Best Answer: Heather gave you the correct answer. It stands for jumper due to the initials PJ on the old flight logs. However, today we only use the nickname PJ and the term Pararescuemen or Pararescueman to describe us.Pararescue Jumper is defunct. Yes, PJs actually jump. All PJs are basic airborne qualified and military free fall (HALO) qualified.he J stands for Jumper as in Air Force Pararescue Jumper. The term Pararescue Jumper is a retronym of the initials 'PJ' that were used on an Air Force Form 5 (Aircrew Flight Log) to identify anyone who is onboard in order to jump from the aircraft..
Definition of VIRION. : a complete virus particle that consists of an RNA or DNA core with a protein coat sometimes with external envelopes and that is the extracellular infective form of a virus.ADVERTISEMENT. French, from viri en viral (from virus virus) + -on 2 -on.First Known Use: 1959.edical Definition of VIRION. : a complete virus particle that consists of an RNA or DNA core with a protein coat sometimes with external envelopes and that is the extracellular infective form of a virus. Britannica.com: Encyclopedia article about virion.
A virus particle, also known as a virion, is essentially a nucleic acid (DNA or RNA) enclosed in a protein shell or coat. Viruses are extremely small, approximately 20 - 400 nanometers in diameter. The largest virus, known as the Mimivirus, can measure up to 500 nanometers in diameter.By comparison, a human red blood cell is around 6,000 to 8,000 nanometers in diameter. In addition to varying sizes, viruses also have a variety of shapes. Similar to bacteria, some viruses have spherical or rod shapes.iruses are not capable of replicating their genes by themselves. They must rely on a host cell for reproduction. In order for viral replication to occur, the virus must first infect a host cell. The virus injects its genetic material into the cell and uses the cell's organelles to replicate.