海洋微藻胞外产物的实验研究

本文对11种海洋微藻的胞外多糖、胞外氮和胞外碳的分泌情况及其与培养条件的关系进行了初步的研究。 在不同理化培养条件下，硅藻细胞数目和胞外多糖（EPS）的分泌变化规律为：当培养液初始pH值为8，环境温度为22℃，光照强度3500Lux,光照周期为12L:12D时，硅藻细胞分泌EPS的量最大。红绿光质及磷盐、氮盐浓度可促进硅藻EPS的分泌。硅藻的最适生长条件则因藻种不同而有很大差异。同时藻细胞密度的大小与EPS分泌量之间密切相关，培养液EPS含量的最大值一般出现在硅藻生长的静止期。不同浓度的藻液对真菌白假丝酵母（Candidaalbicans）均有抑制生长的作用，对革兰氏阴性菌（大肠杆菌Esch...学位：理学硕士院系专业：生命科学学院生物学系_植物学学号：19982600

Progresses of plants response to cadmium

总结了近年来植物对一重要环境污染物镉的反应研究报道。探讨了镉对植物的各种毒性效应 ,并论述植物对镉胁迫采取的相应防御机制 ,如络合 ( PC、MT)、应激 (应激乙烯、应激蛋白 ) ,及额外防御机制 ,如细胞壁固定化、原生质膜排除、区域化、过氧化物酶等 【英文摘要】 The paper summarizes progresses in the field of plants response to cadmium(Cd), an important and widespread heavy metal in enviroment.We analyse the toxic effects of Cd on plants and discuss the response mechanisms of plants to Cd stress including exclusion, immobilization and compartmentalization of the ions, synthesis of phytochelatins and metallothionein, inducements of stess protein and stess ethylene. The higher plants are able to uptake Cd depending on concentration and bioavailability of Cd in the ...国家自然科学基金资助项目 ( 3980 0 0 87;39870 6 30

海洋微藻胞外产物研究进展

厦门大学国家教育部海洋生态环境开放研究实验室(MEE)开放基金(MEE9903);; 教育部留学回国人员科研启动基金(教外司留[1999])363号资助项

Progress in Plant Resistance Induced by Salicylic Acid

水杨酸是一种重要的内源信号分子 ,能够激活一系列植物抗性防卫反应 .为了研究这种抗性反应 ,对水杨酸诱导植物抗病性、抗旱性、抗盐性及与乙烯作用的新进展作了概述 ,并从水杨酸与过氧化氢及其代谢酶类相互作用的角度探讨了水杨酸诱导植物抗性生理的分子机理 【英文摘要】 Salicylic acid is an important endogenous signal molecule. It can activate several plant defense responses. New progresses in plant disease resistance, drought resistance, salt resistance and the interaction of salicylic acid with ethylene, and the molecular mechanisms of salicylic acid inducing plant resistance have been established at the interaction of salicylic acid with hydrogen peroxide and its metabolizing enzymes

Occupational stress on self-efficacy and life satisfaction of teachers

目的:了解高校教师一般自我效能感对生活满意度的影响及其作用机制。方法:采用一般自我效能感量表、高校教师职业压力和生活满意度量表对某省高校183名教师进行调查。采用SPSS22.0统计软件对数据进行描述统计和相关分析,SPSS的宏程序PROCESS的进行中介检验。结果:(1)高校教师一般自我效能感与其生活满意度呈显著正相关,与其职业压力呈显著负相关;高校教师职业压力与其生活满意度呈显著负相关。(2)高校教师一般自我效能感能显著预测其职业压力,职业压力能显著预测其生活满意度,即职业压力在一般自我效能感与生活满意度之间起中介作用。结论:高校教师一般自我效能感不仅会直接地影响其生活满意度,而且还可以通过职业压力间接地对生活满意度产生影响。</p

中职生的成就动机与情绪问题的关系

成就动机(Achievementmotivation)是个体具有的对自己认为重要或者是有价值的工作,努力克服困难、精益求精,以达到理想境界的一种内在推动力量,包括追求成功和回避失败两种基本的动机1. 成就动机与个体情绪体验密切相关,追求成功的人能更多地体验到积极情绪而较少体验到消极情绪2. 随着中职生招生规模不断扩大,其个体发展和社会适应越来越受到人们的关注. 本研究探讨中职生的成就动机和情绪问题之间的关

EXTRACELLULAR DISSOLVED ORGANIC CARBON OF A MARINE NANOPLANKTONIC DIATOM CHAETOCEROS SP.:INFLUENCE OF DAILY RHYTHM,LIGHT AND TEMPERATURE

正> The extracellular dissolved organic, carbon (DOC) and algal cell particlutate organiccarbon (POC) of a marine nanoplanktonic diatom Chaetoceros sp. were determined in this study. Thedaily rhythm and the influence of light and temperature on the production rate of DOC and POC were stud-ied by growing the diatom under different laboratory controlled conditions of light and temperature. Theresults showed that the production of DOC and POC varied with light and temperature and were generallyhigher at daytim... 【英文摘要】 The extracellular dissolved organic carbon (DOC) and algal cell particJuiate organic carbon (POC) of a marine nanoplanktonic diatom Chaetoceros sp. were determined in this study. The daily rhythm and the influence of light and temperature on the production rate of DOC and POC were studied by growing the diatom under different laboratory controlled conditions of light and temperature. The results showed that the production of DOC and POC varied with light and temperature and were generally higher at dayti...This work was supported by the MEE Key Laboratory of Ministry of Education,Xiamen University(Grant No.MEE9903)and by Ministry of Education Foundation for University Key Teache

中职生的成就动机与情绪问题的关系

成就动机(Achievementmotivation)是个体具有的对自己认为重要或者是有价值的工作,努力克服困难、精益求精,以达到理想境界的一种内在推动力量,包括追求成功和回避失败两种基本的动机1. 成就动机与个体情绪体验密切相关,追求成功的人能更多地体验到积极情绪而较少体验到消极情绪2. 随着中职生招生规模不断扩大,其个体发展和社会适应越来越受到人们的关注. 本研究探讨中职生的成就动机和情绪问题之间的关