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 ?
These studies allow the use of the zebrafish GeneChip(R) (Affymetrix) to study differential gene expression in Tilapia.
A simple implementation of a normal mixture approach to differential gene expression in multiclass microarrays.
Differential gene expression of some lignocellulolytic enzymes in Aspergillus nigerbiofilms
14) Since then, several studies using microarrays were performed to identify differential gene expression in MS tissue as well as in tissues from experimental autoimmune encephalomyelitis (EAE), an animal model of MS.
Differential gene expression analysis between CRC and healthy donors identified a total of 87 genes, including 40 that were differentially upregulated in the cancer group (see Supplementary Fig.
We used a nonparametric algorithm without background subtraction to assess differential gene expression.
9:45 VALIDATION OF DIFFERENTIAL GENE EXPRESSION IN NF1-MUTANT SCHWANN CELLS USING REAL-TIME, QUANTITATIVE RT-PCR.
The differential gene expression approaches described in the first part of this article, as well as other genetic approaches, can provide a set of "candidate" genes that are differentially expressed in the alcoholic brain.
Several independent high-throughput methods for differential gene expression (including SAGE and differential display) may enable function annotation of sequenced genomes (2).
Powerful and continually evolving methods, such as short-read sequencing (RNA-seq), microarray analysis, quantitative real-time RT-PCR, as well as traditional methods for differential gene expression studies using multiplex endpoint PCR and northern blot analysis are employed by scientists to analyze gene function, identify new therapeutic and diagnostic targets, and to map pathways involved in development and disease.

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