<p>The theoretical description for 4-4´-dihydroxyazobenzene CoO(OH) – assisted electrochemical determination in the mushroom pulp, food, and biological liquids has been described. In this system, a squaraine dye is used as a Cobalt(III)oxyhydroxide stabilizer and electron transfer mediator. It is shown that, contrary to the large part of the systems with cobalt (III) oxyhydroxide, this system will behave more stably, providing an efficient diffusion-controlled process. On the other hand, the oscillatory and monotonic instabilities, although possible, are caused by the double electric layer influences of either chemical or electrochemical stage.</p>

Proximal humeral fractures constitute 5-8% of all the fractures of the limbs and 80% of fractures of the upper arm. To report about remote results of the suggested tactics of surgical treatment of proximal humeral fractures. Satisfactory results of treatment were found in 21 (80,7%) patients out of 26 (72%), who underwent closed reduction of fractures with pin fixation. This group of patients achieved consolidation in optimal terms, and the function of the shoulder joint was satisfactory with abduction angle of 90°. 2 (7,7%) patients experienced secondary dislocation of fragments and their QuickDASH score was 38.4. 3 (11,6%) patients achieved consolidation of fracture, but stable contracture of the shoulder joint occurred. Their QuickDASH score was 38.4. Osteosynthesis with plates was performed in 10 patients. 3 (30%) of them developed aseptic necrosis of the humeral bone head, 2 (20%) patients developed suppuration of the soft tissues which produced a negative effect of the patients’ ability to work ‒ QuickDASH score 42,7, 5 (50%) patients admitted satisfactory results of treatment ‒ QuickDASH score 21,5. Osteosynthesis with plates was performed in 10 patients. 3 (30%) of them developed aseptic necrosis of the humeral bone head, 2 (20%) patients developed suppuration of the soft tissues which produced a negative effect of the patients’ ability to work ‒ QuickDASH score 42,7, 5 (50%) patients admitted satisfactory results of treatment ‒ QuickDASH score 21,5. The tactics of surgical treatment of patients with proximal humeral fracturesdepends on the following: type of a fracture, patient’s age, concomitant pathology and osteoporosis available, and patient’s social needs.

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