Trivalent zirconium and hafnium ions in yttria-based transparent ceramics

Electron paramagnetic resonance spectra of transparent yttria-based ceramics with zirconium and hafnium additives contain signals with close parameters due to paramagnetic Zr3+ and Hf3+ ions, which have similar ground-state electron configurations of [Kr]4d 1 and [Xe]5d 1, respectively. © 2013 Pleiades Publishing, Ltd

The health in the value system of Russian youth: contradictory discursive practices

The axiological aspects of the self-preserving behaviour of Russian youth are considered on the basis of the data of sociological studies. The contradiction between the high value of health in the minds of modern youth declared and the underdevelopment of daily practices aimed at its preservation and strengthening is revealed. The probable causes of the contradiction are listed; they are related as to the specifics of this socio-demographic group, to its hedonistic orientation, to situational orientation of thinking, and also to the limited capacity of youth in relation to receiving medical and preventive service

Complex neuroimaging study of the proximal segment after rigid fixation and dynamic stabilization in patients with degenerative lumbar disease

Background. The development of the adjacent level syndrome and, as a consequence, adjacent segment degenerative disease are currently the most common complications of decompression and stabilization surgery with the development of segmental instability. The aim of the study. To conduct a comprehensive neuroimaging assessment of  the proximal adjacent segment after rigid fixation and dynamic stabilization in degenerative lumbar disease. Materials and methods. We conducted a prospective multicenter study of the results of surgical treatment of 274 patients with degenerative-dystrophic diseases of the lumbar spine, who underwent monosegmental decompression and stabilization surgery using the TLIF (transforaminal lumbar interbody fusion) technique and open transpedicular rigid fixation, as well as open hemilaminectomy with stabilization of the operated segments with nitinol rods. The study included radiography, diffusion-weighted magnetic resonance imaging and computed tomography (dualenergy mode) of intervertebral discs and isolated facet degeneration of the upper adjacent level. Results and discussion. Combination of the initial proximal segment degeneration in the form of  facet joints degeneration (density of cartilaginous plate  – 163.5 ± 14.2 HU, density of external facet – 709.35 ± 13.6 HU, density of internal facet – 578.1  ±  12.1  HU), Pfirrmann III, IV  grade degeneration of intervertebral disc and a measured diffusion coefficient of less than 1300 mm2/s cause high risks of developing adjacent segment degenerative disease, which regulates the use of monosegmental dynamic fixation with nitinol rods, or preventive rigid fixation of the adjacent segment. Conclusion. Using complex neuroimaging in the preoperative period makes it possible to predict the results of surgical treatment, take timely measures to prevent degenerative diseases of the adjacent segment, and to carry out dynamic monitoring of processes in the structures of the spinal motion segment

Magnetism and temperature dependence of nano-TiO2: Fe EPR spectra

Nanocrystalline TiO2 samples of various compositions (up to 5 at.% Fe) with anatase structure and an average particle size of about 20 nm were synthesized using sol-gel technology. The magnetic properties of nano-TiO2: Fe was studied by electron paramagnetic resonance (EPR) and Faraday balance. The existence of an inhomogeneous magnetic state in TiO2: Fe samples of different compositions were revealed by EPR spectroscopy in a wide temperature range. The analysis of the EPR spectra in the L -, X - and Q-bands allowed us to calculate the quadratic fine structure (D, E) parameters, “axial” and “rhombic” ones, respectively. The value of D turned out to be quite small, which indicates an insignificant anisotropy, which can be ignored describing the magnetic properties of TiO2:Fe. It was shown that the temperature behavior of different separate components of the integral EPR spectra can be qualitatively interpreted in the model of coexistence in the TiO2: Fe system, mainly, dimers with a strong negative exchange interaction and isolated paramagnetic centers. No ferromagnetic state in TiO2: Fe-based samples after etching of aE-prepared state were detected. © 202

Характеристика поствакцинального иммунитета у студентов, вакцинированных против гепатита В на первом году жизни

Most researchers agree that the level of protective anti-HBs decreases with age after 3-fold immunization in the first year of life, which requires the introduction of a booster dose at least 5—7 years after the completed vaccination. It is necessary to continue monitoring those vaccinated against hepatitis B in the first year of life, including those from occupational risk groups.Objective: to assess the frequency and level of anti-HBs 18 or more years after the completed course of vaccination against hepatitis B according to the standard scheme in the first year of life and to identify risk groups that need revaccination.Of 116 donor students in Moscow, 18—22 years after the completed course of vaccination against hepatitis B according to the standard scheme carried out in the first year of life, in 42.3% of cases, the titer of specific antibodies was determined below the protective level (< 10 mME/ml). At the same time, the share of seronegative individuals among medical students was higher (52.8%). Of 116 donor students, in 38.8% of cases, the titer of protective antibodies was determined in low (10—100 mME/ml) and only in 13.8% — in high (100—1000 mME/ml) and in 5.2% — very high (> 1000 mME/ml) values. Markers of DNA HBV, HBsAg, and anti-HBcor were not detected in any cases. Medical students primarily need a revaccination against hepatitis B without a preliminary study of the initial titers of specific antibodies.Большинство исследователей сходятся во мнении о снижении уровня протективных anti-HBs с возрастом после 3-х кратной иммунизации на первом году жизни, что требует введения бустерной дозы минимум через 5—7 лет после законченной вакцинации. Необходимо продолжать наблюдения за вакцинированными против гепатита В на первом году жизни, в т.ч. из групп профессионального риска. Цель: оценить частоту и уровень анти-HBs через 18 и более лет после законченного курса вакцинации против гепатита В по стандартной схеме на первом году жизни и определить группы риска, нуждающиеся в ревакцинации.Результаты. Из 116 студентов-доноров г. Москвы через 18—22 года после законченного курса вакцинации против гепатита В по стандартной схеме, проведенной на первом году жизни, в 42,3% случаев титр специфических антител определялся ниже протективного уровня (< 10 мМЕ/мл). При этом среди студентов-медиков доля серонегативных лиц была выше (52,8%). Из 116 студентов-доноров в 38,8% случаев титр протективных антител определялся в низких (10—100 мМЕ/мл) и лишь у 13,8% — в высоких (100—1000 мМЕ/мл) и у 5,2% — очень высоких (>1000 мМЕ/мл) значениях. Маркеры инфицирования ДНК ВГВ, HBsAg и анти-НВсor не были обнаружены ни в одном случае. Студенты-медики в первую очередь нуждаются в ревакцинации против гепатита В без предварительного исследования исходных титров специфических антител

Предикторы тяжелых форм ротавирусной инфекции у детей

Rotavirus infection (RVI) is one of the most common childhood diseases. The study of predictors of severe forms of this disease is of undoubted interest.Aim. Based on the study of the characteristics of the premorbid background, life history and clinical and laboratory parameters, determine predictors of severe forms of RVI.Patients and methods. In the departments of intestinal infections and resuscitation and intensive care of Pediatric Research and Clinical Center for Infectious Diseases in the period 2018 – 202. a retrospective study of 962 children aged 2 months to 2 years with rotavirus infection was carried out. he severity of the condition was assessed using the Clarke scale. To identify the most significant predictors of the development of severe forms of RVI, two groups of patients were compared: severe (> 16 points) and moderate (≤16 points) forms of RVI. Comparison of the frequency of occurrence of signs in the groups was performed using the Pearson χ2 test and Fisher’s exact method. The forecasting model was developed using discriminant analysis of the statistical package Statistica for Windows.Results. Severe forms of RVI were detected in 65 children. Among the patients with severe forms of RVI, there were no patients with completed preventive vaccination. Patients with severe forms of RVI were admitted to the hospital in the late stages of the disease and had a higher score on the CDS scale. Based on the research carried out, a model for predicting severe forms of RVI was developed. The features included in the model were: the day of illness at admission, the patient’s age, prehospital prescription of antibacterial drugs, the absence of completed vaccination against RVI, and the severity of dehydration. Assessment of the quality of the created model showed that the classification ability was 97.7%.Conclusion. Predictors of severe forms of RVI include admission to a hospital in the late stages of the disease with severe dehydration, early age, prehospital antibiotics and forced transfer to artificial feeding, and absence of completed prophylactic vaccination.Ротавирусная инфекция является одним из наиболее распространённых заболеваний детского возраста. Несомненный интерес представляет изучение предикторов тяжёлых форм данного заболевания.Цель. На основании изучения особенностей преморбидного фона, анамнеза жизни и клинико-лабораторных параметров определить предикторы тяжелых форм ротавирусной инфекции.Материалы и методы. В отделениях кишечных инфекций и реанимации и интенсивной терапии Детского научно-клинического центра инфекционных болезней в период 2018–2021 гг. проведено ретроспективное исследование 962 детей от 2 месяцев до 2 лет с ротавирусной инфекцией. Тяжесть состояния оценивали с использованием шкалы Кларка. Для выявления наиболее значимых предикторов развития тяжелых форм ротавирусной инфекции были сопоставлены две группы пациентов: тяжелые (>16 баллов) и среднетяжелые (≤16 баллов) формы ротавирусной инфекции. Сравнение частоты встречаемости признаков в группах выполняли с помощью χ2 -критерия Пирсона и точного метода Фишера. Разработку модели прогнозирования осуществляли с помощью дискриминантного анализа статистического пакета Statistica for Windows.Результаты. Тяжелые формы ротавирусной инфекции были выявлены у 65 детей. Среди пациентов с тяжелыми формами ротавирусной инфекции не было ни одного пациента с завершённой профилактической вакцинацией. Пациенты с тяжелыми формами ротавирусной инфекции поступали в стационар на поздних сроках заболевания и имели более высокий балл по шкале CDS. На основании проведённых исследований была разработана модель прогнозирования тяжелых форм ротавирусной инфекции. Признаками, включенными в модель, оказались: день болезни при поступлении, возраст пациента, догоспитальное назначение антибактериальных препаратов, отсутствие завершенной вакцинации от ротавирусной инфекции, выраженность дегидратации. Оценка качества созданной модели показала, что классификационная способность составила 97,7%.Заключение. К предикторам тяжелых форм ротавирусной инфекции можно отнести поступление в стационар на поздних сроках болезни с тяжелой дегидратацией, ранний возраст, догоспитальное назначение антибиотиков и вынужденный перевод на искусственное вскармливание, а также отсутствие завершенной профилактической вакцинации.