Search found 239 matches

by janvangastel
Sat Aug 08, 2020 2:12 pm
Forum: Sandbox
Topic: Colony of Vorticella
Replies: 6
Views: 61

Re: Colony of Vorticella

A very interesting and a very good quality video. I have never seen so many Vorticelli together. Is this DIC?
by janvangastel
Fri Aug 07, 2020 1:57 pm
Forum: Pictures and Videos
Topic: Paramecium caudatum?
Replies: 5
Views: 109

Re: Paramecium caudatum?

Thanks all for the detailed, informative comments and for the compliments. I have changed the title of the video and left out 'caudatum'. When I wrote down the length I already suspected that 'caudatum' would be wrong.
by janvangastel
Fri Aug 07, 2020 7:57 am
Forum: Pictures and Videos
Topic: Paramecium caudatum?
Replies: 5
Views: 109

Paramecium caudatum?

I think this is Paramecium caudatum, but I am not sure. The CV's of P. caudatum must have side channels and I do not see these in the ciliates I filmed. Best to look for it at the last part of the video,the oblique illumination part, that's also filmed at higher magnification and show more detail. A...
by janvangastel
Thu Aug 06, 2020 10:19 am
Forum: Pictures and Videos
Topic: Microscopic shellfish or...??
Replies: 10
Views: 132

Re: Microscopic shellfish or...??

Very nice video and very interesting. What is the largest magnification you used?
by janvangastel
Wed Aug 05, 2020 3:43 pm
Forum: Pictures and Videos
Topic: Desmid Pleurotaenium
Replies: 5
Views: 107

Re: Desmid Pleurotaenium

Very nice and sharp photographs!
by janvangastel
Wed Aug 05, 2020 12:22 pm
Forum: Pictures and Videos
Topic: Spiral shaped bacteriae
Replies: 5
Views: 102

Re: Spiral shaped bacteriae

Thanks for the comments. And micro, thanks for the effort to find the species name.
by janvangastel
Wed Aug 05, 2020 6:06 am
Forum: Pictures and Videos
Topic: larval forms of crustaceans
Replies: 7
Views: 147

Re: larval forms of crustaceans

Very nice, especially for a hand held photograph.
by janvangastel
Tue Aug 04, 2020 5:20 pm
Forum: Pictures and Videos
Topic: Spiral shaped bacteriae
Replies: 5
Views: 102

Spiral shaped bacteriae

The spiral shaped bacteriae in this video are ~1 micron in diameter or even less. I measured them to be ~0.75 microns, but it's easy to make a measurement error of a few tenth of a micron. Inside the bacteriae, volutin grains are sometimes clearly visible as black spots. I don't know the name of the...
by janvangastel
Tue Aug 04, 2020 4:29 pm
Forum: Illumination Techniques
Topic: Rheinberg illumination experiment
Replies: 6
Views: 163

Re: Rheinberg illumination experiment

Nice try Jan!. I wonder if the specimen would be clearer with a lighter background?. Steve Steve, I tried that, but then the blue color bleeds into the bolack background, reducing the contrast Does anyone know how this would look compared to regular darkfield, but with a blue filter placed between ...
by janvangastel
Mon Aug 03, 2020 3:57 pm
Forum: Pictures and Videos
Topic: Rotifer: Cephalodella, probably C. forficata
Replies: 0
Views: 50

Rotifer: Cephalodella, probably C. forficata

I found a rotifer today that I had not seen before. Well, I saw it before, but it always was to mobile to make a video. I think it is a Cephalodella, because of the general shape, the toes being larger then the other part of the foot and the bundle of stiff cilia around the mouth. Why do I think it ...
by janvangastel
Mon Aug 03, 2020 1:24 pm
Forum: Illumination Techniques
Topic: Rheinberg illumination experiment
Replies: 6
Views: 163

Rheinberg illumination experiment

Here's my first experiment with Rheinberg illumination: a rotifer. Maybe not the most suited object, but it's not too bad.

by janvangastel
Mon Aug 03, 2020 1:22 pm
Forum: Pictures and Videos
Topic: Tachysoma pellionellum
Replies: 4
Views: 123

Re: Tachysoma pellionellum

Thank you 75RR. I learn this approach mostly from Bruce's comments on my video. And yes, I am (was, I am retired) a scientist, but in a very different domain: psychology.
by janvangastel
Mon Aug 03, 2020 6:57 am
Forum: Pictures and Videos
Topic: Tachysoma pellionellum
Replies: 4
Views: 123

Re: Tachysoma pellionellum

Thanks Bruce. Nice that I have it right.
by janvangastel
Sun Aug 02, 2020 8:39 am
Forum: Pictures and Videos
Topic: Tachysoma pellionellum
Replies: 4
Views: 123

Tachysoma pellionellum

I found it very difficult to ID this ciliate and I may be wrong of course. The easiest part of ID-ing this ciliate was finding out that it is a hypotrich. But there are many hypotrichs. The one I observed is a slender one, which has al least two macro nucleii. Maybe four, because it looks like the t...
by janvangastel
Sat Aug 01, 2020 5:58 pm
Forum: Pictures and Videos
Topic: Paramecia Sparkling Under Polarized Light
Replies: 3
Views: 108

Re: Paramecia Sparkling Under Polarized Light

Nice video.
I did the same a couple of days ago, but the result was quit different: https://www.youtube.com/watch?v=F2CIS9DedJ4
by janvangastel
Sat Aug 01, 2020 10:19 am
Forum: Pictures and Videos
Topic: Litonotus cygnus
Replies: 3
Views: 85

Re: Litonotus cygnus

Thanks again Bruce. Are toxicysts really toxic? If yes, what then is their function? Are they used when hunting?
by janvangastel
Sat Aug 01, 2020 10:15 am
Forum: Pictures and Videos
Topic: Lacrymaria olor?
Replies: 2
Views: 81

Lacrymaria olor?

I think I found Lacrymaria olor. In pictures and video's I found a much longer neck in relation to the body most of the time, but this ciliate was not all of the other 'long neck' ciliates I considered. FOV of the video is 0.32x0.17 millimeters. The body of the ciliate without neck and head is about...
by janvangastel
Fri Jul 31, 2020 8:57 pm
Forum: Pictures and Videos
Topic: Litonotus cygnus
Replies: 3
Views: 85

Litonotus cygnus

I am pretty sure this is Litonotus cygnus.

by janvangastel
Fri Jul 31, 2020 6:31 am
Forum: Pictures and Videos
Topic: Stichotrichia?
Replies: 3
Views: 83

Re: Stichotrichia?

Thanks for the comments and compliments. I am glad that I had it right. I try to use Bruce's systematic approach when ID-ing and learn a lot.
by janvangastel
Thu Jul 30, 2020 4:05 pm
Forum: Pictures and Videos
Topic: Stichotrichia?
Replies: 3
Views: 83

Stichotrichia?

Looks like Stichotricha aculeata, but (as usual) I am not sure. As far as I can see it has no lorica from where it operates, but It does seem to retreat into some kind of 'hole' from time to time. Length of this ciliate is about 106 microns.

by janvangastel
Thu Jul 30, 2020 2:53 pm
Forum: Illumination Techniques
Topic: Not enough light for Rheinberg filters
Replies: 7
Views: 154

Re: Not enough light for Rheinberg filters

No, the center disk in well centered and not too big.
by janvangastel
Thu Jul 30, 2020 9:16 am
Forum: Illumination Techniques
Topic: Not enough light for Rheinberg filters
Replies: 7
Views: 154

Re: Not enough light for Rheinberg filters

I just did a quick experiment and cut a round piece of the right size from a red sheet of thin plastic. I used it with a dark filter on top of it, to block the block the light of the background field and it worked very well: the background stayed black and the specimen became nicely red. So I suppos...
by janvangastel
Thu Jul 30, 2020 8:59 am
Forum: Illumination Techniques
Topic: Not enough light for Rheinberg filters
Replies: 7
Views: 154

Re: Not enough light for Rheinberg filters

Are you sure you have set up your microscope correctly and use all the available power? Yes, I am sure, I tried at least 10 times, with different colors and different objectives/magnifcations. Black field is no problem, but when I try Rheinberg the whole field becomes black. Or, when I don't close ...
by janvangastel
Thu Jul 30, 2020 6:04 am
Forum: Illumination Techniques
Topic: Not enough light for Rheinberg filters
Replies: 7
Views: 154

Not enough light for Rheinberg filters

I have bought Rheinberg filters from ebay. Problem is, that the image stays dark because there's not enough light going through the filters. I use a 50W halogen lamp in my orthoplan. I could use a 100W lamp, but that will create too much heat I think, because even with 50W I can feel that the filter...
by janvangastel
Thu Jul 30, 2020 5:57 am
Forum: Pictures and Videos
Topic: Linotus?
Replies: 2
Views: 90

Re: Linotus?

Thanks again Bruce. I learn a lot from your comments.
by janvangastel
Wed Jul 29, 2020 11:04 am
Forum: My microscope
Topic: Olympus BH-2 BHS
Replies: 10
Views: 341

Re: Olympus BH-2 BHS

Seems like they did a very thourough cleaning and maintainance job.
by janvangastel
Wed Jul 29, 2020 8:12 am
Forum: Pictures and Videos
Topic: Linotus?
Replies: 2
Views: 90

Linotus?

I found a new ciliate (well, new to me). I think it is a Linotus. It looks like Linotus lamella, but then the macro nuclei are out of place. They should be below each other instead of next to each other.

by janvangastel
Tue Jul 28, 2020 9:45 am
Forum: Pictures and Videos
Topic: Melosira nummuloides
Replies: 11
Views: 203

Re: Melosira nummuloides

Very nice photograph!
Is this brownisch color it's normal, live color?
by janvangastel
Mon Jul 27, 2020 6:02 pm
Forum: Pictures and Videos
Topic: Oxytricha chlorellichera
Replies: 2
Views: 105

Re: Oxytricha chlorelligera

Thank you Bruce. I adapted the name to 'Hypotrich with symbiotic algae, probably Oxytricha chlorelligera'.
by janvangastel
Mon Jul 27, 2020 11:40 am
Forum: Sandbox
Topic: Darkfield and Reinberg filters
Replies: 7
Views: 170

Re: Darkfield and Reinberg filters

Nice filters and a nice effect.