Re: [ccp4bb] Purchasing slides with diffraction gratings for teaching diffraction

[Phoebe A. Rice]

Slightly off-topic, and I may have recommended these some time ago on the BB 
(sorry), but we find these toy turtles very useful for explaining symmetry, 
particularly screw axes which some students have a really hard time visualizing 
from 2D diagrams:

https://www.amazon.com/Fat-Brain-Toys-FA042-1-Reptangles/dp/B00392NSQ4/ref=sr_1_2?ie=UTF8=1549988668=8-2=reptangles

You can assemble an amazing array of symmetries with these things.

~~~
Phoebe A. Rice
Dept. of Biochem & Mol. Biol. and
  Committee on Microbiology
https://voices.uchicago.edu/phoebericelab/



From: CCP4 bulletin board  on behalf of Marin van Heel 
<057a89ab08a1-dmarc-requ...@jiscmail.ac.uk>
Reply-To: Marin van Heel 
Date: Tuesday, March 5, 2019 at 3:28 PM
To: "CCP4BB@JISCMAIL.AC.UK" 
Subject: Re: [ccp4bb] Purchasing slides with diffraction gratings for teaching 
diffraction

Dear Pietro

I have used many different gratings for the purpose over many years...  Ones 
that I found very rewarding are writeable CDs and DVDs. They often come in a 
pack "protected" by a empty CD / DVD matrix hat is only plastic with grooves 
and no silver (or whatever the shiny recording material is).  Burnig your own 
CDs DVDs has gone somwhat out of fashion so you may have a problem finding 
those transparent ones. But if you have a RED/GREEN laser pointer and empty CD 
/ DVDs all kinds of diffraction experiments are possible. Since DVDs are 
designed for green/blue lasers, the red laser diffraction rapidly goes 
evanescent on a DVD. On the other hand a green or blue laser on a CD matrix 
gives you many diffraction orders on white wall in a dark lecture hall. Nylon 
flags and other woven materials can give excellent diffraction patterns.  Great 
fun! Decades of students at Imperial and other places 
(www.brazil-school.org<http://www.brazil-school.org>) enjoyed those 
crystallography/cryo-EM demos!
My two cents,

Marin

On Tue, Mar 5, 2019 at 6:52 AM Roversi, Pietro (Dr.) 
mailto:pr...@leicester.ac.uk>> wrote:
Dear all,

I'd like to purchase slides with diffraction gratings for educational purposes.

Ideally, to be used with a visible-light laser pointer.

And: with 1D and 2D patterns, of variable repeats - so as to be able to 
illustrate the effect on the spacing in reciprocal space, as it were.

I am looking online but not having much joy.

Can anyone recommend a good provider to purchase from?

Thank you!

Pietro



Pietro Roversi

LISCB Wellcome Trust ISSF Fellow

https://bit.ly/2I4Wm5Z


Leicester Institute of Structural and Chemical Biology
Department of Molecular and Cell Biology, University of Leicester
Henry Wellcome Building
Lancaster Road, Leicester, LE1 7HB
England, United Kingdom

Tel. +44 (0)116 2297237




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Re: [ccp4bb] Purchasing slides with diffraction gratings for teaching diffraction

[Marin van Heel]

Dear Pietro

I have used many different gratings for the purpose over many years...
Ones that I found very rewarding are writeable CDs and DVDs. They often
come in a pack "protected" by a empty CD / DVD matrix hat is only plastic
with grooves and no silver (or whatever the shiny recording material is).
Burnig your own CDs DVDs has gone somwhat out of fashion so you may have a
problem finding those transparent ones. But if you have a RED/GREEN laser
pointer and empty CD / DVDs all kinds of diffraction experiments are
possible. Since DVDs are designed for green/blue lasers, the red laser
diffraction rapidly goes evanescent on a DVD. On the other hand a green or
blue laser on a CD matrix gives you many diffraction orders on white wall
in a dark lecture hall. Nylon flags and other woven materials can give
excellent diffraction patterns.  Great fun! Decades of students at Imperial
and other places (www.brazil-school.org) enjoyed those
crystallography/cryo-EM demos!
My two cents,

Marin

On Tue, Mar 5, 2019 at 6:52 AM Roversi, Pietro (Dr.) 
wrote:

> Dear all,
>
> I'd like to purchase slides with diffraction gratings for educational
> purposes.
>
> Ideally, to be used with a visible-light laser pointer.
>
> And: with 1D and 2D patterns, of variable repeats - so as to be able to
> illustrate the effect on the spacing in reciprocal space, as it were.
>
> I am looking online but not having much joy.
>
> Can anyone recommend a good provider to purchase from?
>
> Thank you!
>
> Pietro
>
>
> Pietro Roversi
>
> LISCB Wellcome Trust ISSF Fellow
>
> https://bit.ly/2I4Wm5Z
>
>
> Leicester Institute of Structural and Chemical Biology
> Department of Molecular and Cell Biology, University of Leicester
> Henry Wellcome Building
> Lancaster Road, Leicester, LE1 7HB
> England, United Kingdom
>
> Tel. +44 (0)116 2297237
>
>
> --
>
> To unsubscribe from the CCP4BB list, click the following link:
> https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB=1
>



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Re: [ccp4bb] Purchasing slides with diffraction gratings for teaching diffraction

[Eckhard Hofmann]

Dear Pietro,
I'am using the slides from the ICE:
https://icestore.chem.wisc.edu/product/optical-transform-kit
Cheers,
Eckhard

Am 05.03.2019 um 10:41 schrieb Roversi, Pietro (Dr.):

Dear all,

I'd like to purchase slides with diffraction gratings for educational 
purposes.


Ideally, to be used with a visible-light laser pointer.

And: with 1D and 2D patterns, of variable repeats - so as to be able to 
illustrate the effect on the spacing in reciprocal space, as it were.


I am looking online but not having much joy.

Can anyone recommend a good provider to purchase from?

Thank you!

Pietro


Pietro Roversi

LISCB Wellcome Trust ISSF Fellow

https://bit.ly/2I4Wm5Z


Leicester Institute of Structural and Chemical Biology
Department of Molecular and Cell Biology, University of Leicester
Henry Wellcome Building
Lancaster Road, Leicester, LE1 7HB
England, United Kingdom

Tel. +44 (0)116 2297237




To unsubscribe from the CCP4BB list, click the following link:
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--
Eckhard Hofmann 
Ruhr-Uni Bochum
AG Proteinkristallographie, LS Biophysik, ND04/318
44780 Bochum
Tel: +49-(0)234/32-24463, Sekr. -24461, FAX: -14762
ORCID: -0003-4874-372X



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Re: [ccp4bb] Purchasing slides with diffraction gratings for teaching diffraction

[Roversi, Pietro (Dr.)]

Thank you Philippe,

this sound wonderful, I cannot download the PDF (dangling link ) - would you be 
able to let me have it?

THanks

P


Pietro Roversi

LISCB Wellcome Trust ISSF Fellow

https://bit.ly/2I4Wm5Z


Leicester Institute of Structural and Chemical Biology
Department of Molecular and Cell Biology, University of Leicester
Henry Wellcome Building
Lancaster Road, Leicester, LE1 7HB
England, United Kingdom

Tel. +44 (0)116 2297237



From: DUMAS Philippe (IGBMC) 
Sent: 05 March 2019 11:20
To: Roversi, Pietro (Dr.)
Cc: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Purchasing slides with diffraction gratings for teaching 
diffraction


Le Mardi 5 Mars 2019 10:41 CET, "Roversi, Pietro (Dr.)"  
a écrit:

Many years ago I did teaching on diffraction by illustrating the major aspects 
of crystal structure determination with 2D crystals on 24x36 films. The crystal 
was an 80x60 repeats of the famous Einstein's tongue and MIR was illustrated 
with "beauty spots" added on Einstein's face. You can have a look to the 
attached diffraction image and  to the little article in the IUCr newsletter on 
teaching, June 2006:

https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.iucr.org%2Fresources%2Fcommissions%2Fcrystallographic-teaching%2Fnewsletters%2F1data=02%7C01%7Cpr159%40LEICESTER.AC.UK%7Cb4f780455a9b465f1e7008d6a15c97db%7Caebecd6a31d44b0195ce8274afe853d9%7C0%7C0%7C636873816792495402sdata=ZdrsO9w1D1IdoBboNzkNaSBGH%2FgmuoirOpV43kIIwPk%3Dreserved=0

Two remarks:
First, unfortunately, the web site indicated in the article is essentially 
"dead" (but not completely) due to license problems with WebMathematica.
Second, it is mentioned in the article that Friedel's law was significantly 
violated and that this was due to bad alignment of the negative film in the 
optical diffractometer. I'm no more sure that this is exact and I am wondering 
whether this could be due to a much more interesting effect of "anomalous 
diffraction" due to different optic lengths within the negative resulting from 
different amounts of reduced silver. (Does anyone has an idea about that?). If 
this were true, then on could imagine solving the Einstein's crystal structure, 
not only by MIR as shown initially, but also by SAD, and this would be very 
interesting. I long thought that I should come back to this teaching problem, 
but I never did it. Who knows: someone else could be interested...

I would be very glad of sending you some "2D Einstein's tongue crystals" for 
your teaching.

All the best
Philippe Dumas



> Dear all,
>
> I'd like to purchase slides with diffraction gratings for educational 
> purposes.
>
> Ideally, to be used with a visible-light laser pointer.
>
> And: with 1D and 2D patterns, of variable repeats - so as to be able to 
> illustrate the effect on the spacing in reciprocal space, as it were.
>
> I am looking online but not having much joy.
>
> Can anyone recommend a good provider to purchase from?
>
> Thank you!
>
> Pietro
>
>
>
> Pietro Roversi
>
> LISCB Wellcome Trust ISSF Fellow
>
> https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbit.ly%2F2I4Wm5Zdata=02%7C01%7Cpr159%40LEICESTER.AC.UK%7Cb4f780455a9b465f1e7008d6a15c97db%7Caebecd6a31d44b0195ce8274afe853d9%7C0%7C0%7C636873816792495402sdata=zckaNtXXC1zE2Z%2Bo4PxKrIOFji5fqM38hv%2BxTj5iulo%3Dreserved=0
>
>
> Leicester Institute of Structural and Chemical Biology
> Department of Molecular and Cell Biology, University of Leicester
> Henry Wellcome Building
> Lancaster Road, Leicester, LE1 7HB
> England, United Kingdom
>
> Tel. +44 (0)116 2297237
>
>
> 
>
> To unsubscribe from the CCP4BB list, click the following link:
> https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.jiscmail.ac.uk%2Fcgi-bin%2Fwebadmin%3FSUBED1%3DCCP4BB%26A%3D1data=02%7C01%7Cpr159%40LEICESTER.AC.UK%7Cb4f780455a9b465f1e7008d6a15c97db%7Caebecd6a31d44b0195ce8274afe853d9%7C0%7C0%7C636873816792495402sdata=Jsr617oO%2B%2BIbkuqM0EYPlrkMdJBnezdi%2Bg%2B8bB%2BHqL0%3Dreserved=0








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Re: [ccp4bb] Purchasing slides with diffraction gratings for teaching diffraction

[IGBMC]

Le Mardi 5 Mars 2019 10:41 CET, "Roversi, Pietro (Dr.)"  
a écrit:

Many years ago I did teaching on diffraction by illustrating the major aspects 
of crystal structure determination with 2D crystals on 24x36 films. The crystal 
was an 80x60 repeats of the famous Einstein's tongue and MIR was illustrated 
with "beauty spots" added on Einstein's face. You can have a look to the 
attached diffraction image and  to the little article in the IUCr newsletter on 
teaching, June 2006:

https://www.iucr.org/resources/commissions/crystallographic-teaching/newsletters/1

Two remarks:
First, unfortunately, the web site indicated in the article is essentially 
"dead" (but not completely) due to license problems with WebMathematica.
Second, it is mentioned in the article that Friedel's law was significantly 
violated and that this was due to bad alignment of the negative film in the 
optical diffractometer. I'm no more sure that this is exact and I am wondering 
whether this could be due to a much more interesting effect of "anomalous 
diffraction" due to different optic lengths within the negative resulting from 
different amounts of reduced silver. (Does anyone has an idea about that?). If 
this were true, then on could imagine solving the Einstein's crystal structure, 
not only by MIR as shown initially, but also by SAD, and this would be very 
interesting. I long thought that I should come back to this teaching problem, 
but I never did it. Who knows: someone else could be interested...

I would be very glad of sending you some "2D Einstein's tongue crystals" for 
your teaching.

All the best
Philippe Dumas



> Dear all,
>
> I'd like to purchase slides with diffraction gratings for educational 
> purposes.
>
> Ideally, to be used with a visible-light laser pointer.
>
> And: with 1D and 2D patterns, of variable repeats - so as to be able to 
> illustrate the effect on the spacing in reciprocal space, as it were.
>
> I am looking online but not having much joy.
>
> Can anyone recommend a good provider to purchase from?
>
> Thank you!
>
> Pietro
>
>
>
> Pietro Roversi
>
> LISCB Wellcome Trust ISSF Fellow
>
> https://bit.ly/2I4Wm5Z
>
>
> Leicester Institute of Structural and Chemical Biology
> Department of Molecular and Cell Biology, University of Leicester
> Henry Wellcome Building
> Lancaster Road, Leicester, LE1 7HB
> England, United Kingdom
>
> Tel. +44 (0)116 2297237
>
>
> 
>
> To unsubscribe from the CCP4BB list, click the following link:
> https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB=1








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DiffractionEisteinTongue.pdf
Description: Adobe PDF document

Re: [ccp4bb] Purchasing slides with diffraction gratings for teaching diffraction

[Savvas Savvides]

Dear Pietro
the ones that I have just used in my lecture are from 
https://www.patonhawksley.com 

best wishes
Savvas

> On 5 Mar 2019, at 10:41, Roversi, Pietro (Dr.)  wrote:
> 
> Dear all,
> 
> I'd like to purchase slides with diffraction gratings for educational 
> purposes.
> 
> Ideally, to be used with a visible-light laser pointer.
> 
> And: with 1D and 2D patterns, of variable repeats - so as to be able to 
> illustrate the effect on the spacing in reciprocal space, as it were.
> 
> I am looking online but not having much joy.
> 
> Can anyone recommend a good provider to purchase from?
> 
> Thank you!
> 
> Pietro
> 
> 
> Pietro Roversi
> LISCB Wellcome Trust ISSF Fellow
> https://bit.ly/2I4Wm5Z 
> 
> Leicester Institute of Structural and Chemical Biology
> Department of Molecular and Cell Biology, University of Leicester
> Henry Wellcome Building
> Lancaster Road, Leicester, LE1 7HB
> England, United Kingdom
> 
> Tel. +44 (0)116 2297237
> 
> 
> To unsubscribe from the CCP4BB list, click the following link:
> https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB=1 
> 



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[ccp4bb] Purchasing slides with diffraction gratings for teaching diffraction

[Roversi, Pietro (Dr.)]

Dear all,

I'd like to purchase slides with diffraction gratings for educational purposes.

Ideally, to be used with a visible-light laser pointer.

And: with 1D and 2D patterns, of variable repeats - so as to be able to 
illustrate the effect on the spacing in reciprocal space, as it were.

I am looking online but not having much joy.

Can anyone recommend a good provider to purchase from?

Thank you!

Pietro



Pietro Roversi

LISCB Wellcome Trust ISSF Fellow

https://bit.ly/2I4Wm5Z


Leicester Institute of Structural and Chemical Biology
Department of Molecular and Cell Biology, University of Leicester
Henry Wellcome Building
Lancaster Road, Leicester, LE1 7HB
England, United Kingdom

Tel. +44 (0)116 2297237




To unsubscribe from the CCP4BB list, click the following link:
https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB=1