苯甲酸盐水剂防除金钟藤试验研究

在秋季,应用苯甲酸盐水剂对金钟藤进行挂瓶滴加的防除试验,结果表明:5%的苯甲酸盐水剂滴加24~36 h最经济有效,防除金钟藤效果达100%;用药量与金钟藤藤茎的直径成正比。在1~6 cm藤茎范围内,用药量在50~200 m l范围增减。     

合成丁香酸的新方法

以三甲氧基苯甲酸为原料，在催化条件下，与氢氧化钠或氢氧化钾作用，选择性脱掉一个甲基得到了香酸，产率可达85％－92％。本文讨论了各种反应条件的影响并介绍了丁香酸的公斤级制备方法。     

牛气膣性阴道炎并发子宫内膜炎的诊治

奶牛阴道疾病在兽医临床上较为常见,若不及时治疗可造成奶牛继发子宫内膜炎,使其长期不孕,最后淘汰,给养殖户带来严重的经济损失。子宫内膜炎是奶牛最常见的产科疾病。在我国每年造成的经济损失达亿元。据有关资料表明,世界各国患子宫内膜炎的奶牛约占不孕牛的60%～70%,严重影响奶牛的利用年限。近年来,笔者在对养殖户奶牛做人工     

苯甲酸对植物病原菌的离体抗菌活性研究

苯甲酸对植物病原菌的活性受pH值影响较大,通常在酸性条件下的活性较高。在pH=5条件下,苯甲酸对供试的8种植物病原真菌表现出不同程度的抑制活性,其中对黄瓜疫霉病菌和水稻纹枯病菌的活性相对较高,EC50分别为24.40μg/mL和62.65μg/mL,其次是水稻稻瘟病和番茄灰霉病菌,而对小麦赤霉病菌及苹果斑点落叶病菌的活性相对较差,对辣椒炭疽病菌和苹果腐烂病菌基本无活性;苯甲酸对稻瘟病菌的菌丝干重增加、孢子萌发和芽管伸长均有较高的抑制活性,但对产孢量无影响。     

二氢吡唑邻甲酰氨基苯甲酰胺衍生物的合成及杀虫活性

以邻氨基苯甲酸和4,5-二氢吡唑-5-甲酸为原料,制备得到苯并噁嗪酮,所得产物与取代胺作用制得8个结构新颖的二氢吡唑邻甲酰胺基苯甲酰胺类化合物,其结构用核磁共振氢谱和质谱进行了表征。生物活性试验结果表明,在500 mg/L质量浓度下,部分化合物对小菜蛾Plutella xylostella、苜蓿蚜Aphis medicaginis和稻飞虱Nilaparvata lugens的致死率达100%。     

松材线虫对黑松几个生理生化指标的影响

8～9年生黑松经4种处理(接种松材线虫、100μg苯甲酸水溶液处理、无菌水处理并环剥主干中部树皮以及单独无菌水处理)后,研究了其流脂量、蒸腾作用及叶部过氧化物酶同工酶的变化.结果显示,接种后12天,所有接虫株松脂分泌停止;接种后27天,接虫株蒸腾作用下降最明显,其平均蒸腾强度为0.0145ml·g     

植物的抗逆性初探

本文讲述了影响植物体抗逆性的多种因素以及稀土，多胺、脱落酸和水杨酸在植物体抗逆性中的作用和机理。     

Improvement of Plant Regeneration from Immature Embryos of Wheat Infected by Agrobacterium tumefaciens

Wheat, one of the most important food crops, has been extensively studied with respects to plant regeneration and transformation employing the immature embryos as recipient tissues. However, the transformed tissues often become severely necrotic after co-cultivation with Agrobacterium, which is one of the major obstacles in gone delivery. In this study, wheat varieties CB037, Kenong 199, Xinchun 9, Lunxuan 987, and Shi 4185 showed desirable culture potential or high infection ability in Agrobacterium-mediated transformation. Similarly, optimal regeneration conditions were determined by testing their ability to inhibit the cell necrosis and cell death phenotype. Two auxins of 2,4-dichlorophenoxyacetic acid(2,4-D) and 3,6-dichloro-o-anisic acid (dicamba) were evaluated for highly significant effect on both callus and plantlet production, although they were genotype-dependent in wheat. Substitution of 2,4-D by dicamba enhanced the growth and regeneration ability of callus from the immature embryos of most genotypes tested. The callus growth state couldn't be modified by adding antioxidants such as ascorbic acid, cysteine, and silver nitrate or organic additives such as thiamine HCl and asparagine to the media. On the contrary, the best tissue statement and plant regeneration was achieved by employing the media containing the simplest MS (Murashige and Skoog) components and dicamba without organic components and vitamins. Thereby, our results are thought to inhibit wheat cell necrosis effectively and suggested to be used for more wheat genotypes.     

不同药剂防治豆野螟田间药效试验

豆野螟是夏季豇豆重要害虫,发生量大、危害重,蛀食鲜豆荚后影响豆荚产量及其商品性,若防治不好常造成重大损失,因此豆野螟成为豇豆生产上的重点防治害虫。豆野螟成虫喜产卵于开放的鲜花     

磺胺类药物的使用方法及注意事项

磺胺类药物是合成的抑菌药，抗菌谱广，对大多数革兰氏阳性和许多革兰氏阴性细菌有效。但个别菌种的菌株可能对其耐药。磺胺类药物通过竞争性抑制叶酸代谢循环中的对氨基苯甲酸而抑制细菌性增殖。细菌对各种磺胺类药物的敏感性都相同，对1种磺胺类耐药意味着对所有的磺胺类药物耐药。