Circulating Long Noncoding RNA as a Potential Target for Prostate Cancer

Prostate cancer is considered the second most common visceral malignancy in men in Western countries. Its emergence is largely due to the coordination of a malignant network, and long noncoding RNA has been recently demonstrated to play a critical role in prostate carcinogenesis. The aberrant expression of long noncoding RNA in prostate cancer patients is strongly associated with diagnosis, risk stratification and carcinogenesis, information that provides new insight into the complicated intracellular milieu of prostate cancer. This review focuses mainly on literature evidence for the role of long noncoding RNA in prostate cancer, which may suggest novel strategies for its prognosis, diagnosis and clinical treatment.     

Performance of MPEG Codecs in the Presence of Errors

MPEG is emerging as a major international standard for applications in compressed video storage, transmission, and interactive communications. MPEG will be used in applications which involve imperfect channel conditions or storage defects. This work studies the effects of different types of errors on MPEG-encoded bit streams and possible approaches to minimize such effects. The applicability and tradeoff of forward error correction, block interleaving, and error concealment to MPEG-encoded bit streams are also investigated.     

碳纤维负载TiO2光催化薄膜的制备及其性能

 以PAN基碳纤维(CF)为基体,钛酸丁酯为前驱体,通过溶胶-凝胶浸渍涂覆法将TiO2负载于经过表面修饰的CF上,制备CF负载的TiO2光催化薄膜。采用扫描电子显微镜（SEM）和X射线衍射仪（XRD）表征了制备材料的形态结构,通过超声震荡清洗测试了CF对TiO2的负载牢度,以质量浓度为80 mg/L的酸性橙Ⅱ溶液为目标降解物,测试了材料在紫外线光照下的催化性能。结果表明：溶胶浓度影响制备材料的形态结构、CF对TiO2的负载率及负载牢度;溶胶浓度和退火温度对制备材料的催化活性有明显的影响。Ti浓度为0.5 mol/L的溶胶制备的TiO2/CF负载牢度好,负载率高,催化活性好。     

葡萄酒中多糖的研究进展

多糖是构成葡萄酒中大分子物质的主要成分之一,其含量及组成对葡萄酒质量产生重要的影响.对葡萄酒中常见多糖的来源、葡萄酒酿造过程中多糖的变化、多糖对葡萄酒感官影响和多糖的检测方法等方面进行阐述,对未来这一领域的研究进行了展望.     

Rate-distortion bound for a class of non-Gaussian sources withmemory

The rate-distortion performance of a class of non-Gaussian source with memory is studied. The source model is generated from a correlated Gaussian source through a memoryless transform, which actually constitutes a special class of the frequently-used Gibbs model in speech and image processing applications. Its entropy and a rate-distortion bound are evaluated to obtain further insights into this class of source models. Several examples are also given to illustrate the usefulness and tightness of the rate-distortion bound     

Seamless switching of scalable video bitstreams for efficient streaming

Efficient adaptation to channel bandwidth is broadly required for effective streaming video over the Internet. To address this requirement, a novel seamless switching scheme among scalable video bitstreams is proposed in this paper. It can significantly improve the performance of video streaming over a broad range of bit rates by fully taking advantage of both the high coding efficiency of nonscalable bitstreams and the flexibility of scalable bitstreams, where small channel bandwidth fluctuations are accommodated by the scalability of a single scalable bitstream, whereas large channel bandwidth fluctuations are tolerated by flexible switching between different scalable bitstreams. Two main techniques for switching between video bitstreams are proposed. Firstly, a novel coding scheme is proposed to enable drift-free switching at any frame from the current scalable bitstream to one operated at lower rates without sending any overhead bits. Secondly, a switching-frame coding scheme is proposed to greatly reduce the number of extra bits needed for switching from the current scalable bitstream to one operated at higher rates. Compared with existing approaches, such as switching between nonscalable bitstreams and streaming with a single scalable bitstream, our experimental results clearly show that the proposed scheme brings higher efficiency and more flexibility in video streaming.     

Development of an amperometric immunosensor based on TiO2 nanoparticles and gold nanoparticles

A highly hydrophilic, non-toxic and conductive TiO₂ nanoparticles/gold nanoparticles bilayer films as immobilization matrix via self-assembly (SA) and deposition method was prepared on a gold electrode. Subsequently, positively charged horseradish peroxidase (HRP) was assembled onto the bilayer films, which provided an interface to assemble gold nanoparticles for immobilization of carcinoembryonic antibody (anti-CEA). Finally, HRP was used to block sites against non-specific binding. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) were applied to characterize the electrochemical properties of the SA process. The CVs reduction current of the immunosensor decreases linearly in two concentrations ranges of CEA from 0.3 to 10 ng/ml and from 10 to 80 ng/ml with a detection limit of 0.2 ng/ml in presence of 0.7 mM H₂O₂ in analyte solution. Effects of deposition time, pH of working buffer, temperature and incubation time were also explored for optimum analytical performance by using the amperometric method. Moreover, the proposed immunosensor exhibited good accuracy, high sensitivity, long-term stability and made it to determine CEA in serum samples with satisfactory results.     

肉品生产中禁用药物西马特罗研究进展

随着肉品中毒事件的不断出现,肉品安全问题越来越受到人们的重视。西马特罗作为一种违禁药物,在畜牧业中的非法使用,会导致严重的后果,严重会导致人员伤亡。因此,加强肉品生产过程中违禁药物西马特罗非法使用的监控,具有十分重要的现实意义。本文对西马特罗的研究进展做了总结综述,主要包括西马特罗作用和危害,以及检测方法研究进展,并提出了防控肉品中西马特罗的措施,以期为在畜牧业肉品生产过程中加强西马特罗非法使用的监测提供技术支持,并为国家相关执法部门的监控提供理论依据和指导,保证广大消费者肉品食用安全。     

云南产6种蜂蜜中35种游离氨基酸的测定

目的采用全自动氨基酸分析仪测定蜂蜜中35种游离氨基酸的含量。方法蜂蜜样品经水溶解,采用全自动氨基酸分析仪进行定量检测。检测器为荧光检测器,脯氨酸在波长440 nm处测定,其余34种氨基酸在570 nm波长下测定。结果蜂蜜中含有丰富的游离氨基酸成分,且氨基酸组成及含量存在较大区别。脯氨酸是蜂蜜中的主要氨基酸,其平均含量为0.042978 g/100g,占氨基酸组分总含量的71.21%。35种游离氨基酸的线性相关系数均达到0.99以上,回收率在92.4%~109.4%范围内。结论该方法快速、准确,可用于蜂蜜中游离氨基酸含量的测定。