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Doesn't this just change the question to "what observation:parameter ratio is
needed for my structure to be over-determined?"?
As near as I'm aware, the answer to that one seems to be "as many observations
as you get".
Pete
-Original Message-
From: CCP4 bulletin board on behalf of [EMA
On May 15, 2008, at 12:40 PM, Ed Pozharski wrote:
I was just trying to
protect poor creatures, after all they [hydrogens] only got one
electron to hold on
to (:-)
Ed.
A less radical view (pun intended) suggests two. ;)
Colleagues,
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We are about to release an all-LED based UV microscope for automated
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-Original Message-
From: CCP4 bulletin board [mailto:[EMAIL PROTECTED] On Behalf Of Li
Zh
Sure, it has very little to do with original question about what
constitutes "high" resolution. And that term is quite relative. 1.8A
data is definitely of higher resolution than 2A, but is it "high"? (Not
to mention the issue of subjective choice of resolution cutoff). The
only way to define t
The electrons on the hydrogens won't be centered about the proton
nucleus, so if you want to resolve that as anything more than a bump,
you will need a lot better than 1 Å (or neutrons). But in fairness
the original question asked what you can call "high" resolution, not
what you can call
Of course. However, C=0 bond is ~1.2A, and bonds made by those pesky
hydrogens are ~1A. And I would think (it is semantics again) that to
reach atomic resolution you have to resolve all atoms, otherwise
"All atoms are equal, but some (non-hydrogens) are more equal than
others."
Cheers,
Ed.
O
Optical reconstructions are intensity based.
Xtallographic FT are amplitude based.
The theoretical value for xray is about 0.9*dmin.
Reading:
Stenkamp, R.E. and L.H. Jensen. 1984 Resolution revisited. Acta Cryst., A40,
251-254.
and the SFCHECK paper for other considerations
Vaguine AA, Richelle J,
I don't think the term "high resolution" has any real definition or
meaning anymore. If you're proud of the resolution, put the number in
the title of the paper and let the reader decide. At one time 2 A was
high resolution, but I wouldn't consider that high resolution today
for a plain v
On Thu, 15 May 2008, William Scott wrote:
On May 15, 2008, at 10:01 AM, Ed Pozharski wrote:
1.2A (not surprisingly since this is about the length of covalent
bond).
A carbon-carbon single bond is about 1.55 Å.
the van der Waals radius of hydrogen is 1.2A (Eisenberg/Crothers, Pauling,
1960 )
Actually, if you want to feel really good, I learned (in the context
of optics) that you can resolve two points separated by a distance x
with a diffraction limit of x/0.7, so this means you can start to see
carbon - carbon atomicity at 2.2 Å.
On May 15, 2008, at 10:12 AM, Gloria Borgstahl w
On May 15, 2008, at 10:01 AM, Ed Pozharski wrote:
1.2A (not surprisingly since this is about the length of covalent
bond).
A carbon-carbon single bond is about 1.55 Å.
I don't think that individual atoms can be RESOLVED at 2A resolution.
Even if we forget that hydrogen is also an atom, it is still true that
peaks in electron density corresponding to, say, covalently bonded atoms
are not separated. If atomic positions at 2A would be over-determined,
we won't need
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On 14 May, Mark Del Campo wrote:
> At what refinement resolution or resolution ranges would you call a structure
> "high resolution" vs.
> "low resolution"? I realize that this may boil down to semantics (e.g. some
> may classify structures as
> "medium resolution"), but I wanted to get an opi
I put an array of UV LEDS on a ceramic block and connected to a power source,
as a means of detecting very small crystals once they are in the loop. The
most difficult part was supporting the LED block so that it shone onto the loop
but did not obstruct the user. The so-called UV LEDS are ofte
Hello,
You may want to have a look at the UV LEDs, which should be the cheapest
option if you only need a specific wavelenth.
I found this on google: http://www.3dzled.com/other.html. It seems that they
can make 280nM LEDs. It is interesting to note that they also said these
LEDs' "Wavelengt
An exciting research opportunity in the ion channel structure and
mechanism area is available for a highly motivated post-doctoral
fellow at the Weill Medical College of Cornell University in New York
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Alfredo,
It's not clear from your email what your purpose is: to illuminate a
crystal/sample on a microscope stage or on a goniostat. In either
case, you might check out Ocean Optics (http://
www.oceanoptics.com/). They have based their systems on fiber optic
light sources and CCD detec
An exciting research opportunity in the ion channel structure and
mechanism area is available for a highly motivated post-doctoral
fellow at the Weill Medical College of Cornell University in New York
City, Department of Anesthesiology. The research focuses on analyzing
ion channel function wit
Dear All,
I would like to draw your attention to the following position currently open at
Diamond to establish and run a crystallography service for industrial users of
the synchrotron.
Regards
Elizabeth
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