David Tom Cooke

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The sap flow (Jv) and the osmotic hydraulic conductance (L0) of detached, exuding root systems from wheat (Triticum aestivum L. cv. Chinese Spring) plants deprived of nitrogen for 5 d (— N) or of phosphorus for 7 d (—P), were measured and compared with controls receiving a complete nutrient supply. In the roots of — N and — P plants, Jv and L0 decreased(More)
The hydraulic conductivity of excised roots (Lpr) of the legume Lotus japonicus (Regel) K. Larsen grown in mist (aeroponic) and sand cultures, was found to vary over a 5-fold range during a day/night cycle. This behaviour was seen when Lpr was measured in roots exuding, either under root pressure (osmotic driving force), or under an applied hydrostatic(More)
The responses of two sugar beet genotypes, 24367 (putative droughttolerant) and N6 (putative drought intolerant), to drought and nutrientdeficiency stress were investigated in an attempt to identify reliable andsensitive indicators of stress tolerance. In glasshouse-grown plants of bothgenotypes, relative water content (RWC) of the leaves decreased and(More)
The second section extends to genetic and developmental responses, whilst the final section moves on to include responses to specific environmental changes including: effects of light, increased UV-B and stresses caused by drought and changing gaseous composition of the atmosphere (e.g., increased ozone and CO2). Possibly one of the most damaging of these(More)
This book is the second in the series, Nutrients in Ecosystems. The editor, in his preface, is quick to point out how neglected, sulphur has been, as a topic of study by plant nutritionists. This is because, in the past, the presence of large amounts of atmospheric sulphur, soil-bound sulphur and sulphur as by-products from other mineral fertilisers, had(More)
BACKGROUND The effect of epicardial artery stenosis on myocardial microvascular resistance remains controversial. Recruitable collateral flow, which may affect resistance, was not incorporated into previous measurements. METHODS AND RESULTS In an open-chest pig model, distal coronary pressure was measured with a pressure wire, and the apparent minimal(More)
Transpiration, xylem water potential and water channel activity were studied in developing stolons and leaves of strawberry (Fragaria × ananassa Duch.) subjected to drought or flooding, together with morphological studies of their stomata and other surface structures. Stolons had 0.12 stomata mm−2 and a transpiration rate of 0.6 mmol H2O m−2 s−1, while the(More)
Prior to the synthesis of dyes from by-products of thepetrochemical industry all colour was derived from natural sources,including plants. As the awareness of the need to preserve ournatural resources increases and attitudes change towards achievingthis, interest is growing in finding renewable resources, which canbe used as alternatives. Recent work, to(More)
BACKGROUND We hypothesized that general thoracic surgeons (GTS) predominantly perform complex noncardiac thoracic surgery in academic hospitals compared with cardiac surgeons (CS), general surgeons, and surgical oncologists. METHODS Fiscal year 2007-2008 to 2009-2010 coding and work relative value unit data from the University Health System Consortium and(More)
BACKGROUND Primary adenosquamous carcinoma (ASC) of the lung is a rare tumor that may carry a poor prognosis. We examined a national database to see if ASC exhibited distinct clinical behavior from squamous cell (SC) and adenocarcinoma (AC) of the lung. METHODS This is a retrospective study querying the Surveillance, Epidemiology, and End Results database(More)