I was wondering in what ways do you deposit fiducials and what do you use as fiducials. We have tried fluorescent beads (tetra speck) and colloidal gold particles. But I am not really satisfied by both of them, while the tetra specks are bright and nice to use for multi color experiments they are a …

I think it holds true for both techniques but I am mainly doing dSTORM, so localization.

So for doing iPALM, we use gold nanorods (I need to look up the specs). To prep, we clean cover slips in acid piranha, sonicate and wash with diH2O, coat with Poly-L-Lysine, deposit gold nanorods using a spin-coater, then sputter coat with silicone dioxide. We can get them to show up in 488, 561, an…

Thanks for the reply! So that is a nice method for depositing on the coverslip, can you also use it to deposit on top of cells? I will definetely look into the nanorods.

No this isn’t viable for depositing fiducials onto cells. We prep batches in advance and then plate cells right on top. The silicone dioxide layer makes sure the cells only see glass so (generally) we then treat the cover slips as any other and coat for cell growth, etc.

We have used various products from Gattaquant to solve issues like this. Gattabeads may be of some use. They’re specifically designed to not be too bright. http://www.gattaquant.com/products/gatta-beads.html I’ve used these 40nm beads successfully before now, although they can be very challenging …

Thanks, Ive been also looking for some nice sub resolution beads for STED and SIM as well, will test them. Are these also multicolor for channel allignment? Maybe I can additionally clarify a bit more where we come from. We’ve been doing 2 color and 3 color dSTORM and have done channel allignment a…

Yes, I used the 40nm beads to ‘solve’ or attempt to solve the issue you suggest. In terms of labelling the sample, its more challenging. I have tried drying beads onto coverslips then adding cells (and hoping they don’t float off) with some success. Obv no good with 3D. I have also spun beads onto c…

Hello @JASlotman , I work on dSTORM too. It looks like you’re facing a few problems that we also face while doing our experiments: Fiducials are too bright We use a circular iris in the beam path and slowly close it until the edge of the circle is near to where the fiducial is at. We usually pos…

These are expensive, but fully characterized coverslips with gold beads deposited and then SiO2 sputtered on top. http://hestzig.com/index_files/Page497.htm

Fiducials in Single Molecule Imaging

Probes & Prep

JawnnyH September 13, 2019, 3:16pm 2

Can you clarify: are you asking about single molecule tracking or single molecule localization?

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