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5 results on '"Zhang, En-di"'

4. Adsorption-controlled transition of the electrical properties realized in Hematite (alpha-Fe 2 O 3 ) nanorods ethanol sensing

Author

Fu Xing-Qiu, Wang Chong, Wang Fei-Fei, Xu Zhi, and Zhang En-Di

Subjects
Materials science, General Physics and Astronomy, chemistry.chemical_element, Nanotechnology, Hematite, Oxygen, Concentration ratio, Hydrothermal circulation, Adsorption, Chemical engineering, chemistry, Chemisorption, visual_art, visual_art.visual_art_medium, Hydrothermal synthesis, Nanorod
Abstract

Alpha-Fe2O3 nanorods are synthesized through a hydrothermal method with no surfactant introduced and ethanol sensors are fabricated from these nanorods. The device can respond to ethanol vapour in a concentration range from 1 to 1500 parts per million and shows both p-type and n-type responding characteristics during the investigation of the ethanol sensing. The sensor displays a p-type characteristic when the ethanol concentration is low and converted into an n-type characteristic as the concentration exceeds a certain value. Such a phenomenon is attributed to the chemisorbed oxygen, which leads to different modifications of the energy band at the surface, namely, depletion layer or inversion layer.

Published
2011

5. [Study on the presence of hepatitis B virus in first-trimester villi in pregnant women with hepatitis B surface antigen positive].

Author

Chang WH, Xu DZ, Yan YP, Du KJ, Men K, Zhang JX, Wang JJ, Xu JQ, Zhang ED, Liu C, and Sun FM

Subjects
Chorionic Villi ultrastructure, Female, Hepatitis Antibodies blood, Hepatitis B blood, Hepatitis B immunology, Hepatitis B virus ultrastructure, Humans, Pregnancy, Chorionic Villi virology, Hepatitis B virology, Hepatitis B Surface Antigens blood, Hepatitis B virus isolation & purification, Pregnancy Complications, Infectious virology, Pregnancy Trimester, First
Abstract

Objective: To observe the presence of hepatitis B virus (HBV) in first-trimester villi cells from pregnant women carrying HBsAg., Methods: Immunohistochemical streptavidin-biotin peroxidase complex (SABC) staining with monoclonal HBsAg, hepatitis B core antigen (HBcAg) and PCR, in situ hybridization were used for detection of HBV infection markers in villi. Positive villi ultramicrostructures were observed with transmission electron microscope., Results: HBV was detected in 8 of 25 villi of HBsAg positive pregnant women, the positive rate was 32%. HBsAg was located in the decidual cell, trophoblastic cell and villous mesenchymal cell. HBV analog was detected in rough endoplasmic reticulum of trophoblastic cell., Conclusions: HBV may infect villous cells in first-trimester pregnancy. It would be impossible for HBV to transmit the desmosomes.

Published
2005

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