(Encyclopedia) transplantation, medical, surgical procedure by which a tissue or organ is removed and replaced by a corresponding part, usually from another part of the body or from another…
The different functions of a museumDinosaur displays in museums can take many forms. Original fossils are shown in glass cases, often presented in the rock in which they are embedded. Complete…
Born: 1926Birthplace: New York City Diagnostic x-ray systems—Ledley developed the ACTA diagnostic x-ray scanner, the first whole-body computerized tomography (CT) machine. He was the first to do…
(Encyclopedia) ash, in chemistry, solid residue of combustion. The chemical composition of an ash depends on that of the substance burned. Wood ash contains metal carbonates (e.g., potassium…
(Encyclopedia) sarcomasarcomasärkōˈmə [key], highly malignant tumor arising in connective- and muscle-cell tissue. It is the result of oncogenes (the cancer causing genes of some viruses) and proto-…
(Encyclopedia) scleroprotein, large class of protein molecules that are ordinarily insoluble in water. The scleroproteins are employed principally for architectural purposes in the living cell and…
(Encyclopedia) collagencollagenkŏlˈəjən [key], any of a group of proteins found in skin, ligaments, tendons, bone and cartilage, and other connective tissue. Cells called fibroblasts form the various…
(Encyclopedia) hemoglobinhemoglobinhēˈməglōˌbĭn [key], respiratory protein found in the red blood cells (erythrocytes) of all vertebrates and some invertebrates. A hemoglobin molecule is composed of…
(Encyclopedia) joint, in anatomy, juncture between two bones. Some joints are immovable, e.g., those that connect the bones of the skull, which are separated merely by short, tough fibers of…
(Encyclopedia) Larkin, Philip, 1922–85, English poet. He graduated from St. John's College, Oxford (B.A., 1943; M.A., 1947) and was for many years librarian at the Univ. of Hull. With an eye for the…
