Algae respond to light.

cepheidlux · Post by **cepheidlux** » Sat Jun 22, 2013 12:41 pm

http://www.youtube.com/watch?v=VQvTaYYH-lM
Planktosphaeria dark field

kriscavok · Post by **kriscavok** » Sun Jun 23, 2013 5:27 am

Hi,
This is very interesting and well shown. Is that time lapse or just normal frame rate?
Regards!

emsiem · Post by **emsiem** » Sun Jun 23, 2013 8:04 am

Love it!

cepheidlux · Post by **cepheidlux** » Sun Jun 23, 2013 8:04 am

kriscavok wrote:Hi,
This is very interesting and well shown. Is that time lapse or just normal frame rate?
Regards!

Thanks, It was recorded by phone so the frame rate is normal

Pau · Post by **Pau** » Sun Jun 23, 2013 11:50 am

Very very nice!

How did you manage to get the light spot in a darkfield?

cepheidlux · Post by **cepheidlux** » Mon Jun 24, 2013 3:06 am

I used oil dark field condenser from PZO. I placed the condenser at the correct height. Then I closed the field iris. As a result I got a well-lit spot. The height of the condenser is most important.

RogelioMoreno · Post by **RogelioMoreno** » Mon Jun 24, 2013 3:19 am

Very nice video!

Rogelio

Gerd · Post by **Gerd** » Fri Jun 28, 2013 2:01 pm

Wow,
nicely captured video !
I never have seen any algae with such a fast response to light !
Can you please tell us more about the algal cells, you have seen and
captured for this video.
I do not agree in your identification as Planktospaeria.
I know Planktospaeria from soil habitats, they have some mucilage sheath,
only the small zoospores are motile.
Do you have any other pictures or videos of the algal cells.
What was the habitat, where you found them, freshwater or marine ?
Thank you for further informations,
regards,
Gerd

cepheidlux · Post by **cepheidlux** » Wed Jul 03, 2013 7:49 am

Gerd wrote:Wow,
nicely captured video !
I never have seen any algae with such a fast response to light !
Can you please tell us more about the algal cells, you have seen and
captured for this video.
I do not agree in your identification as Planktospaeria.
I know Planktospaeria from soil habitats, they have some mucilage sheath,
only the small zoospores are motile.
Do you have any other pictures or videos of the algal cells.
What was the habitat, where you found them, freshwater or marine ?
Thank you for further informations,
regards,
Gerd

Thanks for your interest. In these films, I also noticed the algae. https://www.youtube.com/watch?v=5VIM6cO07OM
https://www.youtube.com/watch?v=6Q7SAgPRhbs

These are definitely the same algae. They have a slightly different shape when they don't move. I found them in freshwater. It was a small river. They were in my samples as long as the temperature does not fall below about 20 degrees Celsius.

cepheidlux · Post by **cepheidlux** » Wed Jul 03, 2013 7:51 am

Ob. Nikon E Plan 40/0.65
I can not say anything more about these algae.