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Wyświetlanie 1-3 z 3
Tytuł:
Almost Self-Complementary Uniform Hypergraphs
Autorzy:
Wojda, Adam Paweł
Powiązania:
https://bibliotekanauki.pl/articles/31342288.pdf
Data publikacji:
2018-05-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
uniform hypergraph
Opis:
A $k$-uniform hypergraph ($k$-hypergraph) is almost self-complementary if it is isomorphic with its complement in the complete $k$-uniform hypergraph minus one edge. We prove that an almost self-complementary $k$-hypergraph of order $n$ exists if and only if \( \binom{n}{k} \) is odd.
Źródło:
Discussiones Mathematicae Graph Theory; 2018, 38, 2; 607-610
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On odd and semi-odd linear partitions of cubic graphs
Autorzy:
Fouquet, Jean-Luc
Thuillier, Henri
Vanherpe, Jean-Marie
Wojda, Adam
Powiązania:
https://bibliotekanauki.pl/articles/743181.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
Cubic graph
linear arboricity
strong matching
edge-colouring
Opis:
A linear forest is a graph whose connected components are chordless paths. A linear partition of a graph G is a partition of its edge set into linear forests and la(G) is the minimum number of linear forests in a linear partition.
In this paper we consider linear partitions of cubic simple graphs for which it is well known that la(G) = 2. A linear partition $L = (L_B,L_R)$ is said to be odd whenever each path of $L_B ∪ L_R$ has odd length and semi-odd whenever each path of $L_B$ (or each path of $L_R$) has odd length.
In [2] Aldred and Wormald showed that a cubic graph G is 3-edge colourable if and only if G has an odd linear partition. We give here more precise results and we study moreover relationships between semi-odd linear partitions and perfect matchings.
Źródło:
Discussiones Mathematicae Graph Theory; 2009, 29, 2; 275-292
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calcium-binding calmyrin forms stable covalent dimers in vitro, but in vivo is found in monomeric form.
Autorzy:
Sobczak, Adam
Blazejczyk, Magdalena
Piszczek, Grzegorz
Zhao, Gang
Kuznicki, Jacek
Wojda, Urszula
Powiązania:
https://bibliotekanauki.pl/articles/1041431.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
covalent dimer
calmyrin monomer
human lymphocytes
EF-hand calcium-binding proteins
Opis:
The EF-hand Ca^(2+)-binding protein calmyrin is expressed in many tissues and can interact with multiple effector proteins, probably as a sensor transferring Ca^(2+) signals. As oligomerization may represent one of Ca^(2+)-signal transduction mechanisms, we characterised recombinant calmyrin forms using non-reducing SDS/PAGE, analytical ultracentrifugation and gel filtration. We also aimed at identification of biologically active calmyrin forms. Non-reducing SDS/PAGE showed that in vitro apo- and Ca^(2+)-bound calmyrin oligomerizes forming stable intermolecular disulfide bridges. Ultracentrifugation indicated that at a 220 µM initial protein concentration apo-calmyrin existed in an equilibrium of a 21.9 kDa monomer and a 43.8 kDa dimer (trimeric or tetrameric species were not detected). The dimerization constant was calculated as Ka = 1.78 × 103 M^(-1) at 6oC. Gel filtration of apo- and Ca^(2+)-bound calmyrin at a 100 µM protein concentration confirmed an equilibrium of a monomer and a covalent dimer state. Importantly, both monomer and dimer underwent significant conformational changes in response to binding of Ca^(2+). However, when calmyrin forms were analyzed under non-reducing conditions in cell extracts by Western blotting, only monomeric calmyrin was detected in human platelets and lymphocytes, and in rat brain. Moreover, in contrast to recombinant calmyrin, crosslinking did not preserve any dimeric species of calmyrin regardless of Ca^(2+) concentrations. In summary, our data indicate that although calmyrin forms stable covalent dimers in vitro, it most probably functions as a monomer in vivo.
Źródło:
Acta Biochimica Polonica; 2005, 52, 2; 469-476
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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