| 21. | Experimental systems include mouse models, cultured neurons, large model synapses, isolated synaptic preparations and cell free systems.
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| 22. | Because Linux is a free system, whose code can be manipulated by anybody, it also breeds variation.
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| 23. | On one end there are those who oppose every restriction on the most free system of exchanges.
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| 24. | In 2008 he started to smoke marijuana with a carbon-free system to avoid the effects of smoke.
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| 25. | Such algorithms preserve the source-free systems.
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| 26. | For a truly pollution-free system, environmentalists argue, the hydrogen must come from a source that does not pollute.
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| 27. | A 24 / 7 toll-free system will be introduced, 138 for the helpline and 182 for security issues.
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| 28. | Germany's tuition-free system costs a total of about 50 billion marks ( dlrs 28.5 billion ) a year.
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| 29. | Among metal-free systems, dioxiranes are the best oxidants for the conversion of C-H bonds to alcohols or carbonyls.
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| 30. | However, he qualified his belief in civil liberties to exclude what he considered threats to a free system.
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