Related words. 1  high technology noun. 2  push technology noun. 3  technology therapy noun. 4  appropriate technology noun. 5  information technology noun. 6  intermediate technology noun. 7  clean technology noun at cleantech.8  blind someone with science/technology phrase. 9  modern technology. 10  the frontiers of knowledge/science/technology.0% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars.
Two receptors, CD4 and a co-receptor act sequentially to trigger fusion of viral and cellular membranes and confer virus entry into cells. For HIV-1, the chemokine receptor CCR5 is the predominant co-receptor exploited for transmission and replication in vivo.
The viral envelope. HIV has a diameter of 1/10,000 of a millimeter and is spherical in shape. The outer coat of the virus, known as the viral envelope, is composed of two layers of fatty molecules called lipids, taken from the membrane of a human cell when a newly formed virus particle buds from the cell.