specific search
2.Design and implementation of pipeline topic-specific search engine based on improved PageRank algorithm
8.Four categories are provided, and the emphasis may be more sensitive or more specific. The PubMed connects with the Entrez retrieval system through the New Global NCBI Search Engine. It is able to search across databases including PubMed Cental, Nucleotide, Protein, Structure, Complete Genomes, Taxonomy, OMIM, MEDLINE, etc.

