Osservazioni Sull'Ultrastruttura Delle Cellule Cribrose diPsilotum Nudum(L.) Beauv.

I giornali delle sperienze e osservazioni relativi alla fisiologia della generazione e alla embriologia sperimentale

Reviewed by Mario A. Di Gregorio, M.A., Ph.D., F.L.S., Darwin College, Cambridge. The more the scope of research in the history of science widens, and the more intriguing the problems it touches appear to us, the more we feel the necessity to refer to the original sources represented by unpublished material. Thus archives are now invaluable points of reference in our research. It often happens ...

Elenco Delle Citazioni

Structurally fixed modes of systems described by Rosenbrock's polynomial matrices" Int.Controllability of linear single-input positive discrete-time systems", Int.Spectral characterization and pole assignement for positive linear discrete-time systems" INT. 5-M.E. Valcher "Controllability and reachability criteria for discrete time positive systems" INT.Primitivity of positive matrix pairs. Alg...

De la cellule biologique à la cellule urbaine : retour sur trois expériences de modélisation multi-échelles à base d'agents

Simulating complex natural or social systems often implies to consider entitites at several levels of organisation, and take into account the way they influence each other. The choice of scales is driven by both methodological and thematic constraints which among others include the objects of significiance for the specialists, availability of relevant data for comparison, question of interest a...

Bioactive selaginellins from Selaginella tamariscina (Beauv.) Spring

A new selaginellin named selaginellin O (1), along with three other known selaginellins (2-4) were isolated from Selaginella tamariscina (Beauv.) Spring. On the basis of spectroscopic analysis, the structure of selaginellin O was demonstrated to be 4-[(4'-hydroxy-4-formyl-3-((4-hydroxyphenyl)ethynyl)biphenyl-2-yl)(4-hydroxyphenyl)methylene]cyclohexa-2,5-dien-1-one. Compound 1, 2 and 3 exhibited...

Polyembryony in Hierochloe Odorata (l.) Beauv