The p24 antigen test can detect the p24 protein on average 10 to 14 days after infection with HIV.2,3,11,12 One drawback of this test is that levels of the p24 protein peak at around three to four weeks after exposure to HIV and are usually not detectable after five to six weeks (and sometimes even earlier).
Liquid nitrogen is nitrogen in a liquid state at an extremely low temperature.It is produced industrially by fractional distillation of liquid air. Liquid nitrogen is a colorless clear liquid with density of 0.807 g/ml at its boiling point and a dielectric constant of 1.43.iquid nitrogen is nitrogen in a liquid state at an extremely low temperature.
It will sublimate at a rate of 5to10 pounds in24 hrs ice chest. When dry ice is added into a liquid nitrogen,dry ice turns more solid and colour changes. Like co2 nitrogen has same standard pressures and temperatures.Like nitrogen,co2 must change its state to get cooled. It reacts rapidly by explodind with white fume.