| 单词 | primary structure |
| 释义 | > as lemmasprimary structure primary structure n. (a) Aeronautics the parts of an aircraft whose failure would seriously endanger safety; (b) Biochemistry the first level of complexity in the structure of a protein or nucleic acid molecule, consisting of the linear sequence of amino acid or nucleotide residues (cf. secondary adj. 3y). ΘΚΠ society > travel > air or space travel > a means of conveyance through the air > aeroplane > parts of aircraft > [noun] > essential structural parts primary structure1939 1939 Aircraft Engin. Feb. 66/1 The primary structure of the main plane is erected in a wall jig. 1939 Proc. Royal Soc. B. 127 20 These protein molecules have a primary and a secondary structure. The primary structure is the polypeptide chain which may perhaps be arranged in cyclol cages. 1952 K. U. Linderstrøm-Lang Proteins & Enzymes 58 The presence of intrahelix as well as interhelix bonds may justify a classification into secondary (intrahelix) and tertiary (interhelix) structures, as distinct from the primary structure of the simple β-chain. 1964 J. E. D. Williams Operation of Airliners ix. 133 To ensure that throughout the operational life of the aircraft the possibility of disastrous fatigue failure is remote, the primary structure must either have an extremely long probable life or be designed to fail safely. 2003 Nature 30 Oct. 977/2 The primary structure of osteocalcin (OC) is highly conserved among vertebrates. < as lemmas |
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