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  • 1
    Online Resource
    Online Resource
    Dammarane-type triterpenoids from Gynostemma compressum X. X. Chen & D. R. Liang (Cucurbitaceae) and their AMPK activation effect in 3T3-L1 cells
    Elsevier BV ; 2022
    In:  Phytochemistry Vol. 200 ( 2022-08), p. 113218-
    Details
    In: Phytochemistry, Elsevier BV, Vol. 200 ( 2022-08), p. 113218-
    Type of Medium: Online Resource
    ISSN: 0031-9422
    URL: Article
    DOI: 10.1016/j.phytochem.2022.113218
    RVK:
    WA 15000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2022
    detail.hit.zdb_id: 2000313-4
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    Quasi‐3D‐Structured Surface‐Enhanced Raman Scattering Substrates Based on Silver Nanoparticles/Mesoporous Silicon Hybrid
    Wiley ; 2022
    In:  physica status solidi (a) Vol. 219, No. 18 ( 2022-09)
    Details
    In: physica status solidi (a), Wiley, Vol. 219, No. 18 ( 2022-09)
    Abstract: The surface‐enhanced Raman scattering (SERS) is a powerful spectroscopic technique for ultrasensitive and selective biochemical detection due to its capability of providing the “fingerprint” of information of molecular structures at low concentrations. Herein, mesoporous silicon (MPSi)‐based nanocomposites containing silver nanoparticles (AgNPs) provide novel efficient substrates for the detection of molecules. The quasi‐3D‐structured SERS substrate is formed by introducing Ag into the MPSi hollow column‐shaped nanostructure. This SERS substrate uniquely combines the ability of metal surfaces to amplify Raman scattering signals with an enlarged surface area and the increasing light–matter interaction duration that generates large SERS signals for the detection of chemicals. The proposed SERS substrate is verified by detecting orange methylene in solutions at ultralow concentration in the range of 10 −11 –10 −6   m with a linear‐dependent coefficient of R 2  = 0.99922 and the SERS enhancement factor is achieved up to 10 10 . Moreover, the proposed platform can detect diphenylamine with ultralow concentration of 10 −10  m and reliable reproducibility with an average relative stand deviation of 6.3%. The ability for MPSi substrate to detect target molecules at low concentrations helps pave a way to develop the detection tool for integrated, on‐chip devices.
    Type of Medium: Online Resource
    ISSN: 1862-6300 , 1862-6319
    URL: Issue
    URL: Article
    DOI: 10.1002/pssa.v219.18
    DOI: 10.1002/pssa.202200128
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 1481091-8
    detail.hit.zdb_id: 208850-2
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  • 3
    Online Resource
    Online Resource
    Synthesis and deposition of Silver nanostructures on the silica microsphere by laser-assisted photochemical method for SERS applications
    Photonics Society of Poland ; 2020
    In:  Photonics Letters of Poland Vol. 12, No. 4 ( 2020-12-17), p. 97-
    Details
    In: Photonics Letters of Poland, Photonics Society of Poland, Vol. 12, No. 4 ( 2020-12-17), p. 97-
    Abstract: The homogeneous distribution of nano-metallic structures on the surface-enhanced Raman (SERS) substrates plays an important factor for high-sensitive Raman scattering measurement. In this paper, we present a low-cost laser-assisted photochemical method for making a SERS probe based on silver nanostructures, which are one-timely synthesized nano-silver structures, homogeneously deposited on silica microsphere surfaces. Achieved SERS-activity substrates with a homogeneous distribution of Ag-nanostructures are verified by a mapping technique on the surface of Ag-coated microsphere for the detection of low concentration of Rhodamine 6G in aqueous solutions in a range of 10-4-10-9M. The obtained results show that a SERS microsphere probe has a good repetition of SERS-activity in any space of sensing area, and large potential for application in a biochemical sensing technique. Full Text: PDF ReferencesY. Chen et al., "Interfacial reactions in lithium batteries", J. Phys. D: Appl. Phys. 50, 02510 (2017). CrossRef T.B. Pham, H. Bui, H.T. Le, V.H. Pham, "Characteristics of the Fiber Laser Sensor System Based on Etched-Bragg Grating Sensing Probe for Determination of the Low Nitrate Concentration in Water", Sensors 17, 0007 (2017). CrossRef X. Wang, O.S. Wolfbeis, "Fiber-Optic Chemical Sensors and Biosensors (2013–2015)", Anal. Chem. 88, 203 (2016). CrossRef R. Wang, K. Kim, N. Choi, X. Wang, J. Lee, J.H. Joen, G. Rhie, J. Choo, "Highly sensitive detection of high-risk bacterial pathogens using SERS-based lateral flow assay strips", Sens. Actuators B-Chem. 270, 72 (2018). CrossRef H. Zhang et al., "Determination of Pesticides by Surface-Enhanced Raman Spectroscopy on Gold-Nanoparticle-Modified Polymethacrylate", Anal. Let. 49, 2268 (2016). CrossRef L. Chen, H. Yan, X. Xue, D. Jiang, Y. Cai, D. Liang, Y.M. Jung, X.X. Han, B. Zhao, "Surface-Enhanced Raman Scattering (SERS) Active Gold Nanoparticles Decorated on a Porous Polymer Filter", Appl. Spectrosc. 71, 1543 (2017). CrossRef A. Matikainen, T. Nuutinen, P. Vahimaa, S. Honkanen, "A solution to the fabrication and tarnishing problems of surface-enhanced Raman spectroscopy (SERS) fiber probes", Sci. Rep. 5, 8320 (2015). CrossRef J. Zhang, S. Chen, T. Gong, X. Zhang, Y. Zhu, "Tapered Fiber Probe Modified by Ag Nanoparticles for SERS Detection", Plasm. 11, 743 (2016). CrossRef W. Xu et al., "A Dual-Butterfly Structure Gyroscope", Sensors 17, 467 (2017). CrossRef K. Setoura, S. Ito, M. Yamada, H. Yamauchi, H. Miyasaka, "Fabrication of silver nanoparticles from silver salt aqueous solution at water-glass interface by visible CW laser irradiation without reducing reagents", J. Photochem. Photobio. A: Chem. 344, 168 (2017). CrossRef K. Liu, Y. Bai, L. Zhang, Z. Yang, Q. Fan, H. Zheng, Y. Yin, C. Gao, "Porous Au–Ag Nanospheres with High-Density and Highly Accessible Hotspots for SERS Analysis", Nano Lett. 16, 3675 (2016). CrossRef Z. Huang, X. Lei, Y. Liu, Z. Wang, X. Wang, Z. Wang, Q. Mao, G. Meng, "Tapered Optical Fiber Probe Assembled with Plasmonic Nanostructures for Surface-Enhanced Raman Scattering Application", ACS Appl. Mater. Interfaces 7, 17247 (2015). CrossRef
    Type of Medium: Online Resource
    ISSN: 2080-2242
    URL: Article
    DOI: 10.4302/plp.v12i4.1049
    Language: Unknown
    Publisher: Photonics Society of Poland
    Publication Date: 2020
    detail.hit.zdb_id: 2573654-1
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  • 4
    Online Resource
    Online Resource
    High enhancement factor of SERS probe based on silver nano-structures deposited on a silica microsphere by laser-assisted photochemical method
    IOP Publishing ; 2021
    In:  Measurement Science and Technology Vol. 32, No. 2 ( 2021-02-01), p. 025109-
    Details
    In: Measurement Science and Technology, IOP Publishing, Vol. 32, No. 2 ( 2021-02-01), p. 025109-
    Abstract: The high enhancement factor (EF) of surface-enhanced Raman (SERS) probes is an important parameter for high-sensitivity Raman scattering measurement applied to environment control. In this article, we present a SERS probe based on silver nano-structures deposited on silica microsphere surfaces made by the laser-assisted photochemical method and reflection converging mirror for a high EF Raman measurement of ultralow organic compound concentration inliquid environments. The laser-assisted photochemical method can synthesize and homogeneously deposit nano-silvers on a silica microsphere, and the reflection converging mirror can collect more Raman signal to the photo-detector and give high Raman enhancement of the SERS probe. The SERS-activity of the probe is verified by the detection of ultralow concentrations of Rhodamine 6 G in aqueous solutions in the range of 10 −4 –10 −10 M. The obtained results show that the proposed SERS probe has an increase of collected Raman intensity up to 32% in comparison to a SERS probe without reflection converging mirror, and an EF of the SERS probe achieved up to 1.8 × 10 10 . We believe that the novel SERS probe has a large potential for applications in biochemical sensing techniques.
    Type of Medium: Online Resource
    ISSN: 0957-0233 , 1361-6501
    URL: Article
    DOI: 10.1088/1361-6501/abab20
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 1362523-8
    detail.hit.zdb_id: 1011901-2
    SSG: 11
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  • 5
    Online Resource
    Online Resource
    Suitable pilot search method for channel estimation in underwater acoustic OFDM systems
    Academy of Military Science and Technology ; 2023
    In:  Journal of Military Science and Technology Vol. 89 ( 2023-08-25), p. 52-59
    Details
    In: Journal of Military Science and Technology, Academy of Military Science and Technology, Vol. 89 ( 2023-08-25), p. 52-59
    Abstract: The underwater environment poses challenges to the Underwater Acoustic OFDM (UWA-OFDM) system, causing the tendency of lacking pilots to recover the channel impulse response (CIR). Our previous research (pilot enrichment estimator) supplemented potential pilots based on the distance to the nearest constellation point below a fixed threshold T. However, this does not guarantee that the extracted pilots have sufficiently good quality. Therefore, this article presents a suitable pilot search (SPS) method with the flexible threshold T and second minimum mean square error (MMSE) estimation to improve channel estimation effectiveness in UWA-OFDM systems. Our approach is compared to the MMSE and PE methods across various criteria, such as pilot spacing and different modulators. The experiments demonstrate that the SPS estimator performs better than the MMSE and PE techniques regarding bit error rate (BER).
    Type of Medium: Online Resource
    ISSN: 1859-1043
    URL: Article
    DOI: 10.54939/1859-1043.j.mst.89.2023.52-59
    Language: Unknown
    Publisher: Academy of Military Science and Technology
    Publication Date: 2023
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  • 6
    Online Resource
    Online Resource
    Đặc điểm của các ca bệnh nhiễm vi rút Chikungunya tại huyện An Phú tỉnh An Giang năm 2020
    Tap chi Y hoc du phong (Vietnam Journal of Preventive Medicine-VJPM) ; 2022
    In:  Tạp chí Y học Dự phòng Vol. 32, No. 2 Phụ bản ( 2022-05-24), p. 86-92
    Details
    In: Tạp chí Y học Dự phòng, Tap chi Y hoc du phong (Vietnam Journal of Preventive Medicine-VJPM), Vol. 32, No. 2 Phụ bản ( 2022-05-24), p. 86-92
    Abstract: Trước nguy cơ xâm nhập bệnh do vi rút Chikugunya tại các huyện biên giới tiếp giáp với Campuchia năm 2020, An Giang đã thiết lập điểm giám sát ca bệnh tại huyện An Phú từ tháng 10 - 12/2020, và phát hiện 6 ca bệnh nhiễm vi rút Chikugunya trong cộng đồng. Nghiên cứu tiến hành báo cáo loạt ca 6 ca bệnh này nhằm mô tả những đặc điểm lâm sàng và dịch tễ học và từ đó, xác định nguy cơ xâm nhập của Chikungunya tại khu vực phía Nam. Kết quả cho thấy các ca bệnh phát hiện tập trung ở thị trấn Long Bình và xã Quốc Thái, nơi tiếp giáp với Campuchia. Triệu chứng lâm sàng phát hiện chủ yếu là sốt (6/6 ca), đau khớp (5/6 ca). Ca bệnh không có tiền sử đi từ vùng dịch về và không có tiền sử bệnh lý. Kết quả điều tra ở khu vực nhà bệnh nhân và khu vực công cộng đều phát hiện có muỗi Aedes egypti và lăng quăng truyền bệnh. Với 6 mẫu muỗi cái thu thập được tại một điểm điều tra xã Quốc Thái phát hiện có 1 mẫu dương tính với vi rút Dengue. Việc phát hiện liên tục 6 ca mắc Chikungunya trong 3 tháng cuối năm 2020 cùng với chỉ số mật độ véc tơ ở mức cao, nguy cơ Chikungunya đã xâm nhập vào An Giang. Việc thiết lập giám sát trọng điểm ba tác nhân Dengue – Zika - Chikungunya là cần thiết cho đánh giá nguy cơ và kiểm soát bệnh.
    Type of Medium: Online Resource
    ISSN: 0868-2836
    URL: Article
    DOI: 10.51403/0868-2836/2022/612
    Language: Unknown
    Publisher: Tap chi Y hoc du phong (Vietnam Journal of Preventive Medicine-VJPM)
    Publication Date: 2022
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  • 7
    Online Resource
    Online Resource
    Severe COVID ‐19 pneumonia in pregnant woman treated with pulse corticosteroids therapy and third‐trimester caesarean section: A case report
    Wiley ; 2023
    In:  Respirology Case Reports Vol. 11, No. 5 ( 2023-05)
    Details
    In: Respirology Case Reports, Wiley, Vol. 11, No. 5 ( 2023-05)
    Abstract: A 44‐year‐old woman at 30 weeks of pregnancy was admitted to the Intensive Care Unit with a diagnosis of severe COVID‐19 pneumonia. Her condition worsened quickly, defined by prolonged hypoxia even with intensive therapy and oxygen supplementation. This led to the decision to perform a caesarean delivery and continue pulse corticosteroids therapy after delivery. Soon after she recovered from COVID‐19 pneumonia, her life was threatened again by septic shock from hospital‐acquired pneumonia. After nearly 1 month of hospitalization, she was discharged and fully recovered on the re‐examination day 10 months later.
    Type of Medium: Online Resource
    ISSN: 2051-3380 , 2051-3380
    URL: Issue
    URL: Article
    DOI: 10.1002/rcr2.v11.5
    DOI: 10.1002/rcr2.1139
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2750180-2
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  • 8
    Online Resource
    Online Resource
    Preparation of activated red mud and its application for removal of hydrogen sulfide in air
    Viet Nam National University Ho Chi Minh City ; 2020
    In:  Science & Technology Development Journal - Engineering and Technology Vol. 3, No. 2 ( 2020-07-03), p. First-
    Details
    In: Science & Technology Development Journal - Engineering and Technology, Viet Nam National University Ho Chi Minh City, Vol. 3, No. 2 ( 2020-07-03), p. First-
    Abstract: Red mud is a highly alkaline solid waste from the Bayer process for aluminum production. Red mud reservoirs are usually considered as a potential environmental risk. The treatment of red mud is costly due to the lack of an effective and economical treatment technology. On the other hand, the main components of red mud are Fe2O3, Al2O3, SiO2, and Na2O, which could be employed as a promising precursor for the preparation of various nanomaterials. In this study, we prepared activated red mud by thermal and acid treatment method and applied it for adsorption of H2S in air. The red mud was activated under different temperatures (i.e., 200, 400, 600, and 800 oC for 4 h), types of acid (i.e., H2SO4 and HCl), and acid concentrations (i.e., 0.5, 1.5, and 2.5 M). The produced materials were then applied for H2S removal in air with concentration of 90 – 110 mg/m3 using a fix-bed adsorption column test. Results showed that red mud activated at 800 oC and with 1.5 M H2SO4 solution had the highest adsorption capacity of 29.38 mg/g with an average removal efficiency of 80.2%. The effects of gas flow rate and initial H2S concentration were also investigated, and the highest removal capacity was achieved at an inlet concentration of 100 mg/m3 and flow rate of 1 L/min. Both Langmuir and Freundlich adsorption isotherms were employed for modelling the H2S adsorption by this material and the experimental result was more fitted with the Langmuir isotherm. The thermal desorption and recyclability test were also conducted for evaluating the practical application of activated red mud material and 200 oC was the suggested desorption temperature with 81.7% adsorption capacity recovery.
    Type of Medium: Online Resource
    ISSN: 2615-9872 , 2615-9872
    URL: Article
    DOI: 10.32508/stdjet.v3i2.474
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2020
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  • 9
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    Online Resource
    Expanding severe acute respiratory infection ( SARI ) surveillance beyond influenza: The process and data from 1 year of implementation in Vietnam
    Wiley ; 2018
    In:  Influenza and Other Respiratory Viruses Vol. 12, No. 5 ( 2018-09), p. 632-642
    Details
    In: Influenza and Other Respiratory Viruses, Wiley, Vol. 12, No. 5 ( 2018-09), p. 632-642
    Abstract: In 2016, as a component of the Global Health Security Agenda, the Vietnam Ministry of Health expanded its existing influenza sentinel surveillance for severe acute respiratory infections ( SARI ) to include testing for 7 additional viral respiratory pathogens. This article describes the steps taken to implement expanded SARI surveillance in Vietnam and reports data from 1 year of expanded surveillance. Methods The process of expanding the suite of pathogens for routine testing by real‐time reverse transcriptase–polymerase chain reaction ( rRT ‐ PCR ) included laboratory trainings, procurement/distribution of reagents, and strengthening and aligning SARI surveillance epidemiology practices at sentinel sites and regional institutes ( RI ). Results Surveillance data showed that of 4003 specimens tested by the RI laboratories, 20.2% (n = 810) were positive for influenza virus. Of the 3193 influenza‐negative specimens, 41.8% (n = 1337) were positive for at least 1 non‐influenza respiratory virus, of which 16.2% (n = 518), 13.4% (n = 428), and 9.6% (n = 308) tested positive for respiratory syncytial virus, rhinovirus, and adenovirus, respectively. Conclusions The Government of Vietnam has demonstrated that expanding respiratory viral surveillance by strengthening and building upon an influenza platform is feasible, efficient, and practical.
    Type of Medium: Online Resource
    ISSN: 1750-2640 , 1750-2659
    URL: Issue
    URL: Article
    DOI: 10.1111/irv.2018.12.issue-5
    DOI: 10.1111/irv.12571
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2272349-3
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  • 10
    Online Resource
    Online Resource
    Adsorption and partial catalytic oxidation of hydrogen sulfide to elemental sulfur using facilely prepared materials derived from sludge of groundwater treatment
    Wiley ; 2024
    In:  Environmental Progress & Sustainable Energy
    Details
    In: Environmental Progress & Sustainable Energy, Wiley
    Abstract: Realizing the use of biogas as fuel or a gas engine, it is needed to upgrade to natural gas standards when it comes to pure biomethane, meaning impurities must be removed to a certain low concentration. Among these tasks, hydrogen sulfide (H 2 S) removal steadfastly gets the most attention. In the present work, partial catalytic oxidation was used to convert H 2 S to less harmful forms. Adsorbents/catalysts applied to this process were prepared from the sludge of a groundwater treatment plant using a simple combination of drying and calcination methods. As a relevant result, the as‐prepared sample (dried at 105°C for 24 h) exhibited high activity, with 90 ± 2% H 2 S conversion after 120 min of reaction time, while the sample calcined at about 500°C for 5 h (TP‐500) showed the highest H 2 S conversion (96 ± 2%); the lowest 28 ± 1% belonged to the case of TP‐700. The main compositions of the TP‐500 sample were crystalline calcite and amorphous iron oxides. The average size of calcite crystallites was ~45 nm, with a specific surface area of ~76 m 2 /g. Moreover, the presence of oxygen in the catalytic process and the “self‐outflow process” of sulfur desorption were the vital keys that allowed the partial H 2 S oxidation to take place continuously. After a reaction time of 2 h, the adsorption capacity of the best sample was 460.8 mg/g. Thus, it is obvious that inexpensive catalysts derived from sludge precursors can be effectively used for H 2 S removal from mixtures with air, supporting the treatment of raw biogas in the coming time.
    Type of Medium: Online Resource
    ISSN: 1944-7442 , 1944-7450
    URL: Article
    DOI: 10.1002/ep.14383
    Language: English
    Publisher: Wiley
    Publication Date: 2024
    detail.hit.zdb_id: 2462324-6
    SSG: 21
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