| nucleic acid base | A purine or pyrimidine; found in naturally occurring nucleic acids such as DNA. (05 Mar 2000) |
|---|---|
| nucleinic base | An obsolete term for purine. (05 Mar 2000) |
| denture base | That part of a denture which rests on the oral mucosa and to which teeth are attached, that part of a complete or partial denture which rests upon the basal seat and to which teeth are attached. Synonym: saddle. (05 Mar 2000) |
| dissociation constant of a base | Expressed by the general equation [B+][OH-]/[BOH] = Kb, where BOH is the undissociated base. (05 Mar 2000) |
| internal base of skull | <anatomy> The interior aspect of the skull base on which the brain rests; the floor of the cranial cavity. See: base of skull. Synonym: basis cranii interna. (05 Mar 2000) |
| ointment base | The vehicle into which active ingredients may be incorporated. Petrolatum (which may be stiffened with wax) is the most widely used greasy ointment base and is suitable for the incorporation of oleaginous materials. Lin-containing bases will absorb water (and dissolved materials) and form water-in-oil type emulsions. Water soluble (washable) bases are often derived from polymers of ethylene glycol (PEGS); these will absorb water and ingredients dissolved in the water. Ointment bases are usually pharmacologically inert but may entrap water and serve to keep the skin from dying or to provide an emollient protective film. (05 Mar 2000) |
| temporary base | <cell biology> A hypothetical cell adhesion molecule possibly involved in sponge cell adhesion, existence unproven. (18 Nov 1997) |
| tinted denture base | A denture base that simulates the colouring and shading of natural oral tissues. (05 Mar 2000) |
| tooth-borne base | The denture base restoring an edentulous area which has abutment teeth at each end for support; the tissue which it covers is not used for support. (05 Mar 2000) |
| trial base | <cell biology> A hypothetical cell adhesion molecule possibly involved in sponge cell adhesion, existence unproven. (18 Nov 1997) |
| Troeger's base | <chemical> Pharmacological action: enzyme inhibitor Synonym: 2,8-dimethyl-6h,12h-5,11-methanodibenzo(b,f)(1,5)-diazocine (26 Jun 1999) |
| external base of skull | External aspect of the base of skull Synonym: norma basilaris, basis cranii externa, norma inferior, norma ventralis. (05 Mar 2000) |
| FAPG base | <chemical> New topical vehicle for dermatological use; contains propylene glycol, stearyl alcohol, polyethylene glycol, glycerol Chemical name: 1,2,3-propanetriol, mixt. With alpha-hydro-omega-hydroxypoly(oxy-1,2-ethanediyl), 1-octadecanol and 1,2-propanediol (26 Jun 1999) |
| Lewis base | A base that is an electron-pair donor. (05 Mar 2000) |