Nuclear DNA content in Gastrotricha

A cytofluorometric evaluation of nuclear DNA content was carried out on fifteen species of Gastrotricha. Genome size, ranging from 0.05 to 0.63 pg, appears uniform in this group and rather low compared to values found in other lower Metazoa. Differences in DNA content between the two orders of the phylum, Macrodasyida and Chaetonotida, which differ greatly in morphology and reproductive biology, are not evident. From these data, a polyploid condition of obligatory parthenogenetic Chaetonotida seems unlikely.     

Nuclear chimaeras in the newt

Zusammenfassung Gruppen von 2–4 somatischen Kernen haploiderTriturus-Embryonen wurden in diploide, ungefurchte Eier injiziert, 11 haplo-diploide Mosaik-Larven entwickelten sich bis zum frühen Neurula-Stadium. Nachkommen von Kernen aus dem neuralen Ektoderm oder Chorda-Mesoderm von Spendern im Neurula-Stadium fanden sich in allen drei Keimblättern der Wirtslarve.     

Nuclear membrane and chromatin network

Résumé Il existen un certain rapport entre la chromatine et des petites invaginations de la membrane nucléaire. Nous estimons que la charge positive de la membrane et la charge négative des chromosomes peut être la cause inductrice.     

Polyamines and nucleic acids in the growing yeast

Riassunto Sono state studiate le modificazioni del contenuto di spermina, spermidina ed acidi nucleici in cellule diS. cerevisiae durante le varie fasi di crescita. Inoltre è stato osservato un effetto di stimolo della moltiplicazione cellulare esercitato dalla spermina sul lievito in cui era stato sperimentalmente aumentato il tempo di latenza.     

Nuclear DNA amounts in polychaete annelids

Zusammenfassung Bestimmung des DNS-Gehalts pro Zellkern in 36 Polychätenarten ergeben eine Häufigkeitsverteilung der Genomgrössen, die durch eine logarithmische Normalverteilung beschrieben werden kann. Eine Korrelation zwischen adaptiver Spezialisierung und reduzierten Genomen, wie sie bei Wirbeltieren gefunden wird, ist auch bei Polychäten angedeutet.

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The authors express their appreciation for help received from Dr.J. Simon andD. Dauer in identifying polychaete species and discussing their results.     

Nuclear projections in tumour cells and large chromosome markers

Summary The application of banding techniques on cytological smears from pleural effusion in a case of histiocytic sarcoma has provided direct evidence for correspondence between nuclear projections in tumor cells and extra large chromosome markers observed in the neoplastic karyotype obtained by direct preparations.     

Lipid droplet dynamics in budding yeast

Eukaryotic cells store excess fatty acids as neutral lipids, predominantly triacylglycerols and sterol esters, in organelles termed lipid droplets (LDs) that bulge out from the endoplasmic reticulum. LDs are highly dynamic and contribute to diverse cellular functions. The catabolism of the storage lipids within LDs is channeled to multiple metabolic pathways, providing molecules for energy production, membrane building blocks, and lipid signaling. LDs have been implicated in a number of protein degradation and pathogen infection processes. LDs may be linked to prevalent human metabolic diseases and have marked potential for biofuel production. The knowledge accumulated on LDs in recent years provides a foundation for diverse, and even unexpected, future research. This review focuses on recent advances in LD research, emphasizing the diverse physiological roles of LDs in the model system of budding yeast.