A subduction zone is also generated when two oceanic plates collide â the older plate is forced under the younger one â and it leads to the formation of chains of volcanic islands known as island arcs. Examples include the Mariana Islands in the western Pacific Ocean and the Aleutian Islands, off the coast of Alaska.
Gabriel Synthesis. Gabriel Synthesis is an organic chemical reaction in which primary alkyl halides are transformed into primary amines using potassium phthalimide. This reaction is named after a German chemist Siegmund Gabriel.Pure primary aliphatic amines are prepared from alkyl halides by this method.abriel Synthesis. Gabriel Synthesis is an organic chemical reaction in which primary alkyl halides are transformed into primary amines using potassium phthalimide. This reaction is named after a German chemist Siegmund Gabriel.
Dark reaction. Definition. noun. The series of biochemical reactions in photosynthesis that do not require light to proceed, and ultimately produce organic molecules from carbon dioxide. Supplement. The energy from ATP (produced during the light reactions) drives the dark reactions of photosynthesis. The term dark reactions does not mean the reactions happen at night or that they require darkness. It means that the reactions can proceed regardless of the amount of light available. The term is only used to identify the dark reactions with the light reactions, which obviously require light. Synonym: