| base of heart | That part of the heart that lies opposite the apex, formed mainly by the left atrium but to a small extent by the posterior part of the right atrium; it is directed backward and to the right and is separated from the vertebral column by the oesophagus and aorta. Synonym: basis cordis. (05 Mar 2000) |
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| base of hyoid bone | The body of the hyoid bone, from which the greater and lesser horns extend. Synonym: corpus ossis hyoidei, base of hyoid bone, basihyal, basihyoid. (05 Mar 2000) |
| base of lung | The lower concave part of the lung that rests upon the convexity of the diaphragm. Synonym: basis pulmonis. (05 Mar 2000) |
| base of mandible | The rounded inferior border of the body of the mandible. Synonym: basis mandibulae. (05 Mar 2000) |
| base of metacarpal bone | The expanded proximal extremity of each metacarpal that articulates with one or more of the distal row of carpal bones. Synonym: basis ossis metacarpalis. (05 Mar 2000) |
| base of metatarsal bone | The expanded proximal extremity of each metatarsal bone; it articulates with one or more of the distal row of tarsal bones. Synonym: basis ossis metatarsalis. (05 Mar 2000) |
| base of modiolus | The part of the modiolus enclosed by the basal turn of the cochlea; it faces the lateral end of the internal acoustic meatus. See: cochlear area. Synonym: basis modioli. (05 Mar 2000) |
| base of patella | The superior border of the patella to which the tendon of the rectus femoris attaches. Synonym: basis patellae. (05 Mar 2000) |
| base of phalanx | The expanded proximal end of each phalanx in the hand or foot that articulates with the head of the next proximal bone in the digit. Synonym: basis phalangis. (05 Mar 2000) |
| base of prostate | The broad upper surface of the prostate contiguous with the bladder wall. Synonym: basis prostatae. (05 Mar 2000) |
| base of renal pyramid | The outer broad part of a renal pyramid that lies next to the cortex. Synonym: basis pyramidis renis. (05 Mar 2000) |
| base of sacrum | The upper end of the sacrum that articulates with the body of the fifth lumbar vertebra in the midline and the alae on either side. Synonym: basis ossis sacri. (05 Mar 2000) |
| base of skull | The sloping floor of the cranial cavity. It comprises both the external base of skull (external view) and the internal base of skull (internal view). See: internal base of skull. Synonym: basis cranii, cranial base. (05 Mar 2000) |
| base of stapes | The flat portion of the stapes that fits in the oval window. Synonym: basis stapedis, footplate, foot-plate. (05 Mar 2000) |
| base of tongue | The posterior attached portion of the tongue. Synonym: radix linguae, base of tongue. (05 Mar 2000) |
| penton base | <chemical> Human adenovirus capsid component Synonym: adenovirus penton base protein, penton, penton base protein, type II avian adenovirus, penton, adenovirus, avian (26 Jun 1999) |
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| metal base | A metallic portion of a denture base forming a part of the wall of the basal surface of the denture; it serves as a base for the attachment of the plastic (resin) part of the denture and the teeth. (05 Mar 2000) |
| peroxy-Y-base | <chemical> Tricyclic imidazo derivative of guanine Chemical name: 1h-imidazo(1,2-a)purine-7-butanoic acid, 4,9-dihydro-beta-hydroperoxy-alpha-((methoxycarbonyl)amino)-4,6-dimethyl-9-oxo-, methyl ester (26 Jun 1999) |
| methamphetamine base | A form of methamphetamine that can be readily volatilised. (05 Mar 2000) |
| complementary base pairing | <molecular biology> The pairing of complementary nucleotide bases (adenine and thymine, guanine and cytosine) to each other via hydrogen bonds from opposite strands of a double stranded nucleic acid (such as DNA or RNA), thereby holding the double-stranded nucleic acid together. (09 Oct 1997) |
| complementary base pairs | <molecular biology> The crucial property of DNA is that the two strands are complementary: Guanine and cytosine are complementary and pair up through their hydrogen bonds, as are adenine and thymine that only form two hydrogen bonds. (adenine and uracil in RNA). (18 Nov 1997) |
| wobble base | The 3' codon base that is less strictly specified in the genetic code. See: wobble, wobble hypothesis. (05 Mar 2000) |
| conjugate acid-base pair | In prototonic solvents (e.g., H2O, NH3, acetic acid), two molecular species differing only in the presence or absence of a hydrogen ion (e.g., carbonic acid/bicarbonate ion or ammonium ion/ammonia); the basis of buffer action. (05 Mar 2000) |
| cranial base | The sloping floor of the cranial cavity. It comprises both the external base of skull (external view) and the internal base of skull (internal view). See: internal base of skull. Synonym: basis cranii, cranial base. (05 Mar 2000) |
| cyanine green G base | <chemical> Pharmacological action: dye Synonym: d.c. Green no. 6, 1,4-di-4-toluidinoanthraquinone, solvent green 3 (26 Jun 1999) |
| pressor base | One of several products of intestinal putrefaction believed to cause functional hypertension when absorbed, any alkaline substance that raises blood pressure. Synonym: pressor amine, pressor substance. (05 Mar 2000) |
| Schiff base | The reaction of a primary amine with an aldehyde or ketone yields an imine sometimes called a Schiff base. When an arylamine is used the Schiff base may form an intermediate in a staining reaction, for example for polysaccharides. (18 Nov 1997) |
| purine base | A purine. (05 Mar 2000) |
| pyrimidine base | <biochemistry> A family of 6-membered heterocyclic compounds occurring in nature in a wide variety of forms. They are planar and aromatic in character and include several nucleic acid constituents (cytosine, thymine, and uracil) and form the basic structure of the barbiturates. It is the parent compound of the pyrimidine bases of nucleic acid. (21 Jun 2000) |
| shellac base | A resinous wafer adapted to maxillary or mandibular casts to form baseplates. (05 Mar 2000) |