See Also: Herbal medicine (botanical medicine, herbology, phytomedicine)(health)
Medicine Lodge Memorial Hospital- Medicine Lodge(health)
ARREST(law)
arrest(encyclopedia)
arrest(2)(dictionary)
Arrest:(law)
Arrest (UCR)(law)
arrest(1)(dictionary)
Arrest(medicine)
circulatory arrest(medicine)

density gradient (medicine) and arrest (sh)


density gradient (medicine)


density gradient
<chemistry> A column of liquid in which the density varies continually with position, usually as a consequence of variation of concentration of a solute.

Such gradients may be established by progressive mixing of solutions of different density as for example: sucrose gradients) or by centrifuge induced redistribution of solute (as for caesium chloride gradients).

Density gradients are widely used for centrifugal and gravity induced separations of cells, organelles and macromolecules. The separations may exploit density differences between particles or primarily differences in size, in which latter case the function of the gradient is chiefly to stabilise the liquid column against mixing.


arrest (sh)




Restraint and seizure of a person by someone (e.g., a police officer) acting under legal authority.

An officer may arrest a person who is committing or attempting to commit a crime in the officer's presence. Arrest is also permitted if the officer reasonably believes that a crime has been committed and that the person arrested is the guilty party. A court or judicial officer may issue an arrest warrant on a showing of probable cause. Most states restrict or prohibit arrest in civil (noncriminal) cases; an example of occasionally permitted civil arrest is the taking into custody of a debtor who might otherwise abscond. In the U.S., suspects must be warned of their rights when they are arrested (see Miranda v. Arizona). An unlawful arrest is regarded as false imprisonment and usually invalidates any evidence collected in connection with it. See also rights of the accused; grand jury; indictment.