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Thanh TT, Nhan NTT, Anh NT, Chung LT, Duyen PTT, Chi LTK, Thu NTH, Hieu PT, Van Phuc D, Son PV, Anh DQ, Nam PT, Thuc NT, Hanh NT, Thuy LT, Tram LLT, Thanh LK, Ny NTH, Nhu LNT, Chau NVV, Thwaites G, Thanh TT, Van Tan L. SARS-CoV-2 RNA loads in Vietnamese children. J Infect 2022; 84:579-613. [PMID: 35033580 PMCID: PMC8757648 DOI: 10.1016/j.jinf.2022.01.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 01/08/2022] [Indexed: 11/03/2022]
Affiliation(s)
| | | | - Nguyen To Anh
- Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam
| | | | | | | | | | | | | | | | | | - Pham Thi Nam
- Center for Disease Control, Da Nang City, Vietnam
| | | | - Nguyen Thi Hanh
- University of Medical Technology and Pharmacy, Da Nang City, Vietnam
| | - Le Thi Thuy
- University of Medical Technology and Pharmacy, Da Nang City, Vietnam
| | | | - Le Kim Thanh
- Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam
| | | | | | - Nguyen Van Vinh Chau
- Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam; Department of Health, Ho Chi Minh City, Vietnam
| | - Guy Thwaites
- Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam; Centre for Tropical Medicine, Nuffield Department of Medicine, University of Oxford, UK
| | - Tran Tan Thanh
- Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam
| | - Le Van Tan
- Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam.
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Cao C, Gontard LC, Thuy Tram LL, Wolff A, Bang DD. Dual enlargement of gold nanoparticles: from mechanism to scanometric detection of pathogenic bacteria. Small 2011; 7:1701-8. [PMID: 21557470 DOI: 10.1002/smll.201100294] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2011] [Revised: 03/01/2011] [Indexed: 05/18/2023]
Abstract
A mechanism of dual enlargement of gold nanoparticles (AuNPs) comprising two steps is described. In the first step, the AuNPs are enlarged by depositing Au atoms on their crystalline faces. In this process, the particles are not only enlarged but they are also observed to multiply: new Au nuclei are formed by the budding and division of the enlarged particles. In the second step, a silver enhancement is subsequently performed by the deposition of silver atoms on the enlarged and newly formed AuNPs to generate bimetallic Au@Ag core-shell structures. The dual nanocatalysis greatly enhances the electron density of the nanostructures, leading to a stronger intensity for colorimetric discrimination as well as better sensitivity for quantitative measurement. Based on this, a simple scanometric assay for the on-slide detection of the food-born pathogen Campylobacter jejuni is developed. After capturing the target bacteria, gold-tagged immunoprobes are added to create a signal on a solid substrate. The signal is then amplified by the dual enlargement process, resulting in a strong color intensity that can easily be recognized by the unaided eye, or measured by an inexpensive flatbed scanner. In this paper, dual nanocatalysis is reported for the first time. It provides a valuable mechanistic insight into the development of a simple and cost-effective detection format.
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Affiliation(s)
- Cuong Cao
- DTU-Vet, Laboratory of Applied Micro-Nanotechnology, Department of Poultry, Fish, and Fur Animals, National Veterinary Institute, Technical University of Denmark, Hangovej 2, DK-8200 Aarhus N, Denmark
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