Louis Codomier

Mediterraneol a, a novel rearranged diterpenoid-hydroquinone from the marine alga cystoseira mediterranea

The isolation and structure determination by combined chemical and spectral methods of a novel biologically active metabolite mediterraneol A (Ia) from Cystoseira mediterranea are reported. Mediterraneol A was found to be an inhibitor of mitotic cell division.

An acyclic diterpene from the brown alga Bifurcaria bifurcata

Abstract Structure elucidation and total assignment of the 13 C NMR spectrum of 12-( S )-hydroxygeranylgeraniol, a new acyclic diterpene from the grown alga Bifurcaria bifurcata , was accomplished through the use of 1 HNMR, 13 C NMR and 2D NMR spectroscope including 2D long range 1 H- 13 C chemical shift correlations.

Cystoseirol A, a novel rearranged diterpene of mixed biosynthesis from the brown alga Cystoseira mediterranea

Abstract The skeleton of a novel class of rearranged meroditerpenoids was established by chemical and spectral methods, including heteronuclear shift correlations 1 H- 13 C 2D-NMR with long range coupling correlation.

Seasonal chemical evolution of the alga Cystoseira elegans

Abstract Among the Mediterranean algae belonging to the family Cystoseiraceae analysed for diterpenic compounds, only Cystoseira elegans contains eleganolone, epoxy-eleganolone and elegandiol, as does the Atlantic alga Bifurcaria bifurcata . Surprisingly, for the seasonal Cystoseira elegans , these compounds are present only at the beginning of growth of the alga during Spring and they disappear in the Summer yielding important seasonal variation data for diterpenoids, and also for sterols, alginic acid,mannitol and cellulose.

Sterols of the red alga Rissoella verruculosa

Abstract The Mediterranean red alga Rissoella verruculosa contains desmosterol in the esterified form whereas this sterol is not present in the free state.

Composes halogenes d'une algue rouge, Falkenbergia rufolanosa tetrasporophyte d' Asparagopsis armata

Abstract Water extraction of fresh Falkenbergia rufolanosa followed by water-ether partition, yielded halomethanes, polyhalo ethyl and methyl acetates and especially polyhalo acetones. It is the first example of polyhalo compounds extracted from a tetrasporophyte in the Bonnemaisoniaceae.

Lipids from the brown alga Cystoseira barbata

Abstract Two new diunsaturated lipids, related to palmitic acid, were isolated from the brown alga Cystoseira barbata , one of which is toxic to mice during P388 lymphocytic leukemia tests.

The occurrence of C28 sterols in red algae

Abstract Lenormandia prolifera and Amansia glomerata contain large amounts of 24-methylenecholesterol. These two algae belong to the Amansia group of Rhodomelaceae as do Rytiphloea tinctoria and Vidalia volubilis, which are already known to be able to alkylate sterols at C-24. Halopythis pinastroides is an exception in the Amansia group, no C-28 sterols being present in this alga.

Effets de l'iode sur la croissance des frondes d'Asparagopsis armata (Rhodophycées, Bonnemaisoniales) obtenues en culture à partir de rameaux à harpons

Abstract Effects of iodine on the growth of the « fronds » of Asparagopsis armata (Rhodophyceae, Bonnemaisoniales) in culture from spear bearing branches. – By adding doses of 5 μ moles per litre of iodide or iodate to a medium changed every six days, maximum growth for the « fronds » of Asparagopsis armata is obtained. Initial doses of iodide and iodate higher than 15 μ mole per litre inhibit the growth of this alga.

Effet de l'acide gibberellique (GA3) sur la croissance d'Asparagopsis armata (Rhodophycées, Bonnemaisoniales) en culture

Abstract Effect of gibberellic acid (GA3) on the growth of Asparagopsis armata in culture.—The gibberellic acid (GA3) stimulates the growth of the Asparagopsis armata in culture. This effect was observed by adding doses of 6,5X10−5M or 6,5X10−7M of this acid in Von Stosch medium.