Recent electron microscope studies of nuclei and chromosomes have shown that a
microfibril from 100 to 200 A thick is the basic morphological unit of chromosomes …

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 …

The nuclear changes accompanying spermatid elongation have been studied in two species
of grasshopper, Dissosteira carolina and Melanoplus femur-rubrum. Testes were fixed in 1 …

Recently, workers using the electron microscope have obtained visual evidence of physical
changes which occur in nuclei during sperniiogenesis. Grass6 et al.('56) first presented …

Thin sections of the testicular follicles of the grasshopper Laplatacris dispar were studied
under the electron microscope. In the primary spermatocytes, during meiotic prophase, three …

The mature sperms of many insects, including the grasshopper (Orthoptera), are very much
elongated, needle-like structures. The sperm nucleus is likewise extremely elongated with a …

The early stages of nuclear differentiation in spermatids of the house cricket are described
with regard to the fine structural elements and chemical components which occur. Particular …

Sperm from Nucella lapillus and Gallus domesticus were treated with the enzymes pronase
and trypsin and 8M urea to break down the nuclei. Preparations were dried by the critical …

The submicroscopic structure of the maturing spermatid nucleus of the grasshopper,
Gelastorrhinus bicoler de Haan, has been studied in thin tissue sections by electron …

IT IS an accepted premise that the chromosomes present a characteristic number and form
in the cells of an organism It is perhaps not surprising that, associated with this …