野生铁核桃树上的寄生草红外光谱考证

本文用傅里叶变换红外光谱仪测定了野生铁核桃树上的寄生草的红外光谱数据,与文献<参考文献原文>中的野生铁核桃叶和花的光谱图进行对比。初步得知, 野生铁核桃树上的寄生草的吸收峰与野生铁核桃叶和花的吸收峰较为接近。其结果为寄生草药效的说明及推广提供了重要的依据。     

温度胁迫对10种菊科杂草丙二醛和可溶性糖的影响

利用人工培养箱,人为地调节温度条件,研究了大蓟(Cirsium souliei)、加拿大飞蓬(Erigeron cana-densis L.)、清明菜(Herba Gnaphalii Affinis)、白蒿(Herba Artemisiae Scoparia)、苦荬菜(Ixeris chinesis(Thun b.)Nakal)、马兰(Baphicacanthus cusia)、天名精(Carpesium abrotanoides L.)、黄鹌菜(Youngia japonica(Linn.)DC.)、泥胡菜(Hemistepta lyrataBunge)和小蓟(Herba Cephalanoploris)等10种菊科杂草在不同温度胁迫强度下,其丙二醛和可溶性糖含量的变化.在温度胁迫下,10种菊科杂草体内丙二醛和可溶性糖都表现出积累的现象,尤其在4℃低温和44℃高温的积累明显高于常温24℃.积累的量随时间的延长而增加,但不同植物积累的程度也不尽相同,显示了不同杂草对温度抗性的反应强弱不同.     

A New Highly Oxygenated Eremophilenolide from Ligulariopsis shichuana

a new highly oxygenated eremophilenolide was isolated from Ligulariopsis shichuana. Its structure was elucidated by NMR spectroscopic and X-ray diffraction methods.     

除草剂对大豆田杂草防除效果的研究

本试验采用单因素随机区组设计土壤处理,研究了乙草胺、赛克、速收、扑草净、乙草胺 速收、乙草胺 赛克对大豆田杂草的防除效果.试验结果表明:乙草胺与赛克的适量混用对大豆田阔叶杂草与禾本科杂草的防效达85%以上,是很好的土壤处理除草剂.     

5%豆草特水剂肇东苜蓿田防除杂草试验研究

目的:探讨研究5%豆草特水剂三江平原土壤处理对肇东苜蓿田防除杂草药效试验,可得出5%豆草特水剂使用量和使用方法.方法:通过十八小区试验,药后15d、30d对残存杂草数量及鲜重进行调查.结果:5%豆草特水剂1500~1800ml/hm2土壤处理肇东苜蓿出苗和生长良好,对肇东苜蓿根瘤和产量没有影响.结论:肇东苜蓿田经试验最佳应用剂量为1500~1800ml/hm2,施药器械可以为人工和机动车载均匀喷雾,最适宜兑水量:450~600L/hm2.     

山东蓝刺头属(菊科)新记录植物——截叶蓝刺头

报道了山东菊科蓝刺头属新记录植物——截叶蓝刺头,对其外部形态、头状花序、基毛、总苞片、瘦果和冠毛进行了解剖观察,对其花粉形态、叶表皮及果皮微形态进行了实验研究。该种在以上形态特征方面与华东蓝刺头存在明显区别。     

三叶鬼针草化学成分的研究

对产于广西靖西的三叶鬼针草全草的化学成分进行研究,采用硅胶柱层析、重结晶等分离手段从中分离纯化得到12个化合物,通过现代波谱技术和理化常数测定鉴定了它们的结构,分别为:金丝桃苷(hyperin 1),香豆素(coumarin 2),水扬酸(salicylic acid 3),5,7-二羟基色原酮(5,7-dihydroxychromone 4),1-苯基-1,3,5-三庚炔(1-phenylhepta-1,3,5-triyne 5),苯甲酸(benzoic acid 6),豆甾醇(stigmastero 7),十六烷酸(palnitic acid 8),十四烷酸(octacosane 9),二十八烷烃(octacosane 10),β-谷甾醇(β-sitosterol 11),胡萝卜苷(daucosterol 12),其中化合物4 ～10为首次从该植物中分离得到.     

毛果红舌千里光化学成分研究Ⅰ

自毛果红舌毛里光中分得２个紫色结晶，经光谱解析鉴定为卟啉类化合物：Ｍｅｔｈｙｌ ｐｈａｅｏｐｈｏｒｄｉｄｅ－ａ和Ｍｅｔｈｙｌ ｐｈａｅｏｐｈｏｒｂｉｄｅ－ｂ。     

Nitrogen-15 Leaching Under Temporarily Weedy Maize

Abstract

In pot experiments the effect of a temporary infestation of maize by Chenopodium album L. on water and nitrogen leaching after a simulated strong rainfall was tested for a silty loam and a loamy sand. The results show that the leaching of ¹⁵N under the initial stage of maize can be reduced considerably by a temporarily weed infestation. Neither yield of maize nor uptake of nitrogen until corn maturity were reduced on both a silty loam and a loamy sand.     

Two new eremophilane Sesquiterpenoides from Ligularia dictyoneura

Abstract

Two new eremophilane sesquiterpenoides, 6α,9α-dihydroxyeremophilenolide (1), and 1β,10β-dihydroxyeremophilenolide (2), along with ten known eremophilane sesquiterpenoides (3–12) were isolated from the aerial parts of Ligularia dictyoneura (Franch.) Hand.-Mazz. Their structures were elucidated by means of extensive spectroscopic analysis. Compounds 3–6 were assessed for their cytotoxicity against five human cancer cell lines (HL-60, SMMC-7721, A-549, MCF-7 and SW-480), and the result showed that they had no activity.