Slow Heart Beat (Bradycardia) An abnormally slow sinus heart rate is called the âsick sinus syndromeâ and, if severe, results in symptoms of fatigue. In some such cases a permanent pacemaker is needed to be implanted to generate a normal heart rate. Many people with sick sinus syndrome also develop atrial fibrillation.
Petrified wood (from the Greek root petro meaning rock or stone; literally wood turned into stone) is the name given to a special type of fossilized remains of terrestrial vegetation. It is the result of a tree or tree-like plants having completely transitioned to stone by the process of permineralization.lements such as manganese, iron, and copper in the water/mud during the petrification process give petrified wood a variety of color ranges. Pure quartz crystals are colorless, but when contaminants are added to the process the crystals take on a yellow, red, or other tint.
Whitewood is a term cabinetmakers use for a secondary, utility lumber, used for unseen things like toe kick framing, cleats, brackets, webbing, etc. There are a variety of species that get called whitewood, such as pine, poplar, spruce. Framing lumber should be stamped and you will see SPF on the stamp. This means the lumber is Spruce, Pine (southern yellow) or fir/hemlock all of which could be called whitewood. These days, I only see spruce in my area.