Multiple IR Research Articles

Polaromicrotribometric study of polyphenylene oxide film formation on metal electrodes by electrolysis of disubstituted phenols

The anodic oxidation of numerous disubstituted phenols has been studied in a base and alcohol media using various metals (Fe, Cu, Ni, Cr, Ti, Zn, Au, Pt) as electrodes. For 2,6-dimethylphenol, the passivity phenomenon shown by simultaneous recording of the current/potential and friction/potential curves (polaromicrotribometry) is explained by formation on the electrode of a thin, insulating film of polyphenylene oxide (PPO) whose chemical nature has been recognized by multiple reflection ir spectroscopy. The measured physical characteristics of this film (thickness, adherence, hydrophobicity, coefficient of friction...) indicate its possible interest as a protective coating for metallic surfaces.

Genetic control of the immune response: ability of antigens of defined amino acid sequence to be recognized by the Ir‐1 gene system

Mice were injected with a series of (T,G)-A--L[poly (L Tyr, L Glu)-poly DL Ala)--poly (L Lys)]-like compounds with side chains of homogeneous sequences: T-A--L, GT-A--L, GGT-A--L, and TG-A--L. T-A--L was not immunogenic. However, T-A--L was able to bind antibodies to (T, G)-A--L 509, and this binding could not be blocked by A--L. When complexed with bovine serum albumin, T-A--L, was immunogenic in both responder and nonresponder strains of mice. GT-A--L and GGT-A--L were both immunogenic and elicited the characteristic responder-nonresponder difference induced by (T,G)-A--L. TG-A--L was also immunogenic, but there was considerable overlap in the response of responder and nonresponder strains. On the average, responder mouse serum had a slightly higher antigen-binding capacity than nonresponder mouse serum. In contrast to antibodies against GGT-A--L, antibodies against TG-A--L bound heterologous antigens poorly. These data, along with the results of other investigators, are consistent with the hypothesis that there are multiple Ir- 1 genes which recognize different sequences. The specificity of the Ir- 1 genes is extraordinary. The polypeptides TG-A--L, TGTG-A--L and GTTG-A--L do not appear to be recognized by these genes.