摘要：
Laboratory batch experiments were conducted to study arsenic （As） removal from a naturally contaminated soil using phosphoric acid （H_3PO_4） and potassium dihydrogen phosphate （KHEPO_4）. Both H_3PO_4 and KHEPO_4 proved to reduce toxicity of the soil in terms of soil As content, attaining more than 20% As removal at a concentration of 200 mmol/L. At the same time, acidification of soil and dissolution of soil components （Ca, Mg, and Si） resulted from using these two extractants, especially H_3PO_4. The effectiveness of these two extractants could be attributed to the replacement of As by phosphate ions （PO~(3-)_4）. The function of H_3PO_4 as an acid to dissolve soil components had little effects on As removal. KH_2PO_4 almost removed as much As as H_3PO_4, but it did not result in serious damage to soils, indicating that it was a more promising extractant. The results of a kinetic study showed that As removal reached equilibrium after incubation for 360 rain, but dissolution of soil components, especially Mg and Ca, was very rapid. Therefore dissolution of soil components would be inevitable if As was further removed. Elovich model best described the kinetic data of As removal among the four models used in the kinetic study.
作者机构：
[于晓英] College of Horticulture and Landscapes, Hunan Agricultural University, Changsha 410128, China;[谢永宏] WWF-China International Research Center of Wetland in Dongting Lake, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;[杨刚; 侯志勇; 任勃] College of Horticulture and Landscapes, Hunan Agricultural University, Changsha 410128, China, WWF-China International Research Center of Wetland in Dongting Lake, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
通讯机构：
[Hou, Z.-Y.] C;College of Horticulture and Landscapes, Hunan Agricultural University, China
摘要：
胆囊收缩素（Cholecystokinill，CCK）又称作促胰酶素，是一种能引起胆囊收缩和促进胰液中各种酶分泌的胃肠道多肽激素。CCK广泛存在于消化系统、中枢及外周神经系统，对动物采食具有抑制作用。猪缩胆囊素受体（Cholecystokinin A receptor，CCKAR）在动物采食量、饱度以及肥胖方面起调节控制作用。本文综述了近些年来CCK及CCKAR对动物采食量影响的研究状况。
作者机构：
湖南农业大学,生物科学技术学院,湖南,长沙,410128;英国萨里大学,生物医学与分子科学学院,食品营养与安全研究中心,吉尔福德,萨里郡,CU2 7XH;[CLIFFORD Michael N.] 萨里大学;[WANG Zheng] 湖南农业大学
通讯机构：
College of Bioscience and Biotechnology, Hunan Agricultural University, China
关键词：
LC-MSn
摘要：
To investigate the chlorogenic acids resources in Eucommia ulmoides Olive leaves, Lonicera japonica Thunb. leaves and Houttuynla cordata Thunb. leaves, methanolic extracts of these three materials have been analysed qualitatively for chlorogenic acids and their derivatives by structure-diagnostic LC-MSn. Three monocaffeoylquinic acids (3-CQA, 4-CQA, 5-CQA) were detected. 5-CQA dominated this subgroup in Eucommia ulmoides Olive and Lonicera japonica Thunb. leaves, but 3-CQA and 4-CQA dominated this subgroup of chlorogenic acids in the leaves of Houttuynla cordata Thunb. Caffeoylquinic acid-glycosides were detected for the first time from Eucommia ulmoides leaves. 5-FQA was found in Lonicera japonica Thunb. leaves, and 3-FQA and 4-pCoQA have been identified in Houttuynla cordata Thunb. This is the first report of the chlorogenic acid profile in Houttuynla cordata Thunb. The comparatively unusual profile of caffeoylquinic acids in Houttuynla cordata Thunb. makes it a convenient source of 3-CQA and 4-CQA that are not commercially available.
