DNA (deoxyribonucleic acid) supply | carbon nanotube nucleic acid loaded dna/rna material | dna/rna nucleic acid modified magnetic nanoparticles

DNA（ Deoxyribonucleic acid ） supply | Carbon nanotubes carry nucleic acids -DNA/RNA material |DNA/RNA Nucleic acid modified magnetic nanoparticles

DNA（ Deoxyribonucleic acid ） The type of

A-DNA： stay 75% Humidity , In the environment with high salt concentration or ion concentration , Such as K + 、Na + 、Cs + Or dehydrated , It still contains 11 Increase the form of nucleotides 2.56 A 0   Each base pair is vertical .  

B-DNA： It's in 9.25 Humidity and low salt concentration or ionic strength , Every lap has 10 Base pairs come from the helix .

C-DNA： stay 66% Humidity and lithium (Li +) It is observed in the occupation of some ions . It has about per revolution 9.33 Base pairs , The diameter of the spiral is about 19 A 0 The vertical height of each base pair in the right helix is 3.320.

D-DNA： Rarely considered an extreme variant , If about 8A, all 3.03 Base pairs are titrated negatively from the helix , Axial increase 0

Z-DNA： It exists in an environment with very high salt concentration , And A、B and C type DNA Different , It is a left-handed spiral structure .

 

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Small make up axc,2022.07.22