Trace element geochemical characteristics of plants and their influence on the remote-sensing spectral properties in the North Jiangsu oil field

This paper presents the contents of 17 kinds of trace elements in plant leaf samples collected from 4 sections in the North Jiangsu oil field, and the dada on their visible-near infrared spectra. By comparing the results of the inner and outer oil-gas remote-sensing anomaly areas, the plant trace element composition, and the enrichment characteristics and their influence on the plant spectral properties are described. The results indicated that the plant leaves had very strong enrichment ability toward some elements such as Mg, Ca, K, Na, Fe, Al, Mn, V, Zn and Cr. The plant leaves from the oil-gas abnormal areas were enriched in trace elements of the Fe-series, but depleted in alkali and alkali-earth metal elements. The plant trace elements had a strong influence on the "blue-shift' strength and the reflectance of visible bands. And the ratios between Fe, Co and K, Na, Cd, Cu, Ba are the effective remote-sensing oil-indicating factors of plant trace elements.     

Inheritance of resistance toHelicoverpa armigera of 3 kinds of transgenicBt strains available in upland cotton in China

There are 3 kinds of transgenicBt strains, Shanxi 94-24, Zhongxin 94, and R19, in upland cotton in China. Their transgenicBt insect-resistance cultivars or hybrids have been developed and grown by farmers. Genetic studies indicate that the resistance of the 3 transgenicBt cotton strains toHelicoverpa armigera is controlled by one pair of non-allelic dominant genes. Linkage relationship between the resistant genes of R19 and Shanxi 94-24 transgenicBt strains shows that they may be inserted in the same chromosome. F₁ hybrids crossed among the 3 strains show that high levels of protection from feeding damage are the same as that of their parents. Therefore, there is no co-suppression phenomenon in many transgenic plants. The results presented here afford a fundamental reliance in developing transgenicBt insect-resistant cultivars and exploiting the heterosis of hybrids in upland cotton.     

老岭自然保护区主要野生药用被子植物资源研究

对老岭自然保护区野生药用被子植物进行了初步调查研究 ,共有 35 3种 ,隶属 74科 ,2 2 0属。简要叙述了 30种重要野生药用被子植物的生境、功效、采挖方法及药材名称     

一种简便快捷的植物线粒体质粒DNA的提取方法

介绍了一种从植物材料中提取线粒体质粒DNA的方法,该方法不需要密度梯度离心和有机溶剂油提,整个提取过程可在较短时间内完成,该方法简便,快捷,效果好,对拷贝数低的线粒体质粒DNA得率高。     

蒙古高原10种蜜源植物花粉形态描述

利用扫描电子显微镜对蒙古高原１０种蜜源植物的花粉进行了观察和摄片,并对花粉的形态特征进行了描述。     

贵州喀斯特地区种子植物物种多样性受损现状及其对策

由于喀斯特地区生态环境的脆弱性加上人为活动的影响 ,使生境恶化现象尤为严重 ,对植物的生存和繁衍影响极大 ,使得贵州喀斯特地区种子植物物种多样性受到严重威胁。在对贵州喀斯特地区种子植物受威胁的现状及多样性特征进行研究的基础上 ,分析了其受损原因并提出了有关对策和措施     

甜瓜种苗克隆

以古拉巴、蜜翠、伊丽莎白,西莫洛托４个引进杂交种甜瓜和七宝甜瓜,小麦瓜,青皮绿肉、亭林雪瓜本地品种为材料,用其子叶为外植体进行培养,获得无性繁殖系,结果表明,杂交种的芽诱导率高于本地品种;在１４种激素配比组合中ＭＳ＋６－ＢＡ０．５ｍｇ／Ｌ＋ＩＡＡ０．０５ｍｇ／Ｌ培养基丛生芽诱导率最高,达７２％－７６％;ＭＳ＋６－ＢＡ０．２ｍｇ／Ｌ＋ＩＡＡ０．０５ｍｇ／Ｌ培养基最利于芽伸长;生根培养基为ＭＳ＋ＩＡＡ０．２ｍｇ／Ｌ＋ｎａａ０．５ｍｇ／Ｌ,平均每粒种子可获得的８棵再生植株。     

华夏植物区系的地理联系及其作用与地位

在简述华夏植物区系特征之后, 根据最新资料补充论述了华夏植物区系与澳洲、非洲、南美大陆和北美大陆区系之间联系的一些例证,并结合有花植物起源及植物区系区划研究的最新动态对华夏植物区系在世界区系中的作用与地位作了进一步探讨与明确.     

电站锅炉过热器再热器在线故障诊断系统的研制

介绍了电站锅炉过热器和再热器在线故障诊断系统的工作原理、系统组成及系统主要模块的实现方法,利用计算机运算来仿真过热器和再热器管子金属壁面温度,为判别管子局部超温提供依据,可提高大容量电站锅炉运行的安全可靠性。     

苔藓植物的药用研究进展

回顾了苔藓植物的药用研究历史,列出了其药用资源,叙述这一类群的各种次生代谢物质,阐述了有关药用苔藓植物的研究现状,讨论了其医药开发前景和可筛选的药物种类.苔藓植物是潜在的天然活性产物宝库,其次生代谢物中的萜类、黄酮类、脂肪酸和一些生物活性物质是药用苔藓植物的有效成分,其药理活性包括细胞毒、血管增压、强心、抗菌、抗凝血、降血脂、神经保护、肌肉松弛、释放过氧化物及酶抑制等多种作用.从苔藓植物中筛选抗菌、防腐、抗癌、防治心血管疾病、抗凝血和降血脂等药物具有广阔的前景.苔藓植物以其较强的疗效、广泛的应用和低廉的价格将成为大有潜力的药用植物资源.