套袋对鸭梨果实香气及糖酸组分的影响

采用静态顶空和气相色谱-质谱联用技术、高效液相色谱技术,研究了生长期套袋对鸭梨果实挥发性成分、糖酸组分等风味物质的组成和含量的影响。结果表明:套袋导致鸭梨香气物质种类减少和相对百分含量降低。套袋鸭梨采收时测定的香气成分有3类18种,其中酯类15种、烯类2种、醇类1种;不套袋鸭梨采收时测定的香气成分有3类26种,其中酯类23种、烯类2种、醇类1种。鸭梨的主要香气成分是乙酸己酯、己酸乙酯、丁酸乙酯。套袋和不套袋鸭梨均检测到3种糖、4种有机酸组分,其中糖组分主要为果糖,其次为蔗糖、葡萄糖,有机酸组分主要为苹果酸,其次为乙酸、柠檬酸、草酸,但不同处理间含量存在差异。     

论反垄断法视野下国际并购行为的法律规制

随着经济全球化深入发展，资本流动的形式日趋多样化，国际并购即是这股资本流动浪潮中最为重要的一种形式。我国应在反垄断法相关规定的基础上，立足我国具体国情，借鉴欧盟、美国关于国际反垄断规制的先进经验，完善我国关于国际并购行为规制的反垄断法律体系，加强《反垄断法》在规制国际并购行为中的可操作性，实现国际并购行为的积极效应，促使我国经济实现可持续发展。     

Differential Cl−/Salt Tolerance and NaCl‐Induced Alternations of Tissue and Cellular Ion Fluxes in Glycine max,Glycine soja and their Hybrid Seedlings

The salt‐sensitive Glycine max N23674 cultivar, the salt‐born Glycine soja BB52 population, and their hybrid 4076 strain (F₅) selected for salt tolerance generation by generation were used as the experimental materials in this study. First, the effects of NaCl stress on seed germination, tissue damage, and time‐course ionic absorption and transportation were compared. When qualitatively compared with seed germination appearance in culture dishes, and tissue damages on roots or leaves of seedlings, or quantitatively compared with the relative salt injury rate, the inhibition on N23674 was all the most remarkable. After the exposure of 140 mm NaCl for 1 h, 4 h, 8 h, 12 h, 2 days and 4 days, the content of Cl^? gradually increased in the roots and leaves of seedlings of BB52, 4076 and 23674. Interestingly, the extents of the Cl^? rise in roots of the three experimental soybean materials were BB52 > 4076 > N23674, whereas those in leaves were just on the contrary. Secondly, by using the scanning ion‐selective electrode technique (SIET), fluxes of Na⁺ and Cl^? in roots and protoplasts isolated from roots and leaves were also investigated among the three experimental soybean materials. After 140 mm NaCl stress for 2, 4 and 6 days, and when compared with N23674, slighter net Cl^? influxes were observed in root tissue and protoplasts of roots and leaves of BB52 and 4076 seedlings, especially at the cellular protoplast level. The results indicate that with regard to the ionic effect of NaCl stress, Cl^? was the main determinant salt ion for salt tolerance in G. soja, G. max and their hybrid, and the difference in their Cl^?/salt tolerance is mainly attributed to the capacity of Cl^? restriction to the plant above‐ground parts such as leaves.     

浅谈给水排水工程节能节水措施

作者针对给排水系统工程特点并依据多年设计实践,总结了几点节能节水措施;阐明了通过减少不必要的浪费,可以达到节约水资源、节约能源的目的。     

水利建设可持续发展刍议

首先分析了水利建设与可持续发展的关系,即可持续发展对水利建设提出了新要求、丰富了新思路,水利建设实践推动了水利可持续发展研究,并基于此提出水利建设可持续发展思路,即树立可持续发展意识,推进水利建设制度创新;人水协调,加强水利现代化建设.     

基于微课的动物解剖与组织胚胎学翻转课堂教学模式探究

为了提高学生对动物解剖与组织胚胎学课程的学习效果,结合教学过程中积累的经验,将翻转课堂教学模式引入教学中,探究基于微课的动物解剖与组织胚胎学翻转课堂教学模式,提出具体实施方案及授课流程,在教学过程中进行初步应用,并评估该教学方法的有效性和可接受性。     

京郊边际土地纤维素类能源草规模化种植与管理技术

为探索能源植物在北京及周边地区的发展潜力,在京郊挖沙废弃地、荒滩地、撂荒地、污染农田4种边际土地上开展了柳枝稷、荻、芦竹和杂交狼尾草4种纤维素类能源草的规模化种植。在此基础上,总结提出了京郊边际土地纤维素类能源草规模化种植与管理技术,为基于边际土地发展京郊生物质原料生产与生物质能源产业奠定了良好的技术基础。     

浅谈二种生活用具在棉花自交与杂交中的应用

棉花在栽培过程中,为了获得好性状的棉珠,利用自交与杂交技术进行育种,本文论述小铁夹和吸汽水管方法的精髓及注意事项。     

温湿度对烤烟醇化过程中各化学成分的影响

从测定与烤烟醇化相关的指标物质入手,研究醇化库的温、湿度等条件对片烟醇化的影响。高温低湿(35℃70%)条件下既能保证烟叶含水量的安全,同时也促进了烟叶中物质的转化过程,加快了醇化进程,是本研究条件下最佳的醇化条件。