Force Amplification
Force Amplification - Related Videos
09:44
Rapid Amplification of cDNA Ends
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2023
Source: Pablo Sanchez Bosch2, Sean Corcoran2 and Katja Brückner1,2,3 1Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research 2Department of Cell and Tissue Biology, 3Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA, USA Rapid Amplification of cDNA Ends (RACE) is a technique that allows amplification of full-length cDNA from mRNA by extending to the 3’ or 5’ end, even without prior knowledge of the sequence (Frohman et al.,...
10:12
Protein Misfolding Cyclic Amplification of Prions
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Cited by 7 •
2012
Protein misfolding cyclic amplification (PMCA) is an in vitro assay for the study of prion conversion and strain and species barriers. It can also be used as a prion detection assay.
02:41
Amplification of a Suicide Plasmid in a Bacterial Host
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2025
Source: Tomás, J. M., et al. Generation of Null Mutants to Elucidate the Role of Bacterial Glycosyltransferases in Bacterial Motility. J. Vis. Exp. (2022).This video demonstrates the initiator-dependent amplification of a suicide plasmid in E. coli. The plasmid, which carries an antibiotic resistance gene, replicates only in the presence of an initiator protein encoded by the host. After electroporation and incubation in recovery medium, the mixture is plated on antibiotic-containing agar.
02:48
Loop-Mediated Isothermal Amplification for Bacterial Gene Detection
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2025
Source: Domesle, K. J., et al. Loop-Mediated Isothermal Amplification for Screening Salmonella in Animal Food and Confirming Salmonella from Culture Isolation. J. Vis. Exp. (2020).This video demonstrates the loop-mediated isothermal amplification (LAMP) technique for detecting a target bacterial gene by amplifying DNA at a constant temperature. The reaction mixture is prepared by adding an isothermal master mix, specific primers for the target gene, and samples containing DNA templates. The...
03:13
Intermolecular Forces
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2020
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
FAQs
In a lever, output force depends on the relative lengths of the input and output arms. A longer input arm can create greater turning effect, or torque, at the load, but the load moves through a shorter distance. Gears use a comparable tradeoff by changing torque and rotational motion, allowing designers to match force requirements to available input motion.
Hydraulic amplification depends on pressure transmission and piston area. A force applied to a smaller piston creates fluid pressure, while a larger piston converts that pressure into a greater output force. The larger piston therefore travels a shorter distance for the same transferred work. Piston sizing becomes central when designing equipment for lifting, clamping, or pressing.
Ideal force amplification does not create extra work. When output force rises, output displacement falls so input and output work remain balanced. Real systems produce less useful output because friction and other losses consume part of the input. Engineers therefore evaluate not only the force ratio but also how efficiently the mechanism transfers the applied effort.
Levers and gears primarily reshape mechanical advantage through geometry and torque, whereas hydraulic arrangements transmit pressure through fluid between pistons. The choice depends on the required type of motion and load interaction. A lever or gear train may suit direct mechanical movement, while a hydraulic arrangement can deliver amplified force through piston motion for lifting, clamping, or pressing.
A practical design analysis starts by relating the required load movement to the available input movement. The engineer then selects a lever, gear arrangement, or hydraulic piston pair and accounts for the force-distance tradeoff. Friction and other losses must be included because they reduce the output achieved in real operation.
Engineering applications include presses and jacks for load handling, brakes for force application, robotic actuators for controlled movement, and assistive devices that make larger loads manageable. Across these systems, the relevant outcome is not simply a high output force: designers must also consider reduced displacement and losses when assessing practical performance.