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Le, Thi Thanh Huong,Tran, Khanh Long,Phung, Xuan Son,Do, Phuc Huyen,Phan, Thuy Linh,Nguyen, Ngoc Bich,Nguyen, Xuan Lam,Le, Vu Anh,Tran, Thi Tuyet-Hanh Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.no.sup1
Comprehensive bans on tobacco advertising and promotion were introduced through tobacco control legislation in Viet Nam, but it has been established that violations of the bans are very common. This study was conducted to explore the trend in violations of bans on tobacco advertising and promotion at points of sale in Viet Nam in the past six years and to explore any differences in the violation situations before and after the Law on Tobacco Control came into effect on 1st May 2013. Quantitative data were collected through observation of violations of the bans on tobacco advertising and promotion at points of sale in 10 provinces throughout Viet Nam in four survey rounds (2009, 2010, 2011, and 2015). Variation in violation prevalence over time was examined by chi-square test using a Bonferini method. Binary logistic regression was employed to identify the factors that may have influences on different types of violation. A level of significance of p<0.05 was used for all tests in this article. The most common form of violation was the display of more than one pack/one carton of a cigarette brand. Violation of bans on tobacco advertising increased while violations on promotion ban and on displaying tobacco decreased through time. Some factors associated with the tobacco advertising and promotion bans included surveyed years, types of points of sale, regions and areas where the points of sale were located. The enforcement of the bans did not improve even after the issuance and the enactment of the Law on Tobacco Control. This suggests that the monitoring and enforcement of bans on tobacco advertising and promotion at points of sale should be strengthened. Penalties should be strictly applied for violators as indicated in the current tobacco control legislation.
Vo Minh Hoang Do,Long Giang Bach,Diem-Huong Nguyen Tran,Van Du Cao,Thi Nhu Quynh Nguyen,Duc Thuan Hoang,Van Cuong Ngo,Dai Hai Nguyen,Thai Thanh Hoang Thi 한국생물공학회 2020 Biotechnology and Bioprocess Engineering Vol.25 No.2
Polyamidoamine (PAMAM) dendrimer is emerging as an effective nanocarrier for delivering anticancer drugs. Still, unmodified PAMAM dendrimer is hardly used in vivo because of unsatisfied drug release, high tendency of interfering with cellular membranes, and rapid clearance by reticuloendothelial system. In this study, low generation polyamidoamine (PAMAM) dendrimer G3.0 is developed and surface modified with methoxypolyethylene glycol (PAMAM G3.0-mPEG) to overcome its limitations. Specifically, PAMAM G3.0 conjugated with mPEG at different ratios are investigated to effectively eliminate its charge-associated toxicity, in which PAMAM G3.0-mPEG- 8 is chosen for oxaliplatin (OX) loading. Results reveal that OX-loaded PAMAM G3.0-mPEG-8 has desirable size, good entrapment efficiency, and sustained release with minimum drug leakage. In addition, Resazurin assay indicates that the toxicity of loaded OX is reduced as compared to free drug but still maintain substantially anticancer activity on HeLa cells, suggesting the potential application of PAMAM G3.0-mPEG-8 for OX delivery in cancer therapy.
Fabrication and Photoluminescence Properties of ZnS Nanoribbons and Nanowires
Ngo Xuan Dai,Do Thanh Long,Nguyen Ngoc Long,Nguyen Thi Thuc Hien 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Zinc-sulfide (ZnS) nanoribbons and nanowires were fabricated via thermal evaporation of ZnS powder using a gold catalyst. The ZnS nanoribbons had thicknesses of about 100 nm, lateral di- mensions of several micrometers and lengths of hundreds to thousands of micrometers. The ZnS nanowires have diameters of 200 nm and lengths of thousands of micrometers. The photolumines- cence of the as-synthesized ZnS nanostructures in temperature range from 15 K to room temperature was investigated. We observed two groups of lines, one in the ultraviolet (UV) and one in the visible regions of the photoluminescence spectrum, at 15 K for the ZnS nanoribbons and nanowires. The UV lines were located at 3.777 eV (328.3 nm), 3.735 eV (332.0 nm), 3.699 eV (335.2 nm), 3.657 eV (339.0 nm), 3.618 eV (342.7 nm), 3.573 eV (347.0 nm) and 3.391 eV (365.6 nm). The visible lines were located at 3.024 eV (410.0 nm), 2.842 eV (436.3 nm) and 2.450 eV (506.1 nm). The origins of these emission lines will be discussed. Zinc-sulfide (ZnS) nanoribbons and nanowires were fabricated via thermal evaporation of ZnS powder using a gold catalyst. The ZnS nanoribbons had thicknesses of about 100 nm, lateral di- mensions of several micrometers and lengths of hundreds to thousands of micrometers. The ZnS nanowires have diameters of 200 nm and lengths of thousands of micrometers. The photolumines- cence of the as-synthesized ZnS nanostructures in temperature range from 15 K to room temperature was investigated. We observed two groups of lines, one in the ultraviolet (UV) and one in the visible regions of the photoluminescence spectrum, at 15 K for the ZnS nanoribbons and nanowires. The UV lines were located at 3.777 eV (328.3 nm), 3.735 eV (332.0 nm), 3.699 eV (335.2 nm), 3.657 eV (339.0 nm), 3.618 eV (342.7 nm), 3.573 eV (347.0 nm) and 3.391 eV (365.6 nm). The visible lines were located at 3.024 eV (410.0 nm), 2.842 eV (436.3 nm) and 2.450 eV (506.1 nm). The origins of these emission lines will be discussed.
Chien Minh Tran,Ngoc Thi‑Thanh Nguyen,Minh Hieu Ho,Vinh Khanh Doan,Khanh Loan Ly,Nhi Ngoc‑Thao Dang,Nam Minh‑Phuong Tran,Hoai Thi‑Thu Nguyen,Long Phuoc Truong,Thai Minh Do,Quyen Ngoc Tran,Hien Quoc Ng 한국섬유공학회 2023 Fibers and polymers Vol.24 No.1
In this study, we proposed a straightforward electrospun polycaprolactone (PCL) loaded with silver nanoparticles (SNPs)membrane fabrication process, in which SNPs were directly synthesized from silver nitrate (AgNO3) in PCL–acetone mixtureby gamma irradiation. The insolubility of AgNO3in PCL solution was solved using an auxiliary dimethyl sulfoxide solvent. As a physical approach, gamma rays readily converted silver ions into SNPs without the addition of harmful reductionagents, which reduced the cytotoxicity of the synthesized material. By avoiding some processes such as purification, solventremoval, or redispersion of SNPs, this method was more time-saving compared to other related studies. SNPs formation wasconfirmed by both UV–Visible spectrum (UV–Vis) and X-ray diffraction analysis. Scanning electron microscopy (SEM)revealed that the addition of SNPs significantly reduced the fiber diameter of PCL–Ag membranes compared to that of rawPCL. Uniform spherical-shaped SNPs incorporated in PCL fibers were observed under transmission electron microscopy(TEM). The tensile test showed that the electrospun PCL–Ag membranes exhibited good mechanical characteristics. Moistureeasily penetrated the porous microstructure of PCL–Ag, facilitating wound humidity regulation. Inductively coupledplasma-mass spectroscopy (ICP-MS) was employed to study the release profiles of SNPs at different time intervals. Overall,the PCL–Ag 500 ppm sample exerted excellent antibacterial activity against Pseudomonas aeruginosa and Staphylococcusaureus strains and low in vitro cytotoxicity.