High-frequency Induction of Adventitious Shoots from Leaves of Robinia pseudoacacia by Thidiazuron

INTRODUCTION Black locust (Robinia pseudoacacia L.) is a nitrogen- fixing leguminous tree valuable for its agroforestry qualities (ornamental value, timber production, animal feed, and honey production). Moreover, its fast growing rate and potential for environmental amelioration have drawn attention to the species as one of the leading candidates for woody biomass plantations (Mitchell C P, 1988; Ranney J W, et al, 1988). The amenability of black locust to be regenerated by tissue cul…     

黄连叶、须、根对发热大耳兔、大鼠的药效学研究

为了比较黄连叶、须、根的浸膏、原粉对内毒素致大耳兔发热、酵母致大鼠发热模型的解热作用、将大耳兔和大鼠各分为9组,耳缘静脉注射内毒索致大耳兔发热,皮下注射酵母溶液致大鼠发热,致热后模型组一灌胃生理盐水,模型组二灌胃阿司匹林溶液,其余6组分别灌胃黄连叶、须、根的浸膏和原粉,记录给药后不同时间段大耳兔和大鼠的体温,描绘平均升温曲线。结果是黄连根的浸膏和原粉对发热大耳兔、大鼠的体温有极明显的降低作用(P<0.01).黄连须浸膏和原粉对发热大耳兔、大鼠的体温有较强的降低作用(P<0.05),黄连叶的浸膏和原粉对发热大耳兔、大鼠有降温作用,但没有达到显著水平,且浸膏组的降温效果好于对应的原粉组、表明黄连须对内毒素致大耳兔和酵母致大鼠发热模型的解热效果强于黄连叶,对于开发成中兽药具有一定的价值,而黄连叶不具有开发利用价值     

断奶仔猪圆环病毒2型与多杀性巴氏杆菌混合感染的诊断

<正>仔猪断奶后多系统衰竭综合征(PMWS)主要是由猪圆环病毒2型(PCV2)感染6⁸周龄仔猪所引起的一种以渐进性消瘦、黄疽、间质性肺炎及淋巴系统退化为主要症状的传染病8周龄仔猪所引起的一种以渐进性消瘦、黄疽、间质性肺炎及淋巴系统退化为主要症状的传染病^([1-3])。该病毒主要感染猪的免疫器官,造成免疫系统功能降低,该病发病症状与猪呼吸与繁殖障碍综合征病毒(PRRSV)、猪瘟病毒(CSFV)等病毒感染相似,且也易混合感染,此外,PMWS也常引起细菌继发混合     

环磷酞胺复制中老年男性雄激素部分 缺乏综合征大鼠模型的研究

〔摘要〕目的应用环磷酞胺复制中老年男性雄激素部分缺乏综合征的大鼠模型建立〔方法取20只大鼠随机 分为2组:正常组,模型组〔分别于造模前、造模后1d、造模后30 d观察大鼠一般情况、体质量、悬尾实验和强迫游 泳实验时间以及辜丸指数,放射免疫法测定各组造模前后血清1"1'' , FT水平,免疫组化法测定各组大鼠辜丸间质细 胞stAR蛋白平均灰度值,并进行统计分析〔结果与正常组比较,模型组大鼠悬尾实验时间延长,差异具有统计学意 义(P<0.01),强迫游泳实验时间缩短,差异具有统计学意义(P<0.01) ,血清1"1'' , FT水平、stAR蛋白平均灰度值均显著 升高,差异具有统计学意义(P<0.05、结论环磷酞胺造成的大鼠血清1"1'' , FT水平卜降,行为学改变的反辜丸组织退 行性变.基木类似PADAM模型、     

法国甘蔗分子生物技术研究进展

介绍了当前法国甘蔗分子生物技术所取得的最新进展，并阐述了目前正在进行的有关研究内容及其今后的发展方向。     

白菌僵分生孢子用于粉纹夜蛾幼虫的生物测定

本文记述了一种生物测定方法,能有效的用来测定昆虫病原真菌—白僵菌分生孢子制剂Beauveia bassiana(Bals)vuill,对取食用不同浓度的分生孢子表面处理叶盘上的粉纹夜蛾Trichoplusia ni(Hubner)一龄幼虫的毒力。48小时后,幼虫转移到未处理的半合成饲料上(温度25±1℃),五天后终止测定。这种生物测定的剂量—死亡率回归方程是:Y=2.1420 1.3352X。计算得出的致死浓度Lc20、Lc50和Lc80分别为每平方毫米上总分生孢子数32,139和590个。     

高粱产量及其它数量性状的遗传

1977年雨季在印度 Indore 进行的两个播期、两种肥力的随机区组试验(二次重复)中,种植 CSV_3、555(易感粒霉病)、IS9327IS9333、IS9530(轻感)、2219B、SPV29(中抗)及其全部可能组合成的 F_1。从单行小区内选取5株记载50%开花期、株高、单株籽粒     

全球氮肥供应及需求展望（上）

影响氮肥消耗的主要因素有:人口增长、减少贫穷与改善营养不良的需要、农产品增长、人类饮食的变化、全球地区经济福利状况、耕地与水的可利用性以及有助于平衡、完善植物营养的政策。肥料的利用会被天气、种子发育、农业耕作实践及耕作体系、技术应用、农耕专业知识、环境管理     

Magnetic property of loess strata recorded by Kansu profile in Tianshan Mountains

Kansu (KS) profile is located in the east of Yili basin, western Xinjiang, where typical loess sediments are distributed. The magnetic parameters (such as IRM, SIRM SOFT, and M) and grain size in the KS profile were analyzed in the study. The results showed that the magnetic property of KS loess is dominated by ferrimagnetic minerals, such as magnetite and maghemite. Antiferromagnetic and superparamagnetic minerals also exist in the profile, but had less impact on magnetic susceptibility. Compared with the typical loess sediments of the central Loess Plateau in China, the strata of Kansu profile contained more magnetic minerals and hard magnetic minerals. The analysis of grain size for magnetic minerals indicated that the properties of loess and paleosol were respectively dominated by PSD/MD and coarse SSD magnetite. The research found that the contents of magnetic minerals in loess and paleosol sequences in Kansu profile were similar, but the proportion of fine grained magnetite and soft magnetic minerals were varying, which implies a positive relationship between the value of magnetic susceptibility and intensity of pedogenesis.     

Experimental Investigation on the Aseismic Behavior of Seismic Damage Masonry Wall Retrofitted with Grouting and Steel Hoops

In order to accurately evaluate the aseismic behavior of the seismic damaged masonry pagodas destroyed by Wenchuan earthquake and strengthened after the earthquake, a test was conducted to acquire related parameters on seismic performance from the specimens made by masonry and retrofitted with grouting and steel hoops. Taking a seismic damaged ancient masonry pagoda in Sichuan as a case study, four kinds of primitive specimens are fabricated by simulating the conformation of the masonry pagoda. Then the primitive specimens are destroyed under cycle loads and the damaged specimens are repaired by grouting and steel hoops. Cycle controlling tests are conducted with the specimens and relevant data are acquired. Experimental results showed that grouting combined with steel hoops could improve the ductility and energy dissipation capacity of a seismic damage of brick masonry structure, but it do a little to improve the stiffness of a seismic damage structure. And the cracking load of the repaired masonry is much lower than the original undamaged structure.