The Chemical Abstracts Service Chemical Registry System. VI. Substance-Related Statistics

Stobaugh, Robert E.

doi:10.1021/ci60022a005

Cited by 15 publications

(9 citation statements)

References 2 publications

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“…Common ones are the Chemical Abstracts Service (CAS) connection table used in the REGISTRY system [3][4][5][6][7][8][9][10][11][12][13][14][15]; molfile, SDfile and other file standards developed by MDL, now Symyx [16,17]; the International Union of Pure and Applied Chemistry (IU-PAC) International Chemical Identifier, InChI [18]; and SMILES, developed by Daylight Chemical Information Systems [19,20].…”

Section: Chemical Structure Representationmentioning

confidence: 99%

Tautomerism in chemical information management systems

Warr¹

2010

J Comput Aided Mol Des

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Tautomerism has an impact on many of the processes in chemical information management systems including novelty checking during registration into chemical structure databases; storage of structures; exact and substructure searching in chemical structure databases; and depiction of structures retrieved by a search. The approaches taken by 27 different software vendors and database producers are compared. It is hoped that this comparison will act as a discussion document that could ultimately improve databases and software for researchers in the future.

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Section: Chemical Structure Representationmentioning

confidence: 99%

Tautomerism in chemical information management systems

Warr¹

2010

J Comput Aided Mol Des

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“…A measure of the relative importance of different elements in pure chemistry is the relative numbers of compounds formed by them. Approximate values for these can be obtained from Chemical Abstracts Service (CAS) statistics (12). The values are approximate because the CAS includes unknown species on which theoretical calculations have been carried out (e.g., Ar04).…”

Section: Chemical Importancementioning

confidence: 99%

“…The CAS also publishes statistics for the number of atoms of each element in the formulas of all the species in its register (12). These make hydrogen, carbon, and oxygen the most important elements; nitrogen, sulfur, chlorine, and fluorine, the next most important.…”

Section: Chemical Importancementioning

confidence: 99%

Important elements

Nelson¹

1991

J. Chem. Educ.

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Which chemical elements are most important? In intmductory chemistry, which elements should be studied? In advanced courses, which elements should receive most attention? I hope to answer these questions in this paper.The importance of an element is, of course, relative, depending entirely on thecontext in which it is assessed. An element that is very important from one point of view may be quite unimportant from another. Moreover, the value of anelement, inone context, is somewhat subjective, depending on your criterion.I will trv to reduce the effects of relativitv and subiectivitv by considering the elements in a variety i f context; and b; . seeking rational measures of their relative im~ortance. I -then merge the results for the different contexts to rank the clementsin orderofimoonanceoverall. Whileconsiderable subjectivity remains the final list, I hope that it will nevertheless be useful to educators and instructors in deciding how to divide attention among different elements.Natural Importance For people, the most important parts of the universe are the earth and the sun, which supplies the earth with energy.

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“…At the onset of this work, several systems to translate printed characters into computer-readable form by optical character recognition were on the market. The Special special Handling (6) .1…”

Section: Molecular Formula: C16h14mentioning

confidence: 99%

Chemical Abstracts Service Chemical Registry System. 10. Registration of substances from pre-1965 indexes of Chemical Abstracts

Hamill¹,

Nelson²,

Stouw³

et al. 1988

J. Chem. Inf. Comput. Sci.

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The Chemical Abstracts Service Chemical Registry System, operating since 1965, uniquely identifies chemical substances on the basis of molecular structure. Chemical Abstracts Service is now registering chemical substances cited in indexes to Chemical Abstracts prior to 1965. This effort will result in several hundred thousand additional chemical structures, along with their names, being available for online searching in the Registry File. Both the newly registered substances and those already on file are being linked to their pre-1965 citations in Chemical Abstracts in a new file called CAOLD. In this effort the printed Formula Index entries are converted to computer-readable form by using optical character recognition with the data subsequently processed with existing computer programs.

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The Chemical Abstracts Service Chemical Registry System. VI. Substance-Related Statistics

Cited by 15 publications

References 2 publications

Tautomerism in chemical information management systems

Tautomerism in chemical information management systems

Important elements

Chemical Abstracts Service Chemical Registry System. 10. Registration of substances from pre-1965 indexes of Chemical Abstracts

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