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关键词： 叶面积   草甸植物   植物群体   生物学产量   叶面积系数   海北  

摘要： 植物在一生通过光合作用形成的全部产量,减去一生中的呼吸消耗和脱落,剩下的干重,包括形成根、茎、花、果实和种子等器官,即所谓生物学产量.形成植物生物学

关键词： 植物   食物   太阳能   能源   人类   太阳辐射能   气候资源   植物资源   生物资源   生命科学   生物学  

摘要： 很多人在谈论21世纪将是生物学世纪。这种说法不一定确切。但是,一个时代前面冠以一个学科的名称,两者总得要有特殊的联系。也就是说,在此历史阶段中这学科必须是:(1) 学术上获得了重大进展,显示巨大潜力;(2) 对人类的生存和发展起非常重要的作用。那么生物学是否已接近这样一种状况呢?现试从植物生命科学的角度来简略讨论一下这个问题。人们常用生产者、消费者和分解者来分析多种生物的相互关系。其中,植物处于生产者的地位,它是无数生物得以生存、进化和繁荣的基础,因此它可以反映这问题的一个非常重要的侧面。

关键词： 超低温保存技术   长期保存   甘蔗   糖料作物   植物种质   低温生物学   基因资源   农业资源   种质资源   冰冻保护剂   创伤组织   愈伤组织  

摘要： 超低温生物学有可能解决种质的长期保存问题低温生物学与许多生物学问题具有密切的关系。它与植物生长发育的关系,植物的寒害和抗寒性,以及水果和蔬菜的低温保存等方面,已有过长期大量的工作;近十多年来,运用低温生物学的知识和技术对植物种质资源长期保存的研究,日益显露出它的重要作用,特别

关键词： 被子植物   生物学意义  

摘要： 该书介绍了在这一陆地生命演变史上,对最重要的事件之一所进行的跨学科的新研究观点,并研究了早白垩纪后期被子植物的惊人辐射及其生物学意义.

关键词： 植物分子生物学   商业   会议   外源基因   学术讨论会  

摘要： 一九五三年,沃森(Watson)和克里克(Crick)对生物科学作出了巨大贡献:发现了遗传物质DNA的双螺旋结构,于是诞生了分子生物学。 分子生物学的问世,是使人们从微观上更本质地认识生命现象、生理功能和代谢活动的分子基础的新起点。早起的分子生物学研究是以微生物和动物为对象的。微生物和动物分子生物学的发展给整个生物科学研究带来突飞猛进的生力,推进了其它领域的研究。

关键词： 分子生物学   肿瘤病   根癌病  

ISBN: (纸本)7030003845

摘要： 书名原文:Molecular biology of plant tumors:著者谢尔原题:舍尔:本书从分子生物学方面论述了植物瘤的诱因及其致瘤机理。

摘要： Arabidopsis thaliana is a small member of the mustard family, botanical information on which dates back to the 16th century. It has many advantages as a model system for plant molecular genetics, such as a short life cycle, small size, small genome size, and well developed classical genetics. Arabidopsis thus provides an alternative system to the commonly used crop plants for studies in the molecular genetics of plant physiology and development.

摘要： Applied and basic approaches to scientific inquiry were compared through a bibliometric analysis of two Canadian journals in plant biology. No differences were found between the journals in the distribution of citations across different sections of research articles (that is, Introduction, Methods, Results, and Discussion). Moreover, no contrasts were found in the frequency of multiple authorships or in the age distribution of cited works. However, the journals differed significantly on three other bibliometric measures: author affiliation, number of references per article, and publication format of cited works.

摘要： Temporal changes in chlorophyll a and primary production were followed in a Gulf Stream warm-core ring as it underwent an interaction with the Gulf Stream and a subsequent wind event. As the physical events altered the structure of the mixed layer, Chl a within the euphotic zone increased from about 10 to 42 mg m-2 while productivity rates increased from 140 to > 2,400 mg C m-2 d-1. Carbon-specific growth rates in Ring 81-D derived from ATP-C biomass and 14C productivity rates increased fivefold. Nanoplankton (< 20 .mu.m) initially accounted for nearly 90% of the total Chl a biomass in ring surface waters, although were was a subsurface maximum of net-plankton Chl a near the base of the euphotic zone before the wind event. After the wind event, Chl a was uniformly distributed throughout the mixed layer and net plankton accounted for an increased proportion of total Chl a standing stock and productivity. In the peripheral high velocity region and the surrounding Slope Water, phytoplankton standing stocks and productivity rates were less than the maximum values found at ring center. Our observations indicate that phytoplankton standing stock and productivity within a warm-core ring can increase rapidly in response to physical processes on the event time scale.

摘要： Euseius mesembrinus (Dean) (Acari: Phytoseiidae) was recently reported on Florida [USA] citrus for the first time. This mite was able to develop and reproduce when fed plant pollen of Spanish needle, Bidens pilosa L. and ice plant, Malephora crocea (Jacq.) or three spider mite species (Acari: Tetranychidae) including all stagses of Tetranychus urticae Koch, Eutetranychus banksi (McGregor), and larval and nymphal stages only of Panonychus citri (McGregor). The biology of E. mesembrinus was studied under laboratory conditions while being fed pollen of M. crocea. The developmental time for immature stages at 18, 22, 26, and ***.C was 11.50, 7.47, 4.54, and 4.40 days, respectively. This pattern fits a log-probit model with r2 = 0.940. Eggs hatched, but mortality in other stages was high at ***.C. The intrinsic rate of natural increase was 0.146, 0.250, and 0.246 at 22, 26, and ***.C. The optimum temperature for this phytoseiid to develop and increase on ice plant pollen was in the range of 26 to ***.C.