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.
If you check on almost any Periodic Table, you will find the boiling point of N (actually N2 since the normal state of nitrogen is the molecule N2) is -195.8 C (77 K or 77 degrees above absolute zero).We have not observed solid N2 so there is no melting point listed.f you check on almost any Periodic Table, you will find the boiling point of N (actually N2 since the normal state of nitrogen is the molecule N2) is -195.8 C (77 K or 77 degrees above absolute zero). We have not observed solid N2 so there is no melting point listed.