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The Entrez logo
The Entrez logo

The Entrez Global Query Cross-Database Search System is a powerful federated search engine, or web portal that allows users to search many discrete health sciences databases at the National Center for Biotechnology Information (NCBI) website. Federated search is the simultaneous search of multiple online databases and is an emerging feature of automated Web-based Library and Information retrieval A web portal is a site that provides a single function via a web page or site Health science is the applied science dealing with Health, and it includes many sub disciplines The National Center for Biotechnology Information ( NCBI) is part of the United States National Library of Medicine (NLM a branch of the National Institutes NCBI is part of the National Library of Medicine (NLM), itself a department of the National Institutes of Health (NIH) of the United States government. The United States National Library of Medicine ( NLM) operated by the United States federal government, is the world's largest Medical library. "NIH" redirects here For other meanings of NIH see NIH (disambiguation. The federal government of the United States is the central United States Governmental body established by the United States Constitution. Entrez also happens to be the French second person plural (or formal) form of the verb "to enter", meaning literally "come in".

Entrez Global Query is an integrated search and retrieval system that provides access to all databases simultaneously with a single query string and user interface. Entrez can efficiently retrieve related sequences, structures, and references. In Biochemistry, the primary structure of a biological molecule is the exact specification of its atomic composition and the chemical bonds connecting those atoms (including In Biochemistry and Chemistry, the tertiary structure of a Protein or any other Macromolecule is its three-dimensional structure as defined The Entrez system can provide views of gene and protein sequences and chromosome maps. History See also History of genetics The existence of genes was first suggested by Gregor Mendel (1822-1884 who in the 1860s studied inheritance Proteins are large Organic compounds made of Amino acids arranged in a linear chain and joined together by Peptide bonds between the Carboxyl A chromosome is an organized structure of DNA and Protein that is found in cells. Some textbooks are also available online through the Entrez system.

Contents

Features

The Entrez front page provides, by default, access to the global query. All databases indexed by Entrez can be searched via a single query string, supporting boolean operators and search term tags to limit parts of the search statement to particular fields. This returns a unified results page, that shows the number of hits for the search in each of the databases, which are also links to actual search results for that particular database.

Entrez also provides a similar interface for searching each particular database and for refining search results. The Limits feature allows the user to narrow a search a web forms interface. The History feature gives a numbered list of recently performed queries. Results of previous queries can be referred to by number and combined via boolean operators. Search results can be saved temporarily in a Clipboard. Users with a MyNCBI account can save queries indefinitely and also choose to have updates with new search results e-mailed for saved queries of most databases. It is widely used in the field of biotechnology to enhance the knowledge of students worldwide.

Databases

Entrez searches the following databases:

Accessing Entrez

In addition to using the search engine forms to query the data in Entrez, NCBI provides the Entrez Programming Utilities (eUtils) for more direct access to query results. The eUtils are accessed by posting specially formed URLs to the NCBI server, and parsing the XML response. There is also an eUtils SOAP interface. SOAP (see below for name and origins is a protocol for exchanging XML -based messages over Computer networks normally using

See also

External links

Databases supported by Bioinformatic Harvester
NCBI-BLAST | CDD | Ensembl | Entrez | Flybase | Flymine | GFP-cDNA | Genome_browser | GeneCard | Google_Scholar | GoPubMed | HomoloGene | iHOP | IPI | OMIM | Mitocheck | PSORT | PolyMeta | UniProt | SOURCE | SOSUI | RZPD | Sciencenet | STRING | SMART | ZFIN |
The Bioinformatic-Harvester is a bioinformatic meta Search engine at KIT Karlsruhe Institute of Technology for Genes and protein-associated information In Bioinformatics, B asic L ocal A lignment S earch T ool or BLAST, is an Algorithm for comparing primary Ensembl is a joint scientific project between the European Bioinformatics Institute and the Wellcome Trust Sanger Institute, which was launched in 1999 in response to the imminent FlyBase is an online Bioinformatics Database of the biology and genome of the Model organism Drosophila melanogaster and related Drosophilid The GFP-cDNA project documents the localisation of Proteins to subcellular compartments of the Eukaryotic cell applying Fluorescence microscopy Biological databases are libraries of life sciences information collected from scientific experiments published literature high throughput experiment technology and computational analyses Google Scholar ( GS) is a freely-accessible Web search engine that indexes the full text of Scholarly literature across an array of publishing formats GoPubMed is a knowledge-based search engine for biomedical texts HomoloGene, a tool of the National Center for Biotechnology Information (NCBI is a system for automated detection of homologs (similarity attributable to descent Information Hyperlinked over Proteins (or iHOP) is an online service that provides a gene-guided network to access PubMed abstracts The Mendelian Inheritance in Man project is a Database that catalogues all the known Diseases with a genetic component, and—when possible—links them MitoCheck is an integrated research project which brings together leading European research groups to study systematically the regulation of Mitosis in Human PSORT is a Bioinformatics tool available online at http//psort UniProt is the uni versal prot ein resource a central repository of Protein data created by combining Swiss-Prot, TrEMBL SOSUI is a free online tool that predicts a part of the Secondary structure of proteins from a given Amino acid sequence (AAS "Sciencenet" is an experimental search engine at KIT ( Karlsruhe Institute of Technology - Liebel-Lab for scientific knowledge The Zebrafish Information Network ( ZFIN is an online Biological database of information about the Zebrafish ( Danio rerio)
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