Self-assembled magnetic bead biosensor for measuring bacterial growth and antimicrobial susceptibility testing.

Bacterial antibiotic resistance is one of the major concerns of modern healthcare worldwide, and the development of rapid, growth-based, antimicrobial susceptibility tests is key for addressing it. The cover image shows a self-assembled asynchronous magnetic bead rotation (AMBR) biosensor developed for rapid detection of bacterial growth. Using the biosensors, the minimum inhibitory concentration of a clinical E.

Asynchronous magnetic bead rotation microviscometer for rapid, sensitive, and label-free studies of bacterial growth and drug sensitivity.

The long turnaround time in antimicrobial susceptibility testing (AST) endangers patients and encourages the administration of wide spectrum antibiotics, thus resulting in alarming increases of multidrug resistant pathogens. A method for faster detection of bacterial proliferation presents one avenue toward addressing this global concern. We report on a label-free asynchronous magnetic bead rotation (AMBR) based viscometry method that rapidly detects bacterial growth and determines drug sensitivity by measuring changes in the suspension's viscosity.

Vascular response to coronary artery stenting in mature and juvenile swine.

Purpose: The objective of this study was to investigate potential differences in vascular response to stenting of coronary arteries with bare metal (BMS) and drug-eluting (DES) stents in juvenile vs. mature swine.

Methods And Materials: Twenty-one mature (> 3 years) and 22 juvenile (6-9 months) Yucatan swine were implanted with 3 × 12-mm XIENCE V DES and ML VISION BMS in coronary arteries.

Asynchronous magnetic bead rotation (AMBR) biosensor in microfluidic droplets for rapid bacterial growth and susceptibility measurements.

Inappropriate antibiotic use is a major factor contributing to the emergence and spread of antimicrobial resistance. The long turnaround time (over 24 hours) required for clinical antimicrobial susceptibility testing (AST) often results in patients being prescribed empiric therapies, which may be inadequate, inappropriate, or overly broad-spectrum. A reduction in the AST time may enable more appropriate therapies to be prescribed earlier.

High frequency asynchronous magnetic bead rotation for improved biosensors.

Biosensors with increasingly high sensitivity are crucial for probing small scale properties. The asynchronous magnetic bead rotation (AMBR) sensor is an emerging sensor platform, based on magnetically actuated rotation. Here the frequency dependence of the AMBR sensor's sensitivity is investigated.

Characterization of vascular injury responses to stent insertion in an ex-vivo arterial perfusion model.

Purpose: To develop an ex-vivo arterial perfusion model to evaluate vascular responses to bare metal stents (BMS) and drug-eluting stents (DES) in porcine carotid arteries.

Materials And Methods: Porcine carotid arteries with BMS or DES were cultured under hemodynamic stimuli for 24 hours and 72 hours. Vascular responses of arteries with stents were assessed by cellular functionality and gene expression and compared with a noninjured (NI) control group at each time point.

Microfluidic chemical analysis systems.

The field of microfluidics has exploded in the past decade, particularly in the area of chemical and biochemical analysis systems. Borrowing technology from the solid-state electronics industry and the production of microprocessor chips, researchers working with glass, silicon, and polymer substrates have fabricated macroscale laboratory components in miniaturized formats. These devices pump nanoliter volumes of liquid through micrometer-scale channels and perform complex chemical reactions and separations.

Monitoring the growth and drug susceptibility of individual bacteria using asynchronous magnetic bead rotation sensors.

Continuous growth of individual bacteria has been previously studied by direct observation using optical imaging. However, optical microscopy studies are inherently diffraction limited and limited in the number of individual cells that can be continuously monitored. Here we report on the use of the asynchronous magnetic bead rotation (AMBR) sensor, which is not diffraction limited.