环境管制政策的实施效果评价——以九龙江流域"限猪令"为例

环境管制一直是我国环境污染治理所采取的主要政策之一,对我国的环境保护起到了一定的积极作用,同时也存在一些弊端,致使其成效不甚显著甚至背离初始目标.在此情况下,如何评价环境管制政策绩效具有重要的理论和实际意义.本文以九龙江流域"限猪令"政策为例,选取政策目标实现度、主要环保指标实现、环保投入效益、公众参与及满意度四个方面...     

Research Advanced on Functions of Nutritional Regulation and Intestinal Barrier of Arginine

Arginine is one of the most important amino acids for animals,and participates in the synthesis and metabolism of many nutrients,plays a role in the development and function of the gastrointestinal tract.Intestinal barrier function is one of the most functions for intestine.The article will summarize the effect of arginine on intestinal barrier.It was explicated the influence on inteseinal immunity of Toll-like receptor.This research provided some references for further study of arginine regulation on animal production.     

MicroRNA研究概述

MicroRNA(miRNA)是一类真核生物内源性非编码的单链小分子RNA,长约21nt~23nt。越来越多的miRNA在动物细胞和植物组织中发现,这些成熟的小分子RNA是从具有发夹结构的前体miRNA(pre-miRNA)剪切出来,通过与靶mRNA分子互补结合而抑制蛋白翻译或导致mRNA降解,从而调控靶基因的表达。miRNA是一类重要的基因调控子,在机体的基因表达调控、细胞分化和凋亡以及抗病毒防御中发挥重要的作用。深入理解miRNA介导的宿主与病毒之间的相互调节作用,对于阐明病毒的致病机理与制定治疗策略具有深远的意义。     

Salvinia plants in trade: what species are we actually talking about?

Incorrect labelling of plants in trade and misidentification are widespread. Likewise, in trade numerous names are being used for the ornamental aquatic plant known as ‘Kariba weed’, but rarely the correct scientific name Salvinia molesta Mitch. For inspection services of EPPO member countries, correct identification of S. molesta has become important since the species was added to the EPPO A2 List and the List of Union concern in accordance with EU regulation 1143/2014 based on an EPPO Pest Risk Analysis (PRA) for the species. Inspections and a targetted survey of Salvinia plants in trade in the Netherlands were performed and additional material was obtained from wild sources in South Africa, Hungary and the United States. Specimen identification was verified by comparison with the herbarium collection at Naturalis Biodiversity Center in Leiden and with the sequences available in NCBI GenBank database. This paper provides the tools to correctly identity the relevant Salvinia species.     

种衣剂在小麦上的应用效果初报

就17%多·克·酮小麦种衣剂对幼苗生长的调控作用以及田间防治甘肃省小麦主要病害的实际应用效果进行了试验研究。盆栽试验结果表明，17%多·克·酮种衣剂安全的药种比为1:50，在此包衣比例下，不仅可提高出苗率，对植株生长无不良影响，而且能使植株根系活力显著增强，叶片叶绿素含量明显提高，生长后期抗倒伏能力增强；田间小区试验结果表明，对早期小麦条锈病的防效可达76.2%、小麦白粉病可达77.0%，对土传性小麦全蚀病的防效可达到82.1%，冬麦区小麦产量提高6.8%，春麦区小麦产量提高10.9%。     

多胺对甜瓜幼苗抗冷性的影响机理研究

本文研究了外源多胺对在低温胁迫下甜瓜幼苗体内DNA、RNA、可溶性蛋白质、超氧物歧化酶(SOD)及细胞质膜透性的影响.结果表明,多胺处理的甜瓜幼苗在低温(2±1℃)下处理10h后,RNA和DNA含量明显增多,蛋白质的图谱发生显著变化,SOD活性增强,细胞膜的破损渗漏较少,尤以0.4mmol的腐胺处理最为显著.多胺与核酸的相互作用调节了植物体内的代谢过程,与膜的相互作用增强了机体的抗冷性.     

Land Storage System: Effect, Problem and Its Legal Regulation

The authors suggest that the land storage system is beneficial not only to strengthen the country's macroscopic regulation of city land market, accelerate healthy development of city economy and increase the financial income, it can also be advantageous to carry out the economic reform and public facilities construction without a hitch. On the basis of this, in this paper, the increment of the land price and house price as well as the high risk of fund due to lack of related laws is analyzed. Corresponding legal regulations, such as polishing the legislation of land right, implementing the land utilization planning, reinforcing the legislation of city development, land requisition and countryside residential land administration are put forward.     

Harmonic Analysis and Suppression of High-frequency Welding Devices

This paper analyzes the structure and line current waveform of 3-phase AC voltage regulation circuit. As an application of 3-phase AC voltage regulation circuit, a high-frequency welding device's simulation model and harmonic analysis of line current are presented. Results of simulation are compared to field measurements. The two are in a good agreement, so this simulation model is correct. Two single-tuning filters and one second-order HPF are designed according to the device's harmonic condition. Simulation results of the circuit with filters indicate decrease of the harmonics in current of power supply, and the waveform is close to sinusoidal wave, which prove correctness of the solution to harmonics pollution.     

白云山水库调度管理系统

针对江西省吉安市白云山水库自建的局域网的特点，研制开发了水库调度管理系统软件。简要介绍在Power Builder平台上开发的水库调度管理系统软件中有关电力部分的主要功能和系统软件开发要点，重点介绍实现实时监控、报表制作等功能的关键技术，并介绍了四的技术关键。     

夏秋反季节莴苣的营养吸收规律初探

对夏秋反季节莴苣营养吸收规律的试验结果表明,莴苣的生物量随莴苣的生长进程逐渐增加。移栽45 d后干物质积累量占全生育期的80%以上;氮、磷、钾的吸收最高峰出现在移栽后的45~60 d,吸收强度分别达22.47 mg/株.d、8.01 mg/株.d和35.61 mg/株.d。