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M W PARKES

Publications and source records attributed to M W PARKES.

8 recordsLinked to original sources
PubMed1961

Tranquillizers.

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Tranquilizing Agents↗
PubMed1959

The effects of reserpine and other agents upon leptazol convulsions in mice.

Reserpine and tetrabenazine reduced the survival time of mice infused with leptazol. This effect was antagonized by pretreatment with iproniazid. The survival time of iproniazid-treated mice was prolonged by 5-hydroxytryptophan but not by 3:4-dihydroxyphenylalanine. These findings suggest a relation between leptazol sensitivity and brain levels of 5-hydroxytryptamine.

5-Hydroxytryptophan↗
PubMed1957

Oxytocic activity of basic (aminomethyl) derivatives of phenols and related compounds.

A series of piperidinomethyl and related derivatives of naphthols, substituted phenols and indoles has been tested for oxytocic activity, using in vitro and in vivo methods of assay. Some of the compounds possessed very high activity, exceeding that of ergometrine. Activity was not associated with any structural resemblance to the ergot alkaloids.Highest activity occurred with 2-piperidinomethyl derivatives of phenols, among which maximum potency was conferred by substitution, at both the 4- and 5- positions, by methyl or ethyl or by linkage of these positions to form an indane derivative. In all series, piperidinomethyl derivatives were more active than those formed with other bases and methylation in the position alpha- to the nitrogen atom augmented the activity of both piperidine and morpholine derivatives. Among 2'-methyl piperidinomethyl phenols, the (-) form was more active than the (+). Acylation or alkylation of the phenolic hydroxyl group did not affect activity.The oxytocic activity was specific, the compounds being less effective upon other forms of smooth muscle. Effects upon blood pressure and respiration of a central nature were observed.

Blood Pressure↗
PubMed1957

The relation between sedation and body temperature in the mouse.

Chlorpromazine and reserpine reduce locomotor activity and prolong pentobarbitone hypnosis in mice. Both these effects are shown to be proportional to the fall in body temperature produced by these drugs. Other agents are shown to reduce body temperature and potentiate pentobarbitone. At ambient temperatures of 32 degrees C. neither chlorpromazine nor reserpine is hypothermic or sedative. It is concluded that sedative effects in the mouse at ordinary room temperatures are related to the hypothermic properties of these drugs. At 36 degrees C., while reserpine fails to potentiate pentobarbitone, chlorpromazine still does so.

Anesthesia↗