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Wyświetlanie 1-6 z 6
Tytuł:
Are initially $ω_1$ -compact separable regular spaces compact?
Autorzy:
Dow, Alan
Juhász, Istvan
Powiązania:
https://bibliotekanauki.pl/articles/1205415.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
We investigate the question of the title. While it is immediate that CH yields a positive answer we discover that the situation under the negation of CH holds some surprises.
Źródło:
Fundamenta Mathematicae; 1997, 154, 2; 123-132
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the cardinality and weight spectra of compact spaces, II
Autorzy:
Juhász, Istvan
Shelah, Saharon
Powiązania:
https://bibliotekanauki.pl/articles/1205406.pdf
Data publikacji:
1997-04-10
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
cardinality and weight spectrum
compact space
homomorphism of Boolean algebras
Opis:
Let B(κ,λ) be the subalgebra of P(κ) generated by $[κ]^{≤λ}$. It is shown that if B is any homomorphic image of B(κ,λ) then either $|B| < 2^λ$ or $|B| = |B|^λ$; moreover, if X is the Stone space of B then either $|X| ≤ 2^{2^λ}$ or $|X| = |B| = |B|^λ$. This implies the existence of 0-dimensional compact $T_2$ spaces whose cardinality and weight spectra omit lots of singular cardinals of "small" cofinality.
Źródło:
Fundamenta Mathematicae; 1998, 155, 1; 91-94
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strongly almost disjoint familes, revisited
Autorzy:
Hajnal, A.
Juhász, Istvan
Shelah, Saharon
Powiązania:
https://bibliotekanauki.pl/articles/1205123.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
strongly almost disjoint family
property B
σ-transversal
Opis:
The relations M(κ,λ,μ) → B [resp. B(σ)] meaning that if $A⊂[κ]^λ$ with |A|=κ is μ-almost disjoint then A has property B [resp. has a σ-transversal] had been introduced and studied under GCH in [EH]. Our two main results here say the following: Assume GCH and let ϱ be any regular cardinal with a supercompact [resp. 2-huge] cardinal above ϱ. Then there is a ϱ-closed forcing P such that, in $V^P$, we have both GCH and $M(ϱ^{(+ϱ+1)},ϱ^+,ϱ) ↛ B$ [resp. $M(ϱ^{(+ϱ+1)},λ,ϱ) ↛ B(ϱ^+)$ for all $λ ≤ ϱ^{(+ϱ+1)}]$. These show that, consistently, the results of [EH] are sharp. The necessity of using large cardinals follows from the results of [Ko], [HJSh] and [BDJShSz].
Źródło:
Fundamenta Mathematicae; 2000, 163, 1; 13-23
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Feeding state and age dependent changes in melanin-concentrating hormone expression in the hypothalamus of broiler chickens
Autorzy:
Simon, Ádám
Németh, József
Jávor, András
Komlósi, István
Bai, Péter
Oláh, János
Juhász, Béla
Kiss, Rita
Szilvássy, Zoltán
Czeglédi, Levente
Powiązania:
https://bibliotekanauki.pl/articles/1038398.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
chicken
feeding states
hypothalamus
MCH
qPCR
RIA
Opis:
We aimed to quantify the gene expression changes of the potent orexigenic melanin-concentrating hormone (MCH) in chicken (Gallus gallus) hypothalamus with quantitative real-time polymerase chain reaction (qPCR), and for the first time determine peptide concentrations with a novel radioimmunoassay (RIA) under different feeding status. Three different experimental conditions, namely ad libitum feeding; fasting for 24 h; fasting for 24 h and then refeeding for 2 h, were applied to study changes of the aforementioned target and its receptor (MCHR4) gene expression under different nutritional status. The relative changes of MCH and MCHR4 were also studied from 7 to 35 days of age. Expression of PMCH and MCHR4 along the gastrointestinal tract (GIT) was also investigated. We found that expression of both targets was significant in the hypothalamus, while only weak expression was detected along the GIT. Different nutritional states did not affect the PMCH and MCHR4 mRNA levels. However, fasting for 24 h had significantly increased the MCH-like immunoreactivity by 25.65%. Fasting for 24 h and then refeeding for 2 h had further significantly increased the MCH peptide concentration by 32.51%, as compared to the ad libitum state. A decreasing trend with age was observable for both, the PMCH and MCHR4 mRNA levels, and also for the MCH-like immunoreactivity. Correlation analysis did not result in a significant correlation between MCH peptide concentration and abdominal fat mass in ad libitum fed birds. In conclusion, MCH peptide concentration altered in response to 24 h fasting, which indicated that this peptide may take part in feed intake regulation of broiler chickens.
Źródło:
Acta Biochimica Polonica; 2018, 65, 2; 251-258
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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