Aerosol generation from different wind instruments.

The potential airborne transmission of COVID-19 has raised significant concerns regarding the safety of musical activities involving wind instruments. However, currently, there is a lack of systematic study and quantitative information of the aerosol generation during these instruments, which is crucial for offering risk assessment and the corresponding mitigation strategies for the reopening of these activities. Collaborating with 15 musicians from the Minnesota Orchestra, we conduct a systematic study of the aerosol generation from a large variety of wind instruments under different music dynamic levels and articulation patterns.

[ESTIMATION OF THE EFFECTS OF GEOMAGNETIC AND SOLAR ACTIVITY ON THE HUMAN BRAIN BIOELECTRICAL PROCESSES WITH STRUCTURAL FUNCTION].

We investigate the impacts of sharp variations in solar and geomagnetic activity (GMA) at high latitudes on the human brain bioelectrical activity by means of the empirical structure function of multi-channel EEG. Ten healthy men ages 19 to 37 took part in the study. EEG was recor- ded daily over the 25 days test period that was marked by C- and M-class solar flares and geomagnetic storm levels in the G2-G3 range.

The structure function as new integral measure of spatial and temporal properties of multichannel EEG.

The first-order temporal structure functions (SFs), i.e., the first-order statistical moment of absolute increments of scaled multichannel resting state EEG signals in healthy children and teenagers over a wide range of temporal separation (time lags) are computed.

[Proctectomy for low rectal cancer with restoration of sphincter, levator and reservoir in perineal part of intestine].

Aim: To develop surgery of proctectomy with total mesorectectomy, internal and deep external sphincter resection with bringing down of intestine and formation of sphincter, levator and reservoir in its perineal part.

Material And Methods: Nine patients aged 38-74 years with low-ampullar rectal adenocarcinoma placed in 8-25 mm from anus underwent proctectomy with total mesorectectomy, internal and deep external sphincter resection and bringing down. There were 4, 1, 3 and 1 patients with T2N0M0, T2N1M0, T3N0M1 and T4N2M1 stages respectively.

[Proctectomy and sphincterolevatoroplasty in cancer of the inferioampular part of rectum with involvement of the anal canal].

Proctectomy with total mesorectumectomy, resection of the interior sphincter, deep parts of the external sphincter and bringing down were fulfilled according to an original authors' method in 7 patients aged from 38 to 78 years for cancer of the inferioampular part of the rectum with tumor located within the limits 8-35 mm from the anus (T3N1MO (n=1), T3NOM1 (n=1), T4N2M1 (n=1). Six months after operation conscious urge to defecation 1-2 times a day and containment of stools were noted and a year later it was possible to ignore urges during 15-30 min. In 5 patients T3NOM0--T3N1M0 relapse-free period for 3-5 years was noted.

Cortical-subcortical interactions and the regulation of the functional state of the brain in acute hypoxia in humans.

The mechanisms regulating the functional state (FS) of the brain were studied in humans in conditions of dosed acute hypoxia (breathing a mixture of 8% oxygen in nitrogen for 15-25 min). The dynamics of the FS of the brain due to changes in the balance of the activities of brain regulatory structures in hypoxia were reflected in rearrangements of EEG spatial relationships (factor and cluster analysis of EEG crosscorrelation matrixes) and the redistribution of intracerebral locations of electrically equivalent dipole sources (EEDS), with increases in EEDS density in the projections of the medial and basal parts of the temporal lobes of the hemispheres (EEDS tomography data). Changes in cortical-subcortical interactions were characterized by a decrease in the tone of the activatory brain system, a decrease in the inhibitory control of subcortical structures by neocortical formations, and activation of limbic system and hypothalamic structures.

[Cortical-subcortical interactions and the brain functional state regulation under acute hypoxia in man].

Regulation mechanisms of the brain functional state (FS) were studied in man during acute hypoxic conditions (inhalation of 8% O2 hypoxic air for 15-25 minutes). Changes in balance of the brain regulatory structures activities caused by hypoxia determine FS dynamics that is reflected in the reorganization of the EEG spatial interrelations (by data of factor and cluster analysis of EEG cross-correlation matrices), as well as translocation of intracerebral position of electrical equivalent dipole sources (EEDS) coupled with EEDS density rising in medial and basal regions of the cerebral hemisphere temporal lobes (by EEDS-tomography data). Alterations of the cortical-sub-cortical interactions show a decline in the brain activating system tone, a decrease in the neocortical inhibitory control of subcortical processes, and activation of structures of limbic and hypothalamic regions.

Clinical and statistical study of salivary gland adenoma.

The authors studied 100 patients with salivary gland adenomas for a period of ten years (from 1989 to 1999). Different types of adenomas regarding their glandular localization, clinical presentation, the age and the sex of the patients were studied. Different diagnostic methods were applied: medical history, clinical examination, sonography, scintigraphy, tomodensitometry, sialography, express morphological diagnosis and permanent histological preparation.

Plate osteosynthesis in the treatment of dislocated fractures of the condylar process of the mandible.

Condylar fractures present a significant management problem for the surgeon dealing with maxillofacial trauma patients. The main problems in the treatment of the dislocated fractures of the condylar process are: dislocation of the condyle, the delicate operative technique and difficult reposition of the condyle. The authors report a case of fractured and dislocated condylar process of the fabricated mandible which was osteosynthesized by plate.

[Instruments and probes for intracavitary pH measurement].

The modern clinical tasks, related with intracavitary pH-metry, are highly diversified. It is necessary to work out a whole series of instruments in order to meet the demands of both the practical and the scientific medicine in respect to pH-metry. Such designing of instruments must be based on an analysis of demands related with clinical tasks and with technical-and-economic factors.

[AGM-03: microprocessor gastric acidity meter].

The paper outlines an AGM-03 microprocessor acidogastrometer, a diagnostic device for direct measurement of acidity in the upper gastrointestinal tract (GIT). The AGM-03 device is cheapest among new-series acidogastrometers developed by the State Research and Production Enterprise "ISTOK-SISTEMA". It is intended for use at small hospitals and polyclinics when acid-dependent GIT processes are under study.