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The electron transport chain (ETC; respiratory chain) is a series of protein complexes that transfer electrons from electron donors to electron acceptors via redox reactions (both reduction and oxidation occurring simultaneously) and couples this electron transfer with the transfer of protons (H+ ions) across a membrane. The electron transport chain is built up of peptides, enzymes, and other molecules.

The flow of electrons through the electron transport chain is an exergonic process. The energy from the redox reactions creates an electrochemical proton gradient that drives the synthesis of adenosine triphosphate (ATP). In aerobic respiration, the flow of electrons terminates with molecular oxygen being the final electron acceptor. In anaerobic respiration, other electron acceptors are used, such as sulfate.

In the electron transport chain, the redox reactions are driven by the difference in the Gibbs free energy of reactants and products. The Gibbs free energy can be related to a quantity called the redox potential. The complexes in the electron transport chain harvest the energy of the redox reactions that occur when high-energy reactants convert to lower energy products and electrons are transferred from a lower redox potential to a higher redox potential, by creating an electrochemical gradient of ions. It is this electrochemical gradient that drives the synthesis of ATP via coupling with oxidative phosphorylation with ATP synthase.

In eukaryotic organisms the electron transport chain, and site of oxidative phosphorylation, is found on the inner mitochondrial membrane. The energy released by the reaction of oxygen with reduced compounds such as cytochrome c and (indirectly) NADH and FADH is used by the electron transport chain to pump protons into the intermembrane space, generating the electrochemical gradient over the inner mitochondrial membrane. In photosynthetic eukaryotes, the electron transport chain is found on the thylakoid membrane. Here, light energy drives the reduction of components of the electron transport chain and therefore causes subsequent synthesis of ATP. In bacteria, the electron transport chain can vary over species but it always constitutes a set of redox reactions that are coupled to the synthesis of ATP, through the generation of an electrochemical gradient, and oxidative phosphorylation through ATP synthase.

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The KTM ETS (commercially known as ETS, short for 'Electric Train Service') is an inter-city rail passenger service operated by Keretapi Tanah Melayu (KTM) using electric multiple-unit (EMU) trains. The KTM ETS is the second electric train service to be operated by the Malaysian railway company, after the KTM Komuter service, and the second inter-city rail service, after KTM Intercity.

The ETS is the fastest metre-gauge train service in Malaysia and operates along the electrified and double-tracked stretch of the West Coast Line between Gemas and Padang Besar in Peninsular Malaysia, which was previously served by KTM Intercity.

The rail service is currently operated by KTM Intercity Division. It was previously operated by ETS Sendirian Berhad, a fully owned subsidiary of Keretapi Tanah Melayu Berhad.

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Ei Compendex is an engineering bibliographic database published by Elsevier.The name "Compendex" stands for COMPuterized ENgineering inDEX. It covers scientific literature pertaining to engineering materials. It started in 1884 under the name Engineering Index (Ei) and its first electronic bulletin was issued in 1967.Elsevier purchased the parent company Engineering Information in 1998.

The Electric Image Animation System (EIAS) is a 3D computer graphics package published by EIAS3D. It currently runs on the macOS and Windows platforms.

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