{"action":"created","issue":{"url":"https://api.github.com/repos/openworm/sibernetic/issues/127","repository_url":"https://api.github.com/repos/openworm/sibernetic","labels_url":"https://api.github.com/repos/openworm/sibernetic/issues/127/labels{/name}","comments_url":"https://api.github.com/repos/openworm/sibernetic/issues/127/comments","events_url":"https://api.github.com/repos/openworm/sibernetic/issues/127/events","html_url":"https://github.com/openworm/sibernetic/issues/127","id":266846121,"number":127,"title":"Worm body modelling and mechanics  - parameters, values etc.","user":{"login":"a-palyanov","id":1803774,"avatar_url":"https://avatars2.githubusercontent.com/u/1803774?v=4","gravatar_id":"","url":"https://api.github.com/users/a-palyanov","html_url":"https://github.com/a-palyanov","followers_url":"https://api.github.com/users/a-palyanov/followers","following_url":"https://api.github.com/users/a-palyanov/following{/other_user}","gists_url":"https://api.github.com/users/a-palyanov/gists{/gist_id}","starred_url":"https://api.github.com/users/a-palyanov/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/a-palyanov/subscriptions","organizations_url":"https://api.github.com/users/a-palyanov/orgs","repos_url":"https://api.github.com/users/a-palyanov/repos","events_url":"https://api.github.com/users/a-palyanov/events{/privacy}","received_events_url":"https://api.github.com/users/a-palyanov/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":{"login":"a-palyanov","id":1803774,"avatar_url":"https://avatars2.githubusercontent.com/u/1803774?v=4","gravatar_id":"","url":"https://api.github.com/users/a-palyanov","html_url":"https://github.com/a-palyanov","followers_url":"https://api.github.com/users/a-palyanov/followers","following_url":"https://api.github.com/users/a-palyanov/following{/other_user}","gists_url":"https://api.github.com/users/a-palyanov/gists{/gist_id}","starred_url":"https://api.github.com/users/a-palyanov/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/a-palyanov/subscriptions","organizations_url":"https://api.github.com/users/a-palyanov/orgs","repos_url":"https://api.github.com/users/a-palyanov/repos","events_url":"https://api.github.com/users/a-palyanov/events{/privacy}","received_events_url":"https://api.github.com/users/a-palyanov/received_events","type":"User","site_admin":false},"assignees":[{"login":"a-palyanov","id":1803774,"avatar_url":"https://avatars2.githubusercontent.com/u/1803774?v=4","gravatar_id":"","url":"https://api.github.com/users/a-palyanov","html_url":"https://github.com/a-palyanov","followers_url":"https://api.github.com/users/a-palyanov/followers","following_url":"https://api.github.com/users/a-palyanov/following{/other_user}","gists_url":"https://api.github.com/users/a-palyanov/gists{/gist_id}","starred_url":"https://api.github.com/users/a-palyanov/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/a-palyanov/subscriptions","organizations_url":"https://api.github.com/users/a-palyanov/orgs","repos_url":"https://api.github.com/users/a-palyanov/repos","events_url":"https://api.github.com/users/a-palyanov/events{/privacy}","received_events_url":"https://api.github.com/users/a-palyanov/received_events","type":"User","site_admin":false}],"milestone":null,"comments":3,"created_at":"2017-10-19T13:40:01Z","updated_at":"2017-12-13T07:10:18Z","closed_at":null,"author_association":"OWNER","body":"One statement about worm body is the following: \r\n\"The stiffness of the body is due to both high elastic modulus of its cuticle (the Young Modulus, E = 10–400 MPa, is comparable to rubber). Using measured viscoelasticity, it is possible to estimate the muscle power that is required to bend the body itself or to push the body against surroundings. In environments that pose little resistance (e.g., water), most muscle power is used to drive the bending of a stiff body. Only when the viscosity of surroundings increases by ~100-fold does the muscle power needed to push against the environment begin to compare with the power needed to bend the body. For over a ~10,000-fold increase in environmental viscosity, the muscle power varies by less than twofold [72]. Hence, the C. elegans motor circuit operates in low gear, pushing the animal through high resistance environments, and exhibiting little acceleration in low resistance environments.\" \r\n(source: https://scholar.harvard.edu/files/aravisamuel/files/zhen_curr_opin_neurobiol_2015.pdf)\r\n\r\nAnother one contains significanlty different values: \r\n\"Despite the high stiffness measurements reported for the worm cuticle, an analysis based on the bending moments observed in the worm’s undulatory swimming gait leads to a significantly lower estimate for the Young’s modulus for the entire worm, 3.77 kPa (14); the mechanical loading in this experiment was provided by the worm’s own muscles as it swims, complicating interpretation and possibly underlying the low modulus value. Another recent study measured the worm’s bending modulus using deflection of the entire body under actuation from a single point (26). Calculating the Young’s modulus of the worm’s body yields a value ranging from 110 kPa to 1.3 MPa, depending on whether the worm is modeled as a uniform cylinder or cylindrical shell (26). The large range of reported values highlights our **poor understanding of the mechanical properties of C. elegans**. There is a clear need for elucidating the role of the cuticle, as well as the interplay of internal and external pressure, in the mechanics of the whole worm.\"\r\n(source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4407266/)\r\n\r\nHere I plan to discuss parameters, values and other stuff related to worm body modelling, and keep the history of progress on this, especially related to Sibernetic worm models. "},"comment":{"url":"https://api.github.com/repos/openworm/sibernetic/issues/comments/351303315","html_url":"https://github.com/openworm/sibernetic/issues/127#issuecomment-351303315","issue_url":"https://api.github.com/repos/openworm/sibernetic/issues/127","id":351303315,"user":{"login":"a-palyanov","id":1803774,"avatar_url":"https://avatars2.githubusercontent.com/u/1803774?v=4","gravatar_id":"","url":"https://api.github.com/users/a-palyanov","html_url":"https://github.com/a-palyanov","followers_url":"https://api.github.com/users/a-palyanov/followers","following_url":"https://api.github.com/users/a-palyanov/following{/other_user}","gists_url":"https://api.github.com/users/a-palyanov/gists{/gist_id}","starred_url":"https://api.github.com/users/a-palyanov/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/a-palyanov/subscriptions","organizations_url":"https://api.github.com/users/a-palyanov/orgs","repos_url":"https://api.github.com/users/a-palyanov/repos","events_url":"https://api.github.com/users/a-palyanov/events{/privacy}","received_events_url":"https://api.github.com/users/a-palyanov/received_events","type":"User","site_admin":false},"created_at":"2017-12-13T07:10:18Z","updated_at":"2017-12-13T07:10:18Z","author_association":"OWNER","body":"I've decided to investigate the dependence of simulation quality on integration time step and used the [swimming scene](https://www.youtube.com/watch?v=IUMI7XQpNBk) for this. Here are the initial and final positions of the worm:\r\n![swimming_start_end](https://user-images.githubusercontent.com/1803774/33926021-209f34d8-e00f-11e7-9246-948b604d1585.png)\r\n"}}
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