Morphometric analysis of macronuclei and macronuclear fragments in autogamous cultures of Paramecium aurelia

Acta histochemica
W KrawczyńskaA Przełecka

Abstract

The general pattern of ultrastructural organization of macronuclear fragments which appear during autogamous changes of the nuclear apparatus of Paramecium aurelia is similar to that observed in undisturbed macronuclei. Morphometric analysis of electron-micrographs reveals, however, that only the nucleolar relative surface area remains unchanged in macronuclear fragments as compared with macronuclei, this suggesting the same intensivity of rRNA synthesis in them. Moreover, there exists, between the relative surface area covered by heterochromatin and the nucleoli in macronuclear fragments, an inversely proportional, statistically significant correlation, different than that calculated for macronuclei. The relative surface area of heterochromatin in macronuclear fragments is smaller than in macronuclei, what may be a sign either of enhancement of chromatin activity or of proceeding nuclear lysis.

References

Jan 1, 1976·Comparative Biochemistry and Physiology. A, Comparative Physiology·M Aomine
Jan 1, 1968·Journal of Ultrastructure Research·J A Terzakis
Aug 1, 1974·Proceedings of the National Academy of Sciences of the United States of America·J G Gall
Oct 1, 1974·The Journal of Cell Biology·W SawickiJ Abramczuk
Apr 11, 1972·European Journal of Biochemistry·J Engberg, R E Pearlman
Feb 1, 1969·The Journal of protozoology·E D HansonM Kaneda
Aug 1, 1967·The Journal of protozoology·I Stevenson
Aug 1, 1969·The Journal of protozoology·A T Soldo, W J VAN WAGTENDONK
Mar 1, 1961·Experimental Cell Research·J WOODARDH SWIFT
Mar 1, 1962·Experimental Cell Research·J BERECH, W J VAN WAGTENDONK

Related Concepts

Cell Division Phases
Cell Nucleolus
Cell Nucleus
Heterochromatin
Paramecium

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.

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.

Systemic Juvenile Idiopathic Arthritis

Systemic juvenile idiopathic arthritis is a rare rheumatic disease that affects children. Symptoms include joint pain, but also fevers and skin rashes. Here is the latest on this disease.

Chromatin Regulation and Circadian Clocks

The circadian clock plays an important role in regulating transcriptional dynamics through changes in chromatin folding and remodelling. Discover the latest research on Chromatin Regulation and Circadian Clocks here.

Central Pontine Myelinolysis

Central Pontine Myelinolysis is a neurologic disorder caused most frequently by rapid correction of hyponatremia and is characterized by demyelination that affects the central portion of the base of the pons. Here is the latest research on this disease.

Myocardial Stunning

Myocardial stunning is a mechanical dysfunction that persists after reperfusion of previously ischemic tissue in the absence of irreversible damage including myocardial necrosis. Here is the latest research.

Pontocerebellar Hypoplasia

Pontocerebellar hypoplasias are a group of neurodegenerative autosomal recessive disorders with prenatal onset, atrophy or hypoplasia of the cerebellum, hypoplasia of the ventral pons, microcephaly, variable neocortical atrophy and severe mental and motor impairments. Here is the latest research on pontocerebellar hypoplasia.

Cell Atlas Along the Gut-Brain Axis

Profiling cells along the gut-brain axis at the single cell level will provide unique information for each cell type, a three-dimensional map of how cell types work together to form tissues, and insights into how changes in the map underlie health and disease of the GI system and its crosstalk with the brain. Disocver the latest research on single cell analysis of the gut-brain axis here.

Chronic Traumatic Encephalopathy

Chronic Traumatic Encephalopathy (CTE) is a progressive degenerative disease that occurs in individuals that suffer repetitive brain trauma. Discover the latest research on traumatic encephalopathy here.