Перегляд вихідного коду сторінки The Utmost Neglected Thing About Transferase

electronic. fraxel coordinates are generally decreased on the variety if you take their own fraxel elements}, and the neighbours are sought at the new position. The translation between the original and the reduced positions is afterwards added to the coordinates of the found neighbours. In this way, we make sure that we find also atoms that are outside the 27-unit-cell block. We stop constructing the molecule when there are no new atoms connected to it by covalent bonds (all neighbours of the newly added atom layer are either too far away or already in the molecule). We stop searching for new molecules when all unused atoms in the representative unit cell (as identified by ��cell_label�� identifiers) are exhausted. (4) In the molecule list generated by the previous step, symmetry-equivalent molecules generated by each symmetry operator are present with at least one of their atoms in the representative [http://en.wikipedia.org/wiki/Transferase Transferase] unit cell. Molecules [http://www.selleckchem.com/screening/gpcr-library.html GPCR Compound Library purchase] fall in groups of symmetry-equivalent molecules. Each molecule in such a group is the symmetric image of the other molecule in the group. Not all of these images are needed for a minimal stoichiometrically correct description of the substance. Each molecular group can be identified as originating from the same atoms in the original CIF; therefore these atoms have the same site labels (from the data item) in each equivalent molecule. We thus form molecular keys K by concatenating sorted site labels for each molecule and grouping together molecules with identical keys. We then count the number of molecules under each key and find a greatest common divisor D of the molecule counts. We output only molecules from each group, where is the total count of molecules in the ith group, producing a stoichiometrically correct description of the substance. (5) The stoichiometric [http://www.selleckchem.com/products/Fasudil-HCl(HA-1077).html selleckchem] description of a substance is not yet minimal, however, since a crystal may contain more than one chemically identical molecule in the asymmetric unit and all such (crystallographically non-equivalent) molecules will be present in the output. To reduce such duplication, a chemical fingerprint, for example a Morgan fingerprint (Morgan, 1965 ?), can be used as a key for molecule grouping instead of the key K built from site labels in step 2. The Morgan algorithm introduces canonical numbering on the atomic graph. The fingerprint produced with its help would be (usually) different for covalently different molecules and equal for molecules with identical connectivities, and thus would allow one to recognize and remove chemically identical molecules, further simplifying the resulting molecular structure. Since, however, the chemical fingerprinting makes additional assumptions about molecular identity based on different chemical properties, the use of Morgan fingerprints has been made optional in the algorithm implementation.