Welcome to the tutorial section. Here you will find the pictorial library of crystallization drop phenomena. Have you ever looked in the microscope and asked yourself things like:

"What is this stuff in my drop?"

"What does phase separation look like?"

"Is this what people call a spherulite?" 

If you answered "YES", then the pictorial library of crystallization drop gives you the answers to these questions. Please read the 7 guided tutorials given below.

Tutorial 1.
Appearances can be deceiving!
The first thing you should learn is that the appearance (habit, morphology, etc.) of your crystal is NOT what is important.
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Tutorial 2.
Types of precipitates.
How do I tell a "good" precipitate from a "bad" precipitate?
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Tutorial 3.
Between precipitates and crystals.
What spherulites, oils, phase separation, and gels look like in the drops. These, like crystals and precpitates, are solid phases of protein. If you get any of these phenomena in your drop, you can be close to the right conditions for obtaining crystals. Therefore it is important to be able to recognize these phenomena when you see them.
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Tutorial 4.
Are needles better than plates? How do I get from long, thin crystals to big fat ones? Click on this tutorial.
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Tutorial 5.

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Tutorial 6.
Ostwald ripening.

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Tutorial 7.
Example of an optimization experiment.
Once you get crystals in the initial screen, they will probably have to be optimized. For an example of an optimization screen with one additive, click here.
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Please send me your comments about this tutorial / library. Did you find it useful? Anything unclear or missing? Do you have some pictures you want me to include? Send me an e-mail terese@xray.bmc.uu.se.