Substrate characterization for underwater gamma spectrometry: tank measurement results utilizing efficiencies calculated via Monte-Carlo code.

In order to study the sediment contamination, underwater gamma-ray spectrometry measurements performed by the sub-marine detector Canberra HpGe with a relative efficiency of 80% were carried out in an equipped tank at the Ukrainian Hydrometeorological Institute of Kiev. Different substrates, certified sources and experiment geometrical set-up were arranged. Efficiencies were calculated by in situ object counting system (ISOCS) software.

[Plastic surgery of the anterior abdominal wall in children using synthetic resolving materials].

The data on the first experience in the use of synthetic resolvable materials in plasty of the anterior abdominal wall in children are reported. Tissue glue compositions based on alpha-cyanoacrylates as well as connective biocompatible elements (CBE) developed at the SRIIMT were used. An aponeurotic suture-glue duplication was utilized for plastic enforcement of the anterior abdominal wall; individual methods were developed for each concrete localization of the defects.

[A new approach to the creation of heart valve xenograft bioprostheses resistant to calcification].

The calcium binding activity of xenograft tissue in stages of modification with papain, diphosphonates, and heparin was studied on a model of accelerated calcification in subcutaneous implantation of cusps of pig's aortic bioprostheses to 42 rats. In immobilization of 3-amino-1-oxypropylidendiphosphonic acid and xydiphon the amount of calcium in the implants reduced 50 times as compared to the control. The first stage of ion-covalent heparin immobilization--treatment with albumin--increased the calcium-binding activity of the biomaterial, but subsequent heparinization reduced again the calcium content in the cusp tissue to the level attained in the stage of diphosphonate immobilization.