Biologie générale

SYL-1117 = Première partiePremière partie :biologie cellulaireinfo:eu-repo/semantics/published

Purines libres et mononucléotides dans l'embryon de batracien

It has been shown that frog embryos contain free hypoxanthine and guanine. These purines are present in the mature oocytes and begin to disappear at the following early gastrulation. An appreciable synthesis of ATP begins to take place at the tailbud stage. A hypothesis is formulated as to the probable rôle of free purines in nucleic acid synthesis. © 1951 Birkhäuser Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Biologie générale

SYL-757 = 1ère partie1ère partie :biologie cellulaireDeuxième édition 1974 Deuxième tirage 1975-1976info:eu-repo/semantics/published

Sur la presence de bases puriques libres dans les oufs de batraciens

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Métabolisme de l'acide ribonucléique dans l'ȩuf d'amphibien traité au dinitrophénol

1. 1. The synthesis of ribonucleic acid in the eggs of Batrachians is inhibited by DNP and usnate. 2. 2. The progressive decrease in the amount of free purine bases is not observed when the embryos are treated with DNP. 3. 3. The O 2 consumption of DNP-treated eggs is much increased compared with that of normal eggs. 4. 4. These observations confirm Brachet's hypothesis as to the role of the nucleus in the linkage of oxidations and oxidative phosphorylations. © 1953.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

DNA sequence analyses as a tool in the diagnosis and epidemiology of trypanosomiasis

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Métabolisme de l'acide ribonucléique dans l’œuf d'amphibien traité au dinitrophénol

info:eu-repo/semantics/publishe

Incorporation de bases puriques marquées par les embryons de batraciens

Known amounts of adenine-8-14C and hypoxanthine-8-14C have been micro-injected into Amphibian gastrulae. Both precursors are quickly incorporated into ATP and nucleic acids, but only hypoxanthine can be converted into guanine to a large extent. It seems that free purines, especially hypoxanthine, are the natural précursors of the nucleic acids purines during early development. © 1955.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Specific loss of kinetoplastic DNA in trypanosomatidae treated with ethidium bromide

Dividing haemoflagellates lose their kinetoplast DNA in the presence of ethidium bromide. Resting cells are not so affected by the drug. It is suggested that loss of kinetoplast DNA is due to selective inhibition of replication and to dilution. © 1969.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Easy detection of the nucleolar organizers in amphibian oocytes

When amphibian oocytes (X. laevis, R. pipiens) are treated for a few minutes with the detergent SDS (0.3%) and then transfered to amphibian Ringer, the nucleolar organizers become visible, with the Feulgen reaction, as pink, central bodies. The are particularly easy to see when the Feulgen stained sections are examined under a fluorescence microscope. The possible applications of these observations for future work are discussed. © 1972, Taylor and Francis Group, LLC.SCOPUS: ar.jinfo:eu-repo/semantics/publishe