Many steels add to the iron-steel mix other metals that give the entire substance desirable properties such as strength, heat resistance, or flexibility. Steel is considered a mixture rather than a compound because the iron does not chemically bond with the carbon and other components.
Some of estrogen's effects include: 1  Increasing serotonin, and the number of serotonin receptors in the brain. 2  Modifying the production and the effects of endorphins, the feel-good chemicals in the brain. 3  Protecting nerves from damage, and possibly stimulating nerve growth.
One of the most significant questions raised by the new study is what, if any, effect the striking rise in estrogen has on a woman's risk of breast cancer. Studies show that estrogen therapy protects against heart disease and osteoporosis but may increase the risk of breast cancer. Some research also shows that moderate alcohol consumption -- one drink a day for a woman -- may decrease the risk of heart disease and increase the risk of breast cancer, as well.