荒漠念珠藻抗氧化系统对紫外的反应及外源化合物的保护作用研究

论文选择荒漠结皮中的优势藻类Nostoc sp.为材料,研究紫外辐射条件下外源抗氧化剂对细胞光合活性和酶活性的保护效应。研究发现,外源SNP和L-NAC 的加入,对念珠藻在紫外光下的光合活性影响不大,而外源L-NNA和AsA的加入,可以显著促进紫外光下念珠藻的光合活性,说明二者有较好的保护效应。外源SNP、L-NAC、L-NNA和AsA对SOD活性均有明显的促进效应;而AsA

雨生红球藻紫外辐射下的反应及抗氧化剂对其的保护作用研究

论文以虾青素含量较高的雨生红球藻(Haematococcus pluvidlis)为材料,研究UV-B处理下,外源抗氧化剂对该藻生长、色素含量和各种抗氧化酶活性的影响。研究发现,随紫外辐射强度增加,叶绿体色素、叶绿素a和叶绿素b的含量在添加SNP和AsA无明显变化,在添加L-NAC和LNNA后明显降低;添加抗氧化剂处理的样品光电子速率明显高于未添加处理的样品;外源SNP处理后,CAT活

一种荒漠藻培养的方法

本发明公开了一种荒漠藻培养的方法。首先是配制荒漠藻培养液：采用硝酸钠、磷酸氢二钾、硫酸镁、氯化钙、柠檬酸、柠檬酸铁铵、乙二胺四乙酸二钠盐(EDTA)、碳酸钠,微量元素溶液A5按比例配制；其次是制备藻种；第三是跑道式循环培养池培养；第四是荒漠藻的收获；第五是荒漠藻的干燥。本发明方法易行、操作方便、设备简单、产量高、产品质量好、安全可靠,适用于工业化规模生产

失水-吸水过程中微鞘藻光合活性的特性

雨季来临时,干藻重新吸收水分,光合活性恢复,迅速生长。微鞘藻(Microcoleus vaginatus)藻体在失水过程中,光合活性降低;而干藻接种到流沙后,恢复生长,在生长后期,生物量可达27μg/cm2土壤。在重吸水中,离子对光合活性的恢复具有重要作用,相对于去离子水来说,BG-11培养液处理后活性恢复较高;K+和Mg2+的缺失,对光合活性有抑制作用,而Ca2+的缺失,造成光合活性恢复的延缓;较高浓度的胞外多糖(Extracellular polymeric substances,EPS)和热水溶性

Everyday politics

A strongly developed civil society is nowadays regarded as essential in the democratisation process. The breadth and diversity of civil society allow only broad definitions, such as it represents the people and functions as the conscience of the government , holding it responsible for what it was elected to do. And where there is no choice to be made in government, social movements are vital in bringing about changes. Farmers organisations, which can represent the rural population, have a vital role to play here. That role, and how civil society has developed and how it functions vis-à-vis the State and democratisation, have not been extensively researched until now. This compilation of 13 papers from the Council for the Development of Social Science Research in Africa (CODES-RIA) presents research findings on rural peasant organisations in Cameroon, Cape Verde, Kenya, Nigeria, Senegal, Sudan, Tunisia and Zimbabwe. An interesting collection, it pulls together very diverse experiences of different kinds of organisations, including ones organised on the basis of age, or activists interests, or a common objective such as community development, welfare or mutual support. You realise that the question Just how representative are they? has many answers. Peasant organisations and the democratisation process in Africa By M B Romdhane & S Moyo, CODESRIA, 2002. 374 pp. ISBN 2869781113 GBP 20.95 Euro 31.35 CODESRIA PO Box 3304, Dakar, Senegal Fax: +221 8241289 Email: [email protected] Orders from outside Senegal: African Books Collective Ltd The Jam Factory, 27 Park End Street, Oxford, OX1 1HU, UK Fax: +44 1865 793298 Email: [email protected] organisations and the democratisation process in Africa By M B Romdhane & S Moyo, CODESRIA, 2002. 374 pp. ISBN 2869781113 GBP 20.95 Euro 31.3

荒漠藻对流沙的固定方法

本发明公开了一种荒漠藻对流沙的固定方法，首先是藻种分离，将干旱、半干旱荒漠土表结皮研磨，无菌水浸泡后培养；其次是藻种纯化，将培养的藻种，用无菌接种棒、解剖针将藻种挑出，在无菌载玻片上灭菌，接入琼脂平板培养皿；第三是藻种培养，将分离，纯化的藻类接入液体培养基，在一定条件下，通气培养；第四是藻种筛选，将培养藻种接入室内及室外流沙，选择速度快、抗风蚀强的藻种与藻种搭配；第五是藻种保存，将所筛选的藻种培养后，离心收集，涂抹于丝绢之上，阴干、粉碎、过筛、干燥保存；第六是野外接种。本发明方法易行，能快速、高效、持久的固沙