Re: [ccp4bb] request for applications

2024-04-01 Thread Nukri Sanishvili
Hi James, The elevator pitch has to be 90 degrees, no? Otherwise it would travel horizontally as well. Or, perhaps, we should petition these types of elevators to be added to building codes for large, multi-entrance buildings? Best, Nukri On Mon, Apr 1, 2024 at 10:08 AM James Holton wrote: >

Re: [ccp4bb] Room temperature change from 25ºC to 20ºC

2024-04-01 Thread Nukri Sanishvili
Excellent idea, Mark! I think the solution to your dilemma is rather straightforward: we introduce a Winter Standard Room Temperature (WSRT) and a Summer Standard Room Temperature (SSRT). This way, the folks from locales closer to the equator can always use SSRT, while those from more temperate

Re: [ccp4bb] An exciting school on MX in Bangkok, Thailand

2023-12-04 Thread Nukri Sanishvili
The workshop website at https://seacoast.kmutt.ac.th/2024/ On Mon, Dec 4, 2023 at 8:21 PM Nukri Sanishvili wrote: > Dear potential applicants, > > This is a friendly reminder that the deadline for application to the > crystallographic workshop in Bangkok, Thailand, is fast approa

Re: [ccp4bb] An exciting school on MX in Bangkok, Thailand

2023-12-04 Thread Nukri Sanishvili
.* For *the application form, the program, and all other details, please visit the workshop website:* On Sun, Oct 15, 2023 at 10:29 PM Nukri Sanishvili wrote: > Dear All, > > We are very excited to let everyone know that after a Covid19-induced > pause, we are renewing our macromolecular crystallogr

[ccp4bb] An exciting school on MX in Bangkok, Thailand

2023-10-15 Thread Nukri Sanishvili
Dear All, We are very excited to let everyone know that after a Covid19-induced pause, we are renewing our macromolecular crystallographic school “*South-East Asian Crystallographic Overview And Systematic Training”* *(SEA COAST)**, organized jointly by King Mongkut’s University of Technology,

Re: [ccp4bb] British X-ray Crystallographers

2023-05-27 Thread Nukri Sanishvili
Hi Elspeth, You are right on the political correctness topic. However, the modern term would be Garthem, not Garperson... :) Best, Nukri On Wed, May 24, 2023 at 5:14 AM Elspeth Garman < elspeth.gar...@bioch.ox.ac.uk> wrote: > Thanks a lot Harry! Unfortunately there is only one of me so it should

Re: [ccp4bb] Alexey Vagin

2023-03-26 Thread Nukri Sanishvili
Sad news indeed for so many of us, those who knew Alexei personally and those who benefited professionally from his selfless dedication to computational crystallography. A wise man once said something along the lines of anyone successful today standing on the shoulders of giants of the past.

Re: [ccp4bb] Future Diffraction Methods

2023-01-29 Thread Nukri Sanishvili
eeting from two different domains, well, I guess you will end up having > two bubbles of people clustered by their field of interest. > > Same disclaimer goes here as yours -- no offence to any one, just thinking > out loud... > > All the best! > Pavel > > On

Re: [ccp4bb] Future Diffraction Methods

2023-01-29 Thread Nukri Sanishvili
Hi James, This meeting has indeed been one of the best ones by its format, content, and atmosphere. Many thanks to all the organizers and attendees of the past. Nevertheless, it is not surprising that it was cancelled, given the trends in structural biology research. Straightforward evolutionary

Re: [ccp4bb] Off topic: Are all storage dewars equal?

2022-07-06 Thread Nukri Sanishvili
Hi Carmien, It appears to me that the dewars in your first link are those made by Taylor Wharton. You can do a search with that name and hopefully find less expensive options. We've used them for many years and they are good. Another one, you could try, is VME https://mvebio.com/aluminum-dewars/

Re: [ccp4bb] X-ray crystallography defense questions

2022-06-14 Thread Nukri Sanishvili
Hi Jessica, Your subject being membrane proteins, I might ask a question if your conclusions and claims are commensurate with the data quality but as Eleanor says, it really depends on what you are actually claiming and what kind of data you have. Cheers, Nukri On Tue, Jun 14, 2022 at 10:59 AM

Re: [ccp4bb] pictures in emails

2021-07-19 Thread Nukri Sanishvili
Hi Frank, CCP4bb-ers, While the progress in the digital world in 2021 over the 90s is undeniable (which, unfortunately cannot be said about the analog world), we should keep in mind that some institutional accounts may filter out the "suspiciously" large emails. I would not be surprised if some of

Re: [ccp4bb] Strange indexing problem

2021-07-05 Thread Nukri Sanishvili
Hi Rob, There is no information provided to think what might be the problem with indexing. How confident are you in the direct beam coordinates? Are any of the cell lengths long-ish? It may not be enough but at a minimum, two images 90 degrees apart might be helpful. Preferably, they would be

Re: [ccp4bb] Suggestions to improve resolution of protein crystals

2021-03-21 Thread Nukri Sanishvili
Dear Saurab, It's a shame these crystals do not diffract well - they look so good! I assume the diffraction you saw was recorded at cryo temperatures? If so, it is possible that you may be damaging the crystals during cryo-pretection and cryo-cooling. Before you go too deep into changing the

Re: [ccp4bb] Student Question--Negative Difference Density in some Histidine side chains in Iron Coordination complex in 2XGF T4 Phage Model Structure

2021-02-22 Thread Nukri Sanishvili
Sorry, in my previous email I was oblivious to the fact that there was Fe. Iron is almost certainly oxidized. So, if you started collecting data with reduced iron, but it got oxidized during data collection, you are probably using the parametrization for the reduced rather than oxidized one in the

Re: [ccp4bb] Student Question--Negative Difference Density in some Histidine side chains in Iron Coordination complex in 2XGF T4 Phage Model Structure

2021-02-22 Thread Nukri Sanishvili
Is the oxidation state of the coordinated atom, or the identity of that atom correct? If there was a very slightly bigger atom, it would take care of the positive residual density and would push out the His side chains a little bit, which in turn could take care of the negative ones. Or, the same

Re: [ccp4bb] Tiny rocks on my CX100 shipping dewar

2020-12-04 Thread Nukri Sanishvili
Hi John, I think I know what might have happened: Many of the MX beamlines at the APS use some sort of filler in the containers where the LN2 is dumped. If I remember correctly, one of the beamlines is using fine gravel for this purpose. Also, it is required that before shipping, the dewars are

Re: [ccp4bb] Tiny rocks on my CX100 shipping dewar

2020-12-04 Thread Nukri Sanishvili
Hi John, These look like real pebbles. If so, they would not word as an absorbent. It looks more like a bad joke. Was the FedEx driver expecting some kind of Thanksgiving gift from you? Wait till Christmas time then to see the real surprises... Best, Nukri On Fri, Dec 4, 2020 at 10:05 AM Tanner,

Re: [ccp4bb] polarizer

2020-08-16 Thread Nukri Sanishvili
Hi All, Adding some more details to what's been said already. Only because I've seen too many times the polarizers being used incorrectly. First, you need two polarization filters which are typically called polarizer and analyzer. First one (the polarizer) lets through only the light waves of a

Re: [ccp4bb] Molecular replacement problem

2020-06-18 Thread Nukri Sanishvili
Hi Robert, In addition to the great suggestions you already have received, maybe you should also consider SIMBAD or similar programs? The behavior you are describing is typical of, albeit not exclusive to, having crystallized a contaminant protein. Good luck! Nukri On Thu, Jun 18, 2020, 08:01

Re: [ccp4bb] A question of density

2020-03-04 Thread Nukri Sanishvili
Hi Jessica, You do not say how well is the rest of the structure refined. First, you should refine the structure best you can, without placing anything in the unclear blob of your interest so to obtain the best possible phases and hopefully improve the blob density as well. Then you should let the

[ccp4bb] Reminder: Crystallographic school in Thailand

2019-11-06 Thread Nukri Sanishvili
Dear Colleagues, This is a friendly reminder that we will be organizing a second crystallographic school in Bangkok, Thailand, January 21-29, 2020. The school will cover all aspects of macromolecular crystallography and *a big part will be dedicated to the practical problem-solving sessions where

Re: [ccp4bb] SeMet data

2019-08-27 Thread Nukri Sanishvili
nd MAD with peak 12661 (0.9793 Å) and inflection > 12658 (0.9795 Å) > > Thanks again, > Lindsey > > > On Aug 26, 2019, at 6:54 PM, Nukri Sanishvili wrote: > > Hi Lindsey, > Obviously, one would need a lot more information to properly diagnose the > problem and I am su

Re: [ccp4bb] SeMet data

2019-08-26 Thread Nukri Sanishvili
Hi Lindsey, Obviously, one would need a lot more information to properly diagnose the problem and I am sure much smarter people them me will ask you for that. But just to move the task by couple of steps, I want to point out couple of things. 1. Trivial question: did you have the anomalous option

Re: [ccp4bb] challenges in structural biology

2019-07-15 Thread Nukri Sanishvili
I know it is going to hijack the original topic but I could not help... “The reports of death of (macromolecular) crystallography are greatly exaggerated. If we believed the prognosticators, it has been dead since the 80s when some folks made the claim that the only relevant structures were those

Re: [ccp4bb] Fo-Fc density close to cysteine residue

2019-07-10 Thread Nukri Sanishvili
Hi Jakob, If there is radiation damage, for every "new" positive density there should be a negative density in the original position. From the pictures we've seen, it seems unlikely. Best, Nukri On Wed, Jul 10, 2019 at 10:21 AM Keller, Jacob wrote: > How about radiation-damaged/smashed Sulphur?

Re: [ccp4bb] how many crystallographers are there?

2019-05-29 Thread Nukri Sanishvili
Dear Scott, For the grant application, better question might be how many structural biologists are out there, because "a crystallographer" may be interpreted differently depending who is reading the grant application: are these the people who know crystallography, or people who solve structures

Re: [ccp4bb] Unknown anomalous scatterer

2019-03-15 Thread Nukri Sanishvili
Hi Aleix, Can you describe how you did the fluorescence scan, or share the plot itself? I am asking this because you say you could discard Fe, Zn and As/Se but you don't say anything about Cu which is in between these elements. If you tried but could not discard Cu, then it could be your

Re: [ccp4bb] vitrification vs freezing

2012-11-15 Thread Nukri Sanishvili
s: An alternative way to avoid the argument and discussion all together is to use cryo-cooled. Tim: You go to a restaurant, spend all that time and money and order a fruitcake? Cheers, N. On 11/15/2012 11:59 AM, Tim Gruene wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Dear s, I have

Re: [ccp4bb] vitrification vs freezing

2012-11-15 Thread Nukri Sanishvili
Hi Ethan, I am not a linguist of Greek or even of English but I would assume that the term cryo-cooling is advocated not by DRD but by the people who want to distinguish between cooling down to *cryogenic* temperatures and say, cooling from 25 C to 4 C. Cheers, N. On 11/15/2012 12:45 PM,