27 research outputs found
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14C Chronology of Late Pleistocene-Holocene Events in the Nizhnee Priamurie (Southeast Russia)
The Russian Far East is characterized by widespread peat bogs with a sufficiently thick peat accumulation. A series of radiocarbon dates from the studied peat bogs (in Lower Amur) were obtained. Analysis of these dates shows that the total peat formation in this territory began in the Late Pleistocene-Holocene (11,830 +/820, TIG-157; 9975 +/120, SOAN-4025). The rates of peat accumulation and the humidity index were counted. In addition, the botanical composition and degree of peat decomposition were defined. These data allow to study in more detail climate fluctuation and the 14C chronology of Holocene events in the region studied.The Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform February 202
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14C Ages of Tephra Layers from the Holocene Deposits of Kunashir Island (Russian Far East)
From the 16th International Radiocarbon Conference held in Gronigen, Netherlands, June 16-20, 1997.Holocene deposits from the central and southern regions of the Kunashir Island contain tephra from 12 volcanic eruptions (Kn1-12). We studied radiocarbon data, mineralogical composition, and distribution of the tephra layers in different Holocene facies. The main sources of the Holocene tephra samples were the volcanoes of Hokkaido Island. The distribution of ash layers on Kunashir Island allows us to estimate their direction. Ash layers can be reliable markers for age determination of different coastal landforms on open oceanic shores. We propose here a tephrastratigraphical scheme for different Middle-Late Holocene facies.This material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries.The Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform February 202
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14C Dating of Late Pleistocene-Holocene Events on Kunashir Island, Kuril Islands
From the 16th International Radiocarbon Conference held in Gronigen, Netherlands, June 16-20, 1997.Kunashir Island is a very important site for paleoenvironmental reconstructions. Until recently, very little information on Quaternary deposits was available. We studied the environmental evolution of this oceanic island under the influence of geomorphological processes, volcanism and strong marine currents. This paper presents new data that allow a detailed reconstruction of the environmental development of Kunashir Island during the Late Pleistocene-Holocene, based on ca. 80 radiocarbon dates and diatom, pollen and sedimentological data. The vegetation development reflects climate changes and warm/cold current migrations.This material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries.The Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform February 202
The influence of thermomechanical working conditions on the resistance of low-carbon steel to sulfide cracking
General and local changes in the electroencecphalogram during the formation of conditioned motor reflexes in man
PRINCIPLES AND METHODS OF WHEAT BREEDING ON TOLERANCE TO DISEASES IN KRIA NAMED AFTER P.P. LUKIYANENKO
The article deals with the principles, methods and study results of the development of winter wheat varieties, tolerant to the widely spread and harmful diseases. The article gives the characteristics of phytosanitary risks dangerous for the gross yields of wheat. The main trends of the breeding-immunological researches in the institute, materials and methods which are used in wheat breeding for their immunity have been presented here. The results of the complex immunological assessment of winter wheat varieties tolerant to leaf rust are discussed in the article. The molecular screening showed that the winter wheat varieties, developed in the institute, possessed different types of tolerance genetically determined by the nature. It was established that the commercial varieties possessed poorly effective genes of tolerance Lr1, Lr10, Lr26, Lr34 and their various combinations or ‘pyramids’. The article presents the classification of the varieties according to the degree of their infection with leaf rust that is of great importance for the breeding and the conducting of genetic monitoring of disease resistance, to optimize phytosanitary state in the wheat agro phytocenosis. It has been determined that the most efficient method to create the varieties tolerant to head fusarium is a complex hybridization, intended on the pyramiding of the genes with specific and unspecific resistance. The important thing of the breeding work is to carry out multiple selections in the hybrid populations, starting with F2 under artificial infection. Using such methods the new variety ‘Urup’ has been obtained and approved for use in the production