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Wednesday, September 17, 2014
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Low-volume on-chip single sperm cell analysis
Pickrahn I. E. ,Schmidt-Gann G., Kroneis T.

We performed low-volume on-chip DNA typing of single sperm cells isolated by means of laser microdissection. 16plex PCR was successful in 39 of 40 single cell samples yielding a mean PCR efficiency of 62.8%. In addition, we were able to identify a single-cell sample containing more than one cell enabling us to monitor the quality of the whole procedure, and hence, exclude “contaminated” samples from further analysis.

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Sequence-independent Selective Amplification of mRNAs over rRNAs
John Arrand1, Sim Sihota1, Wenbin Wei1 and Guido Krupp2

Standard mRNA amplifications for "All-Exon" microarrays and for bacterial RNAs are impossible with small samples and with degraded RNAs, because removal of rRNAs must precede universal, non-selective RNA amplification. This pre-treatment with magnetic beads is cumbersome, requires high amounts of starting material, is not universal for all species and degraded RNAs are not suitable.

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Novel Concept of Microarray Construction and their Application in Biology
B. Cegielska, M. K. Chmielewski, W.T. Markiewicz, M. Figlerowicz

For microarrays produced using spotting technologies, much attention has to be given to the development of slide surfaces, attachment chemistries, and spotting solutions. Application of the optimal and reliable methods ensuring effective binding of DNA probes with slide surface is one of the key factors warranting high quality results. Developments in the field of microarrays occur at a rapid pace and some novel approaches may offer suggestions of new strategies.

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Sub-classification of Colorectal Cancer Using Surface Antigen Antibody Microarray and Fluorescence Multiplexing
Jerry Zhou, Larissa Belov, Pauline Huang, Joo-Shik Shin, Michael J. Solomon, Pierre Chapuis, Les Bokey, Charles Chan and Richard I. Christopherson

Colorectal cancer (CRC) is the second most frequent cause of cancer deaths in Australia. Even after resection up to 50% of patients relapse. In an attempt to prevent recurrences chemotherapy is administered to high risk patients. However, as few as 10-20% patients genuinely benefit because the clinical course for individuals with CRC remains difficult to predict, largely due to prognostically heterogeneous groups within same-stage tumour categories.

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Hepatitis B virus (HBV) and Human immunodeficiency virus (HIV) antibodies detected by peptide microarrays
ahmed Abd El Wahed1, Ulrike Beutling2, Ronald Frank2, Gerhard Hunsmann1, and Hans-Joachim Fritz3

HBV and HIVenv chips with overlapping oligopeptides encompassing the full amino acid sequences of HBV and HIV polypeptides were produced. In addition, a chip displaying a library of random 4608 different 15-mers peptides (4608-RPL) was prepared. Both chips were used for analyzing monoclonal antibodies and sera from HIV- and HBV-infected individuals. 4608-RPL could be used for identifying target sequences of antibodies without prior knowledge of the corresponding immunizing antigen.

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System-level Simulation of Liquid Filling in Microfluidic Chips
Hongjun Song, Yi Wang, and Kapil Pant

The overall objective of our work is to develop a system-level model and simulation framework for investigating the liquid filling process (including the filling time, filling pattern/status, flow velocity/pressure etc.) in complex microfluidic networks with order-of-magnitude speedup over the high-fidelity simulations and without appreciably compromising analysis accuracy.

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EXPERIMENTAL CHARACTERIZATION OF A METHOD TO REVERSIBLY BOND MICROFLUIDIC DEVICES THROUGH MAGNETIC FORCES
Francesco Piraino, Matteo Moretti, Alberto Redaelli, Marco Rasponi

A method based on magnetic forces to reversibly bond glass slides to PDMS microfluidic devices has been developed and experimentally characterized. Results show a reliable tightness in normal laboratory applications.

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Pressure Driven HepG2 cells Focusing on a Microchip
Paul-Emile POLENI, Olivier DUCLOUX, Serge OSTROVIDOV, Hiroyuki FUJITA, Teruo FUJII

We present a pressure driven microfluidic system devoted to concentration of cells in localized clusters ready for 3D cell culture in a microchamber. Cells are flown back and forth into the microchamber by pressurization/de-pressurization of two air caps symmetrically placed at two ends of a microchannel. The symmetry of the flow induces the presence of a dead volume in the cell culture chamber, favouring a rapid cell trapping and aggregation.

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Controlled Synthesis and Manipulation of Self-Assembled Peptide Nano Spheres by Microfluidic Dielectrophoresis (DEP)
Nikolaj O. Christiansen, Mohammad Ajine, Jaime Castillo, Maria Dimaki & Winnie E. Svendsen

The self-assembled peptides as building blocks are excellent candidates for applications in biomedical nanotechnology because of their chemical diversity, flexibility, biocompatibility and stability. This work shows a stable synthesis in liquid and that is's posible to manipulate them using positive DEP.

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Showing Results 31 - 40 of 128
Scientific News
Blood Cleanser for Sepsis
Dialysis-like ‘biospleen’ quickly filters bacteria, fungi and toxins.
Stanford Engineers Aim to Connect the World with Ant-sized Radios
Costing just pennies to make, tiny radios-on-a-chip are designed to serve as controllers or sensors for the 'Internet of Things.'
Lab on a Breathing Chip
Human nasal epithelial cells, cultured on a microchip, react to air pollutants just like they would in the upper airway.
Micropumps for Lab-on-a-Chip Disease Diagnosis
Reliable, inexpensive, programmable pumps could help make the diagnosis of many global life-threatening diseases easy and affordable.
Novel Chip-based Platform Could Simplify Measurements of Single Molecules
A nanopore-gated optofluidic chip combines electrical and optical measurements of single molecules onto a single platform.
Ingested Nanoparticles May Damage Liver
Although nanoparticles in food, sunscreen and other everyday products have many benefits, researchers from Cornell are finding that at certain doses, the particles might cause human organ damage.
Single-Cell Analysis Holds Promise for Stem Cell and Cancer Research
UCSF researchers use microfluidic technology to probe human brain development.
Researchers Invent Nanotech Microchip to Diagnose Type-1 Diabetes
The cheap, portable, microchip-based test could speed up diagnosis and enable studies of how the disease develops.
Revealing the Role of “Precocious” Dendritic Cells in Inflammatory Response
Discovery makes it possible for researchers to explore how these “precocious” cells escalate the body’s immune response when the body is under attack.
New NIST Metamaterial Gives Light a One-Way Ticket
The device could someday play a role in optical information processing and in novel biosensing devices.
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