Search found 147 matches
- Sun Apr 14, 2024 10:56 am
- Forum: Home-made microscope adaptations
- Topic: Searching Cree LED for tiny dimmers
- Replies: 23
- Views: 20109
Re: Searching Cree LED for tiny dimmers
Hello, I use a similiar mini-dimmer since 5 years, using a Cree XM-L U2 SMD-LED, 280lm, 6000K, CRI 80, (I don't know if still available) My dimmer is shown below. It has a separate on/off/dimmer-switch, to be safe I have included a 3Ohm resistor. The whole setup fits neatly inside the base of my lit...
- Sat Mar 16, 2024 10:40 am
- Forum: Pictures and Videos
- Topic: Euglenid posing as a hermit crab?
- Replies: 7
- Views: 541
Re: Euglenid posing as a hermit crab?
Hello again,
here's another one.
The bottom one seems to take a breath of fresh oxygen through Hyalosphenia papilio's pore.
Cheers Hans
here's another one.
The bottom one seems to take a breath of fresh oxygen through Hyalosphenia papilio's pore.
Cheers Hans
- Fri Mar 15, 2024 3:06 pm
- Forum: Pictures and Videos
- Topic: Euglenid posing as a hermit crab?
- Replies: 7
- Views: 541
Re: Euglenid posing as a hermit crab?
Hello,
Call it deliberate or else. Lynn Margulis refers to the protist cell as the “conscious cell”.
It makes sense for a photosynthetic singleceller to search shelter inside an empty hyaline housing. And they obviously are quite determined as my few examples show:
Cheers
Hans,
Call it deliberate or else. Lynn Margulis refers to the protist cell as the “conscious cell”.
It makes sense for a photosynthetic singleceller to search shelter inside an empty hyaline housing. And they obviously are quite determined as my few examples show:
Cheers
Hans,
- Sun Feb 18, 2024 2:53 pm
- Forum: Pictures and Videos
- Topic: Arcella conjugation?
- Replies: 7
- Views: 666
Re: Arcella conjugation?
Hello Harry, These are Netzelia tuberculata . I have elaborated 2 frames from your video. The left image shows the epipodia, with which the body is attached to the shell(left ) and the shape of the shell with depressions (the right one on the left image). If the two blobs in the right hand one are n...
- Fri Feb 16, 2024 1:19 pm
- Forum: Pictures and Videos
- Topic: Arcella conjugation?
- Replies: 7
- Views: 666
Re: Arcella conjugation?
Hello,
Interesting, looks like a division of Arcella hemisphaerica or Antarcella atava. Both around 50 µm wide.
Cheers,
Hans
Interesting, looks like a division of Arcella hemisphaerica or Antarcella atava. Both around 50 µm wide.
Cheers,
Hans
- Tue Oct 24, 2023 12:17 pm
- Forum: Articles and images to be published
- Topic: Hyalosphenia papilio variant
- Replies: 0
- Views: 4620
Hyalosphenia papilio variant
Hello, Hyalosphenia papilio as we know it: papilio_114.jpg In 2007, Chaim Glück described a variation of Hyalosphenia papilio in which the shell is heavily dented below the pores. During his studies this variation proliferated and became dominant in his examined area. In 2022 I found the same variat...
- Sun Sep 18, 2022 10:55 am
- Forum: Pictures and Videos
- Topic: Testate Matryoshka
- Replies: 2
- Views: 592
Testate Matryoshka
Hello, Euglypha acantophora is the only known testate amoeba forming this double cyst: acantophora_schief.jpg acantophora3.jpg The inner cyst is typically spherical. However, this is surrounded by an egg-shaped outer cyst. This is covered by the reserve scales which the animal has produced for the n...
- Tue Jun 07, 2022 8:03 am
- Forum: Identification help
- Topic: which Ciliate?
- Replies: 1
- Views: 751
which Ciliate?
Hello Forum,
I found several of these creatures in sphagnum. About 90 µm dia. Slowly rotating. Many active contractile vacuoles. In transmiztted light only vaguely visible cilia.
Thanks,
Hans
I found several of these creatures in sphagnum. About 90 µm dia. Slowly rotating. Many active contractile vacuoles. In transmiztted light only vaguely visible cilia.
Thanks,
Hans
- Sun May 29, 2022 1:23 pm
- Forum: Pictures and Videos
- Topic: Shelled Amoeba - Arcellinida
- Replies: 5
- Views: 1128
Re: Shelled Amoeba - Arcellinida
Hello Bob,
problem with the video is the filetype MTS which the browser cannot render. I downloaded the videofile and was able to open it with Windows' Media Player, very lively and interesting video.
Hans
problem with the video is the filetype MTS which the browser cannot render. I downloaded the videofile and was able to open it with Windows' Media Player, very lively and interesting video.
Hans
- Sun May 29, 2022 9:06 am
- Forum: Pictures and Videos
- Topic: Shelled Amoeba - Arcellinida
- Replies: 5
- Views: 1128
Re: Shelled Amoeba - Arcellinida
Hello,
I cannot open the video. from the still: it is a Lesquereusia species.
Cheers,
Hans
I cannot open the video. from the still: it is a Lesquereusia species.
Cheers,
Hans
- Sat Nov 20, 2021 10:00 am
- Forum: Pictures and Videos
- Topic: Which Rotifer?
- Replies: 0
- Views: 748
Which Rotifer?
Hello, I could not identify this rotifer. Noticeable is the funnel-like head with apparently only one corona. The photos were not ideal, I tried to piece together three individual photos in a reasonably sensible way. There's a video here: https://youtu.be/D-9wVHFF_6o Length approx. 250 µm Thanks, Hans
- Wed Jul 21, 2021 10:26 am
- Forum: Identification help
- Topic: Strange sea creature!
- Replies: 2
- Views: 2465
Re: Strange sea creature!
Hello Brutha,
maybe a leech.
Greetings,
Hans
maybe a leech.
Greetings,
Hans
- Mon May 10, 2021 9:15 am
- Forum: Miscellaneous
- Topic: Visually Handicapped Microscope User
- Replies: 7
- Views: 2816
Re: Visually Handicapped Microscope User
Hi, My right eye has very low vision, the left one is OK. So I have problems similar to yours. I have found and purchased this mono/photo eyepiece, which fits on all of the old Zeiss Standards: http://www.hans-rothauscher.de/testaceen/forum/junior.jpg edit: If the image does not show, here is anothe...
- Sun Feb 07, 2021 2:48 pm
- Forum: Pictures and Videos
- Topic: Netzelia corona - a pretty testate amoeba
- Replies: 6
- Views: 2839
Re: Netzelia corona - a pretty testate amoeba
Hello, glad you like the photos. @sdani the shell was empty and the pseudostom and some of the spines a bit damaged. For this kind of thick globular objects I use slides with concave depression. Items don't crush so easily and sometimes you are able to turn them. The photos are stacks of about 20 fr...
- Fri Feb 05, 2021 10:06 am
- Forum: Pictures and Videos
- Topic: Return to the Biofilm
- Replies: 2
- Views: 1319
Re: Return to the Biofilm
Hello Don,
your voice in your videos is always quite faint. The volume of the music is OK. Interesting active rotifers.
Cheers,
Hans
your voice in your videos is always quite faint. The volume of the music is OK. Interesting active rotifers.
Cheers,
Hans
- Thu Feb 04, 2021 1:01 pm
- Forum: Pictures and Videos
- Topic: Netzelia corona - a pretty testate amoeba
- Replies: 6
- Views: 2839
Netzelia corona - a pretty testate amoeba
Hello,
Yesterday I found this Netzelia corona (former Difflugia corona), size 195 µm. Joseph Leidy considered it "the most remarkable and beautiful species of the genus" .
Here are two aspects:
(40x Neofluar)
Cheers,
Hans
Yesterday I found this Netzelia corona (former Difflugia corona), size 195 µm. Joseph Leidy considered it "the most remarkable and beautiful species of the genus" .
Here are two aspects:
(40x Neofluar)
Cheers,
Hans
- Wed Dec 16, 2020 2:23 pm
- Forum: Beginner's corner
- Topic: Stacked pictures come out Cartoonish
- Replies: 15
- Views: 6426
Re: Stacked pictures come out Cartoonish
Hello plasmid,
Rgds,
Hans
I feel that the single source image already shows sharp edges.one of the pics used ...
Rgds,
Hans
- Thu Nov 19, 2020 2:46 pm
- Forum: Identification help
- Topic: Too big to be a Heliozoa right?
- Replies: 1
- Views: 1717
Re: Too big to be a Heliozoa right?
How big??
cheers, Hans
cheers, Hans
- Mon Nov 09, 2020 9:59 am
- Forum: Pictures and Videos
- Topic: Lost in space?
- Replies: 4
- Views: 2399
Re: Lost in space?
@Hans I like Joseph Leidys drawings. The green balls in these drawings and in my photo are symbiont algae. You find the same algae in Hyalosphenia, some Difflugia, the green Hydra etc. They can survive without their hosts, the hosts howwever cannot do without their symbiont algae. Greetings, the oth...
- Sun Nov 08, 2020 5:59 pm
- Forum: Pictures and Videos
- Topic: Lost in space?
- Replies: 4
- Views: 2399
Lost in space?
Hello, Countless planets in endless space? http://www.hans-rothauscher.de/testaceen/forum/weltraum.jpg No, a look inside Heleopera sphagni http://www.hans-rothauscher.de/testaceen/forum/sphagni2.jpg Encysted specimen, symbiont algae around large transparent nucleus. Stack, 100x Achromat enjoy, Hans
- Tue Sep 08, 2020 10:32 am
- Forum: Pictures and Videos
- Topic: Arcella discoides
- Replies: 6
- Views: 3255
Re: Arcella discoides
Hi,
thanks for all your kind comments.
Hans
thanks for all your kind comments.
Hans
- Sat Sep 05, 2020 7:13 pm
- Forum: Pictures and Videos
- Topic: Arcella discoides
- Replies: 6
- Views: 3255
Arcella discoides
discoides1.jpg discoides2.jpg Hello Forists, I just bought me a Zeiss Plan-Neofluar 63/125 Oil and would like to show two of my first oil-immersion-photos: 1. Arcella discoides 122 µm one focal plane: 2. Arcella discoides 133 µm stack of two (discoides are nicely flat) focal planes, showing 9 of 10...
- Sun Jul 05, 2020 10:07 am
- Forum: Pictures and Videos
- Topic: Horsefly portrait
- Replies: 5
- Views: 2367
Re: Horsefly portrait
Hello Bob,
Cheerrs,
Hans
please tell us about this adapter.microscope adapter
Cheerrs,
Hans
- Sun Jul 05, 2020 10:04 am
- Forum: Identification help
- Topic: Amoeba or Ciliate?
- Replies: 0
- Views: 1327
Amoeba or Ciliate?
Hello Forum,
What is this ?
Abt 110 µm big, not moving, digesting.
Cheers,
Hans
What is this ?
Abt 110 µm big, not moving, digesting.
Cheers,
Hans
- Sat Jun 27, 2020 6:23 pm
- Forum: Pictures and Videos
- Topic: Inside Centropyxis
- Replies: 5
- Views: 3288
Re: Inside Centropyxis
Hello, thanks for your comments. Views which SEMs cannot provide. Here's another example: http://hans-rothauscher.de/testaceen/pics/Pontigulasia%20elisa_94.jpg http://hans-rothauscher.de/testaceen/pics/pontigulasia_bruecke.jpg . Pontigulasia (= throat bridge) build internal bridges to prevent Rotife...
- Tue Jun 23, 2020 5:42 pm
- Forum: Pictures and Videos
- Topic: Inside Centropyxis
- Replies: 5
- Views: 3288
Inside Centropyxis
Hello Forum, usually you observe disc shaped testate amoebae like Arcella or Centropyxis sitting flat on your glass slide, like this Centropyxis discoides : http://hans-rothauscher.de/testaceen/pics/discoides2.png With some luck and glycerol I have been able to view the following two specimen from ...
- Mon Jun 15, 2020 5:39 pm
- Forum: Pictures and Videos
- Topic: Campylodiscus (hibernicus?)
- Replies: 7
- Views: 3424
Re: Campylodiscus (hibernicus?)
Moin Bob, the Kreidesee (Chalk-Lake) is a rather deep and very clear lake in the Cuxhaven area. It is a sport-divers hotspot. Yes it is recent and I also frequently find live specimen. Their contents regularly obscures stacks. http://hans-rothauscher.de/testaceen/forum/campylo5.jpg Like with other d...
- Mon Jun 15, 2020 9:25 am
- Forum: Pictures and Videos
- Topic: Campylodiscus (hibernicus?)
- Replies: 7
- Views: 3424
Re: Campylodiscus (hibernicus?)
Hi, thanks for your comments! @ KurtM and 75RR: I am using concave slides. Turning specimens is, like 75RR described the method, "hit and miss". I touch the cover glass with a needle and/or slightly move it aside. Not much of a miracle. @Bob: I found them occasionally in the mud of the Kreidesee Hem...
- Sun Jun 14, 2020 7:32 pm
- Forum: Pictures and Videos
- Topic: Campylodiscus (hibernicus?)
- Replies: 7
- Views: 3424
Campylodiscus (hibernicus?)
Hello forum, this empty Campylodiscus reluctantly permitted me to turn it into various positions: http://www.hans-rothauscher.de/testaceen/forum/campylo1.png http://www.hans-rothauscher.de/testaceen/forum/campylo2.png http://www.hans-rothauscher.de/testaceen/forum/campylo3.png http://www.hans-rothau...
- Sun May 10, 2020 5:09 pm
- Forum: Camera systems and imaging
- Topic: PWM and banding
- Replies: 3
- Views: 2540
PWM and banding
Hello,
I am using a makeshift LED with PWM dimming. Frequently I experienced strong banding.
Then I forgot to remove a POL-foil from the in-base illuminator. No more banding.
Does this make sense?
Cheers,
Hans
I am using a makeshift LED with PWM dimming. Frequently I experienced strong banding.
Then I forgot to remove a POL-foil from the in-base illuminator. No more banding.
Does this make sense?
Cheers,
Hans