Share Animal Pictures: For Animal Lovers

[BillTre]

 

[BillTre]

Opps. Left out the caption. Its a fossil crinoid. Like an upside-down star fish (sea star) on a stem.

 

[berkeman]

Opps. Left out the caption. Its a fossil crinoid. Like an upside-down star fish (sea star) on a stem.

Looks like the movie Alien...

 

[BillTre]

Tartigrade:

 

[symbolipoint]

BillTre,
Was that microscopic fancy-lit picture organism photographed using some digital type software, or was using photographic film?

 

[BillTre]

They probably used a digital video camera mounted on a microscope with the fancy contrast optics (like phase contrast).

 

[Andy Resnick]

They probably used a digital video camera mounted on a microscope with the fancy contrast optics (like phase contrast).

The optics aren't that complicated- just imaging through crossed polarizers. The way colors are generated is a little tricky, but basically result from what is left when a narrowband portion of of the illumination spectrum is rejected (because of the 'retardance' of the material). The poster used a basic petrographic setup, you can get similar rainbow colors from hair/bone/teeth, anything birefringent with a vaguely crystalline structure.

 

[DaveE]

polychromatic polarizing microscopy is a bit more complex than conventional polarization microscopy (the one with crossed polarizers and a waveplate). In PPM, instead of a simple polarizer in front of the illumination they construct a different polarization state for each wavelength for the illumination. At least that's how I think it works, I'm certainly no expert. You can read about it in this patent.

https://patentimages.storage.googleapis.com/13/76/77/be4559922a6c31/US9625369.pdf

 

[BillTre]

 

[Swamp Thing]

Rather long, but well worth watching.

 

[BillTre]

Rather long, but well worth watching.

Pretty amazing, but somehow appropriate for someone going by Swamp Thing.

 

[DennisN]

I just heard that a new cat species has been discovered in Bolivia:

The tilcayo (Leopardus tilcayo) is a species of small wild cat in the genus Leopardus. It is native to Bolivia, and represents the first cat species named since 1923.

It's a gorgeous animal, two photos:

Source: Tilcayo tiger cat (Wikipedia)

Two articles:

• See the first new species of cat discovered in more than a century—it’s adorable (Scientific American)
• New species of wild cat discovered in Bolivia’s cloud forest (BBC Wildlife)

 

[BillTre]

Using different filter sets lets the labeling of different parts be shown in the different combinations.

 

[BillTre]

Two headed diamond back terrapin hatchling found in Cape Cod.

 

[BillTre]

 

[BillTre]

 

[renormalize]

(Image removed)

Huh???
This image is explicitly labeled "AI content" and ZeroGPT gives the response:

So what's the point of posting it?

 

[berkeman]

This image is explicitly labeled "AI content" and ZeroGPT gives the response:

Thanks @renormalize I thought it was pretty unbelievable, but that's why I "Like"ed it.

 

[BillTre]

Huh???
This image is explicitly labeled "AI content" and ZeroGPT gives the response:
View attachment 374563
So what's the point of posting it?

Guess I missed that.

 

[Andy Resnick]

polychromatic polarizing microscopy is a bit more complex than conventional polarization microscopy (the one with crossed polarizers and a waveplate). In PPM, instead of a simple polarizer in front of the illumination they construct a different polarization state for each wavelength for the illumination. At least that's how I think it works, I'm certainly no expert. You can read about it in this patent.

https://patentimages.storage.googleapis.com/13/76/77/be4559922a6c31/US9625369.pdf

Just saw your reply, this is a little more interesting. If I understand the patent description correctly, what I need is a wavelength-dependent polarization ellipse azimuthal angle 'θ'. My magic book ("Ellipsometry and Polarized Light, Azzam and Bashara) has some information on how to do this; I think all I need is a 'bad' (large longitudinal chromatic aberration) retarder. I'll have to check this out!