[Optical rotatory dispersion and circular dichroism of enzyme- and alkali-dissolved collagen]. / Dispersiia opticheskog vrashcheniia i krugovoi dikhroizm fermento- i shchelochnorastvorennogo kollagena

Viscosity, dispersion of optical rotation and circular dichroism of collagen solutions was determined. Collagen solutions were obtained after treating collagen with enzymes--protorizine or prototerrizine, or with the mixture of 2,5 M NaOH--1 M Na2SO4 and acid-soluble collagen from calf skin. Molecules of "forcedly" solved collagen have an asymmetric shape with a conformation of a three-helical helix. After being heated the latter undergoes the transformation helix-coil similar to tropocollagen molecules.

[Application of rare-earth elements as labels in studying biologically active compounds. III. Natural and magnetic circular dichroism of complexes of rare-earth elements with pyridoxalidene amino acid complexes]. / Primenenie redkozemel'nykh élementov v kachestve metok dlia issledovaniia biologicheski aktivnykh soedinenii. III. Estestvennyi i magnitnyi krugovoi dikhroizm kompleksov RZE s piridoksalidenaminokislotami

Circular dichroism of pyrodoxalidenaminoacid complexes with rare earths and other metals and magnetic circular dichroism of several neodimium complexes are investigated. CD spectra of the complexes of the rare earths with azometines made of different amino acids could be classified into four groups. Some of the CD spectra are shown to be individual. The dependence of the CD spectra on the rare earch ion dimension is considered. Coordination of the rare earth ions is shown to be the same as in the case of zinc, cobalt, iron or copper.