The present study investigated the expression of androgen receptor (AR) in neurons of the anterior pelvic ganglion (APG) and celiac-superior mesenteric ganglion (CSMG; ganglion not involved in the innervation of reproductive organs) in the male pig with quantitative real-time PCR (qPCR) and immunohistochemistry. qPCR investigations revealed that the level of AR gene expression in the APG tissue was approximately 2.5 times higher in the adult (180-day-old) than in the juvenile (7-day-old) boars. Furthermore, in both the adult and juvenile animals it was sig- nificantly higher in the APG than in CSMG tissue (42 and 85 times higher, respectively). Immu- nofluorescence results fully confirmed those obtained with qPCR. In the adult boars, nearly all adrenergic (DβH-positive) and the majority of non-adrenergic neurons in APG stained for AR. In the juvenile animals, about half of the adrenergic and non-adrenergic neurons were AR-posi- tive. In both the adult and juvenile animals, only solitary CSMG neurons stained for AR. The present results suggest that in the male pig, pelvic neurons should be considered as an element of highly testosterone-dependent autonomic circuits involved in the regulation of urogenital func- tion, and that their sensitization to androgens is a dynamic process, increasing during the prepu- bertal period.
European beaver (Castor fiber), the largest rodent species inhabiting a wide area of Eurasia, feeds mainly on dry parts of plants, bark or wood. Such kind of nourishment needs to be properly digested in each part of the gastrointestinal tract. The time of stomach digestion, which directly influences all the following steps of the digestion process, is precisely controlled by the pylorus and its innervation. However, virtually no data is available on the organization of the enteric nervous system in most of the wild animal species, including beavers. On the other hand, a pecu- liar diet consumed by beavers, suggests that the arrangement of their stomach intramural nerve elements can be atypical. Therefore, the present study investigated the distribution and chemical coding of neurons and nerve fibers in the pylorus of the European beaver.
The experiment was performed on stomachs obtained from a group of 6 beavers caught in Northeastern region of Poland (due to beaver overpopulation). Pyloric wall tissue cryosections were double immunostained with a mixture of antibodies against pan-neuronal marker PGP 9.5 (to visualize enteric neurons) and ChAT (cholinergic marker), nNOS (nitrergic marker), SP, CGRP, Gal (peptidergic markers).
Confocal microscopy analysis revealed that the majority of enteric nerve cells were clustered forming submucosal and myenteric ganglia and all the studied substances were expressed (in various amounts) in these neurons.
We conclude, that the anatomical arrangement and chemical coding of intramural nerve elements in the beaver pylorus resemble those found in other mammalian species.
This article examines the analogies, and more specifically the historical 'theatre of the imagination', between Tytus Czyżewski's Robespierre/Rhapsody (1927) and Stanisław Wyspiański's poetic dramas Rhapsodies (Kazimierz the Great and Bolesław the Bold). Each of those poems foregrounds its principal historical character. Wyspiański's dramatic poems, commonly known as Rhapsodies, focus on Kazimierz the Great, Bolesław the Bold, and Piast. kings of pivotal significance in his vision of Poland's historical destiny. Twenty years later Tytus Czyżewski, an acclaimed avant-garde painter and poet, composed a poetic-essayistic salmagundi, in which he sought to render in a similarly elevated style and condensed dialogue the drama of the leaders of the French Revolution, Robespierre and Danton. While Robespierre has to face, apart from some common people, God, the Spirit and Judges that sit in judgment on him, the final section of Rhapsody evokes Juliusz Słowacki. A monologue, mimicking his lofty verse, establishes a metaphorical common thread in Polish history – from the days of mail-clad knights to the wretched everyday life in the trenches – set against a broad background of wars, destruction and the French Revolution. For Czyżewski the French Revolution was a ground-breaking event, the first act of a great historical process that ushered in the Modern Age with its ideas of progress, reason, freedom, social justice, the elimination of poverty. It continues to inspire mankind with the hope that even a most ambitious change is possible. For Wyspiański, on the other hand, the grand project of human emancipation does give rise to doubts whether a wholesale obliteration of the Old is justified and to questions about God, free will, theodicy and destiny, and the 'tyranny of reason'. The differences between the two philosophies of history – Wyspiański's, from the turn of the 19th century, and Czyżewski's, representative of the artistic and intellectual climate of the late 1920s – are no doubt profound, and yet, what both of them seem to share is a deep concern with the relevance of history for the present and for designing the future.
The presented paper concerns a novel concept of hybrid piezoelectric motor based on electroactive lubrication principle. Its structure is combined of quasi-static and resonance piezoelectric actuators, synchronizing their work to generate the rotary movement. The hybrid motor topology is compared to the existing piezoelectric motors, regarding its field of applications in embedded systems with very high security requirements. The electroactive lubrication principle is briefly presented with regards to optimization of the hybrid motor. The performance principle of the hybrid motor is described in terms of its working cycle. The assembling process of the prototype hybrid motor is briefly explained with emphasis put on the frequency and impedance tuning of the applied quasi-static and resonance piezoelectric actuators. Next, the hybrid motor power supply system is described and chosen measured performance characteristics are presented. Finally, conclusions concerning the features of the tested prototype hybrid motor and possible solutions of the faced issues, during assembling and testing, are presented.