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Search Publications by: Darwin R. Reyes (Fed)

Displaying 26 - 50 of 108

Live quantification of cell viability via neutral red uptake using lens-free imaging

October 27, 2019

Author(s)

Brian J. Nablo, Jungjoon Ahn, Kiran Bhadriraju, Jong M. Lee, Darwin Reyes-Hernandez

We present the quantification of cell viability during neutral red (NR) uptake with a compact lens-free system utilizing two light sources. Conventionally, the NR uptake assay determines cell viability based on the accumulation of NR within lysosomes and

Generating multiscale gold nanostructures on glass without sidewall deposits using minimal dry etching steps

March 19, 2019

Author(s)

Saugandhika S. Minnikanti, Jungjoon Ahn, Yaw S. Obeng, Darwin Reyes-Hernandez

The advent of new technologies in the nanoscience arena require new and improved methods for the fabrication of multiscale features (e.g. from micro- to nanometer scales). Specifically, biological applications generally demand the use of transparent

Proceedings of the First Workshop on Standards for Microfluidics

January 28, 2019

Author(s)

Darwin R. Reyes-Hernandez, Henne van Heeren

In the last two decades, the microfluidics/lab-on-a-chip field has evolved from the concept of micro total analysis systems, where systems with integrated pretreatment and analysis of chemicals were envisioned, to what is known today as lab-on-a-chip

The Art in Science of MicroTAS: 10 Years of Miniaturized Art

March 26, 2018

Author(s)

Darwin R. Reyes-Hernandez

MICROFABRICATION OF A 3D, ELASTIC CELL MICROENVIRONMENT WITH NANOSCALE PRECISION USING LAYER-BY- LAYER DEPOSITION

October 22, 2017

Author(s)

Markela Ibo, Kiran Bhadriraju, Darwin Reyes-Hernandez

Here we present a unique method to generate a customized cell microenvironment that allows for the positioning of specific components of the extracellular matrix, and other polyelectrolytes, at a precise distance from the matrix surface; thus, providing a

Uncovering the Contribution of Microchannel Deformation to Impedance-based Flow Rate Measurements

September 29, 2017

Author(s)

Pengfei Niu, Brian J. Nablo, Kiran Bhadriraju, Darwin Reyes-Hernandez

Here we describe the exact processes occurring between two metallic electrodes when measuring volumetric flow rate by electrical impedance in polydimethylsiloxane (PDMS) microchannel. A considerable fraction of the change in impedance, due to change of

Fibronectin in Layer-by-Layer Assembled Films Switches Tumor Cells between 2D and 3D Morphology

September 6, 2017

Author(s)

Kiran Bhadriraju, Jennifer S. Hong, Steven Lund, Darwin Reyes-Hernandez

Cells in tissues dynamically sense and modulate the adhesive and mechanical properties of their surroundings, according to the functional requirements of normal or diseased tissue. In this study, we show that the migratory and morphological responses of a

The 2016 edition of the Art in Science of MicroTAS

April 21, 2017

Author(s)

Darwin R. Reyes-Hernandez

Dublin, Ireland beheld The 20th International Conference of Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2016) from October 23 to 27, 2016. The conference not only included a great technical program, but also outreach activities, an

Thin-Film Electrodes on Polyester Porous Membranes for Flexible Electronics

February 1, 2017

Author(s)

Aveek Gangopadhyay, Brian J. Nablo, Rao Mulpuri, Darwin Reyes-Hernandez

FINE-TUNING ELECTRICAL FLOW RATE SENSING IN DEFORMABLE CHANNELS

October 9, 2016

Author(s)

Pengfei Niu, Brian J. Nablo, Kiran Bhadriraju, Darwin Reyes-Hernandez

Here we present conclusive proof that when using electrical impedance to measure volumetric flow rate in polydimethylsiloxane (PDMS) microchannels a considerable fraction of the change in impedance, due to change in flow rate, is caused by the variation in

From Microgalaxies to Micro-oceans to Warhols Cellular Images: The Art in Science of MicroTAS 2015

March 31, 2016

Author(s)

Darwin R. Reyes-Hernandez

SIMULTANEOUS DIELECTROPHORETIC TRAPPING OF CELL ON OPPOSITE SIDES OF A PERMEABLE MEMBRANE

October 25, 2015

Author(s)

Brian J. Nablo, Darwin Reyes-Hernandez

Molecular transport through permeable membranes offers a unique opportunity to investigate cellular responses to nutrients, drugs, or toxins delivered to the culture's apical and/or basal sides as well as cellular migration events. Herein, we present the

The Art in Science of MicroTAS: the 2014 issue

April 14, 2015

Author(s)

Darwin R. Reyes-Hernandez

For the 7th year in a row the Art in Science award competition, sponsored by Lab on a Chip and the National Institute of Standards and Technology (NIST), took place at the 18th International Conference of Miniaturized Systems for Chemistry and Life