Both, model polymers and plastic parts from WEEEs were studied and optimum experimental conditions, including dissolution temperature and time, polymer concentration and type of solvent were proposed click here to achieve significant recovery of the polymer (>90 wt %). Furthermore, pyrolysis of waste Compact Disks (CD) was investigated and compared with model poly(bisphenol
A carbonate) (PC) through a laboratory-scale fixed bed reactor. The appropriate pyrolysis temperature was selected after measuring the thermal degradation of model PC by Thermogravimetric analysis (TGA). A large amount of oil was measured, together with a smaller amount of gaseous product, leaving also a solid residue. For both samples, the gaseous fraction consisted mainly Of CO(2) and CO whereas in the liquid fraction a large amount of different phenolic compounds, including the monomer bisphenol A, was measured. It seems that recycling of used CDs by pyrolysis is a very promising RG-7112 research buy technique having the potential of producing useful high-value chemicals, which may find applications in the petrochemical industry. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 114: 212-221, 2009″
“Aim: To determine the effect
of zinc (Zn) therapy on serum insulin-like growth factor-l (IGF-I) and insulin-like growth factor binding protein-3 (IGFBP-3) levels in children with Zn deficiency and growth retardation, but without systemic disease, and to investigate the effect of Zn supplementation on these parameters.
Methods: Twenty-nine children (11 girls and 18 boys) Entinostat Epigenetics inhibitor were included.
Blood samples were obtained for serum IGF-I and IGFBP-3 determination before and after 50 mg/day Zn supplementation for two months.
Results: The mean age of the children was 11.0 +/- 3.1 years (range 3.7-16.2 years). Serum IGF-I and IGFBP-3 levels were below the mean values in 28 (96.6%) and all children, respectively. After Zn therapy, serum IGF-I levels were increased in 62% of the children; this increase was statistically significant in 48.3%, of the children. Serum IGFBP-3 levels were significantly increased in 10 children. There was a positive correlation between serum Zn level and bone age, and serum IGF-I and IGFBP-3 levels. A positive correlation was present between BMI (r = 0.485, p <0.001) and serum IGF-I levels before therapy.
Conclusion: Serum IGF-I and IGFBP-3 levels were decreased in children with Zn deficiency, and were increased after Zn supplementation. In addition, after Zn supplementation, increment of serum IGF-I levels was found to be higher in children with low BMI than those with normal BMI; therefore, the nutritional status of children may also be important, as well as Zn supplementation. Additionally, the determination of higher variation percentile of serum IGF-I level in prepubertal children compared to pubertal children was an interesting finding and necessitates further investigation.”
“Objective.