Chitin and Its Derivative Chitosan: Distribution in Nature, Applications, and Technology Research (A Review).

The present review highlights the chitin/chitosan as biopolymers that are promising for biomedical research development. Our goal was to assess the potential for practical use of these biopolymers and to summarize information on traditional and innovative technologies for their production and purification. The widespread occurrence of chitin and chitosan in nature as well as the unique chemical and biological properties of chitosan are reasons of growing interest in the use of the latter in several pharmaceutical fields.

[About the first publication of I.M. Sechenov. (To the 195th anniversary of his birth)].

Ivan Mikhailovich Sechenov is a Russian physiologist, a natural scientist, and the creator of the Russian physiological school. The classic work «Reflexes of the Brain», published in 1863, became revolutionary in its own way for medicine and society, since the reflex nature of conscious and unconscious activity was proved. Along with numerous well-known scientific works, there is an early student publication in the Moscow Medical Journal published by A.

Rapidly Progressive Portal Cavernoma Cholangiopathy in a Patient With Infeasible Decompressive Shunt Surgery.

We present a 27-year-old man with a 2-year history of extrahepatic portal vein obstruction and selective immunoglobulin A deficiency, referred for acute cholangitis from portal cavernoma cholangiopathy (PCC). Because recurrent cholangitis rapidly led to liver failure, orthotopic liver transplantation (OLT) was successfully performed. To date, this is one of the few cases of patients with symptomatic PCC who required OLT and the first case who had a successful 6-year follow-up.

[Clinico-psychological profile and life quality of patients with post-COVID syndrome].

Objective: To study clinico-psychological profile and life quality of patients with post-COVID syndrome.

Material And Methods: We examined 162 patients aged 24-60 years with confirmed SARS-CoV-2 infection which having symptoms that served as the basis for the diagnosis of post-COVID syndrome. Patients underwent general neurological and somatic examination with allocation of the corresponding neurological syndromes.

Luminescent polyelectrolytes with antiviral activity.

Radical polymerization was used to synthesize and characterize (co)polymers with sodium styrenesulfonate (NaSS), 4-methacryloylamidosalicylic acid (MASA), and -vinylpyrrolidone, which have a low cytotoxicity and a high antiviral activity against the human respiratory syncytial virus. The interaction of copolymers with Tb ions was studied. The complexes formed in dilute aqueous solutions at a concentration of MASA units ⩽ 1 · 10 mol L demonstrate a strong luminescence.