Search found 19 matches

by Oliver Skibbe
Mon Sep 05, 2005 4:59 am
Forum: General Discussion Forum and Community Announcements
Topic: Challenges, contests and competitions...
Replies: 6
Views: 8937

Update

Last week I received an invitation to submit some images to the Olympus Bioscapes Contest. I took the opportunity to ask the organizer, Michael W. Davidson, what the passage "each potential winner must complete, sign and return certain prize release forms, including, but not limited to, an affidavit...
by Oliver Skibbe
Sun Aug 28, 2005 8:48 pm
Forum: General Discussion Forum and Community Announcements
Topic: Challenges, contests and competitions...
Replies: 6
Views: 8937

Hi Mike, I fear that participants of such contests often have to learn the hard way. Websites rarely give you all the information you need. Just imagine that months after sending in your work to a competition you actually receive an e-mail notification, telling you that you are a winner. The organiz...
by Oliver Skibbe
Sun Aug 28, 2005 7:47 pm
Forum: General Discussion Forum and Community Announcements
Topic: Challenges, contests and competitions...
Replies: 6
Views: 8937

Beware!

Hello! I hate to sound like a party-pooper, but I'd like to point out that at least some of these competitions are just badly disguised attempts to exploit naive amateurs and scientists. One example: winners of the Nikon Small World Competion are required to sign an affidavit saying "In consideratio...
by Oliver Skibbe
Mon Aug 22, 2005 4:17 am
Forum: Photography Through the Microscope Gallery
Topic: Euplotes
Replies: 10
Views: 9238

Hello, Wim!
I concur that your photo looks like a Stylonychia, but I'm really no expert for hypotrichs/stichotrichs.
If you really want to learn something about this group you should visit Peter Eigner's page http://members.nextra.at/p.eigner
by Oliver Skibbe
Sun Aug 21, 2005 2:59 pm
Forum: Photography Through the Microscope Gallery
Topic: Euplotes
Replies: 10
Views: 9238

That's correct, Wim. The main obstacle for scientists trying to resolve the phylogenetic relationship between organisms is to differentiate between homologies and analogies. In case of hypotrich and stichotrich ciliates there are some arguments (AFAIK both genetic and ultrastructural) that might out...
by Oliver Skibbe
Sun Aug 21, 2005 1:03 am
Forum: Photography Through the Microscope Gallery
Topic: Frontonia buccal area (for Oliver, Wim and Ron)
Replies: 11
Views: 7954

Perfect! The bold trichocysts that are located between the somal kineties (surrounding the oral region) are clearly distinguishable from the delicate ciliature of the oral membranelles.
by Oliver Skibbe
Sun Aug 21, 2005 12:15 am
Forum: Photography Through the Microscope Gallery
Topic: Frontonia – cilia
Replies: 6
Views: 5524

The rod-like structures you can see in the cortex of Paramecium, Frontonia and related ciliates (a group scientifically called Peniculida) are trichocysts and mucocysts. Trichocysts are made of protein and can be ejected when the ciliate is injured or shocked. This is a very dramatic reaction, becau...
by Oliver Skibbe
Sat Aug 20, 2005 9:10 am
Forum: Photography Through the Microscope Gallery
Topic: Euplotes
Replies: 10
Views: 9238

Hello, Wim! The orientation of the AZM should be the same in all "Hypotrichs", though taxonomy has changed in a very confusing way. The classic group of hypotrich ciliates does not exist anymore. Today most of the former Hypotrichs are called "Stichotrichia". They remain in the class "Spirotrichea",...
by Oliver Skibbe
Sat Aug 20, 2005 7:35 am
Forum: Photography Through the Microscope Gallery
Topic: tiny rotifer without a name
Replies: 4
Views: 4272

Good point, Wim!
On the other hand I have no idea what rotifer testicles look like... 8)
Anyway, here' a link to an illustrated rotifer database, that might help you to determine that little critter:
http://data.acnatsci.org/biodiversity_d ... php/browse
by Oliver Skibbe
Sat Aug 20, 2005 7:23 am
Forum: Photography Through the Microscope Gallery
Topic: Frontonia
Replies: 6
Views: 5007

:lol: :lol: :lol:
by Oliver Skibbe
Fri Aug 19, 2005 1:57 am
Forum: Photography Through the Microscope Gallery
Topic: tiny rotifer without a name
Replies: 4
Views: 4272

Hi, Wim! Sorry, I can't help you with the identification. But I think, you might have caught a male individual. Most of the rotifers that you see are females. They reproduce by parthenogenesis. But from time to time male dwarf rotifers appear and sexual reproduction occurs, often followed by the pro...
by Oliver Skibbe
Fri Aug 19, 2005 12:54 am
Forum: Photography Through the Microscope Gallery
Topic: Euplotes
Replies: 10
Views: 9238

Actually this is no Euplotes but Uronychia, a closely related genus of the Euplotidae. ;-)
by Oliver Skibbe
Fri Aug 19, 2005 12:38 am
Forum: Photography Through the Microscope Gallery
Topic: Frontonia
Replies: 6
Views: 5007

Hi, Wim!
This is without a doubt a Frontontonia, but one of the smaller species. Probably Frontonia depressa.
Nice photo!
by Oliver Skibbe
Wed May 25, 2005 10:29 pm
Forum: Macro and Close-up Photography Gallery
Topic: What are theese tiny creatures?
Replies: 15
Views: 10516

It is probably a Sminthurides sp., a primitive wingless insect belonging to springtails (Apterygota, Collembola).
by Oliver Skibbe
Tue May 24, 2005 8:00 am
Forum: Photography Through the Microscope Gallery
Topic: cymbella
Replies: 12
Views: 8760

Hi ya' Oliver :!: :D What a wonderful video clip :!: I like to shoot videos, too, but I use a converted webcam for mine. I'm struck by the quality of your video. What equipment do you use to make these clips :?: :D (Don't mean to take over your topic, Wim :wink: :D ) Best regards, :D Thank you, Tom...