Results 71 to 80 of about 797,892 (301)
Hereditarity of closure operators and injectivity [PDF]
, 1992 summary:A notion of hereditarity of a closure operator with respect to a class of monomorphisms is introduced. Let $C$ be a regular closure operator induced by a subcategory $\Cal A$.
Giuli, Eraldo +3 more
core
Neighborhoods and convergence with respect to a closure operator
, 2011 We study neighborhoods with respect to a categorical closure operator. In particular, we discuss separation and compactness obtained from neighborhoods in a natural way and compare them with the usual closure separation and closure compactness.
Josef Šlapal
core +1 more source
Structural and biochemical analysis of a B12 superbinder
FEBS Letters, EarlyView.BtuG proteins are vitamin B12 scavengers in Bacteroides thetaiotaomicron, a dominant human gut bacterium. We present crystal structures of three BtuG homologs bound to cobalamin and its precursor cobinamide, revealing picomolar binding affinities, among the highest known for any natural protein.
Jose M. Martinez Felices +3 more
wiley +1 more source
On closure operators of Jonsson sets
Қарағанды университетінің хабаршысы. Математика сериясыThe work is related to the study of the model-theoretic properties of Jonsson theories, which, generally speaking, are not complete. In the article, on the Boolean of Jonsson subsets of the semantic model of some fixed Jonsson theory, the concept of the
Olga Ulbrikht
doaj +1 more source
On the fixed points of the iterated pseudopalindromic closure operator
, 2010 International audienceFirst introduced in the study of the Sturmian words by de Luca in 1997, iterated palindromic closure was generalized to pseudopalindromes by de Luca and De Luca in 2006.
Jamet, Damien +7 more
core +1 more source
FEBS Letters, EarlyView.Mycobacterial 3‐methylcrotonyl‐CoA carboxylase uses a mobile biotin‐carrying domain to shuttle a carboxyl group between two catalytic sites, enabling carboxylation of 3‐methylcrotonyl‐CoA during leucine breakdown. Cryo‐electron microscopy captures the carrier at both sites and reveals an inward loop movement that may prevent futile rebinding to the ...
Ajit Yadav +2 more
wiley +1 more source
FUZZY CLOSURE SYSTEMS AND FUZZY CLOSURE OPERATORS
Communications of the Korean Mathematical Society, 2004 Summary: We introduce fuzzy closure systems and fuzzy closure operators as extensions of closure systems and closure operators. We study relationships between fuzzy closure systems and fuzzy closure spaces. In particular, two families \(F(S)\) and \(F(C)\) of fuzzy closure systems and fuzzy closure operators on \(X\) are complete lattice isomorphic.
Kim, Yong Chan, Ko, Jung Mi
openaire +2 more sources
Orthogonality and closure operators [PDF]
, 1995 Given a full and replete subcategory A of a category X, we present a new closure operator, which allows a characterization of the class of all morphisms to which A is orthogonal and of the orthogonal hull of A by means of density and closedness ...
Sousa, Lurdes
core +1 more source
Algebraic reflexivity of isometry groups and automorphism groups of some operator structures [PDF]
, 2013 We establish the algebraic re exivity of three isometry groups of operator structures: The group of all surjective isometries on the unitary group, the group of all surjective isometries on the set of all positive invertible operators equipped with ...
Botelho, Fernanda +2 more
core