Search results for "IBA"
showing 10 items of 1355 documents
The Impact of Business Group Affiliation and Country-Level Institutions on Corporate Governance of Emerging Market Firms
2020
This study outlines how the corporate governance of emerging market firms is influenced by corporate affiliation and institutional embeddedness. We argue that the stronger the business group affiliation, the less likely is the emerging market firm to adopt shareholder value enhancing corporate governance, and that this relationship is moderated by institutional quality and tribalism. Based on189 initial public offerings (IPOs) from 22 African countries between 2000and 2016, we find a significant negative relationship between business group ownership and IPO firms’ quality of corporate governance. We also find this relationship to be significantly negatively moderated by country-level instit…
Toward potent antibiofilm degradable medical devices: A generic method for the antibacterial surface modification of polylactide
2013
International audience; The effects of biomaterials on their environment must be carefully modulated in most biomedical applications. Among other approaches, this modulation can be obtained through the modification of the biomaterial surface. This paper proposes a simple and versatile strategy to produce non-leaching antibacterial polylactide (PLA) surfaces without any degradation of the polyester chains. The method is based on a one-pot procedure that provides a "clickable" PLA surface via anionic activation which is then functionalized with an antibacterial quaternized poly(2-(dimethylamino)ethyl methacrylate) (QPDMAEMA) by covalent immobilization on the surface. The anti-adherence and an…
Functionalized silver doped hydroxyapatite scaffolds for controlled simultaneous silver ion and drug delivery
2017
Abstract Bacterial infections are a major problem in bone tissue regeneration, thus it is essential to incorporate antibacterial properties within the bone scaffolds. Silver compounds are frequently used as antibacterial agents to prevent bacterial infections and numerous studies have shown that silver ions can be incorporated within the biocompatible and osteoconductive biomaterial hydroxyapatite (HAp) structure, but, so far, no study has thoroughly evaluated silver ion release rates in long term. Therefore, we have established a novel carrier system for local drug delivery based on functionalized silver doped hydroxyapatite with determined long term silver ion release rates. Silver ions f…
Paper Functionalized with Nanostructured TiO2/AgBr: Photocatalytic Degradation of 2–Propanol under Solar Light Irradiation and Antibacterial Activity
2020
A facile method to produce paper&ndash
Charge State of Silver Halide Colloids Determines the Antibacterial Activity in Amorphous Calcium Phosphate
2013
Removal of bacteria is important not only at implantation, but after long-term implant/prosthesis use. This requires strategies that employ different approaches for combating bacteria. Halides have the potential of an additional mechanism, and together with silver may provide a more powerful antibacterial strategy. Silver iodide was synthesized as colloids with a positive and negative charge and incorporated into an amorphous calcium phosphate (ACP) to provide a possible greater antibacterial action. Colloids were characterized by FTIR spectroscopy and the charge measured by zeta potential. Phase analysis by X-ray diffraction patterns confirmed the formation of b-AgI nanoparticles. Minimum …
Tunable release of Chlorhexidine from Polycaprolactone-based filaments containing graphene nanoplatelets
2019
Abstract Graphene nanoplatelets (GNP) as fillers and Chlorhexidine (CHX), as an antibacterial agent, were incorporated in a polycaprolactone (PCL) matrix and processed into filaments by melt spinning. The influence of both drawing and formulation on the processability, spinnability, mechanical properties and release behaviour of these materials were deeply investigated by performing rheological, morphological analysis, tensile tests, and by measuring the cumulative release of CHX in PBS at 37 °C. Furthermore, Korsmeyer–Peppas model was adopted to study the kinetics release mechanism. The results showed that adding GNP did not alter the processability and spinnability of the systems. Further…
Combining carvacrol and nisin in biodegradable films for antibacterial packaging applications
2021
Abstract In this work, the feasibility of antibacterial biopolymeric films containing carvacrol (CRV) and a nisin commercial formulation (Nis) for potential food packaging applications was investigated. As polymer matrix, a commercial biodegradable polymer formulation of Mater-Bi (MB) was chosen due to its significant food packaging applications. CRV and Nis were chosen due to their well-established antibacterial properties and their potential synergistic effect. MB/CRV, MB/Nis, and MB/CRV/Nis systems were produced by melt mixing and compression molding. The mechanical properties of the films were evaluated by tensile tests. Differential scanning calorimetry was assessed aiming at investiga…
Anti-bacterial activity of graphene oxide as a new weapon nanomaterial to combat multidrug-resistance bacteria.
2016
Antibiotic resistance in microbial pathogens has become a serious health problem in the world. The increasing spread of hospital acquired infections especially in immunocompromised and cancer patients caused by multidrug-resistant (MDR) microbial pathogens is restricting the choices for impressive antibiotic therapy. So many efforts have been made to develop new compounds with antimicrobial activity. In recent years, nanoparticles, particularly graphene oxide (GO) nanoparticles have found many applications in various fields, including antibacterial action, pathogens bio detection, cancer therapy, and drug and gene delivery. The use of graphene oxide as an antibacterial agent for the treatme…
Antibacterial and barrier properties of oriented polymer films with ZnO thin films applied with atomic layer deposition at low temperatures
2014
Abstract Concerns on food safety, and need for high quality and extended shelf-life of packaged foods have promoted the development of antibacterial barrier packaging materials. Few articles have been available dealing with the barrier or antimicrobial properties of zinc oxide thin films deposited at low temperature with atomic layer deposition (ALD) onto commercial polymer films typically used for packaging purposes. The purpose of this paper was to study the properties of ZnO thin films compared to those of aluminum oxide. It was also possible to deposit ZnO thin films onto oriented polylactic acid and polypropylene films at relatively low temperatures using ozone instead of water as an o…
Afghanistan and the language of equality : a social contract in the making on a world-system fault
2013
The international intervention in Afghanistan started more than ten years ago. It built on new institutions according to the democratic model, complete with concepts generalized in the Western world since the 18th century, and among them the principle of equality. This model had founded the Amirs’ wished socio-political changes all along the 20th century, but ended in an on-going 30-year chaos with ever-renewed adversaries since the 1970’s. As operated in Afghanistan, tribalism and modernity – meant as an ideology, result in opposition prevaling as a social behaviour, which produces fragmentation or destruction and deals with equality demands through group honor. Consequently, traditionalis…