Search results for "Polyp"

Polyphosphoester surfactants as general stealth coatings for polymeric nanocarriers

2020

Opsonization of nanocarriers is one of the most important biological barriers for controlled drug delivery. The typical way to prevent such unspecific protein adsorption and thus fast clearance by the immune system is the covalent modification of drug delivery vehicles with poly(ethylene glycol) (PEG), so-called PEGylation. Recently, polyphosphoesters (PPEs) were identified as adequate PEG substitutes, however with the benefits of controllable hydrophilicity, additional chemical functionality, or biodegradability. Here, we present a general strategy by non-covalent adsorption of different nonionic PPE-surfactants to nanocarriers with stealth properties. Polyphosphoester surfactants with dif…

Novel cationic copolymers of a polyasparthylhydrazide: synthesis and characterization.

2005

Alpha,beta-poly(asparthylhydrazide) (PAHy), a water soluble synthetic polymer, was functionalized by using EDCI chemistry with 3-(carboxypropyl)trimethyl-ammonium chloride (CPTACl) obtaining carboxypropyltrimethyl ammonium copolymers (PAHy-CPTA). Three PAHy-CPTA copolymers at increasing derivatization degrees (38%, 48%, 58%) were chosen for subsequent investigations. The capability of these copolymers to bind, neutralize, and protect DNA against degradation by DNase II was evalued by gel retardation assay and DNA degradation test at pH 5.5. Zeta potential measurements show that all studied polymers are able to neutralize the anionic charge of DNA at polymer/DNA weight ratio in the range of …

Resveratrol, a polyphenolic phytoalexin present in red wine, enhances expression and activity of endothelial nitric oxide synthase.

2002

Background— Estrogens can upregulate endothelial nitric oxide synthase (eNOS) in human endothelial cells by increasing eNOS promoter activity and enhancing the binding activity of the transcription factor Sp1. Resveratrol, a polyphenolic phytoalexin found in grapes and wine, has been reported to act as an agonist at the estrogen receptor. Therefore, we tested the effect of this putative phytoestrogen on eNOS expression in human endothelial cells. Methods and Results— Incubation of human umbilical vein endothelial cells (HUVEC) and HUVEC-derived EA.hy 926 cells with resveratrol for 24 to 72 hours upregulated eNOS mRNA expression in a time- and concentration-dependent manner (up to 2.8-fold)…

COPD in elderly patients – an analysis of the DACCORD observational study

2018

Introduction: In elderly patients COPD is frequently complicated by the presence of several comorbidities and the many non-COPD-related medications prescribed to treat these conditions. This analysis aims to characterize COPD patients above the age of 75 in a real-world cohort in Germany. Methods: DACCORD is a prospective, non-interventional study collecting data from COPD patients treated in primary and secondary care. Prior to study entry, patients either initiated or changed COPD maintenance medication. Moderate/severe exacerbations, COPD-medication and non-COPD medication were documented at baseline and every 3 months. Comorbidities were documented at baseline. Results: Baseline charact…

Relationship between the risk of falling and prescribed medication in community-dwelling elderly subjects.

2013

Abstract Introduction: The risk of falling increases with age. A third of the population over 65 has one or more falls per year. Objetive: to know the relationship between drug prescription and falls in the elderly. Materials and Methods: a study was carried out through a community intervention in individuals ≥ 70 years of age. Results: The sample was composed of 249 participants, 160 women (64%), with a mean age of 74.47 years (SD 5.33). During the 12 months prior to the study, the mean of falls per person was 0.5 (SD 0.94), the mean of the risk factors was 2.73 (SD 1.4) and the mean of the medication prescribed was 4.2 (SD 3.0). The percentage of the reduction of falls after the study was…

Quels sont les patients diabétiques de type 2 à risque d’interactions médicamenteuses ?

2019

Prescribing behaviour of practitioners in public and private hospitals in Pakistan evaluated using the World Health Organization (WHO) indicators: A …

2017

Summary Introduction The non-rational use of medicines by medical practitioner in their prescribing practices might lead to therapeutic failure. The aim of this research was to evaluate medical prescriptions and to highlight differences in behaviour between prescribers of public and private hospitals in Karachi (Pakistan). Materials and methods This is a retrospective study conducted between November 2015 to October 2016 in 4 public hospitals and 4 private hospitals in Karachi. A total of 120,096 (n) prescriptions were collected from both public and private hospitals. The data were evaluated with WHO indicators for rational use of medicines. Results The average number of drugs per prescript…

Cost-effectiveness of psychotropic polypharmacy in routine schizophrenia care. Results of the ELAN prospective observational trial

2018

Abstract Aims To analyse the costs and cost-effectiveness of psychotropic polypharmacy in comparison to antipsychotic monotherapy in patients with schizophrenia and schizo-affective disorder under real-world treatment conditions. Methods A prospective observational study including 374 adult psychiatric in-patients with schizophrenia or schizo-affective disorder was conducted. Psychotropic regimen, clinical outcomes, and quality of life were assessed before discharge and after 6, 12, 18, and 24 months. Costs and outcomes of psychotropic polypharmacy in comparison to antipsychotic monotherapy were analysed by means of mixed-effects regression models adjusted for propensity scores. Net-benefit…

Polarographic determination of tyrosinase activity in enzymatic reaction with tyrosine as a substrate

2003

A voltammetric investigation of tyrosinase activity is proposed as an alternative to the spectrophotometric method. Voltammetric approach provides low detection limit, high sensitivity and resistivity to the solution inhomogenity, as well as enables one to simultaneously monitor the dioxygen consumption in the reaction, which is an additional indicator of the tyrosinase enzymatic activity.

POLYPHENOL OXIDASE ACTIVITY FROM THREE SICILIAN ARTICHOKE (CYNARA CARDUNCULUS L. VAR. SCOLYMUS L. (FIORI)) CULTIVARS: STUDIES AND TECHNOLOGICAL APPLI…

2010

Several papers helped with the development of more methods to control browning, or study thermal polyphenol oxidase (PPO) inactivation, but did not provide any solutions to technological process problems and food process improvement. Artichokes [ Cynara cardunculus L. var. scolymus L. (Fiori)] are susceptible to browning; this alteration could affect and reduce the suitability for its use, fresh or processed. Within this study, the catecholase and cresolase activities of PPO from three different Sicilian artichokes cultivar were characterized with regard to substrate specificity and enzyme kinetics, optimum pH and temperature, temperature and pH stability, and inhibitor test; all of the res…