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Sudden breakdown in linear response of a rotationally driven magnetic microparticle and application to physical and chemical microsensing.
In this work, sensing magnetic microparticles were used to probe both the local pH and the viscosity-dependent nonlinear rotational behavior of the particles. The latter resulted from a criticalExpand
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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 ofExpand
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Single bacterial cell detection with nonlinear rotational frequency shifts of driven magnetic microspheres
Shifts in the nonlinear rotational frequency of magnetic microspheres, driven by an external magnetic field, offer a dynamic approach for the detection of single bacterial cells. We demonstrate thisExpand
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Compact sensor for measuring nonlinear rotational dynamics of driven magnetic microspheres with biomedical applications
The nonlinear rotation response of a magnetic particle occurs when a driving magnetic field, used to rotate the magnetic particle, exceeds a critical frequency. This type of nonlinear rotationalExpand
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Nanoparticle Induced Cell Magneto-Rotation: Monitoring Morphology, Stress and Drug Sensitivity of a Suspended Single Cancer Cell
Single cell analysis has allowed critical discoveries in drug testing, immunobiology and stem cell research. In addition, a change from two to three dimensional growth conditions radically affectsExpand
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Physiochemical microparticle sensors based on nonlinear magnetic oscillations
Recently, the nonlinear rotation of single magnetic particles has emerged as a tool to measure physical parameters on the micro-scale. In this paper, detailed theoretical analyses are carried out forExpand
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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 inExpand
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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.Expand
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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 onExpand
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Microrheology with modulated optical nanoprobes (MOONs)
Metal-capping of one hemisphere of a nano or microparticle breaks the particle's optical symmetry, allowing its orientation to be tracked using fluorescence and reflection. Tracking orientation andExpand
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