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The main objective of database modelling is the design of a database that is correct and can be processed efficiently by a database management system. The efficiency and correctness of a database depends among other things on knowledge about database semantics because semantic constraints are the prerequisite for normalization and restructuring operations. Acquisition of semantic constraints remains...
This paper presents an approach to support the design of ‘dynamic’ databases. The basis of our approach is formed by schemata of an extended entity-relationship model which are constructed in a modular way and can then be enriched by behavior specifications, functions, and view definitions. The goal is to derive the retrieval and update semantics from a given data schema as far as possible, such that...
Immunohistological analysis of tissue sections from human brain revealed that intercellular adhesion molecule-1 (ICAM-1) is mainly expressed on endothelial cells of small vessels, including the subependymal vessels of the choroid plexus. In addition, it is expressed on cerebrospinal fluid (CSF) cells in patients with inflammatory diseases of the central nervous system. Stimulation of confluent monolayers...
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