The schizogony of Polychromophilus (Haemoproteidae), cosmopolitan parasite of Microchiroptera]

The schizogony of Polychromophilus was partially known by the findings of Schingarew, Mer and Goldblum who demonstrated microschizonts in the reticulo-endothelial tissue. The present work completes these data by showing the presence of macroschizonts in the lungs of both African and European species. These schizonts are characterized by their large size, the hypertrophy of the host cell and its nucleus and the evolution of the parasite apparently slow when young, becoming rapid later.     

Accumulation of metals and mineral particles in the soft tissues of the edible cockle, Cerastoderma edule (Mollusca. Eulamellibranchia). Relation to the environment]

There are two types of metallic accumulations. The first type is constant in localisation and composition. The second type is casually encountered, included in hemocyte nodules, changing with environment and some of its components are incorporated in inorganic particles.     

Increase in the oxygen available to the cerebral cortex after the administration of carbonic anhydrase inhibitors]

Oxygen tension (pO2) in cerebral cortex was measured by polarographic method in unanesthetized rabbits. Intravenous administration (25 mg/kg) of carbonic anhydrase inhibitors (acetazolamide, methazolamide, dichlorphenamide, sulthiame) induced an early important rise of cortical p O2, which is not dependent on increase of p O2 and p CO2 and decrease of pH in arterial blood. High dosage of acetazolamide (250 mg/kg) produced the same effect and did not suppress the increase of cortical p O2 under air-CO2 inhalation. This result suggests that CO2 might act specifically upon cerebral vessels.     

Serotoninergic innervation of the paraventricular organ in chick embryo and chick; histofluorescence and autoradiography study optic and electron microscopy]

Fluorescence microscopy (Falck and Hillarp technique) of 11th day old chick embryo shows aminergic neurons and processes in the paraventricular organ area. Administration of tritiated amines permits us to observe uptake and storage of serotonin only as early as the 10th day; this suggests a very early hypothalamic serotoninergic nervous system differentiation.     

Trend of of stature in France]

The average stature of 23,400 young adults was 172.33 cm in 1974; it is not the final size because they were 18 to 20 years old. Compared to previous data, we note that the rate of increase grows: it was of 0.3 cm every 10 years at the beginning of the century, of 1 cm in the middle of this century, actually it reaches 1.7 cm per ten years. Studying the correlations between the increase of stature and the variations of some factors during this century, we find multiple correlations accounting for the conditions of life, without a predominant factor. Among the sample of 1974, we find again the same result. The genetic factors (consanguinity, exogamy) show more modest correlations than mesological factors. The mental capacities show the strongest correlation, but does not explain the tendency occuring one in a hundred year. We still do not know why children grow quicker and reach a final bigger size than in the past.     

Zur Frage des Virusrezeptors von perjodatbehandelten roten Blutkörperchen

Summary Absorption tests have shown that those receptors of the erythrocytes which can be oxydised with JO₄-ions cannot be regarded as identical with the virus receptors.