Satellite measurements of high-altitude twilight Mg/plus/ emission

in Journal of Geophysical Research (1976), 81

Observations made by the ultraviolet spectrometer on board the orbiting geophysical observatory OGO 4 confirmed the presence of resonance scattering at 2800 A of Mg(plus) ions in the twilight subtropical ... [more ▼]

Observations made by the ultraviolet spectrometer on board the orbiting geophysical observatory OGO 4 confirmed the presence of resonance scattering at 2800 A of Mg(plus) ions in the twilight subtropical ionosphere. The column density reached 4 billion ions/sq cm above 160 km. Photometric measurements by the ESRO TD 1 satellite revealed a maximum of the Mg(plus) abundance at equinoxes in the top side F region. The interhemisphere asymmetries observed in the intensity distribution are essentially attributed to the effect of eastward thermospheric winds. The 2800-A doublet was also detected by OGO 4 at middle and high latitudes from 110 to 250 km. The brightness of the emission and other evidence indicate that evaporation of meteoritic matter cannot explain the abundance of ions at 200 km. Therefore Mg(plus) ions are probably transported upward from the 100-km permanent source layer. [less ▲]

Decay of Forbidden Lines in a Recombining H N Region

in Astronomy and Astrophysics (1976), 46

Abstract image available at: http://cdsads.u-strasbg.fr/abs/1976A&A....46...31M

Préparation enzymatique de peptides du type (L)meso-diaminopimélyl(L)-D-Ala[14C]: par réactions d'échange entre les peptides correspondants non radioactifs et la D-alanine [14C]

in Biochimie (1976), 58(10), 1167-1172

Membrane bound LD-transpeptidase of Streptococcus faecalis ATCC 9790 was used to catalyse transpeptidation reactions between non radioactive peptide donors of the general type: L-Ala-D-Glu (L)meso-A2pm(L ... [more ▼]

Membrane bound LD-transpeptidase of Streptococcus faecalis ATCC 9790 was used to catalyse transpeptidation reactions between non radioactive peptide donors of the general type: L-Ala-D-Glu (L)meso-A2pm(L)-D-Ala and D-(14C) alanine acceptor. The presence of one or two amide residues on the carboxyl groups of glutamic acid and meso-diaminopimelic acid increases the transfer reactions and subsequently the yield in radioactive peptides L-Ala-D-Glu (L)meso-A2pm(L)-D-(14C) Ala. [less ▲]

On the approximation of incompressible solids in the displacement method

Report (1976)

A mathematical analysis of the numerical approximation to incompressibility with nearly incompressible displacement finite elements is presented. It explains why, as observed by many authors, convergence ... [more ▼]

A mathematical analysis of the numerical approximation to incompressibility with nearly incompressible displacement finite elements is presented. It explains why, as observed by many authors, convergence to the incompressible solution is not necessarily obtained when Poisson's ration is increased up to 0.5. It also allows predicting under which conditions convergence of the nearly incompressible approach is guaranteed. [less ▲]

Aspects quantitatifs et qualitatifs nouveaux de la consommation d'espace par l'industrie. Quelques observations dans les provinces de Liège et de Limbourg

in Dejean Christian (Ed.) Actes du 94e Congrès de l'Association française pour l'Avancement des Sciences (1976)

Test for measuring the space consumed by the new industrial establishments (1948-1970) in two Belgian provinces and test to determine the nature of space consumed

Occupation et consommation de l'espace urbanisé. Quelques observations en Belgique

in La Géographie (1976), (108), 25-42

This article examines the recent development of urbanized areas in Belgium and endeavours to measure the space consumed by some of the important human activities: industrial operations, main arteries ... [more ▼]

This article examines the recent development of urbanized areas in Belgium and endeavours to measure the space consumed by some of the important human activities: industrial operations, main arteries, housing and urban functions. Notwithstanding a considerable lack of data, the gravity of the situation in Belgium is clear : since 1929, the amount of urbanized area has more than doubled, and, in 1970, the proportion of national territory which was urbanized (28 %) was far higher than in any of the neighbouring countries. It is therefore essential to control the use of land by means of a dynamic policy in country planning and development. The waste of land must be stopped by promoting the concentration of activities in specific centres, by keeping the majority of functions in the heart of the urban network, by assisting the use and re-use of available sites and by controlling any new developments, particularly housing schemes. [less ▲]

Sur l'action antioedème de l'escine

in Bulletin de la Société Royale des Sciences de Liège (1976), 9-10

Anti-inflammatory activity of escine. - Escine is one of the most active saponines extracted from Aesculum hippocastanum. As a pure compound, escine-Na inhibits exsudative oedema induced locally in the ... [more ▼]

Anti-inflammatory activity of escine. - Escine is one of the most active saponines extracted from Aesculum hippocastanum. As a pure compound, escine-Na inhibits exsudative oedema induced locally in the rat skin by dextran (MW (0000). This inhibition is due, for a small part, to the release of adrenaline by adrenal medulla; for an other part, to an interaction with glyco-cortico-steroids from the adrenal cortex and, finally, to direct potent vasoconstriction. [less ▲]

Distribution of Cd, Zn and Cu in the mussel Mytilus edulis. Existence of Cd-binding proteins similar to metallothioneins.

in Experientia (1976), 32

A propos de deux problèmes rencontrés dans la construction de tarifs de cubage : le choix des équations de régression et l'échantillonnage des arbres

in Bulletin des Recherches Agronomiques de Gembloux (1976), 11(1-2), 243-257

Today tarif tables construction is based upon the fitting of equations or models. In most cases criteria used are not sufficiently defined. When constructing volume tables for spruce (Picea Abies Karst ... [more ▼]

Today tarif tables construction is based upon the fitting of equations or models. In most cases criteria used are not sufficiently defined. When constructing volume tables for spruce (Picea Abies Karst.), the authors have tested various criteria of precision and studied the influence of the number and the distribution of sampled trees on the parameters of various equations already considered in Belgian volume tables. [less ▲]

Des poisons de flèches aux réactifs pharmacologiques de pointe

Scientific conference (1976)