Results 111 to 120 of about 588,918 (412)
Characterization of manifolds of constant curvature by spherical curves
, 2019 It is known that the so-called rotation minimizing (RM) frames allow for a simple and elegant characterization of geodesic spherical curves in Euclidean, hyperbolic, and spherical spaces through a certain linear equation involving the coefficients that ...
da Silva, José D., da Silva, Luiz C. B.
core +1 more source
Advanced Healthcare Materials, EarlyView.The PVA‐GA hydrogel is formed through hydrogen bonding between PVA hydroxyl groups and GA galloyl units, enabling sustainable GA release and its extended biological activity. The hydrogel scavenges ROS to reduce oxidative stress, preventing mitochondrial damage from excessive ROS, mitigating hADSC senescence, and preserving VEGF secretion, offering a ...
Yiduo Zhou +11 more
wiley +1 more source
Stem Cell Research & TherapyBackground Induced pluripotent stem cells (iPSCs) can differentiate into any type of cell and have potential uses in regenerative medicine for the treatment of many diseases. However, reducing immune rejection is a key problem in the application of iPSCs
Ji He +6 more
doaj +1 more source
Tangentially biharmonic Lagrangian H-umbilical submanifolds in complex space forms
, 2014 The notion of Lagrangian $H$-umbilical submanifolds was introduced by B. Y. Chen in 1997, and these submanifolds have appeared in several important problems in the study of Lagrangian submanifolds from the Riemannian geometric point of view.
Sasahara, Toru
core
Curvature-controlled defect dynamics in active systems
, 2017 We have studied the collective motion of polar active particles confined to ellipsoidal surfaces. The geometric constraints lead to the formation of vortices that encircle surface points of constant curvature (umbilics).
Dunlop, John W. C. +3 more
core +1 more source
Totally quasi-umbilic timelike surfaces in $\mathbb{R}^{1,2}$ [PDF]
arXiv, 2010 For a regular surface in Euclidean space $\mathbb{R}^3$, umbilic points are precisely the points where the Gauss and mean curvatures $K$ and $H$ satisfy $H^2=K$; moreover, it is well-known that the only totally umbilic surfaces in $\mathbb{R}^3$ are planes and spheres.
arxiv
Bioprinted Micro‐Clots for Kinetic Analysis of Endothelial Cell‐Mediated Fibrinolysis
Advanced Healthcare Materials, Volume 14, Issue 7, March 14, 2025.This paper describes the development of a microscale model that quantifies the breakdown of fibrin by endothelial cells. The small size scale of this engineered system enables fibrin breakdown to be observed without the addition of external activators. This system could help in identifying compounds which both promote and hinder thrombosis.
Jonathan J. Chang +5 more
wiley +1 more source
State of vascular wall of umbilical arteries of fetus at cytomegalovirus infection
Acta Biomedica Scientifica, 2015 The paper describes the details of electron-microscopic study of the intima of blood vessels of the umbilical cord, produced during childbirth from women undergoing in the 111 trimester of gestation cytomegalovirus infection.
N. N. Dorofienko
doaj
Invariants and Umbilical Points on Three Dimensional CR Manifolds embedded in $\mathbb C^2$ [PDF]
arXiv, 2016 We introduce a new sequence of CR invariant determinants on a three dimensional CR manifold $M$ embedded in $\mathbb C^2$. The lowest order invariant $\det A_3$ represents E. Cartan's 6th order invariant (the umbilical "tensor"), whose zero locus yields the set of umbilical points on $M$.
arxiv
Umbilical Cord Care in the Newborn Infant
Pediatrics, 2016 Postpartum infections remain a leading cause of neonatal morbidity and mortality worldwide. A high percentage of these infections may stem from bacterial colonization of the umbilicus, because cord care practices vary in reflection of cultural traditions
D. Stewart, W. Benitz
semanticscholar +1 more source