在冬夜里歌唱的鱼     

查一路 《中学生阅读(初中版)》2008,(Z1):14-15

天空是一片灰蒙蒙的苍茫,鸟儿去了岑寂的北方,火烧云沉到山的那一边。山冈上,风一阵冷过一阵,蒿草在风中颤抖。目光越过一道道山梁,一个人的影子就会在昏暗中裹挟着晚风,逐渐清晰。我和妹  相似文献   

铃兰族(广义)花粉形态与叶表皮特征的研究     

马黎明  洪德元 《中国科学院研究生院学报》1990,28(3):228-236

对铃兰族(广义)7个属分别作了花粉(17种)扫描电镜观察和叶表皮(12种)的光学显微镜和 扫描电镜观察。花粉可分为8个类型。在狭义的铃兰族的4个属内，花粉全为远极单槽，舟状。它们 的外壁除夏须草属外，都具细孔。夏须草属的花粉外壁则为细皱。  Hutchinson(1934)的蜘蛛抱蛋族 花粉形态变异很大，其中开口箭属和万年青属的花粉为远极单槽，舟形，外壁具穿孔或网纹，而蜘蛛抱 蛋属的花粉则为球状，无萌发孔。其间的显著差异支持Nakai为前两个属建立万年青族(Rohdeae)。 表1归纳了7个属的花粉形态；图1是我们对铃兰族(广义)花粉形态演化的见解。叶表皮观察表明，气 孔器为无规则型，上表皮角质层主要为条纹加厚，或均匀加厚，而铃兰属的角质层秕糠状加厚。7个属的叶表皮特征归纳于表2。  相似文献   

芍药属的研究(1)——国产几个野生种核型的报道   总被引：1，自引：0，他引：1  

洪德元  张志宪  朱相云 《中国科学院研究生院学报》1988,26(1):33-43

In the present paper 8 species with 15 populations of the genus Paeonia L. (if P. papaveracea and P. japonica are recognised as species) were collected from Sichuan, Shaanxi and Hebei provinces (see the Appendix for detail of the materials).  The micrographs of their somatic metaphase (also Mii in the case of P.veitchii) are shown in Plates 1-4, the karyo- type formulae, ranges of chromosome length and classification of karyotypes according to Steb- bins (1971) are shown in Table 5: the idiograms in Figs. 1-2, and the parameters of chromo- somes in Table 1-4.  The essential points are mentioned as follows:        (1)   Chromosomes of the various species in the section Modan have so far been examined and they are all diploid, the two species in the section Onaepia are also diploid, and thus tetraploids exist only in the section Paeonia.        (2)  Chromosomes in the genus Paeonia are relatively stable except for the differentiation of ploidy.  The karyotypes (Table 1-4) show no differences among different taxa in Sect. Modan and the same can also be said about the taxa in Sect. Paeonia (Table 1).  Not only are the karyotypes very similar, but also among the members within  either section have the same parameters of chromosomes, and, differences, if occur, are not statistically significant. Between the two sections, however, the situation is different. The arm ratios of the first pairs of chromosomes in Sect. Modan are 1.53, 1.52 and 1.48 (Table 1), but those in Sect. Paeonia are 1.12-1.28 (Table 2-4), 95% confidence limits are 1.46-1.60 for the section Modan and 1.07-1.28 (1.21-1.35 only for PB85078) for the section Paeonia, not overlapping, which indi- cates that the two sections have differentiated in respect of the first pairs of chromosomes.        (3)The population PB85024, which belongs to the P. obovata complex, has a karyotype of 2B (stebbins, 1971), which is a new one in the genus Paeonia. This karyotype is a stable one, for several individuals in the population are uniform in this respect, which shows that Steb- bins’ (1971) generalization that all the species in Paeonia have 2A does not hold true.        (4)  Three populations of P. obovata complex studied in this work from Sichuan and Shaanxi are all tetraploids, and one from Hebei is a diploid.  From the present work and the previcus reports, the materials from Japan and Korea, no matter whether flowers are pink or white, are diploids, those from Heilongjiang Province (with both pink and white flowers) (Liu Ming-yuan, personal communication) and from Heibei Province (with pink flowers) in China are also diploids, the one from Sakhalin (pink flowers) is tetraploid, those from Priamur of the Soviet Union are a tetraploid (with white flowers) and a diploid (with pink flowers), and those from Shaanxi (the Qinling Range) and western Sichuan (with both pink and white flowers) are all tetraploids.  As far as we have now known, ploidy in this parti- cular complex is correlated with the geographical distribution: diploids are found in the cen- tral part, tetraploids occur in the northern limits, and in the south  letraploids are the only cytotype.      (5)  The materials of P. mairei from western Sichuan and Shaanxi (the Qinling Range) are found all to be tetraploids, which shows that two cytotypes, diploid and tetraploid, exist in this  species,  but the geographical distribution pattern of these two cytotypes is to be revealed in the future investigation.  相似文献   

新疆的芍药属     

洪德元  潘开玉  李学禹 《中国科学院研究生院学报》1994,32(4):349-355

 The present paper deals with the genus Paeonia in Xinjiang, whose taxonomy has been confused. Based on the field observation, population sampling and the examination of herbarium specimens, a taxonomical revision is made in this paper.  Two species are recog- nized, i. e. Paeonia anomala L. and P. sinjiangensis K. Y. Pan. P. altaica K. M. Dai et T.  H.  Ying is reduced to P.  sinjiangensis and P.  hybrida (= P.  anomala var. intermedia) is reduced to P. anomala. The diagnostic characters of the two species are de- scribed and illustrated, and a map of their distribution in Xinjiang is presented. A key to these two species is provided here. 1. Roots straight, not thickened; sepals all caudate, less frequently one or very rarely two     non-caudate  ................................................  1. P. sinjiangensis K. Y. Pan. 2.  Roots fusiform or tuberous; inner three sepals non-caudate, less frequently one of them caudate  ..............................................................  2. P. anomala L. key words  Xinjiang; Paeonia; P. anomala; P. sinjiangensis; revision  相似文献   

让疼痛拐个弯     

查一路 《科学与文化》2005,(5):23-23

儿时，母亲因为子女众多，疾病、劳累、贫困和对生活的抱怨，让她的情绪无端烦躁。记得她常常用粗粗的荆条拍打我的双腿。我疼痛得大哭。本想用哭声引起她的怜悯，进而得到安慰，可是母亲锁上门出去了，我一个人被关在屋内。不知过了多久，哭声停止了，因为我发现泪水是咸的。我被泪水中的盐份吸引住了，开始用舌头舔嘴边的咸，舔干了嘴边，渐渐地，  相似文献   

论信息市场的宏观调控   总被引：1，自引：0，他引：1  

查先进 《情报科学》1994,15(5):1-4

宏观调控是现代市场经济的基本特征,信息市场的繁荣和发展也离不开国家的宏观调控。文章从分析信息市场的交易特点和运行环境出发,比较系统地论述了中国信息市场宏观调控的具体对策。  相似文献   

电子商务环境下退货逆向物流系统性能评价指标及实证研究     

倪明  查玉莹 《图书情报工作》2011,55(8):135-74

由于电子商务自身交易的局限性,会产生企业无法避免的退货问题。在分析电子商务环境下退货逆向物流产生的原因以及系统特征的基础上,从退货回收处理成本、时间以及服务三方面衡量电子商务环境下退货逆向物流系统的性能。通过实证研究,验证指标的实用性。  相似文献   

废水中硫酸盐生物处理原理与工艺     

胡日查  孙立波  蒋惠忠  金生威  刘秀 《科技通报》2011,27(6)

废水生物脱硫工艺成本低、效率高、污染少,且可以回收单质硫,具有较高的经济价值,因此受到污水处理领域的广泛关注。本文详细介绍了硫酸盐废水的生物处理技术,主要关注其处理原理,特别是功能菌—硫酸盐还原菌的种类和代谢途径,以及单相吹脱工艺、两相厌氧工艺、生物膜法工艺、硫酸盐还原与硫化物光合氧化联用工艺、微好氧工艺、两相厌氧与硫化物生物氧化联用工艺、同步脱氮除硫工艺等多种目前传统和新型生物脱硫工艺。  相似文献   

基于信息技术的多学科融合研究     

杨漾  查先进 《中国科技资源导刊》2011,43(1)

首先分析关键信息技术及其对学科交叉融合的影响,然后以中国知网为平台,搜集各关键信息技术的论文发布数量.在数据分析中,先结合关注度和融合度进行了基本的统计分析,再利用相关分析,对基于信息技术的多学科融合趋势进行探讨.  相似文献   

绿色创新型有机化学实验教学模式构建与实践     

查正根  兰泉  郑媛  刘晓红  汪志勇  郑小琦 《实验室研究与探索》2014,(3):136-141

国家级实验教学示范中心项目建设以来,基础有机化学实验室添置与教学、科研相适应的仪器设备,以绿色化学为导向,跟踪基础研究进展,关注科学热点、前沿,结合本校、本课题组基础研究,设计开设水相有机合成、纳米催化、C—H键官能化、不对称催化等创新型有机化学实验专题,实现学科交叉,创建自主、开放实验教学模式,培养学生设计、创新能力和绿色化学意识,使其成为领军、战略人才。  相似文献