The present invention relates to improved covalent coupling of two or more entities such as biomolecules, polymer compositions, organicinorganic moleculesmaterials, and the like, including their combinations, through one or more novel reactive groups attached to linker groups of 2-1000 atoms length. Provided by the invention are the seeds, plants and derivatives of the soybean variety D5232589. The combustion control system provides active feedback control of the combustion event and includes a sensor, e. The linkage member is connected to the actuator such that the first pin is received in the first channel and the second pin is received in the second channel.