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Optical tweezers ba...
Optical tweezers based force measurement system for quantitating binding interactions : system design and application for the study of bacterial adhesion
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- Fällman, Erik (author)
- Umeå universitet,Institutionen för fysik
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- Schedin, Staffan (author)
- Umeå universitet,Institutionen för tillämpad fysik och elektronik
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- Jass, Jana (author)
- Umeå universitet,Institutionen för molekylärbiologi (Medicinska fakulteten)
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- Andersson, Magnus (author)
- Umeå universitet,Institutionen för fysik
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- Uhlin, Bernt Eric (author)
- Umeå universitet,Institutionen för molekylärbiologi (Medicinska fakulteten)
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- Axner, Ove (author)
- Umeå universitet,Institutionen för fysik
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(creator_code:org_t)
- Elsevier, 2004
- 2004
- English.
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In: Biosensors & bioelectronics. - : Elsevier. - 0956-5663 .- 1873-4235. ; 19:11, s. 1429-1437
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- An optical force measurement system for quantitating forces in the pN range between micrometer-sized objects has been developed. The system was based upon optical tweezers in combination with a sensitive position detection system and constructed around an inverted microscope. A trapped particle in the focus of the high numerical aperture microscope-objective behaves like an omnidirectional mechanical spring in response to an external force. The particle’s displacement from the equilibrium position is therefore a direct measure of the exerted force. A weak probe laser beam, focused directly below the trapping focus, was used for position detection of the trapped particle (a polystyrene bead). The bead and the condenser focus the light to a distinct spot in the far field, monitored by a position sensitive detector. Various calibration procedures were implemented in order to provide absolute force measurements. The system has been used to measure the binding forces between Escherichia coli bacterial adhesins and galabiose-functionalized beads
Subject headings
- NATURVETENSKAP -- Biologi -- Biofysik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biophysics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Keyword
- Force measurements
- Optical tweezers
- Bacterial adhesion
Publication and Content Type
- ref (subject category)
- art (subject category)
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