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Gold response

Tae Soup Shim, Zaki G Estephan, Zhaoxia Qian, Jacob H Prosser, Su Yeon Lee, David M Chenoweth, Daeyeon Lee, So-Jung Park, John C Crocker
Active materials that respond to physical and chemical stimuli can be used to build dynamic micromachines that lie at the interface between biological systems and engineered devices. In principle, the specific hybridization of DNA can be used to form a library of independent, chemically driven actuators for use in such microrobotic applications and could lead to device capabilities that are not possible with polymer- or metal-layer-based approaches. Here, we report shape changing films that are powered by DNA strand exchange reactions with two different domains that can respond to distinct chemical signals...
October 24, 2016: Nature Nanotechnology
Han Yu, Quan Sun, Kosei Ueno, Tomoya Oshikiri, Atsushi Kubo, Yasutaka Matsuo, Hiroaki Misawa
The extraordinary optical properties of coupled plasmonic nanostructures make these materials potentially useful in many applications; thus, they have received enormous attentions in basic and applied research. Coupled plasmon modes have been characterized predominantly using far-field spectroscopy. In near-field spectroscopy, the spectral response of local field enhancement in coupled plasmonic nanostructures remains largely unexplored, especially experimentally. Here, we investigate the coupled gold dolmen nanostructures in the near field using photoemission electron microscopy (PEEM), with wavelength-tunable femtosecond laser pulses as an excitation source...
October 24, 2016: ACS Nano
Xueling Feng, Kaihuan Zhang, Peng Chen, Xiaofeng Sui, Mark A Hempenius, Bo Liedberg, G Julius Vancso
Highly swellable, dual-responsive hydrogels, consisting of thermo-responsive poly(N-isopropylacrylamide) (PNIPAM) and redox-responsive poly(ferrocenylsilane) (PFS) based poly(ionic liquid)s (PILs) are formed by photo-polymerization. PFS chains bearing cross-linkable vinylimidazolium (VIm) side groups are copolymerized with NIPAM in aqueous solutions under ultraviolet light (λ = 365 nm) in the presence of a photoinitiator. The PFS-PILs serve as a macro-cross-linker and also provide redox responsiveness. The swelling ratio, morphology, and lower critical solution temperature (LCST) of the hydrogels are studied as a function of the PNIPAM/PFS ratio...
October 24, 2016: Macromolecular Rapid Communications
M H Kuniholm, X Xie, K Anastos, X Xue, L Reimers, A L French, S J Gange, S G Kassaye, A Kovacs, T Wang, B E Aouizerat, H D Strickler
Human leucocyte antigen (HLA) genes play a central role in response to pathogens and in autoimmunity. Research to understand the effects of HLA genes on health has been limited because HLA genotyping protocols are labour intensive and expensive. Recently, algorithms to impute HLA genotype data using genome-wide association study (GWAS) data have been published. However, imputation accuracy for most of these algorithms was based primarily on training data sets of European ancestry individuals. We considered performance of two HLA-dedicated imputation algorithms - SNP2HLA and HIBAG - in a multiracial population of n = 1587 women with HLA genotyping data by gold standard methods...
October 24, 2016: International Journal of Immunogenetics
Qiyue Xia, Hongxia Li, Ying Liu, Kai Xiao
Despite the increasing biomedical applications of gold nanoparticles (AuNPs), their toxicological effects need to be thoroughly understood. In the present study, the genotoxic potential of commercially available AuNPs with varying size (5 nm, 20 nm and 50 nm) were assessed using a battery of in vitro and in vivo genotoxicity assays. In the comet assay, 20 nm and 50 nm AuNPs did not induce obvious DNA damage in HepG2 cells at the tested concentrations, whereas 5 nm NPs induced a dose-dependent increment in DNA damage after 24 h exposure...
October 22, 2016: Journal of Biomedical Materials Research. Part A
Pim B Olthof, Michal Heger, Krijn P van Lienden, Kora de Bruin, Roelof J Bennink, Thomas M van Gulik
BACKGROUND: Portal vein embolization is the gold standard approach to preoperatively enhance the future liver remnant before liver resection. Portal vein embolization is studied in several experimental animal models; however, clinical translation of results is often difficult. We aimed to examine the translational value of the portal vein embolization response in a standardized rabbit model by comparing the volume and function increase with the response seen in patients. METHODS: Six rabbits were subjected to embolization of the cranial liver lobes, and the hypertrophy response of the caudal liver lobe was studied using computed tomography volumetry and Technetium-99m-labeled-mebrofenin hepatobiliary scintigraphy...
October 18, 2016: Surgery
Jian-Feng Guo, Dan-Qun Huo, Mei Yang, Chang-Jun Hou, Jun-Jie Li, Huan-Bao Fa, Hui-Bo Luo, Ping Yang
Herein, we have developed a simple, sensitive and paper-based colorimetric sensor for the selective detection of Chromium (Ⅵ) ions (Cr (VI)). Silanization-titanium dioxide modified filter paper (STCP) was used to trap bovine serum albumin capped gold nanoparticles (BSA-Au NPs), leading to the fabrication of BSA-Au NPs decorated membrane (BSA-Au NPs/STCP). The BSA-Au NPs/STCP operated on the principle that BSA-Au NPs anchored on the STCP were gradually etched by Cr (VI) as the leaching process of gold in the presence of hydrobromic acid (HBr) and hence induced a visible color change...
December 1, 2016: Talanta
R Rapini, A Cincinelli, G Marrazza
In this work, we propose an electrochemical DNA aptasensor for sensitive multidetection of acetamiprid based on a competitive format and disposable screen-printed arrays. To improve the sensitivity of the aptasensor, polyaniline film and gold nanoparticles were progressively electrodeposited on the graphite screen-printed electrode surface by cyclic voltammetry. Gold nanoparticles were then employed as platform for thiol-tethered DNA aptamer immobilization. Different acetamiprid solutions containing a fixed amount of biotinylated complementary oligonucleotide sequence by DNA aptasensor arrays were analyzed...
December 1, 2016: Talanta
Yanying Wang, Xiangyang Yu, Xiaoxue Ye, Kangbing Wu, Tsunghsueh Wu, Chunya Li
Gold nanorods (AuNRs) integrated with ZnCdHgSe near-infrared quantum dots (AuNRs-ZnCdHgSe QDs) were successfully synthesized and characterized by transmission electron microscope, X-ray photoelectron spectroscopy, and X-ray diffraction. A glassy carbon electrode was decorated with the aforementioned AuNRs-ZnCdHgSe QDs nanocomposite, which provides a biocompatible interface for the subsequent immobilization of prostate specific antibody (anti-PSA). After being successively treated with glutaraldehyde vapor and bovine serum albumin solution, a photoelectrochemical immunosensing platform based on anti-PSA/AuNRs-ZnCdHgSe QDs/GCE was established...
November 2, 2016: Analytica Chimica Acta
Arián Ráez-Bravo, José Enrique Granados, Emmanuel Serrano, Debora Dellamaria, Rosa Casais, Luca Rossi, Anna Puigdemont, Francisco Javier Cano-Manuel, Paulino Fandos, Jesús María Pérez, José Espinosa, Ramón Casimiro Soriguer, Carlo Citterio, Jorge Ramón López-Olvera
BACKGROUND: Sarcoptic mange is a contagious skin disease caused by the mite Sarcoptes scabiei, affecting different mammalian species worldwide including the Iberian ibex (Capra pyrenaica), in which mortalities over 90 % of the population have been reported. No efficient diagnostic methods are available for this disease, particularly when there are low mite numbers and mild or no clinical signs. In this study, three enzyme-linked immunosorbent assays (ELISA) developed for dog (ELISA A), Cantabrian chamois (Rupicapra pyrenaica parva) (ELISA B) and Alpine chamois (Rupicapra rupicapra) (ELISA C), were evaluated to detect specific antibodies (IgG) to sarcoptic mange in Iberian ibex sera...
October 21, 2016: Parasites & Vectors
Christoph Nowak, Samira Salihovic, Andrea Ganna, Stefan Brandmaier, Taru Tukiainen, Corey D Broeckling, Patrik K Magnusson, Jessica E Prenni, Rui Wang-Sattler, Annette Peters, Konstantin Strauch, Thomas Meitinger, Vilmantas Giedraitis, Johan Ärnlöv, Christian Berne, Christian Gieger, Samuli Ripatti, Lars Lind, Nancy L Pedersen, Johan Sundström, Erik Ingelsson, Tove Fall
Insulin resistance (IR) and impaired insulin secretion contribute to type 2 diabetes and cardiovascular disease. Both are associated with changes in the circulating metabolome, but causal directions have been difficult to disentangle. We combined untargeted plasma metabolomics by liquid chromatography/mass spectrometry in three non-diabetic cohorts with Mendelian Randomization (MR) analysis to obtain new insights into early metabolic alterations in IR and impaired insulin secretion. In up to 910 elderly men we found associations of 52 metabolites with hyperinsulinemic-euglycemic clamp-measured IR and/or β-cell responsiveness (disposition index) during an oral glucose tolerance test...
October 2016: PLoS Genetics
Bret H Clough, Eoin P McNeill, Daniel Palmer, Ulf Krause, Thomas J Bartosh, Christopher D Chaput, Carl A Gregory
BACKGROUND CONTEXT: Spine pain and the disability associated with it are epidemic in the United States. According to the National Center for Health Statistics, >650,000 spinal fusion surgeries are performed annually in the US and yet there is a failure rate of 15-40% when standard methods employing current commercial bone substitutes are utilized. Autologous bone graft is the gold standard in terms of fusion success, but the morbidity associated with the procedure and limitations in the availability of sufficient material has limited its use in the majority of cases...
October 17, 2016: Spine Journal: Official Journal of the North American Spine Society
Constanze Hantel, Igor Shapiro, Giada Poli, Costanza Chiapponi, Martin Bidlingmaier, Martin Reincke, Michaela Luconi, Sara Jung, Felix Beuschlein
In recent years it has been recognized that clinical translation of novel therapeutic strategies for patients with adrenocortical carcinoma (ACC) often fails. These disappointing results indicate that the currently utilized tumor models only poorly reflect relevant pathophysiology and, thereby, do not predict clinical applicability of novel pharmacological approaches. However, also the development of new preclinical ACC models has remained a challenge with only one human cell line (NCI-H295R) and one recently established human pediatric xenograft model (SJ-ACC3) being available for this highly heterogeneous malignancy...
October 15, 2016: Oncotarget
Nicoletta Staropoli, Domenico Ciliberto, Silvia Chiellino, Francesca Caglioti, Teresa Del Giudice, Simona Gualtieri, Angela Salvino, Alessandra Strangio, Cirino Botta, Sandro Pignata, Pierfrancesco Tassone, Pierosandro Tagliaferri
OBJECTIVES: The current gold-standard for the first-line treatment in IIIb/IV stages of epithelial ovarian cancer (EOC) is the combination of carboplatin and paclitaxel plus bevacizumab in some countries. In the era of personalized medicine, there is still uncertainty on the impact of several molecularly targeted agents, which have been investigated for the management of this disease. To shed light on the actual role of targeted therapy in EOC, a systematic review and meta-analysis was performed...
October 13, 2016: Oncotarget
Jibin Song, Peng Huang, Xiaoyuan Chen
Gold nanovesicles contain multiple nanocrystals within a polymeric coating. The strong plasmonic coupling between adjacent nanoparticles in their vesicular shell makes ultrasensitive biosensing and bioimaging possible. In our laboratory, multifunctional plasmonic vesicles are assembled from amphiphilic gold nanocrystals (such as gold nanoparticles and gold nanorods) coated with mixed hydrophilic and hydrophobic polymer brushes or amphiphilic diblock co-polymer brushes. To fulfill the different requirements of biomedical applications, different polymers that are either pH=responsive, photoactive or biodegradable can be used to form the hydrophobic brush, while the hydrophilicity is maintained by polyethylene glycol (PEG)...
November 2016: Nature Protocols
Dingqiang Lu, Fuping Lu, Guangchang Pang
In the current study, a novel double-layer gold nanoparticles-electrochemical immunosensor electrode immobilized with tetrahydrocannabinol (THC) antibody derived from Balb/c mice was developed. To increase the fixed quantity of antibodies and electrochemical signals, an electrochemical biosensing signal amplification system was utilized with gold nanoparticles-thionine-chitosan absorbing horseradish peroxidase (HRP). In addition, a transmission electron microscope (TEM) was used to characterize the nanogold solution...
October 17, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Alyssa B Chinen, Jennifer R Ferrer, Timothy J Merkel, Chad A Mirkin
Two synthetic approaches that allow one to control PEG content within spherical nucleic acids (SNAs) have been developed. One approach begins with RNA-modified gold nanoparticles followed by a backfill of PEG 2K alkanethiols, and the other involves co-adsorption of the two entities on a gold nanoparticle template. These two methods have been used to explore the role of PEG density on the chemical and biological properties of RNA-SNAs. Such studies show that while increasing the extent of PEGylation within RNA-SNAs extends their blood circulation half-life in mice, it also results in decreased cellular uptake...
October 20, 2016: Bioconjugate Chemistry
Ahmad Alodaib, Nara Sobreira, Wendy A Gold, Lisa G Riley, Nicole J Van Bergen, Meredith J Wilson, Bruce Bennetts, David R Thorburn, Corinne Boehm, John Christodoulou
Recent advances in next-generation sequencing strategies have led to the discovery of many novel disease genes. We describe here a non-consanguineous family with two affected boys presenting with early onset of severe axonal neuropathy, optic atrophy, intellectual disability, auditory neuropathy and chronic respiratory and gut disturbances. Whole-exome sequencing (WES) was performed on all family members and we identified compound heterozygous variants (c.[760C>A];[1528G>C];p.[(Gln254Lys);(Ala510Pro)] in the polyribonucleotide nucleotidyltransferase 1 (PNPT1) gene in both affected individuals...
October 19, 2016: European Journal of Human Genetics: EJHG
J M Greene, P Dash, S Roy, C McMurtrey, W Awad, J S Reed, K B Hammond, S Abdulhaqq, H L Wu, B J Burwitz, B F Roth, D W Morrow, J C Ford, G Xu, J Y Bae, H Crank, A W Legasse, T H Dang, H Y Greenaway, M Kurniawan, M C Gold, M J Harriff, D A Lewinsohn, B S Park, M K Axthelm, J J Stanton, S G Hansen, L J Picker, V Venturi, W Hildebrand, P G Thomas, D M Lewinsohn, E J Adams, J B Sacha
Studies on mucosal-associated invariant T cells (MAITs) in nonhuman primates (NHP), a physiologically relevant model of human immunity, are handicapped due to a lack of macaque MAIT-specific reagents. Here we show that while MR1 ligand-contact residues are conserved between human and multiple NHP species, three T-cell receptor contact-residue mutations in NHP MR1 diminish binding of human MR1 tetramers to macaque MAITs. Construction of naturally loaded macaque MR1 tetramers facilitated identification and characterization of macaque MR1-binding ligands and MAITs, both of which mirrored their human counterparts...
October 19, 2016: Mucosal Immunology
Carla M Zammit, Florian Weiland, Joël Brugger, Benjamin Wade, Lyron Juan Winderbaum, Dietrich H Nies, Gordon Southam, Peter Hoffmann, Frank Reith
The metal-resistant β-proteobacterium Cupriavidus metallidurans drives gold (Au) biomineralisation and the (trans)formation of Au nuggets largely via unknown biochemical processes, ultimately leading to the reductive precipitation of mobile, toxic Au(i/iii)-complexes. In this study proteomic responses of C. metallidurans CH34 to mobile, toxic Au(iii)-chloride are investigated. Cells were grown in the presence of 10 and 50 μM Au(iii)-chloride, 50 μM Cu(ii)-chloride and without additional metals. Differentially expressed proteins were detected by difference gel electrophoresis and identified by liquid chromatography coupled mass spectrometry...
October 19, 2016: Metallomics: Integrated Biometal Science
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