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991.
中国海水养殖鱼类的病害及防治 总被引:1,自引:0,他引:1
综述了中国海水养殖鱼类的疾病种类,病原检测技术以及病害防治的研究成果,提出了海水养殖鱼类病害防治中应当重视的几个问题,以期为海水养殖鱼类的病害防治研究提供参考材料。 相似文献
992.
NA及LNQD随机变量列的几乎处处中心极限定理 总被引:4,自引:0,他引:4
本文在二阶矩存在的条件下,证明了NA及LNQD随机变量列的几乎处处中心极限定理,使主要结果成立,其中W为[0,1]上标准Brown运动。 相似文献
993.
本文配合KrF激光器的设计,对其动力学过程作了零维模拟计算,并与国内外实验结果进行了比较。通过模拟研究,对KrF激光器本征效率的提高、激光器对入射束流的要求以及对激光腔体的设计等都提出了很好的建议与简单实用的计算模式。 相似文献
994.
一种检测麻痹性贝毒的高效液相色谱法 总被引:2,自引:0,他引:2
提出了一种利用高效液相色谱法同时分析麻痹性贝毒GTX组分和NEO/dcSTX/STX组分的方法。本法仅使用了一种缓冲溶液作为流动相,在InertsilC8-3色谱柱(250mm×4.6mm,5μm)上,采用梯度改变乙腈在流动相中的比例和流速,一次进样可同时定性及定量待测试样中的上述全部毒素组分。该缓冲溶液为9.0mmol/L磷酸铵缓冲溶液(pH=7.2),含有2.8mmol/L的庚烷磺酸钠。色谱分离过程首先以纯水相缓冲溶液进行等度洗脱,在16.5~19min向流动相中梯度加入1.5%的乙腈,加速GTX3和GCX2的洗脱,以避免GTX2的色谱峰与乙腈的溶剂峰重叠,随后从19min开始加大流动相中乙腈的比例为8.5%,以缩短边缘组分的保留时间。荧光检测器的激发波长和发射波长分别设为330nm和390nm。用本方法分析染毒的华贵栉孔扇贝和近江牡蛎,证实了本方法对PSP毒素具有良好的分析测定效果。 相似文献
995.
996.
A novel sensitive and stable phenols amperometric biosensor, based on polyaniline–polyacrylonitrile composite matrix, was applied for determination of benzoic acid. The electrochemical biosensor functioning was based on the inhibition effect of benzoic acid on the biocatalytic activity of the polyphenol oxidase (PPO) to its substrate (catechol) in 0.1 M phosphate buffer solution (pH 6.5). A potential value of −50 mV versus SCE, and a constant catechol concentration of 20 μM were selective to carry out the amperometric inhibition measurement. The kinetic parameters Michaelis-Menten constant and maximum current (Imax) in the absence and in the presence of benzoic acid were also evaluated and the possible inhibition mechanism was deduced. The inhibiting action of benzoic acid on the polyphenol oxidase electrode was reversible and of the typical competitive type, with an apparent inhibition constant of 38 μM. This proposed biosensor detected levels of benzoic acid as low as 2 × 10−7 M in solution. In addition, the effects of temperature, pH value of solution on the inhibition and the interferences were investigated and discussed herein. Inhibition studies revealed that the proposed electrochemical biosensor was applicable for monitoring benzoic acid in real sample such as milk, yoghurt, sprite and cola. 相似文献
997.
998.
By using a chiral cinchona alkaloid-squaramide catalyst, a series of both enantiomers of novel amino-pyrimidine derivatives can be obtained in an enantioselective three-component one-pot Mannich reaction with high yields and excellent enantioselectivities. In addition, these chiral derivatives were found to exhibit higher antiviral activities against tobacco mosaic virus (TMV) in vivo than the commercial agent ningnanmycin. In particular, chiral compounds (R)-4b and (R)-4e showed excellent antiviral activity against TMV at a concentration of 500?μg/mL, with a curative activity of 56.8% and 55.2%, respectively, a protection activity of 69.1% and 67.1%, respectively, and an inactivation activity of 91.5% and 94.3%, respectively. These values are superior to those of the agent ningnanmycin (which has curative, protective, and inactivation activities of 52.9%, 62.8%, and 90.4%, respectively). The antiviral mechanisms and enhanced antiviral activities of these chiral derivatives are interesting subjects for future investigation. 相似文献
999.
Yingying Shi Ming Xiao Lijun Luo Yefei Zhang Shan Wang Yu Chen Yanju Long Lingxin Li Fengzhi Jiang 《Chemical Papers》2018,72(6):1327-1337
Bi2O3/BiFeO3 composite was successfully fabricated by a conventional sol–gel method and structural properties were characterized based on X-ray diffractometer, scanning electron microscope, transmission electron microscope, energy-dispersive X-ray analyzer, nitrogen adsorption–desorption measurement, and UV–visible diffuse reflectance spectroscopy. Bi2O3/BiFeO3 had a good absorption for visible light, which was benefit to photocatalytic activity. The highest degradation efficiency was obtained when the content of Bi2O3 in Bi2O3/BiFeO3 was 63.9%. Effect of experimental conditions was investigated, and the highest photocatalytic activity of Bi2O3/BiFeO3 was observed at photocatalyst dosage of 0.5 g/L, initial BPA concentration of 10 mg/L, and solution pH of 6.3. Bi2O3/BiFeO3 photocatalyst exhibited enhanced photocatalytic activity for BPA, and the reaction rate constant over Bi2O3/BiFeO3 composite was 2.23, 3.65, and 8.71 times higher than that of BiFeO3, Bi2O3 and commercial TiO2 (P25), respectively. Bi2O3/BiFeO3 showed high photocatalytic activity after three cycles, suggesting that it was a stable photocatalyst. The possible photocatalytic mechanism has been discussed on the basis of the theoretical calculation and the experimental results. The hydroxyl and superoxide radicals together with photogenerated holes played significant roles in the photocatalytic reaction. 相似文献
1000.