The balance of elements in the system “Luvic Chernozems – agricultural plants” on the Plavsk upland (Tula region of Russia)

To assess the transfer of macro (K, P, S, Mg, Ca, as well as Si, Na, Fe, Al, Mn and Ti) and microelements (Zn, Ba, Cu, Sr, Mo, as well as As, Zr, Pb, Co, Ni, V and Cr) from Luvic Chernozems (Aric, Loamic, Pachic) into agricultural plants, we studied the inventories of chemical elements in three agrocenoses (wheat, soybean, Galega orientalis Lam. and Bromopsis inermis Leyss grass mixtures) from the Plavsk upland (Tula Region). This territory is subjected to intensive industrial and agricultural impacts: it is 40 km away from the town of Shchekino with a nitrogen fertilizer plant and a thermal power plant, 60 km away from Tula with large metallurgical enterprises, 70 km away from the town of Novomoskovsk with several chemical enterprises and state district power plant. In soils, the total content of elements was determined by the X-ray fluorescence spectrometry. The elemental composition of plants after autoclave decomposition with a mixture of concentrated nitric acid and hydrogen peroxide and the content of the bioavailable fraction (extracted by an ammonium acetate buffer with pH 4.8) of elements in soil were estimated by the atomic emission spectrometry with inductively coupled plasma. In topsoil (a 10-cm layer), maximal inventories are typical for total Si (40 ± 4 kg/m2), Al (7.0 ± 0.8 kg/m2) and Fe (3.4 ± 0.3 kg/m2) and for bioavailable Ca (570 ± 48 g/m2), Mg (43 ± 4 g/m2), K (22 ± 6 g/m2). In plants, the main inventories (g/m2) of K, P, S, Mg, Si, Mn, Zn, Ba, Cu, Mo occur in the above ground phytomass. The most effectively plants assimilate bioavailable fractions of K, P, Ti, Mo, As, Zr, V. Based on the resource method for soil quality assessment, the studied Chernozems are characterized by a low level of Ni contamination, a moderate supply of bioavailable K with a lack of bioavailable P

Случай манифестации острого миелоидного лейкоза у подростка на фоне коронавирусной инфекции COVID-19

This clinical case describes the manifestation of acute myeloid leukemia (AML) against the backdrop of severe COVID-19 infection in a teenage patient. The patient’s examination data, medical history, and available scientific literature on the relationship between COVID-19 and leukemia manifestation were studied and analyzed. COVID-19 infection in the context of AML was severe, with respiratory failure and involvement of more than 90% of the lungs according to computed tomography data. Changes observed in peripheral blood did not have specific alterations and only indirectly indicated an unfavorable premorbid background. This clinical case reflects the likelihood of the simultaneous presence of COVID-19 and other acute severe illnesses.Данный клинический случай описывает манифестацию острого миелоидного лейкоза на фоне тяжелого течения коронавирусной инфекции COVID-19 у пациентки подросткового возраста. Изучены и проанализированы данные обследований пациентки, анамнез жизни и заболевания, произведен анализ имеющейся научной литературы, посвященной взаимосвязи COVID-19 с манифестацией лейкоза. Коронавирусная инфекция COVID-19 на фоне острого миелоидного лейкоза протекала в тяжелой форме, с дыхательной недостаточностью и вовлечением в патологический процесс более 90% лёгких по данным компьютерной томографии. Изменения, наблюдаемые в периферической крови, не имели специфических изменений и лишь косвенно указывали на неблагоприятный преморбидный фон. Клинический случай отражает вероятность существования одновременно коронавирусной инфекции COVID-19 и других острых тяжелых заболеваний

HIV-associated tuberculosis: the course of the tuberculosis process and efficacy of treatment (Review)

Currently, despite the decline in the incidence and mortality of tuberculosis, the epidemic situation around the world, including in Russia, remains tense for tuberculosis. One of the reasons for this is an increase in the number of patients with HIV infection, which is a risk factor for tuberculosis. The combination of tuberculosis and HIV infection in recent years has turned into one of the most significant and urgent health problems. The review provides data on the prevalence of tuberculosis associated with HIV infection both in the world and in the Russian Federation, and the most comprehensive survey of scientific studies devoted to the study of the clinical and radiological and laboratory manifestations of tuberculosis in patients with HIV infection is presented. In addition, literature data on the efficacy of treatment of tuberculosis in this category of patients are given.В настоящее время несмотря на снижение заболеваемости и смертности по туберкулезу эпидемическая ситуация во всем мире, в том числе и в России остается напряженной. одной из причин этого является рост числа больных с ВИЧ-инфекцией, которая является фактором риска развития туберкулеза. Сочетание туберкулеза и ВИЧ-инфекции в последние годы превратилось в одну из самых значимых и актуальных проблем здравоохранения. В обзоре приведены данные о распространенности туберкулеза, сочетанного с ВИЧ-инфекцией как в мире, так и в российской Федерации, представлен наиболее полный обзор научных исследований, посвященных изучению особенностей клинико-рентгенологических и лабораторных проявлений туберкулеза при его сочетании с ВИЧ-инфекцией. кроме того, приведены данные литературы об эффективности лечения туберкулеза у этой категории пациентов

Pulsations and Long-Term Light Variability of Three Candidates to Protoplanetary Nebulae

We present new photometric data and analysis of the long-duration UBV photoelectric observations for three candidates to protoplanetary objects - F-supergiants with IR-excesses located at large galactic latitudes, IRAS 18095+2704, IRAS 19386+0155, and IRAS 19500-1709. All three stars have revealed quasiperiodic low-amplitude variabilities caused by pulsations observed against the long-term trends of brightnesses. For IRAS 18095+2704=V887 Her we have found a pulsation period of 109 days and a linear trend of brightness under the constant colours if being averaged over the year timescale. The light curve of IRAS 19386+0155=V1648 Aql over 2000-2008 can be approximated by a wave with a main period of 102 days which is modulated by close frequency, with a period of 98 days, that results in brightness oscillations with a variable amplitude. V1648 Aql has also shown synchronous reddening together with a persistent rise of brightness in the V-band. IRAS 19500-1709=V5112 Sgr experiences irregular pulsations with the periods of 39 and 47 days. The long-term component of the variability of V5112 Sgr may be related to the binary character of this star.Comment: 11 pages, 6 figures, accepted for publication in Pis'ma Astron. Z

ВЕДЕНИЕ БЕРЕМЕННОСТИ, РОДОВ И ПОСЛЕРОДОВОГО ПЕРИОДА У ПАЦИЕНТКИ С ЛЕКАРСТВЕННО-УСТОЙЧИВЫМ, ДЕСТРУКТИВНЫМ ТУБЕРКУЛЕЗОМ ЛЕГКИХ ПОСЛЕ ЭТАПНОГО ХИРУРГИЧЕСКОГО ЛЕЧЕНИЯ

The article describes a clinical case of the successful management of pregnancy, delivery and post-natal period in the female patient with fibrous cavernous tuberculosis with extensive drug resistance and multiple thoracic surgeries in the past. This clinical case demonstrates that it is possible for a mother with the advanced form of tuberculosis to give birth to a healthy mature newborn.Представлено клиническое наблюдение успешного ведения беременности, родов и послеродового периода у пациентки с фиброзно-кавернозным туберкулезом с широкой лекарственной устойчивостью возбудителя и многократными торакальными операциями в анамнезе. Показана возможность рождения здорового доношенного ребенка у матери с тяжелой формой туберкулеза

Etiology of influenza-like illnesses in the population of Novosibirsk city in the 2018–2019 epidemic season

Influenza and other acute respiratory viral infections lead to a substantial incidence of severe cases and hospitalizations and so remain a global health problem. Within the frame of the Global Influenza Hospital Surveillance Network (GIHSN), we assessed the contribution of influenza and other respiratory viruses to severe cases of influenzalike diseases in patients hospitalized to the Novosibirsk infectious hospitals in the years 2018–2019. We analyzed 484 nasopharyngeal swabs collected from patients admitted to the hospitals with acute respiratory infections (ARI) using real-time polymerase chain reaction commercial kits. We confirmed viral etiology of ARI in 69.8% cases. Influenza viruses were detected in 47.1% cases, wherein concomitant circulation of influenza A(H1N1)pdm09 and A(H3N2) viruses was observed in 20.7% and 26% of patients, respectively, whereas influenza B virus was detected only in one sample. All analyzed influenza A viruses were antigenically similar to vaccine strains. Genetically, the Novosibirsk strains were closely related to influenza A viruses distributed in Russia and worldwide. Influenza A(H1N1)pdm09 virus was detected in all patients aged 0 to 14 years and required intensive care. Other respiratory viruses were detected in 36.4% of children and 5.8% of adults, and 8.3% of children had viral coinfection, whereas no cases of coinfection were detected in adults. The most common viruses in children were metapneumovirus — 12.8%, rhinovirus — 9.3% and respiratory syncytial virus — 8.0%. In adults, metapneumovirus, adenovirus, parainfluenza virus and rhinovirus were detected with a detection rate no exceeding 2%. In this study, we found no differences in the detection rate of the influenza virus due to concomitant chronic diseases, pregnancy, or smoking habits. At the same time, the detection rate of other respiratory viruses in non-smokers vs. smokers was significantly lower than in smokers and former smokers (26.15%, 66.67% and 62.50%, respectively). In addition, the level of detection of respiratory viruses in children with vs. without chronic pathology was significantly higher (55.3% and 38.7%, respectively). Thus, our and similar studies are important for monitoring and control of the infection

Low voltage control of exchange coupling in aferromagnet-semiconductor quantum well hybridstructure

Voltage control of ferromagnetism on the nanometer scale is highly appealing for the development of novel electronic devices with low power consumption, high operation speed, reliable reversibility and compatibility with semiconductor technology. Hybrid structures based on the assembly of ferromagnetic and semiconducting building blocks are expected to show magnetic order as a ferromagnet and to be electrically tunable as a semiconductor. Here, we demonstrate the electrical control of the exchange coupling in a hybrid consisting of a ferromagnetic Co layer and a semiconductor CdTe quantum well, separated by a thin non-magnetic (Cd,Mg)Te barrier. The electric field controls the phononic ac Stark effect—the indirect exchange mechanism that is mediated by elliptically polarized phonons emitted from the ferromagnet. The effective magnetic field of the exchange interaction reaches up to 2.5 Tesla and can be turned on and off by application of 1V bias across the heterostructure