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Data obtained from the scientific experiments are heterogeneous and distributed. They are stored in different file formats so it is difficult to be integrated, analyzed, processed and visualised. Scientific experiments require effective and efficient data management. In this paper an approach to convert raw data obtained from scientific experiments into relational database using XML based description is proposed. The approach is tested and verified by database and web service implementations. The implemented web service provides authorized access to the experimental data. In order to provide a secure data transmission and data access the database is encrypted through an asymmetric 128-bit encrypting method implementation based on public and private key. A number of experiments using specific scientific data obtained from various experimental instruments are conducted to illustrate the usage of the proposed approach.