A residue, broadly, is anything left behind by a reaction or event. A chemical reaction is a process that results in the interconversion of chemical substances [1]. The substance or substances initially involved in a chemical reaction are called reactants. ... An event is something that takes place; an occurrence and arbitrary point in time. ...

In complex analysis, the residue is a complex number which describes the behavior of path integrals of a meromorphic function around a singularity. Complex analysis is the branch of mathematics investigating functions of complex numbers. ... In complex analysis, the residue is a complex number which describes the behavior of path integrals of a meromorphic function around a singularity. ... Wikibooks Algebra has more about this subject: Complex numbers In mathematics, a complex number is an expression of the form a + bi, where a and b are real numbers, and i stands for the square root of negative one (−1), which cannot be represented by any real number. ... In mathematics, a path integral (also known as a line integral) is an integral where the function to be integrated is evaluated along a path or curve. ... In complex analysis, a meromorphic function on an open subset D of the complex plane is a function that is holomorphic on all D except a set of isolated points, which are poles fore the function. ... In mathematics, a singularity is in general a point at which a given mathematical object is not defined, or a point of an exceptional set where it fails to be well-behaved in some particular way, such as differentiability. ...

In modular arithmetic, the residue of an integer n to base b is the remainder r after the largest multiple mb of b no greater than n has been subtracted from n (if n < 0, one adds multiples of b just sufficient to make the result non-negative). The residues modulo (to the base) b form a ring. Modular arithmetic is a system of arithmetic for integers, where numbers wrap around after they reach a certain value — the modulus. ... In mathematics, a ring is an algebraic structure in which addition and multiplication are defined and have similar (but not identical) properties to those familiar from the integers. ...

In chemistry, a residue refers to a portion of a larger molecule, for example in biochemistry and molecular biology, a residue refers to a specific monomer of a polysaccharide, protein or nucleic acid. For example one might say: "the histidine residue is considered to be basic due to its imidazole ring". Note that a residue is different from a moiety, which, in the above example would consistute the imidazole ring or "the imidazole moiety". Chemistry (derived from the Arabic word kimia, alchemy, where al is Arabic for the) is the science that deals with the properties of organic and inorganic substances and their interactions with other organic and inorganic substances. ... In general, a molecule is the smallest particle of a pure chemical substance that still retains its composition and chemical properties. ... Biochemistry is the study of the chemistry of life, a bridge between biology and chemistry that studies how complex chemical reactions give rise to life. ... Molecular biology is the study of biology at a molecular level. ... In chemistry, a monomer (from Greek mono one and meros part) is a small molecule that may become chemically bonded to other monomers to form a polymer. ... Polysaccharides (sometimes called glycans) are relatively complex carbohydrates. ... A representation of the 3D structure of myoglobin, showing coloured alpha helices. ... Schematic diagram of a double-stranded nucleic acid. ... Look up moiety on Wiktionary, the free dictionary. ...