Laser-induced breakdown spectroscopy （LIBS） was used to decipher the unique multi-elemental characteristics of Juncus effusus L. The spectral fingerprints of Juncus effusus L. were established based on elemental mic...Laser-induced breakdown spectroscopy （LIBS） was used to decipher the unique multi-elemental characteristics of Juncus effusus L. The spectral fingerprints of Juncus effusus L. were established based on elemental microanalysis via LIBS. Microanalysis and multimode sampling methodologies were designed in this study. The relative standard deviation （RSD） approach was performed to optimize the multi-shot measurements. Taking advantage of the capability with no or minimal sample pre-treatment of LIBS, a thermodynamic chart of four elements （Mg, Ca, Ba, and Na） was created from twelve collection regions. The diagram of elemental distribution on a micro-scale was generated to explore the nature of Juncus effusus L. by LIBS. The results demon- strated that LIBS is a promising technique for rapid elemental microanalysis of heterogeneous samples.展开更多
Semiconductor heterojunction engineering and three-dimensional(3D)architecture con-struction have been considered highly desirable strategies to enhance photocatalytic perfor-mance.Herein,a BiOI/ZnO composite photocat...Semiconductor heterojunction engineering and three-dimensional(3D)architecture con-struction have been considered highly desirable strategies to enhance photocatalytic perfor-mance.Herein,a BiOI/ZnO composite photocatalyst with a 3D flower-like architecture was successfully prepared,whichwas stably immobilized on three-dimensional porous lignocel-lulosic biomass Juncus effusus(JE)fiber.The outstanding photocatalytic performance of the BiOI/ZnO-JE fiber was confirmed by the degradation of tetracycline hydrochloride(TC,90%),ciprofloxacin(CIP,79%),and norfloxacin(NOR,81%).The enhanced photocatalytic activities were mainly attributed to the synergistic absorption performance of the lignocellulosic JE and the effective transfer and separation of charges.Moreover,the hydroxyl(·OH)and super-oxide radicals(·O_(2)^(−))are themain reactive species in the photocatalytic process according to the analysis.This work may provide a novel perspective for constructing high-performance lignocellulosic-based photocatalytic materials.展开更多
[Objective] The aim was to explore the effects of seven kinds of Chinese herbal medicine on Escherichia coil and Staphylococcus aureus in terms of unilater- al bacteriostatic effect, such as root and leaf of Ophiopogo...[Objective] The aim was to explore the effects of seven kinds of Chinese herbal medicine on Escherichia coil and Staphylococcus aureus in terms of unilater- al bacteriostatic effect, such as root and leaf of Ophiopogon japonicus, honeycomb, Panax pseudoginseng, and Allium macrostemon. [Method] Herbal active ingredients were extracted by water boiling method and a bacteriostatic experiment was per- formed by oxford cup diffusion method, to select Chinese herbs with antibacterial effects. MIC values of seven kinds of Chinese herbal medicine were determined by in vitro half-fold dilution method. [Results] Root and leaf of Ophiopogon japonicus, honeycomb, Panax pseudoginseng, Allium macrostemon, Juncus effusus and Xanthi- um sibiricum had bacteriostatic effects on Escherichia coil and Staphylococcus au- reus in varying degrees. Xanthium and leaf of Ophiopogon japonicus performed bet- ter on Escherichia coil, with MIC values at 7.81 and 15.63 mg/ml, respectively. Panax pseudoginseng and Xanthium performed better on Staphylococcus aureus with MIC values at 15.63 and 31.25 mg/ml. And the drug＇s effect was positively correlated with the concentration. [Conclusion] Xanthium sibiricum is the best bacte- riostatic effect, followed by leaf of Ophiopogon japonicus, and Juncus effusus per- forms the poorest. Panax pseudoginseng showed the best bacteriostatic effect, fol- lowed by Xanthium sibiricum and Juncus effusus performs the poorest. These pro- vide references for clinic safety.展开更多
The effects of photoperiod and light intensity on flowering in Mat Rush cv. Gangshan 3 were studied. The results showed that treatments with longer day length stimulated flowering significantly and increased stem flow...The effects of photoperiod and light intensity on flowering in Mat Rush cv. Gangshan 3 were studied. The results showed that treatments with longer day length stimulated flowering significantly and increased stem flowering percentage (SFP). Plants treated with low light intensity at early stage had substantially reduced florets per cyme, SFP, tillers per plant and stem length. At middle and late stage, low light intensity significantly reduced SFP. The principal climatic factors affecting SFP were as follows: mean temperatures (MT) of the third ten day period (TDP) in December and of the second TDP in February, actual sunlight hours (SH) of the third TDP in February and precipitation of the third TDP in March. A nonlinear simulation model for SFP was established with experimental results and corresponding climatic data (see Eq.(2)). Simulation by the above equation yielded values the same as those observed from 1992 to 2000, indicating its accuracy in describing the relationship between flowering and light and temperature conditions. The interaction between vernalization and SH is also discussed in this paper.展开更多
Aims Gunnera tinctoria is an unusual N-fixing plant species that has become invasive worldwide,generally in environments with a low evaporative demand and/or high rainfall.Amongst the many mechanisms that may explain ...Aims Gunnera tinctoria is an unusual N-fixing plant species that has become invasive worldwide,generally in environments with a low evaporative demand and/or high rainfall.Amongst the many mechanisms that may explain its success as an introduced species,a contrasting phenology could be important but this may depend on an ability to grow and utilize nutrients under sub-optimal conditions.We examined whether G.tinctoria has an advantage in terms of a contrasting phenology and N-fixing capability,in comparisons with Juncus effusus,the native species most impacted by G.tinctoria invasions.Methods We made phenological assessments on a weekly or bi-weekly basis on long-established populations on Achill Island,Ireland,during 2016-2017.Data on leaf and inflorescence number,total leaf area,light interception and above-ground biomass were collected alongside measurements of soil temperature,moisture and oxidation-reduction potential.The significance of N-fixing ability for supporting seasonal growth was assessed usingδ15N isotopic assessments,together with in situ acetylene reduction measurements.Important Findings The timing of the initiation of growth of G.tinctoria and J.effusus varied between 2016 and 2017,with the earlier emergence and expansion of leaves of G.tinctoria,and the largest above-ground biomass associated with higher water availability.The early growth of G.tinctoria was dependent on preformed structures,with maximum canopy development occurring in late May,prior to that of J.effusus.Whilst N-fixation was observed in March,this made a more significant contribution to growth during the later stages of canopy development.Based onδ15N isotopic analyses,early growth was predominantly associated with N-remobilization from the rhizomes,whilst seedlings were largely reliant on N-fixation.This emphasizes the importance of nutrient mobilization for early growth and shows that the importance of an N-fixing capability may vary developmentally,as well as during different stages of the invasion process.展开更多
基金supported by National Natural Science Foundation of China(No.81303218)Beijing Municipal Government for the University Affiliated with the Party Central CommitteeDoctoral Fund of Ministry of Education of China(No.20130013120006)
文摘Laser-induced breakdown spectroscopy （LIBS） was used to decipher the unique multi-elemental characteristics of Juncus effusus L. The spectral fingerprints of Juncus effusus L. were established based on elemental microanalysis via LIBS. Microanalysis and multimode sampling methodologies were designed in this study. The relative standard deviation （RSD） approach was performed to optimize the multi-shot measurements. Taking advantage of the capability with no or minimal sample pre-treatment of LIBS, a thermodynamic chart of four elements （Mg, Ca, Ba, and Na） was created from twelve collection regions. The diagram of elemental distribution on a micro-scale was generated to explore the nature of Juncus effusus L. by LIBS. The results demon- strated that LIBS is a promising technique for rapid elemental microanalysis of heterogeneous samples.
基金supported by the Foundation of Science Re-search Program from the Hubei Provincial Department of Ed-ucation(No.Q20221711)the Program ofWuhan Research Center of Ecodyeing&Finishing and Functional Textile(No.EDFT2021002).
文摘Semiconductor heterojunction engineering and three-dimensional(3D)architecture con-struction have been considered highly desirable strategies to enhance photocatalytic perfor-mance.Herein,a BiOI/ZnO composite photocatalyst with a 3D flower-like architecture was successfully prepared,whichwas stably immobilized on three-dimensional porous lignocel-lulosic biomass Juncus effusus(JE)fiber.The outstanding photocatalytic performance of the BiOI/ZnO-JE fiber was confirmed by the degradation of tetracycline hydrochloride(TC,90%),ciprofloxacin(CIP,79%),and norfloxacin(NOR,81%).The enhanced photocatalytic activities were mainly attributed to the synergistic absorption performance of the lignocellulosic JE and the effective transfer and separation of charges.Moreover,the hydroxyl(·OH)and super-oxide radicals(·O_(2)^(−))are themain reactive species in the photocatalytic process according to the analysis.This work may provide a novel perspective for constructing high-performance lignocellulosic-based photocatalytic materials.
文摘[Objective] The aim was to explore the effects of seven kinds of Chinese herbal medicine on Escherichia coil and Staphylococcus aureus in terms of unilater- al bacteriostatic effect, such as root and leaf of Ophiopogon japonicus, honeycomb, Panax pseudoginseng, and Allium macrostemon. [Method] Herbal active ingredients were extracted by water boiling method and a bacteriostatic experiment was per- formed by oxford cup diffusion method, to select Chinese herbs with antibacterial effects. MIC values of seven kinds of Chinese herbal medicine were determined by in vitro half-fold dilution method. [Results] Root and leaf of Ophiopogon japonicus, honeycomb, Panax pseudoginseng, Allium macrostemon, Juncus effusus and Xanthi- um sibiricum had bacteriostatic effects on Escherichia coil and Staphylococcus au- reus in varying degrees. Xanthium and leaf of Ophiopogon japonicus performed bet- ter on Escherichia coil, with MIC values at 7.81 and 15.63 mg/ml, respectively. Panax pseudoginseng and Xanthium performed better on Staphylococcus aureus with MIC values at 15.63 and 31.25 mg/ml. And the drug＇s effect was positively correlated with the concentration. [Conclusion] Xanthium sibiricum is the best bacte- riostatic effect, followed by leaf of Ophiopogon japonicus, and Juncus effusus per- forms the poorest. Panax pseudoginseng showed the best bacteriostatic effect, fol- lowed by Xanthium sibiricum and Juncus effusus performs the poorest. These pro- vide references for clinic safety.
文摘The effects of photoperiod and light intensity on flowering in Mat Rush cv. Gangshan 3 were studied. The results showed that treatments with longer day length stimulated flowering significantly and increased stem flowering percentage (SFP). Plants treated with low light intensity at early stage had substantially reduced florets per cyme, SFP, tillers per plant and stem length. At middle and late stage, low light intensity significantly reduced SFP. The principal climatic factors affecting SFP were as follows: mean temperatures (MT) of the third ten day period (TDP) in December and of the second TDP in February, actual sunlight hours (SH) of the third TDP in February and precipitation of the third TDP in March. A nonlinear simulation model for SFP was established with experimental results and corresponding climatic data (see Eq.(2)). Simulation by the above equation yielded values the same as those observed from 1992 to 2000, indicating its accuracy in describing the relationship between flowering and light and temperature conditions. The interaction between vernalization and SH is also discussed in this paper.
基金supported by the Brazilian National Council for Scientific and Technological Development(CNPq).M.C.M.received the grant number 205031/2014-5.A.B.G.and L.G.S.were supported by grants from the Spanish Ministerio de Economía y Competitividad(BES-2013-062945 and CTM2015-64728-C2-1-R,respectively).
文摘Aims Gunnera tinctoria is an unusual N-fixing plant species that has become invasive worldwide,generally in environments with a low evaporative demand and/or high rainfall.Amongst the many mechanisms that may explain its success as an introduced species,a contrasting phenology could be important but this may depend on an ability to grow and utilize nutrients under sub-optimal conditions.We examined whether G.tinctoria has an advantage in terms of a contrasting phenology and N-fixing capability,in comparisons with Juncus effusus,the native species most impacted by G.tinctoria invasions.Methods We made phenological assessments on a weekly or bi-weekly basis on long-established populations on Achill Island,Ireland,during 2016-2017.Data on leaf and inflorescence number,total leaf area,light interception and above-ground biomass were collected alongside measurements of soil temperature,moisture and oxidation-reduction potential.The significance of N-fixing ability for supporting seasonal growth was assessed usingδ15N isotopic assessments,together with in situ acetylene reduction measurements.Important Findings The timing of the initiation of growth of G.tinctoria and J.effusus varied between 2016 and 2017,with the earlier emergence and expansion of leaves of G.tinctoria,and the largest above-ground biomass associated with higher water availability.The early growth of G.tinctoria was dependent on preformed structures,with maximum canopy development occurring in late May,prior to that of J.effusus.Whilst N-fixation was observed in March,this made a more significant contribution to growth during the later stages of canopy development.Based onδ15N isotopic analyses,early growth was predominantly associated with N-remobilization from the rhizomes,whilst seedlings were largely reliant on N-fixation.This emphasizes the importance of nutrient mobilization for early growth and shows that the importance of an N-fixing capability may vary developmentally,as well as during different stages of the invasion process.
