X-Ray_Diffraction_of_DNA.f4v

[@newtonsheikh]

22years since my school.. First time saw this experiment... I always wondered how this photo was taken and how it lead to the double helix.. I had asked my teacher a curious kid of 10th grade... Only today I got the answer.. Thanks

[@winproduction7585]

Eventhough this clip is like 10 years ago. But very understandable and have a good example. Thank you

[@brunothebrowndog]

This is such a valuable video. Thank you so much.

[@stellasolaria6224]

Rosalind Franklin really deserve noble prize since works like these and even small have got noble prize like stomach ulser cause finders and etc. I guess, it may be because she is a girl, and if she would have got one, it would have empowered girls.

[@stellasolaria6224]

@@qed100 really, that's new, could you please name a few women awarded with noble prize before Rosalin Franklin 😅 because the source (Ted ed) where I learned about Rosalin Franklin told me that at that time people used to discourage girls from studying and conservative people commented on her (at that time) that a girl working means denial of a person (men)'s denial of job and suffering to a whole household 😅😒😔 please do tell me a few names of women before Rosalin Franklin before being awarded with noble prize, I would love to learn about them too

[@canavar7463]

@@qed100 Actually, Marie Curie has gotten Nobel prizes because of her husband’s character. They have tried to give her husband Pierre Curie a Nobel at first - for the work that actually made by Marie Curie - , but Pierre Curie indicated that he won’t accept the prize if the committee won’t give a prize for her wife too.

[@canavar7463]

@@qed100 And you can see that the first women who get a Nobel prize is Marie Curie, because of a noble-minded men such as Pierre Curie

[@canavar7463]

@@qed100 So Stella is actually right at the point that committee’s perspective on woman scientists back then but of course as you mentioned Rosalind Franklin’s reason for didn’t get a Nobel is different

[@jakelawliet3584]

um actually that is not the only reason she did not receive the prize.... she died of cancer due to playing with radioactivity and so only her boss Wilkins got the prize along with Watson and crick

[@pameslinkoln]

@donatsu8 - That is correct. The DNA must be very dehydrated. This was one of R. Franklin's talents, getting just the right amount of moisture to get the DNA to take on a crystal structure. Based on how dehydrated it was she was able to get two different DNA crystals (A form and B form - photo 51 is of B form). Also, it helps to take several photographs and wait for luck. There is a reason why its called photo 51; she took over a hundred!

[@adogandi]

Well done. Bravo!

[@donatsu8]

Hey DNA taken in a test tube will orient in all possible directions unlike your spring. How did she got such a distinct diffraction pattern from DNA molecules ?

[@mohamedbabiker6653]

Crystallization align the molecules in ordered pattern

[@wayneoutten8010]

@@mohamedbabiker6653 I think the images were actually of DNA fibers, not crystals. Basically very thin strings laid across a mount.

[@mohamedbabiker6653]

@@wayneoutten8010 Yes, but it has to crystallize first in order to be imaged by X-ray, the molecules assume ordered structure, regardless of the shape of the sample, it's like sugar cubes, sucrose molecules assume an ordered structure at the nanolevel, wether it's a long box or a circular in the gross level... That's my understanding of the process.

[@Monika_gora]

​@@mohamedbabiker6653how can we differentiate between Z- DNA and B- DNA like weather they are right handed or left handed on the basis of X-ray diffraction crystallography ?

[@flparg2]

Very simple and useful. Thank you.

[@jaydenarcher3674]

i know Im quite off topic but does anybody know of a good place to stream new tv shows online?

[@garyaxl5056]

@Jayden Archer Lately I have been using FlixZone. Just search on google for it :)

[@oossskim8237]

thank you!!!!!!!!!!!!!!!!!!! i finally understand the principle ...

[@lloydtripp3793]

Very nice. Great explanation.

[@ahmedalvie6617]

NiCe method of teaching 🥰🥰🥰😘💜sir

[@crickerloverwithlove]

She deserves a nobel prize but not completed her PhD for it😢

[@GH-oi2jf]

Franklin was not the first to determine that DNA was helical. She initially rejected Crick and Watson’s hypothesis that it was helical. According to Gosling, her student and assistant, she later concluded from her own data that the structure was helical, but by that time Watson and Crick had a complete model

[@Muonium1]

that doesn't fit the narrative of perpetually oppressed whaaamen under the thumb of the evil nasty patriarchy though, and so most people who know anything at all about DNA now simply believe "Franklin discovered the structure of DNA but was robbed of the Nobel Prize because spiteful insecure men hated her for having a vagina" or somesuch garbage. Common historical knowledge is littered with these kinds of politically driven conceits.

[@Vain-Voyager]

Franklin deserves a Nobel Physiology/Medicine Prize like Nicolas Tesla deserves what Thomas Edison took from him.

[@donatsu8]

@pameslinkoln Thank you. Makes sense. Are diffraction studies done when molecule is in form of crystal?

[@pameslinkoln]

@donatsu8 Getting a crystal structure is important for measuring objects that have repeating structures like DNA or proteins; generally it is necessarily. But if you watch our video on Diffraction you can see that almost any object can cause diffraction!

[@pameslinkoln]

No, its the opposite. Gamma Rays will have more penetrating power. Gamma rays should get through bone and require lots of material to obstruct or diffract them. In the video I don't have time to explain it but the more electrons a nucleus has around it, the more it blocks/diffracts x-rays. It's not the nuclei themselves that are blocking the x-rays.

[@alsultanyazen3210]

اصدقاء دكتور ثامر 🌚😂🤝

[@nirajkolhe163]

Hi