Hard X–ray Laue monochromator

Experimental studies of X-ray diffraction from reflecting atomic planes (1011) of X-cut quartz single crystal in Laue geometry influenced by the temperature gradient were carried out. It is shown that by using the temperature gradient it is possible to reflect a hard Xray beam with photon energy near the 100 keV with high efficiency. It has been experimentally proved that the intensity of the reflected beam can be increased by more than order depending on the value of the temperature gradient

Opto-Mechanical Pattern Formation in Cold Atoms

Transverse pattern formation in an optical cavity containing a cloud of cold two-level atoms is discussed. We show that density modulation becomes the dominant mechanism as the atomic temperature is reduced. Indeed, for low but achievable temperatures the internal degrees of freedom of the atoms can be neglected, and the system is well described by treating them as mobile dielectric particles. A linear stability analysis predicts the instability threshold and the spatial scale of the emergent pattern. Numerical simulations in one and two transverse dimensions confirm the instability and predict honeycomb and hexagonal density structures, respectively, for the blue and red detuned cases.Comment: submitted to Physical Review Letter

Hard X-ray laue monochromator

Experimental studies of X-ray diffraction from reflecting atomic planes (1011) of X-cut quartz single crystal in Laue geometry influenced by the temperature gradient were carried out. It is shown that by using the temperature gradient it is possible to reflect a hard Xray beam with photon energy near the 100 keV with high efficiency. It has been experimentally proved that the intensity of the reflected beam can be increased by more than order depending on the value of the temperature gradient

Инфаркт миокарда в послеродовом периоде

The study objective Is to present a clinical observation, describe the diagnostics and treatment of acute transmural myocardial infarction in a patient on the 8th day after childbirthMaterial and methods A 31-year-old patient was hospitalized 3 hours after the onset of the disease on the 8th day after urgent spontaneous delivery at 38-39 weeks of gestation with a clinic of acute myocardial infarction in the intensive care unit. Based on the data of anamnesis, complaints, physical examination, results of instrumental and laboratory examination, the following clinical diagnosis was made: ischemic heart disease: acute transmural myocardial infarction of the anterior wall, septum and apex of the left ventricle; atherosclerosis of the aorta and coronary arteries. On an emergency basis, the patient underwent coronary angiography, pronounced atherosclerotic changes in the coronary arteries were revealed: acute occlusion of the anterior interventricular artery in the middle third, stenosis of the diagonal branch up to 70% in the orifice, stenosis of the circumflex branch up to 70% in the middle third, extended stenosis up to 79% in the middle third of the right coronary artery.Results The patient underwent percutaneous coronary intervention (pci) on a symptom-dependent artery: mechanical recanalization and stenting of the anterior descending artery (ada) by a drug-eluting stent.Conclusion An increase in the incidence of acute coronary syndrome in pregnant women and postpartum women requires the development of an algorithm for additional examination of late reproductive age patients at the stage of pregnancy planning, in case of identification of possible risk factors for the development of cardiovascular diseases — observation of a cardiologist during pregnancy and in the postpartum period.Цель Представить клиническое наблюдение, описать диагностику и лечение острого трансмурального инфаркта миокарда у пациентки на 8-е сутки после родов.Материал и методы Пациентка 31 года, госпитализирована через 3 часа после начала заболевания на 8-е сутки после срочных самопроизвольных родов в 38–39 недель беременности с клиникой острого инфаркта миокарда в палату реанимации и интенсивной терапии. На основании данных анамнеза, жалоб, объективного осмотра, результатов инструментального и лабораторного обследования поставлен клинический диагноз: «Ишемическая болезнь сердца: острый трансмуральный инфаркт миокарда передней стенки, перегородки и верхушки левого желудочка; атеросклероз аорты и коронарных артерий». В экстренном порядке пациентке выполнена коронарография, и выявлены выраженные атеросклеротические изменения коронарных артерий: острая окклюзия передней межжелудочковой ветви в средней трети, стеноз диагональной ветви — до 70% в устье, cтеноз огибающей ветви — до 70% в средней трети, протяженный стеноз — до 79% в средней трети правой коронарной артерии.Результаты Больной было выполнено чрескожное коронарное вмешательство на симптом-зависимой артерии: механическая реканализация и стентирование передней нисходящей артерии стентом с лекарственным покрытием.Заключение Увеличение частоты острого коронарного синдрома у беременных и родильниц требует разработки алгоритма дополнительного обследования пациенток позднего репродуктивного возраста на этапе планирования беременности, а при выявлении факторов риска развития сердечно-сосудистых заболеваний — наблюдения кардиолога во время беременности и в послеродовом периоде

Clinical features of post-COVID-19 period. Results of the international register “Dynamic analysis of comorbidities in SARS-CoV-2 survivors (AKTIV SARS-CoV-2)”. Data from 6-month follow-up

Aim. To study the clinical course specifics of coronavirus disease 2019 (COVID-19) and comorbid conditions in COVID-19 survivors 3, 6, 12 months after recovery in the Eurasian region according to the AKTIV register. Material and methods.The AKTIV register was created at the initiative of the Eurasian Association of Therapists. The AKTIV register is divided into 2 parts: AKTIV 1 and AKTIV 2. The AKTIV 1 register currently includes 6300 patients, while in AKTIV 2 — 2770. Patients diagnosed with COVID-19 receiving in- and outpatient treatment have been anonymously included on the registry. The following 7 countries participated in the register: Russian Federation, Republic of Armenia, Republic of Belarus, Republic of Kazakhstan, Kyrgyz Republic, Republic of Moldova, Republic of Uzbekistan. This closed multicenter register with two nonoverlapping branches (in- and outpatient branch) provides 6 visits: 3 in-person visits during the acute period and 3 telephone calls after 3, 6, 12 months. Subject recruitment lasted from June 29, 2020 to October 29, 2020. Register will end on October 29, 2022. A total of 9 fragmentary analyzes of the registry data are planned. This fragment of the study presents the results of the post-hospitalization period in COVID-19 survivors after 3 and 6 months. Results. According to the AKTIV register, patients after COVID-19 are characterized by long-term persistent symptoms and frequent seeking for unscheduled medical care, including rehospitalizations. The most common causes of unplanned medical care are uncontrolled hypertension (HTN) and chronic coronary artery disease (CAD) and/or decompensated type 2 diabetes (T2D). During 3- and 6-month follow-up after hospitalization, 5,6% and 6,4% of patients were diagnosed with other diseases, which were more often presented by HTN, T2D, and CAD. The mortality rate of patients in the post-hospitalization period was 1,9% in the first 3 months and 0,2% for 4-6 months. The highest mortality rate was observed in the first 3 months in the group of patients with class II-IV heart failure, as well as in patients with cardiovascular diseases and cancer. In the pattern of death causes in the post-hospitalization period, following cardiovascular causes prevailed (31,8%): acute coronary syndrome, stroke, acute heart failure. Conclusion. According to the AKTIV register, the health status of patients after COVID-19 in a serious challenge for healthcare system, which requires planning adequate health system capacity to provide care to patients with COVID-19 in both acute and post-hospitalization period

Kinetic theory for transverse optomechanical instabilities

We investigate transverse symmetry-breaking instabilities emerging from the optomechanical coupling between light and the translational degrees of freedom of a collisionless, damping-free gas of cold, two-level atoms. We develop a kinetic theory that can also be mapped on to the case of an electron plasma under ponderomotive forces. A general criterion for the existence and spatial scale of transverse instabilities is identified; in particular, we demonstrate that monotonically decreasing velocity distribution functions are always unstable

AML/MDS with 11q/MLL amplification show characteristic gene expression signature and interplay of DNA copy number changes

AML/MDS patients carrying 11q amplifications involving the mixed lineage leukemia gene (MLL) locus are characterized by a complex aberrant karyotype (CAK) frequently including deletions within 5q, 17p, and 7q, older age and fast progression of the disease with extremely poor prognosis. MLL has been shown to be overexpressed in cases with 11q amplification. However, in most of the cases, the amplified region is not restricted to the MLL locus. In this study, we investigated 19 patients with AML/MDS and MLL gain/amplification. By means of array CGH performed in 12 patients, we were able to delineate the minimal deleted regions within 5q and 17p and identified three independent regions 11q/I-III that were amplified in all cases. Gene expression profiles established in 15 cases were used to identify candidate genes within these regions. Notably, analysis of our data suggests a correlation of loss of 5q and 17p and expression of genes present in 11q23-25. Furthermore, we demonstrate that the gene expression signature can be used to discriminate AML/MDS with MLL amplification from several other types of AML