125 resultados para 361
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报道云南盘ju属鱼类4新种: 多鳞盘juD. polylepis、长鳔盘juD. macrophysallidos、长体盘juD. elongatus和短鳔盘juD. brachyphysallidos。全模标本存中国科学院昆明动物研究所。图4参9
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本文采用一体式膜生物反应器(SMBR)-复合垂直流人工湿地(IVCW)组合工艺(SMBR-IVCW)系统,研究了该系统对复合废水的净化效果。结果表明,当系统进水为CODCr397~890mg.L-1、氨氮9.40~27.1mg.L-1、TP4.30~10.7mg.L-1、TN45.9~75.8mg.L-1的条件下,在SMBR和IVCW的水力负荷分别为1000L.d-1和375mm.d-1的最优工况下运行,系统CODCr、NH3-N、TN和TP的去除率分别为97.5%、99.0%、59.6%和65.2%;系
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试验鱼以投喂饲料的不同和是否注射抗原共分为10组,即免疫组:A、B、C、D、E组,免疫对照组:a、b、c、de、组,饲料对照组:A、a组。饲料试验组B、C、D、E、bc、、d、e组。其中,饲料对照组以豆粕和鱼粉为基础蛋白源,饲料试验组分别以双低菜籽粕和普通菜籽粕等氮替代对照组中50%(B、b;D、d)和100%(C、c;E、e)的豆粕蛋白,测定异育银鲫血液白细胞和头肾吞噬细胞的吞噬活性、血清溶菌酶活性、血清补体(C3,C4)含量、血清凝集抗体效价及免疫保护率。结果表明:从免疫后21 d开始,饲料试验组E、
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本文在确定流域洗涤剂的磷在水体磷负荷中所占的比重及贡献率的基础上 ,采用Thomoamn数学模型 ,对在实施洗涤剂禁限磷措施后 ,流域水质的响应进行预测 ,并评估洗涤剂禁限磷的环境效果 .水质预测结果表明 ,实行限、禁磷措施后 ,供水水质磷含量将从目前的 0 .2 4mg/L降至 0 .18mg/L ,磷负荷削减了 2 5 % ;如严格控制流域禽畜散养 ,削减非点源磷盐 6 0 % ,供水水质处于地面水Ⅱ类水质 (0 .1mg/L)标准临界水平
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中华鳖病毒(TSV)是从病鳖中分离到的一种病毒病原。经细胞培养和差异离心制备TSV抗原,肌注家兔获 TSV抗体(TSV-Ab),中和效价为 1:20。用 TSV-Ab进行双向免疫扩散和间接ELISA检测,被检样品有健康和病鳖组织匀浆液、TSV细胞培养液、提纯的TSV,以及鱼传染性胰脏坏死病毒(IPNV)、草鱼呼肠孤病毒(GCV)、鱼病毒性出血败血症病毒(VHSV)、鲤痘疮病毒(Carp pox virus)和斑节对虾杆状病毒(MBV)。检测结果显示:IPNV、GCV、VHSV、Carp pox virus
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初步讨论了富营养浅水湖泊的退化现象和造成退化的主要原因,对湖泊生态恢复的目标和对策等问题也作了探讨。以武汉东湖为例,提出以水源保护地为主要功能的富营养浅水湖泊的恢复和整体优化对策,即恢复沉水植被、建立控制面源污染的半自然的人工湿地生态系统、优化水产养殖结构和恢复湖泊生物多样性等。对生物操纵在长江中下游富营养浅水湖泊恢复中的作用也进行了讨论
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于1987-1989年对鱼腥藻7120质膜、类囊体膜和细胞壁进行分离纯化和基本的色素与蛋白质特性分析。采用机械性方法破碎细胞,以非连续蔗糖密度梯度离心分离纯化鱼腥藻7120营养细胞的质膜和类囊体膜,以TritonX-100处理方法获得细胞壁。色谱分析和电泳结果表明,其质膜、类囊体膜的色素和蛋白质特性与单细胞蓝藻相类似;Triton不溶细胞壁未发现可见光谱吸收,其两条主要蛋白带52KD和14KD均为精蛋白,并且14KD蛋白为肽聚糖层连结蛋白,细胞壁蛋白质全部对胰蛋白酶处理敏感,其上未发现“热修饰”蛋白。
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<正> 中国科学院青藏综合科学考察队于1966、1973—1976年在西藏全境采集了大量的水生生物标本,作者从中共观察到原生动物458种,其中肉足虫170种,纤毛虫288种。关于西藏原生动物的分类区系、地理分布、生态特点等已另有报道。本文仅对匣壳虫属Centropyxis中一新种、二新亚种进行描述。
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The growth and energy budget for F-2 'all-fish' growth hormone gene transgenic common carp Cyprinus carpio of two body sizes were investigated at 29.2 degrees C for 21 days. Specific growth rate, feed intake, feed efficiency, digestibility coefficients of dry matter and protein, gross energy intake (I-E), and the proportion of I-E utilized for heat production (H-E) were significantly higher in the transgenics than in the controls. The proportion of I-E directed to waste products [faecal energy (F-E) and excretory energy loss (Z(E) + U-E) where Z(E) is through the gills and U-E through the kidney], and the proportion of metabolizable energy (M-E) for recovered energy (R-E) were significantly lower in the transgenics than in the controls. The average energy budget equation of transgenic fish was as follows: 100 I-E = 19.3 F-E + 6.0 (Z(E) + U-E) + 45.2 H-E + 29.5 R-E or 100 M-E = 60.5 H-E + 39.5 R-E. The average energy budget equation of the controls was: 100 I-E = 25.2 F-E + 7.4 (Z(E) + U-E) + 35.5 H-E + 31.9 R-E or 100 M-E = 52.7 H-E + 47.3 R-E. These findings indicate that the high growth rate of 'all-fish' transgenic common carp relative to their non-transgenic counterparts was due to their increased feed intake, reduced lose of waste productions and improved feed efficiency. The benefit of the increased energy intake by transgenic fish, however, was diminished by their increased metabolism.
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Ancherythroculter nigrocauda is a cyprinid fish endemic to the upper reaches of the Yangtze River, which has been reported to have 2 or 3 chambers to its air bladder. Morphological studies showed no differences between individuals with different types of air bladder, but did demonstrate geographical differences from different sources. After the completion of the Three Gorges Dam, it was expected that the population of this species would decrease, but artificial breeding and stocking is under consideration to protect this species from extinction. In the present study, mtDNA cytochrome b gene sequences were determined and analyzed for A. nigrocauda samples of different morphotypes and sources to identify their genetic differentiations, and thereby guide plans for the artificial propagation and conservation of this species. Haplotype diversity index values (h) and nucleotide diversity values (pi) for all the populations were found to be high indicating their high level genetic diversity. An analysis of molecular variance identified no differentiation among the studied populations. Therefore, we suggested that the individuals of different morphological types and geographical sources belong to the same species. To maintain its high level genetic diversity, it mill he necessary to use large and diverse sources of parental fish for artificial reproduction.