A ladder-type coordination polymer constructed from two macrocyclic units – calix[4]arene tetracarboxylate and azamacrocyclic nickel(ii) complex

Spatially-separated polar channels and non-polar voids were shown to coexist in the crystal of a new type of coordination polymer formed by a hexaazamacrocyclic nickel(ii) cation and a lower rim substituted calix[4]arene tetracarboxylate trianion.

[Effect of freezing on cord blood serum proteins]

The effect of freezing regimes and storage temperatures on protein conformation and the spectrum of cord blood serum has been investigated. Changes in the parameters of ESR spectra of spin probes in cord blood serum after slow freezing and subsequent thawing were established, indicating protein conformational changes characterized by loosening. This fact is confirmed by an earlier process, the first stage of albumin heat denaturation, as indicated by calorimetric data. It was shown that slow cooling results in the aggregation of serum protein in which serum albumin and immunoglobulins play an important role. It was concluded that, for retaining the properties, of cord blood serum proteins, it is preferable to perform cooling at a rate not lower than 100 degrees C/min and a storage temperature of -80 degrees C and lower.