Subjects: Biology >> Zoology submitted time 2018-12-25 Cooperative journals: 《动物营养学报》
Abstract：核桃青皮提取物具有较好的抑菌作用，本试验以核桃青皮及叶片中含量较高的7种植物次生代谢物为研究对象，评价其抑菌活性，为解析核桃青皮提取物的抑菌活性及开发新的饲用抗生素替代品提供参考。以大肠杆菌、枯草芽孢杆菌和金黄色葡萄球菌为受试菌，将7种植物次生代谢物——绿原酸、鞣花酸、丁香酸、芦丁、单宁酸、对羟基苯甲酸和胡桃醌稀释至1.000 0、0.500 0、0.250 0、0.125 0和0.062 5 mg/mL，采用滤纸片扩散法以培养24 h后抑菌圈直径大小反映植物次生代谢物的抑菌活性。结果显示：除大肠杆菌对羟基苯甲酸和单宁酸不敏感外，其他植物次生代谢物对3种受试菌均有不同程度的抑制作用。对大肠杆菌抑制作用的顺序为鞣花酸＞胡桃醌＞芦丁＝丁香酸＞绿原酸＞对羟基苯甲酸＝单宁酸；对枯草芽孢杆菌抑制作用的顺序为鞣花酸＞绿原酸＝对羟基苯甲酸＞丁香酸＞单宁酸＞芦丁＞胡桃醌；对金黄色葡萄球菌抑制作用的顺序为胡桃醌＞丁香酸＞芦丁＞单宁酸＞鞣花酸＞对羟基苯甲酸＞绿原酸。由此得出，绿原酸、鞣花酸、丁香酸、芦丁、单宁酸、对羟基苯甲酸和胡桃醌对大肠杆菌、枯草芽孢杆菌和金黄色葡萄球菌具有不同的抑制作用，其中鞣花酸对大肠杆菌和枯草芽孢杆菌有较强的抑制作用，胡桃醌对大肠杆菌和金黄色葡萄球菌具有较强的抑制作用。
Subjects: Statistics >> Social Statistics submitted time 2024-03-27 Cooperative journals: 《中国科学院院刊》
Abstract： The eco-environmental conservation and Beautiful China have entered the critical phase. Urbanized areas serve as important spatial carriers in the Beautiful China initiative scenarios, but the most prominent challenges in human-environment relationship and difficult points in building Beautiful China. This study focuses on the physical urban area, and utilizing big data technology to reexamine the spatiotemporal distribution and grouped evolution characteristics of impervious surface in cities, as well as the structural features of urban flow networks from space of flows. Moreover, preliminary thoughts and policy recommendations are provided for promoting high-quality development in urbanized areas of the new era. More efforts should be made in promoting the people-oriented urban construction, introducing the classified guidance on the diversified development path of cities, establishing green, resilient, and healthy urban sustainable models, strengthening technological innovation in smart city, implementing regular urban physical examination, etc., to achieve the realization for Chinese path to urbanization and modernization and Beautiful China initiative.
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