Re: [ccp4bb] Slightly OT: crystallization teaching resources for kids

2017-01-09 Thread Tim Gruene
Dear Philippe, I mixed up the signs and agree with you nice and much more quantitative explanation. Best, Tim On Thursday 05 January 2017 10:18:53 AM DUMAS Philippe wrote: > Le Jeudi 5 Janvier 2017 08:56 CET, Tim Gruene a écrit: > > I did not follow all the previous

Re: [ccp4bb] Slightly OT: crystallization teaching resources for kids

2017-01-05 Thread Keller, Jacob
@JISCMAIL.AC.UK] On Behalf Of DUMAS Philippe (VIE) Sent: Thursday, January 05, 2017 4:19 AM To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] Slightly OT: crystallization teaching resources for kids Le Jeudi 5 Janvier 2017 08:56 CET, Tim Gruene <tim.gru...@psi.ch> a écrit: I did not foll

Re: [ccp4bb] Slightly OT: crystallization teaching resources for kids

2017-01-05 Thread VIE
Le Jeudi 5 Janvier 2017 08:56 CET, Tim Gruene a écrit: I did not follow all the previous details of this discussion, but I think one may say that the statement "The entropy of molecules arranged in a crystal must be greatly larger than in solution" is incorrect. Of course,

Re: [ccp4bb] Slightly OT: crystallization teaching resources for kids

2017-01-05 Thread Frank von Delft
I reckon you compare it to something going viral on the intertubes - most posts or videos do nothing, they only go viral if enough people share them. On 05/01/2017 07:56, Tim Gruene wrote: Dear Nicolas, are you sure this concept is correct? The entropy of molecules arranged in a crystal

Re: [ccp4bb] Slightly OT: crystallization teaching resources for kids

2017-01-04 Thread Tim Gruene
Dear Nicolas, are you sure this concept is correct? The entropy of molecules arranged in a crystal must be greatly larger than in solution. Hence the driving force for crystallisation is actually a drop in energy, and I am not sure there is actually a barrier. I would take the kids to the

Re: [ccp4bb] Slightly OT: crystallization teaching resources for kids

2017-01-04 Thread Patrick Shaw Stewart
Yes, but the kids will want to know WHY there is an energy barrier. I prefer my explanation below. Happy New Year to all Patrick _ > I am especially needing help with the concept of nucleation, and why nucleation is slower and then crystal growth faster once nuclei have

Re: [ccp4bb] Slightly OT: crystallization teaching resources for kids

2017-01-04 Thread Nicolas FOOS
Dear Evette, If I was is your situation (explaining nucleation and other concept). I will discuss in terms of energy. I mean obtaining the initial nuclei is the "costly" step in terms of energy. To represent that, out the classical curve of energy, I will use a metaphoric representation