Four different ratios of river sand,ceramic pellets,vermiculite and perlite(1:1),and field soil were selected as the substrates in this experiment,and four gradient levels of root waterlogging,half waterlogging,full w...Four different ratios of river sand,ceramic pellets,vermiculite and perlite(1:1),and field soil were selected as the substrates in this experiment,and four gradient levels of root waterlogging,half waterlogging,full waterlogging and normal were set to investigate the effects of different gradients of waterlogging stress on the root morphology of Taxus chinensis var.mairei seedlings under different substrates.In this study,the root anatomical structure of Taxus chinensis var.mairei under different waterlogging stress was observed by the paraffin section method.The roots of T.chinensis var.mairei were diarch,with no pith and resin canals.There was a large number of tannins in the pericycle of the aerial adventitious roots of seedlings adapted to waterlogging.Also,the endodermis has obvious casparian strip thickening,and there were 4-5 layers of large parenchymatous cells in the close to the inner side of the pericycle in the vascular cylinder,which could increase the storage capacity,and transport capacity of the root.Under the treatment of root waterlogging stress,the development of plant roots in the mixed substrate of vermiculite and,perlite was the earliest.Under half waterlogging stress,T.chinensis var.mairei seedlings treated with various substrates all could better adapt to the environment of waterlogging stress.Under the stress of fully waterlogging,the roots of seedlings planted in river sand substrate developed secondary growth.展开更多
To the Editor,Obesity,one of the most serious health concerns worldwide,exacerbates periodontitis pathogenesis and reduces the effectiveness of treatments1.Conversely,periodontitis-associated inflammation disrupts sys...To the Editor,Obesity,one of the most serious health concerns worldwide,exacerbates periodontitis pathogenesis and reduces the effectiveness of treatments1.Conversely,periodontitis-associated inflammation disrupts systemic lipid and glucose homeostasis,the major risk factors for developing obesity-associated pathologies1.Accumulated studies have demonstrated that certain supplemental dietary lipids such as dietary polyunsaturated fatty acids,have beneficial outcomes for diabetic and obese patients.In addition to dietary lipid supply,the oral and gut microbiota produce fatty acids(FAs)which provide the host with essential nutrients and aid in defense against pathogens.Hydroxyhexanoic medium chain FAs(MCFAs;6–12 carbons)are bacterial-derived lipids shown to have anti-inflammatory and insulin sensitization effects in diverse cell types such as hepatocytes2.However,whether and to what extent oral microbiota-produced MCFAs may ameliorate obesity-associated metabolic dysfunction are largely unknown.展开更多
The mechanochemical treatment of fly ash generated from a medical waste incinerator was subjected to grinding for 2 hr at 400 r/min in a planetary ball mill. The treated fly ash was characterized by a suite of analyti...The mechanochemical treatment of fly ash generated from a medical waste incinerator was subjected to grinding for 2 hr at 400 r/min in a planetary ball mill. The treated fly ash was characterized by a suite of analytical methods including High Resolution Gas Chromatograph/High Resolution Mass Spectrometer, Mastersizer 2000 Particle Size Analyzer, QUADRASORBTM SI Surface Area Analyzer, Scanning Electron Microscopy and X-ray diffraction. Results showed that abatement efficiency of polychlorinated dibenzo- p-dioxins and polychlorinated dibenzofurans （PCDDs/Fs） in terms of total concentration averagely amount to 76% which was relatively higher than that of I-TEQ concentration averagely amount to 56%; the most concentration of toxic congeners as well as isomers of PCDDs/Fs decreased after mechanochemical treatment. The treated fly ash was characterized by a more homogeneous distribution of concaves as well as the significant decreasing in overall particle size and great enlargement in surface area. The major crystallization phases or intensities were considerably changed by mechanochemical treatment, of which a new phase containing chlorine formed may be a possible factor suggesting chlorination reaction occurring on the crystalline surface.展开更多
基金This work was supported by the National Natural Science Foundation of China[Grant No.31270740].
文摘Four different ratios of river sand,ceramic pellets,vermiculite and perlite(1:1),and field soil were selected as the substrates in this experiment,and four gradient levels of root waterlogging,half waterlogging,full waterlogging and normal were set to investigate the effects of different gradients of waterlogging stress on the root morphology of Taxus chinensis var.mairei seedlings under different substrates.In this study,the root anatomical structure of Taxus chinensis var.mairei under different waterlogging stress was observed by the paraffin section method.The roots of T.chinensis var.mairei were diarch,with no pith and resin canals.There was a large number of tannins in the pericycle of the aerial adventitious roots of seedlings adapted to waterlogging.Also,the endodermis has obvious casparian strip thickening,and there were 4-5 layers of large parenchymatous cells in the close to the inner side of the pericycle in the vascular cylinder,which could increase the storage capacity,and transport capacity of the root.Under the treatment of root waterlogging stress,the development of plant roots in the mixed substrate of vermiculite and,perlite was the earliest.Under half waterlogging stress,T.chinensis var.mairei seedlings treated with various substrates all could better adapt to the environment of waterlogging stress.Under the stress of fully waterlogging,the roots of seedlings planted in river sand substrate developed secondary growth.
基金Ling Yang is supported by R01DK108835 and R01DK126817(USA),and Sara C.Sebag and Liu Hong are supported by R01DE026433(USA).
文摘To the Editor,Obesity,one of the most serious health concerns worldwide,exacerbates periodontitis pathogenesis and reduces the effectiveness of treatments1.Conversely,periodontitis-associated inflammation disrupts systemic lipid and glucose homeostasis,the major risk factors for developing obesity-associated pathologies1.Accumulated studies have demonstrated that certain supplemental dietary lipids such as dietary polyunsaturated fatty acids,have beneficial outcomes for diabetic and obese patients.In addition to dietary lipid supply,the oral and gut microbiota produce fatty acids(FAs)which provide the host with essential nutrients and aid in defense against pathogens.Hydroxyhexanoic medium chain FAs(MCFAs;6–12 carbons)are bacterial-derived lipids shown to have anti-inflammatory and insulin sensitization effects in diverse cell types such as hepatocytes2.However,whether and to what extent oral microbiota-produced MCFAs may ameliorate obesity-associated metabolic dysfunction are largely unknown.
基金supported by the Zhejiang Province Natural Science Foundation(No.X206955,Z506214)
文摘The mechanochemical treatment of fly ash generated from a medical waste incinerator was subjected to grinding for 2 hr at 400 r/min in a planetary ball mill. The treated fly ash was characterized by a suite of analytical methods including High Resolution Gas Chromatograph/High Resolution Mass Spectrometer, Mastersizer 2000 Particle Size Analyzer, QUADRASORBTM SI Surface Area Analyzer, Scanning Electron Microscopy and X-ray diffraction. Results showed that abatement efficiency of polychlorinated dibenzo- p-dioxins and polychlorinated dibenzofurans （PCDDs/Fs） in terms of total concentration averagely amount to 76% which was relatively higher than that of I-TEQ concentration averagely amount to 56%; the most concentration of toxic congeners as well as isomers of PCDDs/Fs decreased after mechanochemical treatment. The treated fly ash was characterized by a more homogeneous distribution of concaves as well as the significant decreasing in overall particle size and great enlargement in surface area. The major crystallization phases or intensities were considerably changed by mechanochemical treatment, of which a new phase containing chlorine formed may be a possible factor suggesting chlorination reaction occurring on the crystalline surface.
