Four-dimensional color ultrasound captures the moment of fetal warmth
Release date: 2014-11-21 Manchester's John and Charlotte Steel saw their unborn son turn his head in the mother's womb and smile with a happy smile through the four-dimensional color ultrasound. Four-dimensional color ultrasound is to produce clear three-dimensional images from captured images from different angles, and then continuously record three-dimensional image recording video is four-dimensional color ultrasound. Four-dimensional color ultrasound is an advanced form developed from traditional ultrasound. Traditional ultrasound uses a probe to emit ultrasound, which is placed on the abdomen of the pregnant woman, and the probe can be scanned to scan the uterine region. When the ultrasound encounters the fetus, it will rebound and display the "image" of the fetus to the screen. The ultrasonic frequency used by the four-dimensional color ultrasound is the same as that of the ordinary color ultrasound. But ultrasound is emitted from multiple angles and produces a real-time image of fetal motion, a four-dimensional image that scientists call. Original link: http:// Source: Kexun Medical Network
PCR ( Polymerase Chain Reaction)
SARS-Cov-2, One test type that uses a sample from a nose or throat swab in a 'PCR test'. The goal is to make enough copies of the viral cDNA in order for it to be detectable.
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When they saw the child’s 31-week scan, the child’s video shocked them. These images were captured by four-dimensional color ultrasound. At present, four-dimensional color ultrasound is becoming more and more popular, and people want to see their children in advance. 
It provides a way to make more copies of a portion of DNA.
We need to have PCR ingredients that include DNA portion, Buffer solution, Primer+DNA (tap polymerase), and Nucleotides during the preparation step.
In the step of PCR sequence, there are three steps in this section.
Step 1 Denaturation
The addition of heat is needed to separate the two strands of the DNA molecule.
Step 2 Annealing
Temperature, is going to be cool in this step, should allow the primers to bind to the specific segments.
Step 3 DNA Synthesis
To make more copies of the DNA.
Those three steps above keep repeating to make enough copies of the DNA fragments. It is the principle of how PCR machine works.