饲料中添加激素类等药剂促进僵鳗生长及复壮的研究   总被引：2，自引：0，他引：2  

倪啸  蔡雯莹 《水产科学》1992,11(3):14-18

在工厂化、高密度、全人工控制的养鳗条件下,使用雌二醇、牛肝糜维生素、甲基睾丸素、强的松等药剂,可以显著地促进僵鳗的生长和复壮,在生产中可以取得较好的经济效益。同时,本试验对于露天止水式和水库网箱养鳗也有普遍的意义。  相似文献   

湖泊渔业资源开发的系统动力学模型研究     

倪汝凤  黄能耿 《齐鲁渔业》1997,14(1):19-22

采用灰色系统理论与国际先进的人工神经网络模拟相结合的先进技术，进行了太湖、濑湖和金鸡湖的渔业资源开发的系统动力学模型研究。认为控制捕涝强度是调空太湖针银鱼，梅鲚，白虾３个主要经济种群的关键因素，专家鉴定认为，本研究填补国内空白，居国内领先水平。  相似文献   

Molecular cloning of gonadotropin cDNA in sevenband grouper, Epinephelus septemfasciatus     

Ni Lar Shein  M. Takushima  M. Nagae  H. Chuda  K. Soyano 《Fish physiology and biochemistry》2003,28(1-4):107-108

The cDNA for glycoprotein hormone (GPH) α-subunit, β-subunits of the FSH (GtH I) and LH (GtH II) were isolated, cloned, and sequenced from sevenband grouper pituitary using RACE PCR. These results show that sevenband grouper has two different types of gonadotropins FSH (GtH I) and LH (GtH II), as other teleosts.  相似文献   

Study of the near-infrared transmission of woven fabrics based on statistical analysis     

Ni Wang  Zhaolin Liu  Chen Tang  Shuang Zhao  Meiwu Shi  Jianyong Yu 《Fibers and Polymers》2014,15(9):2013-2018

47 kinds of woven fabrics were prepared with different fibers, thicknesses, weights per square meter and percentage covers. Statistical analysis method was employed to study the influence of the material and structure parameters on near-infrared transmission of these fabrics. Firstly, the effect of materials on near-infrared transmittance was determined through the contingency table analysis. Then the parameters significantly influencing near-infrared transmittance were found out and correlations among them were discussed by direct correlation and partial correlation analysis. Finally, regression equation of the near-infrared transmittance was established using factor analysis and principal component extraction. Results show that materials have little influence on near-infrared transmittance of woven fabrics. However, thickness, weight per square meter and percentage cover of the fabrics are closely related to near-infrared transmittance. Because there are correlations among thickness, weight per square meter and percentage cover, two new factors are extracted to establish the regression equation. The equation has an error rate of less than 5 % and thus can predict near-infrared transmittance precisely.  相似文献   

Comparison of bending properties Co-woven-knitted and Multi-layered biaxial Weft-knitted fabric reinforced composites     

Yanhua Xu  Xinlin Yuan  Ni Wang  Zhaolin Liu 《Fibers and Polymers》2014,15(6):1288-1294

Co-woven-knitted (CWK) fabrics and multi-layered biaxial weft knitted (MBWK) fabrics were prepared using glass filaments as both the warp and weft yarns and high tenacity polyesters as the stitch yarns with the same stitch length. Then the polyethylene resin was injected into the fabrics by vacuum assisted resin transfer molding to produce composites. Specific bending stress-displacement curves in the course and wale directions of the CWK fabric reinforced composites and the MBWK fabric reinforced composites were analyzed and their bending properties were also compared. Results indicate that the initial segments of all the specific bending stress-displacement curves for the CWK and the MBWK fabric reinforced composites are linear; then the specific bending stresses decrease with the displacements in a wave-like manner until sample destruction. The CWK fabric reinforced composites show plastic failure in course and wale directions, while the MBWK fabric reinforced composites show first fragile failure then plastic failure in course direction and show plastic failure in wale direction. Bending properties in the course direction of the CWK and the MBWK fabric reinforced composites are different from those in their wale direction, respectively. The CWK fabric reinforced composites are of smaller anisotropy than the MBWK fabric reinforced composites. By designing the buckling and distribution of the warp and weft yarns, the axial properties difference can be shortened.  相似文献   

基于成本视角的水质水量双向调节生态补偿量研究     

强安丰  汪妮  雒少江  王中豪 《水土保持通报》2022,42(2):144-149

[目的]以黄河流域陕西片区为实例进行水质水量双向调节的生态补偿量研究,为解决黄河流域上下游生态权益分配矛盾,实现流域区域间公平发展提供理论依据。[方法]同时考虑成本、价值和奖惩3个方面,以基本补偿标准为基础,采用水质改良系数法和水量贡献度法,构建基于水质水量的补偿标准测算模型开展研究。[结果]黄河流域陕西片区生态补偿量的基本补偿标准为13.74亿元;基于水质、水量调节值分别为-5.66和6.84亿元;2018年陕西省获得生态补偿金额为14.92亿元。[结论]相比以往的测算模型,该模型的测算结果更符合实际情况,同时也更适应于外部环境要素的变化。  相似文献   

In Vitro Anti-Inflammatory Activity of Three Peptides Derived from the Byproduct of Rice Processing     

Qu  Tingmin  He  Shuwen  Ni  Ce  Wu  Ying  Xu  Zhou  Chen  Mao-Long  Li  Honghui  Cheng  Yunhui  Wen  Li 《Plant foods for human nutrition (Dordrecht, Netherlands)》2022,77(2):172-180

Plant Foods for Human Nutrition - Inflammation is a contributing factor to the initiation and progression of many diseases, and some food-derived biofunctional peptides show high anti-inflammatory...  相似文献   

高产共轭亚油酸乳酸菌的筛选及培养条件的确定     

甄妮  鹿保鑫 《黑龙江八一农垦大学学报》2014,26(6)

共轭亚油酸简称CLA,它作为人类身体健康不可或缺的一部分而备受关注。现以7种乳酸菌为研究对象,采用紫外检测法测定发酵液中共轭亚油酸产量。对共轭亚油酸高产菌株进行筛选,实验发现德式乳杆菌的产量最高,产量达到了0.055 mg·m L-1。同时对最佳培养条件进行了全面研究,确定了菌株的最优工艺条件为培养温度36℃、p H 7、培养时间42 h。  相似文献   

芝麻单株产量及其构成因素与主要农艺性状的关系     

郑磊  张仙美  吴鹤敏  刘立峰  邵艳芳 《山东农业科学》2014,(11):22-25

利用相关性和灰色关联分析方法,对芝麻单株产量及其构成因素与主要农艺性状的关系进行了研究。结果表明:株蒴数是单株产量的最主要决定因素;有效蒴、果轴长、果节数是单株产量及其构成要素联系紧密的农艺性状;现蕾期、成熟期是单株产量及其构成要素联系紧密的生育期因素。因此在新品种选育上应注重现蕾开花早、生育期长、果轴长、果节数多、单株蒴果多特别是有效蒴果多的品系。  相似文献   

2013年广东省花生品种区域试验   总被引：1，自引：0，他引：1  

李少雄  钟旎  刘士亚  胡学应  温世杰  梁炫强 《广东农业科学》2014,41(17):17-20

2013年广东省花生品种区域试验由广东省种子管理总站、广东省农作物技术推广总站组织指导,广东省农科院作物研究所主持实施.共有10个新品种参试,设汕油523为对照种,全省共10个试验点承担本年度试验.10个参试品种有7个品种比对照种汕油523增产,3个品种比对照种减产.其中,汕油诱1号、仲恺花44、汕油辐1号、仲恺花99、粤油18、粤油390比对照种增产均达到极显著水平,湛油53增产不显著,仲恺花332、粤油410两个品种减产未达显著水平,花育33号比对照种减产达到极显著水平.推荐粤油390、汕油辐1号、汕油诱1号和仲恺花99共4个品种参加广东省农作物品种审定.  相似文献