[Inhibitory effect of exogenous histones on cellular growth and DNA synthesis in Chlamydomonas reinhardtii].

The addition of exogenous histones to synchronous culture of Chlamydomonas reinhardtii, at the beginning of the cell cycle, leads to the death of the cells. The same amount of histones added in the middle of the cycle, only blocks the cell division. The mechanism of this inhibition effect of the histones could involve a block at the level of the chloroplast DNA replication.

[Partial characterization of the histones of the hepatopancreas and testis of the shrimp Palaemon serratus].

The chromatin of Palaemon serratus hepatopancreas and testes has been isolated. All the classes of histones are present in the fractions studied so far. However, F1 harbors some characteristics different from that of Calf thymus F1.

A plasma protein mobilizing factor in dogs following hemorrhage.

Small amounts of whole blood from repeatedly bled donors increased the replacement rate of plasma protein in dogs, cats and rabbits subjected to hemorrhage. Results obtained within three hours were statistically significant. This strongly suggests that a chemical mediator, to hasten restoration of plasma protein levels, is released into the blood during hypoproteinemia.

Characterization and quantitation of the five major plasma protein fractions in seven-day-old piglets.

Cellulose acetate electrophoresis was applied to resolve, characterize and quantitate the five major plasma protein fractions of 7-day-old pigs. Purified Cohn fractions were added to the piglets plasma and the individual fractions characterized by similarities in mobilities. All mobilities were expressed relative to albumin.

Isolation and partial characterization of Chlamydomonas reinhardtii chromatin.

The use of a cell wall less mutant of Chlamydomonas reinhardtii allowed the isolation of the nuclei of this organism. The study of the extracted desoxyribonucleoprotein shows that a set of established properties of the chromatin of higher eucaryotes do not apply to this material. This is particularly the case for the failure to sediment in a good yield.