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Omar Saleh

@oasaleh

Soft/Bio physics and materials professor at UC Santa Barbara. https://labs.materials.ucsb.edu/saleh/omar/

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Latest posts by Omar Saleh @oasaleh

Yes! Various theory papers about this. The nanostar system is well suited to explore programmed crosstalk…. Funding willing, we might explore this

19.02.2026 16:11 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Yes we could, but not in this study where we engineered things to have as little crosstalk as possible. We checked and the Tm of a given phase is about the same regardless of the presence of the other eight phases.

We argue in the paper that this β€˜zero crosstalk’ limit is easier to achieve with DNA

19.02.2026 01:01 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
PNAS Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...

Work led by spectacular student Aria Chaderjian, with key insights from @samwilken.bsky.social

Paper available here:

www.pnas.org/doi/10.1073/...

(3/3)

18.02.2026 19:00 πŸ‘ 3 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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…we further show that appropriate thermal processing lead to metastable jammed-droplet layers, which are kinetically stabilized by cages formed from the diverse immiscible phases… so new types of structure and dynamics are possible with this system (2/3)

18.02.2026 18:58 πŸ‘ 5 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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New from us in @pnas.org :
We considered the limits of condensate diversity, and engineered DNA droplets to form 9 distinct, homotypic, coexisting phases. Very hard to do this except with nucleic acids. Probably you can make more than 9. (1/3)

18.02.2026 18:53 πŸ‘ 28 πŸ” 11 πŸ’¬ 2 πŸ“Œ 1

Sorry! Please feel free to return to your regularly scheduled doom scrolling.

11.02.2026 17:42 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
Diffusive and Enzymatic Modulation of the Dynamic Size Distribution of DNA Droplets An experimental model system of DNA nanoparticles shows that the droplet size distribution can be controlled by the droplets' phase separation ability.

… With enzymatic degradation, a curious behavior in which droplets disappear while their avg radius stays constant (red images).

Lovely work by post doc fellow Michio Tateno. Check out the paper at the link.

doi.org/10.1103/x2pf...

11.02.2026 17:20 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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New paper from us in PRL:
Precision measurements of DNA condensate droplets as modulated by diffusive (Ostwald) or enzymatic processes. We verify LSW models of Ostwald ripening at the level of single droplets (blue images), and observe dynamic scaling of the size distribution….

11.02.2026 17:18 πŸ‘ 6 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0

I am not sure it is a major conflict. The poster is correct that the scaffold concept has been taken too far in certain cases. But he is not questioning the entire condensate/LLPS field; to the contrary he praises certain approaches

29.11.2025 20:35 πŸ‘ 5 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Check out our paper on transcriptional control of an artificial condensate, including engineering a feedback loop that includes phase separation. Led by the amazing @samwilken.bsky.social

21.11.2025 13:38 πŸ‘ 5 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0

Done! Run fast!

29.09.2025 18:31 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

PRX Life seems like a good choice, though maybe you are thinking to aim higher? It is a great result

01.09.2025 22:44 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

β€œAs a public university, we are stewards of taxpayer resources, and a payment of this scale would completely devastate our country’s greatest public university system as well as inflict great harm on our students and all Californians.” β€”UC President James B. Milliken

08.08.2025 23:02 πŸ‘ 825 πŸ” 335 πŸ’¬ 80 πŸ“Œ 32

Best time to come is the winter, for the obvious reason (maximal weather difference between Canada and here) but also because it is the clearest time, and you get great views of the islands from that particular room

16.07.2025 00:45 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Maybe the new NSF will fund this

Seems like the kind of thing the administration will like

10.05.2025 01:09 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

How many of you are there

10.05.2025 01:05 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Hey this looks fun

Congrats!

09.05.2025 02:41 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Indeed

28.04.2025 00:02 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Research.gov - Homepage Research.gov is a partnership of Federal, research-oriented grant making agencies with a shared vision of increasing customer service for applicants while streamlining and standardizing processes amon...

No
I believe research gov went down and came back up without any issues or changes

This whole thing was strange from the start; we have all sorts of email trails and office of research paperwork on awards, right?

27.04.2025 19:09 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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This summer in beautiful Santa Barbara we will run a 3-day conference on β€œBiological Physics of Biomolecular Condensates: Bridging Theory and Experiment” June 16 to 18th. Register now: www.kitp.ucsb.edu/activities/b...

12.03.2025 15:58 πŸ‘ 20 πŸ” 12 πŸ’¬ 0 πŸ“Œ 0
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Bioinspired Phase Separation 8:00 am – 10:48 am, Friday March 21, Session MAR-W64, Anaheim Hilton, Palo Verdes (Level 4)

APSMarch attendees: eat to bed early so you can get to the 8am session on Friday: Bioinspired phase separation, wi the Lorenzo Di Michele and many other great speakers.

8am sharp in the Hilton 4th floor Palos Verdes room

summit.aps.org/events/MAR-W64

21.03.2025 04:25 πŸ‘ 7 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

Note excellent invited speakers on both days starting at 8am sharp!

14.03.2025 01:14 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
Multi-Component Active Liquids 8:00 am – 11:00 am, Thursday March 20, Session MAR-Q64, Anaheim Hilton, Palo Verdes (Level 4)

For those condensate and active fluid fans attending the APS meeting next week, please wake up early and come to our 8am sessions on Thursday and Friday, co organized by myself, Ahmad Omar, Lauren Zarzar, and Sam Wilken
Details here:

summit.aps.org/events/MAR-Q64

summit.aps.org/events/MAR-W64

14.03.2025 01:14 πŸ‘ 5 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Yeah I saw this also… was hoping to get to LA from Santa Barbara; getting to Sacramento is a bit harder

25.02.2025 16:43 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Yeah I read this yesterday… a sad ending to an article that, in the first place, was discussing intrinsic issues with the university funding model. May we be so lucky to just have those intrinsic issues in a year

20.02.2025 18:58 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

No despairing!!

Fight fight fight

13.02.2025 02:18 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

the wide scale legal action about the NIH IDC is great.

I am concerned that there is no such action for the NSF. basic research generates long term technological/economic benefit, but the long time scale makes it vulnerable to short term budget thinking

Who is championing the NSF?

10.02.2025 19:35 πŸ‘ 5 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

Well all the more reason to take quick action then!

09.02.2025 23:08 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Though even CRISPR was at least 15 years, and perhaps longer depending on which fundamental research paper you want to start counting from

09.02.2025 23:03 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

You are right

It probably varies with sector.

Some physics things are longer scale

Agreed that biotech is much faster

09.02.2025 22:59 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0