The phrase "and in the presence of a" is correct and usable in written English.
It can be used in contexts where you are referring to an event or situation that occurs while someone or something is present.
Example: "The agreement was signed and in the presence of a notary public, ensuring its validity."
Alternatives: "in the company of a" or "in the sight of a".
Married women will be allowed to use them only indoors and in the presence of a relative.
When cells experience nitrogen starvation and in the presence of a poor carbon source, diploid yeast cells undergo meiosis and package the resulting haploid nuclei into spores.
On July 30 , 1965 Lyndon Johnson flew to Independence, Mo., and in the presence of a smiling Harry Truman, signed the bill that created Medicare.
They were then tested in the original acquisition context and in the presence of a retrieval cue.
Polymer samples containing various amounts of oxygen were extruded without stabilizer and in the presence of a hindered phenolic antioxidant.
This increase in the concentration of deoxyribonucleic acid was most profound among the nulliparous patients after a successful version and in the presence of a posterior placenta.
The expected aromatic amines forming azo colorants were detected, and in the presence of a nitro group a further reduction was observed.
The dilatation was significantly less in endothelium-denuded arterioles or after pretreatment with and in the presence of a nitric oxide synthase inhibitor.
This paper reports molecular dynamics simulations of the magnetite (001 -water interface, both in pure water and in the presence of a 2.3 molal solution of NaClO4.
The effect was strongest at the highest crossflow velocity (0.2 m s−1) and in the presence of a feed spacer.
The effect of the stabilization was then tested against high temperatures and in the presence of a biomass-dissolving ionic liquid, 1-ethyl-3-methylimidazolium acetate ([emim]OAc).
