Publications by authors named "Jonathan Dion"
: Vestibular agnosia is characterized by a reduced or absent self-motion perception while demonstrating the presence of normal peripheral vestibular function following stimulation. This condition has previously been reported by previous authors in different populations and more recently in traumatic brain injury patients. However, the underlying mechanisms responsible for vestibular agnosia remain a matter of debate.
View Article and Find Full Text PDFBackground: The video head impulse test (vHIT) is vital in clinical setting for assessing vestibulo-ocular reflex (VOR) function in patients of all ages. However, how normal aging influence VOR gain and catch-up saccades remains unclear, thus leading to confusion in interpretation of vHIT results.
Objective: This study aims to compare VOR gain and saccades parameters (frequency, amplitude, and latency) between younger and older adults, while maintaining head velocity and acceleration within the same range.
Article Synopsis
- Monitoring the composition of commercial beverages is essential for maintaining quality, and on-line measurements allow for real-time optimization.
- A new method using ultrasound frequency analysis has been developed to measure ethanol and carbohydrate concentrations in liquid mixtures based on the distortion of ultrasound waves caused by the chemical composition.
- Multilinear regression achieved high accuracy in estimating these concentrations in various beverages, with potential for reduced error and no need for sample extraction.
Article Synopsis
- Controlling mixture composition is crucial for quality in many applications, requiring quick on-site measurements for real-time optimization.
- A new method using ultrasound technology measures the volume fraction of liquids in complex mixtures by analyzing distortion in ultrasound waveforms, which relate to chemical bonding.
- The technique was tested on mixtures of water, methanol, and ethanol, achieving high accuracy (correlation coefficients above 0.98) in two-component mixtures and decent accuracy in three-component mixtures, making it promising for process monitoring without needing sample prep.
Article Synopsis
- Analyte quantification in samples with complex matrix effects is difficult with traditional methods, but ultrasound can effectively penetrate such samples despite lacking detailed chemical information.
- Recent advancements in ultrasound contrast agents allow for specific concentration-based contrast within samples.
- A new type of smart biosensor using molecularly imprinted hydrogels has been developed, enabling precise detection and quantification of theophylline alongside interfering substances like caffeine, achieving a strong linear correlation in results.
Article Synopsis
- Analyte quantification in highly scattering biological media is difficult with traditional spectroscopic methods, but ultrasound can penetrate these samples despite offering limited chemical information.
- We developed hydrogel biosensors using antibody-linked cellulose polymers that change stiffness and size upon target recognition, resulting in detectable variations in ultrasonic frequency.
- This approach shows nM sensitivity for acetaminophen in various biofluids and is promising for point-of-care diagnostics due to its quick measurement time and minimal sample preparation requirements.