Cytodifferentiation and vitellogenesis during oogenesis in arachnida: Cytological studies on developing oocytes of a harvestman

Journal of Morphology
R G Kessel, H W Beams

Abstract

Light and electron microscope studies were made on harvestman oocytes during the course of their origin, differentiation, and vitellogenesis. The germ cells appear to originate from the ovarian epithelium. They subsequently migrate to the outer surface of the epithelium, where they remain attached often by means of stalk cells which suspend them in the hemocoel during oogenesis. The "Balbiani bodies," "yolk nuclei," or "nuage" constitute a prominent feature of young, previtellogenic oocytes, and take the form of large, but variable sizes of electron-dense cytoplasmic aggregates with small fibrogranular components. The cytoplasmic aggregates fragment and disperse, and cannot be detected in vitellogenic oocytes. The young oocytes become surrounded by a vitelline envelope that appears to represent a secretory product of the oocyte. The previtellogenic oocytes are impermeable to horseradish peroxidase under both in vivo and in vitro conditions. In addition to mitochondria, dictyosomes, and abundant ribosomes, the ooplasm of the previtellogenic oocyte acquires both vesicular and lamellar forms of the rough-surfaced endoplasmic reticulum. In many areas, a dense homogeneous product appears within the cisternae of the endoplasmic retic...Continue Reading

References

Sep 1, 1978·Developmental Biology·G L WaringA P Mahowald
May 1, 1977·Cell·J R Warner, C Gorenstein
Jan 1, 1978·Acta Anatomica·K O Söderström, M Parvinen
Mar 1, 1979·The Journal of Cell Biology·M Parvinen, L M Parvinen
Jan 1, 1973·The American Journal of Anatomy·H W Beams, R G Kessel
Aug 1, 1969·Comparative Biochemistry and Physiology·Y Lensky, E Alumot
Feb 1, 1968·The Journal of Experimental Zoology·A P Mahowald
Oct 1, 1968·The Journal of Cell Biology·R G Kessel, W R Panje
Oct 1, 1968·Journal of Cellular Physiology·B K FollettM R Redshaw
Jan 1, 1968·Zeitschrift für Zellforschung und mikroskopische Anatomie·R G Kessel
Dec 1, 1968·The Journal of Cell Biology·R G Kessel, H W Beams
Feb 1, 1966·The Journal of Cell Biology·M J Droller, T F Roth
Apr 1, 1966·The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society·R C Graham, M J Karnovsky
Jan 1, 1966·Zeitschrift für Zellforschung und mikroskopische Anatomie·R G Kessel
Jul 25, 1956·The Journal of Biophysical and Biochemical Cytology·L ORNSTEIN
Jul 25, 1956·The Journal of Biophysical and Biochemical Cytology·E ANDERSON, H W BEAMS
Mar 25, 1957·The Journal of Biophysical and Biochemical Cytology·J R SOTELO, O TRUJILLO-CENOZ
Nov 25, 1957·The Journal of Biophysical and Biochemical Cytology·J ANDRE, C ROUILLER
Nov 1, 1960·Stain Technology·K C RICHARDSONE H FINKE
Apr 1, 1962·The Journal of Cell Biology·H W BEAMS, R KESSEL
Jan 1, 1964·The Journal of Cell Biology·E ANDERSON
Feb 1, 1964·The Journal of Cell Biology·T F ROTH, K R PORTER
Jul 25, 1969·Science·M L PanW H Telfer
Jan 1, 1969·Tissue & Cell·L M Anderson, W H Telfer

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.