Crosscorrelation
Mostrando 25-36 de 107 artigos, teses e dissertações.
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25. Matched filtering in motion detection and discrimination.
When humans detect and discriminate visual motion, some neural mechanism extracts the motion information that is embedded in the noisy spatio-temporal stimulus. We show that an ideal mechanism in a motion discrimination experiment cross-correlates the received waveform with the signals to be discriminated. If the human visual system uses such a cross-correla
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26. Synchronization of motor units in human masseter during a prolonged isometric contraction.
1. The action potentials of concurrently active motor units in human masseter were recorded on several fine-wire intramuscular electrodes and synchronization was assessed by cross-correlation of their firing times. 2. Long recording sessions and a test of significance for peaks in histograms were used to enhance detection of synchrony. 3. Synchrony in masset
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27. Fluorescence lifetime imaging by asynchronous pump-probe microscopy.
We report the development of a scanning lifetime fluorescence microscope using the asynchronous, pump-probe (stimulated emission) approach. There are two significant advantages of this technique. First, the cross-correlation signal produced by overlapping the pump and probe lasers results in i) an axial sectioning effect similar to that in confocal and two-p
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28. Variations in the time course of the synchronization of intercostal motoneurones in the cat
1. Synchronization of intercostal motoneurones was studied by the construction of cross-correlation histograms which related the firing times of paired groups of efferent inspiratory or expiratory discharges recorded from filaments of the external or internal nerves of anaesthetized or decerebrate cats.
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29. Value of ICD-9-Coded Chief Complaints for Detection of Epidemics
To assess the value of ICD-9-coded chief complaints for early detection of epidemics, we measured sensitivity, positive predictive value, and timeliness of Influenza detection using a respiratory set (RS) of ICD-9 codes and an Influenza set (IS). We also measured inherent timeliness of these data using the cross-correlation function.
American Medical Informatics Association.
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30. Imaging Barriers to Diffusion by Pair Correlation Functions
Molecular diffusion and transport are fundamental processes in physical, chemical, biochemical, and biological systems. However, current approaches to measure molecular transport in cells and tissues based on perturbation methods such as fluorescence recovery after photobleaching are invasive, fluctuation correlation methods are local, and single-particle tr
The Biophysical Society.
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31. The detection of monosynaptic connexions from inspiratory bulbospinal neurones to inspiratory motoneurones in the cat.
Simultaneous recordings were made of the discharges of inspiratory bulbospinal neurones and phrenic or external intercostal alpha-motoneurones in the anaesthetized cat. The connexions between these neurones were studied by the construction of cross-correlation histograms from their discharges. Peaks observed in the cross-correlation histograms were divided i
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32. Investigating the origin of cyclic changes in limb volume using mercury-in-silastic strain gauge plethysmography in man.
1. Vasomotion, a phenomen frequently observed in skeletal muscle microcirculation, has been observed under physiological conditions and found enhanced during critical reduction of tissue perfusion due to hypoxic hypoxia, haemorrhage and local hypotension. We used a computer assisted non-invasive plethysmographic method to investigate periodic changes of limb
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33. Determination of Dissociation Constants in Living Zebrafish Embryos with Single Wavelength Fluorescence Cross-Correlation Spectroscopy
The quantification of biological interactions is very important in life sciences. Here we report for the first time, to our knowledge, the determination of a biomolecular dissociation constant (KD) in living zebrafish embryos at physiological protein expression levels. For that purpose, we extend the application of single wavelength fluorescence cross-correl
The Biophysical Society.
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34. Diffusion, Transport, and Cell Membrane Organization Investigated by Imaging Fluorescence Cross-Correlation Spectroscopy
Cell membrane organization is dynamic and is assumed to have different characteristic length scales. These length scales, which are influenced by lipid and protein composition as well as by the cytoskeleton, can range from below the optical resolution limit (as with rafts or microdomains) to far above the resolution limit (as with capping phenomena or the fo
The Biophysical Society.
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35. Determination of in Vivo Dissociation Constant, KD, of Cdc42-Effector Complexes in Live Mammalian Cells Using Single Wavelength Fluorescence Cross-correlation Spectroscopy*S⃞
The RhoGTPase Cdc42 coordinates cell morphogenesis, cell cycle, and cell polarity decisions downstream of membrane-bound receptors through distinct effector pathways. Cdc42-effector protein interactions represent important elements of cell signaling pathways that regulate cell biology in systems as diverse as yeast and humans. To derive mechanistic insig
American Society for Biochemistry and Molecular Biology.
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36. Cholesterol-dependent clustering of IL-2Rα and its colocalization with HLA and CD48 on T lymphoma cells suggest their functional association with lipid rafts
Immunogold staining and electron microscopy show that IL-2 receptor α-subunits exhibit nonrandom surface distribution on human T lymphoma cells. Analysis of interparticle distances reveals that this clustering on the scale of a few hundred nanometers is independent of the presence of IL-2 and of the expression of the IL-2R β-subunit. Clustering of IL-2Rα
The National Academy of Sciences.