2,969 research outputs found
Measurement of ATP in soil: correcting for incomplete recovery
No full textMartens [Soil Biol. Biochem. 33 (2001) 701] recently reported that Jenkinson and Oades [Soil Biol. Biochem. II (1979) 193] method for measuring adenosine 5′ triphosphate (ATP) in soil leads to serious underestimations. We have now compared the Jenkinson and Oades extraction technique, which corrects for incomplete extraction of ATP by reference to a 'spike' of added ATP, with a sequential extraction procedure as used by Martens. Measurements of the ATP contents of four soils by the two procedures showed no significant differences, in contrast to Martens' finding
David Stewart Jenkinson. 25 February 1928 — 16 February 2011
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David Jenkinson was one of the most influential soil scientists of his generation, bringing new insights into the transformations of organic matter and nitrogen in soil. He spent the majority of his career at Rothamsted Research, Harpenden, UK. His studies were influential regarding the role of soil carbon stocks in the context of climate change and the role of nitrogen fertilizer in delivering adequate supplies of food for a growing world population. His research encompassed both fundamental studies on soil processes and immensely practical applications of this knowledge, often utilizing the Rothamsted long-term experiments that have run for over 170 years. He is particularly well known for his development of a method for determining the quantity of organic carbon held in the cells of living micro-organisms in soil, termed the ‘soil microbial biomass’. This breakthrough opened the way for a new wave of soil biological research. David developed one of the earliest computer models for the turnover of organic carbon in soil, known as the Rothamsted Carbon Model, RothC. This model, conceptually very simple, has proved highly successful in simulating and predicting changes in soil organic carbon (SOC) content under different management practices worldwide, being used by over 2600 people in 115 countries. His research using the stable isotope of nitrogen,
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N, in large-scale field experiments drew attention to the factors leading to inefficiencies in the use of nitrogen fertilizer but also demonstrated that it is possible to achieve high efficiency if good agricultural management practices are followed. It also demonstrated, more clearly than previously, the great importance of soil organic matter as a source of nitrogen for crops and the role of the soil microbial biomass both in immobilizing a proportion of applied fertilizer nitrogen and also in causing confusion in the interpretation of such experiments. By calculating nitrogen budgets for the Rothamsted long-term experiments he quantified the deposition of nitrogen compounds from atmosphere to land, laying foundations for later studies concerning the ecological and agricultural impacts of this significant input of nitrogen.
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Competition in regulated industries
No full textEleven papers analyze and draw some preliminary lessons from the British experience in introducing competition into regulated industries. Part 1 provides an overview, discussing regulation, competition, and the structure of prices and network industries. Part 2 focuses on the electricity industry in England and Wales and U.K. experiences with the introduction of competition in the gas industry, telecommunications, the water industry, and the rail industry. Part 3 provides the regulators' perspective on the generation and supply of electricity, the regulation of telecommunications, competition in the water and sewerage industry, and competition in the rail industry. Contributors are mainly economists and some are regulators. Helm is at New College, Oxford. Jenkinson is at the University of Oxford and at Keble College. Bibliography; index
Competition in regulated industries
No full textEleven papers analyze and draw some preliminary lessons from the British experience in introducing competition into regulated industries. Part 1 provides an overview, discussing regulation, competition, and the structure of prices and network industries. Part 2 focuses on the electricity industry in England and Wales and U.K. experiences with the introduction of competition in the gas industry, telecommunications, the water industry, and the rail industry. Part 3 provides the regulators' perspective on the generation and supply of electricity, the regulation of telecommunications, competition in the water and sewerage industry, and competition in the rail industry. Contributors are mainly economists and some are regulators. Helm is at New College, Oxford. Jenkinson is at the University of Oxford and at Keble College. Bibliography; index
The Public Philosophy Experiment
No full textThis episode of Why? is a special one–our 50th–and to celebrate we’re changing things around. Our most frequent guest Clay Jenkinson interviews host Jack Russell Weinstein. That’s right, after almost four years of asking other people about their research, it’s his turn on the hot seat. So tune in for a s spirited and spontaneous discussion.
Clay Jenkinson is the Director of The Dakota Institute through The Lewis & Clark Fort Mandan Foundation, Chief Consultant to The Theodore Roosevelt Center through Dickinson State University, Distinguished Humanities Scholar at Bismarck State College, and a columnist for the Bismarck Tribune. A cultural commentator who has devoted most of his professional career to public humanities programs, Clay is the host of public radio’s The Thomas Jefferson Hour. He has been honored by two United States presidents for his work. On November 6, 1989, he received one of the first five Charles Frankel Prizes, the National Endowment for the Humanities’ highest award (now called the National Humanities Medal), at the nomination of the NEH Chair, Lynne Cheney. Since his first work with the North Dakota Humanities Council in the late 1970s, including a pioneering first-person interpretation of Meriwether Lewis, Clay Jenkinson has made thousands of presentations throughout the United States and its territories, including Guam and the Northern Marianas. He is also the author of numerous bookshttps://commons.und.edu/why-radio-archive/1087/thumbnail.jp
THE TRAVEL DAIRY OF THE AMBASSADOR, TOURIST AND MERCHANT ANTONIO JENKINSON REFLECTS THE INFORMATION ABOUT STATE MANAGEMENT IN THE COUNTRIES OF CENTRAL ASIA
No full textIn this article, based on the work of Antonio Jenkinson, the author sheds on light on the issues of state management in Central Asia in the 16th century
Thomas Jenkinson Woodward, Bungay, [Suffolk], to James Edward Smith, 12 Great Marlborough Street, London
No full textDetails of his journey and pending visit to London. Expects [Charles] Bryant [(d 1799)] to be "very angry" on reading his paper [on 'Lycoperdons'], expects an attack in the "Gentleman's Magazine". Saw the attack on Smith's 'Geranium lucidum' of "English botany" in "Gentleman's Magazine"; unsure who the author is and attempts to apologise for him. Approves of "English botany" including cryptogams but warns against figuring too many for fear of "disgusting the florists & the ladies". Hopes to send [James] Sowerby 'Cineraria palustris' and others from Yarmouth; doubts whether the drawing of 'Agaric' is the 'Clypeolarias' of Bulliard, as [William] Withering refers to it. Visits from Sir John Rous [1st Earl of Stradbroke (1750-1827), politician] who grows exotic trees in his plantations, does not study them scientifically but knows their names in "Hortus Kewensis"
Thomas Jenkinson Woodward, Bungay, [Suffolk], to James Edward Smith, 12 Great Marlborough Street, London
No full textDetails of his journey and pending visit to London. Expects [Charles] Bryant [(d 1799)] to be "very angry" on reading his paper [on 'Lycoperdons'], expects an attack in the "Gentleman's Magazine". Saw the attack on Smith's 'Geranium lucidum' of "English botany" in "Gentleman's Magazine"; unsure who the author is and attempts to apologise for him. Approves of "English botany" including cryptogams but warns against figuring too many for fear of "disgusting the florists & the ladies". Hopes to send [James] Sowerby 'Cineraria palustris' and others from Yarmouth; doubts whether the drawing of 'Agaric' is the 'Clypeolarias' of Bulliard, as [William] Withering refers to it. Visits from Sir John Rous [1st Earl of Stradbroke (1750-1827), politician] who grows exotic trees in his plantations, does not study them scientifically but knows their names in "Hortus Kewensis"
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