Biomaterial Database

[Cytophotometric studies of the nuclear cycle of Sphaeromyxa elegini]. 1975

A V Uspenskaia

The cytophotometric investigation of DNA content in the nuclei of Myxosporidia Sphaeromyxa elegini Dogiel 1948 was made. It was found that not only nuclei of sporoplasm but also capsulogenic nuclei are haploid. The fact makes us leave apart, as far as these species are concerned, the scheme of nucl eic cycle according to which all somatic nuclei are diploid. It seems possible that two nuclei of sporoplasm as well as two capsulogenic nuclei are the four products of two-step meiosis, but lacking the data on DNA content in valvogenic nuclei we cannot be sure of this. It spite of some peculiarities in the distribution according to DNA content it seems that sporoblasts nuclei cna be considered as diploid at all the stages investigated. The vegetative nuclei are polyploid (tetraploid as usual).

UI	MeSH Term	Description	Entries
D002467	Cell Nucleus	Within a eukaryotic cell, a membrane-limited body which contains chromosomes and one or more nucleoli (CELL NUCLEOLUS). The nuclear membrane consists of a double unit-type membrane which is perforated by a number of pores; the outermost membrane is continuous with the ENDOPLASMIC RETICULUM. A cell may contain more than one nucleus. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed)	Cell Nuclei,Nuclei, Cell,Nucleus, Cell
D002875	Chromosomes	In a prokaryotic cell or in the nucleus of a eukaryotic cell, a structure consisting of or containing DNA which carries the genetic information essential to the cell. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed)	Chromosome
D004247	DNA	A deoxyribonucleotide polymer that is the primary genetic material of all cells. Eukaryotic and prokaryotic organisms normally contain DNA in a double-stranded state, yet several important biological processes transiently involve single-stranded regions. DNA, which consists of a polysugar-phosphate backbone possessing projections of purines (adenine and guanine) and pyrimidines (thymine and cytosine), forms a double helix that is held together by hydrogen bonds between these purines and pyrimidines (adenine to thymine and guanine to cytosine).	DNA, Double-Stranded,Deoxyribonucleic Acid,ds-DNA,DNA, Double Stranded,Double-Stranded DNA,ds DNA
D006651	Histocytochemistry	Study of intracellular distribution of chemicals, reaction sites, enzymes, etc., by means of staining reactions, radioactive isotope uptake, selective metal distribution in electron microscopy, or other methods.	Cytochemistry
D016782	Apicomplexa	A phylum of unicellular parasitic EUKARYOTES characterized by the presence of complex apical organelles generally consisting of a conoid that aids in penetrating host cells, rhoptries that possibly secrete a proteolytic enzyme, and subpellicular microtubules that may be related to motility.	Sporozoa,Sporozoea,Apicomplexas,Sporozoas,Sporozoeas