Search found 105 matches

by cuxlander
Tue Apr 17, 2018 8:42 am
Forum: Pictures and Videos
Topic: Poor man's SEM
Replies: 10
Views: 933

Re: Poor man's SEM

Thanks for your comments. The collection and subsequent use of xenosomes, i.e. foreign materials for the reenforcement of testacea shells has frequently raised the question: May this already be called behaviour? Many members of the Hyalospheniidae build their shells using recycled shell plates scave...
by cuxlander
Mon Apr 16, 2018 4:36 pm
Forum: Pictures and Videos
Topic: Poor man's SEM
Replies: 10
Views: 933

Poor man's SEM

Hello, ths is the 169 µm high testate amoeba Planocarina (former Nebela) marginata obliquely illuminated: http://www.hans-rothauscher.de/testaceen/forum/marginata.jpg The shell is covered with scales which had been robbed from Euglypha and other foreign objects. 40x Neofluar, Stacked image, contrast...
by cuxlander
Tue Mar 06, 2018 5:43 pm
Forum: Pictures and Videos
Topic: Some Forams from Indian Ocean
Replies: 7
Views: 893

Re: Some Forams from Indian Ocean

Hello RR,
My wife collected them from Mombasa beach. The ones I measured were between 250 and 400 µm.
Greetings,
Hans
by cuxlander
Tue Mar 06, 2018 12:02 pm
Forum: Pictures and Videos
Topic: Some Forams from Indian Ocean
Replies: 7
Views: 893

Some Forams from Indian Ocean

Hello, here are some Foraminifers from Mombasa Beach, Kenia: http://www.hans-rothauscher.de/testaceen/forum/foram11.jpg http://www.hans-rothauscher.de/testaceen/forum/foram12.jpg http://www.hans-rothauscher.de/testaceen/forum/foram6.jpg http://www.hans-rothauscher.de/testaceen/forum/foram9.jpg Speci...
by cuxlander
Thu Feb 08, 2018 8:01 am
Forum: Pictures and Videos
Topic: Copepod, Amoeba and Algae
Replies: 14
Views: 1069

Re: Copepod, Amoeba and Algae

Sorry Kurt for wrong spelling.

Even the word hyalinity, I fear, does not exist and is my own word creation.

When Arcella cells are young, their shells are are colorless and hyaline, i.e. translucent, older ones become brown and intransparent.

Sorry for confusion.

Hans
by cuxlander
Tue Feb 06, 2018 12:28 pm
Forum: Pictures and Videos
Topic: Copepod, Amoeba and Algae
Replies: 14
Views: 1069

Re: Copepod, Amoeba and Algae

Hello Hakan, they are all great. I like the Arcella best. I believe its a young Arcella gibbosa, when they grow older they partly loose their hyalanity. The blob bottom left of the sarcode is a contractile vacuole. By osmotic pressure the organism constantly absorbs water. The vacuole pumps excessiv...
by cuxlander
Mon Nov 27, 2017 12:14 pm
Forum: Pictures and Videos
Topic: Arcella mitrata
Replies: 2
Views: 442

Arcella mitrata

Hello,
this is an insight into a 120 µm wide alive Arcella mitrata:
Image
One focal plane. 60x achromat.
Cheers,
Hans
by cuxlander
Mon Nov 06, 2017 12:51 pm
Forum: Pictures and Videos
Topic: Ceratium, Tachysoma & Uroglenopsis
Replies: 14
Views: 1482

Re: Ceratium, Tachysoma & Uroglena

Hi HKV,
I like best the first Ceratium.
Hans
by cuxlander
Sun Nov 05, 2017 1:01 pm
Forum: Camera systems and imaging
Topic: Tethered shooting
Replies: 5
Views: 2077

Re: Tethered shooting

Hello John B, yes, a lot of very useful information for me to start with, thanks. At present I use a Toupcam-cmos-camera with the adapter FMR 050 and the great Toupview software which came with it. Here is my present tool, and I do not want to miss the pretty Zeiss KF2, and I very much like the conv...
by cuxlander
Sat Nov 04, 2017 8:18 pm
Forum: Camera systems and imaging
Topic: Tethered shooting
Replies: 5
Views: 2077

Tethered shooting

Hello,

Which cameras, DSLR or compact (micro four-third?), can be controlled via the laptop, i. e. tethered shooting? Until now I only found high end Olympus like the E-M1 and the E-M5 Mark II.

Thanks,
Hans
by cuxlander
Sun Oct 29, 2017 2:32 pm
Forum: Pictures and Videos
Topic: Surface structure of Arcella
Replies: 7
Views: 821

Re: Surface structure of Arcella

Thanks Jim,

No DIC, basic brightfield using achromats.

Greetings,
Hans
by cuxlander
Sun Oct 29, 2017 9:03 am
Forum: Pictures and Videos
Topic: Surface structure of Arcella
Replies: 7
Views: 821

Surface structure of Arcella

Hello,

this image shows the honeycomb structure of the shell of a live Arcella cf. vulgaris, 102 µm dia, dorsal view.
Stack of 25, 60x dry Achromat:

Image

Cheers,
Hans
by cuxlander
Fri Oct 13, 2017 11:06 am
Forum: Identification help
Topic: is this a diatom ?
Replies: 4
Views: 1429

Re: is this a diatom ?

Hello Mr. Micro,
it is a testate amoeba, definitely a Centropyxis species most probably C. aculeata.
Cheers,
Hans


See https://arcella.nl/centropyxis-aculeata
(edit this link added)
by cuxlander
Sat Oct 07, 2017 5:29 pm
Forum: Pictures and Videos
Topic: "Nacimiento" de un nuevo Arcella
Replies: 14
Views: 1985

Re: "Nacimiento" de un nuevo Arcella

Hi Francisco,
Thanks, interesting! How the plasma moves to and fro between the two shells, until both have an equal share and composition of plasma and food particles.
Hans
by cuxlander
Sat Oct 07, 2017 6:44 am
Forum: Pictures and Videos
Topic: The rare Arcella formosa
Replies: 8
Views: 1203

Re: The rare Arcella formosa

Thanks Jim,
these were two individuals on same slide. A matter of good luck.
Greetings, Hans
by cuxlander
Mon Oct 02, 2017 10:25 am
Forum: Pictures and Videos
Topic: The rare Arcella formosa
Replies: 8
Views: 1203

The rare Arcella formosa

Hello, this is the rare Arcella formosa ( about 200 µm wide). It has so far only been found in a few locations in Canada, Netherlands, Hungary, Germany (Mecklenburg) and this year by me in a nearby fen: http://www.hans-rothauscher.de/testaceen/forum/formosa8.jpg (dorsal) http://www.hans-rothauscher....
by cuxlander
Mon Oct 02, 2017 9:23 am
Forum: Pictures and Videos
Topic: Bacillaria paxillifer.
Replies: 6
Views: 1013

Re: Bacillaria paxillifer.

Hello Francisco,
Very interesting, only saw them once.
Was this in fresh water?
Hans
by cuxlander
Fri Sep 22, 2017 5:45 pm
Forum: Pictures and Videos
Topic: Arcella dentata
Replies: 12
Views: 1223

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: 1223

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: 1223

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: 1267

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: 1400

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: 1267

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: 1267

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: 1502

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: 1502

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: 936

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: 936

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: 3513

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: 888

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...