AFLP-analysis of genetic diversity in soybean [Glycine max (l.) Merr.] cultivars Russian and foreign selection

ArticleGenetic diversity of 11 cultivars of soybean (Glycine max) from a VIR (N.I. Vavilov Institute of Plant Genetic Resources) collection was analyzed by the AFLP (amplified fragment length polymorphism) technique. From 18 tested primer combinations, both of them were selected for further analysis. From these two primer combinations (E32/M60 and E32/M59), 90 DNA fragments were obtained, 39 (43%) of them were polymorphic. Unique DNA fragments were found in accessions SibNIISHoz 6, Soer-4, Determinant. The Jaccard's similarity indices varied from 0.79 (between Sonata and Ugra) to 0.94 (between Ugra and Garmoniya) with an average of 0.775. Cluster analysis placed the cultivars into the several groups but separation in groups was not related to their origin or biological characteristics, even though cultivars Nordik and Soer-4 (cultivars recommended for Central Black Earth region of Russia) clustered together on the dendrogram. The obtained high values of Jaccard genetic similarity index and low level of polymorphism and differentiation illustrated a relatively low genetic diversity in our studied cultivars, which correlated with different other studies on soybean genetic diversity with AFLP-analysis

Оптимизация параметров шумоподавления фильтров высокопроизводительных источников питания

For a noise-reduction filter, the parameters of the manufactured device often do not fit the expected parameters during development, what is caused by the spread of the parameters of the electronic components or their parasitic parameters, as well as due to the presence of its own capacitance and inductance of the frequency response assembly. In this article, the influence of parasitic parameters of components and fasteners on the filter frequency response is considered. Utilizing the electronic simulator software, the filter parameters were modeled in the frequency range from 10 kHz to 1 GHz. Based on the simulation results, recommendations were given for optimizing the filter mounting elements and changing the inductance of low-frequency chokes.Параметры готового электронного изделия могут не соответствовать расчетным, что обусловлено, например, неучтенными паразитными связями. По этой причине при конструировании помехоподавляющих фильтров эффективность фильтрации может быть занижена по сравнению с ожидаемой. Проведено моделирование изменения амплитудно-частотной характеристики фильтра, обусловленное влиянием паразитных параметров компонентов и элементов механического крепежа, в диапазоне частот от 10 кГц до 1 ГГц. Предложены рекомендации по модификации элементов механического крепления и оптимизации параметров дросселей низкой частоты

Impaired complex I repair causes recessive Leber's hereditary optic neuropathy

Leber's hereditary optic neuropathy (LHON) is the most frequent mitochondrial disease and was the first to be genetically defined by a point mutation in mitochondrial DNA (mtDNA). A molecular diagnosis is achieved in up to 95% of cases, the vast majority of which are accounted for by 3 mutations within mitochondrial complex I subunit-encoding genes in the mtDNA (mtLHON). Here, we resolve the enigma of LHON in the absence of pathogenic mtDNA mutations. We describe biallelic mutations in a nuclear encoded gene, DNAJC30, in 33 unsolved patients from 29 families and establish an autosomal recessive mode of inheritance for LHON (arLHON), which to date has been a prime example of a maternally inherited disorder. Remarkably, all hallmarks of mtLHON were recapitulated, including incomplete penetrance, male predominance, and significant idebenone responsivity. Moreover, by tracking protein turnover in patient-derived cell lines and a DNAJC30-knockout cellular model, we measured reduced turnover of specific complex I N-module subunits and a resultant impairment of complex I function. These results demonstrate that DNAJC30 is a chaperone protein needed for the efficient exchange of complex I subunits exposed to reactive oxygen species and integral to a mitochondrial complex I repair mechanism, thereby providing the first example to our knowledge of a disease resulting from impaired exchange of assembled respiratory chain subunits

Selection combinations of primers for determining intervarietal and intravarietal polymorphism Glycine hispida

The article describes the experience of selecting combinations of primers for AFLP-analysis intravarietal and intervarietal polymorphism soybean accessions. During the experiment, has been tested 18 primer combinations. As a result, were selected 5 primer combinations, the most informative labeling for the soybean genome. Total detect 132 AFLP-fragments, of which 60 were polymorphic and characterized by individual genotypes varieties

AFLP-analysis of genetic diversity in soybean [Glycine max (L.) Merr.] cultivars Russian and foreign selection

Genetic diversity of 11 cultivars of soybean (Glycine max) from a VIR (N.I. Vavilov Institute of Plant Genetic Resources) collection was analyzed by the AFLP (amplified fragment length polymorphism) technique. From 18 tested primer combinations, both of them were selected for further analysis. From these two primer combinations (E32/M60 and E32/M59), 90 DNA fragments were obtained, 39 (43%) of them were polymorphic. Unique DNA fragments were found in accessions SibNIISHoz 6, Soer-4, Determinant. The Jaccard's similarity indices varied from 0.79 (between Sonata and Ugra) to 0.94 (between Ugra and Garmoniya) with an average of 0.775. Cluster analysis placed the cultivars into the several groups but separation in groups was not related to their origin or biological characteristics, even though cultivars Nordik and Soer-4 (cultivars recommended for Central Black Earth region of Russia) clustered together on the dendrogram. The obtained high values of Jaccard genetic similarity index and low level of polymorphism and differentiation illustrated a relatively low genetic diversity in our studied cultivars, which correlated with different other studies on soybean genetic diversity with AFLP-analysis. © 2017, Eesti Pollumajandusulikool. All rights reserved

AFLP-analysis of genetic diversity in soybean [Glycine max (L.) Merr.] cultivars Russian and foreign selection

Genetic diversity of 11 cultivars of soybean (Glycine max) from a VIR (N.I. Vavilov Institute of Plant Genetic Resources) collection was analyzed by the AFLP (amplified fragment length polymorphism) technique. From 18 tested primer combinations, both of them were selected for further analysis. From these two primer combinations (E32/M60 and E32/M59), 90 DNA fragments were obtained, 39 (43%) of them were polymorphic. Unique DNA fragments were found in accessions SibNIISHoz 6, Soer-4, Determinant. The Jaccard's similarity indices varied from 0.79 (between Sonata and Ugra) to 0.94 (between Ugra and Garmoniya) with an average of 0.775. Cluster analysis placed the cultivars into the several groups but separation in groups was not related to their origin or biological characteristics, even though cultivars Nordik and Soer-4 (cultivars recommended for Central Black Earth region of Russia) clustered together on the dendrogram. The obtained high values of Jaccard genetic similarity index and low level of polymorphism and differentiation illustrated a relatively low genetic diversity in our studied cultivars, which correlated with different other studies on soybean genetic diversity with AFLP-analysis. © 2017, Eesti Pollumajandusulikool. All rights reserved

FLOW-CYTOFLUORIMETRIC ANALYSIS OF CYTOTOXICITY OF YERSINIA PESTIS STRAINS

Aim. Study cytotoxic effect of Yersinia pestis strains with various degree of virulence on leukocytes of whole defibrinated human blood. Materials and methods. 15 strains of Y. pestis were used in the study. DNA histograms were registered using flow cytofluorimeter. Results. Possibility of using cytotoxicity to differentiate Y. pestis into virulent and avirulent wfas experimentally proven. The data obtained was comparable with LD5o for mice and did not contradict molecular-genetic characteristics of the strains. Conclusion. The approach proposed allows to obtain reliable results and is perspective for evaluation of virulence for Y. pestis strains

DETERMINATION OF VIRULENCE PROPERTIES OF PATHOGENIC MICROORGANISMS IN VITRO: STATE-OF-ART

Various methods for evaluation of virulence properties of causative agents of infectious diseases in vitro were analyzed: molecular-genetic, cultural-biochemical, immunologic, physiologic. Predominant use of molecular-genetic methods, expediency of a complex approach, relevance of search of novel informative parameters of virulence are noted. Study of biological properties of pathogens in vitro is the first screening stage of evaluation of their virulence