Reaction norm analysis of pig growth using environmental descriptors based on alternative traits     

Sarita Zhe Ying Guy  Li Li  Peter Campbell Thomson  Susanne Hermesch 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2019,136(3):153-167

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Use of Sequential Extraction in the Study of Heavy Metal Retention by Silty Soils     

Cabral  Alexandre R.  Lefebvre  Guy 《Water, air, and soil pollution》1998,102(3-4):329-344

This study focused on the capability of two silty soils (tills) having low clay contents and CEC to retain and release two heavy metals, Pb and Cu. Samples of two non contaminated till deposits from the Eastern Townships region of Quebec, Canada, were artificially contaminated with concentrated solutions of these heavy metals. The latter were later extracted from the various geochemical phases of the soils by using the sequential extraction procedure. The results show that silty soils may have a relatively high heavy metal retention capacity due to the presence of carbonate and that this retention capacity can be comparable in magnitude to the retention capacity of certain clayey soils. This is particularly positive in the context of municipal waste disposal (landfills) in Quebec, where some old sanitary landfill sites are underlain by till deposits. A high buffering capacity is not as desirable in the case a deposit needs to undergo remediation.  相似文献   

Corticosterone plasma concentration in male mule ducks: effects of sampling sites, repeated samplings and ACTH injections.     

J Noirault  D Guémené  G Guy  J M Faure 《British poultry science》1999,40(2):304-308

1. Changes in plasma corticosterone concentrations according to puncture sites and various challenges including injections of an ACTH agonist (Immediate Synacthen) were investigated in male mule ducks. 2. Lower concentrations were measured in samples drawn by puncture from the occipital sinus than at a wing vein site. 3. Immobilisation and a single intramuscular injection of saline solution (1 ml, 0.9%) had no effect on plasma corticosterone after 15 min. 4. A single intramuscular injection of ACTH (5 microg/kg body weight) produced a rise (P<0.05) in corticosterone. Maximum concentrations were measured after 10 min and, in the absence of further sampling, a return to initial levels was observed by 1 h. 5. On the other hand, repeated bleedings following ACTH challenge maintained higher corticosterone concentrations. 6. A single intramuscular injection of ACTH at doses ranging between 0.625 to 20 microg/kg body weight increased corticosterone concentrations (P<0.05) in a dose-dependent manner, with the responses plateauing at doses of 1.25 microg/kg and higher.  相似文献   

Domestication of plants for sustainable agriculture in drylands: Experience from the Negev Desert     

Oren Shelef  Ofer Guy  Elaine Solowey  Michael Kam  A. Allan Degen  Shimon Rachmilevitch 《Arid Land Research and Management》2016,30(2):209-228

With globalization in the last century, introduction of exotic plant species for commercial use has become more accessible. Such attempts may involve extreme land changes. We stress that domestication of native species should be preferred to the introduction of exotic species. We took the initial steps in domesticating several species by examining commercial uses and studying aspects of plant physiology. The following desert plants were considered: Bassia indica, for salt phytoremediation and for livestock feed; Commiphora gileadensis, as an agent against cancer cells; Artemisia sieberi and A. judaica, as plants with allopathic traits; Ficus palmate, as a stand for fig plantation; Balanites aegyptiaca, as a medicinal plant and for other uses; Portulaca oleracea and Scorzonera judaica, as food crops with added values; and Pistacia atlantica, as rootstock for P. vera.  相似文献   

Models with only two predictor variables can accurately predict seed yield in diploid and tetraploid red clover     

Tim Vleugels  Bob Ceuppens  Gerda Cnops  Peter Lootens  Frederik R. D. van Parijs  Guy Smagghe  Isabel Roldán-Ruiz 《Euphytica》2016,209(2):507-523

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Interactive effects of organic acids in the rhizosphere     

Eva Oburger  Guy J.D. Kirk  Markus Puschenreiter 《Soil biology & biochemistry》2009,41(3):449-679

Organic acids released into the rhizosphere may perform many beneficial functions to the plant including metal detoxification and enhancement of nutrient acquisition. Typically, these organic acids are studied in isolation; however, roots simultaneously exude a cocktail of organic acids and other substances, and their combined impact on rhizosphere processes may be quite different. It has been hypothesized that some exudates may play secondary roles (e.g. inhibitors of microbial activity, blockage of sorption sites), which might enhance the longevity and nutrient-mobilization capacity of others. Here we investigated how the decomposition, sorption and P-solubilizing effects of citrate, malate and oxalate are affected by the presence of malonate and shikimate. We found that in a range of agricultural soils the decomposition of citrate, malate and oxalate was rapid, but not influenced by the presence of large quantities of shikimate or malonate. This suggests that the individual organic acids are taken up by different transport mechanisms or components of the microbial community. At large concentrations, malonate decreased sorption of citrate, malate and oxalate on the soil, whilst shikimate had little effect. The capacity of citrate, malate and oxalate to desorb P was significantly greater in cocktails containing malonate compared with the single organic acid; no effect was seen with shikimate. We conclude that neither malonate nor shikimate at realistic concentrations will significantly affect the biodegradation of citrate, malate or oxalate in the rhizosphere, and while malonate did enhance P desorption, this effect is additive rather than synergistic. Overall, we found little evidence that malonate and shikimate act as secondary regulators of citrate, malate and oxalate behavior in soil.  相似文献   

Amphoteric Surfactants for PAH and Lead Polluted-Soil Treatment Using Flotation     

Mouton  Julia  Mercier  Guy  Blais  Jean-François 《Water, air, and soil pollution》2009,199(1-4):381-387

Water, Air, & Soil Pollution - Nineteen soil samples (SE Spain) with very different chemical physical properties and developed over different parent materials were contaminated by adding...  相似文献   

Collaborative development of the Arrowsmith two node search interface designed for laboratory investigators     

Neil R Smalheiser  Vetle I Torvik  Amanda Bischoff-Grethe  Lauren B Burhans  Michael Gabriel  Ramin Homayouni  Alireza Kashef  Maryann E Martone  Guy A Perkins  Diana L Price  Andrew C Talk  Ruth West 《Journal of Biomedical Discovery and Collaboration》2006,1(1):8

Arrowsmith is a unique computer-assisted strategy designed to assist investigators in detecting biologically-relevant connections between two disparate sets of articles in Medline. This paper describes how an inter-institutional consortium of neuroscientists used the UIC Arrowsmith web interface http://arrowsmith.psych.uic.edu in their daily work and guided the development, refinement and expansion of the system into a suite of tools intended for use by the wider scientific community.  相似文献   

Ginkgo biloba Does—and Does Not—Prevent Acute Mountain Sickness     

Guy Leadbetter  Linda E. Keyes  Kirsten M. Maakestad  Sheryl Olson  Martha C. Tissot van Patot  Peter H. Hackett 《The Forestry Chronicle》2009,20(1):66-71

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Baseline demographics of a non‐native lake trout population and inferences for suppression from sensitivity‐elasticity analyses     

B. S. Cox  C. S. Guy  W. A. Fredenberg  L. R. Rosenthal 《Fisheries Management and Ecology》2013,20(5):390-400

Management agencies in several western states of the United States are implementing suppression programmes to control non‐native lake trout, Salvelinus namaycush (Walbaum), for the conservation of native species. This study was implemented to ascertain the population demographics of an expanding lake trout population and use those data to construct an age‐structured model to inform suppression efforts. Population projection matrices were used to model population growth and identify age or stage classes with the greatest influence on population growth. The size and age structure of lake trout sampled was skewed towards juveniles, indicating strong recruitment and a growing population. Matrix‐model simulations corroborated the observed size and age structure, as the lake trout population was predicted to grow exponentially (λ = 1.35, 95% CL: 1.25–1.43) with no suppression efforts. Elasticity analysis of matrix models indicated the relative contribution of survival rates to population growth among immature age classes was equal from age 0 to age at first maturity, but immature survival rates contributed more than adult survival and fertility rates. These results emphasise the importance of targeting juvenile lake trout for suppression efforts during exponential growth in recently established populations.  相似文献