Research on the rapid inactivation of typical algae blooms by hydroxyl radical

以典型水华藻铜绿微囊藻、针杆藻和四尾栅藻为研究对象,利用大气压强电离放电高效生成的羟基自由基(·OH)对3种藻进行杀灭.采用荧光染色、流式细胞仪; 和光合活性等生物学方法,确定·OH杀灭的阈值浓度和时间,并观察细胞形态变化.结果表明,当混合藻中铜绿微囊藻、针杆藻和四尾栅藻的初始藻密度分别为1; 9.5*10~4、21.8*10~4和4.90*10~4cells/mL时,; ·OH杀灭的阈值浓度为1.07mg/L,致死时间为4.5s;形态观察结果表明,处理后各种藻的形态是完整的,无内溶质溢出.因此,采用·OH可实现高; 效快速杀灭水华藻,有效保障饮用水安全.Algae blooming in water sources breaks out increasingly and seriously; threatened the water supply safety. Bench scale tests were conducted to; study the effects of ·OH generated from strong ionization discharge and; high pressure water jet cavitation on cell density, cell integrity and; photosynthetic capacity of 3kinds of typical freshwater algae. Algae; species including Microcystis aeruginosa, Synedra sp., and Scenedesmus; quadricuauda were respectively prepared at concentrations of 19.5*10~4,; 21.8*10~4 and 4.90*10~4 cells/mL, and the cell integrity was assessed by; flow cytometry. Results suggested that the ·OH lethal threshold of the; algae was 1.07mg/L within the exposure time of 4.5s. The cell; morphological observation results showed that all the cells were; integral and no cytoplasm composition spilled. Hence, large-scale; production of ·OH is a novel method to inactive typical algae species; efficiently and to protect drinking water safety simultaneously.国家科技支撑计划资助项目; 国家重大科研仪器研制项

顺铂耳毒性小鼠模型的建立

【目的】建立一种可靠的、重复性好的顺铂耳毒性小鼠模型，为进一步从分子学和基因方面研究顺铂的耳毒性机制提供可能。【方法】20只听力正常的健康小鼠，随机平分为2组，A组小鼠先行200mg/kg呋塞米腹腔注射，1h后腹腔注射1.0mg/kg顺铂；B组小鼠先行200mg/kg呋塞米腹腔注射，1h后腹腔注射0.5mg/kg顺铂。6只同年龄小鼠做正常对照组。治疗后第10天所有小鼠行听觉脑干电反应（ABR）测听和畸变产物耳声发射（DPOAE）检查，之后取双侧耳蜗，分别行全耳蜗基底膜铺片和环氧树脂包埋半薄切片，观察内外毛细胞、血管纹和螺旋神经节细胞等的病变。【结果】2组小鼠治疗后各频率ABR平均听阈都提高，DPOAE值都降低，其中A组的ABR平均听阈显著提高，各频率振幅明显降低，高频区DPOAE消失；B组的ABR平均听阈稍提高，高频（16、20、32kHz）振幅轻度降低，低频（4、8、12kHz）振幅无变化，高频DPOAE稍下降，低频DPOAE无变化。全耳蜗基底膜铺片结果A组蜗底外毛细胞全部破坏，蜗尖大部分外毛细胞破坏；B组仅蜗底外毛细胞大部分被破坏，蜗尖外毛细胞形态和数目接近正常，两组内毛细胞均无明显减少。半薄切片结果显示A、B两组小鼠的耳蜗血管纹和螺旋神经节细胞的形态和数目都接近正常。【结论】1.0mg/kg顺铂联合200mg/kg呋塞米单次腹腔注射法可引起小鼠内耳组织显著损伤，主要表现为耳蜗外毛细胞损失

Anticorrosion Properties of Modified Nano-TiO_2 Films Prepared by Sol-Gel Method

应用溶胶-凝胶法和浸渍提拉技术在316l不锈钢表面分别制备TIO2纳米膜和 b-fE-CE改性的TIO2纳米膜. 采用场发射扫描电子显微镜(fE-SEM)、原子力显微镜(AfM)、拉曼光谱法和能量分散谱(EdS)对薄膜进行表征,通过电化学阻抗谱(EIS)和动电位阳极极化曲线的测试考察薄膜的耐蚀性及对不锈钢的保护性能. 结果表明:两种纳米薄膜均含锐钛矿型的TIO2纳米颗粒,纯TIO2纳米膜与改性后的纳米膜中颗粒直径分别约为15和10 nM. TIO2/316l不锈钢和 b-fE-CE-TIO2/316l不锈钢膜电极浸泡在0.5 MO.ll-1 nACl溶液后,后者的电化学反应电阻较大,动电位阳极极化曲线的稳定钝化区较宽,击穿电位更高,说明改性的纳米膜的耐蚀性及其保护性能更好.TiO2 and B-Fe-Ce-modified TiO2 films were synthesized on the surfaces of 316L stainless steel(316L SS) substrates using a sol-gel and dip-coating method.The properties of the films were characterized by field emission scanning electron microscopy,atomic force microscopy,Raman spectroscopy and energy dispersive spectrometry.The corrosion resistance of the films and their ability to protect stainless steel were investigated by electrochemical impedance spectroscopy and potentiodynamic polarization curves.Both TiO2 and B-Fe-Ce-modified TiO2 films were composed of anatase nanoparticles about 15 and 10 nm in diameter,respectively.Impedance spectra of the stainless steel substrates coated TiO2 films contained semicircles for capacitive reactance in 0.5 mol.L-1 NaCl solution,but the charge transfer resistance of the B-Fe-Ce-TiO2/316L SS electrode was higher than that of the TiO2/316L SS electrode.The potentiodynamic anodic polarization curve of the B-Fe-Ce-TiO2/316L SS electrode showed a larger stable passive region and a higher breakdown potential than the TiO2/316L SS electrode,indicating that the modified film had better corrosion resistance and protective properties for 316L SS.国家高技术研究发展计划项目(863)(2009AA03Z327);国家自然科学基金(21073151和21173177)资助---

Analysis on epidemiological charateristics of chlamydia trachomatis infection in Jiangsu Province,2006-2011

目的了解江苏省2006-2011年生殖道沙眼衣原体感染的流行病学特征,为制定防治生殖道沙眼衣原体感染的策略提供科学依据。方法收集2006-2011年江苏省通过中国疾病预防控制信息系统报告的生殖道沙眼衣原体感染病例资料,并对资料进行流行病学分析。结果 2006-2011年,江苏省生殖道沙眼衣原体感染发病率呈快速上升的趋势,2006年为0.12/10万,2011年为3.15/10万,发病率年均增长速度为92.23%;在报告的5 859例病例中,男女性别比为0.3∶1,各年生殖道沙眼衣原体感染男女性别差异有统计学意义;发病年龄主要集中在20~29岁年龄组,占50.96%;江苏省生殖道沙眼衣原体感染报告病例主要集中在苏南和苏中的较发达城市;主要以家庭及待业者和工人为主。结论江苏省生殖道沙眼衣原体感染发病率快速增长,应加强对生殖道沙眼衣原体的防治,以控制其感染的快速流行。江苏省医学重点人才(RC2011086);江苏省医学重点人才(RC2011087); 江苏省科技项目(Y201029

Pricing Lookback Option of Discrete Arithmetic Averaging Assets′Floating Striking Price in Models with Jumps

在标的资产价格遵循跳跃扩散过程的假设下,运用风险中性定价法和EdgEWOrTH级数逼近及条件期望等相关知识,推导出以离散算术平均资产为浮动执行价的回望买入期权的价格公式.When the underlying asset price follows the jump-diffuse process,we deduce the analyzing pricing formula of the lookback options of the discrete arithmetic averaging assets′floating striking price that utilizes the risk-neutral pricing method,Edgeworth series expansion,and the relevant knowledge of conditional expectation.国家自然科学基金(11071202

人体脂肪中二噁英的检测分析

二噁英（PCDD/Fs）作为剧毒的环境持久性有机污染物，越来越多的受到人们的关注。由于其脂溶性的特征，二噁英进入人体后容易在人体内富集累积，对人体健康造成不可逆的危害。论文采用同位素内标法，利用高分辨气相色谱 / 高分辨质谱仪检测人体脂肪中的二噁英的毒性当量质量浓度，通过索氏提取、硅胶柱和活性炭柱净化和上机分析等流程，检测出 5 个人体脂肪样本中二噁英的毒性当量质量浓度在 2.00 ～ 10.1 pg TEQ/g 之间。　</jats:p

支持快速范围搜索的公钥可搜索加密方案

近年来,云存储服务逐渐成为数据存储的主流方式,但同时也带来了数据隐私保护的挑战。公钥可搜索加密技术允许用户在加密数据上执行关键词搜索,而无需解密数据,从而在保护隐私的同时提供了数据检索的便利,因此得到了广泛应用。但目前大多数可搜索加密方案存在范围搜索效率低与难以抵御关键字猜测攻击的问题。为解决这一问题,利用0-1编码构造了一种支持高效范围搜索的公钥可搜索加密方案,并引入公钥认证使发送者与接收者两方协同加密,防止第三方构造有效密文与陷门,以保证方案的安全性。为提高搜索计算的效率,利用陷门搜索记录构建密文索引,对新旧陷门的搜索范围进行比较并结合密文索引,可减少需比对密文数量,从而实现快速搜索。安全分析表明,该方案可以抵御云服务器的关键字猜测攻击,实验结果表明,该方案的密文索引能有效提高密文搜索的效率。 In recent years, cloud storage services have gradually become the mainstream method for data storage, but they have also brought challenges to data privacy protection. Public Key Searchable Encryption technology allows users to perform keyword searches on encrypted data without decrypting it, thereby providing the convenience of data retrieval while protecting privacy, so that it has been widely used. However, most searchable encryption schemes currently suffer from low efficiency in range searches and vulnerability to keyword guessing attacks. To address this issue, this paper constructs a public-key searchable encryption scheme that supports efficient range searches using 0-1 encoding, and introduces public key authentication to enable collaborative encryption between sender and receiver, thus preventing third parties from constructing valid ciphertexts and trapdoors and ensuring the security of the scheme. To improve the efficiency of search computations, this paper constructs ciphertext indices using trapdoor search records, comparing the search ranges of new and old trapdoors and combining ciphertext indices to reduce the number of ciphertexts that need to be compared, thus achieving fast searches. Security analysis shows that this scheme can resist keyword guessing attacks from cloud servers, and experimental results demonstrate that the ciphertext indices of this scheme can effectively improve the efficiency of ciphertext searches. © 2024 Science Press. All rights reserved

碳纳米管或石墨烯超薄膜的制备方法

本发明涉及一种碳纳米管或石墨烯超薄膜的制备方法,该方法为:对碳纳米管或石墨烯材料分散液进行抽滤处理,令碳纳米管或石墨烯材料在滤膜上形成薄膜,至少将薄膜的表层与滤膜剥离,制得厚度在100nm以下的碳纳米管或石墨烯超薄膜。本发明实现了多种类型碳纳米管或具有石墨烯结构的化合物的组装,并且工艺简单、操作方便、产品成本低、重复性好、适合进行大规模工业化生产;同时,所制备的薄膜分布均一、面积大、且透光率高,可作为在制备化学和生物传感器、场效应晶体管、超级电容器、锂离子电池电极和太阳能电池电极等光电子器件的材料广泛应用。&nbsp;&nbsp;&nbsp;&nbsp

基于Compact FieldPoint模块的气敏传感器阵列自动测试系统

<span>实现了一种可检测多种气体的气敏传感器阵列的自动测试系统;提出了可精确控制气体流量的配气系统;采用美国国家仪器(NI)公司的Compact FieldPoint模块实现了气敏传感器阵列的数据采集和测试系统的控制;并且利用图形化软件LabVIEW设计了一种兼容Compact FieldPoint模块的自动化控制和测试软件;结果表明,该自动测试系统稳定、便捷,可以在计算机自动测量与控制领域广泛的应用。</span