Physico-chimie,biologie, information et connaissance

Resume Cet article définit une notion de distance physico-chimique entre l'être vivant et son environnement, distance créée par la disjonction de leurs évolutions (voir Solignac VI et VIII). Apres quoi, il essaye (en vain) de la comprendre dans les termes de la théorie de l'information.

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This paper deals with the notion of physico-chemical distance between the living being and its environment, as the result of their separate evolution (see Solignac VI and VIII). Then, it attempts (in vain) to understand it in the theory of information.

     

Trypsine,amylase et protéines du zooplancton: Dosage automatique et manuel

An automatic method for the measurement of trypsic activity in studies of zooplankton proteolytic digestion is described. Modifications of amylase and protein determinations previously published as indices of herbivorous digestion and of biomass, are given. Up to 40 samples can be analysed within one hour with an improved level of sensitivity. These methods are well adapted for studying very small numbers of zooplankton organisms and give reproducible results. Equivalent manual methods are also described.     

Compositae novae persicae,afghanicae et kurdicae

Ohne Zusammenfassung     

Osidases,nitrite et nitrate réductases dans les genres Hanseniaspora et Kloeckera

Intracellular osidases, nitrite reductase and nitrate reductase were found in some species of Hanseniaspora and Kloeckera. Taxonomical relationships between the 2 genus are discussed.     

Produits neutres et alcaloides de Myrtopsis macrocarpa,M. myrtoidea,M. novae-caledoniae et M. sellingii

Stems and leaves of Myrtopsis macrocarpa, M. myrtoidea, M. novae-caledoniae and M. sellingii yielded terpenes, sterols, coumarins, alkaloids (furoquinolines and quinolones) and amides. A new quinolone (8-methoxy flindersine) occurs in Myrtopsis macrocarpa, a new amide (N-benzoyltryptamine) in M. myrtoidea, two new coumarins (myrsellin and myrsellinol) and a new dihydrofuroquinoline (myrtopsine) in M. sellingii. Structures of the new compounds are proposed from chemical and spectroscopic evidence.