Alcaloides d'Alstonia lanceolifera

From the aerial parts of Alstonia lanceolifera six alkaloids were isolated and identified: O-trimethoxycinnamoylvincamajine, O-trimethoxy-cinnamoyl-10-methoxyvincamajine, O-trimethoxycinnamoyl-10-hydroxyvincamajine, O-trimethoxybenzoylhydroxyvincamajine, 10-methoxyvincamajine, N(a)-methyl-10-methoxyakuammidine. These alkaloids are new compounds, except for the first. The position of aromatic substituents was determined by study of the Nuclear Overhauser Effect (N.O.E.) in the NMR spectra.     

Révision taxonomique du genre d'ammonite téthysien Simoceras et création d'un nouveau genre Volanoceras (Ammonitina,Simoceratidae)

The type-species of the genus SimocerasZittel isS. biruncinatum (Qu.). This genus includes the species-group biruncinatum (Qu.) — admirandum (Zitt.). The new genus Volanoceras is created for the volanense (Opp.) species-group which is excluded from the genus Simoceras.     

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

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.     

Winwaloeusia,genre nouveau d'Acritarche du Devonien

Any Acritarchs that previously were included in the genus Veryhachium (DEUNFF 1954) are transferred in the new genus Winwaloeusia.     

Creusia oraniensis nov. sp. (Cirripedia,Creusiinae) du Miocène terminal d'Oranie (Algérie)

A new Balanomorph Cirripedia, in the subfamilyCreusiinae, Creusia oraniensis nov. sp., is described. It is found in various reef sites of the Uppermost Miocene near Oran (Algeria). Its paleoecology is also discussed.     

Epistreptophyllum (Hexacorallaire Jurassique), genre colonialou solitaire? examen d'un matériel nouveau d'Israel

Epistreptophyllum, a rather common coral in the Middle and Late Jurassic of Europe and Asia, is generally regarded as solitary. Some specimens collected in Late Callovian beds of the northern Negev, Israel, show genuine branching which would suggest a colonial habit for this genus. Eventual convergence between the genera Epistreptophyllum, Haplaraea and Diplaraea is presumed.     

Trietrpenoides d'Agauria salicifolia

3-acetylmorolic acid, 3-acetylmoradiol, 3-acetylmoraldehyde, taraxerol, taraxerone, sitosterol and agauriasterone, an isomer of nor-31-lanosterone, have been isolated from the methanolic extract of the bark of Agauria salicifolia.     

Decouverte d'un Cobitidae (poisson teleosteen,Cypriniforme) dans le Pliocene continental des environs de Rochefort-Montagne (Puy-de-Dome)

A single incomplete specimen of Teleost fish has been discovered in lignitic shales of Pliocene age croppingout West of Rochefort-Montagne (Puy-de-Dôme, France). The specimen is referred to the recent species Cobitis taenia L., to which it appears identical in every respect. The presence of Cobitis cf. taenia L. in the Pliocene of Rochefort-Montagne allows the environment of deposition of the lignitic shales, which are rich in fossil plants, to be more precisely defined.     

Une nouvelle espece d'algue dasycladale: Terquemella concava nov. sp., dans les calcaires a “tubulures” d'age portlandien de la Cluse-des-Hopitaux (Jura meridional)

In the portlandian limestones of the southern Jura mountains (Cluse-des-Hôpitaux), a dasyclad algae level provides a new species: Terquemella concava nov. sp., characterized by its sub-hemipheroidal shape. The type-level is made up of a burrowed biomicrite. The in-filling of the burrows consists of grains with meniscus cements, attesting of a vadose diagenesis of the bed.     

Isoenzymes de l'anhydrase carbonique d'un poisson euryhalin: Variations en relation avec l'osmoregulation

A chemical study of carbonic anhydrase (EC 4.2.1.1) from the red blood cells and the gills of an euryhaline fish (Anguilla anguilla) is presented. Animals adapted to fresh water were compared to those adapted to sea water.The physicochemical constants of the various molecular forms isolated by chromatograhy and isoelectric focusing were determined; isoeleletric pH, molecular weight, and the K_m and V/E of the enzyme dehydration activity were compared.In both red cells and gills of fish adapted in either media various forms were isolated, characterized by different enzymatic kinetics (high- and low-activity forms) but having the same molecular weight (27 250). Some isoenzymes isolated from the gills differed significantly from those isolated from the red cells.Adaptation to fresh water or sea water is accompanied by modifications in the distribution of yhe isoenzymes in both red cells and gills: adaptation to sea water is characterized by a shift of the molecular forms towards an isoelectric pH higher than pH = 6.The role of these enzymes is discussed under both a physiological and biochemical point of view in relation to the electrolyte exchange across fish gill. The origin of the different molecular forms of the carbonic anhydrase is discussed in relation to the prevailing theories on this subject.     

Position systematique et phylogenetique du genre Pelagosaurus Bronn, 1841 (Crocodylia,Mesosuchia), du Toarcien d'Europe

The Toarcian crocodilian Pelagosaurus, usually considered as belonging to the family Teleosauridae, has a numberof apomorphic characters in common with the Metriorhynchidae, and is referred here to this family, as already suggested by J. Mercier (1933). The Metriorhynchidae were apparently descended from early Liassic Teleosauridae, and both families can be included in the same infraorder of the Mesosuchia, the Thalattosuchia FRAAS.     

Lanveocia et Candelasphaeridium,genres nouveaux d'Acritarches des gres de Landevennec (Gedinnien inferieur de la rade de Brest - Finistere)

Two new genera of organic-walled microplancton (Acritarchs) are described. All are from the Early Devonian(Early Gedinnian) Grès de Landévennec (Rade de Brest - Finistère). Lanveocia formosa (type species) and Candelasphaeridium insolitum (type species) are described.     

Alcoxyhalogenation d'acides gras acetyleniques vrais ou disubstitues

Reaction of t-butyl hypobromite (HBBT) with true or disubstituted acetylenic fatty acids leads to the formation of gemdimethoxy gemdibromides, resulting from the addition of two mol of HBBT upon each mol of substrate. Neither digemmethoxybromide nor vinylic methoxybromide, resulting from the addition of only one mol of HBBT, are formed.If the triple bond is a terminal one, only the Markovnikov addition compound is formed but if the triple bond is located in the middle of the chain, the both possible isomers are present.     

Presence de pollens d'Hamamelis (Hamamelidaceae,Angiospermae) dans le pliocene du Sud de la France

Pollen-analysis shows the presence of the genus Hamamelis in the pliocene flora of southern France. It contributesto the knowledge of the past distribution of taxa which are now extinct in western Europe.     

A propos de la presence d'un “canal spiral”chez Daxia CUVILLIER & SZAKALL (Foraminifera,Lituolidae)

The presence of a spiral channel within the external marginal part of the whorls of Daxia CUVILLier &0611 SZAKALL, described by B. Laug & B. Peybernès, cannot be confirmed. The generic attribution of “D”. minima LAUG & PEYBERNES is not yet clear.     

Mise en evidence d'un dispositif structural nouveaude la coquille des brachiopodes chez “Rhynchonella” CF. Phaseolina DESL. (Rhynchonellida-Jurassique)

New features are detected on the marginal edges of the valves of rhynchonelloid brachiopods belonging to the“Rhynchonella” phaseolina DESL. and Parvirhynchia minuta (BUV.) group. They are described as hinge pouchs and commissural grooves on the shell of “R.” cf. phaseolina, a new found member of the group from the lower Bathonian of Nièvre (France). Fonctionnal, ontogenetic and taxinomic implications must be considered.     

Cherasco (Piemont):un nouveau gisement de poissons fossiles du Messinien continental d'Italie

The study of the material gathered in a new locality of fossil Fishes found in the messinian marls, near Cherasco (Piedmont, Italy), leads one to point out the occurrence of three different species (one of which is new) in this locality. The analysis of the process of pachyostosis which seems to have affected in a selective way some of their representatives is made possible by the detailed investigation of the Cyprinodontid and Gobiid Fishes. In the light of this analysis, the taxonomic status of the genus Pachylebias WOODWARD is reevaluated. From a palaeoecological and palaeogeographical point of view, the locality of Cherasco seems to fit with an ancient water-body with a variable salt-content, which may have been more or less temporarily connected with the sea.     

Composes phenoliques du latex d'Hevea brasiliensis: aglycones

The latex of Hevea brasiliensis; clone PR 107, contains from 160 to 1100 μg total phenolics per ml. This wide variability is associated with season, tapping system and application or not of a stimulant (Ethrel). The following aglycones have been identified in hydrolysed extracts: vanillic, salicyclic, syringic, gentisic, p- and m-hydroxybenzoic and protocatechuic acids; scopoletin, aesculetin and coumarin; ferulic, sinapic, caffeic, o- and p-coumaric acids; quercetin and kaempferol; tyrosine and dihydroxyphenylalanine. Flavans and condensed tannins are also present in latex.     

Première datation du Turolien à la base de la formationde Guadix (secteur d'alba,Almeria, Espagne)

In the North of Abla (Almeria), SE of the Guadixbasin some bones of Hipparion gromovae granatenseAguirre have been found this has allowed us to date, for the first time, the bottom of the Formation of Guadix as upper Turolian.