Heteroclinic cycles and chaos in a system of four identical phase oscillators with global biharmonic coupling.

We study a system of four identical globally coupled phase oscillators with a biharmonic coupling function. Its dimension and the type of coupling make it the minimal system of Kuramoto-type (both in the sense of the phase space's dimension and the number of harmonics) that supports chaotic dynamics. However, to the best of our knowledge, there is still no numerical evidence for the existence of chaos in this system.

Cyrillic in the Geolinguistic Space.

The position of the Cyrillic alphabet in the modern world and in historical retrospective is analyzed in this article. The causes and consequences of the rejection of the Cyrillic script by a number of countries are considered. Calculations of the number of users of the Cyrillic alphabet from the beginning of the 20th century and a forecast of changes in their number in the coming years are given.

[Falcine chondrosarcoma (case report and literature review)].

Chondrosarcoma is a rare malignancy composed of transformed cells of cartilage. This cancer is characterized by slow growth. Almost 75% of intracranial chondrosarcomas are observed on the skull base and grow from bone synchondrosis.

[Combined surgical treatment of cavernous internal carotid artery pseudoaneurysm].

We describe a clinical case of surgical treatment of a cavernous internal carotid artery (ICA) pseudoaneurysm that developed due to damage to the artery during transsphenoidal resection of pituitary adenoma. Clinically, the aneurysm presented with episodes of profuse epistaxis that required tight nasal packing. Given the presence of an open circle of Willis, the patient underwent staged surgery that included the creation of a high-flow extra-intracranial anastomosis, subsequent endovascular ICA occlusion at the pseudoaneurysm level using balloon-assisted coiling, and endoscopic debridement of the nasal cavity.

[Diagnostic value of cardiac troponin T increase in critically ill patients].

There are presently reports on elevated levels of cardiac troponins in patients without acute myocardial infarction (AMI). The objective of this investigation was to study the diagnostic value of increased blood cardiac troponin T levels in patients without its clinical picture and ECG changes characteristic of AMI. The study covered 72 patients (48 males and 24 females) aged 54 to 87 years (mean 69.

[Optimization of anesthetic management in blepharoplasty].

The anesthetic management in cosmetic surgery must be as much controllable, safe and comfortable for a patient as possible, i.e. it must be in line with all requirements of outpatient surgery.

[Doppler ultrasonic evaluation of hepatic functional reserve].

Ultrasonic Doppler measurement of the blood flow in the portal vein and hepatic artery was conducted to evaluate the function and functional reserve of the liver in 146 patients with various forms of cholangitis combined with biliary cirrhosis and hepatic insufficiency. The functional reserve of the liver was judged by comparison of the basic blood flow on a fasting stomach with the blood flow after a functional histamine load. Five types of responses of the portal vein blood flow to the functional load according to the degree of disturbed hepatic function were revealed.

[Disorders of organic hemodynamics of the liver and their correction in suppurative cholangitis].

The blood flow in the portal vein and hepatic artery was studied by means of ultrasonic Doppler flow measurement to investigate organic and regional hemodynamics of the liver in purulent cholangitis. The blood flow in the portal vein was found to be significantly diminished in patients with acute cholangitis and hepatic failure. Hepatic microcirculation was studied on a experimental model of obstructive jaundice and obstructive purulent cholangitis in rats by polarographic measurement of hydrogen clearance.

[Treatment of pancreatic cysts using percutaneous punctures and drainage under ultrasonic control].

Percutaneous punctures and drainage of pancreatic cysts under USE control were conducted in 12 patients. It was found that the method is relatively simple, less injurious, and makes it possible in infected cysts to perform rapid cleansing and drainage of the purulent cavity without the hazard of the development of complications and to achieve in some cases complete sclerosis of the cystic cavity if it is not connected with the ductal system.

[Immunoenzyme analysis of human IgG in the kinetic mode].

A kinetic sandwich enzyme-linked immunosorbent assay for the detection of human IgG (used as a model antigen) has been developed. Rabbit antihuman IgG has been used both for coating polystyrene microtitration plates and for the preparation of the conjugate of anti-human IgG with horse-radish peroxidase. The kinetics of the reaction of the antigen and the antibody-peroxidase conjugate with the reagents immobilized on polystyrene plates has been studied.