Akademik

1. The arrangement of the details of a part; the manner of formation of a part. 2. A tissue or formation made up of different but related parts. 3. In chemistry, the specific connections of the atoms in a given molecule. SYN: structura. [L. structura, fr. struo, pp. structus, to build]

- accessory structures [TA] parts accessory to the main organ or s.. SYN: accessory organs (1), adnexa, annexa.

- accessory visual structures [TA] the eyelids, with lashes and eyebrows, lacrimal apparatus, conjunctival sac, and extrinsic muscles of the eyeball. SYN: structurae oculi accessoriae [TA], accessory organs of the eye, accessory visual apparatus, adnexa oculi, appendages of eye, organa oculi accessoria.

- brush heap s. haphazard interlocking of fibrils in a gel or hydrocolloid impression material.

- chi s. a joint between two DNA duplex molecules. SEE ALSO: chi sequence.

- cointegrate s. a s. of DNA produced by the fusion of two replicons, one possessing a transposon.

- complementary structures structures that define one another; E.G., the two strands of duplex DNA.

- crystal s. the arrangement in space and the interatomic distances and angles of the atoms in crystals, usually determined by x-ray diffraction measurements.

- denture-supporting structures the tissues, teeth, and/or residual ridges, which serve as the foundation for removable partial or complete dentures.

- fine s. SYN: ultrastructure.

- gel s. brush heap s. of fibrils giving firmness to hydrocolloids.

- Holliday s. SYN: Holliday junction.

- primary s. in a macromolecule, the sequence of subunits that make up that macromolecule; e.g., the amino acid sequence of a protein.

- quaternary s. the three-dimensional arrangement and constitution of a multimeric ( I.E., a substance containing more than one biopolymer) macromolecule; E.G., the α₂β₂ tetramer of hemoglobin A.

- secondary s. the localized arrangement in space of regions of a biopolymer; often these types of structures are regular and recurring along one dimension; E.G., the α-helix often found in proteins.

- tertiary s. the three-dimensional configuration of a biopolymer.

- tuboreticular s. tubules 20–30 nm in length that lie within cisterns of smooth endoplasmic reticulum; observed in connective tissue diseases such as SLE, and in various cancers and virus infections.

struc·ture 'strək-chər n

1) something (as an anatomical part) arranged in a definite pattern of organization

2 a) the arrangement of particles or parts in a substance or body <molecular \structure>

b) organization of parts as dominated by the general character of the whole <personality \structure>

3) the aggregate of elements of an entity in their relationships to each other