Genetic improvement of New Zealand aquaculture species: programmes,progress and prospects     

MD Camara  JE Symonds 《新西兰海洋与淡水研究杂志》2014,48(3):466-491

Aquaculture, like terrestrial farming, cannot achieve economic and sustainable production without high performing genetic stocks tailored to the conditions under which they are grown. It is essential, therefore, that aquaculture investment includes genetics and biotechnology to adapt marine livestock to the novel conditions of intensive aquaculture and to the demanding markets into which they are sold. The return on investment in well-structured breeding programmes can be very high, and significant performance and economic gains have been demonstrated in multiple species. Many factors must be considered in designing a genetic improvement programme, including the reproductive biology of the species and the identification of realistic and commercially relevant breeding goals based on the resources and facilities available. This paper reviews the options available to aquaculturists and provides examples of how these are being applied to six aquaculture species in New Zealand: king salmon, hāpuku, kingfish, Greenshellp>TMp> mussels, Pacific oysters and pāua (abalone).  相似文献   

Zipf’s Law: A Viable Geological Paradigm?     

Daniel?F.?MerriamEmail author  Lawrence?J.?Drew  John?H.?Schuenemeyer 《Natural Resources Research》2004,13(4):265-271

Zipfp307r386/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0">s Law originally was proposed as a guide to a statistical distribution in social studies. The law describes a relationship between size and rank of discrete phenomena. It is a variant of Paretop307r386/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0">s 1927 Law known as the 80/20 rule and is similar to Bodep307r386/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0">s Law in concept. The relationship described by Zipfp307r386/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0">s Law is a succession of order data with the largest followed by half the size for the next largest, which in turn, the next is half that size, and so on. In geology, it has been used with moderate success in resource assessment of mining and petroleum. In essence, it predicts how many entities of a certain size may be left in a sequence of decreasing size assuming the largest has been ascertained. Examples of applications would be plotting the rank and size of ore deposits or oil fields to determine how many deposits remained undiscovered and their size. After a flurry of papers in the 1970s and 1980s, application of the law apparently either was successful and thus not reported in way the literature or was determined to be ineffectual and its use discontinued, but either way the law lapsed into obscurity. Examples of oil- and gas-field size in Kansas, the occurrence of historic earthquakes that affected the state, and size of anticlines (plains-type folds) are presented to illustrate application and limits of Zipfp307r386/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0">s Law.  相似文献   

The Phase Space Structure Around L4 in the Restricted Three-Body Problem     

Zsolt Sándor  Bálint Érdi  Christos Efthymiopoulos 《Celestial Mechanics and Dynamical Astronomy》2000,78(1-4):113-123

The phase space structure around L ₄ in the restricted three-body problem is investigated. The connection between the long period family emanating from L ₄ and the very complex structure of the stability region is shown by using the method of Poincarép04n21j0084q0103/xxlarge8217.gif" alt="rsquo" align="BASELINE" BORDER="0">s surface of section. The zero initial velocity stability region around L ₄ is determined by using a method based on the calculation of finite-time Lyapunov characteristic numbers. It is shown that the boundary of the stability region in the configuration space is formed by orbits suffering slow chaotic diffusion.  相似文献   

三氟乙酰对癸基苯为中性载体的碳酸根离子选择电极的制备和应用   总被引：1，自引：0，他引：1       下载免费PDF全文

钱国英  吴国梁 《盐湖研究》2001,9(2):51-55

实验比较了多种膜组分的性能 ,制得了有较长使用寿命的三氟乙酰对癸基苯为载体的 PVC膜碳酸根离子电极。适当增大膜中载体的含量 ,采用亲脂性强的增塑剂并加入适量增水性溶剂 ,有利于延长电极的使用寿命和增强抗亲脂性阴离子干扰的能力。已利用此种膜电极 ,以控制 p H标准比较法测定了模拟血清和质控血清中的碳酸根 ,并以已知稀释—标准加入法测定了碳酸盐型卤水中的碳酸根  相似文献   

一种知识型遥感图像光谱特征融合方法   总被引：1，自引：0，他引：1  

李勤爽  陈冬林 《测绘信息与工程》2001,(4):1-5

介绍了多源遥感图像融合的趋势，分析了其现状和层次，提出了一种基于光谱特性知识的光谱特征融合方案，并给出了部分实验结果。  相似文献   

某商住大厦基坑支护工程设计及施工技术   总被引：1，自引：0，他引：1  

刘艳霞  刘更宁 《中国煤田地质》2003,15(2):44-46

概述了某商住大厦基坑支护工程设计及施工技术,由于采用密排钻孔灌注桩加预应力锚索及冠梁腰梁挡土支护、外加旋喷止水注浆孔进行桩缝止水的组合支护结构作为基坑挡土防渗支护体系,基坑经受特大暴风雨没有发生任何问题,为类似工程的设计与施工提供了一种既安全可靠又经济实用的参考方案,与地下连续墙相比,经济效益可观。  相似文献   

Sequential inversion of local earthquake traveltimes and gravity anomaly—the example of the western Alps   总被引：1，自引：0，他引：1  

Philippe Vernant  Frédéric Masson  Roger Bayer  Anne Paul 《Geophysical Journal International》2002,150(1):79-90

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多母体p—范极大似然平差   总被引：2，自引：0，他引：2  

於宗俦  孙海燕 《测绘学报》1997,26(1):42-46

本文提出了多母体ｐ－范极大似然平差方法，建立了该方法的数学模型，并且导出了求解参数估值的基础方程，本文提出的方法溶测量平差，误差母体分布的估计、方差分量估计于一体，是对多元ｐ－范极大似然平差的进一步推广。  相似文献   

p-范分布的统计特性     

王文祥 《武汉大学学报(信息科学版)》1998,(3)

本文利用特征函数,得到了ｐ－范分布的几条重要性质。  相似文献   

氯化十六烷基吡啶-Triton X-100-对乙酰基偶氮氯膦光度法测定矿石中的微量钍   总被引：2，自引：0，他引：2  

潘教麦  郑静  陈骏 《岩矿测试》1998,17(1):37-39

研究了在氯化十六烷基吡啶（ＣＰＣ）和ＴｒｉｔｏｎＸ＿１００存在下,钍＿对乙酰基偶氮氯膦（ＣＰＡｐＡ）显色体系。在１２ｍｏｌ／ＬＨＣｌ介质中,ＣＰＣ可增敏钍与ＣＰＡｐＡ的显色反应,且能在一定程度上掩蔽稀土和铀。该体系在６８０ｎｍ处的摩尔吸光系数为１２０×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。钍量在０～０６ｍｇ／Ｌ内符合比尔定律,大多数共存离子对测定无影响。方法已用于测定稀土和铀存在下的矿石管理样中的微量钍,结果与原结果相符。  相似文献