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  2. Exogenous and endogenous variables - Wikipedia

    en.wikipedia.org/wiki/Exogenous_and_endogenous...

    An endogenous change is a change in an endogenous variable in response to an exogenous change that is imposed upon the model. [ 1 ] : p. 8 [ 3 ] : p. 8 The term ' endogeneity ' in econometrics has a related but distinct meaning.

  3. Ligand - Wikipedia

    en.wikipedia.org/wiki/Ligand

    In coordination chemistry, a ligand [a] is an ion or molecule with a functional group that binds to a central metal atom to form a coordination complex. The bonding with the metal generally involves formal donation of one or more of the ligand's electron pairs , often through Lewis bases . [ 1 ]

  4. Metabolomics - Wikipedia

    en.wikipedia.org/wiki/Metabolomics

    The version 3.5 of the HMDB contains >16,000 endogenous metabolites, >1,500 drugs and >22,000 food constituents or food metabolites. [32] This information, available at the Human Metabolome Database and based on analysis of information available in the current scientific literature, is far from complete. [ 33 ]

  5. Control function (econometrics) - Wikipedia

    en.wikipedia.org/wiki/Control_function...

    The function h(V) is effectively the control function that models the endogeneity and where this econometric approach lends its name from. [4]In a Rubin causal model potential outcomes framework, where Y 1 is the outcome variable of people for who the participation indicator D equals 1, the control function approach leads to the following model

  6. Bioorthogonal chemistry - Wikipedia

    en.wikipedia.org/wiki/Bioorthogonal_chemistry

    Copper-free click chemistry is a bioorthogonal reaction first developed by Carolyn Bertozzi as an activated variant of an azide alkyne Huisgen cycloaddition, based on the work by Karl Barry Sharpless et al. Unlike CuAAC, Cu-free click chemistry has been modified to be bioorthogonal by eliminating a cytotoxic copper catalyst, allowing reaction ...

  7. Endogeny (biology) - Wikipedia

    en.wikipedia.org/wiki/Endogeny_(biology)

    For example, endogenous substances, and endogenous processes are those that originate within a living system (e.g. an organism or a cell). For instance, estradiol is an endogenous estrogen hormone produced within the body, whereas ethinylestradiol is an exogenous synthetic estrogen, commonly used in birth control pills .

  8. Endogenous money - Wikipedia

    en.wikipedia.org/wiki/Endogenous_money

    Endogenous money is a heterodox economic theory with several strands, mostly associated with the post-Keynesian school, as well as some sectors of the Austrian school. Multiple theory branches developed separately and are to some extent compatible (emphasizing different aspects of money), while remaining united in opposition to the New ...

  9. Glossary of chemistry terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_chemistry_terms

    Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...