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2. Synové hrocha a dcery hrošíka aneb o poměru pohlaví hrochovitých v zoologických zahradách

Creator:
Pluháček, Jan and Steck, Beatrice
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Biologické vědy, hrochovití, mláďata, etologie, zoologické zahrady, zoologie, Hippopotamidae, young animals, ethology, Zoos, zoology, hroši, hrošíci, hroch obojživelný, hrošík liberijský, pohlaví mláďat, Hippopotamus amphibius, Choeropsis liberiensis, 2, and 57/59
Language:
Czech
Description:
Článek se zabývá studiem poměru pohlaví narozených mláďat u hrocha obojživelného (Hippopotamus amphibius) a hrošíka liberijského (Choeropsis liberiensis) chovaných v zoologických zahradách Evropy (hroch) a celého světa (hrošík). U obou druhů jsme zjistili vychýlení poměru pohlaví od vyrovnaného poměru 1 : 1, přičemž u hrocha je to ve prospěch synů a u hrošíka ve prospěch dcer. U každého z obou zkoumaných druhů ovlivňují poměr pohlaví jiné faktory a zřejmě také podmiňuje jiný mechanismus., We studied the birth sex ratio in captive Common Hippopotamus (Hippopotamus amphibius) and Pygmy Hippopotamus (Choeropsis liberiensis). In both species the birth sex ratio differed from 1 : 1. In Common Hippos more sons than daughters were born, whereas the opposite was found in Pygmy Hippos. Various factors affecting the birth sex ratio were analysed and discussed., and Jan Pluháček, Beatrice Steck.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. The effect of hypertension on adult hippocampal neurogenesis in young adult spontaneously hypertensive rats and Dahl rats

Creator:
Pistikova, A., Brozka, H., Bencze, M., Radostova, D., Vales, K., and Stuchlik, A.
Type:
article, model:article, and TEXT
Subject:
adult neurogenesis, captopril, hypertension, dahl rats, SHR, and young animals
Language:
English
Description:
The dentate gyrus of the hippocampus is one of the few places in the brain where neurogenesis occurs in adulthood. Nowadays, an increasing number of children and young adults are affected by hypertension, one of the factors in the development of cerebrovascular diseases and age-related cognitive deficits. Since these cognitive deficits are often hippocampus-dependent, it is possible that hypertension exerts this effect via decreasing adult neurogenesis which has been shown to be essential for a range of cognitive tasks. We used spontaneously hypertensive rats, which develop hypertension in the first weeks of life. Half of them were treated with the antihypertensive drug captopril. We found that the drug-induced lowering of blood pressure in this period did not affect the rate of adult neurogenesis. In a second experiment, we used another animal model of hypertension – salt-sensitive and salt-resistant strains of Dahl rats. A high-salt diet induces hypertension in the salt-sensitive strain, but not in the salt-resistant strain. The high-salt diet led to salt-induced hypertension, but did not affect the level of adult neurogenesis in the dentate gyrus of the hippocampus. We conclude that hypertension does not significantly affect the rate of hippocampal neurogenesis in young adult rats.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public