Search found 971 matches

by hkv
Wed Dec 30, 2020 9:24 am
Forum: Digital processing
Topic: How to take measurements of things under the microscope?
Replies: 11
Views: 481

Re: How to take measurements of things under the microscope?

My method is similar to what has been proposed above. Steps as follows. For each objective, 4X, 10X, 20X, etc: 1. Take a photograph of a stage micrometer and make sure you measure the width of the full circle of the field of view 2. Bring the image into an image viewer where you can count the number...
by hkv
Sun Dec 20, 2020 10:48 pm
Forum: Pictures and Videos
Topic: Tardigrade
Replies: 5
Views: 684

Re: Tardigrade

Lovely images and creatures! I have been collecting samples for years and have never found one. Not even once. I need to figure out how to get hold of these beauties.
by hkv
Sun Dec 20, 2020 9:00 pm
Forum: Pictures and Videos
Topic: Algal blooms and their guards
Replies: 6
Views: 336

Re: Algal blooms and their guards

Wow! Extremely good images Håkan Thanks! All are fantastic, and my favorite winner is the green Closterium with two Stephanodiscus sattelites near the tow ends, on a dark blue background.. Interesting that you say that, because others have said the same. Personally I find it interesting to compare ...
by hkv
Sun Dec 20, 2020 6:31 pm
Forum: Pictures and Videos
Topic: Algal blooms and their guards
Replies: 6
Views: 336

Algal blooms and their guards

This fall I made a small contribution to a research project at Lunds University in Sweden. It was another member of this forum that introduced me to the project (Viktor J Nilsson). A big thank you for that Victor! The project was about keeping track of harmful alga blooms. Residents around Vombjsön ...
by hkv
Thu Oct 22, 2020 7:57 pm
Forum: Pictures and Videos
Topic: Algal bloom under the microscope
Replies: 19
Views: 1551

Re: Algal bloom under the microscope

Thank you very much Viktor for connecting me with Dr. Rengefors! Really appreciate it! She will indeed help me to get MWC and Z8 (I think it was called). This will allow me to keep my babies alive! I will study the paper you are referring to. Very interesting topic.
by hkv
Thu Oct 08, 2020 9:39 pm
Forum: Pictures and Videos
Topic: Some shots from Rochelle salt medium.
Replies: 4
Views: 389

Re: Some shots from Rochelle salt medium.

Very nice shots! Did you use cover glass?
by hkv
Thu Oct 08, 2020 9:37 pm
Forum: Pictures and Videos
Topic: Algal bloom under the microscope
Replies: 19
Views: 1551

Re: Algal bloom under the microscope

I can ask some people at work, Håkan. I work at the aquatic ecology department in Lund, there are quite a few people there who work experimentally on algae. And these photos are some of the best I've seen. Thank you so much Victor! What a great place to work. You must have access to a lot of sample...
by hkv
Thu Oct 08, 2020 2:43 pm
Forum: Pictures and Videos
Topic: Algal bloom under the microscope
Replies: 19
Views: 1551

Re: Algal bloom under the microscope

[ Its a shame too, a liter is about $50. Maybe contact cyanobacteria researchers in Sweden.. https://assets.thermofisher.com/TFS-Assets/LSG/product-images/A1379901.jpg-650.jpg Yes, perhaps. If I knew of any... I will see if I can get something from eBay or other low cost providers. Thermofisher is ...
by hkv
Mon Oct 05, 2020 8:14 pm
Forum: Pictures and Videos
Topic: Algal bloom under the microscope
Replies: 19
Views: 1551

Re: Algal bloom under the microscope

You might consider (unless you already have done so) BG-11 medium for culturing cyanobacteria, the variant without NaNO3 (based on a brief Google search for culturing Gloeotrichia but I suspect you've seen this too). Kind regards Wes Yes, sounds like a good idea. I have not tried BG-11. The questio...
by hkv
Sun Oct 04, 2020 6:54 pm
Forum: Pictures and Videos
Topic: Algal bloom under the microscope
Replies: 19
Views: 1551

Re: Algal bloom under the microscope

Thank you all for your comments! Really excellent images, thank you for sharing! I have tried to keep these alive in a water sample in my garage, but they are very difficult to culture and keep alive. I have tried various temperatures and lighting conditions, but all attempts have failed so far.⁣ Ha...
by hkv
Sun Oct 04, 2020 4:46 pm
Forum: Pictures and Videos
Topic: Algal bloom under the microscope
Replies: 19
Views: 1551

Algal bloom under the microscope

During the summertime, algal bloom is a problem in Sweden as well as in many other countries. The most common algae, often called Blue-Green algae, are not really algae, but belong to another group of organisms, namely Cyanobacteria. This summer we had an explosion of cyanobacteria and other algae b...
by hkv
Wed Sep 02, 2020 8:20 pm
Forum: Pictures and Videos
Topic: Programmed nuclear death in Paramecium
Replies: 17
Views: 2591

Re: Programmed nuclear death in Paramecium

Excellent work and images! Very inspirational.
by hkv
Wed Sep 02, 2020 8:08 pm
Forum: Introduce yourself
Topic: Hello from Sweden, Stockholm
Replies: 3
Views: 923

Re: Hello from Sweden, Stockholm

Welcome Gregers, I am also from Stockholm. Plenty of knowledge on this site to sort out most of the issues you will face in this fascinating hobby. As mentioned, collecting Diatoms in Mälaren is fantastic and I normally drag a net after the boat when going out with my family on boat trip. Always ple...
by hkv
Sun Aug 09, 2020 11:11 am
Forum: Pictures and Videos
Topic: A very beautiful creature (Phacus)
Replies: 13
Views: 1644

Re: A very beautiful creature (Phacus)

One of my favourite species! So elegant in the water. Optimized for gliding through the water!
by hkv
Sun Aug 09, 2020 11:05 am
Forum: Camera systems and imaging
Topic: For fluorescence microscopy, specialized microscope camera or DSLR?
Replies: 8
Views: 6053

Re: For fluorescence microscopy, specialized microscope camera or DSLR?

I totally agree with Robert here. I have also tested many microscope cameras, but I produce better images with DSLRs. One of the biggest issues I have had over the years with dedicated microscope cameras is that they require proprietary software which often is buggy and slow. Commercial software and...
by hkv
Wed Aug 05, 2020 7:45 pm
Forum: Introduce yourself
Topic: Hello from Borgholm, Sweden
Replies: 6
Views: 1178

Re: Hello from Borgholm, Sweden

Welcome Enrico! I am from Stockholm. Glad to see a fellow microscopist from Sweden here!
by hkv
Wed Aug 05, 2020 7:27 pm
Forum: Camera systems and imaging
Topic: Suggestion for Olympus CX23 Cam
Replies: 2
Views: 974

Re: Suggestion for Olympus CX23 Cam

I have the Olympus EP50 camera on my CX23. Works very well, but you could also just mount a DSLR camera and get excellent results. If you mount a DSLR, you need a series of tubes and adapters depending on your camera sensor size. If you decided to go for the DSLR route, I can give further advice on ...
by hkv
Wed Jul 29, 2020 9:23 am
Forum: Pictures and Videos
Topic: Melosira nummuloides
Replies: 11
Views: 899

Re: Melosira nummuloides

Very sharp and beautiful!
by hkv
Mon Jul 27, 2020 7:55 am
Forum: Resources (online, books etc.)
Topic: Microscopy FAQ
Replies: 13
Views: 2611

Re: Microscopy FAQ

Very useful and Fantastic work! Well Done!
by hkv
Fri Jul 24, 2020 2:15 pm
Forum: Pictures and Videos
Topic: Water mite
Replies: 12
Views: 1930

Re: Water mite

Great work!
by hkv
Wed Jul 22, 2020 9:12 pm
Forum: Pictures and Videos
Topic: Peacock feather
Replies: 11
Views: 1433

Re: Peacock feather

Hi Håkan, great images, a lot of effort well spent! And thank you for pointing out the crucial points of the method. Everybody knows that peacock feathers are beautiful, but not that they are this beautiful. Bob +1 from me ... and one more from my wife !! MichaelG. Great! I am glad she liked them!
by hkv
Wed Jul 22, 2020 3:48 pm
Forum: Pictures and Videos
Topic: Peacock feather
Replies: 11
Views: 1433

Re: Peacock feather

Thanks all!
DonSchaeffer wrote:
Wed Jul 22, 2020 3:37 pm
Beautiful! Did you use polaroid?
No, I used regular light using 4 external lamps with diffusers. No pol-filters were used.

/Håkan
by hkv
Wed Jul 22, 2020 11:06 am
Forum: Pictures and Videos
Topic: Peacock feather
Replies: 11
Views: 1433

Peacock feather

Posting some details from a Peacock feather I had in a drawer for a couple of years, waiting to be photographed. It turned out to be very difficult to photograph these feathers. Reflections were very difficult to eliminate which made focus stacking impossible as white spots do not have sufficient co...
by hkv
Mon Jul 06, 2020 7:20 pm
Forum: Pictures and Videos
Topic: Parental care with gastrotrichs
Replies: 10
Views: 851

Re: Parental care with gastrotrichs

Wow, amazing video of the amoeba eating the egg. Great work!
by hkv
Tue May 19, 2020 9:31 am
Forum: Resources (online, books etc.)
Topic: The discoverer of diatoms has been identified
Replies: 4
Views: 1157

Re: The discoverer of diatoms was identified

This was a very interesting read! Thank you for posting. Amazing how much drama these discoveries caused at the time. I love how he in 1703 described Paramecium with it's "little feet" and and "are perpetually beating about like a Spaniel in a Field". "Those Animalculi marked F. are also plentiful i...
by hkv
Thu Apr 09, 2020 3:46 pm
Forum: Pictures and Videos
Topic: Stigonema Mammilosum
Replies: 8
Views: 1060

Re: Stigonema Mammilosum

Thanks all! It is truly an interesting species but difficult to culture. I have them in a petri dish, but they are not growing at the moment. Also have a batch in culture growth media with very limited growth. Trying to make a few more strands to photograph. Will try using an oil objective. These ve...
by hkv
Wed Apr 08, 2020 6:25 pm
Forum: Pictures and Videos
Topic: A new film on a Stentor.
Replies: 4
Views: 523

Re: A new film on a Stentor.

Great effect! Almost DIC-like!
by hkv
Wed Apr 08, 2020 11:34 am
Forum: Pictures and Videos
Topic: Stigonema Mammilosum
Replies: 8
Views: 1060

Stigonema Mammilosum

This photograph shows a beautiful (and relatively large) terrestrial cyanobacteria often found growing on rocks. Stigonema Mammilosum is a short branching species that can be found as blackish crusts and biofilms on inselbergs (isolated rock hill, knob or ridge) in many places on earth. Alexander vo...
by hkv
Wed Apr 08, 2020 11:02 am
Forum: Microscopes and optics
Topic: Olympus U-AN360-3
Replies: 2
Views: 517

Re: Olympus U-AN360-3

I can send close-up pictures of all sides of it, but perhaps not the inside. I don't want to take it apart.
by hkv
Tue Apr 07, 2020 2:33 pm
Forum: Pictures and Videos
Topic: Swamps come alive.
Replies: 11
Views: 1306

Re: Swamps come alive.

What is the scale of each of the "vases" in Dinobryon. The vase shaped sections in the samples I collected are about 20 microns in length. I observed no internal structures, except what I observed below. In pictures, # 4, #5' where a vase structure contains large inclusions, they appear to be singl...