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1.
Global stability in time-delayed single-species dynamics 总被引:15,自引:0,他引:15
Criteria are established for three classes of models of single-species dynamics with a single discrete delay to have a globally
asymptotically stable positive equilibrium independent of the length of delay.
Research partially supported by the NSERC of Canada, grant No. A4823.
Research was carried out while the author was a distinguished visitor at the University of Alberta. 相似文献
2.
K. Gopalsamy 《Bulletin of mathematical biology》1983,45(3):295-309
An autonomous system of two differential equations with an asymptotically stable steady state is considered. It is shown that
there exists a class of time delays which preserves the stability of such a steady state. The charactristic return time (or
decay rate) for the solutions to approach the steady state is estimated using the variational system for the perturbations. 相似文献
3.
K. Gopalsamy 《Bulletin of mathematical biology》1980,42(6):871-887
The Lotka-Volterra system of prey-predator equations is considered with a special type of continuous time delay. In the case
of equal diffusion coefficients Hopf’s bifurcation technique is used to show the existence of travelling wave train solutions
for the prey-predator system. 相似文献
4.
Ni Y Gopalsamy A Cole D Hu Y Denny R Ipek M Liu J Lee J Hall JP Luong M Telliez JB Lin LL 《Bioorganic & medicinal chemistry letters》2011,21(19):5952-5956
We report here the synthesis and SAR of a new series of thieno[3,2-d]pyrimidines as potent Tpl2 kinase inhibitors. The proposed binding mode suggests the potential flipped binding mode depending on the substitution. Biacore studies show evidence of binding of these molecules to the protein kinase. The kinome inhibition profile of these molecules suggests good selectivity. 相似文献
5.
K. Gopalsamy 《Mathematical biosciences》1982,61(1):101-122
Sufficient conditions are obtained for the existence and linear stability of stationary age distributions in a two-species competition model with age-dependent mortality and fertility functions. 相似文献
6.
Dan M. Berger Nancy Torres Minu Dutia Dennis Powell Greg Ciszewski Ariamala Gopalsamy Jeremy I. Levin Kyung-Hee Kim Weixin Xu James Wilhelm YongBo Hu Karen Collins Larry Feldberg Steven Kim Eileen Frommer Donald Wojciechowicz Robert Mallon 《Bioorganic & medicinal chemistry letters》2009,19(23):6519-6523
As part of our research effort to discover B-Raf kinase inhibitors, we prepared a series of C-3 substituted N-(3-(pyrazolo[1,5-a]pyrimidin-7-yl)phenyl)-3-(trifluoromethyl)benzamides. X-ray crystallography studies revealed that one of the more potent inhibitors (10n) bound to B-Raf kinase without forming a hinge-binding hydrogen bond. With basic amine residues appended to C-3 aryl residues, cellular activity and solubility were enhanced over previously described compounds of this class. 相似文献
7.
K. Gopalsamy 《Bulletin of mathematical biology》1981,43(4):463-485
A perturbation method is proposed to calculate approximately the limit cycle type nonequilibrium steady-state resulting from
periodic perturbation of coefficients of stable population systems; the two species Lotka-Volterra competition system is explicity
studied and the results are formulated for general multi-species population systems. Avoidance of competitive or other types
of exclusion of species in a periodic environment is indicated. 相似文献
8.
K. Gopalsamy 《Journal of mathematical biology》1984,21(2):145-148
It is shown that a strongly self-regulating (or resource limited) Lotka-Volterra population system can persist in a periodic or almost periodic environment if and only if the system tracks the environmental variations. 相似文献
9.
Tetrasaccharide cap present in lipophosphoglycan of the Leishmania donovani responsible for visceral Leishmaniaisis is synthesized as a fully protected propargyl glycoside. AuBr(3) mediated selective glycosylation of propargyl 1,2-orthoester in the presence of propargyl glycoside is employed as a key step to obtain propargyl containing oligomers. Further, propargyl tetrasaccharide is connected with a long chain hydrocarbon containing azidothiol functionality situated at two terminal ends via 'click' reaction. 相似文献
10.
Gopalsamy A Shi M Ciszewski G Park K Ellingboe JW Orlowski M Feld B Howe AY 《Bioorganic & medicinal chemistry letters》2006,16(9):2532-2534
A novel class of HCV NS5B RNA dependent RNA polymerase inhibitors containing 2,3,4,9-tetrahydro-1H-carbazole and 1,2,3,4-tetrahydro-cyclopenta[b]indole scaffolds were designed and synthesized. Optimization of the aromatic region showed preference for 5,8-disubstitution pattern in both the scaffolds examined while favoring the n-propyl moiety for the C-1 position. 1,2,3,4-tetrahydro-cyclopenta[b]indole scaffold was slightly more potent than the corresponding 2,3,4,9-tetrahydro-1H-carbazole and analogue 36 displayed an IC50 of 550 nM against HCV NS5B enzyme. 相似文献