WATER AIR AND SOIL POLLUTION
·
2016
·Vol. 227
·期 9
·1-11
·
IF 1.551
Wu Hailu,Xu Kaiqin,He Xiaojuan,Wang Xinze
Three macrophyte species, Typha augustifolia ( T. augustifolia ), Phragmites australis ( P. australis ), and Acorus calamus L. ( A. calamus L.), have been grown in hydroponic cultivation systems fed with synthetic wastewater. The experiment was designed as 3 × 2 factorial, with three species and two ratios of NH 4
+ /NO 3
− so as to investigate the nitrogen transformation and nitrogen removal capacity of each species. The nitrogen removal mechanism was further disclosed by comparing biomass production, nitrogen mass balance, and root exudates of the three plant species under different NH 4
+ /NO 3
− ratios. The results indicated there exists a linear relationship, with positive significance ( r = 0.946, p < 0.05), between plant biomass and total nitrogen (TN) removal efficiency; in other words, biomass could best reflect plant ability to remove nitrogen. It is also found that NH 4
+ /NO 3
− ratio could influence plant biomass and root exudates significantly. Additionally, the hydrogen donor and source of energy in denitrification happened in this research were mainly organic acids and soluble sugars, accounting for approximately 50 % of the composition in root exudates.
研究领域:
环境科学
·
植物生理学
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2024
·
IF 9
Qiuli Xia,Lin Zhang,Peng Zhan,Zhaohui Tong,Yan Qing,Jiaying He,Zhiping Wu,Hui Wang,Lishu Shao,Na Liu
The cost-effective and low-carbon fractionation of lignocellulosic biomass will enhance the economic viability of bio-refining. To achieve efficient reed fractionation under favorable conditions, microwave-assisted choline chloride and p -toluene sulfonic acid (M-ChCl/ p -TsOH) pretreatment was employed. The fractionation of reed components demonstrated higher effectiveness with M-ChCl/ p -TsOH pretreatment compared to conventional DES pretreatment. Under M-ChCl/ p -TsOH conditions, a high hemicellulose removal rate (∼90%) and delignification rate (∼65%) were achieved while achieving a saccharification rate of 88% during cellulase hydrolysis. Microwave assistance not only significantly reduced reaction time to less than 60 s but also enhanced the pretreatment efficacy. Furthermore, the obtained lignin products consisted of low-polymerization lignin (M W < 800 g/mol) and acid-soluble lignin, providing a solid foundation for subsequent high-value utilization of lignin. This study provides a promising strategy for the low carbon fractionation of reed using DES, aiming to simultaneously achieve efficient cellulose hydrolysis and obtain tractable lignin.
研究领域:
生物化学
·
可再生资源技术
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Bin Wang,Hang Xu,Yu Liu,Kaiping Zhou,Xinyu Li,Deyang Kong,Jinmei Chen,Yujie He,Rong Ji
Phytoremediation is an effective solution to treat pollution with antibiotic compounds in aquatic environments; however, the underlying mechanisms for plants to cope with antibiotic pollutants are obscure. Here we used cell suspension culture to investigate the distribution and transformation of ciprofloxacin (CIP) in common reed ( Phragmites australis ) plants, as well as the accompanying phenotypic and metabolic responses of plants. By means of radioactive isotope labelling, we found that in total 68 % of CIP was transformed via intracellular Phase I transformation (reduction and methylation), Phase Ⅱ conjugation (glycosylation), and Phase Ⅲ compartmentalization (cell-bound residue formation mainly in cell walls, 23 %). The reduction and glycosylation products were secreted by the cells. To mitigate stress induced by CIP and its transformation products, the cells activated the defense system by up-regulating both intra- and extra-cellular antioxidant metabolites ( e.g. , catechin, l -cystine, and dehydroascorbic acid), anti-C/N metabolism disorder metabolites ( e.g. , succinic acid), secreting signaling ( e.g. , nicotinic acid), and anti-stress ( e.g. , allantoin) metabolites. Notably, the metabolic reprogramming could be involved in the CIP transformation process ( e.g. , glycosylation). Our findings reveal the strategy of wetland plants to cope with the stress from CIP by transforming the xenobiotic compound and reprogramming metabolism, and provide novel insights into the fate of antibiotics and plant defense mechanisms during phytoremediation.
研究领域:
环境科学
·
植物生理学
·
药理学
·
毒理学
·
代谢组学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jiajun Wen,Zhongwu Li,Changsheng Jin,Jia Chen,Changqing Cai
Dissolved organic matter (DOM) or iron/manganese (hydro)oxides were important factors in the migration of Cd in sediments of wetlands. DOM and Fe oxides simultaneously affect the longitudinal and transverse migration of Cd in wetlands sediments of plants was still unclear. In this study, a 14-day rhizobox experiment was conducted and the result showed that the rhizosphere effect of Cd migration was only limited to the upper layer of sediments (− 2 to − 4 cm). Fe with fulvic acid (FA) simultaneously existed can precipitate Cd(II) from supernatant to sediments downward. Fe oxides at sediment concentration could effectively prevent Cd(II) from migrating to root surface (0.21 vs 0.02 at%). While Fe oxides with FA together at sediment concentration could effectively promoted the migration of Cd(II) to root surface (0.07 vs 0.08 at%). The formation of organo-metallic complexes of Fe in the presence of FA profoundly proved this finding (increased by ~33.0%). And the polysaccharides and aromatics in organic matter were the chief functional groups participating in the incorporation of Cd and Fe oxides. The findings reveal the migration rules of Cd(II) in sediments by FA and Fe oxides and give an insight into the mechanisms of Cd(II) migration to the root surface around wetland plants.
研究领域:
环境科学
·
植物学
✓ 已验证
DOI
PubMed
高影响因子
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