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2. Notes on the ultrastructure of two myxosporean (Myxozoa) species, Zschokkella pleomorpha and Ortholinea fluviatilis

Creator:
Lom, Jiří and Dyková, Iva
Format:
print
Type:
model:internalpart and TEXT
Subject:
Myxosporea, ultrastructure, Zschokkella, and Ortholinea
Language:
English
Description:
Two myxosporean species, Zschokkella pleomorpha Lom et Dyková, 1995 (Zp) and Ortholinea fluviatilis Lom et Dyková, 1995 (Of) from the kidney of Tetraodon fluviatilis were studied by transmission electron microscope. Coelozoic sporogonie plasmodia of both species use pseudopodia-like projections for attachment to the epithelial cells of renal tubules. These projections either attach to host microvilli forming an interface reminiscent of septate junction (Zp) or are embedded into the epithelial cell surface (Of) or are inserted into gaps between epithelial cells (Zp, Of). Zp produces spores only by direct division of generative cells while in Of pansporoblasts prevail over direct division of generative cells. Sporogonie plasmodia of Zp greatly differ in size and in the variety of cytoplasmic constituents. A special feature in capsulogenesis is a transient envelope encasing the capsular primordium; there are fine fibres on the surface of the nascent filament spaced at 11 nm. In Of, vegetative nuclei of the plasmodium adhere to generative cells in a way reminding of sporoplasmic plasmodium of actinospores. In Of plasmodia, several unusual cytoplasmic structures were observed (membrane bound bodies with fuzzy radial contents or with a central dense inclusion, and endoplasmic reticulum cistemae forming a scalloped network). Of may also form intracellular coelozoic sporogonie plasmodia in the epithelial cells of renal tubules; these stages do not seem to constitute an important part of the life cycle.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. Sociokultúrna sonda do života súčasných seniorov

Creator:
Šipöczová, Eva
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
old age, traditional society, current society, grandparenthood, retirement, and seniors
Language:
Czech
Description:
The study is devoted to the old age as a specific period of life, conditioned culturally, politically, socially and economically and variable in history. On the basis of the status of the oldest members of a traditional family and the society the author points out changes in the life of seniors from the period of the industrial revolution to the present. The role of grandparents and retirement are perceived by the society and the state as two milestones changing the status of individuals within the family and within the population. On the other hand there is perception of self in the new life situation, personal experiencing the retirement age, life strategies and perception of aging in everyday life.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public