Search

Start Over Rights http://creativecommons.org/licenses/by-nc-sa/4.0/ Date Unknown

1673. Ammonia as a pheromone in anuran tadpoles

Creator:
Manteifel, Y. B. and Kiseleva, E. I.
Format:
print
Type:
article, články, model:article, and TEXT
Subject:
Fyziologie člověka a srovnávací fyziologie, amoniak, obojživelníci, housenice, ammonia, amphibians, larvae, disturbance pheromone, sensitivity, 14, and 612
Language:
English
Description:
In laboratory experiments, conspecific excretions and ammonia solutions evoked avoidance reactions in tadpoles of three anuran species, Bufo bufo, Rana temporaria, and Rana arvalis . A differential sensitivity of ammonia chemoreception was determined for two anuran species. For Bufo bufo tadpoles, these characteristics at ammonia backgr ound concentration of 0.2 mg/l lied in the range 150 % < dI/I < 500 %, and for background of 0.4 mg/l the value lied in th e range 400 % < dI/I < 500 %. For Rana temporaria tadpoles, differential threshold against ammonia background concentration of 0. 15 mg/l was close to 200 % and against background ammonia concentration of 1.1 mg/l was close to 100 %. These results suggest that such sensitivity of both anurans is sufficient for using ammonia in intra- and interspecies communication., Y. B. Manteifel, E. I. Kiseleva., and Obsahuje bibliografii a bibliografické odkazy
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

1674. AMN 082, an agonist of mGluR7, exhibits mixed anti- and proconvulsant effects in developing rats

Creator:
Pavel Mareš
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Experimentální medicína, fyziologie, epileptické záchvaty, ontogeneze, potkan, physiology, epileptic seizures, Rattus norvegicus, ontogeny, metabotropic glutamate receptors (mGlu Rs), uwanted motor efects, 14, and 616-092
Language:
English
Description:
Metabotropic glutamate receptors (mGluRs) represent a potential therapeutic target. Possible anticonvulsant action of AMN 082, an agonist of mGluR7 subtype, was studied in immature rats using pentylenetetrazol (PTZ)-induced seizures as a model. Five age groups of rats (7-, 12-, 18-, 25-day-old and adult animals) were pretreated with AMN 082 in doses of 0.5, 1, 2, and 5 mg/kg i.p. and 30 min later PTZ was administered (100 mg/kg s.c.). Controls received saline instead of the agonist. AMN 082 did not exhibit clear anticonvulsant action with the exception of suppression of the tonic phase of generalized tonic-clonic seizures (GTCS) in 12-day-old rats. Shorter latencies of GTCS after AMN 082 pretreatment indicate a proconvulsant action. Involuntary movements (mostly tremor) appeared after AMN 082 before PTZ administration, therefore we performed another experimental series with AMN 082 only (1, 2, 5, and 10 mg/kg i.p.). During 60-min observation period tremor appeared in all age groups; sensitivity to this action decreased with age from the 2 mg/kg dose in 7- and 12-day-old rats to the 10 mg/kg dose in adult rats. Mixed anti- and proconvulsant actions of AMN 082 together with unwanted motor effects makes clinical use of this drug highly improbable., Pavel Mareš., and Obsahuje bibliografii a bibliografické odkazy
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

1675. Amoebae isolated from organs of farmed tilapias, Oreochromis niloticus

Creator:
Dyková, Iva, Macháčková, Blanka, and Pecková, Hana
Format:
print
Type:
model:internalpart and TEXT
Subject:
Hartmannella vermiformis, Rosculus ithacus, and Nile tilapia
Language:
English
Description:
Three amoeba species were isolated from 3 out of 193 farmed tilapias, Oreochromis niloticus (L.), screened for the presence of free-living amoebae in parenchymatous organs. Hartmannella vermiformis Page, 1967 and Rosculus ithacus Hawes, 1963 were isolated from the kidney tissue. The third strain isolated from the liver shared morphological features of Mayorella and Platyamoeha spp. and therefore its taxonomic position has not been determined as yet. Pathogenicity of cloned strain of H. vermiformis was proved in two fish hosts.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

1676. Amoebic gill infection of turbot, Scophthalmus maximus

Creator:
Dyková, I., Figueras, A., and Novoa, B.
Format:
print
Type:
model:internalpart and TEXT
Subject:
amoebic infection, Scophthalmus maximus, and mariculture
Language:
English
Description:
Amoebae were found to cause severe gill tissue damage in turbot, Scophthalmus maximus L. from a grow-out facility in northwestern Galicia (Spain). The nature and extent of lesions along with negative results of bacteriological and virological examination made this agent responsible for mortalities in four turbot stocks supplied with water from a single source. We present our findings, although we failed to isolate amoebae, since there was a clear evidence of their primary role in the development of disease condition and occurrence of mortalities. In addition, this is a record both of a new host endangered by amoebae in intensive cultures and pathogenesis of the gill lesions.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

1677. Amoebic infections in goldfishes and granulomatous lesions

Creator:
Dyková, Iva, Lom, Jiří, Macháčková, Blanka, and Sawyer, Thomas K.
Format:
print
Type:
model:internalpart and TEXT
Subject:
Vannella platypodia, Rosculus ithacus, and goldfish granulomas
Language:
English
Description:
Ninety four aquarium fishes were screened for the presence of amoebae in their internal organs. Five specimens of Ca-rassius auratus (L.) and one specimen of Xiphophorus hetleri Heckel were positive. Of the three strains which were isolated from C. auratus, successfully cloned and cultivated, one was identified as Vannella platypodia (Gläser, 1912) Page, 1976 and two strains as Rosculus ithacus Hawes, 1963. Both species are reported for the first time from organs of fish. None of them could be identified with the amoeba-like agent of goldfish granulomas described here.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

1678. Among the onions and carrots: the “dissident” and the countersignature of post-totalitarianism

Creator:
Forsberg, Niklas
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Havel, meaning, power/knowledge, ideology, truth, and authenticity
Language:
Czech
Description:
This paper explores the notion of “power” prevalent in Václav Havel’s understanding of the post-totalitarian regime. With this notion of power, which is “seeping” in nature, rather than rooted solely in an individual agent’s actions, the role of the individual in the formation of the political “we” becomes a central issue. The starting point is Havel’s well-known example of “the greengrocer,” that illustrate how Havel pictures the way out of the post-totalitarian regime as one in which individuals move from living a lie to living in truth. I show how Havel’s talk about truth and authenticity, and his emphasis on a life in truth (which may appear judgemental, naive and cliché-like) is best understood. The wrong way to understand this is simply to say that people who merely obeyed that government, as the greengrocer did, are to be held accountable because they did not put up a fight against their oppressor. Such an understanding goes wrong because it fails to take into account the complexity of the relationship between power and language. In contrast to this, I argue that the central issue here is not that particular agents are to be held responsible for countersigning messages that they think are false. More precisely, I argue that the moral difficulty here is that the greengrocer’s deeds, which appear as countersignatures of the regime, are possible because the messages conveyed are “innocent” on the surface, in a “literal” sense. The moral dimension of the greengrocer’s actions, aiming to shed light on the complex relation between the government and the individual, is revealed as located in a field of tension between inherited sense and new projections. This, in turn, can help us to see the real nature of the transition Havel’s grocer undergoes when he moves from living a lie to living in truth. It is not a matter of negating a false statement or utterance, nor of replacing it with a true one. It is a matter of realising that the responsibility for meaning is, ultimately, ours – and that the way in which he, the grocer, is one of us is something that has to be earned.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

Limit your search

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »

Show values starting with
more »