Search results for "BIODEGRADABLE"

Antibiotic in vivo/in vitro release, histocompatibility and biodegradation of gentamicin implants based on lactic acid polymers and copolymers

1995

Abstract Biodegradable implants containing 10 mg of gentamicin each were prepared by compressing the polymer-drug mixture. The liberation of gentamicin from the implants and the biodegradation of the implants were investigated by following in vitro and in vivo experiments. Implants based on pure poly( l -lactic acid) (L-PLA) released the incorporated antibiotic throughout 30 days with a decreasing delivery rate. During the first 24 h L-PLA implants released a total amount of 3600 μg gentamicin. Within 14 days the release rate had decreased to about 12 μg/day. The release profile of implants based on dl -lactic acid-glycolic acid copolymer (RG 502) was completely different. About 1900 μg wer…

Polyethylene and Biodegradable Starch-Based Mulching Films Affect Winter Melon Production in a Mediterranean Area

2012

Dense drug-eluting biodegradable Fe-Ag nanocomposites

2021

Abstract Biodegradable metals in orthopedics are aimed to eliminate secondary the surgical intervention for implant removal, and thus improve patient compliance, reduce surgery costs and the risk of infections. In addition, biodegradable implants could be loaded with different drugs to prevent the growth of pathogens and the development of bone infections, kill remaining cancer cells after tumor resection or stimulate bone regeneration. However, drugs undergo thermal decomposition under the conditions of conventional metal fabrication processes. In this work, we describe the fabrication of a dense drug-eluting biodegradable Fe-Ag nanocomposite containing 10 vol% of Ag and loaded with the an…

Ecocomposites obtained from MaterBi(R) and lignocellulosic fillers

2011

The role of aspect ration in the mechanical properties of lignocellulosic ecocomposites obtained from MaterBi(R)

2011

Performance of MaterBi(R) based ecocomposites

2011

Assessment of organic waste management methods through energy balance

2014

In Italy, the Organic Fraction of Municipal Solid W aste (OFMSW) is nowadays landfilled or processed through aerobic composting. The Italian towns curre ntly support a high cost for OFMSW disposal and cause a high environmental impact, because of long distance s travelled from towns to a few available landfills and fewer treatment places, as well as the used waste m anagement methods. An interesting option for OFMSW is Anaerobic Digestion (AD), producing biogas and “digestate”. In this survey a theoretical biogas plant was placed near a town of Sicily Region (Italy), centra lised with reference to the area considered for pro ducing OFMSW. The distances travelled every year to transport OFMS…

Processing and Properties of Biopolymer/Polyhydroxyalkanoates Blends

2011

In this paper, the processability and the performance of a biodegradable polymer, Mater-Bi, and of its blends with either a sample of poly (hydroxy alkanoates) (PHA) or with bacterial biomass containing PHAs were compared. Adding PHA or directly the biomass containing it allows improving the processability of the matrix. Moreover, the mechanical behaviour of the systems was compared considering two different preparation methods, namely compression and injection moulding. The injection moulded samples show poorer mechanical performances than those of the compression moulded systems. The impact strength significantly improves when PHA is added while it reduces when bacterial biomass is used i…

Hydrolysis rates, methane production and nitrogen solubilisation of grey waste components during anaerobic degradation.

2005

Abstract Municipal grey waste (i.e. the remaining fraction in municipal waste management systems in which putrescibles (biowaste) and other recyclables (paper, metals, glass) are source-segregated) was manually sorted into six main fractions on the basis of composition and also separated by sieving (100 mm mesh size) into two fractions, oversized and undersized, respectively. In practice, in waste management plant the oversized fraction is (or will be) used to produce refuse-derived fuel and the undersized landfilled after biological stabilisation. The methane yields and nitrogen solubilisation of the grey waste and the different fractions (all studied samples were first milled to 5 mm part…

Effects of storage on characteristics and hygienic quality of digestates from four co-digestion concepts of manure and biowaste.

2007

This study evaluated the effects of storage in northern winter conditions (5 degrees C) on the characteristics and nutrients separation of digestates from co-digestion of manure and biowaste as well as the hygienic quality of the digestates after digestion and storage. During 3-11 months' storage average nitrogen losses and reductions of total solids (TS) and volatile solids (VS) were 0-15%. With some exceptions, soluble chemical oxygen demand (SCOD) had increased slightly (from approximately 6.5 to approximately 7.5g/l) after 3 months' storage, while after 9-11 months' it had decreased from 8.3-11 to 5.6-8.4g/l. The concentrations of P(tot) and PO4-P in the separated liquid fractions decre…