Was (wer) ist S-expression - definition
S-expression
DATA SERIALIZATION FORMAT OFTEN USED FOR LISP
S expression; S-expressions; Sexp; S-exp; S expressions; S-Expression; Sexps; Lisp syntax; Sexpr; S-expr
In computer programming, an S-expression (or symbolic expression, abbreviated as sexpr or sexp) is an expression in a like-named notation for nested list (tree-structured) data. S-expressions were invented for and popularized by the programming language Lisp, which uses them for source code as well as data.
Expression (mathematics)
FORMULA THAT REPRESENTS A MATHEMATICAL OBJECT
Mathematical expression; Expression (math); Compound expression; Algebraical quantity; Arithmetic expression; Finite expression; Mathematical expressions; Numeric expression
In mathematics, an expression or mathematical expression is a finite combination of symbols that is well-formed according to rules that depend on the context. Mathematical symbols can designate numbers (constants), variables, operations, functions, brackets, punctuation, and grouping to help determine order of operations and other aspects of logical syntax.
Gene expression
![DNA methylation is the addition of a [[methyl]] group to the DNA that happens at [[cytosine]]. The image shows a cytosine single ring base and a methyl group added on to the 5 carbon. In mammals, DNA methylation occurs almost exclusively at a cytosine that is followed by a [[guanine]].](https://commons.wikimedia.org/wiki/Special:FilePath/DNA methylation.svg?width=200 "DNA methylation is the addition of a [[methyl]] group to the DNA that happens at [[cytosine]]. The image shows a cytosine single ring base and a methyl group added on to the 5 carbon. In mammals, DNA methylation occurs almost exclusively at a cytosine that is followed by a [[guanine]].")
![hunchback]]. High intensity of blue color marks places with high hunchback mRNA quantity.](https://commons.wikimedia.org/wiki/Special:FilePath/Hunchback in situ.jpg?width=200 "hunchback]]. High intensity of blue color marks places with high hunchback mRNA quantity.")
![[[Neomycin]] is an example of a small molecule that reduces expression of all protein genes inevitably leading to cell death; it thus acts as an [[antibiotic]].](https://commons.wikimedia.org/wiki/Special:FilePath/Neomycin B C.svg?width=200 "[[Neomycin]] is an example of a small molecule that reduces expression of all protein genes inevitably leading to cell death; it thus acts as an [[antibiotic]].")
![transcription start site]] of the gene. The loop is stabilized by one architectural protein anchored to the enhancer and one anchored to the promoter and these proteins are joined to form a dimer (red zigzags). Specific regulatory [[transcription factor]]s bind to DNA sequence motifs on the enhancer. General transcription factors bind to the promoter. When a transcription factor is activated by a signal (here indicated as [[phosphorylation]] shown by a small red star on a transcription factor on the enhancer) the enhancer is activated and can now activate its target promoter. The active enhancer is transcribed on each strand of DNA in opposite directions by bound RNAP IIs. Mediator (a complex consisting of about 26 proteins in an interacting structure) communicates regulatory signals from the enhancer DNA-bound transcription factors to the promoter.](https://commons.wikimedia.org/wiki/Special:FilePath/Regulation of transcription in mammals.jpg?width=200 "transcription start site]] of the gene. The loop is stabilized by one architectural protein anchored to the enhancer and one anchored to the promoter and these proteins are joined to form a dimer (red zigzags). Specific regulatory [[transcription factor]]s bind to DNA sequence motifs on the enhancer. General transcription factors bind to the promoter. When a transcription factor is activated by a signal (here indicated as [[phosphorylation]] shown by a small red star on a transcription factor on the enhancer) the enhancer is activated and can now activate its target promoter. The active enhancer is transcribed on each strand of DNA in opposite directions by bound RNAP IIs. Mediator (a complex consisting of about 26 proteins in an interacting structure) communicates regulatory signals from the enhancer DNA-bound transcription factors to the promoter.")
![pigmentation]] genes in different areas of the [[skin]].](https://commons.wikimedia.org/wiki/Special:FilePath/Tortie-flame.jpg?width=200 "pigmentation]] genes in different areas of the [[skin]].")
CONVERSION OF A GENE'S SEQUENCE INTO A MATURE GENE PRODUCT OR PRODUCTS
Expressed genes; Inducible gene; Expression of genes; Expression (genetics); Constitutive gene; Facultative gene; Attenuation of transcription; Expression system; Gene Expression; Stochastic gene expression; Household gene; The effect of the environment on the expression of a gen; Expression systems; Genetic expression; Constitutive enzyme; Receptor expression; Gene expression analysis; Constitutive protein; RNA expression; Genome expression; Constitutive expression; Constitutively expressed
Gene expression is the process by which information from a gene is used in the synthesis of a functional gene product that enables it to produce end products, protein or non-coding RNA, and ultimately affect a phenotype, as the final effect. These products are often proteins, but in non-protein-coding genes such as transfer RNA (tRNA) and small nuclear RNA (snRNA), the product is a functional non-coding RNA.
