Signs and symptoms
Lumbar hyperlordosis (also known as anterior pelvic tilt) has a noticeable impact on the height of individuals with this medical issue, a height loss of 0.5–2.5 inches (1.27–6.35 centimeters) is common.For example, the height loss was measured by measuring the patients height while he or she is standing straight (with exaggerated curves in the upper and lower back) and again after he or she fixed this issue (with no exaggerated curves), both of these measurements were taken in the morning with a gap of 6 months and the growth plates of the patient were checked to make sure that they were closed to rule out natural growth. The height loss occurs in the torso region and once the person fixes his or her back, the persons Body Mass Index will reduce since he or she is taller and the stomach will also appear to be slimmer.A similar impact has also been noticed in transfeminine people who have weaker muscles in the lower back due to increased estrogen intake and other such treatments.However, the cause of height loss in both situations is a little different even though the impact is similar.
Alloys of 85–88% zinc, 4–10% copper, and 2–8% aluminium find limited use in certain types of machine bearings. Zinc has been the primary metal in American one cent coins (pennies) since 1982. The zinc core is coated with a thin layer of copper to give the appearance of a copper coin. In 1994, 33,200 tonnes (36,600 short tons) of zinc were used to produce 13.6 billion pennies in the United States.Alloys of zinc with small amounts of copper, aluminium, and magnesium are useful in die casting as well as spin casting, especially in the automotive, electrical, and hardware industries. These alloys are marketed under the name Zamak. An example of this is zinc aluminium. The low melting point together with the low viscosity of the alloy makes possible the production of small and intricate shapes. The low working temperature leads to rapid cooling of the cast products and fast production for assembly. Another alloy, marketed under the brand name Prestal, contains 78% zinc and 22% aluminium, and is reported to be nearly as strong as steel but as malleable as plastic. This superplasticity of the alloy allows it to be molded using die casts made of ceramics and cement.Similar alloys with the addition of a small amount of lead can be cold-rolled into sheets. An alloy of 96% zinc and 4% aluminium is used to make stamping dies for low production run applications for which ferrous metal dies would be too expensive.