Results 191 to 200 of about 15,818 (212)

The regulation of euchromatin and heterochromatin by histones in yeast

Journal of Cell Science, 1995
ABSTRACT Yeast chromosomes may lack the linker histone Hl (normally required to compact 10 nm beads-on-a-string fiber into the 30 nm fiber) and there is no cytological evidence for higher order fiber structure but they do contain regions which correspond to euchromatin and heterochromatin of higher eukaryotes.
Grunstein, Michael, Hecht, Andreas, Fisher-Adams, G., Wan, J., Mann, R. K., Strahl-Bolsinger, Sabine, Laroche, Thierry, Gasser, S.   +7 more
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Reaction of human heterochromatin and euchromatin to spermine [PDF]

Bulletin of Experimental Biology and Medicine, 1975
The frequency of occurrence of cell nuclei with X-chromatin and Y-chromatin, as well as with diffuse and coarse chromatin network was studied, using cultured human fibroblasts 47XXY and 47XYY, after treatment of the cell with spermin. This treatment failed to change the percentage of the nuclei with the X- and Y-bodies, but significantly increased the ...
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Chromosome Structure: Euchromatin and Heterochromatin

1987
Publisher Summary This chapter discusses the terms “euchromatin” and “heterochromatin” that have long been familiar for expressing primarily the state of chromatin condensation during the cell cycle. The term “heterochromatin,” in particular, has been used to describe such chromatin or chromosome segments that did not go through the uncoiling process
Ram S. Verma, Arvind Babu
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Euchromatinization of mammalian nuclei

Medical Hypotheses, 2002
This paper discusses a mechanism for converting heterochromatin into the more relaxed state of euchromatin. Actuation of such state conversion stems from disassembly of internal vesicles that are incapable of surviving when trapped within the inner chamber of mammalian nuclei.
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Chromatin-associated RNA content of heterochromatin and euchromatin

Molecular and Cellular Biochemistry, 1975
Chromatin from TLT hepatoma cells, mouse liver cells, and mouse brain cells was fractionated by differential centrifugation into a pellet, enriched with heterochromatin, and a supernatant, enriched with euchromatin. The pellet was found to contain more than twice as much of a particular species of chromatin-associated RNA per milligram chromatin DNA as
Jacob D. Duerksen, Izhak J. Paul
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Interaction systems between heterochromatin and euchromatin inDrosophila melanogaster

Genetica, 1994
The constitutive heterochromatin is still one of the major unsolved problems in genetics. In Drosophila melanogaster three genetic systems involving specific interactions between heterochromatic and euchromatic genetic elements are known: the Segregation Distortion, the crystal-Stellate and the abo-ABO systems.
PALUMBO G., BERLOCO M., FANTI L., BOZZETTI, Maria Giuseppina, MASSARI, SERAFINA, CAIZZI R., CAGGESE C., SPINELLI L., PIMPINELLI S.   +8 more
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Chapter 11 Isolation of Mammalian Heterochromatin and Euchromatin

1974
Publisher Summary This chapter discusses the isolation of mammalian heterochromatin and euchromatin. One of the essential requirements for the isolation of relatively pure heterochromatin and euchromatin fractions from mammalian cells is the isolation of clean nuclei in which the architecture of the chromatin has not been significantly altered.
Jorge J. Yunis, Walid G. Yasmineh
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Replication of euchromatin and heterochromatin in a mealybug

Chromosoma, 1971
Asynchronous DNA replication of euchromatic (E) and heterochromatic (H) chromosomes and heterochromatic B chromosomes (B) were studied in the mealybug, Pseudococcus obscurus Essig (Homoptera: Coccoidea). The study was carried out on mycetocytes of adult females and on spermatocytes of mid-second instar males by employing tritiated thymidine labeling ...
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Is euchromatin really open in the cell?

Trends in Cell Biology
Genomic DNA is wrapped around a core histone octamer and forms a nucleosome. In higher eukaryotic cells, strings of nucleosomes are irregularly folded as chromatin domains that act as functional genome units. According to a typical textbook model, chromatin can be categorized into two types, euchromatin and heterochromatin, based on its degree of ...
Kazuhiro, Maeshima, Shiori, Iida, Masa A, Shimazoe, Sachiko, Tamura, Satoru, Ide   +4 more
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The Variable Condition of Euchromatin and Heterochromatin

1976
Publisher Summary This chapter discusses the variable condition of euchromatin and heterochromatin. Several terms were used to describe late-replicating chromosome material, replacing the customary term heterochromatin which was introduced by Heitz. The varying degree of condensation of meiotic chromosomes was called heteropycnosis.
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