In this work, antioxidant hydrogels were prepared by the construction of an interpenetrating chitosan network and functionalization with gallic acid. The poly(2-hydroxyethyl methacrylate) p(HEMA)-based hydrogels were first synthesized and subsequently surface-modified with an interpenetrating polymer network (IPN) structure prepared with methacrylamide chitosan via free radical polymerization. ...

While research on the cerebellar cortex is crystallizing our understanding of its function in learning behavior, many questions surrounding its downstream targets remain. Here, we evaluate the dynamics of cerebellar interpositus nucleus (IpN) neurons over the course of Pavlovian eyeblink conditioning. A diverse range of learning-induced neuronal responses was observed, including increases and d...

BACKGROUND Infected pancreatic necrosis (IPN) is the main cause of death in patients with severe acute pancreatitis. Therefore an early prediction of IPN is of utmost importance. AIM Analysis of new blood variables as potential early predictors to differentiate between IPN and sterile pancreatic necrosis (SPN). PATIENTS 64 consecutive patients with acute pancreatitis were enrolled in this p...

Four derivatives of hyaluronic acid (HA) bearing thiol (HA-SH), hydrazide (HA-hy), 2-dithiopyridyl (HA-SSPy), and aldehyde groups (HA-al) respectively were synthesized. Thiol and 2-dithiopyridyl as well as hydrazide and aldehyde make up two chemically orthogonal pairs of chemo-selective functionalities that allow in situ formation of interpenetrating (IPN) disulfide and hydrazone networks simul...

The influence of ethylene glycol methacrylate (EGMA) to the hydration and transition behaviors of thermo-responsive interpenetrating polymeric network (IPN) hydrogels containing sodium alginate, N-isopropylacrylamide (NIPAAm), and EGMA were investigated. The molar ratios of NIPAAm and EGMA were varied from 20:0 to 19.5:0.5 and 18.5:1.5 in the thermo-responsive alginate-Ca2+/P(NIPAAm-co-EGMA) IP...

Interpenetrating polymer network (IPN) refers to a type of elastomer in which two chemically distinct networks coexist, ideally having a structure that is homogeneous down to the segmental level [1]. The two components are present as co-continuous, interlocking networks (catenanes). This co-continuity can be achieved by kinetic retention of an initially miscible mixture of the monomers used to ...

The present study is aimed at developing novel type of interpenetrating polymeric network (IPN) hydrogels of chitosan with poly(acrylic acid) for the controlled release of amphetamine drug. IPN hydrogels were synthesized by simultaneous polymerization/crosslinking of acrylic acid monomer in the presence of chitosan and crosslinker. The swelling properties and in vitro drug release characteristi...

In the framework of the so called InterPlaNetary (IPN) Internet, the paper surveys possible advanced communications and networking solutions applied by a specific IPN node architecture. The proposed solutions have been preliminarily evaluated by using the ns2 simulator by considering possible network status changes due to the nodes’ movements, typical in the deep space scenario. In particular, ...

This work is concerned with observability in Discrete Event Systems (DES) modeled by Interpreted Petri Nets (IPN). Three major contributions are presented. First, a novel geometric characterization of observability based on input-output equivalence relations on the marking sequences sets is presented. Later, to show that this characterization is well posed, it is applied to linear continuous sy...

Eduardo P. Pérez E. Marine Biologist, Universidad Católica del Norte (UCN), Chile. M.Sc. and Ph.D., Centro de Investigación y Estudios Avanzados (CINVESTAV-IPN), Mexico. Professor, Department of Marine Biology, UCN, Chile and Researcher, Centro de Estudios Avanzados en Zonas Áridas, Coquimbo, Chile. Address: Casilla 117, Coquimbo, Chile, e-mail: [email protected] Omar Defeo. Ph.D., CINVESTAV-IPN, M...