Search found 118 matches

by cuxlander
Fri Sep 22, 2017 5:45 pm
Forum: Pictures and Videos
Topic: Arcella dentata
Replies: 12
Views: 1596

Re: Arcella dentata

Hello Ronald, I only found them in one place, where 3 years ago they suddenly appeared in great numbers. There still are half a dozen in each petri-dish from recent water samples. This is a muddy ditch in a fen with birch and alder. Water and ground are slightly acidic (PH ~6), no real bog. Some sph...
by cuxlander
Fri Sep 22, 2017 9:10 am
Forum: Pictures and Videos
Topic: Arcella dentata
Replies: 12
Views: 1596

Re: Arcella dentata

Hello, and thanks for your kind comments. @Kurt and HKV: You know that most testacea-tests are quite fragile, and I hate to crush them! I therefore use concave slides, with cover glass. This often gives me the chance to rotate and turn my objects. In this case the (empty) shell was leaning on a bit ...
by cuxlander
Thu Sep 21, 2017 9:28 am
Forum: Pictures and Videos
Topic: Arcella dentata
Replies: 12
Views: 1596

Arcella dentata

Hello,

this is an Arcella dentata from an unusual angle - oblique dorsal, showing the crown shape:

Image

One must be lucky to get a side view of one of the discoid Arcella species'.

Stack of 40, 40x achro.

Greetings,
Hans
by cuxlander
Sun Sep 10, 2017 5:02 pm
Forum: Pictures and Videos
Topic: Amphora Diatom
Replies: 8
Views: 1560

Re: Amphora Diatom

Hello Actinophrys, You are of course right, my second specimen (the sideview) is definitely a Cymbella sp. Here is a drawing by Hustedt (1930), showing the typical shape of the cymbella-chloroplasts: http://www.hans-rothauscher.de/testaceen/forum/cymbella.jpg I am not too experienced as far as diato...
by cuxlander
Sun Sep 10, 2017 9:57 am
Forum: Pictures and Videos
Topic: Rotaria, amoeba, diatom
Replies: 13
Views: 1873

Re: Rotaria, amoeba, diatom

Hello Charles,
the rotifer and the diatom are splendid, I assume DIC?
Have you been able to identify the amoeba? The position makes identification difficult, could be a Lesquereusia??
Cheers,
Hans
by cuxlander
Sun Sep 10, 2017 9:47 am
Forum: Pictures and Videos
Topic: Amphora Diatom
Replies: 8
Views: 1560

Re: Amphora and Campylodiscus Diatoms

Hello, and thanks for your kind comments. @BillT: They were all on one slide. Books told me its the same species. But seebelow postings! @JohnB: Generally my equipment is not overgood with Diatoms (I'm specialising in testate amoebae). The fine structure of most silicon cells require better equipmen...
by cuxlander
Sat Sep 09, 2017 9:10 am
Forum: Pictures and Videos
Topic: Amphora Diatom
Replies: 8
Views: 1560

Amphora Diatom

Hello, I am showing a pretty Amphora cf. copulata: http://www.hans-rothauscher.de/testaceen/forum/Amphora%20ovalis_60.jpg Size 60 µm, 60x Achromat, transmitted light, stack of 3. I was wrong here, the sideview is of a cymbella, not an amphora: http://www.hans-rothauscher.de/testaceen/forum/Amphora_g...
by cuxlander
Sat Aug 19, 2017 5:07 pm
Forum: Pictures and Videos
Topic: Vampyrella Amoeba
Replies: 15
Views: 1855

Re: Vampyrella Amoeba

Thanks, Francisco,
Hans
by cuxlander
Fri Aug 18, 2017 8:03 pm
Forum: Pictures and Videos
Topic: Vampyrella Amoeba
Replies: 15
Views: 1855

Re: Vampyrella Amoeba

Hello Francisco, very interesting video. Have you seen this instructive video https://tib.flowcenter.de/mfc/medialink/3/dee0e4a5f8e060fa95560f2415839d17286c5948495580e61311f48899686ed0cb/VTS_01_1.mp4 by Norbert Hülsmann? Your specimen was probably about to penetrate a cell of the algae threat in ord...
by cuxlander
Fri Aug 18, 2017 10:19 am
Forum: Pictures and Videos
Topic: Crawling Difflugia
Replies: 8
Views: 1137

Re: Crawling Difflugia

Hello, and thanks for your kind comments. @75RR and @KurtM: The Zeiss KF2 (ex Junior) has a very basic condenser with single lever control. At a certain position of the lever and with a bit of juggeling you get an oblique light effect. It is a poor-mans-DIC, with some drawbacks of course. One is a s...
by cuxlander
Sun Aug 13, 2017 10:13 am
Forum: Pictures and Videos
Topic: Crawling Difflugia
Replies: 8
Views: 1137

Crawling Difflugia

Hello,
this is an snapshot of a very active 260 µm long Difflugia capreolata, filled with zoochlorella:

Image

(25x Zeiss Achromat, oblique-light, single focus)

Greetings,
Hans
by cuxlander
Sat Jul 01, 2017 4:35 pm
Forum: About the website, the magazine and this forum
Topic: mystery organism in pain
Replies: 2
Views: 5427

Re: mystery organism in pain

Hi Crusty,
I cannot see the photo,
Hans
by cuxlander
Fri Jun 23, 2017 5:44 pm
Forum: Pictures and Videos
Topic: Nebela and Euglypha
Replies: 4
Views: 1046

Nebela and Euglypha

Nebela tests are in general flat pyrishaped. They reinforce their test with shell plates robbed off Euglyphids and, like this specimen, also sometimes with Heliozoa Axopodia. http://www.hans-rothauscher.de/testaceen/forum/nebelascharf600.jpg Below are two examples of scale robberies: http://www.hans...
by cuxlander
Thu Mar 30, 2017 10:15 am
Forum: Introduce yourself
Topic: CMOS Microscope camera adapter
Replies: 2
Views: 1409

Re: CMOS Microscope camera adapter

Hello Istvan, ToupTec sell adapters for this kind of cameras with C-Mount adaption. They should fit your requirement. Types depend on sensor chip size. Manually focusable ones adjust for parfocality. Visit http://www.touptek.com/product/showproduct.php?lang=en&id=79. They look like this (photo from ...
by cuxlander
Wed Mar 29, 2017 12:51 pm
Forum: Pictures and Videos
Topic: Testate Amoeba
Replies: 10
Views: 1668

Re: Testate Amoeba

Hello btschumi, The third one is definitely Difflugia corona. The collar of the other two look more like Difflugia lithoplites. Ferry Siemensma writes in his arcella.nl : "not seldom together with Difflugia corona and Difflugia capreolata." How big were your specimen? Greetings, Hans PS Interesting,...
by cuxlander
Sat Mar 25, 2017 6:39 pm
Forum: Identification help
Topic: A testate amoeba?
Replies: 6
Views: 2515

Re: A testate amoeba?

Hello,
The lower one looks to me like a tardigrade egg.
See http://www.baertierchen.de/wb_okt00.html.
Regards,
Hans
by cuxlander
Sat Mar 11, 2017 1:03 pm
Forum: Pictures and Videos
Topic: Xanthidium antilopaeum
Replies: 2
Views: 679

Xanthidium antilopaeum

Hello Forum,

this is a 43 µm high (both semi cells without spines) Xanthidium cf. antilopaeum.

Image

Bright field 60x achro stack of 6. They prefer oligothrophic acid waters.

Regards,
Hans
by cuxlander
Thu Feb 02, 2017 10:00 am
Forum: Identification help
Topic: Two eggs in capsule?
Replies: 0
Views: 1241

Two eggs in capsule?

Hello Forum, this is obviously an egg capsule of some kind. http://www.hans-rothauscher.de/testaceen/forum/2eier.jpg The capsule is about 55 µm in diameter. This is a stack of a few focus layers, to show the spherical capsule with spines and the honeycomb surface of the eggs. (60x achro dry objectiv...
by cuxlander
Sun Jan 08, 2017 2:23 pm
Forum: Pictures and Videos
Topic: Arcella and algae
Replies: 2
Views: 499

Arcella and algae

Hello,
this is the bottom view of a nice empty Arcella presumably vulgaris, 95 µm.
Image
60x Achromat, Stack of 6 layers.
A few more focal planes would have improved overall sharpness.
Greetings,
Hans
by cuxlander
Thu Jan 05, 2017 11:39 am
Forum: Camera systems and imaging
Topic: How much touchup is "legal"?
Replies: 15
Views: 3263

Re: How much touchup is "legal"?

Hello btschumy,
there really is a lot of debris in your first image.
In your example I would prefer a cut-out enlargement of the main object and a moderate touch-up the background to emphazise the main motive.
To me your second image definitely received too much touch-up.
Greetings,
Hans
by cuxlander
Thu Dec 08, 2016 6:32 pm
Forum: Pictures and Videos
Topic: Arcella alive
Replies: 4
Views: 618

Re: Arcella alive

Thanks,
@Charlie: It is one focal plane. Details from other planes would spoil the image, if stacked.
@gekko: Yoour http://micritter.imgur.com/ does not work with me. If I click on a thumbnail it gives me a dark screen only, pity.
Hans
by cuxlander
Thu Dec 08, 2016 12:41 pm
Forum: Pictures and Videos
Topic: Arcella alive
Replies: 4
Views: 618

Arcella alive

Hello, I found this 104 µm wide Arcella cf. vulgaris today in sphagnum. After division new arcella-tests are hyaline. With age they get brownish and opaque, and you cannot look inside. This specimen is still sufficiently hyaline. http://www.hans-rothauscher.de/testaceen/forum/arcella.jpg The plasma ...
by cuxlander
Wed Dec 07, 2016 12:32 pm
Forum: Camera systems and imaging
Topic: focusable photo relay lens... anyone use these can give advice?
Replies: 21
Views: 4228

Re: focusable photo relay lens... anyone use these can give advice?

@bilben:
My camera on my trinocular is attached via something similar to this
http://www.ebay.com/itm/CANON-DSLR-SLR- ... 0770947923
I believe this is a combination of an adapter to the proprietary lens mount of a DSLR and a housing for an ocular. Without any optics, just tubes.
Hans
by cuxlander
Wed Dec 07, 2016 12:24 pm
Forum: Camera systems and imaging
Topic: focusable photo relay lens... anyone use these can give advice?
Replies: 21
Views: 4228

Re: focusable photo relay lens... anyone use these can give advice?

Hello, ToupTec make (or rebrand?) this type of adapters. See http://www.touptek.com/product/product.php?lang=en&class2=56 AMA for adjustable, FMA for fixed, followed by the magnification factor. They suggest: The possible maximum size for the image sensor is 18mmX0.37=6.66mm for the 0.37X camera ada...
by cuxlander
Mon Dec 05, 2016 5:49 pm
Forum: Pictures and Videos
Topic: Peridinium
Replies: 7
Views: 811

Re: Peridinium

Hello Hakan,
the second one is unmistakable.
Nice image.
Hans
by cuxlander
Sun Dec 04, 2016 9:06 am
Forum: Pictures and Videos
Topic: Testate amoebae ?
Replies: 8
Views: 889

Re: Testate amoebae ?

Hi 75RR,
definitely no Spumochlamys.
Could be a very deformed Arcella, one of the larger species (discoides, megastoma, artocrea). Only a guess.
Regards,
Hans
by cuxlander
Fri Dec 02, 2016 6:35 pm
Forum: Pictures and Videos
Topic: Testate amoeba Lesquereusia
Replies: 12
Views: 1224

Re: Testate amoeba Lesquereusia

Hi 75RR, If the sphagnum is floating or soaking wet you just squeeze it gently: http://www.hans-rothauscher.de/testaceen/forum/quetsch.jpg or if the sphagnum is very dense, use the lid of your sample bottle: http://www.hans-rothauscher.de/testaceen/forum/deckel.jpg Dry sphagnum soak in water, wait a...
by cuxlander
Fri Dec 02, 2016 6:30 pm
Forum: Pictures and Videos
Topic: Arcella
Replies: 10
Views: 1213

Re: Arcella

Hello 75RR, this is unusual, as Arcella never protect their test with foreign objects. The honeycomb as shown well in the DIC is the structure of a clean Arcella. There appears to be a lot of litter/debris on top. Thanks for the comparison, Oblique and DIC win. Unfortunately I can only do brightfiel...
by cuxlander
Thu Dec 01, 2016 6:25 pm
Forum: Pictures and Videos
Topic: Testate amoeba Lesquereusia
Replies: 12
Views: 1224

Re: Testate amoeba Lesquereusia

Hello, pleased that you like the image. @zzffn: Permanent mounts of testate amoebae are done by many people. You need of course a clean specimen. Wilfried Schoenborn writes (my translation) "preparation takes place on the slide. Isolate the specimen, rinse it in 70% alcohol to get rid of water. Moun...
by cuxlander
Thu Dec 01, 2016 11:27 am
Forum: Pictures and Videos
Topic: Testate amoeba Lesquereusia
Replies: 12
Views: 1224

Testate amoeba Lesquereusia

Hello, I would like to show you this interesting 144 µm high asymmetrically shaped Lesquereusia spiralis. The worm-like objects covering the surface are silicious rods produced by the organism (idiosomes). These are stored within the shell until it divides and passes them on to the new test. http://...