Dear microscope freaks
How would you like to run some gentle live sample imaging with a 60x objective with:
- an xy resolution of 120 nm without software tricks (or even better after deconvolution),
- the great contrast of a true confocal,
- 82 frames per second,
- or decide to bypass everything, go widefield and image at 100 frames per second with a super large field of view (220×220 um)?
Sounds good to me! 🙂
For the next 2 weeks you can do that with the new toy on demo at the LCI facility!
The beast is a new sort of spinning disk confocal and is called SoRa (Super-Resolution Optical Reassignment). It is a collaboration between Nikon and Yokogawa.
We even have 2 cameras to compare (Prime95B and BSI from Photometrics).
Oliver Garner from Bergman Labora will give a short online presentation of how SoRa works on Monday (29th) at 13:00. The presentation is done remotely and broadcasted live. You can join the audience from the comfort of your office chair by following the instructions here (please try beforehand to make sure all works).
Interested in trying it? Please contact us.
On Wednesday (13th) at 9:30 in Lipid seminar room in Neo (KI Flemingsberg), please come and enjoy a short seminar presenting a new way to label organelles in live cells.
LabLife will present their product called Viromer Cytostain.
We will stream the seminar live so you can follow it even from your desk! 🙂
Do not miss the seminar tomorrow morning at Scilife: the inventor of the CUBIC technique, Etsuo Susaki, will present his technique which can clear fatty and dense tissues.
Click here to know where and when.
And here is the link to the updated Cubic protocol.
Apply to this course at SciLife and learn about Antibody-based technologies on the 25th of March.
Poor PFA fixation often causes trouble in antibody staining. Folded cells, poorly preserved cytoskeleton… These artifacts appear when the stock of PFA gets older and degrades. Buying ready made PFA solutions, most of which contain 10-15% of methanol, can also lead to low labelling with some antibodies.
Glyoxal seems to be a good alternative. It had the added advantage that it is less toxic.
Check this article to know more. 🙂
As you all (nearlyish) know, one should never place a sample on a thick glass slide and add a coverslip. Instead, the sample should be placed on the coverslip then covered with a thick glass slide. And the coverslip should be 170 um thick (also labelled thickness #1.5).
Why is that? Because the coverslip is part of the design of the objective and all objectives from all manufacturers are designed to image through 170 um glass and assuming that the sample is directly in contact with the coverslip.
What about superfrost slides that one uses to make sure tissue sections don’t float away during antigen retrieval? No worry! You can make your own superfrost coverslips. It is cheap and you can prepare tons at the same time. Here is the protocol (and pasted below).
Not convinced? You will only see the difference when you compare side by side! The images of your tissue will be much sharper if the sample is on the coverslip because when you put your sample on the slide, either the thick glass or the mounting medium end up between the objective and the sample. The objective is not designed for this. ?
Here is the protocol:
- Gelatin-coating solution: 1 L deionized H2O, 5 g gelatin, 0.5 g chromium potassium sulfate dodecahydrate CrK(SO4)2 · 12H2O
- Filter units
- Histological slides
- Hot plate with magnetic stirrer
- Slide racks
- Staining dish
- Prepare the gelatin-coating solution by dissolving 5 g of gelatin in 1 L of heated, deionized H2O (temperature should not exceed 45 °C).
- After the gelatin has dissolved, add 0.5 g of chromium potassium sulfate dodecahydrate. Chromium potassium sulfate dodecahydrate will positively charge the slides allowing them to attract negatively charged tissue sections.
- Filter this solution and store at 2-8 °C until use. It is recommended that this solution be filtered again immediately before use (adjust to room temperature before filtration).
- Place the histological slides into metal racks.
Note: The slides should be cleaned by washing them in soapy water and rinsing them thoroughly, first in tap water and finally in deionized water.
- Dip the racks containing the slides 3 to 5 times (~5 seconds each) into the gelatin-coating solution.
- Remove the racks containing the slides and let them drain. Blot excess solution from the racks onto filter paper (gently tap the racks against the filter paper for better drainage).
- Place the racks containing the slides on the lab bench and cover them with paper towels to protect them from dust.
- Dry at room temperature for 48 hours.
- Dried slides can be put back into the boxes that they arrived in and stored at room temperature until use. Slides intended for cryostat sections can be stored at -20 °C.
Here you can see very nice video tutorials on the Alveole website and this is a cool article by Viasnoff et al about making 3D microniches with 1 um resolution! And you can do this at the LCI facility!! 🙂
Yet another chance to try RNA labelling: The FENO facility, here in Flemingsberg, has purchased a machine to multiplex RNA scope. They will present it on the 16th of October. 🙂
Here is the announcement.
We got tipped by one of our users of a robust way to label and image RNAs in cells and tissue. Here is the paper and one can buy the kit from here. Apparently it works a charm! Let us know if it works for you or not. 🙂
Expansion microscopy and clearing are fantastic tools for anyone who images thick (> 1 cell diameter) fixed samples. We are now lucky to have access to state of the art talks and hands-on workshops at Scilife in September. Register early not to be disappointed!
Please apply to Hans (first day) and David (second day) directly!