The aim of this work is the preparation of a biodegradable polymeric blend
(LDPE/AD+S) to be used for eco-friendly packaging purposes. The polymer matrix
consists mainly of low density polyethylene( LDPE), starch (S), and low quantities of
additiv
es (AD) as compatibilizers. The additives are: maleic acid, acetic acid, benzoyl
peroxide, and zinc stearate. The polymer blend LDPE/AD+S was prepared by extrusion, in
three compositions according to the percentage of starch (15,20,40%). Then, films were
prepared from the blend by thermal hydraulic compression to study their microstructure by
optical microscopic at magnification of 055 The results showed that the starch granules
were homogeneously distributed within the polymer matrix, and the compatibility
additives played an important role in enhancing the microstructure of the prepared blends.
The results also indicate that the starch promotes the onset of the bioegradation process.
The research was performed by isolating some species of soil- fungi from agricultural soils
handling with different pesticides and fungicides. Where the following fungi were isolated:
Aspergillus niger (The isolates A1 and A2), Fusarium oxysporum (
The isolate F),
Trichoderma harzianum (The isolate T). Also F. solani (The isolate F7) and T. viride (The
isolate T.v) were used, whereas they were taken from high studies laboratory- Science
Faculty- Tishreen University at a previous search.
The research was conducted to assay the ability of the previous fungi to degradation a
number of pesticides, the insecticide "Dolan", the insecticide "Plantocide", the nematicide
"Vydate" and the fungicide "Bayfidan", through the effect of double dose of each
pesticides in the biomass of the studied fungi on PDB medium. In addition to analysis the
results residues of pesticides using Spectrophotometer, and evaluation the pH values.
After morphological and biochemical studies, 11 strains of Actinobacteria
were isolated, mostly of them belong to the genus Streptomyces, these
strains were used later to detect their ability in cellulase and xylanase
enzymes production during the initial detection depending on the diameter
of the halo transparent around cultured colonies on solid media.
The linear alkyl benzene sulfonate is organic pollutants resulting from uses of detergents types. I have conducted several studies on the Mediterranean to monitor the concentrations of these pollutants, however, little is known about the fate of the
environment and the effect of environmental factors on the degradation these compounds.
In this research laboratory to conduct a study of the degradation of alkyl benzene sulfonate compounds under different conditions, during the period from September to November 2007 period cuddling continued for three months, and storage the samples in different conditions, (Laboratory conditions presence of light, laboratory conditions in isolation from the light at 25 C° and 15 C°) were identified in total concentration of LAS hydrological and specifications according to the following program:(0-1-3-5-7-14-21-30-45-60-90) day.
The results showed decrease total concentration of compounds LAS with the passage of time cuddling, compounds change specifications hydrological water by the biodegradation of the vital processes of photosynthesis taking place in aqueous media.
Proteus volgaris was isolated from costal sea water of Lattakia city port, as it is contaminated with petroleum compositions coming from marine transportations activities. The ability of this bacteria to degrade the petroleum alkanes was studied by
using different concentrations of petroleum as sole source of carbon and energy. The gas chromatography (GC) technique was used to measure the concentration of alkanes. Results showed that the isolated bacteria were able to degrade different alkanes chains. The ratio of biodegradation of C12, C16, C18 were 96.75%, 78.59%, 97.27% respectively, while the rate of biodegradation of the entire amount of alkanes was 77.14% in 10 mg/ml polluting concentration. The percentage of biodegradation at concentration 75 mg/ml of petroleum was 17.26%.
Therefore, the high ability of Proteus volgaris to degrade the long chains alkanes recommended it to be effective in the bioremediation process of the contaminated marine environments.
