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Henry Svensson - One of the best experts on this subject based on the ideXlab platform.
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Plasma proteins in a standardised skin mini-erosion (I): permeability changes as a Function of Time.
BMC dermatology, 2002Co-Authors: Christer Svedman, Terence J. Ryan, Henry SvenssonAbstract:Background A standardised technique using a suction-induced mini-erosion that allows serial sampling of dermal interstitial fluid (IF) for 5 to 6 days has been described. In the present study, we studied permeability changes as a Function of Time.
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Plasma proteins in a standardised skin mini-erosion (I): permeability changes as a Function of Time
BMC Dermatology, 2002Co-Authors: Christer Svedman, Terence J. Ryan, Bing B Yu, Henry SvenssonAbstract:Background A standardised technique using a suction-induced mini-erosion that allows serial sampling of dermal interstitial fluid (IF) for 5 to 6 days has been described. In the present study, we studied permeability changes as a Function of Time. Methods We examined IF concentrations of total protein concentration and the concentration of insulin (6.6 kDa), prealbumin (55 kDa), albumin (66 kDa), transferrin (80 kDa), IgG (150 kDa) and alpha-2-macroglobulin (720 kDa) as a Function of Time, using an extraction pressure of 200 mmHg below atmospheric. Results At 0 h after forming the erosion, mean total IF protein content (relative to plasma) was 26 ± 13% (SD). For the individual proteins, the relative mean concentrations were 65 ± 36% for insulin, 48 ± 12% for albumin, 30 ± 19% for transferrin, 31 ± 15%for IgG and 19.5 ± 10% for alpha-2-macroglobulin. At 24 h, the total IF protein content was higher than at 0 h (56 ± 26% vs 26 ± 13%; p < 0.05, diff: 115%), as were some of the individual protein concentrations: prealbumin (50 ± 24 vs 25 ± 13%; p < 0.05), albumin (68 ± 21 vs 48 ± 12%; p < 0.05) and IgG (55 ± 30 vs 31 ± 15%; p = 0.05). ln the interval 24 h to 96 h the concentrations were relatively unchanged. Conclusions The results indicate that fluid sampled at 0 h after forming the erosion represents dermal IF before the full onset of inflammation. From 24 h onward, the sampled fluid reflects a steady state of increased permeability induced by inflammation. This technique is promising as a tool for clinically sampling substances that are freely distributed in the body and as a model for studying inflammation and vascular permeability.
Christer Svedman - One of the best experts on this subject based on the ideXlab platform.
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Plasma proteins in a standardised skin mini-erosion (I): permeability changes as a Function of Time.
BMC dermatology, 2002Co-Authors: Christer Svedman, Terence J. Ryan, Henry SvenssonAbstract:Background A standardised technique using a suction-induced mini-erosion that allows serial sampling of dermal interstitial fluid (IF) for 5 to 6 days has been described. In the present study, we studied permeability changes as a Function of Time.
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Plasma proteins in a standardised skin mini-erosion (I): permeability changes as a Function of Time
BMC Dermatology, 2002Co-Authors: Christer Svedman, Terence J. Ryan, Bing B Yu, Henry SvenssonAbstract:Background A standardised technique using a suction-induced mini-erosion that allows serial sampling of dermal interstitial fluid (IF) for 5 to 6 days has been described. In the present study, we studied permeability changes as a Function of Time. Methods We examined IF concentrations of total protein concentration and the concentration of insulin (6.6 kDa), prealbumin (55 kDa), albumin (66 kDa), transferrin (80 kDa), IgG (150 kDa) and alpha-2-macroglobulin (720 kDa) as a Function of Time, using an extraction pressure of 200 mmHg below atmospheric. Results At 0 h after forming the erosion, mean total IF protein content (relative to plasma) was 26 ± 13% (SD). For the individual proteins, the relative mean concentrations were 65 ± 36% for insulin, 48 ± 12% for albumin, 30 ± 19% for transferrin, 31 ± 15%for IgG and 19.5 ± 10% for alpha-2-macroglobulin. At 24 h, the total IF protein content was higher than at 0 h (56 ± 26% vs 26 ± 13%; p < 0.05, diff: 115%), as were some of the individual protein concentrations: prealbumin (50 ± 24 vs 25 ± 13%; p < 0.05), albumin (68 ± 21 vs 48 ± 12%; p < 0.05) and IgG (55 ± 30 vs 31 ± 15%; p = 0.05). ln the interval 24 h to 96 h the concentrations were relatively unchanged. Conclusions The results indicate that fluid sampled at 0 h after forming the erosion represents dermal IF before the full onset of inflammation. From 24 h onward, the sampled fluid reflects a steady state of increased permeability induced by inflammation. This technique is promising as a tool for clinically sampling substances that are freely distributed in the body and as a model for studying inflammation and vascular permeability.
Terence J. Ryan - One of the best experts on this subject based on the ideXlab platform.
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Plasma proteins in a standardised skin mini-erosion (I): permeability changes as a Function of Time.
BMC dermatology, 2002Co-Authors: Christer Svedman, Terence J. Ryan, Henry SvenssonAbstract:Background A standardised technique using a suction-induced mini-erosion that allows serial sampling of dermal interstitial fluid (IF) for 5 to 6 days has been described. In the present study, we studied permeability changes as a Function of Time.
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Plasma proteins in a standardised skin mini-erosion (I): permeability changes as a Function of Time
BMC Dermatology, 2002Co-Authors: Christer Svedman, Terence J. Ryan, Bing B Yu, Henry SvenssonAbstract:Background A standardised technique using a suction-induced mini-erosion that allows serial sampling of dermal interstitial fluid (IF) for 5 to 6 days has been described. In the present study, we studied permeability changes as a Function of Time. Methods We examined IF concentrations of total protein concentration and the concentration of insulin (6.6 kDa), prealbumin (55 kDa), albumin (66 kDa), transferrin (80 kDa), IgG (150 kDa) and alpha-2-macroglobulin (720 kDa) as a Function of Time, using an extraction pressure of 200 mmHg below atmospheric. Results At 0 h after forming the erosion, mean total IF protein content (relative to plasma) was 26 ± 13% (SD). For the individual proteins, the relative mean concentrations were 65 ± 36% for insulin, 48 ± 12% for albumin, 30 ± 19% for transferrin, 31 ± 15%for IgG and 19.5 ± 10% for alpha-2-macroglobulin. At 24 h, the total IF protein content was higher than at 0 h (56 ± 26% vs 26 ± 13%; p < 0.05, diff: 115%), as were some of the individual protein concentrations: prealbumin (50 ± 24 vs 25 ± 13%; p < 0.05), albumin (68 ± 21 vs 48 ± 12%; p < 0.05) and IgG (55 ± 30 vs 31 ± 15%; p = 0.05). ln the interval 24 h to 96 h the concentrations were relatively unchanged. Conclusions The results indicate that fluid sampled at 0 h after forming the erosion represents dermal IF before the full onset of inflammation. From 24 h onward, the sampled fluid reflects a steady state of increased permeability induced by inflammation. This technique is promising as a tool for clinically sampling substances that are freely distributed in the body and as a model for studying inflammation and vascular permeability.
Burtron H. Davis - One of the best experts on this subject based on the ideXlab platform.
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Fischer–Tropsch Synthesis: XANES Spectra of Potassium in Promoted Precipitated Iron Catalysts as a Function of Time On-stream
Catalysis Letters, 2017Co-Authors: Gary Jacobs, Venkat Ramana Rao Pendyala, Michela Martinelli, Wilson D. Shafer, Muthu Kumaran Gnanamani, Syed Khalid, Aimee Maclennan, Yongfeng Hu, Burtron H. DavisAbstract:XANES K-edge spectra of potassium promoter in precipitated Fe catalysts were acquired following activation by carburization in CO and as a Function of Time on-stream during the course of a Fischer–Tropsch synthesis run for a 100Fe:2K catalyst by withdrawing catalysts, sealed in wax product, for analysis. CO-activated and end-of-run spectra of the catalyst were also obtained for a 100Fe:5K catalyst. Peaks representing electronic transitions and multiple scattering were observed and resembled reference spectra for potassium carbonate or potassium formate. The shift in the multiple scattering peak to higher energy was consistent with sintering of potassium promoter during the course of the reaction test. The catalyst, however, retained its carbidic state, as demonstrated by XANES and EXAFS spectra at the iron K-edge, suggesting that sintering of potassium did not adversely affect the carburization rate, which is important for preventing iron carbides from oxidizing. The method serves a starting point for developing better understanding of the chemical state and changes in structure occurring with alkali promoter. Graphical Abstract
Juostas Antanas - One of the best experts on this subject based on the ideXlab platform.
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Estimation of farm tractor performance as a Function of Time efficiency during ploughing in fields of different sizes
2020Co-Authors: Janulevičius Algirdas, Čiplienė Aušra, Šarauskis Egidijus, Juostas AntanasAbstract:Tractors have to perform various agricultural tasks in fields of different sizes. While working, tractors consume large amounts of fuel and contribute considerably to pollution of the environment. This study provides a method for the estimation and comparison of tractor performance when ploughing is carried out in fields of different lengths. Tractor performance as a Function of Time efficiency is estimated during tests with a 160 kW Massey Ferguson MF6499 tractor performing soil ploughing operations. For characterisa- tion of different field sizes, a Time efficiency factor was introduced, which was expressed as the ratio between the duration of ploughing operation and the duration of the whole ploughing process including the non-working Time. Ploughing of fields with lengths of 200, 300, 500, 750, and 1000 m resulted in Time efficiency values of 0.56, 0.67, 0.78, 0.84, and 0.88, respectively. This study analysed the tractor productivity, power utilisation efficiency, fuel consumption, and CO 2 and CO emissions for five fields. These indicators were calculated using the tractor engine Electronic Control Unit (ECU) ‘Load Profile ’ database. Regression analyses demonstrated that the tractor performance indicators perfectly correlate with the Time efficiency factor according to either a linear or exponential equation model. It should be noted that the suggested method allows for better estimation and comparison of tractor performance indicators when ploughing is performed in fields with different width-tolength ratiosProj. Nr. CPB-20-1 (K. Venslauskas)Vytauto Didžiojo universitetasŽemės ūkio akademijaŽemės ūkio inžinerijos fakulteta
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Estimation of farm tractor performance as a Function of Time efficiency during ploughing in fields of different sizes
'Elsevier BV', 2020Co-Authors: Janulevičius Algirdas, Čiplienė Aušra, Šarauskis Egidijus, Juostas AntanasAbstract:Tractors have to perform various agricultural tasks in fields of different sizes. While working, tractors consume large amounts of fuel and contribute considerably to pollution of the environment. This study provides a method for the estimation and comparison of tractor performance when ploughing is carried out in fields of different lengths. Tractor performance as a Function of Time efficiency is estimated during tests with a 160 kW Massey Ferguson MF6499 tractor performing soil ploughing operations. For characterisa- tion of different field sizes, a Time efficiency factor was introduced, which was expressed as the ratio between the duration of ploughing operation and the duration of the whole ploughing process including the non-working Time. Ploughing of fields with lengths of 200, 300, 500, 750, and 1000 m resulted in Time efficiency values of 0.56, 0.67, 0.78, 0.84, and 0.88, respectively. This study analysed the tractor productivity, power utilisation efficiency, fuel consumption, and CO 2 and CO emissions for five fields. These indicators were calculated using the tractor engine Electronic Control Unit (ECU) ‘Load Profile ’ database. Regression analyses demonstrated that the tractor performance indicators perfectly correlate with the Time efficiency factor according to either a linear or exponential equation model. It should be noted that the suggested method allows for better estimation and comparison of tractor performance indicators when ploughing is performed in fields with different width-tolength ratiosVytauto Didžiojo universitetasŽemės ūkio inžinerijos fakulteta
