查询词典 f ratio

According to the prior research , a highly efficient ext raction method was modified1 High2concent ration and DNA 2f ree RNA could be attained by using CTAB/ Guanidine Thiocyanate ext racion buffer1The total RNA can reach 1.7～2.0 of the OD260/ OD280 ratio with the yield of more than 015mg per gram of f resh tissues1 The method is suitable for high2quailty total RNA ext raction in leaves , root s , corollas , seeds and developing fibers.

本研究在前人方法的基础上对快速提取棉花组织总RNA 的方法进行了探讨。利用改进的CTAB 异硫氰酸胍裂解缓冲液，获得的RNA完整性好，无 DNA 污染，含量高，每克鲜组织能提取015mg 总RNA ， OD260/ OD280比值均在117～210之间。

The experimental results showed that under the reaction temperature of 80℃,using catalyst 5 % of the mass of turpentine,reaction time of 10 h,turpentine:solvent:assistant:water of 1∶1∶1∶2,the conversion ratio of 90 %,the selection of α-Terpineol production was 64.96 %,and ΔHφf,g and Sφg were estimated as well...

实验结果表明，在反应温度80℃，催化剂用量为松节油质量的5%，反应时间10 h，松节油∶溶剂∶助剂∶水为1∶1∶1∶2时，其α-蒎烯的转化率为90%，生成α-松油醇的选择性为64.96%。并对α-蒎烯和松油醇理想气体的△Hfφ，g、Sgφ进行了估算，为今后的理论研究提供了数据支持。

Finally, the thesis will bring forward the strategies and suggestion of developing the industry, and as the following: firstly, enhance the well-bred breeding system of the main yellow-feather broiler as soon as possible from the inherit characteristics of broiler to Hong Kong; secondly, introduce advanced science and technology to reduce the ratio of feed consumed and meat and increase the economic benefit; thirdly, make the nutrition requirement of broiler standardization and the epidemic prevention system of poultry disease strengthen; fourthly, promote the enterprise to build the system of sincerity and trust to guarantee the quality of living chicken to Hong Kong; fifthly, make the management of veterinary medicine and quality supervising strengthen and forbid to use the contraband and unsanctified medicine and improve the system f rudimental medicine; sixthly, reinforce the hygiene and epidemic prevention in breeding room to improve the competition of living chicken in Hong Kong market; finally, introduce the system of HACCP, and carry out ISO9000 quality management system and ISO14000 environment management system, and adopt the advanced international way to manage the exported enterprises.

第八部分针对目前供港活鸡市场存在的问题，提出发展供港活鸡产业的策略和建议，包括：（1）从供港活鸡主要品种的遗传特性着手，尽快完善供港活鸡主要品种黄羽鸡的良种繁育体系；（2）引进先进的饲料科技技术降低料肉比以提高养禽经济效益；（3）规范肉食饲养的营养标准并加强禽病防疫体系的建设；（4）推动企业建立诚信制度，切实保供港活鸡产品的质量；（5）加强兽药管理和质量监管工作，禁止使用违禁药物和未被批准的药物并完善残留监控体系；（6）切实加强养殖场的卫生防疫工作，增强供港活鸡产品在香港市场的竞争力；（7）导入HACCP体系，尽可能推行ISO9000质量管理体系和ISO14000环境管理体系，以当前国际通行的先进方式管理禽肉出口企业。

The researches on the formation mechanism,influence factor and hazards of foam problem in activated sludge process have shown,that it is mainly caused by excess growth of Nocardia amarae,Nocardia pinensis,Microthrix parvicella and Actinomycetes and intently related to the circumstance factors such as the temperature,pH value,F/M ratio,the kinds of benthonic substances and the operating conditions of the activated sludge system.

摘 要：对国内外活性污泥法中产生泡沫的危害、机理及影响因素的研究结果表明：诺卡氏菌群(Nocardia amarae，Nocardia pinensis)，微丝菌，放线菌的过量增殖是泡沫产生的主要原因。

The results showed that the sex ratio of trees was 1 m 2 f, and the natural T. cuspidata tree was able to sexually reproduce for many years. Male trees had fecundity when the diameter at breast height ranged from 1.5 cm to 92 cm, while female trees had fecundity when the DBH from 9.5 cm to 68.1 cm. Male trees typically flowered at the age about 20 years earlier than female trees. The numbers of microstrobili were 3 times more than that of megastrobili, and only 1/10 megastrobili developed into seed. The numbers of strobili and seed were correlated with DBH, crown diameter and height of trees; however, no significant correlations were observed with other site factors. Numbers of strobili decreased from the upper to lower canopy layers, while the quantity of seed decreased from the middle, upper to lower canopy layers. Seed-setting rate increased from the upper to lower canopy layers. Numbers of strobili and seeds in different directions of the canopy were not uniform, but the differences weren't significant.

结果表明：现实东北红豆杉天然种群中，♀♂性比为1：2；天然东北红豆杉有性生殖持续时间长，雄株胸径在1.5~92cm，雌株胸径在9.5~68.1cm保持生殖状态，雄株较雌株早约20年进入花期；天然东北红豆杉小孢子叶球数量平均为大孢子叶球数量的3倍，大孢子叶球转化为果实的数量不足1/10，孢子叶球数量、结实数量与样株的胸径、冠幅、树高显著相关，与其他立地因子相关不显著；孢子叶球数量在冠层间的分布呈现由上至下的递减规律，而结实数量在冠层间沿中、上、下递减，结实率沿冠层自上而下递增；孢子叶球与结实数量在树冠不同朝向上也呈现出一定的特点，但总体上差异不显著。

There were no effect in general on viability of Trichogramma chilonis treated with 10,70,150 and 300 mGy 60 Co γ irradiation in eggs stage, but the 150 and 300 mGy irradiation treatment in pupae stage induced significantly alteration of sex ratio in favor of female adults in F 1 generation.

在卵期用 1 0、70、1 5 0和 30 0mGy60 Coγ射线处理，对赤眼蜂的生活力基本没有影响；而在蛹后期用 1 5 0mGy和 30 0mGy处理，导致了盟黄赤眼蜂F1代的雌雄比例显著提高。

Bidentis were studied by adopting indoor bioassay. The results showed that the volatile matter of F. bidentis had not allelopathy to four receptor plants. The eluviated matter inhibited seedling growth of cotton obviously, the inhibition ratio of root and stem were 6.29% and 10.42% respectively. The aqueous extract of litterfall and root exudates had different inhibition to four receptor plants, The synthesis effectof all treatments was significantly greater than eluviated matter treatment except for B3 of the aqueous extract of root exudates, such as the synthesis effect of all treatments (A1, A2, A3, B1, B2, B3 and eluviation) were 44.74, 29.37, 14.5, 31.54, 16.52, 3.55, 1.48 respectively.

结果显示：黄顶菊自然挥发物对受体植物不表现化感作用；黄顶菊淋溶物对棉花幼苗生长表现出明显的抑制作用，对棉花幼苗高度和根长的抑制率分别为6.29%和10.42%；黄顶菊枯落物浸提液和根系分泌物浸提液对4种受体植物均表现出不同程度的抑制作用，除了黄顶菊根系分泌物浸提液 B3处理外，其它处理的综合效应均显著大于淋溶物处理，如黄顶菊枯落物浸提液（ A1、 A2、 A3）、根系分泌物浸提液（ B1、 B2、 B3）以及淋溶物等各处理对受体植物的综合效应分别为44.74、29.37、14.5、31.54、16.52、3.55、1.48。

Corni. On the best coordination basis of 3 factors of extracting time, extracting temperature and solid-liquid ratio, the orthogonal combination of design of quadratic regression was tested by selecting 2 factors of alcohol amount and precipitation time, and optimization on technology parameters of polysaccharide extraction from F. Corni was conducted for two times.

方法］在山茱萸多糖提取时间、提取温度和料液比3个因素最佳配合的基础上，选取酒精用量、沉淀时间2个因素进行二次回归正交组合设计试验，用响应面法对山茱萸多糖提取工艺参数进行了两次优化。

One part was introduction research to figure out the basic hereditary expression of a serial of transitional color in light-yellow F.velutipes. The other aspect was research about the ratio of the copies of yellow monokaryons and white monokaryons in the light-yellow strains.

本实验分两部分，一方面初步研究了浅黄色金针菇的一系列过渡颜色的遗传表达基础，另一方面尝试了浅黄色菌株中黄色核和白色核拷贝数的比例的确定。

After comparing the time domain approach of estimating azimuth and slowness in the f-k method with the frequency domain, it is shown that the time domain approach actually is not less accurate or efficient than the improved frequency domain approach, and in the case of signal-to-noise ratio is very low, the results obtained from the time domain approach are more reliable.

进一步对在时域中直接估算信号方位角和慢度的一种算法进行了分析，比较发现时域方法的计算速度和精度都不低于频域方法，且在某些低信噪比的情况下，前者可以给出更可靠的结果。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。