48,134 research outputs found
Molybdenum in soils and plants and its potential importance to livestock nutrition, with special reference to sub-Saharan Africa
Summarises the role of molybdenum in soils and plants and its potential importance in livestock nutrition in sub-Saharan Africa. Discusses the functions of molybdenum in plants and animals, diagnosis including deficiency symptoms, soil testing & leaf analysis, molybdenum content of soils, factors affecting availability of molybdenum to plants, molybdenum responses, and molybdenum-copper-sulphur inter-relationships in livestock
Anomalous supply of bioessential molybdenum in mid-Proterozoic surface environments
We are grateful to A. Sandison and W. Thayalon for skilled technical support, and Mike Porter and an anonymous reviewer, who helped to clarify the manuscript.Peer reviewedPostprin
Growth of phase-pure, crack-free single crystals and large-grained polycrystals of molybdenum disilicide
High purity molybdenum disilicide crystals are prepared by zone melting sintered compacts. This method yields single crystals or polycrystals free from macrocracks which allow better measurement and evaluation of mechanical properties
Allelic heterogeneity and trade-off shape natural variation for response to soil micronutrient
Peer reviewedPublisher PD
Explorable and economically attractive mineral deposits in the Siberian and Far Eastern Federal Districts of Russia
Purpose. Selection of the most explorable mineral deposits in the Siberian and Far Eastern Federal Districts of the Russian Federation as investment projects.
Methods. System rank analysis of minimizing the risks of investment projects for their provision with transport and energy infrastructure.
Findings. There were selected the most attractive mineral deposits in the Siberian and Far Eastern Federal Districts, which had not been developed before due to lack of investment.
Originality. Ranking of mineral deposits is carried out not by geological and economic indicators, but according the degree of these objects availability.
Practical implications. It is presented an additional possibility of the Siberian and Far Eastern Federal Districts territories development by changing the attractiveness of investment programs for the mineral resources exploitation.Мета. Оцінка найбільш доступних і привабливих для розробки родовищ корисних копалин у Сибірському та Далекосхідному федеральних округах Російської Федерації в якості інвестиційних проектів.
Методика. Для оцінки доступності родовищ корисних копалин виконано комплексний аналіз їх запасів і цінності по відношенню до внутрішнього й зовнішнього ринків, а також наявності транспортної інфраструктури (автомобільних і залізних доріг, судноплавних річок, морських портів), що дозволяє здійснювати достатнє вивезення великих обсягів видобутих мінеральних ресурсів.
Результати. Обрані 30 найбільш привабливих в інвестиційному відношенні родовищ корисних копалин у Сибірському та Далекосхідному федеральних округах, які раніше не освоювались через нестачу інвестицій та мають пріоритет щодо імпортозаміщення (марганцеві руди, ільменіт, рутиловий і цирконовий концентрати, плавиковий шпат і графіт), високоліквідності (золото) та експортноорієнтованості (коксівне й енергетичне вугілля, мідь, молібден, цинк, свинець, калійні солі, фосфатна сировина).
Наукова новизна. Запропоновано здійснювати ранжування родовищ корисних копалин не тільки з урахуванням геолого-економічних показників, а також з урахуванням їх доступності (наявність транспортної та енергетичної інфраструктур).
Практична значимість. Складено схематичну карту розташування доступних для освоєння родовищ затребуваних корисних копалин на території Сибірського та Далекосхідного федеральних округів, що дає додаткову можливість більш ефективного розвитку даних територій.Цель. Оценка наиболее доступных и привлекательных для разработки месторождений полезных ископаемых в Сибирском и Дальневосточном федеральных округах Российской Федерации в качестве инвестиционных проектов.
Методика. Для оценки доступности месторождений полезных ископаемых выполнен комплексный анализ их запасов и ценности по отношению к внутреннему и внешнему рынкам, а также наличия транспортной
инфраструктуры (автомобильных и железных дорог, судоходных рек, морских портов), позволяющих осуществлять достаточный вывоз крупных объемов добытых минеральных ресурсов.
Результаты. Выбраны 30 наиболее привлекательных в инвестиционном отношении месторождений полезных ископаемых в Сибирском и Дальневосточном федеральных округах, ранее не осваиваемых по факту недостатка инвестиций, имеющих приоритет по импортозамещению (марганцевые руды, ильменитовый, рутиловый и цирконовый концентраты, плавиковый шпат и графит), высоколиквидности (золото) и экспортноориентированности (коксующийся и энергетический угли, медь, молибден, цинк, свинец, калийные соли, фосфатное сырье).
Научная новизна. Предложено осуществлять ранжирование месторождений полезных ископаемых не только с учетом геолого-экономических показателей, а также с учетом их доступности (наличие транспортной и энергетической инфраструктур).
Практическая значимость. Составлена схематическая карта месторасположения доступных для освоения месторождений востребованных полезных ископаемых на территории Сибирского и Дальневосточного федеральных округов, что дает дополнительную возможность более эффективного развития этих территорий.The studies have been carried out according to the materials of the report with the participation of the
authors in 11th International Forum of the Association of Administrations of North East Asia Regional Governments (Chzhandzyadze, Hunan Province, China, September 26, 2017)
Managing Alaska Soils
This publication is for the gardener who wants to gain a more thorough understanding of soil basics, including soil components, texture, structure, water permeability and chemistry. There is also information on soil fertility and plant nutrients.This publication replaces the following Extension publications: Soil Fundamentals by C.L. Johnson, former Extension Assistant, Palmer Research Station, University of Alaska Fairbanks and Soil Fertility Basics and Soil Sampling and Analysis by J.L. Walworth, former Soil Scientist, Agricultural and Forestry Experiment Station, Palmer Research Center, University of Alaska Fairbanks
Detection and Treatment of Mineral Nutrition Problems in Grazing Sheep
Livestock Production/Industries,
Accumulation of metals, cobalt (Co), molybdenum (Mo) and nickel (Ni), to soil invertebrates in a boreal forest in Nilsiä, Eastern Finland
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Adaptations of Escherichia coli strains to oxidative stress are reflected in properties of their structural proteomes.
BACKGROUND:The reconstruction of metabolic networks and the three-dimensional coverage of protein structures have reached the genome-scale in the widely studied Escherichia coli K-12 MG1655 strain. The combination of the two leads to the formation of a structural systems biology framework, which we have used to analyze differences between the reactive oxygen species (ROS) sensitivity of the proteomes of sequenced strains of E. coli. As proteins are one of the main targets of oxidative damage, understanding how the genetic changes of different strains of a species relates to its oxidative environment can reveal hypotheses as to why these variations arise and suggest directions of future experimental work. RESULTS:Creating a reference structural proteome for E. coli allows us to comprehensively map genetic changes in 1764 different strains to their locations on 4118 3D protein structures. We use metabolic modeling to predict basal ROS production levels (ROStype) for 695 of these strains, finding that strains with both higher and lower basal levels tend to enrich their proteomes with antioxidative properties, and speculate as to why that is. We computationally assess a strain's sensitivity to an oxidative environment, based on known chemical mechanisms of oxidative damage to protein groups, defined by their localization and functionality. Two general groups - metalloproteins and periplasmic proteins - show enrichment of their antioxidative properties between the 695 strains with a predicted ROStype as well as 116 strains with an assigned pathotype. Specifically, proteins that a) utilize a molybdenum ion as a cofactor and b) are involved in the biogenesis of fimbriae show intriguing protective properties to resist oxidative damage. Overall, these findings indicate that a strain's sensitivity to oxidative damage can be elucidated from the structural proteome, though future experimental work is needed to validate our model assumptions and findings. CONCLUSION:We thus demonstrate that structural systems biology enables a proteome-wide, computational assessment of changes to atomic-level physicochemical properties and of oxidative damage mechanisms for multiple strains in a species. This integrative approach opens new avenues to study adaptation to a particular environment based on physiological properties predicted from sequence alone
Molybdenum sputtering film characterization for high gradient accelerating structures
Technological advancements are strongly required to fulfill the demands of
new accelerator devices with the highest accelerating gradients and operation
reliability for the future colliders. To this purpose an extensive R&D
regarding molybdenum coatings on copper is in progress. In this contribution we
describe chemical composition, deposition quality and resistivity properties of
different molybdenum coatings obtained via sputtering. The deposited films are
thick metallic disorder layers with different resistivity values above and
below the molibdenum dioxide reference value. Chemical and electrical
properties of these sputtered coatings have been characterized by Rutherford
backscattering, XANES and photoemission spectroscopy. We will also present a
three cells standing wave section coated by a molybdenum layer 500 nm
thick designed to improve the performance of X-Band accelerating systems.Comment: manuscript has been submitted and accepted by Chinese Physics C
(2012
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