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The main academic full-text databases are open archives or link-resolution services, although others operate under different models such as mirroring or hybrid publishers. . Such services typically provide access to full text and full-text search, but also metadata about items for which no full text is availa
Dextroamphetamine (INN:dexamfetamine) is a potent central nervous system (CNS) stimulant and enantiomer [note 1] of amphetamine that is prescribed for the treatment of attention deficit hyperactivity disorder (ADHD) and narcolepsy.
They are round or oval, and range from a width of 1.5 to 3 inches (3.8 to 7.6 centimetres). The fruits have a juicy edible center composed of a large number of seeds . This photograph shows two passion fruits of the species Passiflora ligularis (also known as the sweet granadilla), one whole and one halved.
Full-text search. In text retrieval, full-text search refers to techniques for searching a single computer -stored document or a collection in a full-text database. Full-text search is distinguished from searches based on metadata or on parts of the original texts represented in databases (such as titles, abstracts, selected sections, or ...
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Elasticsearch is a search engine based on the Lucene library. It provides a distributed, multitenant -capable full-text search engine with an HTTP web interface and schema-free JSON documents. Elasticsearch is developed in Java and is triple-licensed under the (source-available) Server Side Public License, the Elastic license, and the Affero ...
Users can also access the collection through commercial database vendors, statewide and institutional networks, and Internet search engines. To help users find the information they are seeking, ERIC produces a controlled vocabulary, the Thesaurus of ERIC Descriptors. This is a carefully selected list of education-related words and phrases used ...
PubChem can be accessed for free through a web user interface. Millions of compound structures and descriptive datasets can be freely downloaded via FTP. PubChem contains multiple substance descriptions and small molecules with fewer than 100 atoms and 1,000 bonds. More than 80 database vendors contribute to the growing PubChem database. [2]