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Far‐infrared spectra in the region from 700 to 60 cm−1 have been measured for the α‐helix structures of poly(L‐α‐amino‐n‐butyric acid), poly‐L‐norvaline, poly‐L‐norleucine, and poly‐L‐leucine and for the β‐form structures of poly(L‐α‐amino‐n‐butyric acid),...
The intrinsic viscosity and sedimentation coefficient, of native and single‐stranded T7 DNA have been determined at 25°C as a function of ionic strength in neutral and alkaline NaCl. The relationship between (η) and S020,w is well represented by the Mandelkern‐Flory equation over the entire...
The crystal structure of L‐cis‐3, 6‐dimethyl‐2,5‐piperazinedione (L‐alanyl‐L‐alanyl‐2,5‐diketopinerazine) has been determined. The unit cell is triclinic with a = 8.05, b = 6.08, c = 5.15 Å, α = 131.7°, β = 82.4°, γ = 106.6°. The space group is P1 with one molecule per...
The theory of polyelectrolyte solution of Alexandrowicz: and Katchalsky is used to calculate the electrostatic potential of single stranded polynucleotides for different ionic strength. We have considered the potential of double stranded DNA as the superposition of the different potentials...
Single‐strand breaks (ssb) in opposite strands of DNA can be sufficiently near that a double‐strand break (dsb) results. A theory is presented by which the maximum number h of base pairs which cannot prevent double‐strand breakage can be determined from the rates of production of ssb and...
Poly(γ‐p‐chlorobenzyl L‐glulamate), for which theoretical calculations have shown only a small difference in energy between the left‐ and right‐handed α‐helices, has been synthesized and its screw sense determined by ORD in various solvents. In all solvents studied, a right‐handed...
The flow birefringence, extinction angles, and intrinsic viscosity have been determined at low velocity gradients for a complex of T2 bacteriophage DNA and methylated serum albumin prepared in dilute solution to a stoichiometry of approximately 90 proteins per DNA molecule. Comparative data upon...
The nature of a specific association between acriflavine and cellular DNA was investigated by subjecting the DNA of intact cells to denaturation, ultraviolet radiation, and base analog substitution. The predictable modifications of DNA structure were then correlated with the quantitative...
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