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17 results on '"Wu, Wen-Da"'

16. DNA Electrochemical Aptasensor for Detecting Fumonisins B1 Based on Graphene and Thionine Nanocomposite.

Author

Shi, Zhi‐Yu, Zheng, Ya‐Ting, Zhang, Hao‐Bo, He, Cheng‐Hua, Wu, Wen‐Da, and Zhang, Hai‐Bin

Subjects
ELECTROCHEMICAL sensors, DNA, FUMONISINS, GRAPHENE, THIONINE, NANOCOMPOSITE materials
Abstract

In this paper, a novel aptasensor was designed by with the dual amplification of Au nanoparticles (AuNPs) and graphene/thionine nanocomposites (GS-TH) for sensitive determination of fumonisins B1 (FB1). AuNPs is modified at the electrode surface to increase the electrical conductivity and fabricate specific recognition interface for FB1 through the hybridization of capture DNA and its aptamer. Large number of TH molecules were loaded at the surface of graphene sheet to served as electrochemical probe and increase its electrochemical signal due to the excellent conductivity and large surface area of graphene sheet. This type of nanocomposites is then assembled to the single strand section of FB1 aptamer at electrode surface by π-π stacking interactions between them, leading to an enhanced electrochemical signal. After the specific combination between FB1 aptamer and its target (FB1) in solution, GS-TH was released from electrode surface, resulting in a decreased electrochemical signal. The result demonstrated that the decreased currents were proportional to the FB1 concentration in the range of 1-106 pg/mL with a detection limit of 1 pg/mL. Besides, the developed aptasensor was also applied successfully for the determination of FB1 in feed samples. The result shows this aptasensor has a higher sensitivity and selectivity. [ABSTRACT FROM AUTHOR]

Published
2015
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17. Summary results of the shanghai-effelsberg VLBI experiment

Author

Wu Wen-da, Hua De-min, Wu Lin-da, Qian Zhi-han, R.A. Porcas, Wan Tong-shan, and D.A. Graham

Subjects
Physics, Astronomy, Astronomy and Astrophysics, Astrometry, Recording system, Declination, Component separation, West germany, law.invention, Space and Planetary Science, law, Very-long-baseline interferometry, Ionosphere, Maser
Abstract

The first VLBI experiment between Shanghai and Effelsberg, West Germany, was carried out at 1430 MHz in November 1981. The observations lasted 54 hours and the Mark II recording system and hydrogen masers were used at both stations. Fourteen extragalactic sources covering a wide range of declination were duly observed. The Shanghai-Effelsberg baseline vector was determined to an estimated formal precision of 2–3 metres and the positions of the sources 1739 + 52 and 1928 + 73, to 0 ″ . 05 − 0 ″ . 08 in each coordinate, with the effects of the ionosphere not removed. The source of 1928 + 73 was found to be double with a component separation of 0 ″ . 0089 .

Published
1983

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