Search results for "Esox"
showing 3 items of 33 documents
18-hydroxylation in the Y-1 adrenal cell line: response to ACTH and to culture conditions.
1992
The 18-hydroxylation of deoxycorticosterone in the Y-1 adrenal cell line was studied under various incubation and cell culture conditions and compared to 11 beta-hydroxylation. Repeated incubation of the substrate increased both 18- and 11 beta-hydroxylation in the Y-1 cells. Furthermore, both 18- and 11 beta-hydroxylation were increased with increased serum concentration and prolonged incubation time. While the increase in 11 beta-hydroxylation seemed to be independent of the type of serum, 18-hydroxylation was much more important in cells cultured in fetal or newborn calf serum supplemented medium than in those cultured in horse serum supplemented medium. As expected, ACTH treatment incre…
UV-B exposure causes DNA damage and changes in protein expression in northern pike (Esox lucius) posthatched embryos.
2012
The ongoing anthropogenically caused ozone depletion and climate change has increased the amount of biologically harmful UV-B radiation, which is detrimental to fish in embryonal stages. The effects of UV-B radiation on the levels and locations of DNA damage manifested as cyclobutane pyrimidine dimers (CPDs), heat shock protein 70 (HSP70) and p53 protein in newly hatched embryos of pike were examined. Pike larvae were exposed in the laboratory to current and enhanced doses of UV-B radiation. UV-B exposure caused the formation of CPDs in a fluence rate-dependent manner, and the CPDs were found deeper in the tissues with increasing fluence rates. UV-B radiation induced HSP70 in epidermis, and…
Hauen (Esox lucius L.) ravinnonkäyttö pienissä suomalaisissa metsäjärvissä mahanäytteiden ja vakaiden isotooppien perusteella
2014
Monenlaisiin vesistötyyppeihin hyvin sopeutunut hauki (Esox lucius L.) kasvaa suotuisissa olosuhteissa kalaravinnon avulla nopeasti suurikokoiseksi ravintoketjun huippupedoksi. Saaliskalojen puuttuessa tai ravinnonsaatavuuden ollessa rajoitettua on kasvunopeus puolestaan hyvin hidasta. Pienten suomalaisten metsäjärvien haukien ravinnonkäyttöä ja sen vaikutusta kasvuun selvitettiin mahanäytteiden sekä vakaiden isotooppien avulla. Lisäksi selvitettiin evänäytteiden käytettävyyttä isotooppinäytteenä lihasnäytteiden rinnalla. Isotooppianalyyseissä käytettiin vapautetuista yksilöistä kerättyjä evänäytteitä, joiden δ13C ja δ15N arvot korreloivat voimakkaasti lihasnäytteiden kanssa. Evien happohuu…