Are chromosome secondary constrictions nucleolar organizers?
نویسندگان
چکیده
منابع مشابه
Studies on nucleolar RNA synthesis in Drosophila melanogaster. I. The relationship between number of nucleolar organizers and rate of synthesis.
Nucleolar RNA synthesis in salivary glands from XX, XY, and XO larvae having different numbers of nucleolus organizers was examined autoradiographically following incubation of the tissues in [H]uridine. In addition, the presence or absence of secondary constrictions was monitored in neuroblast preparations using acridine orange staining. It was observed that: (1) The rate of nucleolar [H]uridi...
متن کاملRibosomal RNA cistron multiplicity and nucleolar organizers in hexaploid wheat.
The ribosomal DNA (DNA complementary to ribosomal RNA) content of twelve different wheat genotypes has been studied. Some of these genotypes are aneuploids with deletions or additions of chromosomes bearing nucleolar organisers. The rDNA contents of these genotypes provide several examples of a clear departure from a correlation between the number of rRNA cistrons and the number of nucleolar or...
متن کاملChromosomes and nucleoli of the axolotl, Ambystoma mexicanum.
Amongst the axolotl's haploid complement of fourteen mitotic chromosomes, one of the four largest, with a greater arm asymmetry than the other three, shows a nucleolar constriction subterminally in its shorter arm. Low-temperature treatment causes further secondary constrictions to appear; these constrictions enable most of the mitotic chromosomes to be identified; the constrictions occur at si...
متن کاملVowel constrictions are recoverable from formants
The area function of the vocal tract in all of its spatial detail is not directly computable from the speech signal. But is partial, yet phonetically distinctive, information about articulation recoverable from the acoustic signal that arrives at the listener's ear? The answer to this question is important for phonetics, because various theories of speech perception predict different answers. S...
متن کاملActin cytoskeleton: Are FH proteins local organizers?
The FH proteins, defined by the presence of 'formin homology' regions, are important for a number of actin-dependent processes, including polarized cell growth and cytokinesis. They are large, probably multi-domain, proteins and their function may be in part mediated by an interaction with profilin.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Experimental Cell Research
سال: 1971
ISSN: 0014-4827
DOI: 10.1016/0014-4827(71)90324-7