Fine structure of the adrenocortical homologue in the north American eel and modifications following seawater adaptation

1979 ◽  
Vol 193 (2) ◽  
pp. 213-231 ◽  
Author(s):  
Tapan Kumar Bhattacharyya ◽  
David Gordon Butler
Keyword(s):  
Fine Structure ◽  
North American ◽  
American Eel ◽  
Seawater Adaptation ◽  
The North

The fine structure of sporogony in Myxidium zealandicum (Protozoa: Myxosporidia)

1977 ◽  
Vol 55 (2) ◽  
pp. 438-447 ◽  
Author(s):  
W. C. Hulbert ◽  
M. P. Komourdjian ◽  
T. W. Moon ◽  
J. C. Fenwick
Keyword(s):  
Fine Structure ◽  
Germ Cell ◽  
North American ◽  
Polar Capsule ◽  
Anguilla Rostrata ◽  
Transport Function ◽  
American Eel ◽  
The North ◽  
Spherical Structures ◽  
Asynchronous Maturation

Studies of the ultrastructure of the trophozoite (plasmodium) and the process of sporogony and polar capsule development of Myxidium zealandicum from gill and kidney of the North American eel Anguilla rostrata are described. Although the basic steps and characteristics of sporogony are similar to those previously reported for other myxosporidians, we report three new and significant observations in this study: (1) the identification of a uninucleate germ cell for the binucleate sporocyst; (2) the asynchronous maturation of polar capsules within a single sporocyst; and (3) the existence of a mitochondrial layer at the periphery of the Plasmodium that may have a transport function. We also observed cylindrical and spherical structures, either of which might be the primordium of the polar capsule, but we were unable to resolve this problem. These observations are discussed with reference to previous descriptions of myxosporidians.

Description and first occurrence of Myxidium zealandicum (Protozoa: Myxosporidia) in the North American eel Anguilla rostrata LeSueur

1977 ◽  
Vol 55 (1) ◽  
pp. 52-59 ◽  
Author(s):  
M. P. Komourdjian ◽  
W. C. Hulbert ◽  
J. C. Fenwick ◽  
T. W. Moon
Keyword(s):  
North American ◽  
Kidney Tissue ◽  
Quebec City ◽  
Anguilla Rostrata ◽  
Fast Green ◽  
American Eel ◽  
The North ◽  
First Occurrence ◽  
Scanning Electron ◽  
St Lawrence River

Myxidium zealandicum Hine, 1975 is described from gills and kidney of the North American eel Anguilla rostrata collected from the St. Lawrence River near Quebec City and Cornwall. Cysts of M. zealandicum on gills measured up to 1 by 2 mm and in kidneys up to 15 by 20 mm. In addition to single spherical cysts, several polymorphous forms were also observed on the gills. Polymorphous cysts were not found in the kidney. Different stages of spore development were evident in gill cysts and were differentiated by means of a lead hematoxylin – fast green stain. Number and pattern of spore striations were examined by scanning electron microscopy and were highly variable. The invasion of the parasite into kidney tissue appeared to result in less physiological damage to the host than did gill invasion. The existence of this parasite, previously found in eel species in New Zealand, in a North American eel species is discussed.

Ultrastructural study of the adrenocortical homologue in freshwater and seawater adapted eels

1978 ◽  
Vol 36 (2) ◽  
pp. 586-587
Author(s):  
Tapan Kumar Bhattacharyya ◽  
David Gordon Butler
Keyword(s):  
Fine Structure ◽  
Experimental Studies ◽  
Mature Female ◽  
American Eel ◽  
Endocrine Organ ◽  
The North ◽  
Metabolic Role ◽  
Silver Eels ◽  
Cacodylate Buffer

The teleost fishes have been extensively utilized to explore the biochemical nature of adrenocortical steroids, pathways of steroidogenesis and the metabolic role of adrenocortical steroids. The adrenocortical homologue (AH) has been localized in more than two hundred species of teleosts, although the fine structure of teleost AH has been studied only in the goldfish. It seemed to be of interest to investigate the normal fine structure of this endocrine organ in another zoologically important teleost species, the north American eel (Anguilla rostrata) as a baseline for experimental studies. This animal being a euryhaline species, the AH ultrastructure of animals exposed to artificial seawater for a long period (1 1/2 years) was also examined.Mature female silver eels held in freshwater(FW) and seawater(SW) aquaria were anesthetized and perfused with glutaraldehyde in phosphate buffer or formaldehyde-glutaraldehyde in cacodylate buffer, and glutaraldehyde containing 0. 2% digitonin for demonstration of cholesterol.

1588: The Bicalutamide Early Prostate Cancer Program: Findings of the North American Trial at 7.7 Years' Median Follow-Up

2006 ◽  
Vol 175 (4S) ◽  
pp. 511-512
Author(s):  
David G. McLeod ◽  
Ira Klimberg ◽  
Donald Gleason ◽  
Gerald Chodak ◽  
Thomas Morris ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
North American ◽  
Early Prostate Cancer ◽  
The North ◽  
Cancer Program
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