Optical Absorption and Raman Spectroscopy Study of the Fluorinated Double-Wall Carbon Nanotubes

Double-wall carbon nanotube (DWNT) samples have been fluorinated at room temperature with varied concentration of a fluorinating agent BrF3. Content of the products estimated from X-ray photoelectron data was equal to CF0.20 and CF0.29 in the case of deficit and excess of BrF3. Raman spectroscopy showed considerable decrease of carbon nanotube amount in the fluorinated samples. Analysis of optical absorption spectra measured for pristine and fluorinated DWNT samples revealed a selectivity of carbon nanotube fluorination. Nanotubes with large chiral angle are more inert to the fluorinating agent used

NOVOSIBIRSK REGION PROGRAM OF THE LIVER TRANSPLANTATION IN CHILDREN

The aim of the study was to analyze the early and late outcomes of pediatric liver transplantation (LTx) program in the Novosibirsk region. Material and Methods. The retrospective study included 24 patients aged 72 ± 74.8 months (from 4 to 212 months, median – 20 months) with a body weight of 21.7 ± 18.1 kg (from 4.5 to 55 kg, median – 12.5 kg). Two (8.3 %) cadaveric whole liver grafts, 19 (79.2 %) living donor liver grafts, and 3 (12.5 %) cadaveric liver fragments (reduced-size or split-liver) were transplanted. Results. The features of vascular and biliary reconstruction in different types of LTx are discussed. The incidence of vascular and biliary complications was 8.3 and 20.8%, respectively. The patients stayed in the intensive care unit for 9 ± 5.1 days (from 4 to 22 days, median 8 days) and total length of hospital stay was for 40 ± 25.4 days (from 19 to 136 days, median 32 days). Two (8.3 %) recipients had early graft dysfunction. Perioperative mortality (up to 90 days) was absent. The overall 5-year patient and graft survival rates were 95 and 88 %, respectively. Conclusion. The Novosibirsk region has a pediatric LTx program with outcomes comparable to the data of the leading world and Russian centers

CHRONIC MYELOID LEUKEMIA: EPIDEMIOLOGY AND FIFTEENTH YEARS OF THERAPY IN THE NOVOSIBIRSK REGION

The incidence of chronic myeloid leukemia from 2004 to 2018 amounted to 0.63 per 100 000 people per year. The prevalence of chronic myeloid leukemia over the past 15 years has increased from 1.88 to 7.02 case per 100 000 people. We have analyzed the therapy outcomes of chronic myeloid leukemia of patients, received imatinib treatment for more than 12 month (165 patients). Complete hematologic response is attained in 88.5 % cases (146 patients), complete cytogenetic response (CCR) (ph+<0 %) – in 72.1 % cases (119 patients), major molecular response (MMR) – in 50.3 % cases (83 patients). The primary resistance to imatinib is observed in 21.8 % cases (36 patients), secondary – in 6.1 % cases (10 patients – 7 patients have lost the complete hematologic response and CCR and 3 patients have lost the CCR and MMR). The thirteen patients of those, who have primary or secondary resistance to imatinib have been treated with second-generation tyrosine kinase inhibitors (nilotinib, dasatinib) and in 93,3 % cases (14 patients) CCR have been obtained, 10 patients (66.7 %) have attained the CCR and 9 patients (60 %) have achieved MMR. Among all those patients treated with I and II generations tyrosine kinase inhibitors, we have carried out the overall survival (OS) analysis and obtained following results: the median of OS have not been achieved, 5-year OS rate is estimated as 90 %, 10-year OS rate – more than 77 %, calculated 15-year OS – more than 60 %

Theoretical Study of the Methanol Dehydrogenation on Platinum Nanocluster

Методом функционала плотности изучена реакция дегидрирования метанола по механизму разрыва O-H-связи на нанокластере платины Pt79, проведено сравнение с идеальной поверхностью Pt(111). Найдено, что наиболее устойчивые комплексы образуются при адсорбции COНх (x = 1-4) частиц на низкокоординированных атомах нанокластера Pt79, при этом такой предпочтительности для атомов Н не обнаружено. Абсолютные значения энергии адсорбции на вершинах и ребрах нанокластера Pt79 выше на 0,2–0,7 эВ, чем на высококоординированных центрах регулярной поверхности Pt(111). Стабильность адсорбционных комплексов на поверхности нанокластера уменьшается от вершин к ребрам и затем к центру граней (111) нанокластера. Анализ энергетического профиля реакции показывает, что тепловой эффект образования ключевого интермедиата CH3O на кластере Pt79 становится нулевым в отличие от эндотермического (0,5 эВ) на регулярной поверхности Pt(111). Экзотермический эффект всех остальных реакционных стадий, за исключением десорбции СО, на нанокластере увеличивается на ~0,2-0,5 эВThe methanol dehydrogenation through the initial breaking of the O-H bond at Pt79 nanoparticle was studied with the DFT method. The comparison with an ideal surface of Pt (111) was carried out. The most stable complexes were found for COНх (x = 1-4) species adsorbed at low-coordinated atoms of nanocluster Pt79, whereas no preference for adsorption at corners and edges for Н atoms was found. The absolute adsorption energies of COНх species at corner and edge sites of platinum nanocluster increased by 0.2–0.7 eV in comparison with high-coordinated sites of the regular Pt(111) surface. The stabilization effect of adsorption at the nanoparticle decreases from corners to edges and then to the center of (111) facet. According to the reaction energy profile, the thermal effect of the formation of CH3O at the nanocluster becomes close to zero, in contrast to the endothermic effect (0.5 eV) on the regular Pt(111) surface. The exothermic effects for other reaction stages at the platinum nanocluster, excluding CO desorption, increase by ~0.2-0.5 e

Career guidance as a priority in solving the personnel problem in healthcare

Over the past two decades, the availability of medical personnel in Russia’s healthcare sector has continued to deteriorate. Over the period from 2000 to 2018, it decreased by about 11 % for both doctors and specialists with secondary medical education. This is due to several reasons: the rejection of the previously existing system of training and saturation of the industry with specialists, the unsuccessful optimization of the country’s health system, the lack of attention of the authorities to young professionals, the creation of favorable conditions for them to live and work, etc. An important role is played by insufficient work on career guidance, including in medical specialties with students of General education organizations and the reluctance of medical workers to do this. The article provides recommendations for the organization of career guidance among high school students, describes the forms in which it can be carried out. This includes specialized medical classes, clubs for studying the basics of medical knowledge, and volunteering. The experience of the regional clinical hospital, which for 5 years has been supervising a specialized medical class, 78–96 % of whose graduates have chosen the medical profession is of considerable interest. Teachers of the Novosibirsk Medical College actively work with General education organizations, and therefore the competition among applicants is from 2 people per place in the specialty «Nurse» to 12–14 in the specialties «Pharmacy» and «Orthopedic dentistry». The effectiveness of career guidance largely depends on how systematically and methodically it is carried out. To successfully conduct it, you need to organize a three-level system: career guidance office (level I), career guidance point (level II), career guidance center (level III). The joint work of representatives of General education and medical organizations, medical schools, will help to ensure that school graduates will come to medicine, confident in the correctness of their chosen profession. After graduation, they will return to their native land, to their familiar environment, and with a high degree of probability will remain there forever