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https://www.readbyqxmd.com/read/28351128/nanoparticles-of-titanium-and-zinc-oxides-as-novel-agents-in-tumor-treatment-a-review
#1
Janusz Bogdan, Joanna Pławińska-Czarnak, Joanna Zarzyńska
Cancer has become a global problem. On all continents, a great number of people are diagnosed with this disease. In spite of the progress in medical care, cancer still ends fatal for a great number of the ill, either as a result of a late diagnosis or due to inefficiency of therapies. The majority of the tumors are resistant to drugs. Thus, the search for new, more effective therapy methods continues. Recently, nanotechnology has been attributed with big expectations in respect of the cancer fight. That interdisciplinary field of science creates nanomaterials (NMs) and nanoparticles (NPs) that can be applied, e...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28351127/absorption-amelioration-of-amorphous-si-film-by-introducing-metal-silicide-nanoparticles
#2
Hui Sun, Hsuan-Chung Wu, Sheng-Chi Chen, Che-Wei Ma Lee, Xin Wang
Amorphous Si (a-Si) films with metal silicide are expected to enhance the absorption ability of pure a-Si films. In this present study, NiSi (20 nm)/Si (40 nm) and AlSi (20 nm)/Si (40 nm) bilayer thin films are deposited through radio frequency (RF) sputtering at room temperature. The influence of the film's composition and the annealing temperature on the film's optical absorption is investigated. The results show that all the NiSi/Si films and AlSi/Si films possess higher absorption ability compared to a pure a-Si film (60 nm)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28351016/nano-enabled-paper-humidity-sensor-for-mobile-based-point-of-care-lung-function-monitoring
#3
Mitradip Bhattacharjee, Harshal B Nemade, Dipankar Bandyopadhyay
The frequency of breathing and peak flow rate of exhaled air are necessary parameters to detect chronic obstructive pulmonary diseases (COPDs) such as asthma, bronchitis, or pneumonia. We developed a lung function monitoring point-of-care-testing device (LFM-POCT) consisting of mouthpiece, paper-based humidity sensor, micro-heater, and real-time monitoring unit. Fabrication of a mouthpiece of optimal length ensured that the exhaled air was focused on the humidity-sensor. The resistive relative humidity sensor was developed using a filter paper coated with nanoparticles, which could easily follow the frequency and peak flow rate of the human breathing...
March 22, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28351007/catalytic-role-of-iron-in-the-formation-of-silver-nanoparticles-in-photo-irradiated-ag-dissolved-organic-matter-solution
#4
Yongguang Yin, Dan Han, Chao Tai, Zhiqiang Tan, Xiaoxia Zhou, Sujuan Yu, Jingfu Liu, Guibin Jiang
Photo-reduction of Ag(+) to silver nanoparticle (AgNPs) by dissolved organic matter (DOM) is a possible source of naturally occurring AgNPs. However, how this photo-reduction process is influenced by ubiquitous metal ions is still not well understood. In addition, in previous studies, the formation of AgNPs in DOM solution was usually monitored by UV-Vis spectroscopy, and there is still lack of quantitative analysis for the formed AgNPs. In the present study, the role of Fe(2+)/Fe(3+) at environmental concentration level on this photochemical process was investigated, and the enhanced formation of AgNPs by Fe(2+)/Fe(3+) was probed and quantified by using UV-Vis spectroscopy, transmission electron microscopy, and liquid chromatography-inductively coupled plasma mass spectrometry...
March 25, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28351005/nrf-2-driven-long-noncoding-rna-odrul-contributes-to-modulating-silver-nanoparticle-induced-effects-on-erythroid-cells
#5
Ming Gao, Beibei Zhao, Minjun Chen, Yun Liu, Ming Xu, Zhe Wang, Sijin Liu, Chengdong Zhang
The biosafety and biological effects of silver nanoparticles (AgNPs) on human health attract increasing concern. Although considerable studies have been performed to reveal the molecular mechanisms responsible for AgNP-induced effects, the current understanding mainly focuses on oxidative stress-associated signaling pathways activated by Ag particles and/or Ag ions. However, the molecular bases underlying the activation of these stress signaling pathways have not been thoroughly elucidated yet. In the current study, we aimed to shed light on the molecular bases of AgNP-induced effects on erythroid cells from the perspective of long noncoding RNAs...
March 22, 2017: Biomaterials
https://www.readbyqxmd.com/read/28351000/targeted-superparamagnetic-nanoparticles-coated-with-2-deoxy-d-gloucose-and-doxorubicin-more-sensitize-breast-cancer-cells-to-ionizing-radiation
#6
Jalil Pirayesh Islamian, Milad Hatamian, Negar Abbasi Aval, Mohammad Reza Rashidi, Asghar Mesbahi, Mohammad Mohammadzadeh, Mohammad Asghari Jafarabadi
INTRODUCTION: Nanoparticles are promising as a new approach to enhance chemo- radiotherapy efficiency in breast cancer mainly via targeted therapy. MATERIALS & METHODS: SKBR3 and T47D breast cancer cells were treated with superparamagnetic mesoporous hydroxyapatite nanocomposites (SPmHANs)conjugated with 1 μM doxorubicin and 0.5 mM 2-Deoxy-d-Glucose and irradiated with 1 and 2 Gy gamma rays in vitro. The treatment toxicity and also the apoptosis/necrosis ratio were measured by MTT assay and also ELISA cell death detection PLUS, respectively...
March 25, 2017: Breast: Official Journal of the European Society of Mastology
https://www.readbyqxmd.com/read/28350964/promoting-vaginal-distribution-of-e7-and-mcl-1-sirna-silencing-nanoparticles-for-cervical-cancer-treatment
#7
Anna Lechanteur, Tania Furst, Brigitte Evrard, Philippe Delvenne, Geraldine Piel, Pascale Hubert
There is an urgent need to develop a less aggressive and more effective treatment against cervical lesions induced by different high-risk human papillomavirus (HR-HPV). We investigated the potential of a cocktail of small interfering RNA (siRNA) directed against the oncoprotein E6 (E6), the oncoprotein E7 (E7) and/or the anti-apoptotic protein MCL-1 (MCL-1). The combination of siRNA anti-E7 and anti-MCL-1 demonstrated high efficacy on multiple HPV16 and HPV18 cell lines and no effects on healthy keratinocytes...
March 28, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28350963/gd-dots-with-strong-ligand-water-interaction-for-ultrasensitive-magnetic-resonance-renography
#8
Xiao-Yu Zheng, Kai Zhao, Jinglong Tang, Xin-Yu Wang, Lin-Dong Li, Nai-Xiu Chen, Yan-Jie Wang, Shuo Shi, Xiaodong Zhang, Sivakumar Malaisamy, Ling-Dong Sun, Xiaoying Wang, Chunying Chen, Chun-Hua Yan
Magnetic resonance imaging (MRI) contrast agents (CAs) with both significantly enhanced relaxivity and minimal safety risk are of great importance for sensitive clinical diagnosis, which, however, have rarely been reported. Herein, we present a simple strategy to improve relaxivity by introducing surface ligands with strong interaction to water molecules. As a proof of concept, NaGdF4 nanoparticles (NPs) capped by polyacrylic acid (PAA) show superior relaxivity to those capped by polyethylenimine (PEI) and polyethylene glycol (PEG), which is attributed to the strong hydrogen bond capacity of PAA to water molecules as revealed by theoretical calculation...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28350958/photo-controlled-sirna-delivery-and-biomarker-triggered-aiegen-emission-by-upconversion-nayf4-yb-3-tm-3-sio2-nanoparticles-for-inducing-and-monitoring-stem-cell-differentiation
#9
Jinming Li, Chris Wai Tung Leung, Dexter Siu Hong Wong, Jianbin Xu, Rui Li, Yueyue Zhao, Chris Yu Yee Yung, Engui Zhao, Benzhong Tang, Liming Bian
Controlling differentiation of stem cell and monitoring the cell differentiation has attracted much research interest since the discovery of stem cells. In this regard, a novel and personalized near-infrared (NIR) light-activated nanoplatform is obtained by encapsulating the photoactivated caged compound (DMNPE/siRNA) and combining a MMP13 cleavaged imaging peptide-tetrapheny-lethene (TPE) unit conjugated with the mesoporous silica coated upconversion nanoparticles (UCNPs) for the remote control of cell differentiation and simultaneously for real-time monitoring of differentiation...
March 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28350664/human-adipose-derived-stem-cells-labeled-with-plasmonic-gold-nanostars-for-cellular-tracking-and-photothermal-cancer-cell-ablation
#10
Ronnie L Shammas, Andrew M Fales, Bridget M Crawford, Amy J Wisdom, Gayathri R Devi, David A Brown, Tuan Vo-Dinh, Scott T Hollenbeck
BACKGROUND: Gold nanostars are unique nanoplatforms that can be imaged in real time and transform light energy into heat to ablate cells. Adipose-derived stem cells migrate toward tumor niches in response to chemokines. The ability of adipose-derived stem cells to migrate and integrate into tumors makes them ideal vehicles for the targeted delivery of cancer nanotherapeutics. METHODS: To test the labeling efficiency of gold nanostars, undifferentiated adipose-derived stem cells were incubated with gold nanostars and a commercially available nanoparticle (Qtracker), then imaged using two-photon photoluminescence microscopy...
April 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28350448/mechanism-exploration-of-ion-transport-in-nanocomposite-cation-exchange-membranes
#11
Xin Tong, Bopeng Zhang, Yilin Fan, Yongsheng Chen
The origin of property enhancement of nanocomposite ion exchange membranes (IEMs) is far from being fully understood. By combining experimental work and computational modeling analysis, we could determine the influence of nanomaterials on the ion transport properties of nanocomposite cation exchange membranes (CEMs). We synthesized and characterized a series of nanocomposite CEMs by using SPPO as polymer materials and silica nanoparticles (NPs) (unsulfonated or sulfonated) as nanomaterials. We found that with the increase of NP loading, measured CEM permselectivity and swelling degree first increased and then decreased...
March 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28350447/self-functionalization-behind-a-solution-processed-niox-film-used-as-hole-transporting-layer-for-efficient-perovskite-solar-cells
#12
John Ciro, Daniel Ramírez, Mario Alejandro Mejía Escobar, Juan Felipe Montoya, Santiago Mesa, Rafael Betancur, Franklin Jaramillo
Fabrication of solution-processed perovskite solar cells (PSCs) requires the deposition of high quality films from precursor inks. Frequently, buffer layers of PSCs are formed from dispersions of metal oxide nanoparticles (NPs). Therefore, the development of trustable methods for the preparation of stable colloidal NPs dispersions is crucial. In this work, a novel approach to form very compact semiconducting buffer layers with suitable optoelectronic properties is presented through a self-functionalization process of the nanocrystalline particles by their own amorphous phase and without adding any other inorganic or organic functionalization component or surfactant...
March 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28350442/engineered-polymer-transferrin-conjugates-as-self-assembling-targeted-drug-delivery-systems
#13
Hiteshri Makwana, Francesca Mastrotto, Johannes Pall Magnusson, Darrell Sleep, Joanna Hay, Karl J Nicholls, Stephanie Allen, Cameron Alexander
Polymer-protein conjugates can be engineered to self-assemble into discrete and well-defined drug delivery systems which combine the advantages of receptor targeting and controlled drug release. We designed specific conjugates of the iron-binding and transport protein, transferrin (Tf), to combine the advantages of this serum-stable protein as a targeting agent for cancer cells with self-assembling polymers to act as carriers of cytotoxic drugs. Tf variants were expressed with cysteine residues at sites spanning different regions of the protein surface and the polymer conjugates grown from these variants were compared with polymer conjugates grown from non-selectively derivatised sites on native Tf...
March 28, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28350439/correction-to-trends-in-adhesion-energies-of-metal-nanoparticles-on-oxide-surfaces-understanding-support-effects-in-catalysis-and-nanotechnology
#14
Stephanie L Hemmingson, Charles T Campbell
No abstract text is available yet for this article.
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28350437/bacteria-activated-theranostic-nanoprobes-against-methicillin-resistant-staphylococcus-aureus-infection
#15
Zhiwei Zhao, Rong Yan, Xuan Yi, Jingling Li, Jiaming Rao, Zhengqing Guo, Yanmei Yang, Weifeng Li, Yong-Qiang Li, Chunying Chen
Despite numerous advanced imaging and sterilization techniques available nowadays, the sensitive in vivo diagnosis and complete elimination of drug-resistant bacterial infections remain to be big challenge. Here we report a strategy to design activatable theranostic nanoprobes against methicillin-resistant Staphylococcus aureus (MRSA) infections. This probe is based on silica nanoparticles coated with vancomycin-modified polyelectrolyte-cypate complexes (SiO2-Cy-Van), which is activated by an interesting phenomenon of bacteria-responsive dissociation of the polyelectrolyte from silica nanoparticles...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28350433/scalable-fabrication-of-photochemically-reduced-graphene-based-monolithic-micro-supercapacitors-with-superior-energy-and-power-densities
#16
Sen Wang, Zhong-Shuai Wu, Shuanghao Zheng, Feng Zhou, Chenglin Sun, Hui-Ming Cheng, Xinhe Bao
Micro-supercapacitors (MSCs) hold great promise as highly competitive miniaturized power sources satisfying the increased demand of smart integrated electronics. However, single-step scalable fabrication of MSCs with both high energy and power densities is still challenging. Here we demonstrate the scalable fabrication of graphene-based monolithic MSCs with diverse planar geometries and capable of superior integration by photochemical reduction of graphene oxide/TiO2 nanoparticle hybrid films. The resulting MSCs exhibit high volumetric capacitance of 233...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28347131/preclinical-in-vivo-cancer-straightway-to-patients
#17
Marion de Jong, Stephen Mather, Theodosia Maina
Detection of useful cellular targets has strongly stimulated personalized tumor-targeted imaging and therapy approaches, also involving synthesis and evaluation of nuclear imaging probes with potential for clinical applications. Reviews of preclinical and translational studies concerning such probes, including radiolabeled antibodies, nanobodies, affibodies, peptides, small molecule inhibitors, and nanoparticles, are presented in this issue. As most tracers described in these articles have been developed for the field of cancer imaging and radionuclide therapy, the current article on preclinical studies will focus on cancer research as well...
June 2017: Quarterly Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28346902/in-situ-synthesis-of-cobalt-ferrites-embedded-hollow-n-doped-carbon-as-an-outstanding-catalyst-for-elimination-of-organic-pollutants
#18
Tao Zeng, Mingdong Yu, Haiyan Zhang, Zhiqiao He, Xiaole Zhang, Jianmeng Chen, Shuang Song
Using polydopamine-metal ions complex as precursor, hollow mesoporous N-doped carbon microspheres encapsulating spinel ferrites nanocrystals (HM-NC/CoFe2O4) were facilely prepared with the aim of creating a novel heterogeneous catalyst for sulfate radical-based oxidation of organic contaminants. The surface morphology, structure and composition of HM-NC/CoFe2O4 catalyst were thoroughly investigated. The applicability of the catalyst was systematically assessed through numerous controlled trials, several operating parameters, as well as different model pollutants by means of peroxymonosulfate (PMS) activation...
March 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28346827/effects-of-cerium-oxide-and-ferrocene-nanoparticles-addition-as-fuel-borne-catalysts-on-diesel-engine-particulate-emissions-environmental-and-health-implications
#19
Zhi-Hui Zhang, Rajasekhar Balasubramanian
This study systematically examined the potential impacts of doping CeO2 and Fe(C5H5)2 nanoparticles as fuel-borne catalysts (FBCs) to ultralow sulfur diesel (ULSD) fuel on the physical, chemical and toxicological characteristics of diesel particulate matter (DPM). The FBCs-doped fuels are effective in promoting soot oxidation and reducing the DPM mass emissions, but lead to a significant increase in the total particle counts due to the formation of self-nucleated metallic nanoparticles. Compared to undoped ULSD, the FBCs-doped fuels result in higher concentrations of particle-phase polycyclic aromatic hydrocarbons (PAHs) and n-alkanes, higher fractions of organic carbon (OC) and water-soluble organic carbon (WSOC) in particles, show slight alterations in soot nanostructure, reduce soot ignition temperature and activation energy...
March 27, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28346388/thermal-condensation-of-glycine-and-alanine-on-metal-ferrite-surface-primitive-peptide-bond-formation-scenario
#20
Md Asif Iqubal, Rachana Sharma, Sohan Jheeta, Kamaluddin
The amino acid condensation reaction on a heterogeneous mineral surface has been regarded as one of the important pathways for peptide bond formation. Keeping this in view, we have studied the oligomerization of the simple amino acids, glycine and alanine, on nickel ferrite (NiFe₂O₄), cobalt ferrite (CoFe₂O₄), copper ferrite (CuFe₂O₄), zinc ferrite (ZnFe₂O₄), and manganese ferrite (MnFe₂O₄) nanoparticles surfaces, in the temperature range from 50-120 °C for 1-35 days, without applying any wetting/drying cycles...
March 27, 2017: Life
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