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Literature DB >> 13438896

The fine structure of nuclei during sperm maturation in the locust.

Abstract

1. In the heads of maturing sperm of a locust the chromatin becomes arranged in a highly regular manner so as to produce many parallel lines about 60 A thick in longitudinal section and contiguous polygons in transverse section. 2. This configuration appears after fixation in osmium tetroxide, formaldehyde, or acetic acid; intermediate stages in its development are illustrated. 3. These electron micrographs are interpreted to mean that, during sperm maturation, the chromatin becomes formed into sheets and then into tubes running parallel with the long axis. 4. In the mature sperm head we have been unable so far to detect this structure. This may be because the chromatin becomes so compact during the shrinkage of the nucleus which occurs during formation of the mature sperm.

Entities: Chemical

Keywords: CELL NUCLEUS; SPERMATOZOA

Mesh：

Substances：
Chromatin

Year: 1957 PMID： 13438896 PMCID： PMC2224076 DOI： 10.1083/jcb.3.2.133

Source DB: PubMed Journal: J Biophys Biochem Cytol ISSN： 0095-9901

7 in total

1. [Ultrastructure of chromosomes and their evolution during the spermiogenesis of the snail Helix pomatia. I. The spermatid; new concept of the chromosome structure].

Authors: P P GRASSE; N CARASSO; P FAVARD
Journal: C R Hebd Seances Acad Sci Date: 1956-02-20

13 in total

6. Spermatogenesis in animals as revealed by electron microscopy. VI. Researches on the spermatozoon-dimorphism in a pond snail, Cipango-paludina malleata.

Authors: G YASUZUMI; H TANAKA
Journal: J Biophys Biochem Cytol Date: 1958-09-25

The fine structure of nuclei during sperm maturation in the locust.

1. [Ultrastructure of chromosomes and their evolution during the spermiogenesis of the snail Helix pomatia. I. The spermatid; new concept of the chromosome structure].

2. [The ultrastructure of the chromosome and its evolution during spermiogenesis of Helix pomatia. II. The spermatozoa].

3. [Ultrastructure of the para-nuclear body, mitochondria and nuclear membrane of gametes of Allomyces macrogynus].

4. The fixation of cell nuclei by osmium tetroxide.

5. Chromosomal structures in crayfish spermatocytes.

6. An electron microscope study of spermatid differentiation in the toad, Bufo arenarum Hensel.

7. Observations on the fine structure of the macronucleus of Tokophrya infusionum.

1. [Electron microscopic findings in normal and pathological nerve cell nuclei].

2. [Development of the chromatin structures in the nurse cells of the oocytes in Drosophila melanogaster Meigen].

3. Chromatin condensation involving lamellar strands in spermiogenesis of Goniobasis proxima.

4. Chromosome fibers studied by a spreading technique.

5. [The fine structure of the spermatozoid of Sphaeroc arpos donnellii Aust. (Hepaticae)].

6. Spermatogenesis in animals as revealed by electron microscopy. VI. Researches on the spermatozoon-dimorphism in a pond snail, Cipango-paludina malleata.

7. The orientation of DNA within 80-Angstrom chromatin fibers.

8. A quantitative estimation of the uptake of two new electron stains by the cytoplasmic membrane of ram sperm.

9. Spermiogenesis in the crayfish (Procambarus clarkii). I. Structural characterization of the mature sperm.

10. The spermatid nucleus in two species of grasshopper.