scholarly journals LIFE HISTORY AND HABITS OF THE PIGEON LOUSE (COLUMBICOLA COLUMBAE [LINNAEUS[)

1934 ◽  
Vol 66 (1) ◽  
pp. 6-16 ◽  
Author(s):  
Margaret Martin
Keyword(s):  
Life History ◽  
Columba Livia ◽  
History Of ◽  
The Common

Very little work has been done on the life history or habits of Mallophaga. Only two papers have heen published since 1913 which give even a general discussion of the life history of these parasites. The number of instars through which the insects pass was not determined in either case. For the experiments reported in this paper, the pigeon louse (Columbicola columbae [Linnaeus]) was chosen because of the ease of obtaining and handling the common host, Columba livia Linn.

scholarly journals The life history of Hepatozoon leptodactyli (Lesage, 1908) Pessoa, 1970: a parasite of the common laboratory animal: the frog of the genus Leptodactylus

1973 ◽  
Vol 71 (1-2) ◽  
pp. 1-8 ◽  
Author(s):  
Sylvio Celso Goncalves da Costa ◽  
Samuel B. Pessoa ◽  
Neize de Moura Pereira ◽  
Tania Colombo
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Life History ◽  
Laboratory Animal ◽  
Peripheral Circulation ◽  
Experimental Conditions ◽  
History Of ◽  
The Central Nervous System ◽  
The Common ◽  
Common Laboratory

The main object of the present paper is to furnish a brief account to the knowledgement of Protozoa parasitic in common Brazilian frog of the genus Leptodactylus for general students in Zoology and for investigators that use this frog as a laboratory animal. Hepatozoon leptodactyli (Haemogregarina leptodactyli) was found in two species of frogs - Leptodactylus ocellatus and L. pentadactylus - in which develop schizogony whereas sporogony occurs in the leech Haementeria lutzi as was obtainded in experimental conditions. Intracellular forms have been found in peripheral circulation, chiefly in erythrocytes, but we have found them in leukocytes too. Tissue stages were found in frog, liver, lungs, spleen, gut, brain and heart. The occurence of hemogregarine in the Central Nervous System was recorded by Costa & al,(13) and Ball (2). Some cytochemical methods were employed in attempt to differentiate gametocytes from trophozoites in the peripheral blood and to characterize the cystic membrane as well. The speorogonic cycle was developed in only one specie of leech. A brief description of the parasite is given.

IX. On the life-history of spirillum

1878 ◽  
Vol 27 (185-189) ◽  
pp. 481-485
Keyword(s):  
Life History ◽  
Fresh Water ◽  
Physiological Laboratory ◽  
University College ◽  
History Of ◽  
The Common

Notwithstanding the numerous and fruitful researches which have been recently made into the life-history of Bacteria, our knowledge of the common and interesting curved and spiral forms— the Vibrio and Spirillum of Ehrenberg—has made little or no advance since his time, neither embryonic nor reproductive forms having ever been observed; while even the zooglœa phase, so characteristic of Bacterium and Bacillus, has only once been mentioned, and then in a different form. A fresh-water aquarium, which has been stagnating since last summer in the Physiological Laboratory of University College, con­tained in winter vast numbers of ordinary motile Spirillum. On recently re-examining the water, one zooglœa film after another having in the meantime formed on the surface, thickened, broken, and sunk, we found that these motile forms had almost disappeared, while the films consisted almost entirely of resting Spirillum in a gelatinous-looking matrix, similar to that of Bacterium and Bacillus . Among these were two or three apparently distinct kinds of filaments, some resting and colourless, others motile, and filled with highly refracting bright yellowish-brown spheres. Such a field is represented in fig. 1.

scholarly journals Winners and Losers of the Process of Transformation as an Etic Category versus Emic Biographical Perspective

2019 ◽  
Vol 15 (4) ◽  
pp. 238-266
Author(s):  
Kaja Kaźmierska
Keyword(s):  
Life History ◽  
Life Story ◽  
Social Reality ◽  
History Of ◽  
The Common ◽  
Emic Perspective ◽  
The Way

One of the common and schematic descriptions in the perspective of the 1989 breakthrough are two ways of dealing with it by people who are respectively called winners or losers of transformation. These stereotypical characteristics are not only the tool to draw the general image of effects of the transition, but are also based on the specific way of interpretation deeply rooted, for example, in neoliberal thinking. Yet, from the perspective of an individual—so-called Schütz’s man on the street—the categorization of winners and losers not only simplifies the description of social reality, but also it cannot be easily biographically justified because the etic categorization is not always relevant to the emic perspective. In other words, the life history of an individual, showing the main phases and events of biography, and life story—the way that one interprets his/her biographical experiences— may not correspond to each other. The analysis of these two aspects of biography (what is lived through and how it is interpreted) shows how people have dealt with the process of transformation. In the paper, it is presented on the basis of one case study.

A Contribution to the Life History of Echinostomum secundum, Nicoll

Parasitology ◽  
1908 ◽  
Vol 1 (4) ◽  
pp. 352-358 ◽  
Author(s):  
Marie V. Lebour
Keyword(s):  
Life History ◽  
Littorina Littorea ◽  
Bivalve Mollusks ◽  
Larval Form ◽  
Larval Trematode ◽  
Feeding Experiments ◽  
History Of ◽  
The Common ◽  
Young Worm ◽  
Marine Laboratory

In some notes on the Trematodes of Northumbria published in 1905 a few remarks were made on a larval Trematode inhabiting the liver of the common periwinkle Littorina littorea. The liver in two per cent. of the periwinkles from Budle Bay was full of rediæ containing cercariæ more or less developed, the latter agreeing in every way with an encysted Echinostomum larva which inhabits mussels, cockles and other bivalve mollusks in the same locality. So close was the resemblance that I had no hesitation in declaring them to be the same worm in different stages, but hoped for an opportunity of demonstrating this by experiment. In October 1908 through the courtesy of Professor Meek I had the opportunity of conducting some feeding experiments in the Dove Marine Laboratory, Cullercoats, which have given satisfactory results, and although it is not possible to state absolutely that the forms are identical yet the evidence is so strong that I think I am justified in regarding the young worm in the periwinkle as an earlier larval form of the encysted worm in the foot of the mussel and cockle.

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