The phrase "a nucleus which is" is correct and usable in written English.
It can be used when describing a nucleus in a scientific context, particularly in biology or physics, to provide additional information about its characteristics or functions.
Example: "The cell contains a nucleus which is responsible for storing genetic material."
Alternatives: "a nucleus that is" or "a nucleus which serves as".
Since 1911 it has been known that a complex atom may be thought of as a swarm of light, negatively charged electrons surrounding a nucleus which is about 50,000 times smaller than the atom itself.
The numerical results show that, a nucleus which is smaller than a critical size, even after the application of a sufficiently large overpotential, always starts to grow under kinetic control.
Oxidation of hydrogen removes its electron and gives H+, which contains no electrons and a nucleus which is usually composed of one proton.
Mature WAs contain a single lipid droplet ('unilocular'), few mitochondria, and a nucleus which is displaced to the cytoplasmic periphery.
The P NMR spectrum reveals a characteristic AA′MOXX′-spin system for the isotopomer without a Se nucleus which is superimposed by the respective AA′MOXX′Z-spin system of the Se containing species.
The MIC is a germline nucleus, which is used for sexual reproduction; gene expression in the MIC is kept inactive in all life cycle stages.
In effect, chromatin becomes transcriptionally silent and tightly packaged into a sperm nucleus, which is reduced in volume more than 20 times [ 51].
In contrast to other non-steroidal anti-inflammatory drugs (NSAIDs), indomethacin has an indole nucleus which is similar to serotonin and to the 5HT1B/1D agonists known as triptans.
Thus, these proteins share an obligate nucleus, which is required to set up the correct topology of these complex Greek-key domains and allow folding to proceed.
Strangest of all, it ought to be able to spit out a bound packet of two protons--essentially a helium-2 nucleus, which is never spotted in nature.
Under the green filter, an intact green nucleus, which is comparable to the control, indicates a viable cell, whereas a green fragmented nucleus indicates early apoptosis.
