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Start Over Coverage 249-258

1. On the localization of the spectrum for quasi-selfadjoint extensions of a Carleman operator

Creator:
Bahri, S. M.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
defect indices, integral operator, quasi-selfadjoint extension, and spectral theory
Language:
English
Description:
In the present work, using a formula describing all scalar spectral functions of a Carleman operator A of defect indices (1, 1) in the Hilbert space L 2 (X, µ) that we obtained in a previous paper, we derive certain results concerning the localization of the spectrum of quasi-selfadjoint extensions of the operator A.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

2. Potential protective effect of puncture vine (Tribulus terrestris, L.) against xylene toxicity on bovine ovarian cell functions

Creator:
Tarko, Adam, Štochmaľová, Aneta, Hrabovszká, Sandra, Vachanová, Adriana, Harrath, Abdel Halim, Aldahmash, Waleed, Grossman, Roland, and Sirotkin, Alexander V.
Format:
počítač and online zdroj
Type:
model:article and TEXT
Subject:
xylene, Tribulus terrestris, proliferation, apoptosis, hormones, and ovarian granulosa cells
Language:
English
Description:
The action of the medicinal plant Tribulus terrestris (TT) on bovine ovarian cell functions, as well as the protective potential of TT against xylene (X) action, remain unknown. The aim of the present in vitro study was to elucidate the influence of TT, X and their combination on basic bovine ovarian cell functions. For this purpose, we examined the effect of TT (at doses of 0, 1, 10, and 100 ng/ml), X (at 20 μg/ml) and the combination of TT + X (at these doses) on proliferation, apoptosis and hormone release by cultured bovine ovarian granulosa cells. Markers of proliferation (accumulation of PCNA), apoptosis (accumulation of Bax) and the release of hormones (progesterone, testosterone and insulin-like growth factor I, IGF-I) were analyzed by quantitative immunocytochemistry and RIA, respectively. TT addition was able to stimulate proliferation and testosterone release and inhibit apoptosis and progesterone output. The addition of X alone stimulated proliferation, apoptosis and IGF-I release and inhibited progesterone and testosterone release by ovarian cells. TT was able to modify X effects: it prevented the antiproliferative effect of X, induced the proapoptotic action of X, and promoted X action on progesterone but not testosterone or IGF-I release. Taken together, our observations represent the first demonstration that TT can be a promoter of ovarian cell functions (a stimulator of proliferation and a suppressor of apoptosis) and a regulator of ovarian steroidogenesis. X can increase ovarian cell proliferation and IGF-I release and inhibit ovarian steroidogenesis. These effects could explain its antireproductive and cancer actions. The ability of TT to modify X action on proliferation and apoptosis indicates that TT might be a natural protector against some ovarian cell disorders associated with X action on proliferation and apoptosis, but it can also promote its adverse effects on progesterone release.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public