scholarly journals Screening of Immunocompetent Coelomic Cells in Earthworms

2016 ◽  
Vol 2 (04) ◽  
pp. 43-51 ◽  
Author(s):  
Shweta yadav
Keyword(s):  
Coelomic Cells

Oxygen binding of erythrocruorin and coelomic cell haemoglobin from the terebellid polychaete Neoamphitrite figulus related to some environmental factors

1982 ◽  
Vol 62 (2) ◽  
pp. 373-384 ◽  
Author(s):  
Rufus M. G. Wells ◽  
Lynda M. Warren
Keyword(s):  
Haemoglobin Concentration ◽  
Log P ◽  
Oxygen Binding ◽  
Transfer System ◽  
Equilibrium Curve ◽  
High Affinity ◽  
Coelomic Cells ◽  
Hyperbolic Equilibrium ◽  
Oxygen Equilibrium Curve

Measurements of pH, oxygen content, O2-combining capacity, and haemoglobin concentration were made for the vascular blood of the burrowing polychaete Neoamphitrite figulus in order to assess the role of its two respiratory pigments in respiration. The oxygen equilibrium curve of the erythrocruorin (extracellular haemoglobin) in the vessels was sigmoidal, having an n50 value of 1·5 and a low affinity for oxygen as determined by the P50 which was 26 mmHg at pH 7·31 and 18 °C. O2-binding by the erythrocruorin is sensitive to changes in pH (Δ log P50/Δ log pH = –0·24 to –0·29). The coelomic cell haemoglobin has a hyperbolic equilibrium curve (n50 = 1·0) and a high affinity for oxygen (P50 = 4·5 mmHg) independent of pH, suggesting an oxygen transfer system from the erythrocruorin to the coelomic cells.

Adenylate compartmentation and storage in coelomic cells of the polychaete Nereis virens

1995 ◽  
Vol 198 (10) ◽  
pp. 2079-2085
Author(s):  
U Hoeger ◽  
J F Dunn ◽  
C Märker
Keyword(s):  
Cell Volume ◽  
Packed Cell Volume ◽  
Adenine Nucleotides ◽  
Nmr Studies ◽  
Nereis Virens ◽  
In Vivo Nmr ◽  
Coelomic Cells ◽  
Small Pool ◽  
High Concentrations

The concentrations of adenine nucleotides (AMP, ADP, ATP) were determined in coelomic cells (eleocytes) of the polychaete Nereis virens. In cells of immature and male animals, total ADP and AMP contents (each 10­15 µmol ml-1 packed cell volume) greatly exceeded that of ATP (0.8 µmol ml-1 packed cell volume). 31P-nuclear magnetic resonance (NMR) studies of living eleocytes showed that the high concentrations of both AMP and ADP are free in solution. Comparisons of in vivo NMR spectra with those obtained from metabolite extracts of eleocytes suggest that the adenylate pools are compartmentalized, with a large pool being in an environment with a pH<6.0 and a small pool being in a domain where pH>6.7. This indicates that eleocytes are capable of storing high concentrations of ADP and AMP without inhibiting energy metabolism by sequestering these compounds into an acidic compartment. The large acidic vacuole characteristic of eleocytes may function as this compartment.

The Coelomic and Peritoneal Cell Systems of some Sabellid Polychaetes

1961 ◽  
Vol s3-102 (59) ◽  
pp. 327-346
Author(s):  
R. PHILLIPS DALES
Keyword(s):  
Direct Contact ◽  
Vascular System ◽  
Peritoneal Cell ◽  
Cell Systems ◽  
Qualitative And Quantitative ◽  
Coelomic Cells

The growth and activity of the coelomic cells of Sabella spallanzanii are described. Qualitative and quantitative determinations were made throughout the year of the glycogen, oil, and pigments which they contain. The coelomic cells accumulate carotenoids, including astaxanthin. The possibility of the interconversion of glycogen and oil by the cells is discussed, and it is concluded that the coelomic cells constitute a depot for the maturation of the gametes. This system is paralleled in some other sabellids by the development of a villous peritoneum. Such tissues contrast with the chloragogen tissue in that they have no direct contact with the blood vascular system.

On the diverse colours of Nereis diversicolor

1954 ◽  
Vol 33 (3) ◽  
pp. 699-708 ◽  
Author(s):  
R. Phillips Dales ◽  
G. Y. Kennedy
Keyword(s):  
Body Wall ◽  
Dorsal Side ◽  
The Body ◽  
Epithelial Tissue ◽  
Nereis Diversicolor ◽  
Green Colour ◽  
Coelomic Cells ◽  
Complete Extraction

SummaryThe variable colour of Nereis diversicolor is due to variations in the proportion of green, orange and brown pigments. The orange and brown pigments are mainly carotenoids; the green colour is due to biliverdin.Phaeophorbide-a and coproporphyrin III also occur, but both these pigments may be restricted to the gut wall; biliverdin occurs both in the wall of the gut, and in the epidermis and coelomic cells.The biliverdin is formed by the breakdown of the haemoglobin of the blood.Haemoglobin-breakdown takes place in the epidermis on the dorsal side of the body, in the epithelial tissue surrounding the proboscis and in the pygidium. Granules of biliverdin are probably removed by the coelomic cells and conveyed to the gut into which they are excreted.In ripe males, and in females during and after spawning, phagocytosis of the tissues is accompanied by an increased haemoglobin-breakdown with a corresponding accumulation of biliverdin in the body. The green appearance is due not only to an increased amount of biliverdin, but also to a complete extraction of carotenoids from the body-wall.

Survival of Anaerobic Periods By Two Intertidal Polychaetes, Arenicola Marina (L.) and Owenia Fusiformis Delle Chiaje

1958 ◽  
Vol 37 (2) ◽  
pp. 521-529 ◽  
Author(s):  
R. Phillips Dales
Keyword(s):  
Oil Content ◽  
Body Wall ◽  
Normal Activity ◽  
The Body ◽  
Oxygen Debt ◽  
Anaerobic Conditions ◽  
Arenicola Marina ◽  
Coelomic Cells ◽  
Lactate And Pyruvate ◽  
Glycogen Breakdown

Measurements of glycogen in the body wall of Arenicola indicate that glycogen is consumed during anaerobic conditions. Estimations of lactate and pyruvate show that neither is accumulated, accounting for the absence of an oxygen debt previously found by other workers, and suggesting that glycogen breakdown leads to other acids. In Owenia most of the glycogen is stored in coelomic cells and these deposits are not drawn upon during anaerobic periods, yet this species can survive long periods without oxygen, apparently by becoming quiescent. Oil content in both species has also been measured, and was found not to fall under anaerobic conditions. It is suggested that survival of anaerobic periods may be mainly due to an ability to suspend normal activity.

Sign in / Sign up

Export Citation Format

Share Document