reaction step
81Varrentrapp reaction — The Varrentrapp reaction is an organic reaction involving the chemical decomposition of an α,β unsaturated acid into two other acid fragments by action of molten alkali. This reaction pioneered by F. Varrentrapp in 1840 [F. Varrentrapp, Ann., 36 …
82Photochemical reaction — A photochemical reaction is a chemical reaction which is induced by light. Examples of photochemical organic reactions are electrocyclic reactions, photoisomerization and Norrish reactions. The basic requirements for photochemical reactions are:… …
83Digital polymerase chain reaction — (digital PCR, DigitalPCR, dPCR, or dePCR) is a refinement of conventional polymerase chain reaction methods that can be used to directly quantify and clonally amplify nucleic acids including DNA, cDNA or RNA. The key difference between dPCR and… …
84Hydration reaction — In organic chemistry, a hydration reaction is a chemical reaction in which a hydroxyl group (OH ) and a hydrogen cation (an acidic proton) are added to the two carbon atoms bonded together in the carbon carbon double bond which makes up an alkene …
85Lehmstedt-Tanasescu reaction — The Lehmstedt Tanasescu reaction is a method in organic chemistry for the organic synthesis of acridone derivatives (3) from a 2 nitrobenzaldehyde (1) and an arene compound (2): [S Yoshida. Design, Synthesis and Characterization of Novel… …
86Haber-Weiss reaction — The Haber Weiss reaction generates •OH (hydroxyl radicals) from H2O2 (hydrogen peroxide) and superoxide (•O2 ). This reaction can occur in cells and is therefore a possible source for oxidative stress. The reaction is very slow, but is catalyzed… …
87polymerase chain reaction — n. a technique in which a known DNA sequence is synthesized at high temperatures by means of a polymerase, producing millions of copies for statistical analysis: used in DNA fingerprinting, in detecting minute quantities of cancer cells, etc. * * …
88Concrete step barrier — A concrete step barrier is a safety barrier used on the central reservation of motorways and dual carriageways as an alternative to the standard steel crash barrier. Concrete step barrier cross section The barrier has contained all vehicles up to …
89Twelve-step program — ] As summarized by the American Psychological Association, the process involves the following: * admitting that one cannot control one s addiction or compulsion; * recognizing a greater power that can give strength; * examining past errors with… …
90Product-determining step — The product determining step is the step of a chemical reaction that determines the ratio of products formed via differing reaction mechanisms that start from the same reactants. The product determining step is not rate limiting if the rate… …
