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https://www.readbyqxmd.com/read/28350460/time-dependent-model-for-fluid-flow-in-porous-materials-with-multiple-pore-sizes
#1
Brian M Cummins, Rukesh Chinthapatla, Frances S Ligler, Glenn M Walker
An understanding of fluid transport through porous materials is critical for the development of lateral flow assays and analytical devices based on paper microfluidics. Models of fluid transport within porous materials often assume a single capillary pressure and permeability value for the material, implying that the material comprises a single pore size and that the porous material is fully saturated behind the visible wetted front. As a result, current models can lead to inaccuracies when modeling transport over long distances and/or times...
March 28, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28346363/rapid-and-low-cost-crp-measurement-by-integrating-a-paper-based-microfluidic-immunoassay-with-smartphone-crp-chip
#2
Meili Dong, Jiandong Wu, Zimin Ma, Hagit Peretz-Soroka, Michael Zhang, Paul Komenda, Navdeep Tangri, Yong Liu, Claudio Rigatto, Francis Lin
Traditional diagnostic tests for chronic diseases are expensive and require a specialized laboratory, therefore limiting their use for point-of-care (PoC) testing. To address this gap, we developed a method for rapid and low-cost C-reactive protein (CRP) detection from blood by integrating a paper-based microfluidic immunoassay with a smartphone (CRP-Chip). We chose CRP for this initial development because it is a strong biomarker of prognosis in chronic heart and kidney disease. The microfluidic immunoassay is realized by lateral flow and gold nanoparticle-based colorimetric detection of the target protein...
March 26, 2017: Sensors
https://www.readbyqxmd.com/read/28346335/apparent-interfacial-tension-effects-in-protein-stabilized-emulsions-prepared-with-microstructured-systems
#3
Carme Güell, Montserrat Ferrando, Alexandre Trentin, Karin Schroën
Proteins are mostly used to stabilize food emulsions; however, production of protein containing emulsions is notoriously difficult to capture in scaling relations due to the complex behavior of proteins in interfaces, in combination with the dynamic nature of the emulsification process. Here, we investigate premix membrane emulsification and use the Ohnesorge number to derive a scaling relation for emulsions prepared with whey protein, bovine serum albumin (BSA), and a standard emulsifier Tween 20, at various concentrations (0...
March 25, 2017: Membranes
https://www.readbyqxmd.com/read/28346053/rapid-prototyping-of-a-cyclic-olefin-copolymer-microfluidic-device-for-automated-oocyte-culturing
#4
Miguel Berenguel-Alonso, Maria Sabés-Alsina, Roser Morató, Oriol Ymbern, Laura Rodríguez-Vázquez, Oriol Talló-Parra, Julián Alonso-Chamarro, Mar Puyol, Manel López-Béjar
Assisted reproductive technology (ART) can benefit from the features of microfluidic technologies, such as the automation of time-consuming labor-intensive procedures, the possibility to mimic in vivo environments, and the miniaturization of the required equipment. To date, most of the proposed approaches are based on polydimethylsiloxane (PDMS) as platform substrate material due to its widespread use in academia, despite certain disadvantages, such as the elevated cost of mass production. Herein, we present a rapid fabrication process for a cyclic olefin copolymer (COC) monolithic microfluidic device combining hot embossing-using a low-temperature cofired ceramic (LTCC) master-and micromilling...
January 1, 2017: SLAS Technol
https://www.readbyqxmd.com/read/28345345/continuously-electrotriggered-core-coalescence-of-double-emulsion-drops-for-microreactions
#5
Likai Hou, Yukun Ren, Yankai Jia, Xiaokang Deng, Weiyu Liu, Xiangsong Feng, Hongyuan Jiang
Microfluidically-generated double emulsions are promising templates for microreactions, which protect the reaction from external disturbance and enable in vitro analyses with large-scale samples. Controlled combination of their inner droplets in a continuous manner is an essential requirement toward truly applications. Here, we first generate dual-cored double-emulsion drops with different inner encapsulants using a capillary microfluidic device; then, we transfer the emulsion drops into another electrode integrated PDMS microfluidic device and utilize external AC electric field to continuously trigger the coalescence of inner cores inside these emulsion drops in continuous flow...
March 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28345089/dancing-disclinations-in-confined-active-nematics
#6
Tyler N Shendruk, Amin Doostmohammadi, Kristian Thijssen, Julia M Yeomans
The spontaneous emergence of collective flows is a generic property of active fluids and often leads to chaotic flow patterns characterised by swirls, jets, and topological disclinations in their orientation field. However, the ability to achieve structured flows and ordered disclinations is of particular importance in the design and control of active systems. By confining an active nematic fluid within a channel, we find a regular motion of disclinations, in conjunction with a well defined and dynamic vortex lattice...
March 27, 2017: Soft Matter
https://www.readbyqxmd.com/read/28345085/formation-of-surface-nanodroplets-facing-a-structured-microchannel-wall
#7
Haitao Yu, Shantanu Maheshwari, Jiuyang Zhu, Detlef Lohse, Xuehua Zhang
Surface nanodroplets are important units for lab-on-a-chip devices, compartmentalised catalytic reactions, high-resolution near-field imaging, and many others. Solvent exchange is a simple solution-based bottom-up approach for producing surface nanodroplets by displacing a good solvent of the droplet liquid by a poor one in a narrow channel in the laminar regime. The droplet size is controlled by the solution composition and the flow conditions during the solvent exchange. In this paper, we investigated the effects of local microfluidic structures on the formation of surface nanodroplets...
March 27, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28345028/self-powered-integrated-microfluidic-point-of-care-low-cost-enabling-simple-chip
#8
Erh-Chia Yeh, Chi-Cheng Fu, Lucy Hu, Rohan Thakur, Jeffrey Feng, Luke P Lee
Portable, low-cost, and quantitative nucleic acid detection is desirable for point-of-care diagnostics; however, current polymerase chain reaction testing often requires time-consuming multiple steps and costly equipment. We report an integrated microfluidic diagnostic device capable of on-site quantitative nucleic acid detection directly from the blood without separate sample preparation steps. First, we prepatterned the amplification initiator [magnesium acetate (MgOAc)] on the chip to enable digital nucleic acid amplification...
March 2017: Science Advances
https://www.readbyqxmd.com/read/28344727/characterization-of-vascular-permeability-using-a-biomimetic-microfluidic-blood-vessel-model
#9
Antony Thomas, Shunqiang Wang, Salman Sohrabi, Colin Orr, Ran He, Wentao Shi, Yaling Liu
The inflammatory response in endothelial cells (ECs) leads to an increase in vascular permeability through the formation of gaps. However, the dynamic nature of vascular permeability and external factors involved is still elusive. In this work, we use a biomimetic blood vessel (BBV) microfluidic model to measure in real-time the change in permeability of the EC layer under culture in physiologically relevant flow conditions. This platform studies the dynamics and characterizes vascular permeability when the EC layer is triggered with an inflammatory agent using tracer molecules of three different sizes, and the results are compared to a transwell insert study...
March 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28344726/evaluation-of-disposable-microfluidic-chip-design-for-automated-and-fast-immunoassays
#10
Guochun Wang, Champak Das, Bradley Ledden, Qian Sun, Chien Nguyen, Sai Kumar
We report here, the design and development of a disposable immunoassay chip for protein biomarker detection within ∼1 h. The unique design allows for real-time dynamic calibration of immunoassay for multiple biomarker detections on the chip. The limit of detection achieved for this test chip is 10 pg/ml for IL6, and 50 pg/ml for GFAP with a detection time of 1 h. The prototype instrument used for flowing the reagents through the chip can be easily assembled from off-the-shelf components with the final chemiluminescent detection carried out in a commercial plate reader...
January 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28344725/sensitive-and-predictable-separation-of-microfluidic-droplets-by-size-using-in-line-passive-filter
#11
Ruihua Ding, W Lloyd Ung, John A Heyman, David A Weitz
Active manipulation of droplets is crucial in droplet microfluidics. However, droplet polydispersity decreases the accuracy of active manipulation. We develop a microfluidic "droplet filter" that accurately separates droplets by size. The droplet filter has a sharp size cutoff and is capable of distinguishing droplets differing in volume by 20%. A simple model explains the behavior of the droplets as they pass through the filter. We show application of the filter in improving dielectric sorting efficiency.
January 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28343437/organs-on-chips-progress-challenges-and-future-directions
#12
Lucie A Low, Danilo A Tagle
The National Institutes of Health Microphysiological Systems (MPS) program, led by the National Center for Advancing Translational Sciences, is part of a joint effort on MPS development with the Defense Advanced Research Projects Agency and with regulatory guidance from FDA, is now in its final year of funding. The program has produced many tangible outcomes in tissue chip development in terms of stem cell differentiation, microfluidic engineering, platform development, and single and multi-organ systems-and continues to help facilitate the acceptance and use of tissue chips by the wider community...
January 1, 2017: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28343136/facile-microfluidic-production-of-composite-polymer-core-shell-microcapsules-and-crescent-shaped-microparticles
#13
Ekanem E Ekanem, Zilin Zhang, Goran T Vladisavljević
HYPOTHESIS: Core-shell microcapsules and crescent-shaped microparticles can be used as picolitre bioreactors for cell culture and microwells for cell trapping/immobilisation, respectively. RESULTS: Monodisperse polylactic acid (PLA) core-shell microcapsules with a diameter above 200μm, a shell thickness of 10μm, and 96% water entrapment efficiency were produced by solvent evaporation from microfluidically generated W/O/W emulsion drops with core-shell structure, and used to encapsulate Saccharomyces cerevisiae yeast cells in their aqueous cores...
March 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28342718/noisy-response-to-antibiotic-stress-predicts-subsequent-single-cell-survival-in-an-acidic-environment
#14
Karin Mitosch, Georg Rieckh, Tobias Bollenbach
Antibiotics elicit drastic changes in microbial gene expression, including the induction of stress response genes. While certain stress responses are known to "cross-protect" bacteria from other stressors, it is unclear whether cellular responses to antibiotics have a similar protective role. By measuring the genome-wide transcriptional response dynamics of Escherichia coli to four antibiotics, we found that trimethoprim induces a rapid acid stress response that protects bacteria from subsequent exposure to acid...
March 21, 2017: Cell Systems
https://www.readbyqxmd.com/read/28342296/control-of-osmotic-pressure-to-improve-cell-viability-in-cell-laden-tissue-engineering-constructs
#15
A F Carvalho, L Gasperini, R S Ribeiro, A P Marques, R L Reis
Design of tissue engineering strategies deals with the need to balance both biomaterials characteristics and techniques specificities, often resulting in cell-compromising processing conditions. One important factor often disregarded is the osmotic pressure to which cells are exposed to. An in-house microfluidic system was used to prove that addition of an osmotic regulator significantly benefits the generation of viable cell-laden hydrogels under harsh processing conditions. Human adipose-derived stem cells (hASCs) were resuspended in 1...
March 25, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28342274/a-feasibility-study-for-enrichment-of-highly-aggressive-cancer-subpopulations-by-their-biophysical-properties-via-dielectrophoresis-enhanced-with-synergistic-fluid-flow
#16
Temple Anne Douglas, Jaka Cemazar, Nikita Balani, Daniel C Sweeney, Eva M Schmelz, Rafael V Davalos
A common problem with cancer treatment is the development of treatment resistance and tumor recurrence that result from treatments that kill most tumor cells yet leave behind aggressive cells to repopulate. Presented here is a microfluidic device that can be used to isolate tumor subpopulations to optimize treatment selection. Dielectrophoresis (DEP) is a phenomenon where particles are polarized by an electric field and move along the electric field gradient. Different cell subpopulations have different DEP responses depending on their bioelectrical phenotype, which, we hypothesize, correlate with aggressiveness...
March 25, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28341988/unexpected-differences-between-planar-and-column-liquid-chromatographic-retention-of-1-acenaphthenol-enantiomers-controlled-by-supramolecular-interactions-involving-%C3%AE-cyclodextrin-at-subambient-temperatures
#17
Hatsuichi Ohta, Elżbieta Włodarczyk, Krzysztof Piaskowski, Aleksandra Kaleniecka, Lucyna Lewandowska, Michał J Baran, Mariusz Wojnicz, Kiyokatsu Jinno, Yoshihiro Saito, Paweł K Zarzycki
We report the results of experimental work focusing on host-guest supramolecular complex creation between macrocyclic compound (β-cyclodextrin) and 1-acenaphthenol enantiomers (racemic mixture) in liquid phase composed of 35% acetonitrile in water (v/v) at different temperatures ranging from 0 to 90 °C. Experimental setup involved several analytical protocols based on classical non-forced flow planar chromatography (RP-18 TLC plates), micro-TLC (RP-18 W HPTLC plates), column chromatography (HPLC with C-18 and C-30 stationary phases), as well as UV-Vis spectrophotometry and optical microscopy...
March 24, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28341484/ruvbl1-itfg1-interaction-is-required-for-collective-invasion-in-breast-cancer
#18
Wenjun Fan, Jiajun Xie, Jianglong Xia, Yan Zhang, Mengying Yang, Hefei Wang, Yujia Pan, Mengjuan Zhang, Baochun Han, Baitong Wu, Zhijie Hou, Dapeng Liang, Chunli Wang, Jie Xu, Lijuan Song, Quentin Liu
BACKGROUND: The mechanisms of breast cancer collective invasion are poorly understood limiting the metastasis therapy. The ATPase RUVBL1 is frequently overexpressed in various cancers and plays a crucial role in oncogenic process. We further investigated the role of RUVBL1 in promoting collective invasion and uncovered that targeting RUVBL1 could inhibit metastatic progression. METHODS: The expression levels of RUVBL1 and ITFG1 were examined by Western blot and qRT-PCR...
March 21, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28340791/solid-phase-extraction-microfluidic-devices-for-matrix-removal-in-trace-element-assay-of-actinide-materials
#19
Jun Gao, Benjamin T Manard, Alonso Castro, Dennis P Montoya, Ning Xu, Rebecca M Chamberlin
Advances in sample nebulization and injection technology have significantly reduced the volume of solution required for trace impurity analysis in plutonium and uranium materials. Correspondingly, we have designed and tested a novel chip-based microfluidic platform, containing a 100-µL or 20-µL solid-phase microextraction column, packed by centrifugation, which supports nuclear material mass and solution volume reductions of 90% or more compared to standard methods. Quantitative recovery of 28 trace elements in uranium was demonstrated using a UTEVA chromatographic resin column, and trace element recovery from thorium (a surrogate for plutonium) was similarly demonstrated using anion exchange resin AG MP-1...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340771/a-dnazyme-sensor-based-on-target-catalyzed-hairpin-assembly-for-enzyme-free-and-non-label-single-nucleotide-polymorphism-genotyping
#20
Huiyan Xu, Qiwang Wu, Hong Shen
Single nucleotide polymorphisms (SNPs) are widely existed in human genome and associated with many diseases. Traditional PCR-based methods for SNP genotyping require protein enzyme, precise control of temperature and removal of resultant products, making the whole process labor intensive and time consuming. Although G-quadruplex DNAzyme-based assays provide many advantages over traditional approaches, the relatively low catalytic activity of DNAzyme becomes an unfavorable factor in its application process. Therefore, amplification of DNAzyme for further determination is of great desire in bioanalysis...
May 15, 2017: Talanta
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