Effects of Microcystis blooms on the crustacean plankton were studied using enclosure experiments during July-September, 2000. Eight enclosures were set in the hypereutrophic Donghu Lake. Different nutrient concentrat...Effects of Microcystis blooms on the crustacean plankton were studied using enclosure experiments during July-September, 2000. Eight enclosures were set in the hypereutrophic Donghu Lake. Different nutrient concentrations through additional nutrient and sediment in enclosures were expected to result in different abundance of Microcystis. From July to early August, the phytoplankton community was dominated by Chlorophyta, Cryptophyta, Bacillariophyta and Cyanophyta other than Microcystis aeruginosa. M. aeruginosa showed a rapid increase during early August in all enclosures and predominated. Crustacean plankton was dominated by the herbivorous Moina micrura, Diaphanosoma brachyurum and Ceriodaphnia cornuta, and the predaceous Mesocyclops sp. and Thermocyclops taihokuensis. During the pre-bloom period, the dynamics of M. micrura population appeared to be mainly affected by the predaceous cyclopoids. With the development of Microcystis blooms, such interaction between M. micrura and cyclopoids seemed weakened, especially when the Microcystis biomass was high. But there was no apparent influence on the interaction between Leptodora kindti and its zooplanktonic prey. The density of two cyclopoids decreased with the enhancement of Microcystis. The density decline of M. micrura was caused by both predation and inhibition by Microcystis. The low food availability of other edible phytoplankton during the blooms led to low densities of both C. cornuta and D. brachyurum by late August. It appears that dense Microcystis blooms exert strong negative effects on the herbivorous cladocerans and the predaceous cyclopoids.展开更多
[Objective]This study aims to develop an efficient regeneration system for kenaf(Hibiscus cannabinus L.),which is expected to lay a basis for breeding via genetic modification and improving the fibre yield.[Method]The...[Objective]This study aims to develop an efficient regeneration system for kenaf(Hibiscus cannabinus L.),which is expected to lay a basis for breeding via genetic modification and improving the fibre yield.[Method]The influence of kenaf variety,hormone for callus induction,and explant type on the regeneration was examined.[Result]The optimal variety and explant for the regeneration were K89 and cotyledon,respectively.The 6-benzylaminopurine(6-BA)was suitable for callus induction and the optimum concentration was 2 mg/L.In addition,with this cytokinin,1.7~4.0 adventitious buds were produced,and 27.7%~38.3% of the adventitious buds could grow to plants.Adventitious roots can be induced with 0.2 mg/L naphthylacetic acid(NAA)and 0.1 mg/L indole-3-acetic acid(IAA).[Conclusion]Cotyledon of K89 had huge potential for the regeneration of kenaf.展开更多
目的:分析原发性胰腺癌的中医证型与增强CT影像表现的相关性。方法:70例原发性胰腺癌患者均接受增强CT检查,同时收集患者的临床生化指标,并对不同证型患者的增强CT影像表现统计分析,探讨不同生化指标及增强CT影像表现与中医证型的相关...目的:分析原发性胰腺癌的中医证型与增强CT影像表现的相关性。方法:70例原发性胰腺癌患者均接受增强CT检查,同时收集患者的临床生化指标,并对不同证型患者的增强CT影像表现统计分析,探讨不同生化指标及增强CT影像表现与中医证型的相关性。结果:70例胰腺癌患者包括26例气滞血瘀型、21例肝胆湿热型及23例脾肾虚损型,3种证型对应的肿瘤大小差异存在统计学意义[(4.10±0.78)cm vs (3.70±0.74)cm vs(3.43±1.30)cm,P<0.05];与另外两型比较,气滞血瘀型患者CA19-9表达水平更高(P<0.05),且肿瘤呈囊实性及出现胰周侵犯的概率更高(P<0.05);病灶在胰实质期、门脉期的CT值与病灶/胰实质的CT比值比对于证型的鉴别诊断具有提示意义(P<0.05)。结论:CA19-9表达水平及增强CT影像表现能够对原发性胰腺癌的临床中医辨证提供客观化依据。展开更多
基金The Key Project of Chinese Academy of Sciences(No. KZCX1_SW_12) and Chinese Postdoctoral Fundation(No.2003034392)
文摘Effects of Microcystis blooms on the crustacean plankton were studied using enclosure experiments during July-September, 2000. Eight enclosures were set in the hypereutrophic Donghu Lake. Different nutrient concentrations through additional nutrient and sediment in enclosures were expected to result in different abundance of Microcystis. From July to early August, the phytoplankton community was dominated by Chlorophyta, Cryptophyta, Bacillariophyta and Cyanophyta other than Microcystis aeruginosa. M. aeruginosa showed a rapid increase during early August in all enclosures and predominated. Crustacean plankton was dominated by the herbivorous Moina micrura, Diaphanosoma brachyurum and Ceriodaphnia cornuta, and the predaceous Mesocyclops sp. and Thermocyclops taihokuensis. During the pre-bloom period, the dynamics of M. micrura population appeared to be mainly affected by the predaceous cyclopoids. With the development of Microcystis blooms, such interaction between M. micrura and cyclopoids seemed weakened, especially when the Microcystis biomass was high. But there was no apparent influence on the interaction between Leptodora kindti and its zooplanktonic prey. The density of two cyclopoids decreased with the enhancement of Microcystis. The density decline of M. micrura was caused by both predation and inhibition by Microcystis. The low food availability of other edible phytoplankton during the blooms led to low densities of both C. cornuta and D. brachyurum by late August. It appears that dense Microcystis blooms exert strong negative effects on the herbivorous cladocerans and the predaceous cyclopoids.
文摘[Objective]This study aims to develop an efficient regeneration system for kenaf(Hibiscus cannabinus L.),which is expected to lay a basis for breeding via genetic modification and improving the fibre yield.[Method]The influence of kenaf variety,hormone for callus induction,and explant type on the regeneration was examined.[Result]The optimal variety and explant for the regeneration were K89 and cotyledon,respectively.The 6-benzylaminopurine(6-BA)was suitable for callus induction and the optimum concentration was 2 mg/L.In addition,with this cytokinin,1.7~4.0 adventitious buds were produced,and 27.7%~38.3% of the adventitious buds could grow to plants.Adventitious roots can be induced with 0.2 mg/L naphthylacetic acid(NAA)and 0.1 mg/L indole-3-acetic acid(IAA).[Conclusion]Cotyledon of K89 had huge potential for the regeneration of kenaf.
文摘目的:分析原发性胰腺癌的中医证型与增强CT影像表现的相关性。方法:70例原发性胰腺癌患者均接受增强CT检查,同时收集患者的临床生化指标,并对不同证型患者的增强CT影像表现统计分析,探讨不同生化指标及增强CT影像表现与中医证型的相关性。结果:70例胰腺癌患者包括26例气滞血瘀型、21例肝胆湿热型及23例脾肾虚损型,3种证型对应的肿瘤大小差异存在统计学意义[(4.10±0.78)cm vs (3.70±0.74)cm vs(3.43±1.30)cm,P<0.05];与另外两型比较,气滞血瘀型患者CA19-9表达水平更高(P<0.05),且肿瘤呈囊实性及出现胰周侵犯的概率更高(P<0.05);病灶在胰实质期、门脉期的CT值与病灶/胰实质的CT比值比对于证型的鉴别诊断具有提示意义(P<0.05)。结论:CA19-9表达水平及增强CT影像表现能够对原发性胰腺癌的临床中医辨证提供客观化依据。
