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Space group determination: Difference between revisions
→Space groups as combinations of symmetry elements
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| mmm || oF || 22 || - || | | mmm || oF || 22 || - || | ||
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| mmm || oI || 23 || 24 || screw axis extinctions do '''not''' let you decide because the I centering results in h+k+l=2n and the screw axis extinction 00l=2n is just a special case of that. | | mmm || oI || 23 || 24 || screw axis extinctions do '''not''' let you decide because the I centering results in h+k+l=2n and the screw axis extinction 00l=2n is just a special case of that. 23/24 do '''not''' form an enantiomorphic, but a ''special'' pair (ITC A §3.5, p. 46 in the 1995 edition). | ||
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| 4/m || tP || 75 || 76, 77, 78 || screw axis extinctions let you decide, except between 76/78 enantiomorphs | | 4/m || tP || 75 || 76, 77, 78 || screw axis extinctions let you decide, except between 76/78 enantiomorphs | ||
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| m-3 || cF || 196 || - || | | m-3 || cF || 196 || - || | ||
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| m-3 || cI || 197 || 199 || screw axis extinctions do '''not''' let you decide because the I centering results in h+k+l=2n and the screw axis extinction 00l=2n is just a special case of that. | | m-3 || cI || 197 || 199 || screw axis extinctions do '''not''' let you decide because the I centering results in h+k+l=2n and the screw axis extinction 00l=2n is just a special case of that. 197/199 do '''not''' form an enantiomorphic, but a ''special'' pair (ITC A §3.5, p. 46 in the 1995 edition). | ||
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| m-3m || cP || 207 || 208, 212, 213 || screw axis extinctions let you decide, except between 212/213 enantiomorphs | | m-3m || cP || 207 || 208, 212, 213 || screw axis extinctions let you decide, except between 212/213 enantiomorphs | ||
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If you find an error in the table please send an email to kay dot diederichs at uni-konstanz dot de ! | If you find an error in the table please send an email to kay dot diederichs at uni-konstanz dot de ! | ||
== The 65 space groups in which proteins composed of L-amino acids can crystallize == | == The 65 space groups in which proteins composed of L-amino acids can crystallize == | ||