The Experts below are selected from a list of 5736 Experts worldwide ranked by ideXlab platform
Yanjun Xu - One of the best experts on this subject based on the ideXlab platform.
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preparation and properties of recycled hdpe natural fiber composites
Composites Part A-applied Science and Manufacturing, 2007Co-Authors: Yong Lei, Fei Yao, Qinglin Wu, Yanjun XuAbstract:Composites based on recycled high density polyethylene (RHDPE) and natural fibers were made through melt blending and compression molding. The effects of the fibers (wood and bagasse) and coupling agent type/concentration on the composite properties were studied. The use of maleated polyethylene (MAPE), carboxylated polyethylene (CAPE), and titanium-derived mixture (TDM) improved the compatibility between the bagasse fiber and RHDPE, and mechanical properties of the resultant composites compared well with those of virgin HDPE composites. The modulus and impact strength of the composites had maxima with MAPE content increase. The composites had lower crystallization peak temperatures and wider crystalline temperature range than neat RHDPE, and their thermal stability was lower than RHDPE.
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Preparation and properties of recycled HDPE/natural fiber composites
Composites Part A: Applied Science and Manufacturing, 2007Co-Authors: Yong Lei, Fei Yao, Qinglin Wu, Yanjun XuAbstract:Composites based on recycled high density polyethylene (RHDPE) and natural fibers were made through melt blending and compression molding. The effects of the fibers (wood and bagasse) and coupling agent type/concentration on the composite properties were studied. The use of maleated polyethylene (MAPE), carboxylated polyethylene (CAPE), and titanium-derived mixture (TDM) improved the compatibility between the bagasse fiber and RHDPE, and mechanical properties of the resultant composites compared well with those of virgin HDPE composites. The modulus and impact strength of the composites had maxima with MAPE content increase. The composites had lower crystallization peak temperatures and wider crystalline temperature range than neat RHDPE, and their thermal stability was lower than RHDPE. © 2007 Elsevier Ltd. All rights reserved.
Yong Lei - One of the best experts on this subject based on the ideXlab platform.
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preparation and properties of recycled hdpe natural fiber composites
Composites Part A-applied Science and Manufacturing, 2007Co-Authors: Yong Lei, Fei Yao, Qinglin Wu, Yanjun XuAbstract:Composites based on recycled high density polyethylene (RHDPE) and natural fibers were made through melt blending and compression molding. The effects of the fibers (wood and bagasse) and coupling agent type/concentration on the composite properties were studied. The use of maleated polyethylene (MAPE), carboxylated polyethylene (CAPE), and titanium-derived mixture (TDM) improved the compatibility between the bagasse fiber and RHDPE, and mechanical properties of the resultant composites compared well with those of virgin HDPE composites. The modulus and impact strength of the composites had maxima with MAPE content increase. The composites had lower crystallization peak temperatures and wider crystalline temperature range than neat RHDPE, and their thermal stability was lower than RHDPE.
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Preparation and properties of recycled HDPE/natural fiber composites
Composites Part A: Applied Science and Manufacturing, 2007Co-Authors: Yong Lei, Fei Yao, Qinglin Wu, Yanjun XuAbstract:Composites based on recycled high density polyethylene (RHDPE) and natural fibers were made through melt blending and compression molding. The effects of the fibers (wood and bagasse) and coupling agent type/concentration on the composite properties were studied. The use of maleated polyethylene (MAPE), carboxylated polyethylene (CAPE), and titanium-derived mixture (TDM) improved the compatibility between the bagasse fiber and RHDPE, and mechanical properties of the resultant composites compared well with those of virgin HDPE composites. The modulus and impact strength of the composites had maxima with MAPE content increase. The composites had lower crystallization peak temperatures and wider crystalline temperature range than neat RHDPE, and their thermal stability was lower than RHDPE. © 2007 Elsevier Ltd. All rights reserved.
Qinglin Wu - One of the best experts on this subject based on the ideXlab platform.
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preparation and properties of recycled hdpe natural fiber composites
Composites Part A-applied Science and Manufacturing, 2007Co-Authors: Yong Lei, Fei Yao, Qinglin Wu, Yanjun XuAbstract:Composites based on recycled high density polyethylene (RHDPE) and natural fibers were made through melt blending and compression molding. The effects of the fibers (wood and bagasse) and coupling agent type/concentration on the composite properties were studied. The use of maleated polyethylene (MAPE), carboxylated polyethylene (CAPE), and titanium-derived mixture (TDM) improved the compatibility between the bagasse fiber and RHDPE, and mechanical properties of the resultant composites compared well with those of virgin HDPE composites. The modulus and impact strength of the composites had maxima with MAPE content increase. The composites had lower crystallization peak temperatures and wider crystalline temperature range than neat RHDPE, and their thermal stability was lower than RHDPE.
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Preparation and properties of recycled HDPE/natural fiber composites
Composites Part A: Applied Science and Manufacturing, 2007Co-Authors: Yong Lei, Fei Yao, Qinglin Wu, Yanjun XuAbstract:Composites based on recycled high density polyethylene (RHDPE) and natural fibers were made through melt blending and compression molding. The effects of the fibers (wood and bagasse) and coupling agent type/concentration on the composite properties were studied. The use of maleated polyethylene (MAPE), carboxylated polyethylene (CAPE), and titanium-derived mixture (TDM) improved the compatibility between the bagasse fiber and RHDPE, and mechanical properties of the resultant composites compared well with those of virgin HDPE composites. The modulus and impact strength of the composites had maxima with MAPE content increase. The composites had lower crystallization peak temperatures and wider crystalline temperature range than neat RHDPE, and their thermal stability was lower than RHDPE. © 2007 Elsevier Ltd. All rights reserved.
Fei Yao - One of the best experts on this subject based on the ideXlab platform.
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preparation and properties of recycled hdpe natural fiber composites
Composites Part A-applied Science and Manufacturing, 2007Co-Authors: Yong Lei, Fei Yao, Qinglin Wu, Yanjun XuAbstract:Composites based on recycled high density polyethylene (RHDPE) and natural fibers were made through melt blending and compression molding. The effects of the fibers (wood and bagasse) and coupling agent type/concentration on the composite properties were studied. The use of maleated polyethylene (MAPE), carboxylated polyethylene (CAPE), and titanium-derived mixture (TDM) improved the compatibility between the bagasse fiber and RHDPE, and mechanical properties of the resultant composites compared well with those of virgin HDPE composites. The modulus and impact strength of the composites had maxima with MAPE content increase. The composites had lower crystallization peak temperatures and wider crystalline temperature range than neat RHDPE, and their thermal stability was lower than RHDPE.
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Preparation and properties of recycled HDPE/natural fiber composites
Composites Part A: Applied Science and Manufacturing, 2007Co-Authors: Yong Lei, Fei Yao, Qinglin Wu, Yanjun XuAbstract:Composites based on recycled high density polyethylene (RHDPE) and natural fibers were made through melt blending and compression molding. The effects of the fibers (wood and bagasse) and coupling agent type/concentration on the composite properties were studied. The use of maleated polyethylene (MAPE), carboxylated polyethylene (CAPE), and titanium-derived mixture (TDM) improved the compatibility between the bagasse fiber and RHDPE, and mechanical properties of the resultant composites compared well with those of virgin HDPE composites. The modulus and impact strength of the composites had maxima with MAPE content increase. The composites had lower crystallization peak temperatures and wider crystalline temperature range than neat RHDPE, and their thermal stability was lower than RHDPE. © 2007 Elsevier Ltd. All rights reserved.
Sean S Davies - One of the best experts on this subject based on the ideXlab platform.
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leptogenic effects of Nape require activity of Nape hydrolyzing phospholipase d
Journal of Lipid Research, 2017Co-Authors: Zhongyi Chen, Yongqin Zhang, Noura S Dosoky, Lorenzo De Ferra, Scott Peters, Kevin D Niswender, Sean S DaviesAbstract:Food intake induces synthesis of N-acylphosphatidylethanolamines (Napes) in the intestinal tract. While Napes exert leptin-like (leptogenic) effects, including reduced weight gain and food intake, the mechanisms by which Napes induce these leptogenic effects remain unclear. One key question is whether intestinal Napes act directly on cognate receptors or first require conversion to N-acylethanolamides (NAEs) by Nape-hydrolyzing phospholipase D (Nape-PLD). Previous studies using Nape-pld−/− mice were equivocal because intraperitoneal injection of Napes led to nonspecific aversive effects. To avoid the aversive effects of injection, we delivered Napes and NAEs intestinally using gut bacteria synthesizing these compounds. Unlike in wild-type mice, increasing intestinal levels of Nape using Nape-synthesizing bacteria in Nape-pld−/− mice failed to reduce food intake and weight gain or alter gene expression. In contrast, increasing intestinal NAE levels in Nape-pld−/− mice using NAE-synthesizing bacteria induced all of these effects. These NAE-synthesizing bacteria also markedly increased NAE levels and decreased inflammatory gene expression in omental adipose tissue. These results demonstrate that intestinal Napes require conversion to NAEs by the action of Nape-PLD to exert their various leptogenic effects, so that the reduced intestinal Nape-PLD activity found in obese subjects may directly contribute to excess food intake and obesity.
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isolevuglandin modified phosphatidylethanolamine is metabolized by Nape hydrolyzing phospholipase d
Journal of Lipid Research, 2013Co-Authors: Stephen Gragg, Zhongyi Chen, Yongqin Zhang, Venkataraman Amarnath, Sean S DaviesAbstract:Oxidative stress has been implicated in atherosclerosis, diabetes, neurodegenerative diseases, and various cancers. Peroxidation of lipids generates a number of highly reactive aldehydes including isolevuglandins (IsoLGs) (1, 2). IsoLGs induce a variety of cellular responses related to the pathophysiology of human diseases, including increased macrophage uptake of LDL, activation of platelet aggregation, inhibition of sodium and potassium channels, inhibition of proteasome function, induction of proinflammatory genes, and cytotoxicity (3–6). Recent studies show that the proinflammatory and cytotoxic effects of lipid aldehydes such as IsoLGs are mediated in part by their modification of the headgroups of phosphatidylethanolamines (PEs) (7–9). Isolevuglandin-modified phosphatidylethanolamine (IsoLG-PE) levels increase during a number of pathological conditions (10–12), suggesting that cellular systems that normally degrade IsoLG-PE may become dysfunctional during these conditions. We therefore sought to characterize the processes by which cells normally degrade IsoLG-PE. N-acyl phosphatidylethanolamine hydrolyzing phospholipase D (Nape-PLD) catalyzes the hydrolysis of N-acyl phosphatidylethanolamines (Napes) to N-acyl ethanolamines (NAEs) such as anandamide (13). Although both Nape-PLD and cannonical phospholipase Ds (PLDs) (PLD1 and PLD2) hydrolyze the headgroups at the phosphodiester bond of phospholipids, these two classes of PLDs do not share structural or enzymatic homology. Unlike the canonical PLDs, Nape-PLD does not transphosphatidylate phospholipids, nor does it hydrolyze phosphatidylcholine (PC) or unmodified PE (14–16). Instead, Nape-PLD hydrolyzes Nape with N-acyl chains of 4 to 20 carbons, with C12:0Nape having the highest hydrolysis rate (15). While Nape-PLD−/− mice have significantly increased levels of Nape and reduced levels of NAEs such as oleoylethanolamide and palmitoylethanolamide compared with wild-type mice, anandamide levels are not changed in Nape-PLD−/− mice (17), raising the possibility that the main physiological role of Nape-PLD may be something other than endocannabinoid synthesis. Because both Nape and IsoLG-PE have large aliphatic headgroups, we considered the possibility that Nape-PLD is a critical catabolic enzyme for the catabolism of IsoLG-PE and other aldehyde-modified PEs (al-PEs). Our studies demonstrate that Nape-PLD does indeed hydrolyze IsoLG-PE.
