Quantitative Biologie und Morphologie des Wachstums einschließlich Hypertrophie und Riesenzellen

A Radioautographic Study With H3-Thymidine on Adrenal Medulla Nuclei of Rats Intermittently Exposed to Cold

“…In this connection it must be considered that (a) these cells are irreversibly postmitotlc or perennial (30), and that (b) their content of D N A per nucleus is greater (from 16 to 39%), according to reference 2) than that of a typical diploid cell, such as that of the kidney tubules. The first circumstance does not allow the tissue to respond to a strong stimulation with an increase in the number of the cells, as is the case in other tissue (the adrenal cortex (31) and other endocrine glands (32)), in which hyperplasia brings about a reduction of the functional load onto the individual cells. The second circumstance suggests (as pointed out previously (2)) that the over-all variations of D N A content may involve mainly this extra fraction of DNA, and only partially the D N A associated with the chromosomal sets.…”

Some observations on the nuclear apparatus of insect muscle cells.

“…We have never observed mitotic figures. The structure of the nuclear chain as well as the remnant chromatinic bridges joining frequently two or more nuclei would indicate that we are in presence of an amitotic division process or a phenomenon of nuclear fission comparable to that existing in the macronucleus of Protozoa (Hartmann 1909, 1953, Fischer 1936, Hort 1953, Linzbach 1947, 1955, Pessacq 1969.…”

HAAVA PARANEMINE SILIKOOSI PUHUL II. Organisatsiooniprotsessi histokeemiline iseloomustus (Eksperimentaalne uurimus)

“…Vanemad autoriu pidasid neid bioloogiliselt mittetäisväärtuslikeks rakkudeks. Uuemate uurimuste alusel on nad kõrge ainevahetusliku aktiivsusega rakud (Linzbach, 1955;Gedigk, Bontke, 1957;Gusek, 1958). Hiidrakkude geneesi suhtes on enamik autoreid arvamusel, et nad tekivad tuumade amitootilise jagunemise teel makrofaagidest (Wurm, 1956;Gusek, 1958Gusek, , 1962.…”

“…Hiidrakkude geneesi suhtes on enamik autoreid arvamusel, et nad tekivad tuumade amitootilise jagunemise teel makrofaagidest (Wurm, 1956;Gusek, 1958Gusek, , 1962. Mõne autori (Linzbach, 1955) andmeil tekivad hiidrakud kõige tõenäolisemalt veresoonte endoteelist, millel on füsioloogiline kalduvus süntsütsiaalsete struktuuride moodustamiseks.…”