北京水系中腐霉和疫腐霉种类调查

为研究北京地区水系中腐霉和疫腐霉种类分布,采用叶饵法从北京水系中诱集菌株,共分离到腐霉、疫腐霉182株,利用Single-strand conformation polymorphism (SSCP)进行分析,筛选出不同基因型的代表菌株,并依据形态学特征及ITS序列对这些菌株进行种类鉴定。结果共发现6个已知种和3个可能的新种,其中:湖滨疫腐霉Phytopythium litorale和果胶裂解腐霉Pythium pectinolyticum为国内新记录种;旋柄疫腐霉Pp.helicoides、异丝腐霉P.diclinum、簇囊腐霉P.torulosum和袋囊腐霉P.marsipium为北京地区新记录种。研究结果可为未来监测北京地区水系中病原菌的分布情况提供基础数据。     

缩短500 kV某变电站生产投运时间

根据国家电网公司《国家电网公司变电运维管理办法》等6项通用制度的规定。通用制度中明确对变电站内设备验收、运维、检修、检测、评价和反事故措施等方面提出了新标准和要求,国家电网要求生产投运周期控制在90天以内。为此,小组对近几年安徽检修分公司所辖500 kV变电站的新建、扩建工程所须时间进行统计分析,结果表明,新站投运所需时间大约在110天左右,离国家电网公司对新建变电站投运时间上的最新要求存在一定差距。另外,生产投运周期过长也严重影响了新站投运、扩建工程的进度,阻碍了电网快速发展,也不符合十三五电网规划的要求。考虑如何提高变电站工程生产投运效率,已成为满足电网规划发展、保障安全供电要求的当务之急。因此,QC小组确定此次QC活动的课题为“缩短500 kV某变电站生产投运时间”。     

Nitrogen transformation mediated by nitrate-dependent iron oxidation in anoxic freshwater

Journal of Soils and Sediments - Fe(III) transformation to Fe(II) via the nitrate-dependent iron oxidation process, occurring in anoxic sediments, has an important role in the nitrogen cycle. In...     

斑潜蝇化学生态学研究探讨

指出了多数斑潜蝇是农业和观赏植物上的重要害虫,分析了寄主植物和非寄主植物的化学成分介导斑潜蝇和其寄主的行为,斑潜蝇与其寄主用化学信号来确定其寄主,提出了诱导成分可以被用来作为诱导天敌的诱导剂或是斑潜蝇的驱避剂。     

法国凡尔赛宫苑的造园艺术成就

指出了法国的造园艺术成就最集中的体现就是凡尔赛宫苑.它在继承意大利园林的基础上,创造了一种新的“伟大风格”,反映了绝对的君权至上.凡尔赛宫宏伟壮丽、中轴线突出、严谨对称、风格多样等的特点,具有很高的艺术成就.     

白色金针菇工厂化生产技术与装备体系研究

白色金针菇工厂化生产使用规范化的硬件设施,采用标准化的生产流程和层层把关的有效管理,生产受农业环境影响小,确保了产品的产量和品质。白色金针菇工厂化生产流程为:菌种选育与培养基(料)优化(包括基料选配、搅拌、装袋合灭菌等)→规范化生产(包括接种、培养、搔菌、出菇蕾、驯养、生长及采收等环节)与病虫害综合防治技术→商品菇分级包装。     

家禽营养与表观遗传学

过去几十年里,达尔文创立的生物进化论及孟德尔确立的遗传学说为家禽选育及品种的改良奠定了理论基础,并显著改善了禽肉品质,提高了家禽生产力。尽管遗传选择能够主导亲代基因传递给后代,但越来越多的证据表明营养等环境因素对基因表达具有重要的修饰作用。表观遗传学是研究在核苷酸序列不变的情况下,基因表达的可遗传变化的一门遗传学分支学科。本文主要讨论了家禽营养对DNA甲基化的影响,以及这种影响通过生殖细胞的表观遗传重塑可以成功地传递给后代的现象。     

光箨篌竹立竹度,轮伐期试验研究

对光箨篌竹林立竹度、轮伐期的试验研究结果表明,其最佳立竹度为3500株/0.07hm~2,合理的伐期为1a,这样,不但能提高单位面积1年生竹产量与质量,同时还能较大地提高竹材产出量。     

凤眼莲动态模块化治理湖泊污染的设计

指出了环境生态工程采用生态学理论,强调将环境问题于系统内解决,使受污染的环境能够适时与周边的大自然友好和谐地融为一体,注重经济效益和生态效益的高度统一,已经逐步发展为最受欢迎的修复水体的技术之一。凤眼莲是修复污染湖泊的良好先锋植物,但其易泛滥成灾和含水量甚高的特性限制了人们对其大规模的使用。本着环境生态工程的理念,建立了凤眼莲动态模块化的浮床装置,利用风能为浮床装置提供电能,结合装置内的螺旋桨动力结构使浮床移动,通过旋转吊臂滑轮和底部尼龙网结构使凤眼莲机械化原位去水。此设计在实现低廉、高效治理水体富营养化和重金属等污染问题的同时,也有效解决了凤眼莲可能泛滥成灾的隐患,达到生态效益、经济效益和景观效益的协调统一。     

Physiological and related anthocyanin biosynthesis genes responses induced by cadmium stress in a new colored-leaf plant “Quanhong Poplar”

The worsening of Cadmium (Cd) pollution has intensified the urban ecological environment deterioration in the world. Purifying contaminated environment using the tall, colored-leaf woody plants has been proved as an aesthetically pleasing approach. However, the effects of Cd stress on colored-leaf woody plants have been little reported. Present hydroponic experiments were carried out to study the physiological and related anthocyanin biosynthesis genes responses to Cd stress in “Quanhong Poplar” plants. The experiments consisted of four Cd levels (0, 50, 100 and 150 μM). Leaves were sampled at 5, 10, 20, 30, 40, 50, and 60 days after the first treatment for detection of related enzyme activities and genes expression. The results showed that the plants treated with 100 or 150 μM Cd presented obvious toxicity symptom, i.e. the inhibition of growth and the decrease of chlorophyll and anthocyanin contents. However, plants growth was enhanced and the synthesis of chlorophyll, anthocyanin were promoted when the plants were subject to 50 μM Cd stress. Furthermore, the activities of relative enzymes as well as their genes expression were induced, which indicated that low concentration of Cd induced the anthocyanin accumulation in “Quanhong Poplar” plants, which suggested that using “Quanhong Poplar” to purify contaminated environment would be an aesthetically pleasing approach, which would not only remediate contaminated environments but also bring landscape effects.