A superhelix is a molecular structure in which a helix is itself coiled into a helix. This is significant to both proteins and genetic material, such as overwound circular DNA. The earliest significant reference in molecular biology is from 1971, by F. B. Fuller: A geometric invariant of a space curve, the writhing number, is defined and studied. For the central curve of a twisted cord the writhing number measures the extent to which coiling of the central curve has relieved local twisting of the cord. This study originated in response to questions that arise in the study of supercoiled double-stranded DNA rings. About the writhing number, mathematician W. F. Pohl says: It is well known that the writhing number is a standard measure of the global geometry of a closed space curve. Contrary to intuition, a topological property, the linking number, arises from the geometric properties twist and writhe according to the following relationship: Lk= T + W, where Lk is the linking number, W is the writhe and T is the twist of the coil. The linking number refers to the number of times that one strand wraps around the other. In DNA this property does not change and can only be modified by specialized enzymes called topoisomerases. (Wikipedia).
Build Your Own Supercomputer 1 - About Supercomputers
Supercomputer Playlist: http://www.youtube.com/watch?v=13x90STvKnQ&list=PLQVvvaa0QuDf9IW-fe6No8SCw-aVnCfRi&feature=share Greetings and welcome to my "how to build your own supercomputer" tutorial series. In this video, the concept of supercomputers is introduced, their history, and the ba
From playlist Build your Own Supercomputer
Build Your Own Supercomputer 5 - Testing supercomputer process
Supercomputer Playlist: http://www.youtube.com/watch?v=13x90STvKnQ&list=PLQVvvaa0QuDf9IW-fe6No8SCw-aVnCfRi&feature=share In this part of how to build a supercomputer, we test the MPI and supercomputing technology on a single node. http://seaofbtc.com http://sentdex.com http://hkinsley.co
From playlist Build your Own Supercomputer
Build Your Own Supercomputer 6 - Copying Master Node
Supercomputer Playlist: http://www.youtube.com/watch?v=13x90STvKnQ&list=PLQVvvaa0QuDf9IW-fe6No8SCw-aVnCfRi&feature=share In part 6 of the how to build a supercomputer series, we copy the master node to create our worker node, bypassing needing to do everything over again. http://seaofbtc
From playlist Build your Own Supercomputer
AWESOME SUPERCONDUCTOR LEVITATION!!!
A quantum levitator it's a circular track of magnets above which a razor-thin disc magically levitates, seeming to defy the laws of physics. The key to the levitator is the disc, which is made of superconducting material sandwiched between layers of gold and sapphire crystal. A piece of fo
From playlist THERMODYNAMICS
If you rotate a bowling ball, it looks the same even though it's been "transformed". We say that the bowling ball exhibits "rotational symmetry". The particles making up the universe exhibit related kinds of symmetries, in which the particles are transformed but the equations describing th
From playlist Science Unplugged: Supersymmetry
AWESOME antigravity electromagnetic levitator (explaining simply)
Physics levitron (science experiments)
From playlist ELECTROMAGNETISM
Go to https://expressvpn.com/nilered and find out how you can get 3 months free. ------------------------------------------- A few years ago, I saw a video about superconductors and it looked like anti-gravity magic. So, I decided to try and make some superconductors myself and to see if
From playlist Long Projects (25 min+)
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From playlist Science Unplugged: General Relativity
Watch more videos on http://www.brightstorm.com/math/geometry SUBSCRIBE FOR All OUR VIDEOS! https://www.youtube.com/subscription_center?add_user=brightstorm2 VISIT BRIGHTSTORM.com FOR TONS OF VIDEO TUTORIALS AND OTHER FEATURES! http://www.brightstorm.com/ LET'S CONNECT! Facebook ► https
From playlist Geometry