See Also: homogeneous immersion objective(medicine)
Homogeneous immersion(medicine)
immersion objective(medicine)
Herbal medicine (botanical medicine, herbology, phytomedicine)(health)
voltage(medicine)
voltage(dictionary)
voltage(dictionary)
voltage loop(medicine)
voltage gradient(medicine)
voltage clamp(medicine)

voltage clamp (medicine) and homogeneous immersion objective (medicine)


voltage clamp (medicine)


voltage clamp
<physiology, technique> A technique in electrophysiology, in which a microelectrode is inserted into a cell and current injected through the electrode so as to hold the cells membrane potential at some predefined level.

The technique can be used with separate electrodes for voltage sensing and current passing, for small cells, the same electrode can be used for both. Voltage clamp is a powerful technique for the study of ion channels.

See: patch clamp.


homogeneous immersion objective (medicine)


homogeneous immersion objective
<microscopy> An objective to be immersed in a liquid of a certain refractive index and dispersion value as specified by the manufacturer of the objective. An oil-immersion objective, the most important type, is intended to be immersed in cedarwood oil (nD = 1.515) or in its manmade optical equivalent. A water-immersion objective is for dipping into an aqueous specimen mount. Alpha-monobromonaphthalene has such a high refractive index (nD = 1.66) that a very highly resolving objective (1.60 numerical aperture) was designed to be immersed in that liquid, for use by reflected light on metals and Other opaque objects.