Food security in Ukraine today's conditions.

The system-forming element of national security is food security, which guarantees effective management of the food system, ensuring the food needs of the appropriate quantity and quality of each country's citizen. Despite the significant potential of the agricultural sector, which forms the basis of food security, the need to analyse the state of food security in the current situation is due to military operations on the territory of Ukraine, which led to its negative global results. In this regard, the need to develop effective strategies and legal regulation is essential to ensure national and global food security, which in turn requires coordination of efforts of all countries and international organisations through international cooperation.

A novel extended-spectrum β-lactamase, SGM-1, from an environmental isolate of Sphingobium sp.

SGM-1 is a novel class A β-lactamase from an environmental isolate of Sphingobium sp. containing all of the distinct amino acid motifs of class A β-lactamases. It shares 77 to 80% amino acid sequence identity with putative β-lactamases that are present on the chromosome of all Sphingobium species whose genomes were sequenced and annotated.

Class A carbapenemase FPH-1 from Francisella philomiragia.

FPH-1 is a new class A carbapenemase from Francisella philomiragia. It produces high-level resistance to penicillins and the narrow-spectrum cephalosporin cephalothin and hydrolyzes these β-lactam antibiotics with catalytic efficiencies of 10(6) to 10(7) M(-1) s(-1). When expressed in Escherichia coli, the enzyme confers resistance to clavulanic acid, tazobactam, and sulbactam and has K(i) values of 7.

Theoretical analysis of physicochemical processes occurring during water treatment by ozone and ultraviolet radiation.

The paper presents a kinetic model developed for ozone dissolution in water and taking into account convective and diffusion processes occurring in the vicinity of floating bubbles that contain an ozone-air mixture. It was shown that the gradient of ozone concentration in a convective-diffusion layer and consequently the rate of ozone transfer from bubbles to the solution depended on the rate of ozone decomposition both in its reaction with organic admixtures and in the conditions of exposure to ultraviolet radiation. The obtained kinetic curves of destruction of organic compounds and changes of ozone concentration in water and ozone-air mixture are compared with experimental data for humic acids.

[Duodenoplasty in combination with segmentary resection of gastric corpus in preservation of innervated pyloric-antral segment in patients with decompensated duodenal stenosis of the ulcer origin].

A new method of surgical treatment of decompensated duodenal stenosis, consisting of duodenoplasty with duodenal ulcer excision, segmentary resection of gastric corpus with preservation of pyloroantral portion and formation of fundocorporoantrumanastomosis on the whole opening, was presented. In 24 patients in late follow-up terms after the operation the rhythmical, portional evacuation of gastric content was observed, the ulcer recurrency was not noted.