1Biochemistry The characteristic sequence of amino acids forming a protein or polypeptide chain, considered as the most basic element of its structure.
〔生化〕（氨基酸）一级结构，初生结构，原结构
Example sentencesExamples
A protein's primary structure refers to the sequence of amino acids in the molecule.
Although various substitutions occur in primary structures of immunoglobulin light chains, no common amino acid has yet been identified which is unique to AL amyloidosis or other immunoglobulin-related diseases.
The primary structure of peptides and proteins refers to the linear number and order of the amino acids present.
This, in turn, provides additional support for the hypothesis that life at high temperatures imposes unusual functional constraints on the primary structure of proteins.
The sequence of amino acids, called the primary structure of the enzyme, is determined by the gene coding for the enzyme.
2Aeronautics The parts of an aircraft whose failure would seriously endanger safety.
〔航空〕主要结构；承力骨架
Example sentencesExamples
All of the airplane's primary structure was found at the accident site.
Fusion welded aluminum primary structures in airplanes are virtually nonexistent, because the high-strength alloys utilized have low weldability and low weld-joint efficiencies.
The certification of the 737 Composite Horizontal Stabilizer was the first large commercial aircraft primary structure in the world certified for commercial aircraft.
Primary structure for present transport aircraft is designed, based on average expected operational conditions and average fatigue test results, for 120,000 hrs.
Definition of primary structure in US English:
primary structure
noun
1Biochemistry The characteristic sequence of amino acids forming a protein or polypeptide chain, considered as the most basic element of its structure.
〔生化〕（氨基酸）一级结构，初生结构，原结构
Example sentencesExamples
Although various substitutions occur in primary structures of immunoglobulin light chains, no common amino acid has yet been identified which is unique to AL amyloidosis or other immunoglobulin-related diseases.
This, in turn, provides additional support for the hypothesis that life at high temperatures imposes unusual functional constraints on the primary structure of proteins.
The primary structure of peptides and proteins refers to the linear number and order of the amino acids present.
The sequence of amino acids, called the primary structure of the enzyme, is determined by the gene coding for the enzyme.
A protein's primary structure refers to the sequence of amino acids in the molecule.
2Aeronautics The parts of an aircraft whose failure would seriously compromise safety.
〔航空〕主要结构；承力骨架
Example sentencesExamples
Primary structure for present transport aircraft is designed, based on average expected operational conditions and average fatigue test results, for 120,000 hrs.
The certification of the 737 Composite Horizontal Stabilizer was the first large commercial aircraft primary structure in the world certified for commercial aircraft.
All of the airplane's primary structure was found at the accident site.
Fusion welded aluminum primary structures in airplanes are virtually nonexistent, because the high-strength alloys utilized have low weldability and low weld-joint efficiencies.