The monotypic Protorhinoxenus gen. n. is proposed to accommodate a species with the following characteristics: 1) tubular sclerotised vagina, 2) vaginal pore dextrolateral, 3) ventral and dorsal anchors with undifferentiated elongate shaft and base (representing approximately 2/3 of the length of anchor), and 4) superficial and deep roots of ventral and dorsal anchors lacking. Protorhinoxenus prochilodi sp. n. is described from the gills of Prochilodus lineatus (Valenciennes) of the Represa Capivari-Cachoeira, Municipality of Campina Grande do Sul, metropolitan area of Curitiba, Paraná. Specimens of other probable new species of Protorhinoxenus are reported from Prochilodus lineatus of the Rio Paranapanema, Municipality of Salto Grande, São Paulo; Hoplias spp. of the Rio Dois de Fevereiro, Municipality of Antonina, Paraná, and the Rio Piraquara, metropolitan area of Curitiba, Paraná; Leporinus elongatus Valenciennes of the Rio Tibagi, Municipality of Jataizinho, Paraná; and Schizodon fasciatum Agassiz of the Rio Solimões, island of Marchantaria, near Manaus, Amazonas. Protorhinoxenus appears to be a sister group of Rhinoxenus Kritsky, Boeger et Thatcher, 1988 based on the following apparent synapomorphies: 1) ventral and dorsal anchors lacking superficial and deep roots, 2) ventral and dorsal anchors with elongate shaft, and 3) male copulatory organ with counterclockwise rings.
Morphometric analyses are used to evaluate the taxonomic status of two sympatric variants of Gyrodactylus anisopharynx Popazoglo et Boeger, 2000 (forma ''large-pharynx'' and forma ''small-pharynx''). The parasites were collected from the Piraquara River and the Miringuava River, State of Paraná, Brazil, between February 2005 and May 2006. A total of 132 parasites were measured from two hosts, Corydoras ehrhardti Steindachner and Corydoras paleatus (Jenyns). Eleven morphological features of the haptoral sclerites and pharynx were measured and analysed by discriminant analysis and principal components analysis. The results indicate that the observed morphological variation cannot be associated to intraspecific variation or phenotypic plasticity (P < 0.0001). Consequently, the two variants previously allocated in G. anisopharynx represent two independent species. Since the holotype was defined as the variant ''large-pharynx'', Gyrodactylus corydori sp. n. is proposed to accommodate specimens previously reported as ''small-pharynx'' variant of G. anisopharynx. Morphometric analyses showed that the hook, the anchor, and the pharyngeal bulb are significantly distinct (P < 0.0001) between G. corydori sp. n. and G. anisopharynx (s.s.). The new species is characterized by having hooks with point moderately curved, robust convex heel, convex shelf, toe concave moderately pointed with depression; deep bar with two submedial, posterior projections; anchors with robust superficial root; superficial bar with two small anterolateral projections; and male copulatory organ armed with two rows of spinelets.
Anacanthorus franciscanus sp. n. and Anacanthorus brevicirrus sp. n. (Dactylogyridae) are described from the gills of the matrinchã, Brycon orthotaenia Günther (Characidae), from the Rio São Francisco in Brazil. Anacanthorus franciscanus most closely resembles Anacanthorus elegans and A. kruidenieri from the matrinchão, Brycon melanopterus, of the Amazon River Basin. It differs from these species in part by having the bulbous proximal end of the hook shank with two translucent regions. Anacanthorus brevicirrus resembles A. franciscanus, A. kruidenieri and A. elegans but is differentiated from these species by its short straight male copulatory organ and by having one translucent region in the bulbous base of the hook shank.
Based on molecular markers (COII and ITS1-ITS2) and morphological data, we describe three new Neotropical species of Gyrodactylus von Nordmann, 1832 from Scleromystax barbatus (Quoy et Gaimard) and Scleromystax macropterus (Regan) from southern Brazil. The three new species can be distinguished from each other by sequences of both molecular markers and morphology of hooks and anchors. Gyrodactylus bueni sp. n. is characterised by having hook with shaft curved, heel straight, shelf straight, toe pointed, anchor with superficial root slender, elongate and male copulatory organ armed with two rows of spinelets. Gyrodactylus major sp. n. presents hook with shaft, point curved, proximal shaft straight, heel convex, shelf convex, toe concave, anchor with superficial root robust and male copulatory organ armed with two rows of spinelets. Gyrodactylus scleromystaci sp. n. presents hook with shaft, point recurved, heel convex, shelf convex, toe pointed, anchor with superficial root curved and male copulatory organ armed with two rows of spinelets. These species appear to be closely related to other species of Gyrodactylus known from other species of Callichthyidae. These new species, however, differ by the comparative morphology of the haptoral hard structures and molecular data. Comparative analysis of sequences from these species of Gyrodactylus suggests that the COII gene may represent an important marker for the taxonomy of species of Gyrodactylidae and, perhaps, for species of other lineages of Monogenoidea.
The paper deals with the branch of imaging optics based on diffraction, and a special attention is concentrated on diffraction elements, which are not restricted on the paraxial space. The analysis is related first of all to distribution of rings on the element. Discussed are both plane and particularly spherical substrates of elements. The elements can not be designed for the object in infinity and therefore the image at the focusing distance only as it is in the original configuration, but for the axial object and image points in finite distances as well. The most general example of the element on the spherical substrate and design points in finite distances is an extend of the author’s previous paper published in a foreign journal. and Článek se zabývá oborem zobrazovací optiky založené na difrakci, zvláštní pozornost je věnována difrakčním prvkům, které se neomezují na paraxiální prostor. Analýza se týká především rozložení kroužků na prvku. Jsou diskutovány jak rovinné podložky prvků, tak zejména podložky kulové. Tyto prvky nemusejí být navrhovány pouze na předmět v nekonečnu, a tedy obraz v ohniskové rovině, jak je tomu u výchozí konfigurace, ale na osový předmětový i obrazový bod v konečných vzdálenostech. Nejobecnější případ prvku na kulové podložce a návrhových bodů v konečných vzdálenostech je rozšířením autorovy dřívější práce v zahraničním časopisu.
The endothelin (ET) and prorenin/renin/prorenin receptor (PRR) systems have opposing physiological effects on collecting duct (CD) salt and water reabsorption. It is unknown if the CD ET and renin/PRR systems interact, hence we examined the effects of deleting CD renin or nephron PRR on CD ET system components. PRR knockout (KO) mice were polyuric and had markedly increased urinary ET-1 and inner medullary CD (IMCD) ET-1 mRNA. PRR KO mice had greatly increased IMCD ETA receptor mRNA and protein, while ETB mRNA and protein were decreased. Water loaded wild-type mice with similar polyuria as PRR KO mice had modestly increased urinary ET-1 excretion and inner medullary ET-1 mRNA, while inner medullary ETA and ETB mRNA or protein expression were unaffected. In contrast to PRR KO, CD prorenin/renin KO did not alter ET system components. Taken together, these results suggest that the nephron PRR is involved in regulating CD ET system expression, but this effect may be independent of CD-derived renin., N. Ramkumar, D. Stuart, N. Abraham, D. E. Kohan., and Seznam literatury
L´article passe en revue les reformes de la langue lusacienne à partir d´une grande codification haute sorabe en 1948. Elle et celle basse sorabe der 1952 furent provoquées par le besoin de rapprocher les deux variantes littéraires et c´était un régime rigide qui facilita leur réalisation. Il n´est pas exact d´appeler ces modifications orthographiques, parce qu´elles, en majorité, partent du plan phonologique. Depuis les années cinquante des prescriptions grammaticales basses sorabes apparaissent moins stable que celles en Haute-Lusace. La sensibilité de la codification devient d´autant plus importante que beacoup de Sorabes sont réduits à apprendre leur langue natale à l´aide de manuels.
Work-life balance is a popular topic both in European and gradually also Czech sociology and in European strategies for employment and for dealing with population ageing. The article explores the topic of work-life balance from a theoretical perspective, in the context of contemporary European and world sociology, and from an empirical perspective, on the basis of a representative sociological survey of a population of parents conducted in 2005. The hypothesis of the pressure people experience to combine work and a family and gendered culture (Van der Lippe, Jager, Kops 2006), which puts the Czech Republic in the ranks of not very progressive countries in terms of gender equality, is verified in this survey, because, even though the majority of parents claimed that they are able to combine work and a family, there are nonetheless clear structural obstacles stemming from the design of public policies and institutions, which obstruct this balance. The Czech labour market is not parent or family-friendly, and parenthood (especially motherhood) is a handicap in the Czech labour market. Work-life balance is not the subject of any public or political discussion, and consequently Czech parents do not usually have a comprehensive view of the problem and regard it as serious. Mothers and fathers know that combining work and family is the reality of their lives and at the same time a private problem that they try to solve by means of various strategies.