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stem
stem
stem In a
vascular plant, the part of the plant that bears
buds, leaves, and flowers. It forms the central
axis of the plant and often provides mechanical support. Most commonly it is above ground, but it may lie below ground, and is then termed a
rhizome.
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stem cells
Book article from: The Columbia Encyclopedia, Sixth Edition
stem cells unspecialized human or animal cells...same time replicate themselves. Embryonic stem cells are derived from a blastocyst (the...cells and is shaped like a hollow sphere. The stem cells themselves are the cells in the blastocyst...
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Stem Cell Transplantation
Encyclopedia entry from: Gale Encyclopedia of Medicine, 3rd ed.
Stem Cell Transplantation Definition Stem cells are basic human cells that reproduce (replicate) easily...continuous source of new, sometimes different types of cells. A stem cell transplant is a procedure that replaces unhealthy stem cells...
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Stem Cell Research
Encyclopedia entry from: Encyclopedia of Science and Religion
Stem Cell Research Few topics in science and religion...been as hotly contested in recent years as stem cell research, largely because it involves...human embryo. There are two basic types of stem cell research — that involving adult...
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Stem Cells
Encyclopedia entry from: International Encyclopedia of the Social Sciences
Stem Cells A stem cell has two special qualities: the ability to produce offspring of itself...into different types of specialized cells. “ Adult ” stem cells are found in various organs of fully formed organisms. For example...
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stem
Book article from: The Columbia Encyclopedia, Sixth Edition
stem supporting structure...food materials. The stems of herbaceous and of...growing conditions. Aerial stems may be specialized as...moisture-retaining stem of many arid-land plants...succulents). Aerial stems are usually erect; however...
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