Section storage

Proteins (and hence their epitopes) seem to survive indefinitely in an unchanged state once they are fixed and preserved in paraffin wax. This means that archived blocks are available for retrospective immuncxytochemical investigations. 

There is less certainty about paraffin sections. It seems that most epitopes remain unaffected in stored sections (6), although some workers have reported 

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Wester, K., Wahlund, E., Sundstrom, C., Ranefall, P., Bengtsson, E., Russel, P. J., Ow, K. T., Malmstrom, P.-U., and Busch, C. 2000. Paraffin section storage and immunohistochemistry. Effects of time, temperature, fixation and retrieval. Protocol with emphasis on p53 protein and MIB1 antigen. Appl. Immunohistochem. Mol. Morphol. 8 61-70. 

Wester K, Wahlund E, Sundstrom G, et al. Paraffin section storage and immunohistochemistry. Appl Immunohistochem Mol Morphol. 2000 8 61. 

A module of the CHEM-X modelling system (see modelling section). Storage and retrieval of two- and three-dimensional structures with substructure-search capability. Available databases include Chapman Hall Dictionary of Drugs (15,000 compounds). Chapman Hall Dictionary of Fine Chemicals (120,000 small organics). Chapman Hall Dictionary of Natural Products (54,000), Derwent Standard Drug File (31,000 biologically active compounds), ChemReact (370,000 reaction types) and others. 

Evaluation of the fixed angle reactive cross section Storage of the quantities needed for off line integration END of the energy-loop... 

Also described in this section are the labeled common storage bloc)cs associated with the thermodynamic subroutines. 

The system should support all the inspection types available in the PSP-3 P-scan, T-scan and Through Transmission, TOFD and A-scan. It should be possible to record data for all the inspection types simultaneously. The developments in computer hardware, in particular disk storage, during the last years have made it feasable to increase the emphasis on the A-scan recording modes. It has also been feasible to extend the P-scan format to include P-scan image storage in a full 3D format, that allows cross-section views to be generated off-line. 

Structure databases are databases that contain information on chemical structures and compounds. The compounds or structure diagrams are not stored as graphics but are represented as connection tables (see Section 2.4). The information about the structure includes the topological arrangement of atoms and the connection between these atoms. This strategy of storage is different from text files and allows one to search chemical structures in several ways. 

IXDCf is faster than MINDO/3, MNDO, AMI, and PM3 and, unlike C XDO, can deal with spin effects. It is a particularly appealing choice for UHF calculations on open-shell molecules. It is also available for mixed mode calculations (see the previous section ). IXDO shares the speed and storage advantages of C XDO and is also more accurate. Although it is preferred for numerical results, it loses some of the simplicity and inierpretability of C XDO. 

We conclude this section by noting an extreme case of chain transfer, a reaction which produces radicals of such low reactivity that polymerization is effectively suppressed. Reagents that accomplish this are added to commercial monomers to prevent their premature polymerization during storage. These substances are called either retarders or inhibitors, depending on the degree of protection they afford. Such chemicals must be removed from monomers prior to use, and failure to achieve complete purification can considerably affect the polymerization reaction. 

Work on EXAFS then progressed very little until the advent of the synchrotron radiation source (storage ring), described in Section 8.1.1.1. This type of source produces X-ray radiation of the order of 10 to 10 times as intense as that of a conventional source and is continuously tunable. These properties led to the establishment of EXAFS as an important structural tool for solid materials. 

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