Image Reconstruction in Multi-Channel Model Under Gaussian Noise

The image reconstruction from noisy data is studied. A nonparametric boundary function is estimated from observations in N independent channels in Gaussian white noise. In each channel the image and the background intensities are unknown. They define a non-identifiable nuisance parameter that slows down the typical minimax rate of convergence. The large sample asymptotics of the minimax risk is found and an asymptotically optimal estimator for boundary function is suggested

Structural aspects of translation termination on the ribosome

Translation of genetic information encoded in messenger RNAs into polypeptide sequences is carried out by ribosomes in all organisms. When a full protein is synthesized, a stop codon positioned in the ribosomal A site signals termination of translation and protein release. Translation termination depends on class I release factors. Recently, atomic-resolution crystal structures were determined for bacterial 70S ribosome termination complexes bound with release factors RF1 or RF2. In combination with recent biochemical studies, the structures resolve long-standing questions about translation termination. They bring insights into the mechanisms of recognition of all three stop codons, peptidyl-tRNA hydrolysis, and coordination of stop-codon recognition with peptidyl-tRNA hydrolysis. In this review, the structural aspects of these mechanisms are discussed

Analysis and Design of Simulation Experiments with Linear Approximation Models

There is a necessity in a number of IIASA's researches to deal with analyzing the properties of the computerized versions of complex models. The use of simulation experiments is one of the most successful tools in solving this problem. In this paper, the package of programs for the design and analysis of simulation experiments is described. The package was prepared in the All-Union Institute of Systems Studies in Moscow. It is one of the first attempts in this field, and the authors did not expect to have constructed a very comprehensive variant, but hope that more experience, remarks and critiques will help to improve and extend the package in a most useful and practical way

O impacto da abordagem competitiva na motivação dos alunos no esporte

This study is devoted to the description of the competitive method as an effective way to increase the motivation of today's students in physical education classes in higher education. The purpose of the study is to assess the impact of the competitive method on the level of students' motivation in sports, positive interest for studying the subject. Allocation of types of motivation allowed the author to evaluate and trace the dynamics of changes in the level of motivation to the sport. The level of motivation was determined using the author's methodology, developed on the basis of scientific literature. The basis of the study is the Branch of IUT in the city of Surgut, the department of Natural Science and Humanities, during physical education classes. The researcher has shown that the use of a competitive method in physical education classes can increase motivation, activates the interest of students.Este estudio está dedicado a la descripción del método competitivo como una forma efectiva de aumentar la motivación de los estudiantes de hoy en las clases de educación física en la educación superior. El propósito del estudio es evaluar el impacto del método competitivo en el nivel de motivación de los estudiantes en los deportes, interés positivo para estudiar la materia. La asignación de los tipos de motivación permitió al autor evaluar y rastrear la dinámica de los cambios en el nivel de motivación del deporte. El nivel de motivación se determinó utilizando la metodología del autor, desarrollada sobre la base de la literatura científica. La base del estudio es la Rama de IUT en la ciudad de Surgut, el departamento de Ciencias Naturales y Humanidades, durante las clases de educación física. El investigador ha demostrado que el uso de un método competitivo en las clases de educación física puede aumentar la motivación, activa el interés de los estudiantes.Este estudo é dedicado à descrição do método competitivo como uma forma eficaz de aumentar a motivação dos alunos de hoje em aulas de educação física no ensino superior. O objetivo do estudo é avaliar o impacto do método competitivo sobre o nível de motivação dos alunos em esportes, interesse positivo para estudar o assunto. A alocação de tipos de motivação permitiu ao autor avaliar e traçar a dinâmica de mudanças no nível de motivação para o esporte. O nível de motivação foi determinado usando a metodologia do autor, desenvolvida com base na literatura científica. A base do estudo é a Filial da IUT na cidade de Surgut, departamento de Ciências Naturais e Humanidades, durante as aulas de educação física. O pesquisador mostrou que o uso de um método competitivo nas aulas de educação física pode aumentar a motivação, ativa o interesse dos alunos

Mechanism of premature translation termination on a sense codon

Accurate translation termination by release factors (RFs) is critical for the integrity of cellular proteomes. Premature termination on sense codons, for example, results in truncated proteins, whose accumulation could be detrimental to the cell. Nevertheless, some sense codons are prone to triggering premature termination, but the structural basis for this is unclear. To investigate premature termination, we determined a cryo-EM structure of the Escherichia coli 70S ribosome bound with RF1 in response to a UAU (Tyr) sense codon. The structure reveals that RF1 recognizes a UAU codon similarly to a UAG stop codon, suggesting that sense codons induce premature termination because they structurally mimic a stop codon. Hydrophobic interaction between the nucleobase of U3 (the third position of the UAU codon) and conserved Ile 196 in RF1 is important for misreading the UAU codon. Analyses of RNA binding in ribonucleoprotein complexes or by amino acids reveal that Ile-U packing is a frequent protein-RNA binding motif with key functional implications. We discuss parallels with eukaryotic translation termination by the release factor eRF1

Termi-Luc: a versatile assay to monitor full-protein release from ribosomes

Termination of protein biosynthesis is an essential step of gene expression, during which a complete functional protein is released from the ribosome. Premature or inefficient termination results in truncated, non-functional or toxic proteins that may cause disease. Indeed, more than 10% of human genetic diseases are caused by nonsense mutations leading to premature termination. Efficient and sensitive approaches are required to study eukaryotic termination mechanisms and to identify potential therapeutics that modulate termination. Canonical radioactivity-based termination assays are complex, report on a short peptide release, and are incompatible with high-throughput screening. Here we describe a robust and simple in vitro assay to study the kinetics of full-protein release. The assay monitors luminescence upon release of nanoluciferase from a mammalian pre-termination complex. The assay can be used to record time-progress curves of protein release in a high-throughput format, making it optimal for studying release kinetics and for high-throughput screening for small molecules that modulate the efficiency of termination

Модификация физико-химических свойств биосовместимых полимеров методом ионной имплантации

В данной работе было рассмотрено влияние ионной имплантации ионов серебра, цинка и магния с экспозиционными дозами 110‘^ и ион/см^ на поверхностные свойства поливиниловог