The phrase "a second nucleus" is correct and usable in written English.
It can be used in scientific contexts, particularly in biology or physics, to refer to an additional nucleus in a cell or atom.
Example: "In certain types of cells, such as muscle cells, there can be a second nucleus that plays a role in cellular function."
Alternatives: "an additional nucleus" or "a supplementary nucleus".
The group hopes to produce the basis for a quantum computing system by moving the entangled electrons to simultaneously entangle them with a second nucleus.
Each Tetrahymena has a gene for its own sex or mating type in its regular nucleus, but it also carries a second nucleus used only for reproduction.
In 1999, a second nucleus SPF herd (herd 2; 65 breeding sows) was established with gilts from herd 1.
One of the hallmarks of cryptophytes is the remnant of a second nucleus, which originated by the reduction of the cell nucleus of an engulfed phototrophic eukaryote by another eukaryotic cell [ 28].
Thus, in the case of a high mutation rate enabling back-mutations or the evolution of additional transgenomic suppressors, other land plant-specific mechanisms such as a second, nucleus-encoded chloroplast RNA polymerase should ultimately become superfluous and be lost.
In its new home, the cyanobacterium settled down to became a chloroplast, while the red algae's nucleus was whittled down to form a "nucleomorph --something resemblinucleomorph --somethings.
Theorists had known that for vanishingly short instants of time, a trillionth of a trillionth of a second, the nucleus could be filled with hundreds of gluons that then disappear again.
But in that fraction of a second, the nucleus definitely consisted of two alpha particles--with an extra pair of neutrons flying between them like a pair of electrons between two atoms.
Nuclei (n) have been false-colored; second nucleus in (C ) is in a different focal plane.
All the spores were found to be binucleate but the researchers believed that in the monokaryotic strain, the second nucleus had failed to pass through the germ tube.
Recovery of fluorescence in the bleached nucleus was monitored in time and compared to the fluorescence intensity of the second nucleus in the bikaryon.
