expression

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expression

1. communication of emotion through music, painting, etc.
2. Maths a variable, function, or some combination of constants, variables, or functions
3. Genetics the effect of a particular gene on the phenotype

expression

[ik′spresh·ən]
(chemical engineering)
Separation of liquid from a two-phase solid-liquid system by compression under conditions that permit liquid to escape while the solid is retained between the compressing surfaces. Also known as mechanical expression.
(computer science)
A mathematical or logical statement written in a source language, consisting of a collection of operands connected by operations in a logical manner.

expression

(programming)
Any piece of program code in a high-level language which, when (if) its execution terminates, returns a value. In most programming languages, expressions consist of constants, variables, operators, functions, and parentheses. The operators and functions may be built-in or user defined. Languages differ on how expressions of different types may be combined - with some combination of explicit casts and implicit coercions.

The syntax of expressions generally follows conventional mathematical notation, though some languages such as Lisp or Forth have their own idiosyncratic syntax.

expression

(1) See Expression Studio.

(2) In programming, a line of source code that returns a value when executed. An expression can comprise any combination of variables, values, operators and functions. For example, a=b+c and price=2*cost are expressions. The more complicated expression (strlen(text_string)*2) is a C example that uses a string length function and returns a value that is twice the number of characters in the string of text. See regular expression.
References in periodicals archive ?
Differential gene expression patterns of the developing and adult mouse cornea compared to the les and tendon.
Our finding is coincident with previous reports in rice, wheat and chickens, which showed that there was differential gene expression between F1 hybrids and their parents (Cheng et al.
However, examining differential gene expression at each time point in isolation does not take advantage of the study design employed in this experiment, namely, two different doses and three time periods of methapyrilene exposure.
Differential gene expression analysis is a criterion most relevant for most applications in which global changes in transcriptome composition are analyzed.
John Essigmann, a professor of chemistry, toxicology and biological engineering, conducts research on differential gene expression in response to exposure to aflatoxin, a natural DNA-damaging agent that is widespread in the environment.
Introduction to Molecular Systems Biology May 30 - June 3 -- Modeling in Systems Biology May 30 - June 3 -- Microarrays and Differential Gene Expression June 6 - June 10 -- Pharmacogenomics June 13 - June 17 -- Biostatistics, Clustering, and Classification June 20 - June 24 -- Bioinformatics Databases and Biomolecular Networks June 27 - July 1 -- Integrative Biology Research in Philadelphia July 5 - July 8 -- Proteomics July 11 - July 15
Identification of differential gene expression profiles in rat cortical cells exposed to the neuroactive agents trimethylolpropane phosphate and bicuculline.
Thus, evaluation of differential gene expression patterns after 13-week exposures to subchronic halogenated aromatic hydrocarbons (HAHs) may yield important clues about the mechanisms by which these chemicals produce their chronic toxicologic effects, including cancer.
Currently, the research team is using differential gene expression profiling to understand how acetaminophen damages liver cells.
Joint Publication on Differential Gene Expression from Small Number of Tumor Cells --
Licensing of the Annealing Control Primers technology allows Sigma-Aldrich to further develop its product offerings for differential gene expression.
Although not yet a part of clinical chemical practice, analyzing patterns of differential gene expression in tissues such as cancers will likely become a routine method in coming years.

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