Hirudin Hirudin Hirudin is a naturally occurring peptide in the salivary glands of blood-sucking leeches (such as "Hirudo medicinalis") that has a blood anticoagulant property. This is fundamental for the leeches’ alimentary habit of hematophagy, since it keeps the blood flowing after the initial phlebotomy performed by the worm on the host’s skin. During his years in Birmingham and Edinburgh, John Berry Haycraft had been actively engaged in research and published papers on the coagulation of blood, and in 1884, he discovered that the leech secreted a powerful anticoagulant, which he named hirudin, although it was not isolated until the 1950s,
Naturally occurring retirement community South Houses, a ten-building 2,800-unit moderate-income housing cooperative located in New York City, with support from the UJA/Federation of New York. Since then, the NORC program model has been broadly replicated at the local, state, and national levels and can be found in more than 25 states across the country. Naturally occurring retirement community A naturally occurring retirement community (NORC; ) is a term used to describe a community that has a large proportion of residents over 60 but was not specifically planned or designed to meet the needs of seniors living independently in their homes. NORCs may develop in