L'intégration chronospatiale des accumulations calcaires : Approche morphopédologique et géochimique dans un paysage semi-aride de l'Atlas tellien (Algérie)

Doctoral thesis (1983)

A problem checklist and the clinical resume

in Revue Médicale de Liège (1983), 38(23), 897-905

Les malformations congénitales dans un service de néonatologie.

Conference (1983, November 21)

Statistical determination of the precision obtained by a photometric reduction algorithm

in Statistical Methods in Astronomy (1983, November 01)

Numerical simulations were used to assess the multinight technique for UV by photometric data reduction. Observation sets were created for 1, 2, 4, 8 and 16 nights. The standard values were assumed to be ... [more ▼]

Numerical simulations were used to assess the multinight technique for UV by photometric data reduction. Observation sets were created for 1, 2, 4, 8 and 16 nights. The standard values were assumed to be accurate to 0.004 magn. and the error in the measurements was 0.006 magn. A total of 20 standard stars were kept, along with 20 constant stars, giving an average of 16 stars every night. Analysis shows that the multinight procedure leads to a dramatic improvement in the precision of the results. [less ▲]

Etude complémentaire de la cytotoxicite de la mélinonine F, alcaloide dérive de la beta-carboline

in Planta Medica (1983), 49(11), 158-161

The cellular effects of melinonine F, an alkaloid isolated from STRYCHNOS MELINONIANA (South America) and STRYCHNOS USAMBARENSIS (Central Africa), are analysed in cancer or normal cells in culture. A ... [more ▼]

The cellular effects of melinonine F, an alkaloid isolated from STRYCHNOS MELINONIANA (South America) and STRYCHNOS USAMBARENSIS (Central Africa), are analysed in cancer or normal cells in culture. A cytotoxic action is noted in both types of cells, at least for relatively high concentrations. These effects are probably due to interaction of the drug with chromatin. Physico-chemical analysis demonstrates partial intercalation of melinonine F on pure DNA IN VITRO. [less ▲]

Innervation adrénergique de la vessie dans la sénescence. Etude histoenzymologique

Conference (1983, November)

Sodium-Lithium countertransport in red cells

in New England Journal of Medicine [=NEJM] (1983), 309(16), 987-988

To the Editor : Woods et al. provide evidence for a decrease in the rate of sodium-lithium countertransport in red cells after hemodialysis, and suggest that this effect is related to the removal of a ... [more ▼]

To the Editor : Woods et al. provide evidence for a decrease in the rate of sodium-lithium countertransport in red cells after hemodialysis, and suggest that this effect is related to the removal of a plasma factor. They did not observe a difference in ouabain-dependent sodium efflux during hemodialysis, but this conclusion is based on data in only two patients. This latter observation disagrees with previous date, which demonstrated a decrease in the sodium-potassium pump activity in patients with chronic renal failure. We have studied the sodium exchange in red cells of 11 patients receiving hemodialysis. These date suggest that the modifications in the rate of ouabain-sensitive sodium efflux observed after hemodialysis may be related to a volume-dependent plasma factor and not only to a decrease in th concentration of a dialyzable factor; this factor may be similar to the "natriuretic digoxin-like factor" postulated by de Wardener and MacGregor as playing a part in primary hypertension. It is also possible that the effect observed by Woods et al. on sodium-lithium countertransport is linked to improvement of the sodium-pump activity. [less ▲]

Newly Synthesized mRNA Is Translated During the Initial Imbibition Phase of Germinating Maize Embryo

in Plant Physiology (1983), 73(2), 484-487

RNA synthesis is activated in the cells of the plant embryo very soon after the start of seed imbibition. We previously reported that mainly heterogeneous nuclear RNA is synthesized in the radicle of Zea ... [more ▼]

RNA synthesis is activated in the cells of the plant embryo very soon after the start of seed imbibition. We previously reported that mainly heterogeneous nuclear RNA is synthesized in the radicle of Zea mays embryo during the first hours of germination. The present study was undertaken in order to detect the time of appearance of the newly synthesized messenger RNA in the polysomes of germinating maize axes.Free polysomes were prepared from embryonic axes rehydrated for 2 hours in the presence of radioactively labeled uridine. These polysomes were shown to be labeled and to contain labeled particles sedimenting, after dissociation with EDTA, in the 10S to 40S region of a sucrose gradient. The labeled polysomal RNA migrates heterogeneously in a gel with a mean size corresponding to about 16S, and 60% of these molecules are polyadenylated.The data indicate that the newly synthesized RNA associated with the polysomes after 2 h of germination consists of messenger RNA molecules. Analysis of the polysomes prepared 0.5 and 1 h after the start of imbibition suggests that translation of the newly synthesized messenger RNA probably occurs within the 1st hour of imbibition of the isolated axis, thus well before the completion of the initial water uptake. [less ▲]

Laboratory tests and normal operation regarding the electric field intensity.

in Proceedinsg of the 4th ISH (1983, September 05)

Influence of the electrode shape and room size in testing is investigated.

La guattegaumerine, nouvel alcaloide bisbenzylisoquinoleinique de Guatteria gaumeri

in Planta Medica (1983), 49(9), 25-7

The aqueous-alcoholic extract of the bark of GUATTERIA GAUMERI (Mexican Annonaceae) is used for the treatment of cholelithiasis and hypercholesterolemia. Therefore it seems very interesting to perform a ... [more ▼]

The aqueous-alcoholic extract of the bark of GUATTERIA GAUMERI (Mexican Annonaceae) is used for the treatment of cholelithiasis and hypercholesterolemia. Therefore it seems very interesting to perform a phytochemical study of this drug in order to know its composition and to determine, if possible, all the active principles. We describe now the isolation of the main alkaloid named guattegaumerine. This new bisbenzylisoquinoline alkaloid has been assigned structure 1, on the basis of spectroscopic, chemical and chromatographic evidence. [less ▲]