Search

Your search keyword '"Srinivasan, Geetha"' showing total 2 results
Start Over Author "Srinivasan, Geetha" Language undetermined
2 results on '"Srinivasan, Geetha"'

1. Oscillation of third-order delay difference equations with negative damping term

Author

Martin Bohner, Srinivasan Selvarangam, Ethiraju Thandapani, and Srinivasan Geetha

Subjects
Third order, Differential equation, Oscillation, Mathematical analysis, General Earth and Planetary Sciences, General Environmental Science, Term (time), Mathematics
Abstract

The aim of this paper is to investigate the oscillatory and asymptotic behavior of solutions of a third-order delay difference equation. By using comparison theorems, we deduce oscillation of the difference equation from its relation to certain associated first-order delay difference equations or inequalities. Examples are given to illustrate the main results.

Published
2018

2. Carbachol-induced sensitivity changes in skeletal muscle and their mechanism of action

Author

Subramania Ramaswamy, V. Srinivasan Geetha, Lalitha Kameswaran, and S. Kwaja Nazimudeen

Subjects
medicine.medical_specialty, Physostigmine, Carbachol, Potassium, chemistry.chemical_element, Hexamethonium Compounds, In Vitro Techniques, Potassium Chloride, chemistry.chemical_compound, Internal medicine, medicine, Animals, Pharmacology, Muscles, Skeletal muscle, In vitro, Acetylcholine, medicine.anatomical_structure, Endocrinology, chemistry, Mechanism of action, Hexamethonium, Calcium, medicine.symptom, Anura, medicine.drug, Muscle Contraction
Abstract

Pretreatment of carbachol (in vitro), in various doses (5.5 pM to 550 nM), produced a significant decrease in the sensitivity of the frog rectus abdominis muscle to acetylcholine (ACh), in a dose-dependent manner. This action was observed with a 60 min incubation period. Contractions induced by potassium chloride (KCl) were unaffected by carbachol. Physostigmine (10 micrometer) potentiated the decrease in sensitivity induced by carbachol, whereas human plasma antagonised it. Low calcium (0.27 mM) in the medium and hexamethonium (300 micrometer) antagonised the sensitivity decrease induced by carbachol. These results suggest that carbachol decreases the sensitivity to ACh by releasing ACh from the presynaptic nerve terminals. The results further suggest that carbachol may release ACh by depolarising the presynaptic nicotinic receptors.

Published
1978

Catalog

Books, media, physical & digital resources
See catalog results