A chemical formula that indicates the simplest numerical ratio of the elements within a molecule, without demonstrating the molecule's chemical bonds or structure. For example, the empirical formula for water is H2O. Synonym: molecular formula.
Pelvic inflammatory disease (PID) is an infection caused by bacteria. When bacteria from the vagina or cervix travel to your womb, fallopian tubes, or ovaries they can cause an infection. Most of the time, PID is caused by bacteria from chlamydia and gonorrhea. These are sexually transmitted infections (STIs). Having unprotected sex with someone who has an STI can cause PID.
Complications. PID may result in adhesions or scarring of the fallopian tubes and pelvis, and is a common cause of pelvic pain and ectopic pregnancy. About a third of all women who are infertile have lost the ability to conceive because of PID.Occasionally, PID causes intraperitoneal abscesses.nfection of the uterus, fallopian tubes, and adjacent pelvic structures that is not associated with surgery or pregnancy. PID usually is caused by an ascending infection in which disease-producing germs spread from the vagina and cervix to the upper portions of the female reproductive tract. chlamydia; gonorrhea;