Greenhouse Effect Research Today is a free monthly online journal that collates and summarizes the latest research about Greenhouse Effect, including details on global warming, greenhouse gases, causes, impact. | ||||||
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Effect of pumpkin root exudates on ex situ polychlorinated biphenyl (PCB) phytoextraction by pumpkin and weed species.Ficko SA, Rutter A, Zeeb BA Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, ON, Canada, K7K 7B4. INTRODUCTION: A greenhouse experiment was conducted to determine if Cucurbita pepo ssp. pepo (pumpkin) root exudates could increase the uptake of polychlorinated biphenyls (PCBs) into plants. Contaminated soil was pre-treated with pumpkin root exudates by first growing pumpkins in the soil. Plants (pumpkins and weeds) were grown in the pre-treated (root exudate group) and non-treated (control group) contaminated soils. Seeds from five weed species collected from two contaminated sites were germinated in sufficient quantities (n ≥ 6) for three seedlings to be planted in two groups. DISCUSSION: Plants from both the control group and the root exudate group extracted a combined total of ∼1.2% PCBs from soil. Differences in root concentrations between groups were observed for Bidens cernua (beggar's tick) and in total PCBs extracted into the roots for pumpkins. This is the first report of significant changes in the PCB phytoextraction ability of multiple plant species due to the presence of root exudates. In addition, slight differences were also observed for root and shoot concentrations and extractions by several other species, though these were not statistically different at α = 0.05. While the mechanism of phytoextraction is still unknown, this study indicates that the root exudates of C. pepo ssp. pepo can affect the uptake and transport of contaminants within specific plant species. Published 11 May 2011 in Environ Sci Pollut Res Int. Articles on Greenhouse Effect published 9 May 2011: Highly active oxide photocathode for photoelectrochemical water reduction. Nat Mater. A clean and efficient way to overcome the limited supply of fossil fuels and the greenhouse effect is the production of hydrogen fuel from sunlight and water through the semiconductor/water junction of a photoelectrochemical cell, where energy collection and water electrolysis are combined into a single semiconductor electrode. We present a highly active photocathode for solar H(2) production, consisting of electrodeposited cuprous oxide, which was protected against photocathodic decomposition ... [Abstract] [Full-text] Articles on Greenhouse Effect published 4 May 2011: Acidification of Reverse Micellar Nanodroplets by Atmospheric Pressure CO(2). J Am Chem Soc, 133(18): 7205-14. Water absorption of atmospheric carbon dioxide lowers the solution pH due to carbonic acid formation. Bulk water acidification by CO(2) is well documented, but significantly less is known about its effect on water in confined spaces. Considering its prominence as a greenhouse gas, the importance of aerosols in acid rain, and CO(2)-buffering in cellular systems, surprisingly little information exists about the absorption of CO(2) by nanosized water droplets. The fundamental interactions of CO(2) ... [Abstract] [Full-text] Articles on Greenhouse Effect published 3 May 2011: Effect of the Herbicides Terbuthylazine and Glyphosate on Photosystem II Photochemistry of Young Olive (Olea europaea) Plants. J Agric Food Chem. The purpose of this study was to understand the effect produced by the addition of the herbicides terbuthylazine (N(2)-tert-butyl-6-chloro-N(4)-ethyl-1,3,5-triazine-2,4-diamine) and glyphosate (N-(phosphonomethyl)glycine) on photosystem II photochemistry of young plants of Olea europaea L. under greenhouse conditions. The effect of soil amendment with an organic residue from olive oil production was also assessed. Terbuthylazine reduced the efficiency of photosystem II photochemistry of plants ... [Abstract] [Full-text] Articles on Greenhouse Effect published 2 May 2011: Incorporation of organic waste amendments to a horticultural soil, prior to expected risk periods, could immobilise mineral N, ultimately reducing nitrogen (N) losses as nitrous oxide (N(2)O) and leaching. Two organic waste amendments were selected, a fresh green waste (FGW) and green waste compost (GWC) as they had suitable biochemical attributes to initiate N immobilisation into the microbial biomass and organic N forms. These characteristics include a high C:N ratio (FGW 44:1, GWC 35:1), low ... [Abstract] [Full-text] The biodegradation of methane, a greenhouse gas, and the accumulation of poly-β-hydroxybutyrate (PHB) were studied using a methanotrophic consortium and an isolated strain thereof. The specific rates for methane consumption were 100 and [Formula: see text] for the isolate and the consortium, respectively. Also the effect of including 10% (vv(-1)) of silicone oil in a two-phase partitioning bioreactor (TPPB) was assayed for the elimination of 1% methane in air stream. TPPB allowed a 33-45% ... [Abstract] [Full-text] Arbuscular Mycorrhizal Fungi (AMF) Improved Growth and Nutritional Quality of Greenhouse-Grown Lettuce. J Agric Food Chem. Lettuce can be associated with arbuscular mycorrhizal fungi (AMF). This symbiosis involves a molecular dialogue between fungus and plant that includes the activation of antioxidant, phenylpropanoid, or carotenoid pathways. The objective of this study was to test if the association of lettuce with AMF benefited plant growth and increased the contents of compounds potentially beneficial for human health. Results showed that AMF improved growth of lettuce, thus producing a dilution effect on the ... [Abstract] [Full-text] Articles on Greenhouse Effect published 26 April 2011: Effect of terbuthylazine and glyphosate on photosystem II photochemistry of young olive (Olea europaea)plants. J Agric Food Chem. The purpose of this study was to understand the effect produced by the addition of the herbicides terbuthylazine (N2-tert-butyl-6chloro-N4- ethyl-1, 3, 5-triazine-2, 4-diamine) and glyphosate (N-(phosphonomethyl)glycine) on Photosystem II photochemistry of young plants of Olea europaea L under greenhouse conditions. The effect of soil amendment with an organic residue from olive oil production was also assessed. Terbuthylazine reduced the efficiency of photosystem II photochemistry of plants ... [Abstract] [Full-text] Articles on Greenhouse Effect published 25 April 2011: Effect of Localizing Fruit and Vegetable Consumption on Greenhouse Gas Emissions and Nutrition, Santa Barbara County. Environ Sci Technol. The US agrifood system is very productive, but highly centralized and resource intensive with very weak links between production and consumption. This contributes to high levels of malnutrition and greenhouse gas emissions (GHGE). A popular approach to improvement is localization-reducing direct transport (farm to retail distance, or "food miles"). We examined Santa Barbara County (SBC) California, which mirrors the high production, nutritional and environmental problems, and growing ... [Abstract] [Full-text] © 2005-2011 Greenhouse Effect Research Today. All Rights Reserved. |
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