Czech Mature

The fine structure of the mature spermatozoon of the tapeworm Electrotaenia malopteruri (Fritsch, 1886), a member of a supposedly primitive group of proteocephalidean tapeworms (Proteocephalidae: Gangesiinae), was studied by transmission electron microscopy for the first time. The mature spermatozoon of E. malopteruri is filiform, tapers at both extremities, and contains two axonemes of 9+"1" trepaxonematan type. A helicoidal crested body (60-150 nm thick) is present at the anterior extremity of the gamete. The twisting cortical microtubules (CM) line the periphery of the spermatozoon continuously. The nucleus, a fine cord of moderately condensed chromatin, occupies the middle part (region III) of the spermatozoon. The slightly electron-dense cytoplasm contains electron-dense granules in regions II and III and becomes more electron-dense at the end of region IV. The anterior and posterior extremities of the spermatozoon contain a single axoneme. Two modes of disorganisation of the axoneme at the posterior end of the mature spermatozoa are described for the first time in cestodes. The present data also indicate that the sperm ultrastructure of E. malapteruri shows some characters typical for onchobothriid tetraphyllideans, but it resembles that of Cyclophyllidea in the arrangement of twisting of the CM.

czech mature

QUESTION (Czech TV): I have two questions. The first is if you can say if enlargement is going to be more like Big Bang or just enlargement for two or three members? And the second question is about the new members: the Czech Republic, Poland, and Hungary have ten years for obtaining what you call mature capability. Do you think the new members will have the same time?

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Development of the male gametophyte is a critical phase in the process of sexual reproduction in flowering plants. This developmental pathway proceeds through a complex sequence of events that include polarization, nuclear migration, asymmetrical mitosis, growth and differentiation. In the past few years, some of the signals and mechanisms that modulate pollen development have begun to be identified. A key role for actin cytoskeletal arrays has been documented. This review aims to summarize and supplement the current understanding of actin cytoskeletal stucture and function during the differentiation of microspores to mature pollen. 041b061a72