Alma De León-Hernández

ORCID: 0000-0001-7905-3380
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Research Areas
  • Cephalopods and Marine Biology
  • Analytical Chemistry and Sensors
  • SARS-CoV-2 detection and testing
  • Force Microscopy Techniques and Applications
  • Pressure Ulcer Prevention and Management
  • Ergonomics and Musculoskeletal Disorders
  • Microfluidic and Bio-sensing Technologies
  • Acoustic Wave Resonator Technologies
  • Microfluidic and Capillary Electrophoresis Applications
  • Molecular Biology Techniques and Applications
  • Thermography and Photoacoustic Techniques
  • Ultrasonics and Acoustic Wave Propagation
  • Biosensors and Analytical Detection
  • Diabetic Foot Ulcer Assessment and Management
  • Photoacoustic and Ultrasonic Imaging

Universidad Nacional Autónoma de México
2017-2022

<sec> <title>BACKGROUND</title> Pressure ulcers (PU) are a severe health problem with social and repercussions. Wheelchair users susceptible to developing PU, so they shall use cushion relieve pressure, distribute weight evenly, increase the contact area. Pressure-relieving cushions at affordable prices still need. Custom-contoured were developed using map pressure address this </sec> <title>OBJECTIVE</title> The objectives of study (1) develop methodology manufacture custom-contoured (2)...

10.2196/preprints.68612 preprint EN 2024-11-10

In this work, we present a device for determination of the thermal diffusivity using oblique reflection wave within solid slab that is in contact with medium to be characterized. By near critical angle under assumption waves obey Snell's law refraction square root diffusivities, unknown obtained by simple formulae. Experimentally, sensor response measured photothermal beam deflection technique results compact no laser probing sample. We describe theoretical basis and provide experimental...

10.1063/1.4998983 article EN Review of Scientific Instruments 2017-08-01

Analyzing the electrical double layer (EDL) in impedance spectroscopy (EIS) measurement at low frequencies remains a challenging task for sensing purposes. In this work, we propose two approaches to deal with EDL measuring particles and non-adherent cells an electrolytic suspension. The first approach is simple procedure compute normalized spectrum named dispersed medium index (DMi). second EIS modeling through equivalent electric circuit based on so-called effective capacitance (Cef), which...

10.3390/bioengineering9110697 article EN cc-by Bioengineering 2022-11-16

Abstract In this work, a microfluidic device with three-electrode system is used to measure the electrical impedance spectrum of micron-sized particles suspended in Phosphate Buffered Saline (PBS). We use polymer 15 μm and 48 diameter, as they can mimic biological cells suspension. The main purpose study influence particle concentration on parameters establish basis for cell suspensions assays. An electric equivalent circuit model describe experimental data. Results show high dependence mass...

10.1088/1742-6596/1723/1/012045 article EN Journal of Physics Conference Series 2021-01-01
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