海水鱼类病原弧菌对对虾的致病力及其疫苗的免疫预防   总被引：8，自引：1，他引：8  

陶保华  胡超群  任春华 《热带海洋学报》2001,20(4):68-73

鱼类致病弧菌（溶藻弧菌Vibrio alginolyticus, 创伤弧菌V.vulnificus，河弧菌生物Ⅰ型V.fluvialis Ⅰ，鳗弧菌Ⅴ.anguillarum和副溶血弧菌Ⅴ.parahaemolyticus）同样可使斑节对虾Penaeus monodon患病，现对斑节对虾的致病性和免疫保护力作了研究。通过肌肉注射感染实验，发现5种弧菌对斑节对虾均有不同的致病作用。从5种弧菌中筛选出强毒株，以其制成福尔马林灭活疫苗。通过注射、浸浴和投喂等3种方式接种的斑节对虾，除投喂效果不明显外，注射和浸浴接种均有一定的免疫保护力。在注射接种组中，随着疫苗浓度的提高，其免疫力有升高的趋势。说明在鱼虾的弧菌病中，疫苗能起到共同的防御效果，为商用鱼虾疫苗的生产提供了可能。  相似文献   

中国对虾(PENAEUS CHINENSIS)血细胞超微结构、分类及计数   总被引：11，自引：1，他引：11  

叶燕玲  陈宽智 《中国海洋大学学报(自然科学版)》1993,(2)

研究中国对虾循环血细胞的超微结构、分类和计数。血细胞分成三类:(1)透明细胞,不含电子致密颗粒;(2)小颗粒细胞,含小的电子致密颗粒;(3)大颗粒细胞,含大的电子致密颗粒。循环血细胞总量平均值为10320个细胞/mm~3。透明细胞、小颗粒细胞和大颗粒细胞等分别占循环血细胞总量的25.32％、61.79％和12.89％。  相似文献   

单斜角闪石的X-射线粉晶法鉴定          下载免费PDF全文

宋仁奎  应育浦  李哲 《地质科学》1992,(4):394

 从140个已知成分的角闲石的晶胞参数作图,发现在β-v₀图上不同种属的角闪石有各自的分布区,克服了前人用β-d₁₀₀图难以喹定角闪石种属的困难。  相似文献   

基于资源限制性人工免疫系统的多光谱遥感影像分类方法   总被引：1，自引：0，他引：1  

钟燕飞  张良培  龚健雅  李平湘 《武汉大学学报(信息科学版)》2006,31(1):47-50

提出了一种基于资源限制性人工免疫系统（resouree limited artificial immune systems, RLAIS ）的多光谱遥感影像分类方法。该方法采用RLAIS对遥感影像分类中选取的感兴趣样区进行样本训练，得到全局聚类中心，利用聚类中心对遥感影像进行分类。实验证明，该方法在分类精度上优于传统方法，其总精度和Kappa系数分别达到了91%和0．88，具有实用价值。  相似文献   

免疫算法及其在测量数据处理中的应用     

王新洲  许承权 《武汉大学学报(信息科学版)》2006,31(10):887-890

介绍了免疫算法的发展概况，论述了基于克隆选择的免疫算法的基本原理、解算步骤等；并将其应用于测量数据处理领域，通过实例分析了免疫算法在测量数据处理中应用的可行性和优点。  相似文献   

乌鲁木齐国际机场2001年5月11日强沙暴天气分析     

张利平  王春红  胡建军 《气象》2003,29(6):46-49

从天气形势、天气特点、卫星云图、雷达回波等方面对乌鲁木齐国际机场2001年5月11日发生的强沙尘暴天气进行了分析。结果表明，这是一次由冷锋尾部前方产生的对流云团触发的强沙尘暴天气，该对流云团具有超级雷暴单体的性质。  相似文献   

Polyatomic Interferences Produced by Macroelements During Direct Multi-Elemental ICP-MS Hydrochemical Analysis     

Vladimir N. Epov  Dominic Lariviere  Ekaterina N. Epova  R. Douglas Evans 《Geostandards and Geoanalytical Research》2004,28(2):213-224

An experimental study of the interferences produced by macroelements (Na, K, Ca, Mg, Sr, S, Cl, Si, N and C) contained in natural waters during inductively coupled plasma-mass spectrometry (ICP-MS) is presented. The most significant interferences created by these elements were found to be SO, CO, CAr, SiH, SiO, NaH, NaAr, MgAr, CaO, KO and KAr, the magnitude of which was dependant on the concentration of each macroelement. To reduce these interferences, different approaches, for example, desolvating nebulisation, high resolution and dynamic reaction cell ICP-MS were applied and compared. All three approaches were found to be useful tools for significantly reducing various polyatomic interferences. Advantages and disadvantages for each approach are discussed.  相似文献   

Improvement in the interpretation of stress measurements by use of the overcoring method: development of a new approach     

K. Fouial  M. Alheib  H. Baroudi  C. Trentsaux 《Engineering Geology》1998,49(3-4):239-252

Determination of the state of the initial stresses in a rock formation is still one of the most important and complex problems in geotechnics. The over-coring method of measuring the stresses is one of the measurement methods most frequently used in geotechnics. It has been shown to be highly suitable for measuring the stresses in “hard and sound” rocks. However, applied to rocks which have a partialy elastic behaviour the method comes up against many problems the biggest of which are: (1) the non-elastic behaviour of the rock; and (2) the presence of natural fractures or those caused by the overcoring operation. These problems make it impossible to obtain correct deformation measurements which can be interpreted in terms of stresses. To overcome these problems, a new method has been developed based on the use of the deformations recorded at the start of the overcoring tests this method is the subject of the present article.  相似文献   

Short‐term changes in the plan shape of a sandy beach in response to sheltering by a nearshore mud bank,Cayenne, French Guiana     

Edward J. Anthony  Antoine Gardel  Franck Dolique  Daniel Guiral 《地球表面变化过程与地形》2002,27(8):857-866

Montjoly is a headland‐bound embayed sandy beach in Cayenne, French Guiana, that shows long‐term plan shape equilibrium in spite of periodic changes in accretion and erosion that alternately affect either end of the beach. These changes are caused by mud banks that move alongshore from the Amazon. The mechanisms involved in changes in the plan shape of the beach in response to the passage of one of these mud banks were monitored between 1997 and 2000 from airborne video imagery and field work. The beach longshore drift to the northwest, driven by the incident easterly to northeasterly swell usually affecting this coast, became temporarily reversed as the mud bank, migrating from east to west, initially sheltered the southeastern end of the beach. The difference in exposure to waves engendered a negative wave height gradient alongshore towards the southeast, resulting in the setting up of a cell circulation and counter‐active longshore drift from the exposed northwestern sector to the southeast. Sand eroded from the exposed sector accumulated first in the southeastern, and then the central sectors of the beach. The effect of increasing beach sheltering by the mudbank moving west is highlighted on the videographs by an ‘arrested’ pattern of beach shoreline development. The videographs show hardly any changes in beach plan shape since January 1999, due to sheltering of the beach from wave attack by the mud bank. It is expected that the eroded sector will recover in the future as the mud bank passes, leading to re‐establishment of the northwesterly sand drift. This temporally phased bi‐directional drift within the confines of the bounding headlands results in a rare example of mud‐bank‐induced beach rotation, and probably explains the long‐term equilibrium plan shape of Montjoly beach. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

2001年河南两次强对流天气过程对比分析   总被引：4，自引：0，他引：4  

匡晓燕  席世平等 《河南气象》2002,(4):11-13

对2001年连续两次发生在河南省的以冰雹和雷雨大风等强对流天气为主的过程对比分析结果表明，在不同的天气背景下，强对流过程中的中尺度雷达回波系统不同，对应的灾害性天气的各类和影响范围也不相同。  相似文献