The CoESCA station at BESSY: Auger electron–photoelectron coincidences from surfaces demonstrated for Ag MNN

In this work, we present the CoESCA station for electron–electron coincidence spectroscopy from surfaces, built in a close collaboration between Uppsala University and Helmholtz-Zentrum Berlin at the BESSY II synchrotron facility in Berlin, Germany. We start with a detailed overview of previous work in the field of electron–electron coincidences, before we describe the CoESCA setup and its design parameters. The system is capable of recording shot-to-shot resolved 6D coincidence datasets, i.e. the kinetic energy and the two take off angles for both coincident electrons. The mathematics behind extracting and analysing these multi-dimensional coincidence datasets is introduced, with a focus on coincidence statistics, resulting in fundamental limits of the signal-to-noise ratio and its implications for acquisition times and the size of the raw data stream. The functionality of the CoESCA station is demonstrated for the example of Auger electron–photoelectron coincidences from silver surfaces for photoelectrons from the Ag 3d core levels and their corresponding MNN Auger electrons. The Auger spectra originating from the different core levels, 3d and 3d could be separated and further, the two-hole state energy distributions were determined for these Auger decay channels

Weak Decays Beyond Leading Logarithms

We review the present status of QCD corrections to weak decays beyond the leading logarithmic approximation including particle-antiparticle mixing and rare and CP violating decays. After presenting the basic formalism for these calculations we discuss in detail the effective hamiltonians for all decays for which the next-to-leading corrections are known. Subsequently, we present the phenomenological implications of these calculations. In particular we update the values of various parameters and we incorporate new information on m_t in view of the recent top quark discovery. One of the central issues in our review are the theoretical uncertainties related to renormalization scale ambiguities which are substantially reduced by including next-to-leading order corrections. The impact of this theoretical improvement on the determination of the Cabibbo-Kobayashi-Maskawa matrix is then illustrated in various cases.Comment: 229 pages, 32 PostScript figures (included); uses RevTeX, epsf.sty, rotate.sty, rmpbib.sty (included), times.sty (included; requires LaTeX 2e); complete PostScript version available at ftp://feynman.t30.physik.tu-muenchen.de/pub/preprints/tum-100-95.ps.gz or ftp://feynman.t30.physik.tu-muenchen.de/pub/preprints/tum-100-95.ps2.gz (scaled down and rotated version to print two pages on one sheet of paper

ТРУДНОСТИ ДИАГНОСТИКИ ЭНТЕРОВИРУСНОЙ ИНФЕКЦИИ У РЕБЕНКА ГРУДНОГО ВОЗРАСТА И КЛИНИКО-МОРФОЛОГИЧЕСКИЕ СОПОСТАВЛЕНИЯ

This paper describes a clinical case of intrauterine generalized enterovirus infection in infant 2 months with fatal outcome. Hematologic features (lymphocytic leikemoid reaction), difficulties of diagnostics and treatment, results of autopsy are presents. В статье описывается наблюдение внутриутробной генерализованной энтеровирусной инфекции у ребенка 2 мес. с летальным исходом. Представлены гематологические особенности инфекции (лимфоцитарная лейкемоидная реакция), трудности диагностики и терапии заболевания, результаты аутопсии.

Fermi surface tomography

Fermi surfaces are essential for predicting, characterizing and controlling the properties of crystalline metals and semiconductors. Angle-resolved photoemission spectroscopy (ARPES) is the only technique directly probing the Fermi surface by measuring the Fermi momenta (k(F)) from energy- and angular distribution of photoelectrons dislodged by monochromatic light. Existing apparatus is able to determine a number of k(F) -vectors simultaneously, but direct high-resolution 3D Fermi surface mapping remains problematic. As a result, no such datasets exist, strongly limiting our knowledge about the Fermi surfaces. Here we show that using a simpler instrumentation it is possible to perform 3D-mapping within a very short time interval and with very high resolution. We present the first detailed experimental 3D Fermi surface as well as other experimental results featuring advantages of our technique. In combination with various light sources our methodology and instrumentation offer new opportunities for high-resolution ARPES in the physical and life sciences

Первичная цилиарная дискинезия у ребенка с синдромом Симпсона-Голаби-Бемеля II типа вследствие мутации гена OFD1

Primary ciliary dyskinesia (PCD) is an orphan disease associated with mutations in several genes. It is a ciliopathy, an abnormality of the cilia and flagella. Ciliopathies include the extremely rare Simpson - Golabi - Bemel syndrome (SSGB) type II.The aim of this article is to familiarize the reader with the possibility of simultaneous presence of type II SSGB and PCD in a patient with bronchiectasis (BE).Results. The first clinical observation in the Russian literature is presented withhistory, physical examination, including clinical and morphologic examination, results of additional investigations and initiation of therapy. The case describes a 15-year-old patient with BE and other lesions typical of PCD confirmed on the basis of structural changes in the cilia of the respiratory epithelium of the trachea detected by transmission electron microscopy. The patient had a pathogenic mutation of the OFD1 gene responsible for the development of both type II SSGB and PCD.Conclusion. Several variants of ciliopathies may occur in one patient, and PCD may present as a syndrome.Первичная цилиарная дискинезия (ПЦД) является орфанным заболеванием, связанным с мутациями в различных генах, одной из разновидностей патологии ресничек и жгутиков — цилиопатий. К последним также относится крайне редко встречающийся синдром Симпсона—Голаби—Бемеля (ССГБ) II типа.Целью работы явилось ознакомление специалистов с возможностью одновременного присутствия у пациента с бронхоэктазами (БЭ) ССГБ II типа и ПЦД по данным клинического наблюдения.Результаты. Представлено первое в отечественной литературе клиническое наблюдение (данные анамнеза, объективного осмотра, включая клинико-морфологический осмотр, результаты дополнительных методов обследования и инициации терапии) 15-летнего пациента с БЭ и другими поражениями, типичными для ПЦД, подтвержденной на основании структурных изменений в ресничках респираторного эпителия трахеи, выявленных с помощью трансмиссионной электронной микроскопии, и патогенной мутации гена OFD1, ответственного за развитие как ССГБ II типа, так и ПЦД.Заключение. Установлено, что у одного пациента могут встречаться разные варианты цилиопатий, а ПЦД, таким образом, может иметь синдромальный характер

Ведение детей с бронхолегочной дисплазией

Bronchopulmonary dysplasia is one of the most significant early childhood chronic respiratory diseases. The article features modern approaches to preventing, diagnosing and treating broncho-pulmonary dysplasia, as well as ways of preventing complications and undesirable disease outcomes in patients older than 3 years. Members of professional associations — Union of Pediatricians of Russia and Russian Association of Perinatal Medicine Specialists — have summarized the experience of managing this category of patients at leading Russian pediatric centers according to the principles of evidence-based medicine and have provided scientific and practical data corresponding to the world level of knowledge with regard to the present problem.Бронхолегочная дисплазия — одно из наиболее значимых хронических респираторных заболеваний раннего детского возраста. В статье представлены современные подходы к профилактике, диагностике и лечению бронхолегочной дисплазии, а также пути предотвращения осложнений и неблагоприятных исходов заболевания у пациентов в возрасте старше 3 лет. Членами профессиональных ассоциаций — Союза педиатров России и Российской ассоциации специалистов перинатальной медицины — в соответствии с принципами доказательной медицины обобщены опыт ведения данной категории больных ведущими педиатрическими центрами Российской Федерации, изложены современные научно-практические данные, соответствующие мировому уровню знаний по настоящей проблеме

Состояние больных саркоидозом исходно и 10 лет спустя при различной тактике их ведения (мультицентровый анализ)

Summary. A multicenter (12 centers) retrospective analysis of health status of 83 sarcoidosis patients in time of diagnosis and after 10 years of treatment has been performed. In 10 years after diagnosis, 47 % of the patients had complete remission of pulmonary manifestations; mean forced spirometric values have not reduced in 10 years (excluding patients initially treated with anti-TB drugs). Patients treated with systemic steroids initially or during 10 yrs were less likely to have the complete remission (36.5 %) and more likely to have recurrent sarcoidosis course (57.1 %) compared to those not treated with systemic steroids. Pentoxifylline administration positively influenced the remission rate (71.4 %) and relapse rate in patients who had not received immunosuppressive therapy (28.6 %). A tendency has been found to positive effects of essential phospholipids on relapse rate and remission rate in sarcoidosis. Anti-TB therapy or treatment of sarcoidosis patients in TB centers negatively influenced the outcome of sarcoidosis. The results disclose an urgent need to imply new approaches to treatment of sarcoidosis, eg. anti-TNF-α drugs

Инфекции нижних дыхательных путей респираторно-синцитиальной вирусной этиологии у недоношенных детей и детей с бронхолегочной дисплазией

The article is devoted to the study of features of lower respiratory tract infection associated with respiratory syncytial virus. 40 cases of RSV-bronchiolitis in preterm children under year with/without bronchopulmonary dysplasia were analyzed. It was established that disease in those groups of patients had severe course because of the respiratory failure, which dominates in clinical pictures as symptoms of bronchial obstruction and apnea. Treatment of severe RSV-infection often demand admission to intensive care unit, supplemental oxygen and/or mechanical ventilation.Статья посвящена изучению особенностей поражения нижних дыхательных путей при респираторно-синцитиальной вирусной (РСВ) инфекции. Проанализировано 40 случаев РСВ-бронхиолита у недоношенных детей первого года жизни с бронхолегочной дисплазией и без нее. Установлено, что заболевание у данного контингента пациентов имеет тяжелое течение за счет развития дыхательной недостаточности, которая является основным клиническим проявлением, наряду с симптомами бронхиальной обструкции и апноэ. Лечение тяжелой РСВ-инфекции зачастую проводится в условиях отделения реанимации и интенсивной терапии, необходимо проведение оксигенотерапии и искусственной вентиляции легких