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Sanjeev Maken - One of the best experts on this subject based on the ideXlab platform.
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volumetric studies of isomers of propanol and butanol with n decane flory treszczanowicz Benson model and prigogine flory patterson theory
Journal of Molecular Liquids, 2017Co-Authors: Suman Gahlyan, Sweety Verma, Manju Rani, Sanjeev MakenAbstract:Abstract Excess molar volumes ( V m E ) of propanol and butanol (1) + n -decane (2) systems were measured at 298.15 K. The V m E data at x 1 = 0.5, vary as: tert -butanol > sec -butanol > isopropanol > n -propanol > isobutanol > n -butanol. The V m E data were interpreted in terms of Flory–Treszczanowicz–Benson model and Prigogine–Flory–Patterson theory. While both the models correctly described the sign and shape of curves, the values calculated by Flory–Treszczanowicz–Benson model compared reasonably well with the respective measured data. Partial, excess partial and apparent molar volumes of these alcohols with n -decane were also computed from V m E data.
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excess molar enthalpies of binary mixtures of formamide with butanol at 298 15 k application of prigogine flory patterson theory and treszczanowicz Benson association model
Journal of Industrial and Engineering Chemistry, 2013Co-Authors: Manju Rani, Shalu Agarwal, Priyanka Lahot, Sanjeev MakenAbstract:Abstract Excess molar enthalpies ( H m E ) of formamide (1) + 1-butanol or 2-methyl-1-propanol or 2-methyl-2-propanol (2) mixtures have been measured at 298.15 K over the entire composition range using flow micro calorimeter. The excess enthalpy data along with previously published excess volumes data ( V m E ) (M. Rani, S. Maken, J. Ind. Eng. Chem. 18 (2012) 1694) have been utilised to study the thermodynamics of molecular interactions in terms of Prigogine–Flory–Patterson theory and Treszczanowicz–Benson association model with a Flory contribution term. The Treszczanowicz–Benson model was developed for alkane + alkanol systems considering Mecke–Kempter type of association in alkanol. In this paper the Treszczanowicz–Benson association model was applied, for the first time, to binary mixtures containing both components associated (butanol and formamide) through hydrogen bonding. In both the cases, when either of formamide or butanol was assumed to be associated, the calculated H m E and V m E values compared reasonably well with the corresponding experimental data, but the agreement is not very impressive for excess enthalpy in formamide + 2-methyl-2-propanol mixtures. Extent of inter-molecular H-bonding in formamide and butanols in their binary mixtures was also reflected in their molar enthalpy of association of H-bonding Δ h H 0 .
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excess molar enthalpies and excess molar volumes of formamide 1 propanol or 2 propanol and thermodynamic modeling by prigogine flory patterson theory and treszczanowicz Benson association model
Thermochimica Acta, 2013Co-Authors: Manju Rani, Sanjeev MakenAbstract:Abstract Excess molar enthalpies ( H m E ) at 298.15 K and 308.15 K and excess molar volumes ( V m E ) at 308.15 K for formamide (1) + 1-propanol or 2-propanol (2) mixtures have been measured over the entire composition range. The excess enthalpies and excess volumes data have been utilized to study the thermodynamics of molecular interactions in terms of Prigogine–Flory–Patterson theory and Treszczanowicz–Benson association model with a Flory contribution term. In this paper, this Treszczanowicz–Benson association model was applied, for the first time, to binary mixtures containing both components associated (propanol and formamide) through hydrogen bonding. In both the cases, when either of formamide or propanol was assumed to be associated, the calculated H m E and V m E values compared well with corresponding experimental data. Extent of inter-molecular H-bonding in formamide and propanol in their binary mixtures was also reflected in their molar enthalpy of association of H-bonding Δ h H 0 and association constant KH.
Yumiko Sakuragi - One of the best experts on this subject based on the ideXlab platform.
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overexpression of bifunctional fructose 1 6 bisphosphatase sedoheptulose 1 7 bisphosphatase leads to enhanced photosynthesis and global reprogramming of carbon metabolism in synechococcus sp pcc 7002
Metabolic Engineering, 2018Co-Authors: Alice Jara De Porcellinis, Hanne Norgaard, Laura Maria Furelos Brey, Simon Matthe Erstad, Patrik R Jones, Joshua L Heazlewood, Yumiko SakuragiAbstract:Cyanobacteria fix atmospheric CO2 to biomass and through metabolic engineering can also act as photosynthetic factories for sustainable productions of fuels and chemicals. The Calvin Benson cycle is the primary pathway for CO2 fixation in cyanobacteria, algae and C3 plants. Previous studies have overexpressed the Calvin Benson cycle enzymes, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) and bifunctional sedoheptulose-1,7-bisphosphatase/fructose-1,6-bisphosphatase (hereafter BiBPase), in both plants and algae, although their impacts on cyanobacteria have not yet been rigorously studied. Here, we show that overexpression of BiBPase and RuBisCO have distinct impacts on carbon metabolism in the cyanobacterium Synechococcus sp. PCC 7002 through physiological, biochemical, and proteomic analyses. The former enhanced growth, cell size, and photosynthetic O2 evolution, and coordinately upregulated enzymes in the Calvin Benson cycle including RuBisCO and fructose-1,6-bisphosphate aldolase. At the same time it downregulated enzymes in respiratory carbon metabolism (glycolysis and the oxidative pentose phosphate pathway) including glucose-6-phosphate dehydrogenase (G6PDH). The content of glycogen was also significantly reduced while the soluble carbohydrate content increased. These results indicate that overexpression of BiBPase leads to global reprogramming of carbon metabolism in Synechococcus sp. PCC 7002, promoting photosynthetic carbon fixation and carbon partitioning towards non-storage carbohydrates. In contrast, whilst overexpression of RuBisCO had no measurable impact on growth and photosynthetic O2 evolution, it led to coordinated increase in the abundance of proteins involved in pyruvate metabolism and fatty acid biosynthesis. Our results underpin that singular genetic modifications in the Calvin Benson cycle can have far broader cellular impact than previously expected. These features could be exploited to more efficiently direct carbons towards desired bioproducts.
Manju Rani - One of the best experts on this subject based on the ideXlab platform.
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volumetric studies of isomers of propanol and butanol with n decane flory treszczanowicz Benson model and prigogine flory patterson theory
Journal of Molecular Liquids, 2017Co-Authors: Suman Gahlyan, Sweety Verma, Manju Rani, Sanjeev MakenAbstract:Abstract Excess molar volumes ( V m E ) of propanol and butanol (1) + n -decane (2) systems were measured at 298.15 K. The V m E data at x 1 = 0.5, vary as: tert -butanol > sec -butanol > isopropanol > n -propanol > isobutanol > n -butanol. The V m E data were interpreted in terms of Flory–Treszczanowicz–Benson model and Prigogine–Flory–Patterson theory. While both the models correctly described the sign and shape of curves, the values calculated by Flory–Treszczanowicz–Benson model compared reasonably well with the respective measured data. Partial, excess partial and apparent molar volumes of these alcohols with n -decane were also computed from V m E data.
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excess molar enthalpies of binary mixtures of formamide with butanol at 298 15 k application of prigogine flory patterson theory and treszczanowicz Benson association model
Journal of Industrial and Engineering Chemistry, 2013Co-Authors: Manju Rani, Shalu Agarwal, Priyanka Lahot, Sanjeev MakenAbstract:Abstract Excess molar enthalpies ( H m E ) of formamide (1) + 1-butanol or 2-methyl-1-propanol or 2-methyl-2-propanol (2) mixtures have been measured at 298.15 K over the entire composition range using flow micro calorimeter. The excess enthalpy data along with previously published excess volumes data ( V m E ) (M. Rani, S. Maken, J. Ind. Eng. Chem. 18 (2012) 1694) have been utilised to study the thermodynamics of molecular interactions in terms of Prigogine–Flory–Patterson theory and Treszczanowicz–Benson association model with a Flory contribution term. The Treszczanowicz–Benson model was developed for alkane + alkanol systems considering Mecke–Kempter type of association in alkanol. In this paper the Treszczanowicz–Benson association model was applied, for the first time, to binary mixtures containing both components associated (butanol and formamide) through hydrogen bonding. In both the cases, when either of formamide or butanol was assumed to be associated, the calculated H m E and V m E values compared reasonably well with the corresponding experimental data, but the agreement is not very impressive for excess enthalpy in formamide + 2-methyl-2-propanol mixtures. Extent of inter-molecular H-bonding in formamide and butanols in their binary mixtures was also reflected in their molar enthalpy of association of H-bonding Δ h H 0 .
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excess molar enthalpies and excess molar volumes of formamide 1 propanol or 2 propanol and thermodynamic modeling by prigogine flory patterson theory and treszczanowicz Benson association model
Thermochimica Acta, 2013Co-Authors: Manju Rani, Sanjeev MakenAbstract:Abstract Excess molar enthalpies ( H m E ) at 298.15 K and 308.15 K and excess molar volumes ( V m E ) at 308.15 K for formamide (1) + 1-propanol or 2-propanol (2) mixtures have been measured over the entire composition range. The excess enthalpies and excess volumes data have been utilized to study the thermodynamics of molecular interactions in terms of Prigogine–Flory–Patterson theory and Treszczanowicz–Benson association model with a Flory contribution term. In this paper, this Treszczanowicz–Benson association model was applied, for the first time, to binary mixtures containing both components associated (propanol and formamide) through hydrogen bonding. In both the cases, when either of formamide or propanol was assumed to be associated, the calculated H m E and V m E values compared well with corresponding experimental data. Extent of inter-molecular H-bonding in formamide and propanol in their binary mixtures was also reflected in their molar enthalpy of association of H-bonding Δ h H 0 and association constant KH.
Alice Jara De Porcellinis - One of the best experts on this subject based on the ideXlab platform.
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overexpression of bifunctional fructose 1 6 bisphosphatase sedoheptulose 1 7 bisphosphatase leads to enhanced photosynthesis and global reprogramming of carbon metabolism in synechococcus sp pcc 7002
Metabolic Engineering, 2018Co-Authors: Alice Jara De Porcellinis, Hanne Norgaard, Laura Maria Furelos Brey, Simon Matthe Erstad, Patrik R Jones, Joshua L Heazlewood, Yumiko SakuragiAbstract:Cyanobacteria fix atmospheric CO2 to biomass and through metabolic engineering can also act as photosynthetic factories for sustainable productions of fuels and chemicals. The Calvin Benson cycle is the primary pathway for CO2 fixation in cyanobacteria, algae and C3 plants. Previous studies have overexpressed the Calvin Benson cycle enzymes, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) and bifunctional sedoheptulose-1,7-bisphosphatase/fructose-1,6-bisphosphatase (hereafter BiBPase), in both plants and algae, although their impacts on cyanobacteria have not yet been rigorously studied. Here, we show that overexpression of BiBPase and RuBisCO have distinct impacts on carbon metabolism in the cyanobacterium Synechococcus sp. PCC 7002 through physiological, biochemical, and proteomic analyses. The former enhanced growth, cell size, and photosynthetic O2 evolution, and coordinately upregulated enzymes in the Calvin Benson cycle including RuBisCO and fructose-1,6-bisphosphate aldolase. At the same time it downregulated enzymes in respiratory carbon metabolism (glycolysis and the oxidative pentose phosphate pathway) including glucose-6-phosphate dehydrogenase (G6PDH). The content of glycogen was also significantly reduced while the soluble carbohydrate content increased. These results indicate that overexpression of BiBPase leads to global reprogramming of carbon metabolism in Synechococcus sp. PCC 7002, promoting photosynthetic carbon fixation and carbon partitioning towards non-storage carbohydrates. In contrast, whilst overexpression of RuBisCO had no measurable impact on growth and photosynthetic O2 evolution, it led to coordinated increase in the abundance of proteins involved in pyruvate metabolism and fatty acid biosynthesis. Our results underpin that singular genetic modifications in the Calvin Benson cycle can have far broader cellular impact than previously expected. These features could be exploited to more efficiently direct carbons towards desired bioproducts.
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Overexpression of bifunctional fructose-1,6-bisphosphatase/sedoheptulose-1,7-bisphosphatase leads to enhanced photosynthesis and global reprogramming of carbon metabolism in Synechococcus sp PCC 7002
'Elsevier BV', 2018Co-Authors: Alice Jara De Porcellinis, Simon Matthe Erstad, Joshua L Heazlewood, Norgaard H, Brey Lmf, Pr Jones, Sakuragi YAbstract:Cyanobacteria fix atmospheric CO2 to biomass and through metabolic engineering can also act as photosynthetic factories for sustainable productions of fuels and chemicals. The Calvin Benson cycle is the primary pathway for CO2 fixation in cyanobacteria, algae and C3 plants. Previous studies have overexpressed the Calvin Benson cycle enzymes, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) and bifunctional sedoheptulose-1,7-bisphosphatase/fructose-1,6-bisphosphatase (hereafter BiBPase), in both plants and algae, although their impacts on cyanobacteria have not yet been rigorously studied. Here, we show that overexpression of BiBPase and RuBisCO have distinct impacts on carbon metabolism in the cyanobacterium Synechococcus sp. PCC 7002 through physiological, biochemical, and proteomic analyses. The former enhanced growth, cell size, and photosynthetic O2 evolution, and coordinately upregulated enzymes in the Calvin Benson cycle including RuBisCO and fructose-1,6-bisphosphate aldolase. At the same time it downregulated enzymes in respiratory carbon metabolism (glycolysis and the oxidative pentose phosphate pathway) including glucose-6-phosphate dehydrogenase (G6PDH). The content of glycogen was also significantly reduced while the soluble carbohydrate content increased. These results indicate that overexpression of BiBPase leads to global reprogramming of carbon metabolism in Synechococcus sp. PCC 7002, promoting photosynthetic carbon fixation and carbon partitioning towards non-storage carbohydrates. In contrast, whilst overexpression of RuBisCO had no measurable impact on growth and photosynthetic O2 evolution, it led to coordinated increase in the abundance of proteins involved in pyruvate metabolism and fatty acid biosynthesis. Our results underpin that singular genetic modifications in the Calvin Benson cycle can have far broader cellular impact than previously expected. These features could be exploited to more efficiently direct carbons towards desired bioproducts
Heather E Arends - One of the best experts on this subject based on the ideXlab platform.
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application of single grain osl dating to ice proximal deposits glacial lake Benson west central minnesota usa
Quaternary Geochronology, 2015Co-Authors: Tammy M Rittenour, James F P Cotter, Heather E ArendsAbstract:Abstract Glacial Lake Benson formed in west-central Minnesota as the Des Moines lobe of the Laurentide ice sheet retreated north of a small moraine in the Minnesota River lowland. Although previous research has constrained the timing of glacial Lake Agassiz immediately to the north, little age control is available for the formation of glacial Lake Benson and ice-marginal positions to the south. In order to constrain the age of glacial Lake Benson and test the application of single-grain optically stimulated luminescence (OSL) dating to ice-marginal deposits, seven OSL samples were collected from a variety of depositional settings. These included deltaic deposits linked to specific lake levels, pro-glacial fluvial, ice-contact and supra-glacial deposits. Single-grain OSL results indicate evidence for incomplete resetting (partial bleaching) of the luminescence signal, as expected for glacial environments, and therefore ages were calculated using a minimum age model. OSL results constrain the timing of ice-margin retreat and lake formation to 14.4–14.8 ka. Analysis of single-grain equivalent dose distributions indicates that deposits created by glacial-dominated processes typically had higher over-dispersion (>50%) and greater positive skew (>0.9) than deposits originating from fluvial processes. These results suggest that water-lain deposits should be targeted for OSL sampling over those created by glacial processes when dating ice-proximal settings.
