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Find out how electrocuting chickensgetting laboratory assistants to put their hands in buckets of salinetaking the ECG of a horses and then observing their open heart surgeyinduction of indiscriminate angina attacksand hypothermic dogs have helped to improve our understanding of the ECG as a clinical tool.
He derived the word from the Greek for amber electra. It was known from ancient times that amber when rubbed could lift light materials.
Gilbert added other examples such as sulphur and was describing what would later be known as 'static electricity' to distinguish it from the more noble magnetic force which he saw as part of a philosophy to destroy forever the prevailing Aristotlean view of matter. De Magnete, magneticisique corporibus, et de magno magnete tellure.
Browne calls the attractive force "Electricity, that is, a power to attract strawes or light bodies, and convert the needle freely placed".
He is also the first to use the word 'computer' - referring to people who compute calendars. London Otto Von Guericke builds the first static electricity generator.
He had worked on his ideas in the s but had abandoned publication because of the persecution of other radical thinkers such as Galileo.
William Harvey had developed similar ideas but they were never published. De Homine Treatise of Man ; On removing the brain all movement stopped which would be in keeping with Descarte's theory but then, when the frog was dissected and a severed nerve end stimulated with a scalpel the muscles twitched.
This proved that movement of a muscle could occur without any connection to the brain and therefore the transmission of 'animal spirits' was not necessary.
Swammerdam's ideas were not widely known and his work was not published until after his death. However, he wrote many letters and his friend, Nicolaus Steno, did attack the Cartesian ideas in a lecture in Paris in Boerhaave published Swammerdam's 'Book of Nature' in the s which was translated into English in One experiment suspended the muscle on a brass hook inside a glass tube with a water droplet to detect movement and 'irritated' the nerve with a silver wire.
This produced movement of the muscle and it may have been due to the induction of a small electrical charge - although Swammerdam would have been unaware of this.
In the diagram opposite - a glass tube, b muscle, c sliver wire, d brass wire, e drop of water, f investigator's hand. He demonstrates the transfer of static electrical charge to a cork ball across metres of wet hemp thread.
Later he found that the transfer could be achieved over greater distances by using brass wire. The jar is named the 'Leyden Jar' after the place of its discovery. Ewald Georg von Kliest of Pomerania invented the same device independently.
He showed that the properties of the shock were similar to those from a Leyden jar in that it could be conducted or insulated with appropriate materials.Cultured meat, also called clean meat, synthetic meat or in vitro meat, is meat produced by in vitro cultivation of animal cells, instead of from slaughtered animals.
It is a form of cellular agriculture.. Cultured meat is produced using many of the same tissue engineering techniques traditionally used in regenerative medicine.
The concept of cultured meat was popularized by Jason Matheny in. For those who dedicate their lives to sporting excellence, there's no greater prize than winning. Seduced by fame and lucrative sports deals, many have been pressured into a dangerous drug culture.
U.S. Senate Committee on Banking, Housing, and Urban Affairs. Second Staff Report on U.S. Chemical and Biological Warfare-Related Dual-Use Exports to Iraq and The Possible Impact on the Health Consequences of the War.
HealthCentral combines medically vetted health information with personal stories about life with chronic health conditions to give you the tools and inspiration to make positive changes, no matter you. Investigation of Frog Gastrocnemius Muscle Contraction.
Print Reference this. The second part of the experiment investigated how the muscle contraction occurs in presence of multiple stimuli close in time to each other with constant 2 volt stimulus.
Physiology Lab 1: Skeletal muscle lab manual was followed to conduct the experimental. Put on safety goggles, gloves, and a lab apron. Place a frog on a dissection tray. Dissect a thigh, and trace one nerve into a leg muscle.
Note the size and texture of the leg muscles. Dispose of your materials according to the directions from your teacher. Clean up your work area and wash your hands before leaving the lab.