Selenium is a trace element that can have both beneficial and harmful effects on aquatic life. The Aby Lagoon is a coastal environment in Côte d’Ivoire that receives selenium inputs from various natural and anth...Selenium is a trace element that can have both beneficial and harmful effects on aquatic life. The Aby Lagoon is a coastal environment in Côte d’Ivoire that receives selenium inputs from various natural and anthropogenic sources. The aim of this study was to assess the levels of selenium in the sediments of the Aby Lagoon and its tributaries, the Tanoe River and the Tendo Lagoon, and to examine the spatial and seasonal variations of selenium concentrations. Sediment samples were collected from different sites and seasons, and selenium concentrations were measured by atomic fluorescence spectrometry. The results showed that the average concentration of selenium in the sediments of the Aby Lagoon was 0.82 mg/kg, indicating moderate contamination. The concentration of selenium varied between sites and seasons, with higher values in the channel of the Tendo Lagoon and during the dry season. The study highlighted the complexity of selenium dynamics in aquatic ecosystems, and the need to take into account seasonal and spatial variability as well as interactions between environmental factors. The study also suggested potential ecotoxicological risks for some sensitive organisms in certain areas of the lagoon. This study contributes to the knowledge of the dynamics of selenium in lagoon ecosystems and to the assessment of the environmental risks associated with its presence.展开更多
The growth of Sakhalin fir(Abies sachalinen-sis)seedlings,an important forest tree species in northern Hokkaido,Japan,is significantly affected by competition from surrounding vegetation,especially evergreen dwarf bam...The growth of Sakhalin fir(Abies sachalinen-sis)seedlings,an important forest tree species in northern Hokkaido,Japan,is significantly affected by competition from surrounding vegetation,especially evergreen dwarf bamboo.In this study,we investigated the height and root collar diameter(RCD)growth of Sakhalin fir seedlings under various degrees of cover by deciduous vegetation and evergreen dwarf bamboo.Generalized additive models were used to quantify the effects of canopy cover and forest floor cover on the relative growth rates of these two parameters.The canopy cover of Sakhalin fir seedlings had a nonlin-ear negative effect on both the height growth of seedlings in the subsequent year and the RCD growth in the current year,given the general growth pattern in this species,where height growth ceases in early summer and RCD growth con-tinues until autumn.Height growth declined sharply after the canopy cover rate exceeded 50%,while RCD growth declined rapidly between 0 and 50%canopy cover rate.The forest floor cover had a greater negative impact on RCD growth than on height growth.These results suggested that Sakhalin fir seedlings respond to vegetative competition by prioritizing height growth for light acquisition at the expense of diameter growth and possibly root growth for below-ground competition.The cover of evergreen dwarf bamboo reduced the height growth of fir seedlings significantly more than the cover of deciduous vegetation.This difference is likely due to the timing of light availability.When competing with deciduous vegetation,Sakhalin fir seedlings exposed to light during the post-snow melt and early spring before the development of the deciduous vegetation canopy can photosynthesize more effectively,leading to greater height growth.The results of this study highlighted the importance of vegetation control considering the type of vegetation for successful Sakhalin fir reforestation.Adjusting the intensity and timing of weeding based on the presence and abundance of dwarf bamboo and other competing vegetation could potentially reduce weeding costs and increase biodiversity in reforested areas.展开更多
目的:观察加味四妙勇安汤颗粒剂联合抗血小板及扩血管药物对于间歇性跛行下肢动脉硬化闭塞症(Atherosclerotic Occlusive Disease of the Lower Extremities,ASO-LE)的临床疗效及踝肱指数(Ankle Brachial Index,ABI)、血脂水平及炎性反...目的:观察加味四妙勇安汤颗粒剂联合抗血小板及扩血管药物对于间歇性跛行下肢动脉硬化闭塞症(Atherosclerotic Occlusive Disease of the Lower Extremities,ASO-LE)的临床疗效及踝肱指数(Ankle Brachial Index,ABI)、血脂水平及炎性反应因子的影响。方法:将116例间歇性跛行下肢动脉硬化闭塞症患者按照病情等级分层随机抽样分为治疗组58例,对照组58例。2组均给予生理盐水250 m L加入丹参川芎嗪注射液10 m L静脉滴注,1次/d,拜阿司匹林100 mg,1次/d,作为基础治疗。治疗组在此基础上加服加味四妙勇安汤颗粒剂。测定治疗前后总胆固醇(Tch)、三酰甘油(TG)、高密度脂蛋白胆固醇(HDL-Ch)、低密度脂蛋白胆固醇(LDL-Ch),肿瘤坏死因子α(TNF-α)、细胞白介素18(Interleukin-18,IL-18)及踝肱指数(Ankle Brachial Index,ABI)水平变化。结果:治疗组总有效率94.83%优于对照组79.31%(P<0.01),治疗后2组总胆固醇(Tch)、三酰甘油(TG)、低密度脂蛋白胆固醇(LDL-Ch),肿瘤坏死因子α(TNF-α)、细胞白介素18(IL-18)水平均较治疗前明显下降(P<0.01),且治疗组明显优于对照组(P<0.01);治疗后2组高密度脂蛋白胆固醇(HDL-Ch)及踝肱指数(ABI)较治疗前明显升高(P<0.01),且治疗组明显高于对照组(P<0.01)。结论:加味四妙勇安汤治疗间歇性跛行下肢动脉硬化闭塞症疗效显著,可有效降低患者血脂水平并提高患者的踝肱指数,其作用机制可能与抗炎、降脂、改善血液循环、抗血管内皮损伤有关。展开更多
文摘Selenium is a trace element that can have both beneficial and harmful effects on aquatic life. The Aby Lagoon is a coastal environment in Côte d’Ivoire that receives selenium inputs from various natural and anthropogenic sources. The aim of this study was to assess the levels of selenium in the sediments of the Aby Lagoon and its tributaries, the Tanoe River and the Tendo Lagoon, and to examine the spatial and seasonal variations of selenium concentrations. Sediment samples were collected from different sites and seasons, and selenium concentrations were measured by atomic fluorescence spectrometry. The results showed that the average concentration of selenium in the sediments of the Aby Lagoon was 0.82 mg/kg, indicating moderate contamination. The concentration of selenium varied between sites and seasons, with higher values in the channel of the Tendo Lagoon and during the dry season. The study highlighted the complexity of selenium dynamics in aquatic ecosystems, and the need to take into account seasonal and spatial variability as well as interactions between environmental factors. The study also suggested potential ecotoxicological risks for some sensitive organisms in certain areas of the lagoon. This study contributes to the knowledge of the dynamics of selenium in lagoon ecosystems and to the assessment of the environmental risks associated with its presence.
基金supported by the Ministry of Agriculture,Forestry,and Fisheries of Japan (25093 C)JSPS KAKENHI (JP23H02262)
文摘The growth of Sakhalin fir(Abies sachalinen-sis)seedlings,an important forest tree species in northern Hokkaido,Japan,is significantly affected by competition from surrounding vegetation,especially evergreen dwarf bamboo.In this study,we investigated the height and root collar diameter(RCD)growth of Sakhalin fir seedlings under various degrees of cover by deciduous vegetation and evergreen dwarf bamboo.Generalized additive models were used to quantify the effects of canopy cover and forest floor cover on the relative growth rates of these two parameters.The canopy cover of Sakhalin fir seedlings had a nonlin-ear negative effect on both the height growth of seedlings in the subsequent year and the RCD growth in the current year,given the general growth pattern in this species,where height growth ceases in early summer and RCD growth con-tinues until autumn.Height growth declined sharply after the canopy cover rate exceeded 50%,while RCD growth declined rapidly between 0 and 50%canopy cover rate.The forest floor cover had a greater negative impact on RCD growth than on height growth.These results suggested that Sakhalin fir seedlings respond to vegetative competition by prioritizing height growth for light acquisition at the expense of diameter growth and possibly root growth for below-ground competition.The cover of evergreen dwarf bamboo reduced the height growth of fir seedlings significantly more than the cover of deciduous vegetation.This difference is likely due to the timing of light availability.When competing with deciduous vegetation,Sakhalin fir seedlings exposed to light during the post-snow melt and early spring before the development of the deciduous vegetation canopy can photosynthesize more effectively,leading to greater height growth.The results of this study highlighted the importance of vegetation control considering the type of vegetation for successful Sakhalin fir reforestation.Adjusting the intensity and timing of weeding based on the presence and abundance of dwarf bamboo and other competing vegetation could potentially reduce weeding costs and increase biodiversity in reforested areas.
文摘目的:观察加味四妙勇安汤颗粒剂联合抗血小板及扩血管药物对于间歇性跛行下肢动脉硬化闭塞症(Atherosclerotic Occlusive Disease of the Lower Extremities,ASO-LE)的临床疗效及踝肱指数(Ankle Brachial Index,ABI)、血脂水平及炎性反应因子的影响。方法:将116例间歇性跛行下肢动脉硬化闭塞症患者按照病情等级分层随机抽样分为治疗组58例,对照组58例。2组均给予生理盐水250 m L加入丹参川芎嗪注射液10 m L静脉滴注,1次/d,拜阿司匹林100 mg,1次/d,作为基础治疗。治疗组在此基础上加服加味四妙勇安汤颗粒剂。测定治疗前后总胆固醇(Tch)、三酰甘油(TG)、高密度脂蛋白胆固醇(HDL-Ch)、低密度脂蛋白胆固醇(LDL-Ch),肿瘤坏死因子α(TNF-α)、细胞白介素18(Interleukin-18,IL-18)及踝肱指数(Ankle Brachial Index,ABI)水平变化。结果:治疗组总有效率94.83%优于对照组79.31%(P<0.01),治疗后2组总胆固醇(Tch)、三酰甘油(TG)、低密度脂蛋白胆固醇(LDL-Ch),肿瘤坏死因子α(TNF-α)、细胞白介素18(IL-18)水平均较治疗前明显下降(P<0.01),且治疗组明显优于对照组(P<0.01);治疗后2组高密度脂蛋白胆固醇(HDL-Ch)及踝肱指数(ABI)较治疗前明显升高(P<0.01),且治疗组明显高于对照组(P<0.01)。结论:加味四妙勇安汤治疗间歇性跛行下肢动脉硬化闭塞症疗效显著,可有效降低患者血脂水平并提高患者的踝肱指数,其作用机制可能与抗炎、降脂、改善血液循环、抗血管内皮损伤有关。
