Carp polyculture in Central and Eastern Europe, the Caucasus and Central Asia: a manual

This Technical Paper is a basic guide to carp pond polyculture practicable in the Central and Eastern Europe (CEE) and the Caucasus and Central Asia (CCA) countries. It provides an overview on the guiding principles, aspects and tasks, and presents the most applicable production techniques and patterns of carp polyculture. For further reading and more in-depth information on the suggested techniques and technologies, it also includes a list of relevant FAO publications. It is expected that this publication will help identify resources and contribute to the successful planning and realization of fish production by those fish pond owners and operators who need to strengthen and improve their knowledge on the subject.

β2受体遗传多态性与支气管哮喘患者肺功能关系研究

β_2肾上腺素受体（β_2AR）在哮喘患者中表现出遗传多态性。近年国外已对位点16及27进行了一些临床研究，但是所用基因分型方法不一，此外在中国人群这2个位点的多态性哮喘的关系至今仅有个别报道，我们采用所有样本测序方法，就其多态性与肺功能的关系进行初步探讨。

一种鸡胚胎心率记录的新方法

鸡胚胎是一种被广泛应用于发育生物学研究的实验材料。在以鸡胚胎为动物模型的各项研究工作 中, 心率常被看作是一个很重要的反应胚胎生理活动指标。本文详细介绍了一种侵入性的心电记录新方法, 在 正常的生理条件下通过记录鸡胚胎心电的变化来监测心率。首先在蛋壳上钻孔, 将电极插人蛋内, 然后通过放 大器放大, 板转换, 将心电信号输人电脑进行分析处理, 提取与心率相关的信息。这种记录方式对胚胎损 伤较小, 不影响胚胎的正常发育具有灵敏度高, 操作简单, 容易掌握等特点。

Centrifuge modelling of the response of buildings to tunnelling

The response of surface structures to tunnelling induced ground movements is an area of great importance for any urban tunnelling project. Testing described in this paper aims to investigate soil structure interaction effects by observing the response of aluminium beams of varying stiffness to tunnelling, using the 8 m diameter beam centrifuge at Cambridge University. Soil and structure displacements are extensively monitored through a photo imaging technique which enables a detailed analysis of the interaction behaviour. Results to date indicate that the relative structure-soil stiffness is the governing factor in determining how a structure will respond to tunnelling. This parameter is highly dependent on both the structure and soil stiffness. It is also shown that contrary to common assumptions in the literature, negligible axial strains are transferred into the structure. This paper outlines the results of the research to date. © 2010 Taylor & Francis Group, London.

选定因素下湿地基质释放氮的正交试验研究

通过正交试验考察了成熟湿地基质在选定的影响因素及水平下的氮释放量。结果表明,25℃下氨氮的平均释放量是15℃下的2.9倍,亚硝态氮及硝态氮的释放量在两温度下无显著差异;35℃下氨氮的平均释放量是15℃下的5.6倍,亚硝态氮和硝态氮的释放量较15℃时有明显增加。由于湿地基质中COD的释放,在试验设定的进水COD浓度水平(≤40 mg/L)下,COD含量难以对氮的释放产生显著影响。湿地基质对pH有较强的缓冲能力,试验设定的进水pH基本不会影响氮的释放。

稳定性二氧化氯的杀藻效果研究

中国科学院创新项目 (KSCX2- 1- 0 6B)资助

寄生虫对宿主种群的调节

淡水生态与生物技术国家重点实验室开放基金 (批准号 :2 0 0 1FB0 6)资助

A novel hydraulic microactuator sealed by surface tension

In order to improve the power density of microactuators, recent research focuses on the applicability of fluidic power at microscale. The main encountered difficulties in the development of small fluidic actuators are related to production tolerances and assembly requirements. Furthermore, these actuators tend to comprise highly three-dimensional parts, which are incompatible with traditional microproduction technologies. This paper presents accurate production and novel assembly techniques for the development of a hydraulic microactuator. In addition, a scalable low friction seal, relying on surface tension forces, is presented. A prototype piston-type microactuator with a bore of 1 mm and a length of 13 mm is developed. Using a gallium-based surface tension seal, pressures of more than 90 kPa have been sealed without leakage. © 2005 Elsevier B.V. All rights reserved.

环境因素对原生动物群落特征的影响

1999年 12月至 2 0 0 0年 11月 ,对华中科技大学华瑜池的原生动物群落进行了研究 ,共检出原生动物 12 5种 ,其中植鞭毛虫 19种 ,动鞭毛虫 2 8种 ,纤毛虫 6 4种 ,肉足虫 14种 .对原生动物群落结构和功能的研究表明 :1)自然条件下 ,PFU原生动物群落的种类组成数及原生动物群落的群集速度相对稳定 ;2 )自然条件下 ,PFU原生动物群落结构和功能不受季节变化的影响 ;3)当PFU原生动物群落受到外界胁迫时 ,不管这种胁迫来自物化因素或是生物因素 ,其群落结构和功能都会发生

红球藻研究进展

国家自然科学基金资助项目(39570086)

长江中华鲟繁殖群体资源现状的初步研究

根据1994—1998年获得的246尾标本,对中华鲟繁殖群体的性比、性腺发育成熟个体比例、年龄结构、体长和体重特征等进行了研究。并结合历史资料,对其种群资源现状进行评价,提出了相应的资源保护措施建议。

武汉东湖铜锈环棱螺种群变动和生产量的初步观察

本文报道了东湖环棱螺的种群密度、年龄结构、种群增长率和生物量、生产量、P/B系数及其在不同湖区中的季节变化;用指数生长模型计算种群增长率。以累计总增长的方法估算种群生产量。研究结果表明,水果湖区铜锈环棱螺年平均生物量为554.37克·米~(-2),累计生产量为604.99克·米~(-2)·年~(-1),P/B系数为1.09;郭郑湖区平均生物量为286.74克·米~(-2),生产量为308.99克·米~(-2)·年~(-1),P/B系数为1.08。本文还对影响铜锈环棱螺的种群变动和生产量的生态因子作了扼要的

Multi-walled carbon nanotube conductivity enhancement and band gap widening via rapid pulsed thermal annealing

Herein we report on the transport characteristics of rapid pulsed vacuum-arc thermally annealed, individual and network multi-walled carbon nanotubes. Substantially reduced defect densities (by at least an order of magnitude), measured by micro-Raman spectroscopy, and were achieved by partial reconstruction of the bamboo-type defects during thermal pulsing compared with more traditional single-pulse thermal annealing. Rapid pulsed annealed processed networks and individual multi-walled nanotubes showed a consistent increase in conductivity (of over a factor of five at room temperature), attributed to the reduced number density of resistive axial interfaces and, in the case of network samples, the possible formation of structural bonds between crossed nanotubes. Compared to the highly defective as-grown nanotubes, the pulsed annealed samples exhibited reduced temperature sensitivity in their transport characteristics signifying the dominance of scattering events from structural defects. Transport measurements in the annealed multi-walled nanotubes deviated from linear Ohmic, typically metallic, behavior to an increasingly semiconducting-like behavior attributed to thermally induced axial strains. Rapid pulsed annealed networks had an estimated band gap of 11.26 meV (as-grown; 6.17 meV), and this observed band gap enhancement was inherently more pronounced for individual nanotubes compared with the networks most likely attributed to mechanical pinning effect of the probing electrodes which possibly amplifies the strain induced band gap. In all instances the estimated room temperature band gaps increased by a factor of two. The gating performance of back-gated thin-film transistor structures verified that the observed weak semiconductivity (p-type) inferred from the transport characteristic at room temperature. © 2014 Copyright Taylor & Francis Group, LLC.