Mindblown: a blog about philosophy.
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Clonal selection
The process by which T lymphocytes with receptors that react to self-antigens are destroyed in the thymus.
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Artificial selection
A process by which humans select desirable characteristics in animals and breed them for these phenotypes. Choosing plants or animals for breeding based on specific, desirable traits that can be inherited. For example, chickens might be selected to create a crossbreed that not only lays a large number of eggs but also produces quality meat.…
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Seldinger technique
A method of percutaneous introduction of a catheter into a vessel. The vessel is located and a needle is inserted. Once a good blood flow is obtained, a wire is threaded through the needle well into the vessel; the needle is then removed and the catheter threaded over the wire into the vessel. The wire…
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Segregator
An instrument composed of two ureteral catheters for securing urine from each kidney separately.
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Segmenter
A stage in the development of malarial parasites (genus Plasmodium) in which the organism undergoes schizogony,
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Segmental static reaction
A postural reflex in which the movement of one extremity results in a movement in an opposite extremity.
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Uterine segment
One of the two functional divisions of the uterine musculature during labor. During labor the upper uterine segment forcibly contracts, becoming progressively shorter and thicker, exerting traction on the more passive lower segment, and increasing the hydrostatic pressure against the cervix. The combination of forces and traction gradually cause the lower segment to thin, resulting…
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Bone seeker
An ion or compound that localizes preferentially in bone (e.g., strontium).
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Urinary sediments
Substances present in urine (i.e., bacteria, mucus, phosphates, uric acid, calcium oxalate, calcium carbonate, calcium phosphate, magnesium and ammonium phosphate; and more rarely, cystine, tyrosine, xanthine, hippuric acid, hematoidin) that separate and accumulate at the bottom of a container of urine. This process may be accelerated by centrifuging the urine specimen.
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Sedation vacation
A colloquial term for an interruption of the infusion of sedatives in a mechanically ventilated patient. Decreasing the depth of a critically ill patient’s sedation facilitates weaning from mechanical ventilation.
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