Phacus

pwnell · Post by **pwnell** » Sat May 23, 2015 10:14 am

Phacus by Waldo Nell, on Flickr
Phacus (Carolina),100x*1.25,POL

Phacus by Waldo Nell, on Flickr
Phacus (Carolina),100x*1.25,DIC, HF B

Phacus and flagella by Waldo Nell, on Flickr
Phacus (Carolina),100x*1.25,DIC, HF A

vasselle · Post by **vasselle** » Sat May 23, 2015 10:47 am

Hello.
Very nice
Cordialement seb

Charles Krebs · Post by **Charles Krebs** » Sat May 23, 2015 12:53 pm

Waldo,

All three are great!

Olympusman · Post by **Olympusman** » Sat May 23, 2015 2:00 pm

Geez, Waldo, these are amazing! So they appear to be cross polarized which suggests that some of the bodies in these Phaci are crystaline.

Mike

piermicro · Post by **piermicro** » Sun May 24, 2015 1:34 am

Very, very nice. All great.

Jacek · Post by **Jacek** » Sun May 24, 2015 1:35 am

Super, I like these little ones

ralfwagner · Post by **ralfwagner** » Sun May 24, 2015 1:48 am

Incredible.

carlos.uruguay · Post by **carlos.uruguay** » Sun May 24, 2015 8:26 am

Awesome

pwnell · Post by **pwnell** » Sun May 24, 2015 9:07 am

Olympusman wrote:Geez, Waldo, these are amazing! So they appear to be cross polarized which suggests that some of the bodies in these Phaci are crystaline.

Mike

Thanks. Yup - I think those are the starch bundles, right?

pwnell · Post by **pwnell** » Sun May 24, 2015 9:07 am

Thanks for the kind words!

Pau · Post by **Pau** » Sun May 24, 2015 10:31 am

Olympusman wrote: So they appear to be cross polarized which suggests that some of the bodies in these Phaci are crystaline.

They are called paramylon grains or bodies, paramylon is a polysaccaride different but close to starch, and is more crystalline than true starch.
http://www.jstor.org/stable/2443868?seq ... b_contents

Not exactly crystaline but starch grains consists in (mostly) linear mollecules highly organized in concentric layers, so it's also birrefringent.
An easy and nice observation of the same phenomenon can be done with a bit of the liquid obtained when cutting a potato under cross pol or DIC

Waldo, they are super pictures as usual in your work

discomorphella · Post by **discomorphella** » Sun May 24, 2015 2:59 pm

Utterly beautiful demonstration of the birefringent starch storage bodies, and superb pictures overall.

David

Marek Mis · Post by **Marek Mis** » Sun May 24, 2015 11:03 pm

Very nice, especially the first and last one !

Marek

Ecki · Post by **Ecki** » Mon May 25, 2015 11:58 am

Beautiful

arturoag75 · Post by **arturoag75** » Tue May 26, 2015 1:22 am

Beautiful

Phacus

Phacus

Phacus

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Re: Phacus