• Theme A — Thermodynamic framing of helix–coil transitions incorporating noncovalent side interactions: partition-function/matrix formalisms unify helix propensity with hydrophobic contacts across short chains [2], [3], [1], [16], [10], [9].

• Theme B — Early computational conformational analysis: formal methods to enumerate sterically allowed polypeptide conformations for short sequences, enabling systematic structural exploration via computer methods [7], [5].

• Theme C — Spectroscopic constraints drive conformational models: UV/rotatory dispersion and Cotton effects provide empirical constraints that shape and validate polypeptide structures [20], [13], [17], [15].

• Theme D — Side-chain chemistry and long-range stabilization: hydrophobic bonds and noncovalent interactions modulate helix stability beyond backbone contacts, including interhelical effects and matrix treatments [9], [3], [16], [10], [11].