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https://www.readbyqxmd.com/read/28432996/toxicological-effects-of-phenol-on-four-marine-microalgae
#1
Weiyan Duan, Fanping Meng, Yufei Lin, Guoshan Wang
The toxic effects of phenol on four marine microalgae (Dunaliella salina, Platymonas subcordiformis, Phaeodactylum tricornutum Bohlin, and Skeletonema costatum) were evaluated. The 96h EC50 values were 72.29, 92.97, 27.32, and 27.32mgL(-1), respectively, which were lower than those values of freshwater microalgae reported in the literature. During a 96-h exposure to a sub-lethal concentration of phenol (1/2 96h EC50) with green alga (D. salina) and diatom (S. costatum), reactive oxygen species (ROS) accumulation, and chlorophyll a (Chl a) content decrease were simultaneously observed in diatom cells after 48h treatment...
April 13, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28432916/colorimetric-method-for-the-detection-of-melamine-using-in-situ-formed-silver-nanoparticles-via-tannic-acid
#2
Md Fazle Alam, Amaj Ahmed Laskar, Shahbaz Ahmed, Mohd Azfar Shaida, Hina Younus
Melamine toxicity has recently attracted worldwide attention as it causes renal failure and the death of humans and animals. Therefore, developing a simple, fast and sensitive method for the routine detection of melamine is the need of the hour. Herein, we have developed a selective colorimetric method for the detection of melamine in milk samples based upon in-situ formation of silver nanoparticles (AgNPs) via tannic acid. The AgNPs thus formed were characterized by UV-Visible spectrophotometer, transmission electron microscope (TEM), zetasizer and dynamic light scattering (DLS)...
April 17, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28432905/statistical-analysis-of-dislocations-and-dislocation-boundaries-from-ebsd-data
#3
C Moussa, M Bernacki, R Besnard, N Bozzolo
Electron BackScatter Diffraction (EBSD) is often used for semi-quantitative analysis of dislocations in metals. In general, disorientation is used to assess Geometrically Necessary Dislocations (GNDs) densities. In the present paper, we demonstrate that the use of disorientation can lead to inaccurate results. For example, using the disorientation leads to different GND density in recrystallized grains which cannot be physically justified. The use of disorientation gradients allows accounting for measurement noise and leads to more accurate results...
April 14, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28432799/the-transformation-of-hybrid-silica-nanoparticles-from-solid-to-hollow-or-yolk-shell-nanostructures
#4
Xingwen Liu, Guangren Qian, Zheng Jiao, Minghong Wu, Haijiao Zhang
Here, a facile self-templating approach has been presented for synthesis of hollow and yolk-shell mesoporous silica nanoparticles (HMSNs and YMSNs) through a selective etching of hybrid silica nanoparticles. The hybrid silica nanoparticles are from the co-condensation of tetraethylorthosilicate (TEOS) and N-[3-(trimethoxysilyl)propyl]ethylenediamine (TSD) by a simple one-step process. Two kinds of products including HMSNs and YMSNs can be easily prepared only by tuning the TSD amounts in the precursor. Significantly, the transformation of hollow structure does not use any sacrificial template and surface protective agent...
April 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28432501/high-scale-yield-of-nano-hydroxyapatite-through-combination-of-mechanical-activation-and-chemical-dispersion
#5
Xueling Gao, Chunchu Dai, Weiwei Liu, Yumei Liu, Ru Shen, Xiaotong Zheng, Ke Duan, Jie Weng, Shuxin Qu
The aim of this study is to develop a simple, convenient and effective approach to synthesize nano-sized hydroxyapatite (nano-HA) at high-scale yield. Nano-HA was wet synthesized in the presence or absence of alendronate sodium (ALN), one of bisphosphonates for anti-osteoporotic. Then aged and washed nano-HA precipitate was directly treated by mechanical activation combined with the chemical dispersion of ALN to prevent the agglomeration of nano-HA. ALN acted not only as a chemical dispersant but also as an orthopedic drug...
June 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28431942/chitosan-based-nanocomplexes-for-simultaneous-loading-burst-reduction-and-controlled-release-of-doxorubicin-and-5-fluorouracil
#6
Antonio Di Martino, Pavel Kucharczyk, Zdenka Capakova, Petr Humpolicek, Vladimir Sedlarik
In this work, nanocomplexes based on chitosan grafted by carboxy-modified polylactic acid (SPLA) were prepared with the aim of loading simultaneously two anticancer drugs - doxorubicin and 5-fluorouracil, as well as to control their release, reduce the initial burst and boost cytotoxicity. The SPLA was prepared by a polycondensation reaction, using pentetic acid as the core molecule, and linked to the chitosan backbone through a coupling reaction. Nanocomplexes loaded with both drugs were formulated by the polyelectrolyte complexation method...
April 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28431925/analysis-of-pm2-5-induced-cytotoxicity-in-human-hacat-cells-based-on-a-microfluidic-system
#7
Yuxiao Zhang, Lulu Zheng, Jiang Tuo, Qi Liu, Xinlian Zhang, Zhixuan Xu, Sixiu Liu, Guodong Sui
Human exposure to PM2.5 causes several adverse health effects. Skin is the first barrier against harmful environmental substances and can has direct contact with PM2.5, but there is no study about PM2.5-induced cytotoxicity in human skin cells on the molecular level partially due to the shortcomings of traditional research methods. In present study, we established a microfluidic system including a cell culture chip integrated with a high-throughput protein microarray chip to investigate the mechanism of PM2...
April 18, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28431459/direct-growth-of-al2o3-on-black-phosphorus-by-plasma-enhanced-atomic-layer-deposition
#8
B B Wu, H M Zheng, Y Q Ding, W J Liu, H L Lu, P Zhou, L Chen, Q Q Sun, S J Ding, David W Zhang
Growing high-quality and uniform dielectric on black phosphorus is challenging since it is easy to react with O2 or H2O in ambient. In this work, we have directly grown Al2O3 on BP using plasma-enhanced atomic layer deposition (PEALD). The surface roughness of BP with covered Al2O3 film can reduce significantly, which is due to the removal of oxidized bubble in BP surface by oxygen plasma. It was also found there is an interfacial layer of PO x in between amorphous Al2O3 film and crystallized BP, which is verified by both X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) measurements...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28431297/nano-zirconia-evaluation-of-its-antioxidant-and-anticancer-activity
#9
Siripireddy Balaji, Badal Kumar Mandal, Shivendu Ranjan, Nandita Dasgupta, Ramalingam Chidambaram
Bioactivity of nanomaterials largely depends on its size, shape and crystalline nature. In this work, the smaller sized spherical shaped nano-zirconia (ZrO2 NPs) (of ~9 to 11nm) was fabricated and studied its biological activity especially antioxidant and cytotoxicity against human colon carcinoma (HCT-116) and human lung carcinoma (A-549) cell lines. To have its real applications in biological aspects readily available Eucalyptus globulus (E. globulus) leaf extract was used as an effective capping and reducing agent for its synthesis...
April 8, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28430448/structural-and-rheological-properties-of-temperature-responsive-amphiphilic-triblock-copolymers-in-aqueous-media
#10
Josefine Eilsø Nielsen, Kaizheng Zhu, Sverre Arne Sande, Lubomír Kováčik, Dušan Cmarko, Kenneth Dahl Knudsen, Bo Nyström
Thermoresponsive amphiphilic biodegradable block copolymers of the type poly(-caprolactone-co-lactide)-poly(ethylene glycol)-poly(-caprolactone-co-lactide) (PCLA-PEGm-PCLA) have great potential for various biomedical applications. In the present study, we have surveyed the effects of PEG-spacer length (m=1000 and 1500), temperature, and polymer concentration on the self-assembling process to form supramolecular structures in aqueous solutions of the PCLA-PEGm-PCLA copolymer. This copolymer has a lower critical solution temperature, and the cloud point depends on both concentration and PEG-length...
April 21, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28430134/on-the-morphology-of-group-ii-metal-fluoride-nanocrystals-at-finite-temperature-and-partial-pressure-of-hf
#11
Zeinab Kaawar, Stefan Mahn, Erhard Kemnitz, Beate Paulus
We have investigated the bulk and surface properties of the group II metal fluorides CaF 2 , SrF 2 and BaF 2 using periodic density functional theory (DFT) calculations and surface thermodynamics. Our bulk results show that the best agreement with experiment is achieved with the B3LYP and PBE functionals. We determined the relative importance of the low index surfaces in vacuum and found that an fluoride microcrystal exposes only the (111) surface in which the undercoordinated cations are sevenfold coordinated...
April 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28430121/synthesis-characterization-and-enhanced-sensing-properties-of-a-nio-zno-p-n-junctions-sensor-for-the-sf%C3%A2-decomposition-byproducts-so%C3%A2-so%C3%A2-f%C3%A2-and-sof%C3%A2
#12
Hongcheng Liu, Qu Zhou, Qingyan Zhang, Changxiang Hong, Lingna Xu, Lingfeng Jin, Weigen Chen
The detection of partial discharge and analysis of the composition and content of sulfur hexafluoride SF₆ gas components are important to evaluate the operating state and insulation level of gas-insulated switchgear (GIS) equipment. This paper reported a novel sensing material made of pure ZnO and NiO-decorated ZnO nanoflowers which were synthesized by a facile and environment friendly hydrothermal process for the detection of SF₆ decomposition byproducts. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) were used to characterize the structural and morphological properties of the prepared gas-sensitive materials...
April 21, 2017: Sensors
https://www.readbyqxmd.com/read/28429831/one-step-fabrication-of-monolithic-electrodes-comprising-co9s8-particles-supported-on-cobalt-foam-for-efficient-and-durable-oxygen-evolution-reaction
#13
Dehua Xiong, Qingqing Zhang, Sitaramanjaneya Mouli Thalluri, Junyuan Xu, Wei Li, Xiuli Fu, Lifeng Liu
We report a very easy and cost-effective approach to the fabrication of monolithic Co9S8 water oxidation electrodes (Co@Co9S8), which is fabricated by one-step hydrothermal treatment of commercially available cobalt foam in the presence of thiourea. The morphology, crystal structure, microstructure, and composition of as-fabricated Co@Co9S8 electrodes are examined using scanning electron microscopy (SEM), powder X-ray diffraction (XRD), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS), and their electrochemical properties are investigated by cyclic voltammetry (CV), chronopotentiometry (CP), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS)...
April 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28429812/hollow-hematite-single-crystals-deposited-with-ultra-thin-al2o3-by-atom-layer-deposition-for-improved-photoelectrochemical-performance
#14
Wei Jiao, Jingrui Wu, Siwen Cui, Ning Wei, Zia Ur Rahman, Meiyan Yu, Shougang Chen, Yangtao Zhou, Daoai Wang
Hematite (α-Fe2O3) is a red material with a band gap of about 2.0 eV, which indicates that it can absorb more solar light. It is a promising photocatalyst applied in many fields. In this paper, α-Fe2O3 single crystal hollow hexagonal bipyramids were synthesized by a simple one-pot hydrothermal method. The morphology and structure of the prepared α-Fe2O3 hollow hexagonal bipyramids were studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The hollow single crystals show a good light absorption and performance in photodegradation of methylene blue (MB)...
April 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28429740/micelle-template-synthesis-of-hollow-silica-spheres-for-improving-water-vapor-permeability-of-waterborne-polyurethane-membrane
#15
Yan Bao, Tong Wang, Qiaoling Kang, Chunhua Shi, Jianzhong Ma
Hollow silica spheres (HSS) with special interior spaces, high specific surface area and excellent adsorption and permeability performance were synthesized via micelle-template method using cetyl trimethyl ammonium bromide (CTAB) micelles as soft template and tetraethoxysilane (TEOS) as silica precursor. SEM, TEM, FT-IR, XRD, DLS and BET-BJH were carried out to characterize the morphology and structure of as-obtained samples. The results demonstrated that the samples were amorphous with a hollow structure and huge specific surface area...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28429736/single-step-one-pot-synthesis-of-tio2-nanosheets-doped-with-sulfur-on-reduced-graphene-oxide-with-enhanced-photocatalytic-activity
#16
Weilin Wang, Zhaofeng Wang, Jingjing Liu, Zhu Luo, Steven L Suib, Peng He, Guqiao Ding, Zhengguo Zhang, Luyi Sun
A hybrid photocatalyst based on anatase TiO2 was designed by doping TiO2 with sulfur and incorporating reduced graphene oxide (TiO2-S/rGO hybrid), with an aim to narrow the band gap to potentially make use of visible light and decrease the recombination of excitons, respectively. This TiO2-S/rGO hybrid was successfully synthesized using a one-pot hydrothermal method via single-step reaction. The structure and morphology of the TiO2-S/rGO hybrid catalyst was carefully characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS)...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28429122/quantifying-golgi-structure-using-em-combining-volume-sem-and-stereology-for-higher-throughput
#17
REVIEW
Sophie Ferguson, Anna M Steyer, Terry M Mayhew, Yannick Schwab, John Milton Lucocq
Investigating organelles such as the Golgi complex depends increasingly on high-throughput quantitative morphological analyses from multiple experimental or genetic conditions. Light microscopy (LM) has been an effective tool for screening but fails to reveal fine details of Golgi structures such as vesicles, tubules and cisternae. Electron microscopy (EM) has sufficient resolution but traditional transmission EM (TEM) methods are slow and inefficient. Newer volume scanning EM (volume-SEM) methods now have the potential to speed up 3D analysis by automated sectioning and imaging...
April 20, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28429009/aggregation-of-cyclic-polypeptoids-bearing-zwitterionic-end-groups-with-attractive-dipole-dipole-and-solvophobic-interactions-a-study-by-small-angle-neutron-scattering-and-molecular-dynamics-simulation
#18
Pu Du, Ang Li, Xin Li, Yueheng Zhang, Changwoo Do, Lilin He, Steven W Rick, Vijay T John, Revati Kumar, Donghui Zhang
Aggregation behavior of cyclic polypeptoids bearing zwitterionic end-groups in methanol has been studied using a combination of experimental and simulation techniques. The data from SANS and cryo-TEM indicate that the solution contains small clusters of these cyclic polypeptoids, ranging from a single polypeptoid chain to small oligomers, while the linear counterpart shows no cluster formation. Atomistic molecular dynamics simulations reveal that the driving force for this clustering behavior is due to the interplay between the effective repulsion due to the solvation of the dipoles formed by the charged end-groups in each polypeptoid chain and the attractive forces due to dipole-dipole interactions and the solvophobic effect...
April 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28428773/mutation-at-g103-of-mtbftsz-altered-their-sensitivity-to-coumarins
#19
Duggirala Sridevi, Karpagam U Sudhakar, Ragamanvitha Ananthathatmula, Rakesh P Nankar, Mukesh Doble
Coumarins are natural polyphenol lactones comprising of fused rings of benzene and α-pyrone. The current study demonstrates the inhibitory effect of coumarins with various substitutions on Mycobacterium smegmatis mc(2) 155. We also demonstrate the effect of pomegranate (Punica granatum) extract containing ellagic acid, on M. smegmatis as well as their affect on MtbFtsZ (FtsZ from Mycobacterium tuberculosis). The ellagic acid extracts from pomegranate peels inhibit mycobacteria with a MIC of 25 μM and 0.3 to 3...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28428694/a-microarray-immunoassay-for-serum-thyrotropin-and-thyroglobulin-using-antibodies-immobilized-on-track-etched-membranes
#20
Bharti Jain, J Kumarasamy, Chandrakala Gholve, Savita Kulkarni, M G R Rajan
Serum thyroglobulin (Tg) and thyroid stimulating hormone (TSH) measurements have evolved as important analytes for monitoring the prognosis of patients with differentiated thyroid cancer, post-thyroidectomy. Individual analyte immunoassay is the current practice in clinical pathology, but the simultaneous assay for all relevant analytes for a given disease, can reduce assay costs, improve patient compliance and give the clinician more information for an unequivocal diagnosis. Microarray immunoassay (MI) can achieve this goal and, hence, we have developed and validated a immuno-radiometric MI for quantitation of serum TSH and Tg by using highly micro-porous polycarbonate (PC) track-etched membranes (TEM) to immobilize the monoclonal anti-TSH and polyclonal anti-Tg antibodies in ~1 mm diameter spots...
June 2017: Indian Journal of Clinical Biochemistry: IJCB
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