The BUN is roughly one-half of the blood urea (R). Normal human adult blood should contain between 5 to 20 mg of urea nitrogen per 100 ml (5â20 mg/dL) of blood, or 1.8 to 7.1 mmol urea per liter (R). To convert from mg/dL of blood urea nitrogen to mmol/L of urea, multiply by 0.357.
The 'dark' side of the moon. The moon orbits the Earth once every 27.322 days. It also takes approximately 27 days for the moon to rotate once on its axis. As a result, the moon does not seem to be spinning but appears to observers from Earth to be keeping almost perfectly still. Scientists call this sychronous rotation. The side of the moon that perpetually faces Earth is known as the near side. The opposite or back side is the far side.
But wait a second and think. The Moon follows the Earth around the Sun in its orbit, and if you didnât have the Earth, the Moon would really be orbiting the Sun. So can we say that the Moon is really orbiting the Sun? No. But the case is pretty compelling. First, take a look at the orbital velocity of the Moon. The Moonâs velocity around the Moon is a mere 1 km/second. But the Moonâs velocity around the Sun is 30 km/sec; same as the Earth. And hereâs something stranger. the Moon doesnât follow a spiral pattern around the Sun, as you would think, but it always follows a convex path compared to the Sun.