[Technical features of laparoscopic cholecystectomy in patients with overweight and obesity]. / Laparoskopicheskaia kholetsistéktomiia u patsientov s izbytochnoi massoi tela.

AIM: To improve surgical treatment of patients with cholelithiasis and obesity by using of different technologies of laparoscopic cholecystectomy. MATERIAL AND METHODS: There were 88 (16.4%) patients with overweight and obesity among 538 patients who underwent laparoscopic cholecystectomy. Conventional laparoscopic cholecystectomy was performed in 33 (6.1%) cases, cholecystectomy through single laparoscopic access - in 12 (2.3%), cholecystectomy via single laparoscopic access with trocar support - in 43 (8.0%) patients with body mass index 25-52.3 kg/m2. The article describes the technical features of laparoscopic cholecystectomy. RESULTS: Complications were absent in 83 (94.3%) of 88 cases after laparoscopic cholecystectomy. The lowest pain severity in early postoperative period was noted in case of single laparoscopic access (p<0.05). CONCLUSION: Conventional and single-port laparoscopic cholecystectomy is advisable in patients with calculous cholecystitis, overweight and obesity.

Adsorption energies and prefactor determination for CH3OH adsorption on graphite.

In this paper, we have studied adsorption and thermal desorption of methanol CH3OH on graphite surface, with the specific aim to derive from experimental data quantitative parameters that govern the desorption, namely, adsorption energy Eads and prefactor ν of the Polanyi-Wigner law. In low coverage regime, these two values are interconnected and usually the experiments can be reproduced with any couple (Eads, ν), which makes intercomparison between studies difficult since the results depend on the extraction method. Here, we use a method for determining independently the average adsorption energy and a prefactor value that works over a large range of incident methanol coverage, from a limited set of desorption curves performed at different heating rates. In the low coverage regime the procedure is based on a first order kinetic law, and considers an adsorption energy distribution which is not expected to vary with the applied heating rate. In the case of CH3OH multilayers, Eads is determined as 430 meV with a prefactor of 5 × 10(14) s(-1). For CH3OH submonolayers on graphite, adsorption energy of 470 ± 30 meV and a prefactor of (8 ± 3) × 10(16) s(-1) have been found. These last values, which do not change between 0.09 ML and 1 ML initial coverage, suggest that the methanol molecules form island-like structure on the graphite even at low coverage.

Wavelength resolved UV photodesorption and photochemistry of CO2 ice.

Over the last four years we have illustrated the potential of a novel wavelength-dependent approach in determining molecular processes at work in the photodesorption of interstellar ice analogs. This method, utilizing the unique beam characteristics of the vacuum UV beamline DESIRS at the French synchrotron facility SOLEIL has revealed an efficient indirect desorption mechanism that scales with the electronic excitations in molecular solids. This process, known as DIET--desorption induced by electronic transition--occurs efficiently in ices composed of very volatile species (CO, N2), for which photochemical processes can be neglected. In the present study, we investigate the photodesorption energy dependence of pure and pre-irradiated CO2 ices at 10-40 K and between 7 and 14 eV. The photodesorption from pure CO2 is limited to photon energies above 10.5 eV and is clearly initiated by CO2 excitation and by the contribution of dissociative and recombination channels. The photodesorption from "pre-irradiated" ices is shown to present an efficient additional desorption pathway below 10 eV, dominating the desorption depending on the UV-processing history of the ice film. This effect is identified as an indirect DIET process mediated by photoproduced CO, observed for the first time in the case of less volatile species. The results presented here pinpoint the importance of the interconnection between photodesorption and photochemical processes in interstellar ices driven by UV photons having different energies.