Library classification systems

U.S. Patent and Trademark Office Web Patent Databases. The Patent and Trademark Office (PTO) [72] offers free World Wide Web access, http // www.uspto.gov/main/patents.htm, to a bibliographic patent database that uses the most current patent classification system, this may not match the classification data that appears on the printed patent, and to a full-text patent database that uses the classification data that appear on the printed patent, this may not match the current classification data. The databases start with January 1, 1976, patents. The full text of a patent includes all bibliographical data (e.g., inventor s name, the patent s title, the assignee s name, etc.) and the abstract, full description of the invention, and the claims. All the words in the text of the patent are searchable. If the patent number is known, the patent, regardless of year, can be ordered from the PTO. Automated searching of 1971 to date patents is available at some of the Patent and Trademark Depository Libraries. Prior to 1971 searching can be done at the PTO facilities or at the Patent and Trademark Depository Libraries. Commercial patent search services are also available. 

Finally, the 3D-LogP descriptor may be used for the 3D screening of virtual molecular conformation libraries wherein the selection of candidate molecules might not only be driven by pharmacophoric but also by physicochemical constraints. Similarly, we anticipate that the 3D-LogP descriptor will also become useful for the design of chemical libraries in which the description of the conformational space is taken into account in the description of the constituent molecules. We are currently enhancing the descriptor by implementing the last atom type classification system proposed by Wildman and Crippen (54). 

There is a large number of naturally occurring lipids but not all are available commercially. The Lipid Library is a useful source of general information on most classes of lipids, fatty acids and eicosanoids. In addition to this, a more specific database, the Lipid Metabolites and Pathways Strategy (LipidMAPS), provides a classification system for all known lipids and gives information on the structures of these lipids. 

Apphcation of the similarity index provides a classification of the references by separating these in two classes compounds that may be and compounds that cannot be the same as the unknown. In terms of hypothesis testing, this is equivalent to acceptance or rejection of the null hypothesis that the unknown and the reference compound are identical. A library search system based on this principle should retrieve all references of the may be class, i.e., all references with a similarity index exceeding a predefined threshold value, rather than the 5 or 10 best matches (which may also be very bad matches). 

Users accustomed to the common notations will find these in the subject index. By consulting this index, use of the classification system may be avoided. It is thought that the volumes should be kept close at hand. The books should provide a quick survey, and obviate the immediate need for an elaborate library search. Syntheses are therefore... 

Additional application of chemical knowledge to the selection of features or to the classifier construction has improved the classification results C1933. A comparison between pattern recognition methods and a sophisticated interpretative library search system for mass spectra ( STIRS C39, 4221) has indicated some superiority of the STIRS-system C172, 202, 3321. A decision tree pattern recognition was recommended by Neisel et. al. C2051 as a supplement to library search. 

Since most academic libraries arrange their resonrces nsing the Library of Congress classification system, the major divisions are as follows ... 

The Library of Congress classification system is the most widely nsed system in North America. It is advisable that readers in other countries follow the classification and subject heading guidelines of their native system. 

The Library of Congress classification system used in most academic libraries places the core of materials science literature in the TA400s, but many other Ts as well as QC QD call numbers are also relevant ... 

The Library of Congress Classification System includes anumber of locations within its schedules for petroleum engineering and petroleum refining. The main classification ranges include the following ... 

The Library of Congress classification system places most transportation engineering-related information in the T schedule and a few topics in the H schedule ... 

Whichever classification system is in use in any given library, its purpose is to bring together on the shelves books on the same subject and in so doing to show their relationship to other material in the same and kindred fields. This is achieved by giving each subject a symbol or notation, usually consisting of a number or series of letters, which also serves as an indication of thdr location. 

R Grieco et al., A new classification system for the actions of IRS chemicals traditionaUy used for malaria control. Public Library of Science One, 8, e716, 2007. 

There are two ways to find components in the standard component library (Figures 11 and 12). The first way uses the classification system, while the second links the page directly to the needed components. 

ChemIDplus. Published by the U.S. National Library of Medicine, ChemIDplus [62] is a web-based search system, http //chem.sis.nlm.nih.gov/ chemidplus/, that provides free access to structure and nomenclature authority files used for the identification of chemical substances cited in National Library of Medicine (NLM) databases. ChemIDplus also provides structure searching and direct links to biomedical resources at NLM and on the Internet. The database contains over 349,000 chemical records, over 56,000 of which include chemical structures, and is searchable by name, synonym, CAS registry number, molecular formula, classification code, locator code, and structure. 

---