vallia
Forum Guru
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positively supercoiled DNA... thanks
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| Musuq
Forum Guru
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Imagine a phone's chord overtwisted, that's a supercoiling
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| plastic_girl
Forum Elite
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Nice diagrams, where do you get them from Musuq?
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| Musuq
Forum Guru
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anywhere, yahoo images, google images, I started collecting them when I went over concepts i just could not picture myself.
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| plastic_girl
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Ok, cool, thanks!! 
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It aint over till its over, and its only over when you say its over.......and I will NEVER say its over!!
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| vallia
Forum Guru
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thanks musuq, yes I imagine it looked that way. I didn't know the difference between negative and positive supercoil, but I got it. Thanks a lot.
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| study_ing
Forum Fanatic
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Vow Musuq..
just one little detail..what duz Lk int he last pic indicate?
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| Musuq
Forum Guru
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Lk = linking number = Tw + Wr
Tw = twist = number of turns of the double helix
Wr = writhe = number of superhelical turns; Wr is positive for positive supercoiling and negative for negative supercoiling
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| HILFIGER
Forum Senior
Topics: 21
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As far as I understood If you wind clockwise it's positive, and counterclockwise negative supercoil. Otherwise the above supercoils look the same. Am I right?
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| proctalgia
Forum Senior
Topics: 2
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If you look at the two twisted coils , they are not the same. The negative coil on the left is twisted counterclockwise and the one on the right is clockwise.
By twisting the right coil clockwise you can add more loops to the coil. but if you do clockwise twisting to left one you will actually unwind it.
you are correct HILFGER.
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| HILFIGER
Forum Senior
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Posts: 192
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Thanks
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