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Biomedical Microdevices

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https://www.readbyqxmd.com/read/28229307/investigation-of-osteogenic-activity-of-primary-rabbit-periosteal-cells-stimulated-by-multi-axial-tensile-strain
#1
Chih-Hao Chiu, Jun-Liang Liu, Chih-Hsuan Chang, Kin Fong Lei, Alvin Chao-Yu Chen
Periosteum-derived cells was indicated to respond to mechanical force and have stem cell potential capable of differentiating into multiple tissue. Investigation of osteogenic activity under mechanical stimulation is important to understand the therapeutic conditions of fracture healing. In this work, a cell culture platform was developed for respectively providing isotropic and anisotropic axial strain. Primary rabbit periosteal cells were isolated and cultured in the chamber. Multi-axial tensile strain was received and osteogenic activity was investigated by mRNA expressions of CBFA1 and OPN...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28194610/a-new-phosphothreonine-lyase-electrochemical-immunosensor-for-detecting-salmonella-based-on-horseradish-peroxidase-gnps-thionine-chitosan
#2
Dingqiang Lu, Guangchang Pang, Junbo Xie
In the current study, a novel double-layer gold nanoparticles- electrochemical immunosensor electrode (DGN-EIE) immobilized with Salmonella plasmid virulence C (SpvC) antibody was developed. To increase the fixed quantity of antibodies and electrochemical signal, an electrochemical biosensing signal amplification system was utilized with gold nanoparticles-thionine-chitosan absorbing horseradish peroxidase (HRP). In addition, the SpvC monoclonal antibodies (derived from Balb/c mice) were prepared and screened with a high affinity to SpvC...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28144839/yeasts-identification-in-microfluidic-devices-using-peptide-nucleic-acid-fluorescence-in-situ-hybridization-pna-fish
#3
André M Ferreira, Daniela Cruz-Moreira, Laura Cerqueira, João M Miranda, Nuno F Azevedo
Peptide nucleic acid fluorescence in situ hybridization (PNA-FISH) is a highly specific molecular method widely used for microbial identification. Nonetheless, and due to the detection limit of this technique, a time-consuming pre-enrichment step is typically required before identification. In here we have developed a lab-on-a-chip device to concentrate cell suspensions and speed up the identification process in yeasts. The PNA-FISH protocol was optimized to target Saccharomyces cerevisiae, a common yeast that is very relevant for several types of food industries...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28144838/evidence-of-differential-mass-change-rates-between-human-breast-cancer-cell-lines-in-culture
#4
Elise A Corbin, Olaoluwa O Adeniba, Olivia V Cangellaris, William P King, Rashid Bashir
Investigating the growth signatures of single cells will determine how cell growth is regulated and cell size is maintained. The ability to precisely measure such changes and alterations in cell size and cell mass could be important for applications in cancer and drug screening. Here, we measure the mass growth rate of individual benign (MCF-10A), non-invasive (MCF-7), and highly-invasive malignant (MDA-MB-231) breast cancer cells. A micro-patterning technique was employed to allow for the long-term growth of motile cells...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28127655/compact-saw-aerosol-generator
#5
A Winkler, S Harazim, D J Collins, R Brünig, H Schmidt, S B Menzel
In this work, we discuss and demonstrate the principle features of surface acoustic wave (SAW) aerosol generation, based on the properties of the fluid supply, the acoustic wave field and the acoustowetting phenomena. Furthermore, we demonstrate a compact SAW-based aerosol generator amenable to mass production fabricated using simple techniques including photolithography, computerized numerical control (CNC) milling and printed circuit board (PCB) manufacturing. Using this device, we present comprehensive experimental results exploring the complexity of the acoustic atomization process and the influence of fluid supply position and geometry, SAW power and fluid flow rate on the device functionality...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28124762/frequency-controlled-wireless-shape-memory-polymer-microactuator-for-drug-delivery-application
#6
M A Zainal, A Ahmad, M S Mohamed Ali
This paper reports the wireless Shape-Memory-Polymer actuator operated by external radio frequency magnetic fields and its application in a drug delivery device. The actuator is driven by a frequency-sensitive wireless resonant heater which is bonded directly to the Shape-Memory-Polymer and is activated only when the field frequency is tuned to the resonant frequency of heater. The heater is fabricated using a double-sided Cu-clad Polyimide with much simpler fabrication steps compared to previously reported methods...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28124761/laboratory-and-clinical-reliability-of-conformally-coated-subretinal-implants
#7
Renate Daschner, Udo Greppmaier, Martin Kokelmann, Sandra Rudorf, Ralf Rudorf, Sebastian Schleehauf, Walter G Wrobel
Despite recent developments and new treatments in ophthalmology there is nothing available to cure retinal degenerations like Retinitis Pigmentosa (RP) yet. One of the most advanced approaches to treat people that have gone blind due to RP is to replace the function of the degenerated photoreceptors by a microelectronic neuroprosthetic device. Basically, this subretinal active implant transforms the incoming light into electric pulses to stimulate the remaining cells of the retina. The functional time of such devices is a crucial aspect...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28092011/microbubble-moving-in-blood-flow-in-microchannels-effect-on-the-cell-free-layer-and-cell-local-concentration
#8
David Bento, Lúcia Sousa, Tomoko Yaginuma, Valdemar Garcia, Rui Lima, João M Miranda
Gas embolisms can hinder blood flow and lead to occlusion of the vessels and ischemia. Bubbles in microvessels circulate as tubular bubbles (Taylor bubbles) and can be trapped, blocking the normal flow of blood. To understand how Taylor bubbles flow in microcirculation, in particular, how bubbles disturb the blood flow at the scale of blood cells, experiments were performed in microchannels at a low Capillary number. Bubbles moving with a stream of in vitro blood were filmed with the help of a high-speed camera...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28074385/use-of-a-cd-laser-pickup-head-to-fabricate-microelectrodes-in-polymethylmethacrylate-substrates-for-biosensing-applications
#9
Jehú López-Aparicio, Mathieu Hautefeuille, Sara Herrera-Domínguez, Adriana Razo-de-León, Mariel Cano-Jorge, Ixchetl Rojas-Benito, Mariana Centeno-Sierra, Tatiana Fiordelisio-Coll, Catalina Elizabeth Stern-Forgach
In this work, we report a simple fabrication method for microelectrodes on a polymethylmethacrylate substrate, using a low-cost laser platform based on a CD-DVD unit for direct rapid-prototyping. We used this laser microfabrication technique to etch any desired design on polymethylmethacrylate substrates to produce microchannels with controlled geometry, with a highly repeatable micron-scale resolution. Those shallow microchannels were then filled with a conductive paste of material of our choice that was converted into microelectrodes of desired shapes and geometries after drying...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28074384/microfluidic-gut-liver-chip-for-reproducing-the-first-pass-metabolism
#10
Aerim Choe, Sang Keun Ha, Inwook Choi, Nakwon Choi, Jong Hwan Sung
After oral intake of drugs, drugs go through the first pass metabolism in the gut and the liver, which greatly affects the final outcome of the drugs' efficacy and side effects. The first pass metabolism is a complex process involving the gut and the liver tissue, with transport and reaction occurring simultaneously at various locations, which makes it difficult to be reproduced in vitro with conventional cell culture systems. In an effort to tackle this challenge, here we have developed a microfluidic gut-liver chip that can reproduce the dynamics of the first pass metabolism...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28070698/drug-coated-microneedles-for-rapid-and-painless-local-anesthesia
#11
Sung-Hyun Baek, Ju-Hyung Shin, Yeu-Chun Kim
This study showed that drug-coated PLLA (Poly (L-lactide)) microneedle arrays can induce rapid and painless local anesthesia. Microneedle arrays were fabricated using a micro-molding technique, and the needle tips were coated with 290.6 ± 45.9 μg of lidocaine, the most widely used local anesthetic worldwide. A dip-coating device was newly designed for the coating step using an optimized coating formulation. Lidocaine coated on the arrays was released rapidly into PBS within 2 min, and its stability in storage lasted 3 weeks at 4, 25, and 37°C...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28070697/development-of-a-dsred-expressing-heparg-cell-line-for-real-time-monitoring-of-hepatocyte-like-cell-differentiation-by-fluorescence-imaging-with-application-in-screening-of-novel-geometric-microstructured-cell-growth-substrates
#12
Mihaela Uta, Livia E Sima, Patrik Hoffmann, Valentina Dinca, Norica Branza-Nichita
The bipotent nature of the HepaRG cell line is a unique property among human hepatoma-derived cells. Cell treatment with specific differentiation inducers results in a mixture of hepatocyte- and biliary-like cells, accompanied by upregulation of liver-specific proteins, drug metabolizing enzymes, transcription regulators, membrane receptors or innate immune response effectors. These features make the HepaRG cells a suitable and handy replacement for primary hepatocytes, to study hepatic functions in vitro. However, cell differentiation is a long, variable process, requiring special culture conditions, while the resulting mixed cell populations is usually a major drawback...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28070696/an-ionic-liquid-based-strain-sensor-for-large-displacement-measurement
#13
Grim Keulemans, Frederik Ceyssens, Robert Puers
A robust and low cost ionic liquid based strain sensor is fabricated for high strain measurements in biomedical applications (up to 40 % and higher). A tubular 5 mm long silicone microchannel with an inner diameter of 310 µm and an outer diameter of 650 µm is filled with an ionic liquid. Three ionic liquids have been investigated: 1-butyl-1-methylpyrrolidinium bis (trifluoromethylsulfonyl) imide, ethylammonium nitrate and cholinium ethanoate. When the channel is axially stretched, geometrical deformations change the electrical impedance of the liquid channel...
March 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/27975186/an-integrated-microfluidic-pcr-system-with-immunomagnetic-nanoparticles-for-the-detection-of-bacterial-pathogens
#14
Irisappan Ganesh, Buu Minh Tran, Yonghee Kim, Jaewon Kim, Hua Cheng, Nae Yoon Lee, Sungsu Park
There is growing interest in rapid microbial pre-concentration methods to lower the detection limit of bacterial pathogens of low abundance in samples. Here, we report an integrated microfluidic PCR system that enables bacterial cells of interest in samples to be concentrated prior to PCR. It consists of two major compartments: a preconcentration chamber for the immunomagnetic separation of bacterial cells, and a PCR chamber for the DNA amplification of the concentrated cells. We demonstrate the feasibility of the system for the detection of microbial pathogens by preconcentrating the human pathogen Escherichia coli O157:H7, and also amplifying its DNA...
December 2016: Biomedical Microdevices
https://www.readbyqxmd.com/read/27943003/maskless-wafer-level-microfabrication-of-optical-penetrating-neural-arrays-out-of-soda-lime-glass-utah-optrode-array
#15
Ronald W Boutte, Steve Blair
Borrowing from the wafer-level fabrication techniques of the Utah Electrode Array, an optical array capable of delivering light for neural optogenetic studies is presented in this paper: the Utah Optrode Array. Utah Optrode Arrays are micromachined out of sheet soda-lime-silica glass using standard backend processes of the semiconductor and microelectronics packaging industries such as precision diamond grinding and wet etching. 9 × 9 arrays with 1100μ m × 100μ m optrodes and a 500μ m back-plane are repeatably reproduced on 2i n wafers 169 arrays at a time...
December 2016: Biomedical Microdevices
https://www.readbyqxmd.com/read/27921279/biocompatibility-of-fluids-for-multiphase-drops-in-drops-microfluidics
#16
Aishah Prastowo, Alexander Feuerborn, Peter R Cook, Edmond J Walsh
This paper addresses the biocompatibility of fluids and surfactants in the context of microfluidics and more specifically in a drops-in-drops system for mammalian cell based drug screening. In the drops-in-drops approach, three immiscible fluids are used to manipulate the flow of aqueous microliter-sized drops; it enables merging of drops containing cells with drops containing drugs within a Teflon tube. Preliminary tests showed that a commonly-used fluid and surfactant combination resulted in significant variability in gene expression levels in Jurkat cells after exposure to a drug for four hours...
December 2016: Biomedical Microdevices
https://www.readbyqxmd.com/read/27909898/two-dimensional-polyaniline-nanostructure-to-the-development-of-microfluidic-integrated-flexible-biosensors-for-biomarker-detection
#17
Pei Liu, Yisi Zhu, Seung Hee Lee, Minhee Yun
In this work, we report a flexible field-effect-transistor (FET) biosensor design based on two-dimensional (2-D) polyaniline (PANI) nanostructure. The flexible biosensor devices were fabricated through a facile and inexpensive method that combines top-down and bottom-up processes. The chemically synthesized PANI nanostructure showed excellent p-type semiconductor properties as well as good compatibility with flexible design. With the 2-D PANI nanostructure being as thin as 80 nm and its extremely large surface-area-to-volume (SA/V) ratio due to the intrinsic properties of PANI chemical synthesis, the developed flexible biosensor exhibited outstanding sensing performance in detecting B-type natriuretic peptide (BNP) biomarkers, and was able to achieve high specificity (averagely 112 folds) with the limit of detection as low as 100 pg/mL...
December 2016: Biomedical Microdevices
https://www.readbyqxmd.com/read/27900618/3d-carbon-nanofiber-microelectrode-arrays-fabricated-by-plasma-assisted-pyrolysis-to-enhance-sensitivity-and-stability-of-real-time-dopamine-detection
#18
Wenwen Yi, Yuanyuan Yang, Parastoo Hashemi, Mark Ming-Cheng Cheng
In this paper, we have fabricated 3D carbon nanofiber microelectrode arrays (MEAs) with highly reproducible and rich chemical surface areas for fast scan cyclic voltammetry (FSCV). Carbon nanofibers are created from negative photoresist by a new process called dual O2 plasma-assisted pyrolysis. The proposed approach significantly improves film adhesion and increases surface reactivity. We showcase our sensor's compatibility with FSCV analysis by demonstrating highly sensitive and stable FSCV dopamine measurements on a prototype 4-channel array...
December 2016: Biomedical Microdevices
https://www.readbyqxmd.com/read/27864741/an-ultrasensitive-label-free-nanobiosensor-platform-for-the-detection-of-cardiac-biomarkers
#19
Durga Prakash Matta, Suryasnata Tripathy, Siva Rama Krishna Vanjari, Chandra Shekhar Sharma, Shiv Govind Singh
We report the fabrication of a label free nano biosensor platform comprising single nanofiber that is derived out of multi-walled carbon nanotubes (MWCNTs) embedded SU-8 photoresist, for the detection of three important human cardiac biomarkers viz., myoglobin (Myo), cardiac Troponin I (cTn I) and Creatine Kinase-MB (CK-MB). These composite nanofibers were synthesized using electrospinning process. Single nanofibers were aligned between pairs of electrodes in-situ during the electrospinning process. The target proteins were detected using chemiresistive detection methodology...
December 2016: Biomedical Microdevices
https://www.readbyqxmd.com/read/27834053/a-high-accuracy-cantilever-array-sensor-for-early-liver-cancer-diagnosis
#20
Jingjing Wang, Lihao Wang, Yinfang Zhu, Jinying Zhang, Ju Liao, Shuaipeng Wang, Jinling Yang, Fuhua Yang
Early liver cancer diagnosis has clinical significance in treating cancer. Joint detection of multiple biomarkers has been considered as an effective and reliable method for early cancer diagnosis. In this work, a novel biosensor based on microcantilever array was batch-fabricated for multiple liver cancer biomarkers detection with high sensitivity, high accuracy, high throughput, and high specification. A micro-cavity was designed in the free end of the cantilever for local reaction between antibody and antigen, which can dramatically reduce the effect of adsorption-induced stiffness coefficient k variation...
December 2016: Biomedical Microdevices
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