Search found 336 matches

by micro_pix
Mon Sep 14, 2020 9:57 am
Forum: Photography Through the Microscope
Topic: Euendolithic tunnels in flakes on the beach.
Replies: 30
Views: 4001

Re: Euendolithic tunnels in phyllosilicate on the beach.

iconoclastica wrote:
Mon Sep 14, 2020 9:46 am

I think is part of the skeleton of a sea-star, in Dorset probably Asterias rubens.

Wim
Thanks for that Wim, I just found another one, I don’t think I would have ever worked that out!

Dave
by micro_pix
Sat Sep 12, 2020 1:21 pm
Forum: Photography Through the Microscope
Topic: Euendolithic tunnels in flakes on the beach.
Replies: 30
Views: 4001

Re: Euendolithic tunnels in phyllosilicate on the beach.

I've already sent some samples off to a lab but I thought I'd try to see if I could detect any possible hyphal remains in these samples. Chitin, a constituent of the walls of fungal hyphae, fluoresces white under UV when stained with Calcofluor White. I have some Calcofluor White so I stained a samp...
by micro_pix
Sat Sep 12, 2020 12:58 am
Forum: Photography Through the Microscope
Topic: Euendolithic tunnels in flakes on the beach.
Replies: 30
Views: 4001

Re: Euendolithic tunnels in phyllosilicate on the beach.

The last photo was taken using a 100x NeoSPlan objective, and are “tunnels” in to a thin flake. The view is looking through the transparent flake so the tunnels are coming towards you from the far external plane. The flake is probably under 60 microns thick and the tunnels are under 5 microns wide. ...
by micro_pix
Sat Sep 12, 2020 12:13 am
Forum: Photography Through the Microscope
Topic: Hydrodictyon- waternet
Replies: 12
Views: 2030

Re: Hydrodictyon- waternet

Beautifully photographed!

Dave
by micro_pix
Fri Sep 11, 2020 6:15 am
Forum: Photography Through the Microscope
Topic: Euendolithic tunnels in flakes on the beach.
Replies: 30
Views: 4001

Re: Euendolithic bacteria tunnels in phyllosilicate on the beach.

Here are some more images. There are larger versions in a flickr album here https://flic.kr/s/aHsmQGjVkj . 10x Obj. Polarised mica_874.jpg 10x Obj. mica_bw.jpg 20x Obj. mica_redriuh.jpg 50x Obj. mica_95945.jpg 50x Obj. Stereo mica_stereo_55-Edit.jpg Suspiciously fungal looking. This is coming toward...
by micro_pix
Fri Sep 11, 2020 1:13 am
Forum: Photography Through the Microscope
Topic: Euendolithic tunnels in flakes on the beach.
Replies: 30
Views: 4001

Re: Euendolithic bacteria tunnels in phyllosilicate on the beach.

I have been contacted by a scientist I sent the photos to and he has said that they may have been produced by hyphal fungi rather than bacteria; I’m going to post a few flakes to him so that he can look at them on a micro CT scanner. Meanwhile I’m going to take some more photos.

Dave
by micro_pix
Fri Sep 11, 2020 12:32 am
Forum: Photography Through the Microscope
Topic: Euendolithic tunnels in flakes on the beach.
Replies: 30
Views: 4001

Re: Euendolithic bacteria tunnels in phyllosilicate on the beach.

Hi Lou,

the second photo is full frame with a 20x objective.

Dave
by micro_pix
Thu Sep 10, 2020 12:57 pm
Forum: Photography Through the Microscope
Topic: Euendolithic tunnels in flakes on the beach.
Replies: 30
Views: 4001

Re: Euendolithic bacteria tunnels in phyllosilicate on the beach.

Count me in with the "Beautiful photos!" I suppose it's a silly question, but has biological origin of the curved needle inclusions been ruled out? Knowing nothing about those cases, it's easy for me to imagine biological burrows getting re-filled with deposits of a different mineral. --Rik Thanks ...
by micro_pix
Thu Sep 10, 2020 12:41 pm
Forum: Photography Through the Microscope
Topic: Euendolithic tunnels in flakes on the beach.
Replies: 30
Views: 4001

Re: Euendolithic bacteria tunnels in phyllosilicate on the beach.

Thanks for the comments. Beautiful photos! That said I wouldn't discount these being inclusions of another mineral. I have seen this kind of shape in curved needle inclusions in other minerals. There has been a suggestion of bacterial etching in garnets before but it's been met with a lot of skeptic...
by micro_pix
Thu Sep 10, 2020 7:49 am
Forum: Photography Through the Microscope
Topic: Euendolithic tunnels in flakes on the beach.
Replies: 30
Views: 4001

Re: Euendolithic bacteria tunnels in phyllosilicate on the beach.

Hi Pau, I’d seen these bacteria tracks in ooids https://www.photomacrography.net/forum/viewtopic.php?f=14&t=36436&hilit=Oolite but they are calcium carbonate, as are the mollusc shells they also tunnel in to. Maybe they like the iron content of the mica but silicates are harder to dissolve than carb...
by micro_pix
Thu Sep 10, 2020 1:32 am
Forum: Photography Through the Microscope
Topic: Euendolithic tunnels in flakes on the beach.
Replies: 30
Views: 4001

Euendolithic tunnels in flakes on the beach.

I took a small sand sample from a beach in Dorset, UK the other day. It's mostly quartz grain sand and I was hoping to find some foraminifera, I did but I also found that there were lots of phyllosilicate (mica) flakes in the sample. The flakes were up to 3mm long and varied in thickness, they looke...
by micro_pix
Thu Aug 27, 2020 4:05 pm
Forum: Photography Through the Microscope
Topic: Hibiscus rosa-sinensis pollen
Replies: 12
Views: 1609

Re: Hibiscus rosa-sinensis pollen

Welcome!

Excellent detail and lighting.

Dave
by micro_pix
Sun Aug 16, 2020 1:24 pm
Forum: Photography Through the Microscope
Topic: Isoëtes echinospora
Replies: 2
Views: 928

Re: Isoëtes echinospora

Very nice set. I had no idea what I. echinospora was - it’s the Spiny-Spored Quillwort! Great name and interesting plant. I see it produces much smaller microspores too.

Dave
by micro_pix
Tue Aug 11, 2020 3:12 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Polypodium vulgare
Replies: 15
Views: 2305

Re: Polypodium vulgare

Excellent!

Dave