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We have equipped the Ionoptix Calcium and Contractility: Myocytes system for simultaneous measurements of pressurized blood vessel fluorescence and diameter. By visualizing the blood vessel on the microscope, IonOptix' edge detection software,SoftEdge, can track the outside and/or inside diameter of the blood vessel from the digitized frame while simultaneously recording fluorescence, most commonly from calcium probes. Using our interface box, the FSI, and a system manufactured byDMT or Living Systems that allows the pressurization of microvessels , we can provide real-time recording of all vessel myograph outputs, including pressure, force, temperature and pH, as well as calcium and diameter. We will also work with the manufacturer your myograph system to provide an integrated workstation capable of precise, synchronized data acquisition.
HyperSwitch Light Source
In cases where highest time resolution is essential, the IonOptix HyperSwitch Light Source is recommended. Wavelength switching is accomplished in less than 1msec and can be continuously alternated at rates as high as 250 pairs/sec. The HyperSwitch can also produce hardware video-locked wavelength switching.
This figure illustrates the optical path and components of the IonOptix HyperSwitch Dual Excitation Light Source. The light output of a 75 W xenon-arc bulb is formed into a converging beam using a parabolic reflector within the xenon housing. A front-surface beam steering mirror positions the focal point of the beam just beyond a galvo-driven mirror that rapidly alternates between two separate paths. In path 1, the now diverging xenon light is collimated by a quartz lens and is then steered into the “side” input of the excitation dichroic cube (EDC). In path 2, a second lens collimates the xenon light before it enters the “front” input of the EDC. In addition, the mirror may also be set to a third position that provides high speed shuttering of the excitation light by directing the light away from both input paths. Separate filters on each input of the EDC filter the xenon light to create the individual excitation wavelengths. A dichroic mirror inside the EDC passes the filtered path 2 light to the “rear” output of the EDC as well as reflects the filtered path 1 light to the same output. The output of the EDC is then focused on the end of a liquid light guide. The opposite end of the light guide is equipped with a microscope-coupling adapter thus presenting excitation light to the specimen. Microscope couplings are available for all commercial microscopes.
Two more recent innovations that are not illustrated in the figure are the Cube Flipper and the Filter Flipper. The cube flipper permits the EDC to be rotated out of the optical path so that all excitation light can be brought to the microscope. This feature permits quick alternation between dual excitation (i.e. fura-2) and single excitation (i.e. GFP) modes. The Filter Flipper is a manually controlled, 6-posidion filter wheel that is used to hold neutral density filters.
Excitation filters of your specification are included with each system and can be ordered as required.
IonWizard-Core and Analysis
IonWizard integrates the presentation of fluorescence traces and images, analog voltages, and cell length data under an intuitive interface. It analyzes raw data by performing ratio, ion, or linear calibration calculations. Fluorescence calculations include a comprehensive selection of background subtraction techniques. Specialized functions such as trace averaging, composite images, and transient analysis eliminate common extra work. Clipboarding and exporting of trace and image data eases integration with other programs. Extensive use of individual user templates and context-sensitive online help increases productivity.
Features
- Data Acquisition. Data acquisition via the SARCACQ, EDGACQ, and PMTACQ DLLs.
- Trace Display/Printing. Display multiple traces. Zoom-in on small details and scroll over whole trace. Print traces at any zoom level.
- Trace Analysis. Background subtraction, ratio and ion calculation. Analog and cell length calibrations. Digital trace filtering.
- Annotation. Mark experimental events, and make experimental notes both during acquisition and off-line.
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Image Support. Subtract backgrounds, calculate ratio and ion images, and mask out non-fluorescent background data. Move forward or backward through image sequences with the movie player. Images are time synchronized to pixel average traces. Make composite arrays of select images.
Clipboard/Export Support. Copy traces, single images or composite images to clipboard for figure making in third party graphics packages. Export trace data in ASCII format for analysis in third party data analysis applications.
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Transient Analysis. Automatic or manual marking of important data transients. Analyze transients to extract important parameters (baseline, peak value, etc.).
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Trace Averaging. Average trace data via several methods to remove random noise from repetitive signals.
Single File. All data, including images, is stored in a single data file for easy handling and rapid access.
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SoftEdge? Myocyte Cell Length Acquisition Module
The SoftEdge? Acquisition add-on extends the IonWizard Analysis Software into a full-featured, video-based cell edge length / blood vessel diameter acquisition system while allowing access to the analysis features of IonWizard during data collection. SoftEdge? works seamlessly with our new digital Myocam-S or the previously-offered analog Myocam camera as well as select variable-field rate cameras to allow flexible edge detection. It provides integrated support for continuous edge/length sampling at up to 500 measurements per second. For easy experiment setup, the SoftEdge? Acquisition Add-On provides on-screen display of live video and independent control of all edge parameters for both left and right edges. |