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https://www.readbyqxmd.com/read/28809821/gradient-strain-chip-for-stimulating-cellular-behaviors-in-cell-laden-hydrogel
#1
Hsin-Yi Hsieh, Chiao-Wen Chu, Ming-Hsuan Chiu, Shueh-Yao Chu, Tsu-Wei Huang, Fan-Gang Tseng
Artificial guidance for cellular alignment is a hot topic in the field of tissue engineering. Most of the previous research has investigated single strain-induced cellular alignment on a cell-laden hydrogel by using complex experimental processes and mass controlling systems, which are usually associated with contamination issues. Thus, in this article, we propose a simple approach to building a gradient static strain using a fluidic chip with a plastic PDMS cover and a UV transparent glass substrate for the stimulation of cellular behavior in a 3D hydrogel...
August 8, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28807548/application-of-a-simple-column-switching-ion-chromatography-technique-for-removal-of-matrix-interferences-and-sensitive-fluorescence-determination-of-acidic-compounds-pharmaceutical-drugs-in-complex-samples
#2
Nadeem Muhammad, Qamar Subhani, Fenglian Wang, Dandan Guo, Qiming Zhao, Shuchao Wu, Yan Zhu
This work illustrates the introduction of a simple, rugged and flexible column-switching ion chromatography (IC) technique for an automated on-line QuEChERS extracted samples extracts washing followed by sensitive fluorescence (FLD) determination of five acidic pharmaceutical drugs namely; clofibric acid (CLO), ibuprofen (IBU), aspirin (ASP), naproxen (NAP) and flurobrofen (FLU) in three complex samples (spinach, apple and hospital sewage sludge). An old anion exchange column IonPac(®) AS11-HC was utilized as a pre-treatment column for on-line washing of inorganic and organic interferences followed by isocratic separation of five acidic drugs with another anion exchange IonPac(®) AS12A analytical column by exploiting the column-switching technique...
July 5, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28806071/contrasting-effects-of-dissolved-organic-matter-on-mercury-methylation-by-g-sulfurreducens-pca-and-d-desulfuricans-nd132
#3
Linduo Zhao, Hongmei Chen, Xia Lu, Hui Lin, Geoff A Christensen, Eric M Pierce, Baohua Gu
Natural dissolved organic matter (DOM) affects mercury (Hg) redox reactions and anaerobic microbial Hg methylation in the environment. Several studies have shown that DOM can enhance Hg methylation, especially under sulfidic conditions, whereas others show that DOM inhibits Hg methylation due to strong Hg-DOM complexation. In this study, we investigated and compared the effects of DOM on Hg methylation by an iron-reducing bacterium Geobacter sulfurreducens PCA and a sulfate-reducing bacterium Desulfovibrio desulfuricans ND132 under non-sulfidic conditions...
August 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28803116/efficient-molecularly-imprinted-polymer-as-a-pipette-tip-solid-phase-sorbent-for-determination-of-carvedilol-enantiomers-in-human-urine
#4
Anny Talita Maria da Silva, Hanna Leijoto de Oliveira, Camilla Fonseca Silva, Matheus Cecílio Fonseca, Thales Fernando Dias Pereira, Clebio Soares Nascimento, Eduardo Costa de Figueiredo, Keyller Bastos Borges
In this work, an efficient pipette tip based on molecularly imprinted polymers solid-phase extraction (PT-MIP-SPE) method was developed for carvedilol (CAR) analysis. This compound is available in clinical practice as a racemic mixture, in which (-)-(S)-CAR is a β- and α1-adrenergic antagonist, while (+)-(R)-CAR only acts as an α1-adrenergic antagonist. Enantioseparation of CAR presented satisfactory retention times (5.85 and 14.84min), acceptable theoretical plates (N=2048 and 2018) and good resolution (Rs=9...
August 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28796492/structural-and-morphological-description-of-sn-snox-core-shell-nanoparticles-synthesized-and-isolated-from-ionic-liquid
#5
Nadia Soulmi, Damien Dambournet, Cécile Rizzi, Juliette Sirieix-Plénet, Mathieu Duttine, Alain Wattiaux, Jolanta Swiatowska, Olaf J Borkiewicz, Henri Groult, Laurent Gaillon
The potential application of high capacity Sn-based electrode materials for energy storage, particularly in rechargeable batteries, has led to extensive research activities. In this scope, the development of an innovative synthesis route allowing to downsize particles to the nanoscale is of particular interest owing to the ability of such nanomaterial to better accommodate volume changes upon electrochemical reactions. Here, we report on the use of room temperature ionic liquid (i.e., [EMIm(+)][TFSI(-)]) as solvent, template, and stabilizer for Sn-based nanoparticles...
August 10, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28791014/rapid-automated-and-specific-immunoassay-to-directly-measure-matrix-metalloproteinase-9-tissue-inhibitor-of-metalloproteinase-1-interactions-in-human-plasma-using-alphalisa-technology-a-new-alternative-to-classical-elisa
#6
Helena Pulido-Olmo, Elena Rodríguez-Sánchez, José Alberto Navarro-García, María G Barderas, Gloria Álvarez-Llamas, Julián Segura, Marisol Fernández-Alfonso, Luis M Ruilope, Gema Ruiz-Hurtado
The protocol describes a novel, rapid, and no-wash one-step immunoassay for highly sensitive and direct detection of the complexes between matrix metalloproteinases (MMPs) and their tissue inhibitor of metalloproteinases (TIMPs) based on AlphaLISA(®) technology. We describe two procedures: (i) one approach is used to analyze MMP-9-TIMP-1 interactions using recombinant human MMP-9 with its corresponding recombinant human TIMP-1 inhibitor and (ii) the second approach is used to analyze native or endogenous MMP-9-TIMP-1 protein interactions in samples of human plasma...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28782924/high-signal-to-background-ratio-detection-of-cancer-cells-with-activatable-strategy-based-on-target-induced-self-assembly-of-split-aptamers
#7
Baoyin Yuan, Yuqiong Sun, Qiuping Guo, Jin Huang, Xiaohai Yang, Yuanyuan Chen, Xiaohong Wen, Xiangxian Meng, Jianbo Liu, Kemin Wang
Highly sensitive detection of cancer cells with high signal-to-background ratio (SBR) is still urgently needed. Here, a self-assembling activatable probe (SAAP) based on split aptamers was developed to meet this purpose. The SAAP is formed with quenched fluorescence; only when target cells are present would the split aptamers self-assemble together and thus activate fluorescence by intramolecular and intermolecular fluorescence quenching strategies. As proof of concept, a split aptamer pair stemming from an intact aptamer, ZY11, developed by our lab was selected to construct SAAP...
August 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28781731/neuropsychological-functioning-in-obsessive-compulsive-washers-drug-naive-without-depressive-symptoms
#8
Ali Akbar Saremi, Seyed Vahid Shariat, Mohammad Ali Nazari, Behrooz Dolatshahi
INTRODUCTION: Obsessive-Compulsive Disorder (OCD) is a complex and heterogeneous neuropsychiatric syndrome. Contamination obsessions and washing/cleaning compulsions are the most frequent clinical OCD subtypes. The current study aimed at examining the neuropsychological impairments in drug-naive obsessive-compulsive (OC) washers without depressive symptoms and their association with the severity of symptoms. METHODS: In the current causal-comparative study, 35 patients with diagnostic and statistical mental disorders class (DSM)-IV diagnosed with washing-subtype OCD and 35 healthy subjects were selected by the convenience sampling method and evaluated by computerized neuropsychology battery and clinical tests as Stroop Color-Word Test (SCWT), Wisconsin Card Sorting Test (WCST), Go/No-Go Test, Digits Forward (DF), Digits Backward (DB), Yale-Brown Obsessive-Compulsive Scale (Y-BOCS), Beck Depression Inventory (BDI), Beck Anxiety Inventory (BAI), and General Health Questionnaire (GHQ)-28...
May 2017: Basic and Clinical Neuroscience
https://www.readbyqxmd.com/read/28743656/development-of-a-rapid-immunoassay-system-luminescent-detection-of-antigen-associated-antibody-luciferase-in-the-presence-of-a-dye-that-absorbs-light%C3%A2-from-free-antibody-luciferase
#9
Akihiro Mori, Teruyo Ojima-Kato, Shingo Fuchi, Shinichi Kaiya, Takaaki Kojima, Hideo Nakano
In this report, we developed a rapid immunoassay system, designated the bioluminescent interference gathering optical (BINGO) assay, which required no time-consuming washing steps for removal of unbound antibodies. This system employed a luciferase (Luc)-conjugated antibody (LucAb) and a dye that absorbed light from the LucAb. The antigen-associated LucAb was localized by transfer of an antigen to the detector-side of a chamber where a detector photomultiplier tube (PMT) was installed. In contrast, the free LucAb was distributed throughout the solution, and the light emitted by the free LucAb was absorbed by the dye...
July 22, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28742329/selecting-a-dna-encoded-chemical-library-against-non-immobilized-proteins-using-a-ligate-cross-link-purify-strategy
#10
Bingbing Shi, Yuqing Deng, Peng Zhao, Xiaoyu Li
DNA-encoded chemical libraries (DELs) have recently emerged and become an important technology platform in biomedical research and drug discovery. DELs containing large numbers of compounds can be prepared and selected against biological targets to discover novel ligands and inhibitors. In practice, DELs are usually selected against purified and immobilized proteins using the typical "bind-wash-elute" protocol; however, selection methods compatible with non-immobilized proteins would be able to greatly expand the target scope of DELs beyond purified proteins to more-complex and biologically relevant targets...
August 10, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28738229/a-facile-one-step-method-for-cell-lysis-and-dna-extraction-of-waterborne-pathogens-using-a-microchip
#11
Vivek Kamat, Sulaxna Pandey, Kishore Paknikar, Dhananjay Bodas
Globally, waterborne organisms are the primary causative agents for the transmission of various forms of diarrheal diseases. For accurate diagnosis, molecular tools have gained considerable attention in the recent past. Molecular tools require DNA as the starting material for diagnosis, and hence, a prerequisite is the quality and integrity of DNA. To obtain high quality DNA rapidly, we have fabricated a microchip in poly(dimethyl siloxane) (PDMS) by soft lithography process. The microchip facilitated in-flow coating of chitosan on the magnetic nanoparticles, which under external mechanical vibration caused cell lysis and released DNA in the supernatant...
July 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28737374/integrated-sers-based-microdroplet-platform-for-the-automated-immunoassay-of-f1-antigens-in-yersinia-pestis
#12
Namhyun Choi, Jiyoung Lee, Juhui Ko, Jun Ho Jeon, Gi-Eun Rhie, Andrew J deMello, Jaebum Choo
The development of surface-enhanced Raman scattering (SERS)-based microfluidic platforms has attracted significant recent attention in the biological sciences. SERS is a highly sensitive detection modality, with microfluidic platforms providing many advantages over microscale methods, including high analytical throughput, facile automation, and reduced sample requirements. Accordingly, the integration of SERS with microfluidic platforms offers significant utility in chemical and biological experimentation. Herein, we report a fully integrated SERS-based microdroplet platform for the automatic immunoassay of specific antigen fraction 1 (F1) in Yersinia pestis...
August 3, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28704876/mesenteric-masses-on-2d-mode-and-contrast-enhanced-ultrasound-a-retrospective-study-in-69-patients
#13
Corinna Trenker, Ehsan Safaei Zadeh, Golo Petzold, Christian Görg, Albrecht Neesse
Purpose Detection of mesenteric masses (MM) by 2 D ultrasound often causes a diagnostic dilemma, and histological confirmation is required for definite diagnosis. The value of contrast-enhanced ultrasound (CEUS) for the diagnosis of MMs has not been investigated before. Here, we retrospectively evaluate 2D-mode and CEUS patterns of 69 patients with histologically confirmed MMs. Materials and Methods Between January 2006 and January 2016, n = 69 patients were included in the study. Histopathological data, clinical data, 2D-mode ultrasound and CEUS enhancement were retrospectively analyzed...
July 13, 2017: Ultraschall in der Medizin
https://www.readbyqxmd.com/read/28697458/uptake-and-toxicity-of-cuo-nanoparticles-to-daphnia-magna-varies-between-indirect-dietary-and-direct-waterborne-exposures
#14
Fan Wu, Amy Bortvedt, Bryan J Harper, Lauren E Crandon, Stacey L Harper
Research examining the direct and indirect ecological effects of nanomaterials in aquatic ecosystems is important for developing a more realistic understanding of the environmental implications of nanotechnology. Copper oxide nanoparticles (CuO NPs) are being used extensively in many industries but are considered highly toxic to aquatic species residing in surface waters. Few studies have addressed whether CuO NPs can be transferred through the aquatic food chain, and if such indirect exposure to nanomaterials impacts their toxicity...
September 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28685328/generation-of-domestic-waste-electrical-and-electronic-equipment-on-fernando-de-noronha-island-qualitative-and-quantitative-aspects
#15
Dhiego Raphael Rodrigues Araujo, José Diego de Oliveira, Vanice Fragoso Selva, Maisa Mendonça Silva, Simone Machado Santos
The accelerated growth trajectory of waste electrical and electronic equipment (WEEE) is a matter of concern for governments worldwide. In developing countries, the problem is more complex because municipal waste management is still a challenge for municipalities. Fernando de Noronha Island, an environmentally protected area, has a transfer station for solid waste before it is sent to the final destination abroad, which is different waste management model to most urban areas. In order to check the specifics of management of WEEE, this study aimed to qualitatively and quantitatively evaluate the generation of this type of waste on the main island of Fernando de Noronha, taking into consideration aspects related to consumption habits and handling of waste...
July 6, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28679706/indirect-competitive-enzyme-linked-immunosorbent-assay-elisa
#16
Thomas O Kohl, Carl A Ascoli
The indirect competitive ELISA (indirect cELISA) pits plate-immobilized antigen against antigens in solution for binding to antigen-specific antibody. The antigens in solution are in the test sample and are first incubated with antigen-specific antibody. These antibody-antigen complexes are then added to microtiter plates whose wells have been coated with purified antigen. The wells are washed to remove unbound antigen-antibody complexes and free antigen. A reporter-labeled secondary antibody is then added followed by the addition of substrate...
July 5, 2017: Cold Spring Harbor Protocols
https://www.readbyqxmd.com/read/28679705/direct-competitive-enzyme-linked-immunosorbent-assay-elisa
#17
Thomas O Kohl, Carl A Ascoli
The competitive enzyme-linked immunosorbent assay (ELISA) (cELISA; also called an inhibition ELISA) is designed so that purified antigen competes with antigen in the test sample for binding to an antibody that has been immobilized in microtiter plate wells. The same concept works if the immobilized molecule is antigen and the competing molecules are purified labeled antibody versus antibody in a test sample. Direct cELISAs incorporate labeled antigen or antibody, whereas indirect assay configurations use reporter-labeled secondary antibodies...
July 5, 2017: Cold Spring Harbor Protocols
https://www.readbyqxmd.com/read/28672835/magnetic-solid-phase-extraction-with-fe%C3%A2-o%C3%A2-molecularly-imprinted-polymers-modified-by-deep-eutectic-solvents-and-ionic-liquids-for-the-rapid-purification-of-alkaloid-isomers-theobromine-and-theophylline-from-green-tea
#18
Guizhen Li, Xiaoqin Wang, Kyung Ho Row
Different kinds of deep eutectic solvents (DES) based on choline chloride (ChCl) and ionic liquids (ILs) based on 1-methylimidazole were used to modify Fe3O4/molecularly imprinted polymers (Fe3O4/MIPs), and the resulting materials were applied for the rapid purification of alkaloid isomers (theobromine and theophylline) from green tea with magnetic solid-phase extraction (M-SPE). The M-SPE procedure was optimized using the response surface methodology (RSM) to analyze the maximum conditions. The materials were characterized by Fourier transform infrared spectroscopy (FI-IR) and field emission scanning electron microscopy (FE-SEM)...
June 25, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28668496/generation-of-nanobodies-against-slyd-and-development-of-tools-to-eliminate-this-bacterial-contaminant-from-recombinant-proteins
#19
Yaozhong Hu, Ema Romão, Didier Vertommen, Cécile Vincke, Francisco Morales-Yánez, Carlos Gutiérrez, Changxiao Liu, Serge Muyldermans
The gene for a protein domain, derived from a tumor marker, fused to His tag codons and under control of a T7 promotor was expressed in E. coli strain BL21 (DE3). The recombinant protein was purified from cell lysates through immobilized metal affinity chromatography and size-exclusion chromatography. A contaminating bacterial protein was consistently co-purified, even using stringent washing solutions containing 50 or 100 mM imidazole. Immunization of a dromedary with this contaminated protein preparation, and the subsequent generation and panning of the immune Nanobody library yielded several Nanobodies of which 2/3 were directed against the bacterial contaminant, reflecting the immunodominance of this protein to steer the dromedary immune response...
September 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/28665233/decellularization-of-whole-human-liver-grafts-using-controlled-perfusion-for-transplantable-organ-bioscaffolds
#20
Monique M A Verstegen, Jorke Willemse, Sjoerd van den Hoek, Gert-Jan Kremers, Theo M Luider, Nick A van Huizen, Francois E J A Willemssen, Herold J Metselaar, Jan N M IJzermans, Luc J W van der Laan, Jeroen de Jonge
Liver transplantation is the only effective treatment for end-stage liver disease, but absolute donor shortage remains a limiting factor. Recent advances in tissue engineering focus on generation of native extracellular matrix (ECM) by decellularized complete livers in animal models. Although proof of concept has been reported for human livers, this study aims to perform whole liver decellularization in a clinically relevant series using controlled machine perfusion. In this study, we describe a mild nondestructive decellularization protocol, effective in 11 discarded human whole liver grafts to generate constructs that reliably maintain hepatic architecture and ECM components using machine perfusion, while completely removing cellular DNA and RNA...
July 31, 2017: Stem Cells and Development
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