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.
The moon's motion through our sky is similar to that of the sun, but different: 1  Like the sun, the moon rises in the east and sets in the west (with some exceptions for observers in earth's extreme northern and southern regions). 2  Like the sun, the moon doesn't move across our sky quite as fast as the stars do. Third, when the moon is in its crescent phase and the sky is sufficiently dark, you can sometimes make out the rest of the moon's dimly lit disk. 2  This tells us that the moon isn't really changing shape; part of it is merely much brighter than the rest.