post by Charles Krebs »

to show 2 masses of little round bodies that were in constant motion
These are crystals of barium sulfate or calcium sulfate, and they move about by "Brownian motion". Their function is uncertain, but some think they function as a statolith, allowing a "sense" of gravity.... up/down.

I think you are having way too much fun with your new microscope! :wink: :wink:

NikonUser
Posts: 2676
Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

Post by NikonUser »

Thanks Charles, all the desmids seem to have them.

Yes, lots of fun. So nice to see things I have never seen before; and I don't have to travel to far off places :lol:

Hopefully can start work on some protozoans and those fast-moving diatoms (fast at 100-200x).
Just waiting for some bottles of Protoslo to arrive.
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives

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