| cyclosporins | <chemical> A group of closely related cyclic undecapeptides from the fungi trichoderma polysporum and cylindocarpon lucidum. They have some antineoplastic and antifungal action and significant immunosuppressive effects. Cyclosporins have been proposed as adjuvants in tissue and organ transplantation to suppress graft rejection. Pharmacological action: enzyme inhibitors, immunosuppressive agents. (12 Dec 1998) |
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| cyclosteroids | Steroid derivatives in which one or more bridges is formed between carbon atoms at any locant in any of the rings. (12 Dec 1998) |
| cyclothiazide | 6-Chloro-3,4-dihydro-3-(2-norbornen-5-yl)-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide;a diuretic and antihypertensive. (05 Mar 2000) |
| cyclothymia | A mental disorder characterised by marked swings of mood from depression to hypomania but not to the degree that occurs in bipolar disorder. Origin: cyclo-+ G. Thymos, rage (05 Mar 2000) |
| cyclothymiac | Cyclothymic Relating to cyclothymia. (05 Mar 2000) |
| cyclothymic disorder | An affective disorder characterised by periods of depression and hypomania. These may be separated by periods of normal mood. (12 Dec 1998) |
| cyclothymic personality | A personality disorder in which a person experiences regularly alternating periods of elation and depression, (see bipolar illness) usually not related to external circumstances or situation. (27 Sep 1997) |
| cyclothymic personality disorder | A personality disorder in which a person experiences regularly alternating periods of elation and depression, (see bipolar illness) usually not related to external circumstances or situation. (27 Sep 1997) |
| cyclotomy | Operation of cutting the ciliary muscle. Origin: cyclo-+ G. Tome, incision (05 Mar 2000) |
| cyclotorsion | Rotation of the eye around its visual axis. Synonym: circumduction, cyclotorsion. Origin: cyclo-+ L. Duco, pp. Ductus, to draw (05 Mar 2000) |
| cyclotron | <radiobiology> Particle accelerator in which a magnetic field causes particles to orbit in circles, and an oscillating electric field accelerates the particles. (09 Oct 1997) |
| cyclotron frequency | <radiobiology> Number of times per second that a particle orbits a magnetic field line. The frequency is completely determined by the strength of the field and the particle's charge-to-mass ratio. (Often, and incorrectly, called the Larmor frequency. The cyclotron or gyrofrequency is twice the Larmor frequency of precession.) (09 Oct 1997) |
| cyclotron radius | <radiobiology> Radius of orbit of charged particle about a magnetic field line. Synonym: gyroradius, Larmor radius. (09 Oct 1997) |
| cyclotron resonance | <radiobiology> Charged particles in a magnetic field resonate with (and absorb energy from) an electric field (perpendicular to the magnetic field) which oscillates at the particles' cyclotron frequency, or at a harmonic (multiple) of that frequency. (09 Oct 1997) |
| cyclotrons | Devices for accelerating charged particles in a spiral path by a constant-frequency alternating electric field. This electric field is synchronised with the movement of the particles in a constant magnetic field. (12 Dec 1998) |