ZnS DNA QDs near infrared zinc sulfide ZnS quantum dots modified deoxyribonucleic acid dna|dna modified ZnS quantum dots

ZnS-DNA QDs Near infrared zinc sulfide ZnS Quantum dot modified deoxyribonucleic acid DNA|DNA modification ZnS Quantum dots

NA In the molecular structure , Two polydeoxynucleotide chains are coiled around a common central axis , Form a double helix structure . Deoxyribose - The phosphate chain is outside the spiral structure , The base is facing inside . The two polydeoxynucleotide chains complement each other in reverse , Base pairs formed by hydrogen bonds between bases are connected , Form a fairly stable combination .

DNA The main categories of

1. Single chain DNA（single－stranded DNA） Most of the DNA Exist in a double helix structure , But after heat or alkali treatment, it will become a single chain state . Single chain DNA It refers to the existence in this state DNA. Single chain DNA In molecular hydrodynamics properties 、 Absorption spectrum 、 Base reaction properties and other aspects are similar to double chain DNA Different . Some phage particles contain single chain ring DNA, Such bacteriophages DNA When it proliferates in cells, it forms double chains DNA.

2. closed loop DNA（closed circular DNA） Double chain ring without fracture DNA, Also known as super helix DNA. Because the double chains with spiral structure are closed respectively , As a result, the whole DNA The molecule further spins to form a tertiary structure . In addition, if a fracture occurs on different parts of one or two chains , It will become an open loop without spiral DNA molecular . Plasmids or viruses extracted from cells DNA Both contain closed-loop and open-loop molecules . According to the different binding ability between the two and pigment , And separate the two .

3. The garbage DNA（Junk DNA） It refers to those that are not translated into proteins in the organism DNA, They used to be considered useless , So it is called garbage DNA .

 

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Small make up axc,2022.07.25