In modern medical analyzes, various types of organic dyes are used. However, as technology develops, the requirements for these pigments increase. Quantum dots, when they were discovered, immediately began to claim this role, as particles exceeding traditional solutions on many points. Due to the unique structure of the core and the shell, the quantum dots have a large quantum yield, a configurable size and a clear spectrum of luminescence. They are 20 times brighter and 100 times more stable than their predecessors.

Quantum dots can be used to identify cancer tumors. The so-called passive targeting involves introducing quantum dots into thepatient's body for the search and localization of the tumor. As you know, fast-growing cancer cells have better throughput than healthy cells, so quantum dots can penetrate in it. And because the tumor does not have a purification system, quantum dots can accumulate in it. This allows you to diagnose and see the location and size of the cancer tumor for further removal. This is a method of non-destructive anatomical control.

Previously, it was believed that quantum dots are harmful to the body, since their basis was cadmium, which is toxic. However, nowadays it has become possible to produce cadmium-free quantum dots based on, for example, silver or indium. These particles are not toxic and harmless to the body, in contrast to X-rays, MRI, Ultrasonography and other technologies.

Thus, thanks to the quantum dots, we can fully identify the configuration of the area of cancer cells and accurately cut out the segment of the infected site. Moreover, in QD biomedicine, in the future, it is possible to identify different types of viruses as simply as we could not have imagined to this day.

Quantum dots in this area can be used not only as an identifier for viruses and tumors, but also as a marker for studying new types of drugs. Here, too, there are certain difficulties. Those particles that are used for these purposes today cannot always withstand, for example, the acidic environment of the stomach, moreover, they may not be able to withstand repeated irradiation to find their location. Quantum dots, being harmless, can also survive in an active medium and shine as much as the experiment requires. We are able to track the behavior of the particles of the test drug - where they are moving through the body, how they are distributed, how long they are digested.



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