Possible mechanisms of sustained tremor induction by nicotine in pilocarpine treated animals

Alterations of steady state and metabolism of putative neurotransmitters were studied in the brain of rats with a sustained tremor evoked by nicotine and pilocarpine. The norepinephrine content in several brain regions was decreased whereas striatal dopamine was unchanged. Homovanillic acid concentrations were slightly increased, while 5-hydroxyindoleacetic acid concentrations were markedly increased. Pilocarpine alone increased the 5-hydroxytryptamine (5-HT) turnover rate at high ambient temperature (30-32 degrees C), but not at normal ambient temperature (22 +/- 2 degrees C), atropine partially blocked the increase of 5-HT turnover rate by pilocarpine. Pretreatment with p-chlorophenylalanine and hemicholinium-3 decreased the tremor intensity elicited by nicotine and pilocarpine . It is proposed that the increase of cholinergic function caused by nicotine and the activation of muscarinic receptors and the increase in 5-HT function caused by pilocarpine might be involved in the mechanisms of tremor induction by nicotine and pilocarpine.

New type interference selective modulation spectroscopy

A new method of interference spectroscopy is described. The spectral element is detected photoelectrically by taking the interference between the reflected and the diffracted beams by a modified Michelson interferometer without any computation. The spectrum is scanned by the rotation of the diffraction grating of the interferometer. Modulation of the spectral signal is carried out by the vibration of the reflecting mirror. The principle of the method and the first results are described. Source effects are also discussed.

Attainment of high resolution holographic fourier transform spectroscopy

Two methods are described to attain high resolution holographic spectroscopy. One is an interferometer construction to record the localized interference fringes on the photographic plate directly. The limitation due to the use of an imaging lens is removed. The other is the application of heterodyning techniques to holographic spectroscopy. By this method, a hologram with high resolving power is recorded on relatively low resolution photographic film.