印产毛喉鞘蕊花的引种栽培研究

本文报道印产毛喉鞘蕊花肉质根稳定性状的分离及栽培技术路线．肉质根株提纯到９９．５％;求得了露地最佳效益种植法,最优水平搭配是：３０ｄ、１５株／ｍ２、高垄、覆膜、底肥、整枝、去花穗,产鲜根８７００ｋｇ／ｈｍ２．     

不同育秧方式和插植密度下晚籼稻群体动态结构的研究

不同育秧方式和插植密度下晚籼稻群体动态结构存在差异。旱育秧群体分蘖速度快,分蘖能力强。稀植可促进个体分蘖多发、有效穗数增多,但旱育稀植并无分蘖早发的优势。旱育稀植使主茎基部叶片变短而上部叶片变长,生育后期叶面积消长平稳,地上部干物质积累较多。旱育秧、稀植都使主茎叶总数增多,全生育期延长。     

提高CO2浓度对两种亚热带树苗生物量及叶片特性的影响

 广东鼎湖山季风常绿阔叶林的主要优势乔木树种荷木和黧蒴幼苗生长于自然光照和人工调节CO2浓度为500±50μl·L-1或空气CO2(350μl·L-1)的气罩中3个月。高CO2浓度下生长的黧蒴和荷木植株总干物质量分别增加26.6％和16.6%,根部增加量最大,地上部分所占的比例降低,根冠比上升,基径增大而株高降低。高CO2浓度下生长的叶片密度及比叶重增加,叶肉细胞间隙体积减少。单位干重的黧蒴叶片可溶性糖含量、全碳、磷、钾含量在高CO2浓度下稍为下降,果糖、葡萄糖、蔗糖、全氮、镁含量及N/C比明显降低。而全钙含量无明显变化。     

Construction of an adenovirus type 7a E1A- vector.

A strategy for constructing replication-defective adenovirus vectors from non-subgroup C viruses has been successfully demonstrated with adenovirus type 7 strain a (Ad7a) as the prototype. An E1A-deleted Ad7a reporter virus expressing the chloramphenicol acetyltransferase (CAT) gene from the cytomegalovirus promoter enhancer was constructed with DNA fragments isolated from Ad7a, an Ad7a recombination reporter plasmid, and the 293 cell line. The Ad7a-CAT virus particle transduces A549 cells as efficiently as Ad5-based vectors. Intravenous infections in a murine model indicate that the Ad7a-CAT virus infects a variety of tissues, with maximal levels of CAT gene expression found in the liver. The duration of Ad7a-CAT transgene expression in the liver was maximally maintained 2 weeks postinfection, with a decline to baseline activity by the week 4 postinfection. Ad7a-CAT represents the first example of a non-subgroup C E1A- adenovirus gene transfer vector.     

A greenhouse assay to screen sunflower for resistance to Alternaria helianthi

A greenhouse assay to screen sunflower for resistance to Alternaria helianthi is described. A comparison of conditions led to the following standard conditions being recommended. The first or second pair of leaves of seedling plants at the V8 growth stage are inoculated using inoculum grown on sunflower leaf extract agar for 5–10 days at an inoculum density of 1–2 spores cm² of leaf tissue. A 48 h dew period should be applied to plants covered by a plastic tent. A dew period temperature of 26/26°C night/day and a post-dew period temperature relative to that experienced under local growing conditions should be applied. Lesions are measured 7 days after inoculation, and mean lesion size per plant is calculated. Mean lesion size of lines being tested is expressed as a proportion of the mean lesion size of a susceptible standard included in each screening experiment.     

喀喇昆仑、昆仑山地区植物元素含量的区域分异和数量分析

对喀喇昆仑、昆仑山地区87种植物21个元素含量及区域分异的研究表明,Ca、Cr、Cd、Fe、V含量比高等植物含量偏高,Ph、P的含量偏低。同种植物在不同地点元素含量有差异。盐柴荒漠植物中Na、K、Mg、P含量较高;高山草甸、冰缘植被植物Ba、Ca、Fe、V、Ti含量较高。各植被类型植物元素含量Na/K差异最大,Ca/Mg较小,Fe/Al差异最小。其变异系数分别为153.5、20.5和15.9.%     

Regulation of autoimmune response to mouse thyroglobulin: influence of H-2D-end genes.

Studies were initiated to define the H-2-linked genetic control of response to self-determinants of MTg. In addition to the Ir gene control of H-2K end, a modifying effect of D end was seen. The extent of regulation depended upon the derivation of the K-end Ir-Tg gene(s) as well as the D-end genes. When the Ir-Tg gene was from good responder H-2k and H-Ss strains, and the H-2D-end gene from the d allele, antibody levels were moderate to high but cellular infiltration was significantly reduced. These findings demonstrate genetic interaction between I-region and D-end gene products in the response to a self-antigen, MTg.     

Genetic control of the primary humoral response to Glu56Lys35Phe9

The primary humoral responses of mice to the linear random terpolymerl-Glu⁵⁶-l-Lys³⁵-l-Phe⁹ (GLø) were studied, utilizing the Farr antigen-binding technique and a new hemagglutination assay. This new hemagglutinin assay was easier and more convenient than the conventional Farr method, and was more sensitive in detecting early IgM responses. Following primary immunization, the majority of antibodies produced by responder strains were 2-ME-sensitive. These 2-ME-sensitive antibodies chromatographed at the same relative position as IgM on a Sepharose 6B column. On the other hand, no antibodies of either the IgM or IgG class could be detected in nonresponder strains. These data are consistent with the hypothesis that two complementingIr genes are required for the primary IgM response to GLø, in contrast to findings previously reported for (T,G)-A — L, anotherH-2-linked, complementing,Ir gene system. The implications of these differences are discussed.     

肺心病患者血清甲状腺激素的变化

本文分析30例慢性肺心病心衰并呼衰患者(心衰并呼衰组)及30例慢性肺心病心衰无呼衰患者(心衰无呼哀组)和慢性肺心病死亡组的血清甲状腺激素水平。结果表明心衰并呼衰组T_3、T_4水平均值显著低于心衰无呼衰组和健康组,心衰无呼衰组T_3水平均值显著低于健康组,肺心病死亡组T_3、T_4水平均值显著低于存活组,并发现血清T_3、T_4水平与动脉血氧分压(PaO_2)呈正相关。作者认为T_3明显降低是重症肺心病的损伤性结果,预示病情严重,预后差。而T_4明显下降,可能是死亡的信号之一。     

固定化葡萄糖异构酶最适pH值的调节

用多孔强碱性三乙醇胺基聚苯乙烯树脂作为载体,用CNBr与载体上多羟基作用共价偶联葡萄糖异构酶(GI)。最适偶联条件表明:CNBr量增多,蛋白载量增加,但比活下降。固定化葡萄糖异构酶(IGI)最适反应温度比天然酶提高15℃。并系统地研究了影响IGI活力-pH的曲线的各种因素:用具有不同平均孔径的载体(R=137A,185A,230A,365A)固定化GI,在低离子强度条件下(0.0064mol/L),测定其最适pH值分别7.76,7.56,7.50,8.20。选择平均孔径为230A且具有不同数量三乙醇胺基的载体(0.94,1.05,1.13,1.37mmol/g干胶)分别固定化GI,其最适pH值分别为7.70,7.50,7.46,7.36。