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Biomedical subjects

S Nityanand

Publications and source records attributed to S Nityanand.

At least 55 records · Page 3Linked to original sources
PubMed1982

Conformational transitions in serum high density apoproteins of hypercholesterolemic monkeys.

Conformational transitions in serum high density apolipoproteins of normal and hypercholesterolemic monkeys have been studied by circular dichroism. This study has revealed that under hypercholesterolemic conditions the secondary structure of apolipoproteins suffers permanent changes which could be observed even after a lengthy procedure of isolation, purification and delipidation of high density lipoprotein.

Amino Acid Sequence↗
PubMed1981

Pharmacological studies on coleonol, a hypotensive diterpene from Coleus forskohlii.

Coleus spp. have been used in Aurvedic medicine for heart diseases, spasmodic pain, painful micturition and convulsions. The pharmacological properties of coleonol, a diterpene, isolated from Coleus forskohlii were investigated. Its predominant effect is to lower the blood pressure of anaesthetised cat and rat as well as of the spontaneously hypertensive rat due to relaxation of the vascular smooth muscle. In small doses it has a positive inotropic effect on isolated rabbit heart as well as on cat heart in vivo. Coleonol also exhibits nonspecific spasmolytic activity on smooth muscle of the gastrointestinal tract in various species but not on bronchial musculature of guinea pig. Large doses of coleonol have a depressant action on the central nervous system. These results provide the rationale for the use of this plant in Aurvedic medicine.

Animals↗
PubMed1978

Pharmacological studies on 3-[gamma-(p-fluorobenzoyl)propyl]-2,3,4,4a,5,6-hexahydro-1-(H)-pyrazino (1,2-a) quinoline (compound 69/183). Part I: Hypotensive activity.

3-[gamma-(p-Fluorobenzoyl)propyl]-2,3,4,4a,5,6-hexahydro-1-(H)-pyrazinol(1,2-a)quinoline (compound 69/183, centpyraquin) has been found to possess promising hypotensive activity in anaesthetised cat, dog and monkey- It also lowers the blood pressure of unanaesthetised cat, dog and hypertensive rat. The effective doses are between 0.5 to 2.0 mg/kg in all the species except rat, in which doses of 10.0 and 20.0 mg/kg are effective. The compound potentiates epinephrine and norepinephrine pressor responses but inhibits carotid occlusion, tyramine and DMPP induced pressor responses. The contraction of the nictitating membrane due to pre- as well as post-ganglionic sympathetic nerve stimulation is blocked equally. In mice the compound produces ptosis which is antagonised by N-benzyl-N-methylguanidine. Localisation of the compound either to the superior cervical ganglion of cat or to the central cardiovascular loci has no effect on the activities of either of them. No evidence of an initial catecholamine release by the compound could be obtained. It has weak smooth muscle relaxant activity. The mechanism of hypotensive action seems to be the blockade of adrenergic neurones along with direct smooth muscle relaxation.

Adrenal Glands↗