Results 41 to 50 of about 426,018 (280)

4-dimensional pseudo-Galilean geometry

Cumhuriyet Science Journal, 2021
According to F. Klein, Geometry is the study of invariant properties of figures, i.e., properties unchanged under all motions. In this article, we introduce 4-dimensional pseudo-Galilean transformations.
Salim Yüce, Mücahit Akbıyık
doaj  

CURVATURE APPROXIMATION FROM PARABOLIC SECTORS

Image Analysis and Stereology, 2017
We propose an invariant three-point curvature approximation for plane curves based on the arc of a parabolic sector, and we analyze how closely this approximation is to the true curvature of the curve.
Ximo Gual-Arnau, Maria Victoria Ibáñez Gual, Juan Monterde   +2 more
doaj   +1 more source

Group-invariant soliton equations and bi-Hamiltonian geometric curve flows in Riemannian symmetric spaces

, 2007
Universal bi-Hamiltonian hierarchies of group-invariant (multicomponent) soliton equations are derived from non-stretching geometric curve flows $\map(t,x)$ in Riemannian symmetric spaces $M=G/H$, including compact semisimple Lie groups $M=K$ for $G=K ...
Anco, Anco, Anco, Anco, Anco, Athorne, Athorne, Bishop, Chou, Chou, Chou, Chou, Doliwa, Dorfman, Goldstein, Guggenheimer, Gurses, Helgason, Kobayashi, Lamb, Langer, Magri, Magri, Mari Beffa, Mari Beffa, Nakayama, Olver, Sanders, Sanders, Sergyeyev, Sharpe, Sokolov, Stephen C. Anco, Wang   +33 more
core   +4 more sources

Reciprocal control of viral infection and phosphoinositide dynamics

FEBS Letters, EarlyView.
Phosphoinositides, although scarce, regulate key cellular processes, including membrane dynamics and signaling. Viruses exploit these lipids to support their entry, replication, assembly, and egress. The central role of phosphoinositides in infection highlights phosphoinositide metabolism as a promising antiviral target.
Marie Déborah Bancilhon, Bruno Mesmin
wiley   +1 more source

Easement Curve of Involute Gear Tooth with Pre-Set Shape

Наука и техника, 2004
The paper contains a new methodology to set and optimize parameters of easement curve of involute gear tooth. The methodology is based on the principles of generalized parameter method. Shape of easement curve is invariant to tool parameters.
A. S. Marchuk
doaj   +1 more source

On the vanishing of higher syzygies of curves

, 2001
The present paper is related to a conjecture made by Green and Lazarsfeld concerning 1-linear syzygies of curves embedded by complete linear systems of sufficiently large degrees.
Aprodu, Marian
core   +2 more sources

An upstream open reading frame regulates expression of the mitochondrial protein Slm35 and mitophagy flux

FEBS Letters, EarlyView.
This study reveals how the mitochondrial protein Slm35 is regulated in Saccharomyces cerevisiae. The authors identify stress‐responsive DNA elements and two upstream open reading frames (uORFs) in the 5′ untranslated region of SLM35. One uORF restricts translation, and its mutation increases Slm35 protein levels and mitophagy.
Hernán Romo‐Casanueva, Ariann E. Mendoza‐Martínez, P. Abril Medina‐Flores, Carlos Campero‐Basaldua, Alexander DeLuna, Soledad Funes   +5 more
wiley   +1 more source

Structural instability impairs function of the UDP‐xylose synthase 1 Ile181Asn variant associated with short‐stature genetic syndrome in humans

FEBS Letters, EarlyView.
The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li, Pedro A. Sánchez‐Murcia, Bernd Nidetzky   +2 more
wiley   +1 more source

Family of quadratic differential systems with invariant parabolas: a complete classification in the space ${\mathbb R}^{12}$

Electronic Journal of Qualitative Theory of Differential Equations
Consider the class ${\bf QS}$ of all non-degenerate planar quadratic differential systems and its subclass ${\bf QSP}$ of all its systems possessing an invariant parabola.
Nicolae Vulpe
doaj   +1 more source

Towards the symplectic Graber-Harris-Starr theorems [PDF]

, 2012
A theorem of Graber, Harris, and Starr states that a rationally connected fibration over a curve has a section. We study an analogous question in symplectic geometry.
Tian, Zhiyu
core