Results 101 to 110 of about 285,483 (304)
Double Bruhat Cells And Total Positivity
, 1998 This paper continues algebraic study of total positivity in semisimple algebraic groups undertaken in [3, 4]. The classical theory of total positivity studies matrices whose all minors are nonnegative. Recently, G.
Andrei Zelevinsky, Sergey Fomin
core
Total positivity criteria for partial flag varieties
, 2011 For a simply-connected complex algebraic group G of type A, D, or E, we prove (see C. Geiss et al. (2008) [12], Conjecture 19.2) a new family of total positivity criteria for partial flag varieties G/P, where P is a parabolic subgroup of ...
Chevalier, Nicolas, Nicolas Chevalier
core +1 more source
FEBS Letters, EarlyView.We reconstituted Synechocystis glycogen synthesis in vitro from purified enzymes and showed that two GlgA isoenzymes produce glycogen with different architectures: GlgA1 yields denser, highly branched glycogen, whereas GlgA2 synthesizes longer, less‐branched chains.
Kenric Lee +3 more
wiley +1 more source
Coefficientwise Total Positivity of Some Matrices Defined by Linear Recurrences [PDF]
, 2021 We exhibit a lower-triangular matrix of polynomials T(a,c,d,e,f,g) in~six indeterminates that appears empirically to be coefficientwise totally positive, and which includes as a special case the Eulerian triangle.
Chen, Xi +4 more
core
Total positivity in the De Concini-Procesi compactification
, 2004 We study the nonnegative part G >0 of the De Concini-Procesi compactification of a semisimple algebraic group G, as defined by Lusztig. Using positivity properties of the canonical basis and parametrization of flag varieties, we will give an explicit ...
He, Xuhua
core +2 more sources
Tau acetylation at K331 has limited impact on tau pathology in vivo
FEBS Letters, EarlyView.We mapped tau post‐translational modifications in humanized MAPT knock‐in mice and in amyloid‐bearing double knock‐in mice. Acetylation within the repeat domain, particularly around K331, showed modest increases under amyloid pathology. To test functional relevance, we generated MAPTK331Q knock‐in mice.
Shoko Hashimoto +3 more
wiley +1 more source
On total positivity of Riordan arrays
, 2020 A Riordan array = ( ( ), ( )) is defined as an infinite lower triangular matrix whose generating function of the kth column is ( ) ( ) , where and are formal power series with (0)=1, (0)=0, and ′(0) ≠ 0.
Li, Yutong
core
Regulators and total positivity [PDF]
, 2007 The classical regulator R of a number field K is given [F1] by a rapidly convergent series of the form where w is the number of roots of unity in K, D is the discriminant of K, am counts certain integral ideals in K of absolute norm m, and g : (0, ∞) → R ...
Friedman, Eduardo +2 more
core +1 more source
Total Positivity in Reductive Groups, II [PDF]
Bulletin of the Institute of Mathematics Academia Sinica NEW SERIES, 2019 42 ...
openaire +4 more sources
Structural insights into an engineered feruloyl esterase with improved MHET degrading properties
FEBS Letters, EarlyView.A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa +5 more
wiley +1 more source