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Mikhail V. Zubkov - One of the best experts on this subject based on the ideXlab platform.
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Comparable light stimulation of Organic Nutrient uptake by SAR11 and Prochlorococcus in the North Atlantic subtropical gyre
The ISME Journal, 2013Co-Authors: Paola R Gómez-pereira, Manuela Hartmann, David J. Scanlan, Bernhard M Fuchs, Carolina Grob, Glen A Tarran, Adrian P Martin, Mikhail V. ZubkovAbstract:Subtropical oceanic gyres are the most extensive biomes on Earth where SAR11 and Prochlorococcus bacterioplankton numerically dominate the surface waters depleted in inOrganic macroNutrients as well as in dissolved Organic matter. In such Nutrient poor conditions bacterioplankton could become photoheterotrophic, that is, potentially enhance uptake of scarce Organic molecules using the available solar radiation to energise appropriate transport systems. Here, we assessed the photoheterotrophy of the key microbial taxa in the North Atlantic oligotrophic gyre and adjacent regions using ^33P-ATP, ^3H-ATP and ^35S-methionine tracers. Light-stimulated uptake of these substrates was assessed in two dominant bacterioplankton groups discriminated by flow cytometric sorting of tracer-labelled cells and identified using catalysed reporter deposition fluorescence in situ hybridisation. One group of cells, encompassing 48% of all bacterioplankton, were identified as members of the SAR11 clade, whereas the other group (24% of all bacterioplankton) was Prochlorococcus . When exposed to light, SAR11 cells took 31% more ATP and 32% more methionine, whereas the Prochlorococcus cells took 33% more ATP and 34% more methionine. Other bacterioplankton did not demonstrate light stimulation. Thus, the SAR11 and Prochlorococcus groups, with distinctly different light-harvesting mechanisms, used light equally to enhance, by approximately one-third, the uptake of different types of Organic molecules. Our findings indicate the significance of light-driven uptake of essential Organic Nutrients by the dominant bacterioplankton groups in the surface waters of one of the less productive, vast regions of the world’s oceans—the oligotrophic North Atlantic subtropical gyre.
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comparable light stimulation of Organic Nutrient uptake by sar11 and prochlorococcus in the north atlantic subtropical gyre
The ISME Journal, 2013Co-Authors: Paola R Gomezpereira, Manuela Hartmann, David J. Scanlan, Bernhard M Fuchs, Carolina Grob, Glen A Tarran, Adrian Martin, Mikhail V. ZubkovAbstract:Subtropical oceanic gyres are the most extensive biomes on Earth where SAR11 and Prochlorococcus bacterioplankton numerically dominate the surface waters depleted in inOrganic macroNutrients as well as in dissolved Organic matter. In such Nutrient poor conditions bacterioplankton could become photoheterotrophic, that is, potentially enhance uptake of scarce Organic molecules using the available solar radiation to energise appropriate transport systems. Here, we assessed the photoheterotrophy of the key microbial taxa in the North Atlantic oligotrophic gyre and adjacent regions using 33P-ATP, 3H-ATP and 35S-methionine tracers. Light-stimulated uptake of these substrates was assessed in two dominant bacterioplankton groups discriminated by flow cytometric sorting of tracer-labelled cells and identified using catalysed reporter deposition fluorescence in situ hybridisation. One group of cells, encompassing 48% of all bacterioplankton, were identified as members of the SAR11 clade, whereas the other group (24% of all bacterioplankton) was Prochlorococcus. When exposed to light, SAR11 cells took 31% more ATP and 32% more methionine, whereas the Prochlorococcus cells took 33% more ATP and 34% more methionine. Other bacterioplankton did not demonstrate light stimulation. Thus, the SAR11 and Prochlorococcus groups, with distinctly different light-harvesting mechanisms, used light equally to enhance, by approximately one-third, the uptake of different types of Organic molecules. Our findings indicate the significance of light-driven uptake of essential Organic Nutrients by the dominant bacterioplankton groups in the surface waters of one of the less productive, vast regions of the world’s oceans—the oligotrophic North Atlantic subtropical gyre.
Paul Mapfumo - One of the best experts on this subject based on the ideXlab platform.
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zinc fertilization increases productivity and grain nutritional quality of cowpea vigna unguiculata l walp under integrated soil fertility management
Field Crops Research, 2017Co-Authors: Muneta G Manzeke, Florence Mtambanengwe, H Nezomba, Michael J Watts, Martin R. Broadley, Paul MapfumoAbstract:Cowpea (Vigna unguiculata [L.] Walp.) is an important but under-studied grain legume which can potentially contribute to improved dietary zinc (Zn) intake in sub-Saharan Africa. In this study, surveys were conducted on smallholder farms in Zimbabwe during 2014/15 to determine the influence of diverse soil fertility management options on cowpea grain productivity and nutrition quality. Guided by the surveys, field experiments were conducted to investigate the influence of Zn fertilizer on the productivity and quality of cowpea under integrated soil fertility management (ISFM). Experiments were conducted on two soil-types, namely, sandy (6% clay) and red clay (57% clay) in 2014/15 and 2015/16 where cowpea was grown in rotation with staple maize (Zea mays L.) and fertilized with combinations of Zn, nitrogen (N), phosphorus (P) and two Organic Nutrient resources, cattle manure and woodland leaf litter. Cowpea grain yields on surveyed farms ranged from 0.3 to 0.9 t ha−1, with grain Zn concentration ranging from 23.9 to 30.1 mg kg−1. The highest grain Zn concentration was on fields where Organic Nutrient resources were applied in combination with mineral N and P fertilizers. Within the field experiments, mean grain yields of cowpea increased by between 12 and 18% on both soil types when Zn fertilizer was applied, from a baseline of 1.6 and 1.1 t ha−1 on red clay and sandy soils, respectively. When Zn fertilizer was co-applied with Organic Nutrient resources, grain Zn concentrations of cowpea reached 42.1 mg kg−1 (red clay) and 44.7 mg kg−1 (sandy) against grain Zn concentrations of 35.9 mg kg−1 and 31.1 mg kg−1 measured in cowpea grown with no Zn fertilizer on red clay and sandy soils, respectively. Agronomic biofortification of legumes is feasible and has the potential to contribute significantly towards increasing dietary Zn intake by humans. A greater increase in grain Zn of cowpea grown on sandy than red clay soils under Zn fertilization illustrates the influence of soil type on Zn uptake, which should be explored further in agronomic biofortification programs.
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Smallholder farmer management impacts on particulate and labile carbon fractions of granitic sandy soils in Zimbabwe
Nutrient Cycling in Agroecosystems, 2008Co-Authors: Florence Mtambanengwe, Paul MapfumoAbstract:Crop production in maize-based smallholder farming systems of Southern Africa is hampered by lack of options for efficiently managing limited and different quality Organic Nutrient resources. This study examined impacts of farmers’ short- and long-term Organic resource allocation patterns on sizes and quality of soil Organic matter (SOM) fractions. Farmers’ most- (rich) and least- (poor) productive fields were studied for two seasons under low (450–650 mm yr^−1) to high (>750 mm yr^−1) rainfall areas in Zimbabwe, on Lixisols with ∼6% clay and 88% sand. Rich fields received 0.5–14 Mg C ha^−1 compared with 25 mg N kg^−1) materials increased labile C (KMnO_4 oxidizable) in top 60 cm of soil profile, with 1.6 Mg C ha^−1 of Crotalaria juncea yielding labile C amounts similar to 6 Mg C ha^−1 of manure. Labile C was significantly related to mineralizable N in POM fractions, and apparently to maize yields ( P
Carolina Grob - One of the best experts on this subject based on the ideXlab platform.
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Comparable light stimulation of Organic Nutrient uptake by SAR11 and Prochlorococcus in the North Atlantic subtropical gyre
The ISME Journal, 2013Co-Authors: Paola R Gómez-pereira, Manuela Hartmann, David J. Scanlan, Bernhard M Fuchs, Carolina Grob, Glen A Tarran, Adrian P Martin, Mikhail V. ZubkovAbstract:Subtropical oceanic gyres are the most extensive biomes on Earth where SAR11 and Prochlorococcus bacterioplankton numerically dominate the surface waters depleted in inOrganic macroNutrients as well as in dissolved Organic matter. In such Nutrient poor conditions bacterioplankton could become photoheterotrophic, that is, potentially enhance uptake of scarce Organic molecules using the available solar radiation to energise appropriate transport systems. Here, we assessed the photoheterotrophy of the key microbial taxa in the North Atlantic oligotrophic gyre and adjacent regions using ^33P-ATP, ^3H-ATP and ^35S-methionine tracers. Light-stimulated uptake of these substrates was assessed in two dominant bacterioplankton groups discriminated by flow cytometric sorting of tracer-labelled cells and identified using catalysed reporter deposition fluorescence in situ hybridisation. One group of cells, encompassing 48% of all bacterioplankton, were identified as members of the SAR11 clade, whereas the other group (24% of all bacterioplankton) was Prochlorococcus . When exposed to light, SAR11 cells took 31% more ATP and 32% more methionine, whereas the Prochlorococcus cells took 33% more ATP and 34% more methionine. Other bacterioplankton did not demonstrate light stimulation. Thus, the SAR11 and Prochlorococcus groups, with distinctly different light-harvesting mechanisms, used light equally to enhance, by approximately one-third, the uptake of different types of Organic molecules. Our findings indicate the significance of light-driven uptake of essential Organic Nutrients by the dominant bacterioplankton groups in the surface waters of one of the less productive, vast regions of the world’s oceans—the oligotrophic North Atlantic subtropical gyre.
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comparable light stimulation of Organic Nutrient uptake by sar11 and prochlorococcus in the north atlantic subtropical gyre
The ISME Journal, 2013Co-Authors: Paola R Gomezpereira, Manuela Hartmann, David J. Scanlan, Bernhard M Fuchs, Carolina Grob, Glen A Tarran, Adrian Martin, Mikhail V. ZubkovAbstract:Subtropical oceanic gyres are the most extensive biomes on Earth where SAR11 and Prochlorococcus bacterioplankton numerically dominate the surface waters depleted in inOrganic macroNutrients as well as in dissolved Organic matter. In such Nutrient poor conditions bacterioplankton could become photoheterotrophic, that is, potentially enhance uptake of scarce Organic molecules using the available solar radiation to energise appropriate transport systems. Here, we assessed the photoheterotrophy of the key microbial taxa in the North Atlantic oligotrophic gyre and adjacent regions using 33P-ATP, 3H-ATP and 35S-methionine tracers. Light-stimulated uptake of these substrates was assessed in two dominant bacterioplankton groups discriminated by flow cytometric sorting of tracer-labelled cells and identified using catalysed reporter deposition fluorescence in situ hybridisation. One group of cells, encompassing 48% of all bacterioplankton, were identified as members of the SAR11 clade, whereas the other group (24% of all bacterioplankton) was Prochlorococcus. When exposed to light, SAR11 cells took 31% more ATP and 32% more methionine, whereas the Prochlorococcus cells took 33% more ATP and 34% more methionine. Other bacterioplankton did not demonstrate light stimulation. Thus, the SAR11 and Prochlorococcus groups, with distinctly different light-harvesting mechanisms, used light equally to enhance, by approximately one-third, the uptake of different types of Organic molecules. Our findings indicate the significance of light-driven uptake of essential Organic Nutrients by the dominant bacterioplankton groups in the surface waters of one of the less productive, vast regions of the world’s oceans—the oligotrophic North Atlantic subtropical gyre.
David J. Scanlan - One of the best experts on this subject based on the ideXlab platform.
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Comparable light stimulation of Organic Nutrient uptake by SAR11 and Prochlorococcus in the North Atlantic subtropical gyre
The ISME Journal, 2013Co-Authors: Paola R Gómez-pereira, Manuela Hartmann, David J. Scanlan, Bernhard M Fuchs, Carolina Grob, Glen A Tarran, Adrian P Martin, Mikhail V. ZubkovAbstract:Subtropical oceanic gyres are the most extensive biomes on Earth where SAR11 and Prochlorococcus bacterioplankton numerically dominate the surface waters depleted in inOrganic macroNutrients as well as in dissolved Organic matter. In such Nutrient poor conditions bacterioplankton could become photoheterotrophic, that is, potentially enhance uptake of scarce Organic molecules using the available solar radiation to energise appropriate transport systems. Here, we assessed the photoheterotrophy of the key microbial taxa in the North Atlantic oligotrophic gyre and adjacent regions using ^33P-ATP, ^3H-ATP and ^35S-methionine tracers. Light-stimulated uptake of these substrates was assessed in two dominant bacterioplankton groups discriminated by flow cytometric sorting of tracer-labelled cells and identified using catalysed reporter deposition fluorescence in situ hybridisation. One group of cells, encompassing 48% of all bacterioplankton, were identified as members of the SAR11 clade, whereas the other group (24% of all bacterioplankton) was Prochlorococcus . When exposed to light, SAR11 cells took 31% more ATP and 32% more methionine, whereas the Prochlorococcus cells took 33% more ATP and 34% more methionine. Other bacterioplankton did not demonstrate light stimulation. Thus, the SAR11 and Prochlorococcus groups, with distinctly different light-harvesting mechanisms, used light equally to enhance, by approximately one-third, the uptake of different types of Organic molecules. Our findings indicate the significance of light-driven uptake of essential Organic Nutrients by the dominant bacterioplankton groups in the surface waters of one of the less productive, vast regions of the world’s oceans—the oligotrophic North Atlantic subtropical gyre.
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comparable light stimulation of Organic Nutrient uptake by sar11 and prochlorococcus in the north atlantic subtropical gyre
The ISME Journal, 2013Co-Authors: Paola R Gomezpereira, Manuela Hartmann, David J. Scanlan, Bernhard M Fuchs, Carolina Grob, Glen A Tarran, Adrian Martin, Mikhail V. ZubkovAbstract:Subtropical oceanic gyres are the most extensive biomes on Earth where SAR11 and Prochlorococcus bacterioplankton numerically dominate the surface waters depleted in inOrganic macroNutrients as well as in dissolved Organic matter. In such Nutrient poor conditions bacterioplankton could become photoheterotrophic, that is, potentially enhance uptake of scarce Organic molecules using the available solar radiation to energise appropriate transport systems. Here, we assessed the photoheterotrophy of the key microbial taxa in the North Atlantic oligotrophic gyre and adjacent regions using 33P-ATP, 3H-ATP and 35S-methionine tracers. Light-stimulated uptake of these substrates was assessed in two dominant bacterioplankton groups discriminated by flow cytometric sorting of tracer-labelled cells and identified using catalysed reporter deposition fluorescence in situ hybridisation. One group of cells, encompassing 48% of all bacterioplankton, were identified as members of the SAR11 clade, whereas the other group (24% of all bacterioplankton) was Prochlorococcus. When exposed to light, SAR11 cells took 31% more ATP and 32% more methionine, whereas the Prochlorococcus cells took 33% more ATP and 34% more methionine. Other bacterioplankton did not demonstrate light stimulation. Thus, the SAR11 and Prochlorococcus groups, with distinctly different light-harvesting mechanisms, used light equally to enhance, by approximately one-third, the uptake of different types of Organic molecules. Our findings indicate the significance of light-driven uptake of essential Organic Nutrients by the dominant bacterioplankton groups in the surface waters of one of the less productive, vast regions of the world’s oceans—the oligotrophic North Atlantic subtropical gyre.
Manuela Hartmann - One of the best experts on this subject based on the ideXlab platform.
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Comparable light stimulation of Organic Nutrient uptake by SAR11 and Prochlorococcus in the North Atlantic subtropical gyre
The ISME Journal, 2013Co-Authors: Paola R Gómez-pereira, Manuela Hartmann, David J. Scanlan, Bernhard M Fuchs, Carolina Grob, Glen A Tarran, Adrian P Martin, Mikhail V. ZubkovAbstract:Subtropical oceanic gyres are the most extensive biomes on Earth where SAR11 and Prochlorococcus bacterioplankton numerically dominate the surface waters depleted in inOrganic macroNutrients as well as in dissolved Organic matter. In such Nutrient poor conditions bacterioplankton could become photoheterotrophic, that is, potentially enhance uptake of scarce Organic molecules using the available solar radiation to energise appropriate transport systems. Here, we assessed the photoheterotrophy of the key microbial taxa in the North Atlantic oligotrophic gyre and adjacent regions using ^33P-ATP, ^3H-ATP and ^35S-methionine tracers. Light-stimulated uptake of these substrates was assessed in two dominant bacterioplankton groups discriminated by flow cytometric sorting of tracer-labelled cells and identified using catalysed reporter deposition fluorescence in situ hybridisation. One group of cells, encompassing 48% of all bacterioplankton, were identified as members of the SAR11 clade, whereas the other group (24% of all bacterioplankton) was Prochlorococcus . When exposed to light, SAR11 cells took 31% more ATP and 32% more methionine, whereas the Prochlorococcus cells took 33% more ATP and 34% more methionine. Other bacterioplankton did not demonstrate light stimulation. Thus, the SAR11 and Prochlorococcus groups, with distinctly different light-harvesting mechanisms, used light equally to enhance, by approximately one-third, the uptake of different types of Organic molecules. Our findings indicate the significance of light-driven uptake of essential Organic Nutrients by the dominant bacterioplankton groups in the surface waters of one of the less productive, vast regions of the world’s oceans—the oligotrophic North Atlantic subtropical gyre.
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comparable light stimulation of Organic Nutrient uptake by sar11 and prochlorococcus in the north atlantic subtropical gyre
The ISME Journal, 2013Co-Authors: Paola R Gomezpereira, Manuela Hartmann, David J. Scanlan, Bernhard M Fuchs, Carolina Grob, Glen A Tarran, Adrian Martin, Mikhail V. ZubkovAbstract:Subtropical oceanic gyres are the most extensive biomes on Earth where SAR11 and Prochlorococcus bacterioplankton numerically dominate the surface waters depleted in inOrganic macroNutrients as well as in dissolved Organic matter. In such Nutrient poor conditions bacterioplankton could become photoheterotrophic, that is, potentially enhance uptake of scarce Organic molecules using the available solar radiation to energise appropriate transport systems. Here, we assessed the photoheterotrophy of the key microbial taxa in the North Atlantic oligotrophic gyre and adjacent regions using 33P-ATP, 3H-ATP and 35S-methionine tracers. Light-stimulated uptake of these substrates was assessed in two dominant bacterioplankton groups discriminated by flow cytometric sorting of tracer-labelled cells and identified using catalysed reporter deposition fluorescence in situ hybridisation. One group of cells, encompassing 48% of all bacterioplankton, were identified as members of the SAR11 clade, whereas the other group (24% of all bacterioplankton) was Prochlorococcus. When exposed to light, SAR11 cells took 31% more ATP and 32% more methionine, whereas the Prochlorococcus cells took 33% more ATP and 34% more methionine. Other bacterioplankton did not demonstrate light stimulation. Thus, the SAR11 and Prochlorococcus groups, with distinctly different light-harvesting mechanisms, used light equally to enhance, by approximately one-third, the uptake of different types of Organic molecules. Our findings indicate the significance of light-driven uptake of essential Organic Nutrients by the dominant bacterioplankton groups in the surface waters of one of the less productive, vast regions of the world’s oceans—the oligotrophic North Atlantic subtropical gyre.