Photomultiplier Bead Tracking
Photomultiplier Bead Tracking - Related Videos
08:19
Tracking Morphogenetic Tissue Deformations in the Early Chick Embryo
0 Views •
Cited by 11 •
2011
This article describes surface labeling and ex ovo tissue culture in the early chick embryo. Techniques amenable to time-lapse bright field, fluorescence, and optical coherence tomography imaging are presented. Tracking surface labels with high spatiotemporal resolution enables kinematic quantities such as morphogenetic strains (deformations) to be calculated in both two and three dimensions.
05:55
Multiple Object Tracking
0 Views •
2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University In a staggeringly complex and engaging world, it is crucial to selectively process some stimuli at the expense of others. Experimental psychologists call this ability attention. Specifically, visual attention refers to the ability to selectively process aspects of a visual scene. Many paradigms used to study visual attention involve brief, punctuated, and repeated trials. However, everyday situations often place sustained demands...
11:52
Microbubble Fabrication of Concave-porosity PDMS Beads
0 Views •
Cited by 2 •
2015
Procedures used to generate microstructured concave-porosity polydimethylsiloxane beads are presented. Effects of electrolyte concentration and identity within the aqueous phase are particularly emphasized.
03:06
Isolating Murine Primary Oligodendrocytes Using Immunomagnetic Beads
0 Views •
2025
This video demonstrates a method to isolate primary oligodendrocyte cells from a neural cell suspension obtained from a mouse pup using magnetic separation. The technique employs magnetic beads coated with antibodies specific to oligodendrocyte antigens, enabling selective isolation of these cells.
04:08
Bead Sprouting Assay for Early-Stage Angiogenesis Assessment: An In Vitro Bead-Based Model to Study Endothelial Sprouting in the Presence of Pericytes
0 Views •
2025
This video demonstrates a modified microcarrier beads-based assay incorporating pericytes to study endothelial sprouting during the early stages of angiogenesis. The assay provides an in vitro experimental model to understand molecular mechanisms of angiogenesis and the effect of anti-angiogenetic therapeutics.
FAQs
The detection chain preserves a time-resolved record of bead behavior. Excitation light causes the fluorescent bead to emit photons, and the photomultiplier tube converts those weak emissions into electrical pulses. Researchers then analyze the pulse signal over time, using changes in the recorded signal to determine how the bead’s position and motion change within the biological system.
Photomultiplier sensitivity matters because biological measurements may produce only faint fluorescence. By collecting and converting weak optical signals into electrical pulses, the detector can register bead behavior that might otherwise be missed. This sensitivity is especially useful when the experimental goal is to resolve small-scale transport or interactions rather than simply observe a strongly fluorescent object.
Rapid signal detection allows the measurement to follow changes that occur quickly. In bead tracking, the relevant record is not only whether fluorescence is present, but also how the detected signal changes over time. That temporal information helps researchers examine fast bead movements associated with intracellular transport or cytoskeletal dynamics at cellular and subcellular scales.
Its main advantage is the combination of high sensitivity and rapid signal detection. A photomultiplier can collect weak optical signals from fluorescent beads and convert them into analyzable electrical pulses. Consequently, the technique can reveal faint or fast movements that may be difficult to resolve with conventional imaging, expanding measurements of microscopic biological behavior.
A basic workflow starts with a fluorescent bead and excitation light. The bead emits photons, which are collected by a photomultiplier tube. The tube converts the optical signal into electrical pulses, and analysis of those pulses over time yields information about bead position and motion. This sequence connects optical labeling to measurable biological behavior.
In biology, researchers can apply the method to molecular motors, cytoskeletal dynamics, intracellular transport, and interactions involving microscopic beads. These applications allow the tracked signal to serve as a readout of activity at cellular or subcellular scales. The approach is particularly relevant when bead-associated movement or transport is the measured biological behavior.
The measured record can provide bead position and motion over time, while the experimental context can connect those observations with interactions, intracellular transport, or mechanical forces. This makes the technique useful for relating a microscopic signal to biological activity and for examining more than whether fluorescence is simply present or absent.
Following fluorescent bead signals over time helps researchers examine movement linked to molecular motors and cytoskeletal dynamics. Because these processes occur at cellular or subcellular scales, the ability to detect weak fluorescence and rapid changes is important. The resulting measurements can support studies of how microscopic motion and transport contribute to biological activity.