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Huaixian Xiao, Na Liu, Ke Tian, Shixiang Liu, Fei Ge
Nanoparticles have been reported to induce toxicity to aquatic organisms, however, their potential impacts on phosphorus removal from wastewater by algae are unclear. In this study, the effects of nanoparticle ZnO (nano-ZnO) on phosphate (PO4 3- ) removal by a green alga Chlorella vulgaris were investigated. We found that PO4 3- removal efficiency was accelerated with high concentrations of nano-ZnO (0.04-0.15mM) but reduced with low concentrations of nano-ZnO (0.005-0.04mM) compared to the control (without nano-ZnO), suggesting that PO4 3- removal efficiency by C...
April 18, 2018: Science of the Total Environment
Seyyed Pouya Hadipour Moghaddam, Mostafa Yazdimamaghani, Hamidreza Ghandehari
Tunable glutathione (GSH)-sensitive hollow mesoporous silica nanoparticles (HMSiO2 NPs) were developed using a structural difference-based selective etching strategy. These organosilica hollow nanoparticles contained disulfide linkages (S-S) in the outer shell which were degraded by GSH. The particles were compared with their nonGSH-sensitive tetraethyl orthosilicate (TEOS) HMSiO2 counterparts in terms of their synthesis method, characterization, DOX release profile, and in vitro cytotoxicity in MCF-7 breast cancer cells...
April 18, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
Kin-Ho Law, Man-Wah Tsang, Yuk-Ki Wong, Ming-San Tsang, Pui-Yee Lau, Kwok-Yin Wong, Kwok-Ping Ho, Yun-Chung Leung
β-Lactamase inhibitory protein (BLIP), a low molecular weight protein from Streptomyces clavuligerus, has a wide range of potential applications in the fields of biotechnology and pharmaceutical industry because of its tight interaction with and potent inhibition on clinically important class A β-lactamases. To meet the demands for considerable amount of highly pure BLIP, this study aimed at developing an efficient expression system in eukaryotic Pichia pastoris (a methylotrophic yeast) for production of BLIP...
April 20, 2018: AMB Express
Cherukuri Sowmya, Vuppalapati Lavakumar, Narayanan Venkateshan, Velayutham Ravichandiran, D V R Saigopal
In our present investigation, synthesis of nontoxic, eco friendly and cost effective silver nanoparticles, Phyllanthus acidus (P. acidus) was used as starting material. The influence of phyto-constituents present in aqueous extracts of Phyllanthus acidus was found to be effective in reduction of silver nitrate to free silver nanoparticles (PA-AgNPs). HPTLC finger print analysis reveals the presence of flavonoid, quercetin in aqueous extracts of Phyllanthus acidus. Surface plasmon racemonance exhibited λ max at 462 nm through UV-Vis spectroscopy...
April 20, 2018: Chemistry Central Journal
Rekha Bhar, Gurpreet Kaur, S K Mehta
For the first time, drying pattern of a sessile droplet of genomic DNA, in the presence of hematite nanoparticles was sighted by polarizing optical microscopy (POM) in this research article. POM results indicated that only at an appreciably high concentration of hematite nanoparticles dried pattern of deoxyribonucleic acid from calf thymus (CT-DNA) was altered. Iron hybridized cetylpyridinium chloride was utilized for the preparation of iron oxide nanoparticles through hydrothermal method. Fourier transforms infrared spectroscopy (FTIR) and powder x-ray diffraction (PXRD) studies confirmed the formation of highly crystalline hematite i...
April 20, 2018: Scientific Reports
I M Leon, S D Lawhon, K N Norman, D S Threadgill, N Ohta, J Vinasco, H M Scott
Although Salmonella enterica can produce life-threatening colitis in horses, certain serotypes are more commonly associated with clinical disease. Our aim was to evaluate the proportional morbidity attributed to different serotypes, as well as phenotypic and genotypic antimicrobial resistance (AMR) of Salmonella isolated from patients at an equine referral hospital in the southern United States. Two-hundred-fifty-five Salmonella isolates were obtained from clinical samples of patients admitted to the hospital between 2007 and 2015...
April 20, 2018: Applied and Environmental Microbiology
Hossein Noormohammdi, Shamsozoha Abolmaali, Shakiba Darvish Alipour Astaneh
Drug-resistant Gram-positive pathogens have been a rising risk in hospitals and food industries from the last decades. Here in, the potential of endolysin production in Dasht Desert Bacterial Culture Collection (DDBCC), against indicator bacteria, was investigated. DDBCC was screened against autoclaved-indicator bacteria; Streptococcus faecalis, Streptococcus pyogenes, Bacillus sp, Bacillus subtilis and Staphylococcus aureus as the substrates for the endolysin enzymes. The endolysins were produced in BHI medium followed by ammonium sulfate purification...
April 17, 2018: Microbial Pathogenesis
E Gibbin, A Gavish, I Domart-Coulon, E Kramarsky-Winter, O Shapiro, A Meibom, A Vardi
BACKGROUND: Global warming has triggered an increase in the prevalence and severity of coral disease, yet little is known about coral/pathogen interactions in the early stages of infection. The point of entry of the pathogen and the route that they take once inside the polyp is currently unknown, as is the coral's capacity to respond to infection. To address these questions, we developed a novel method that combines stable isotope labelling and microfluidics with transmission electron microscopy (TEM) and nanoscale secondary ion mass spectrometry (NanoSIMS), to monitor the infection process between Pocillopora damicornis and Vibrio coralliilyticus under elevated temperature...
April 20, 2018: BMC Microbiology
Jeong Yeon Do, Byeong Sub Kwak, Misook Kang
In order to enhance the photoreduction of CO2 to CH4, a new type of photocatalyst, Sb1.5Sn8.5-xTixO19.0, with high conductivity and low bandgap was developed by partially incorporating Ti into the framework of Sb1.5Sn8.5O19.0 (antimony-doped tin oxide, ATO) using a controlled hydrothermal method. XRD and TEM analyses indicated that the Sb1.5Sn8.5-xTixO19.0 particles exhibited a tetragonal crystal structure and were approximately 20 nm in size. Furthermore, the bandgap and conductivity of these materials increased with increasing Ti content...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Kyeongae Nam, Yinsheng He, Keesam Shin
In this study we analyze the effect of shot peening on the microstructure and mechanical properties of Super304H, which is widely used for boiler tubes. Specimens were shot peened for 5, 10, and 15 minutes, and then heat treated at 600, 700, and 800 °C for 15 minutes. Vickers hardness was measured and the microstructure of cross sectional specimens was analyzed by scanning electron microscopy (SEM), electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM). Heat treatment led to particle refinement on the upper layer of Super304H...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Suhyun Kim, Moon Il Kim, Minyoung Shon, Bongkuk Seo, Choongsun Lim
Epoxy resins are widely used in various industrial fields due to their low cost, good workability, heat resistance, and good mechanical strength. However, they suffer from brittleness, an issue that must be addressed for further applications. To solve this problem, additional fillers are needed to improve the mechanical and thermal properties of the resins; zirconia is one such filler. However, it has been reported that aggregation may occur in the epoxy composites as the amount of zirconia increases, preventing enhancement of the mechanical strength of the epoxy composites...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Jinwoo Park, Mi Choi, Cheong-Soo Hwang
In this study, water-dispersible manganese (II) ion-doped ZnS nanocrystals (ZnS:Mn NCs) were synthesized by capping the surface with L-glycine molecules at various pH conditions. The UV-Visible and solution photoluminescence (PL) spectra showed broad peaks approximately at 330 and 590 nm, respectively. The calculated relative quantum efficiencies were in the range of 4.9∼5.8%, and the average particle sizes measured from the HR-TEM images were about 8 nm. Moreover, the surface charges of the corresponding ZnS:Mn-Gly NCs were determined by the electrophoretic method as: (-)14...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Bulgan Tsedenbal, Imad Hussain, M S Anwar, Bon Heun Koo
We report the morphological, structural and magnetic properties of the flower like iron oxide α-Fe2O3 samples prepared by the polyol method. The α-Fe2O3 samples were prepared by using different amount of the iron chloride in the starting materials and the impact of the different iron chloride amount on the morphology of the precursor and after heat treatment of the samples was investigated. The X-ray diffraction (XRD) analysis confirmed the formation of the α-Fe2O3 phase without detecting any impurity phase...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Bo-Kyung Choi, Woong-Ki Choi, Soo-Jin Park, Min-Kang Seo
In this study, we report Ag-TiO2/graphene oxide (GO) nanocomposites prepared by a simple one-pot synthesis using TiO2, AgNO3, and N-doped graphene (NDG). The NDG was synthesized using a microwave-assisted hydrothermal (MHT) method as a function of MHT time. The morphology and structure of Ag-TiO2/GO nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), Raman, and Fourier-transform infrared spectroscopy (FTIR). The photocatalytic activity of Ag-TiO2/GO nanocomposites in visible light was explored using the degradation, of methylene blue (MB) dye under the ultraviolet (UV) light...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Jinsuo Gao, Shouchun Wu, Yanling Han, Feng Tan, Yong Shi, Mengyao Liu, Xinyong Li
Increasing the amount of surface active sites of the material may be a feasible way to improve the efficiency ofthe generation of Fe2+ in the photo-Fenton process. In this work, a simple synthesis method was adopted to synthesize 3D ordered mesoporous CuFe2 O4 with large specific surface areaby using ferric nitrate and copper nitrate as the precursor and KIT-6 as the template. The synthesized materials were characterized by nitrogen adsorption-desorption, XRD, TEM, FT-IR and UV-vis DRS. The catalytic properties of the mesoporous material were thoroughly evaluated by activating hydrogen peroxide to remove sulfonamides in near neutral water...
April 1, 2018: Journal of Colloid and Interface Science
Liziane Oliveira Fonseca Monteiro, Angelo Malachias, Gwenaelle Pound-Lana, Rogerio Magalhães-Paniago, Vanessa Carla Furtado Mosqueira, Mônica Cristina Oliveira, Andre Branco de Barros, Elaine Amaral Leite
A long-circulating and pH-sensitive liposome containing PTX (SpHL-PTX) was recently developed by our group. Once at an acidic environment, e.g. tumor, these liposomes undergo destabilization releasing the encapsulated drug. In this way, the aim of this study was evaluate the molecular and supramolecular interactions between the lipid bilayer and PTX in similar biological environment conditions. High sensitivity analyses of SpHL-PTX structures were obtained by small angle X-ray scattering (SAXS) technique combined with other techniques such as DLS, AF4, TEM and HPLC...
April 20, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
F Rizzo, A Augieri, A Kursumovic, M Bianchetti, L Opherden, M Sieger, R Hühne, J Hänisch, A Meledin, G Van Tendeloo, J L MacManus-Driscoll, G Celentano
An outstanding current carrying performance (namely critical current density, Jc) over a broad temperature range of 10-77 K for magnetic fields up to 12 T is reported for films of YBa2Cu3O7-x with Ba2Y(Nb,Ta)O6 inclusion pinning centres (YBCO-BYNTO) and thicknesses in the range of 220-500 nm. Jc values of 10 MA cm-2 were measured at 30 K - 5 T and 10 K - 9 T with a corresponding maximum of the pinning force density at 10 K close to 1 TN m-3. The system is very flexible regarding properties and microstructure tuning, and the growth window for achieving a particular microstructure is wide, which is very important for industrial processing...
April 20, 2018: Nanoscale
Shao-Pu Tsai, Shih-Ning Tsai, Yu-Ting Tsai, Yu-Wen Chen, Po-Yen Tung, Jer-Ren Yang, Hsueh-Ren Chen, Chih-Yuan Chen, Yuan-Tsung Wang, Ching-Yuan Huang
Convergent beam electron diffraction (CBED) in transmission electron microscopy (TEM) was applied to determine local carbon concentrations in low-carbon transformation-induced plasticity (TRIP) steels. High-order Laue-zone (HOLZ) lines were experimentally obtained for comparison with simulation results. A new procedure for calculating carbon content is thus proposed. Retained austenite (RA) is classified into three types by morphology; the relationship between the carbon content and the corresponding RA morphology is discussed based on CBED results...
April 20, 2018: Microscopy Research and Technique
Chunhong Li, Hui Ruan, Dengming Chen, Kejian Li, Donglin Guo, Bin Shao
A Ni-based alloy was heat treated by changing the temperature and ambient atmosphere of the heat treatment. Morphology, crystal structure, and physical performance of the Ni-based alloy were characterized via SEM, XRD, TEM, and PPMS. Results show that due to the heat treatment process, the grain growth of the Ni-based alloy and the removal of impurities and defects are promoted. Both the orientation and stress caused by rolling are reduced. The permeability and saturation magnetization of the alloy are improved...
April 20, 2018: Microscopy Research and Technique
Hsien-Sheng Lin, Jen-Bin Shi, Cheng-Ming Peng, Bo-Chi Zheng, Fu-Chou Cheng, Ming-Way Lee, Hsuan-Wei Lee, Po-Feng Wu, Yi-Jui Liu
In this study, alpha nickel sulfide (α-NiS) nanosphere films have been successfully synthesized by electroplating the nickel nanosheet film on the indium tin oxide (ITO) glass substrate and sulfuring nickel-coated ITO glass substrate. First, we electrodeposited the nickel nanosheet films on the ITO glass substrates which were cut into a 0.5 × 1 cm2 size. Second, the nanosheet nickel films were annealed in vacuum-sealed glass ampoules with sulfur sheets at different annealing temperatures (300, 400, and 500 °C) for 4 h in vacuum-sealed glass ampoules...
April 19, 2018: Nanoscale Research Letters
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