Literature DB >> 342269

Circles in spermatocyte chromatin loops. Electron microscopy and AgAs-NORs studies.

M L Beçak, S M Carneiro, K Fukuda.   

Abstract

We describe the production of circles in chromomeric loops during the pachytene stage of the spermatocytes. These circles are found attached to chromatin or already free in the nucleoplasm. Each circle measures an average of 3700 A in circunference. We suggest that such circles might indicate the presence of tandem repetitions.

Mesh：

Substances：

Year:  1978        PMID： 342269     DOI： 10.1007/bf01944658

Source DB:  PubMed          Journal:  Experientia        ISSN： 0014-4754


  9 in total

1.  Further studies on polyploid amphibians. V. C-banding in diploid and tetraploid species of Odontophrynus.

Authors:  I R Ruiz; W Beçak
Journal:  Chromosoma       Date:  1976-01-27       Impact factor: 4.316

2.  Cyclodromes and palindromes in chromosomes.

Authors:  C A Thomas; R E Pyeritz; D A Wilson; B M Dancis; C S Lee; M D Bick; H L Huang; B H Zimm
Journal:  Cold Spring Harb Symp Quant Biol       Date:  1974

3.  The rolling helix: a model for the eukaryotic gene?

Authors:  C A Thomas
Journal:  Cold Spring Harb Symp Quant Biol       Date:  1974

4.  The amplification of ribosomal RNA genes involves a rolling circle intermediate.

Authors:  D Hourcade; D Dressler; J Wolfson
Journal:  Proc Natl Acad Sci U S A       Date:  1973-10       Impact factor: 11.205

5.  Visualization of nucleolar genes.

Authors:  O L Miller; B R Beatty
Journal:  Science       Date:  1969-05-23       Impact factor: 47.728

6.  Whole mount electron microscopy of fibril-rings in alkali-urea treated salivary gland chromosomes of Drosophila melanogaster.

Authors:  V Sorsa
Journal:  Hereditas       Date:  1973       Impact factor: 3.271

7.  Cyclization of eucaryotic deoxyribonucleic acid fragments.

Authors:  C A Thomas; B A Hamkalo; D N Misra; C S Lee
Journal:  J Mol Biol       Date:  1970-08       Impact factor: 5.469

8.  Cytological evidence of constant tetraploidy in the bisexual South American frog Odontophrynus americanus.

Authors:  M L Beçak; W Beçak; M N Rabello
Journal:  Chromosoma       Date:  1966       Impact factor: 4.316

9.  Human nucleolus organizers: the satellites or the stalks?

Authors:  C Goodpasture; S E Bloom; T C Hsu; F E Arrighi
Journal:  Am J Hum Genet       Date:  1976-11       Impact factor: 11.025
  9 in total
  1 in total

1.  Chromatin circles in amphibian provitellogenic oocytes.

Authors:  M L Beçak; K F Pizzocaro
Journal:  Experientia       Date:  1980-02-15
  1 in total

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