2007-02-05 19:22:36 · 4 answers · asked by King 2 in Science & Mathematics ➔ Physics
BCG can stand for many things :
Brightest cluster galaxies {BCGs) are the brightest and most massive galaxies in the universe, emitting purely photospheric light. They are generally elliptical galaxies which lie close to the host galaxy cluster kinematic centre, and except for those undergoing major mergers, they lie at the bottom of the cluster potential well and close to the X-ray peak emission.
Their small variance in luminosity, abundance and bright apparent magnitude make them excellent standard candles for distance determination.
Bacille Calmette-Guérin (BCG) is a vaccine against tuberculosis that is prepared from a strain of the attenuated (weakened) live bovine tuberculosis bacillus, Mycobacterium bovis, that has lost its virulence in humans by being specially cultured in an artificial medium for years. The bacilli have retained enough strong antigenicity to become a somewhat effective vaccine for the prevention of human tuberculosis. At best, the BCG vaccine is 80% effective in preventing tuberculosis for a duration of 15 years, however, its protective effect appears to vary according to geography.
Blue Compact Galaxy
A starburst galaxy is a galaxy in the process of an exceptionally high rate of star formation, compared to the usual star formation rate seen in most galaxies. Normal galaxies also form stars, but at a much lower rate. Galaxies are often observed to have a burst of star formation after a collision or close encounter between two galaxies.
The rate of star formation is so great for a galaxy undergoing a starburst that, if the rate was sustained, the gas reservoirs from which stars are formed would be used up on timescales much shorter than the dynamical lifetime of the galaxy. For this reason, it is presumed that starbursts are temporary.
2007-02-05 20:43:12 · answer #1 · answered by Charu Chandra Goel 5 · 1⤊ 0⤋
Bacille Calmette-Guérin (BCG) is a vaccine against tuberculosis
2007-02-06 01:56:49 · answer #2 · answered by Philomena 5 · 1⤊ 0⤋
This has nothing to do with Physics, I'm afraid. It has got more to do with Biology.
BCG stands for Bacillus Calmette Guerin. It is a vaccine used for curing tuberculosis (T.B.).
2007-02-05 20:24:56 · answer #3 · answered by Kristada 2 · 1⤊ 0⤋
This is not physics as far as I know..it's full form is Baccilus Calamett Guerine. It is a vaccination against TB.
2007-02-07 02:17:06 · answer #4 · answered by Anonymous · 1⤊ 0⤋