| microdactylia | Smallness or shortness of the fingers or toes. Synonym: microdactylia. Origin: micro-+ G. Dactylos, finger, toe (05 Mar 2000) |
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| microdactylous | Relating to or characterised by microdactyly. (05 Mar 2000) |
| microdactyly | Smallness or shortness of the fingers or toes. Synonym: microdactylia. Origin: micro-+ G. Dactylos, finger, toe (05 Mar 2000) |
| microdeletion | Loss of a piece from a chromosome that is too small to be seen through a microscope. Microdeletions require high-resolution chromosome banding, molecular chromosome analysis (with fish), or DNA analysis for detection. Disorders caused by microdeletions include angelman, digeorge, prader-willi, and williams syndromes. (12 Dec 1998) |
| microdialysis | Dialysis on a small scale, giving microlitre range samples. Used for example in studies of in vivo release of transmitters in brain tissue. (18 Nov 1997) |
| microdissection | Dissection of tissues under a microscope or magnifying glass, usually done by teasing the tissues apart by means of needles. (05 Mar 2000) |
| microdont | <anatomy> Having small teeth. Origin: Micr- + Gr, a tooth. Source: Websters Dictionary (01 Mar 1998) |
| microdontia | Microdontism A condition in which a single tooth, or pairs of teeth, or the whole dentition, may be disproportionately small. Origin: micro-+ G. Odous, tooth (05 Mar 2000) |
| microdose | A very small dose. (05 Mar 2000) |
| microdrepanocytic anaemia | Anaemia, clinically resembling sickle cell anaemia, in which individuals are compound heterozygous for the sickle cell gene and a thalassaemia gene; about 60 to 80% of haemoglobin is Hb S, up to 20% Hb F, and the remainder Hb anaemia. Synonym: sickle cell-thalassaemia disease. (05 Mar 2000) |
| microdrepanocytosis | A chronic haemolytic anaemia resulting from interaction of the genes for sickle cell anaemia and thalassaemia. Origin: microcytosis + drepanocytosis (05 Mar 2000) |
| microdysgenesia | Increase in partially distopic neurons in the stratum zonale, white matter, hippocampus and cerebellar cortex, producing an indistinct border between cortex and subcortical white matter and a columnar arrangement of cortical neurons; seen in patients with primary generalised epilepsy. Origin: micro-+ dys-+ G. Genesis, production (05 Mar 2000) |
| microelectric waves | That portion of the electromagnetic spectrum lying between uhf (ultrahigh frequency) radio waves and heat (infrared) waves. Microwaves are used to generate heat, especially in some types of diathermy. They may cause heat damage to tissues. (12 Dec 1998) |
| microelectrode | An electrode, with tip dimensions small enough (less than 1m) to allow nondestructive puncturing of the plasma membrane. This allows the intracellular recording of resting and action potentials, the measurement of intracellular ion and pH levels (using ion selective microelectrodes) or microinjection. Microelectrodes are generally pulled from glass capillaries and filled with conducting solutions of potassium chloride or potassium acetate to maximise conductivity near the tip. Electrical contact, if required, is usually made with a silver chloride coated silver wire. (18 Nov 1997) |
| microelectrodes | Electrodes with an extremely small tip, used in a voltage clamp or other apparatus to stimulate or record bioelectric potentials of single cells intracellularly or extracellularly. (12 Dec 1998) |