Properties of irrotational vector fields

In the first part we present properties of irrotational vector fields and in the second part properties of arbitrary vector fields, all arising from the study of the energy associated to the vector field. The results relate to critical points and extrema of the energy, the Riemannian structure on the manifold, the behaviour of the energy along orbits of the field and the type of these orbits.     

Synthesis and Characterization of Alumina R Chemically Modified with n-Octyl for Use as a Stationary Phase in TLC

JPC – Journal of Planar Chromatography – Modern TLC - A stationary phase for thin-layer chromatography has been prepared by attaching 1-octene to alumina R. This stationary phase has...     

The major conjugates of ecdysteroids in young eggs and in embryos of locusta migratoria

Newly-laid eggs of migratory locust contain as the major ecdysteroid conjugate donated by the female to its offspring the 22-adenosinemonophosphoric ester of 2-deoxyecdysone; in 8 days old embryos, the major ecdysteroid is the 3-phosphate of 3-epi 2-deoxyecdysone.     

Spectres de masse de phospholipides et polypeptides non proteges. Une technique simple d'obtention du spectre complet.

Direct introduction of diacyl-lecithins in the ionization chamber on a gold support gives the molecular ion and structurally significant fragments; the same is true with unprotected small polypeptides.