Results 41 to 50 of about 334,818 (268)

The abstract, multidimensional varieties and their classification

open access: yesJournal of Numerical Analysis and Approximation Theory, 2004
We define abstract multidimensional variety without borders, using the investigation of the complex of multi-ary relations (H. Martini and P. Soltan, 2003 [3]) and the notion of compact, combinatorial, multidimensional variety without borders (V.
Mariana Bujac, Petru Soltan
doaj   +2 more sources

Towards refining the topological strings on compact Calabi-Yau 3-folds

open access: yesJournal of High Energy Physics, 2021
We make a proposal for calculating refined Gopakumar-Vafa numbers (GVN) on elliptically fibered Calabi-Yau 3-folds based on refined holomorphic anomaly equations. The key examples are smooth elliptic fibrations over (almost) Fano surfaces.
Min-xin Huang   +2 more
doaj   +1 more source

A Note on Poly-Instanton Effects in Type IIB Orientifolds on Calabi-Yau Threefolds

open access: yes, 2012
The zero mode structure for the generation of poly-instanton corrections for Euclidian D3-branes wrapping complex surfaces in Type IIB orientifolds with O7- and O3-planes is analyzed. Working examples of such surfaces and explicit embeddings into compact
Blumenhagen, Ralph   +3 more
core   +1 more source

Calpain small subunit homodimerization is robust and calcium‐independent

open access: yesFEBS Letters, EarlyView.
Calpains dimerize via penta‐EF‐hand (PEF) domains. Using single‐molecule force spectroscopy, we measured the strength and kinetics of PEF–PEF homodimer binding. The interaction is robust, shows a transient conformational step before dissociation, and remains largely insensitive to Ca2+.
Nesha May O. Andoy   +4 more
wiley   +1 more source

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

open access: yesFEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel   +13 more
wiley   +1 more source

Linking neurogenesis, oligodendrogenesis, and myelination defects to neurodevelopmental disruption in primary mitochondrial disorders

open access: yesFEBS Letters, EarlyView.
Mitochondrial remodeling shapes neural and glial lineage progression by matching metabolic supply with demand. Elevated OXPHOS supports differentiation and myelin formation, while myelin compaction lowers mitochondrial dependence, revealing mitochondria as key drivers of developmental energy adaptation.
Sahitya Ranjan Biswas   +3 more
wiley   +1 more source

Complex Geodetic and Photogrammetric Monitoring of the Kral’ovany Rock Slide

open access: yesJournal of Sustainable Mining, 2014
Purpose: The complex monitoring of rock slides with the size of 16 ha in order to predict the development of other slides and prevent possible human and material losses.
Marek Fraštia   +4 more
doaj   +1 more source

Holomorphic Poisson Cohomology [PDF]

open access: yes, 2014
A holomorphic Poisson structure induces a deformation of the complex structure as Hitchin's generalized geometry. Its associated cohomology naturally appears as the limit of a spectral sequence of a double complex.
Chen, Zhuo   +2 more
core  

Meromorphic vector fields with single-valued solutions on complex surfaces

open access: yes, 2019
We study ordinary differential equations in the complex domain given by meromorphic vector fields on K\"ahler compact complex surfaces. We prove that if such an equation has a maximal single valued solution with Zariski-dense image (in particular, if it ...
Guillot, Adolfo
core   +1 more source

Minimal Kernels and Compact Analytic Objects in Complex Surfaces [PDF]

open access: yes, 2020
In this paper, we want to study the link between the presence of compact objects with some analytic structure and the global geometry of a weakly complete surface. We begin with a brief survey of some now classic results on the local geometry around a (complex) curve, which depends on the sign of its self-intersection and, in the flat case, on some ...
Mongodi Samuele, Tomassini Giuseppe
openaire   +3 more sources

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