Electronic and optical properties of pristine, N- and S-doped water-covered TiO2 nanotube surfaces.

For rational design and improvement of electronic and optical properties of water-splitting photocatalysts, the ability to control the band edge positions relative to the water redox potentials and the photoresponse as a function of environmental conditions is essential. We combine ab initio molecular dynamics simulations with ab initio many-body theoretical calculations to predict the bandgap and band edge energies, as well as the absorption spectrum of pristine and N- and S-doped TiO2 nanotubes using the DFT+U and G0W0 approaches. Both levels of theory show similar trends, and N+S-codoping appears to be the optimal system for photocatalytic water splitting both in dry and humid conditions. However, the effect is rather moderate. Compared to DFT+U, the enhanced many-body effects in the G0W0 calculations push the absolute energies of the band edges to higher values and yield increased quasi-particle bandgaps in better agreement with experiment. In dry and humid conditions, the electronic bandgap for all systems is found to be in the range of 6.0-6.2 eV with a redshift from electronic gap to optical gap. The absorption spectra show an optical anisotropy and different absorption thresholds for different light polarizations.

[New data on nasal morphology and morphological structure of paranasal sinuses].

The authors summarize the results of investigations of specific anatomical features of paranasal sinuses in more than 12,000 subjects. The patients with suspected cerebral pathology and lesions in the paranasal sinuses were examined using computed tomography. Structural variants of ethmoid bone and ethmoidal labyrinth, nasal septum, maxillary, frontal, and sphenoidal sinuses are described. The morphometric analysis revealed the zonal relationship between different structures of nasal mucosa and the new variants of regulatory structures in the cavernous sinus vessels.

[Peculiarities of surgical interventions for the treatment of inflammatory and traumatic lesions in the frontal sinus].

This paper summarizes the experience with the treatment of 275 patients presenting with inflammatory diseases and traumatic lesions of the frontal sinus. Based on the results of the present study, recommendations have been developed designed to optimize surgical interventions for the enhancement of treatment efficiency and the prevention of relapses.

[Clinical and roentgenological manifestations of the silent sinus syndrome].

Analysis of the results of the examination and treatment of four patients presenting with the silent sinus syndrome provided materials for the generalized characteristic of clinical and roentgenological manifestations of this condition.

The electronic properties of an oxygen vacancy at ZrO(2)-terminated (001) surfaces of a cubic PbZrO(3): computer simulations from the first principles.

Combining B3PW hybrid exchange-correlation functional within the density functional theory (DFT) and a supercell model, we calculated from the first principles the electronic structure of both ideal PbZrO(3) (001) surface (with ZrO(2)- and PbO-terminations) and a neutral oxygen vacancy also called the F center. The atomic relaxation and electronic density redistributions are discussed. Thermodynamic analysis of pure surfaces indicates that ZrO(2) termination is energetically more favorable than PbO-termination. The O vacancy on the ZrO(2)-surface attracts approximately 0.3 e (0.7 e in the bulk PbZrO(3)), while the remaining electron density from the missing O(2-) ion is localized mostly on atoms nearest to a vacancy. The calculated defect formation energy is smaller than in the bulk which should lead to the vacancy segregation to the surface. Unlike Ti-based perovskites, the vacancy-induced (deep) energy level lies in PbZrO(3) in the middle of the band gap.

[Effects of the size and position of the anastomoses on pathological process in the paranasal sinuses]. / Vliiaiut li razmery i raspolozhenie soustii na kharakter patologicheskogo protsessa v okolonosovykh pazukhakh?

In small anastomoses of the paranasal sinuses blocking in inflammation we observe acute pyo-exudative inflammation; in large anastomoses--chronic productive form with development of the cysts and polyps. By the authors' experience, 8-10% of the population have no maxillary anastomosis in the crescentic fissure. It locates in the posterior part of its medial wall.

[On the impact of surgery on mucosal vessels of the turbinates (10 years of submucosal vasotomy)]. / O khirurgicheskom vozdeistvii na sosudy slizistoi obolochki nosovykh rakovin (k 10-letiiu operatsii podslizistoi vazotomii)]

The paper presents a detailed description of blood circulation in the mucosa of the turbinated bones (TB), cavernous plexuses of the conchae (CPC). The operation of submucous vasotomy is suggested basing on morphological features of CPC blood supply. The technique of the procedure is described. The results of this sparing surgery are available for 530 patients with hypertrophic and basomotor rhinitis.

The prolongation of drug action in the treatment of diseases of the nose and paranasal sinuses.

In order to prolong drug contact with the mucous membrane, and thus therapeutic action, cellulose polymers have been used. These polymers exert no toxic action on liver function. The release of the drug from the polymer depends on the degree of polymer viscosity. The use of drug-containing polymers in the treatment of nasal diseases and paranasal sinusitis is highly effective.

[Use of polymer-based drugs in the treatment of acute and chronic maxillary sinusitis]. / Ispol'zovanie lekarstvennykh veshchestv na polimernoi osnove dlia lecheniia ostrogo i khronicheskogo gaimorita.

The 5-year experience gained in the ENT hospital of the Kursk Medical Institute and the ENT department of the Central Hospital of the USSR Ministry of Health proved effective the use of polymer-based drugs in chemotherapy of acute and chronic maxillary sinusitis. The drugs carried by polymers were introduced into the maxillary sinus by puncture or drainage. As a rule, these are antibiotics or the latter in combination with hormones and enzymes. Drugs with addition of polymers can be produced in any pharmacy.