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关键词： 沉水植物   生物量   叶绿素   水质理化指标   相关分析  

摘要： 为探讨沉水植物生长影响的水质理化性质,通过室外静态模拟实验,3种沉水植物在高中低3种不同污染浓度的底质中,室内分析测定了沉水植物生物学指标和水质指标,并进行水体水质理化性质与沉水植物生物量、株高、分枝数、叶绿素之间的相关关系研究,数据的典型相关分析结果表明:在低污染底质条件下,水体中污染物浓度与粉绿狐尾藻和竹叶眼子菜的生长呈显著负相关;与金鱼藻的生长呈显著正相关。在中度污染底质条件下,水体中污染物浓度与粉绿狐尾藻的生长呈显著正相关;与竹叶眼子菜和金鱼藻的生长呈显著负相关。在高污染底质条件下,水体中污染物浓度与粉绿狐尾藻、竹叶眼子菜和金鱼藻的生长呈显著负相关。

关键词： 细胞生物学   植物解剖学   竞赛试题   奥林匹克   生理学   国际   蛋白印迹   迁移距离  

摘要： 细胞生物学 1下面Westernblot蛋白印迹显示5个参与生长激素调节的细胞信号通路的蛋白信号分子（a～e）的迁移距离。（2．7分）

关键词： Biological Network   Custom Network   Online Portal   Video Tutorial   Integrative System Biology  

摘要： Background: Plants are important as foods, pharmaceuticals, biorenewable chemicals, fuel resources, bioremediation tools and general tools for recombinant technology. The study of plant biological pathways is advanced by easy access to integrated data sources. Today, various plant data sources are scattered throughout the web, making it increasingly complicated to build comprehensive datasets. Results: MetNet Online is a web-based portal that provides access to a regulatory and metabolic plant pathway database. The database and portal integrate Arabidopsis, soybean (Glycine max) and grapevine (Vitis vinifera) data. Pathways are enriched with known or predicted information on sub cellular location. MetNet Online enables pathways, interactions and entities to be browsed or searched by multiple categories such as sub cellular compartment, pathway ontology, and GO term. In addition to this, the "My MetNet" feature allows registered users to bookmark content and track, import and export customized lists of entities. Users can also construct custom networks using existing pathways and/or interactions as building blocks. Conclusion: The site can be reached at http://***. Extensive video tutorials on how to use the site are available through http://***/tutorial/.

关键词： 农药   传导方式   农药传导生物学  

摘要： 农药在植物体内的传导方式是影响其使用方法和使用效果的重要因素之一。依据农药传导生物学的理论提出农药进入植物体内包括内吸和传导两个性质完全不同的过程。在植物体上的内吸应该是所有化合物均有可能发生的行为,但并不是所有化合物都能进行真正意义上的传导。具有在植物体内进行传导的化合物可以称为传导性农药以区别于内吸作用。农药在植物体内的传导既决定于化合物本身分子结构特征,也受植物解剖学和生理学的影响。故农药的传导是这两者结合的具体表现。换言之,对于一个具体的化合物而言,其传导与否并不是一个绝对的概念。它们会因植物种类的不同及其所处的生理状态不同而发生改变,甚至其传导方式也会因使用方式的不同而改变。因此,化合物的传导性应该更多地属于农药的使用技术范畴,而不仅仅是一个化合物的作用方式概念的独立表述。

关键词： 盐胁迫   沉水植物   生物学指标   丙二醛含量  

摘要： 以沉水植物苦草、轮叶黑藻、狐尾藻为研究对象,分别研究了在不同盐度下3种沉水植物的生物学指标和生理状况,以期为沿海地区水系沉水植物构建提供依据。结果表明,在0.05mol/L盐度下轮叶黑藻、苦草出现生长抑制,株高、鲜质量下降,叶片中丙二醛含量增加,单株叶片面积减小,而狐尾藻在0.05mol/L盐度下生长良好,0.08mol/L盐度下出现株高、鲜质量下降,叶片中丙二醛含量增高的现象。因此,推荐盐度在0.05mol/L以下的水体,可以建植苦草和轮叶黑藻,盐度不高于0.08mol/L的水体可以建植狐尾藻。盐胁迫下沉水植物会表现为一定的抗逆性,会通过单株叶片面积减小、增加根冠比、叶片肉质化等措施来减少水分流失和保证机体的正常生理功能,但超过一定的阀值,抗逆性会减弱,导致沉水植物出现生长抑制或者死亡现象。在有一定盐度的水体进行沉水植物建植恢复,该沉水植物能够耐受的盐度高于水体的盐度,是保证沉水植物成活的基本前提。

关键词： 小热激蛋白   分子伴侣   生物学功能  

摘要： 植物中的小热激蛋白(sHSPs)含量丰富,种类繁多。除高温外,sHSPs还被其他多种胁迫诱导,亦能受植物正常发育过程调控。sHSPs由核基因编码,其典型特征是有1个保守的α-晶状体蛋白域结构。通常植物sHSPs具有分子伴侣功能,在不依赖ATP的情况下阻止变性蛋白的聚集,从而对植物抵抗、适应胁迫环境以及生长发育起着重要作用。文章对植物中sHSPs的种类、蛋白结构特征和生物学功能进行了综述。

关键词： 白刺   生物生态学特性   快繁技术  

摘要： 对白刺的生物、生态学特性,特别是快繁技术进行了深入研究,为我国西部地区荒漠化治理和白刺这一野生植物种群的保护与繁育提供科学依据。

关键词： 植物生物学   陕西省   中国作物学会   杨凌   西北农林科技大学   细胞生物学   国际会展中心   分子生物学  

摘要： 10月10～13日，2012全国植物生物学大会（NationalCongressofPlantBiology,NCPB一2012）在陕西省杨凌国际会展中心召开。此次会议主题是“从植物科学到农业发展”，由中国细胞生物学学会、中国遗传学会、中国植物学会、中国作物学会和中国植物生理与植物分子生物学学会联合举办，中国细胞生物学学会植物器官发生分会和西北农林科技大学协办。来自全国各科研院所，大专院校的近900名代表参加了本次会议。

关键词： Eduard Strasburger   Cell polarity   Cytokinesis   Cytoplasmic streaming   Fertilization   Karyokinesis   Plant cell biology   Strasburger cells  

摘要： Eduard Strasburger, director of the Botany Institute and the Botanical Garden at the University of Bonn from 1881 to 1912, was one of the most admirable scientists in the field of plant biology, not just as the founder of modern plant cell biology but in addition as an excellent teacher who strongly believed in "education through science." He contributed to plant cell biology by discovering the discrete stages of karyokinesis and cytokinesis in algae and higher plants, describing cytoplasmic streaming in different systems, and reporting on the growth of the pollen tube into the embryo sac and guidance of the tube by synergides. Strasburger raised many problems which are hot spots in recent plant cell biology, e.g., structure and function of the plasmodesmata in relation to phloem loading (Strasburger cells) and signaling, mechanisms of cell plate formation, vesicle trafficking as a basis for most important developmental processes, and signaling related to fertilization.

关键词： Binary potential outcomes   causal inference   maximum likeli hood   propensity scores  

摘要： Observational studies of relatively large data can have potentially hidden heterogeneity with respect to causal effects and propensity scores{patterns of a putative cause being exposed to study subjects. This underlying heterogeneity can be crucial in causal inference for any observational studies because it is systematically generated and structured by covariates which inuence the cause and/or its related outcomes. Addressing the causal inference problem in view of data structure, machine learning techniques such as tree analysis can be naturally necessitated. Kang, Su, Hitsman, Liu and Lloyd-Jones (2012) proposed Marginal Tree (MT) procedure to explore both the confounding and interacting effects of the covariates on causal inference. In this paper, we extend the MT method to the case of binary responses along with a clear exposition of its relationship with established causal odds ratio. We assess the causal effect of dieting on emotional distress using both a real data set from the Lalonde's National Supported Work Demonstration Analysis (NSW) and a simulated data set from the National Longitudinal Study of Adolescent Health (Add Health). [ABSTRACT FROM AUTHOR]