Nonmelanoma skin cancer
Skin cancer that does not involve melanocytes. Basal cell cancer and squamous cell cancer are examples of nonmelanoma skin cancers.
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- Nonoxynol
Nonoxynol-9 is the most commonly encountered spermatocide in the United States. As with other spermatocides, it destroys spermatozoa; it kills sperm. The nonoxynols, technically speaking, are nonionic surfactant [surface active] mixtures that vary in the number of repeating ethoxy groups. They are much used as detergents, emulsifiers, wetting and defoaming agents, etc. Nonoxynol-9 has 9 […]
- Nonpathogenic
Incapable of causing disease. For example, nonpathogenic E. coli are E. coli bacteria that do not cause disease, but instead live naturally in the large intestine.
- Nonpenetrant trait
A genetic trait (characteristic) that is present in the genome but does not manifest itself in the individual. By contrast, a penetrant trait is one that manifests itself. If, for example, if 100 people have a particular genetic trait but only 80 of them express it, the penetrance of that trait is 80%. The trait […]
- Nonrandom
Not by chance alone. Not in keeping with the process by which an outcome is determined solely by chance, for example, by a coin flip. The opposite of nonrandom is random.
- Nonseminoma
A type of testicular cancer that arises in specialized sex cells called germ cells that give rise to sperm. Nonseminomas include embryonal carcinoma, teratoma, choriocarcinoma, and yolk sac tumor.