Erectile Dysfunction Causes and Symptoms. There are many causes of erectile dysfunction (impotence) and some include: 1  blood vessel diseases (such as peripheral vascular disease and others), 2  systemic disease, 3  hormonal imbalance, and. 4  medications (such as blood pressure and heart medications).
For the martial arts rank of Nidan, see Dan (rank). Nidan (sometimes known as Midan or Idan) was a Welsh priest and, according to some sources, a bishop, in the 6th and 7th centuries. He is now commemorated as a saint.
Definition of nidus. plural. nidi. play \ËnÄ«-ËdÄ«\ or. niduses. 1 : a nest or breeding place; especially : a place or substance in an animal or plant where bacteria or other organisms lodge and multiply. 2 : a place where something originates, develops, or is located. a type of contact lens that proved to be a nidus of infection.