The turnover of the proteomes of organelles in plant cells are known to be governed by both whole cell and organelle-specific processes. However, the rate and specificity of this protein turnover has not been explored in depth to understand how it affects different organellar processes. Here we have used progressive ¹⁵N labeling of Arabidopsis cells, and focused on the turnover rate of proteins...

Glucocorticoids induce a selective 5to lo-fold increase in the rate of synthesis of tyrosine aminotransferase in rat hepatoma cells in tissue culture. Addition of insulin to steroid-induced cells stimulates a further 2to 3-fold increase in the cellular concentration of this enzyme. The induction by insulin occurs after a lag of only 6 min and does not require concomitant RNA synthesis. Insulin ...

A range of hydrogels were prepared by solution polymerization of methacrylic acid, poly(ethyleneglycol) methyl ether methacrylate (M.W. 475 g/mol) and poly(ethyleneglycol) dimethacrylate (as the cross-linking, M.W. 550 or 875 g/mol) in various proportions. The effects of methacrylic acid/ poly(ethyleneglycol) methyl ether methacylate concentration ratios as well as cross-linking concentration i...

In this paper, Ag/ZnO/HZSM-5ternary nanocomposites with different Ag loadings were prepared by the photo precipitation method. The prepared photocatalysts were characterized by XRD, BET, SEM and TEM. The photocatalytic activity of ZnO/HZSM-5 for 4-nitrophenol (4-NP) degradation was increased by silver doping. Effects of various parameters such as the initial concentration of 4-NP, pH and Ag loa...

The degradation of high molecular weight as-polymerized poly(L-lactide) (PLLA) is very slow; it takes more than 5.6 yr for total resorption. Moreover, the degradation products of as-polymerized PLLA bone plates, consisting of numerous stable particles of high crystallinity, are related with a subcutaneous swelling in patients 3yr postoperatively. In order to avoid these complications, polymers ...

This research evaluates the efficiency of nanosized ZnO in the catalytic ozonation of 4-chloro-2-nitrophenol and determines the effect of pH on heterogeneous catalytic ozonation. The combined use of ozone and ZnO catalyst leads to conversion of 98% 4-chloro-2-nitrophenol during 5 min. In addition, it was found that in ZnO catalytic ozonation, the degradation efficiency of 4-chloro-2-nitrophenol...

In this study, PP films were modified with an organic pro-degradant in different concentrations (1, 2 and 3 wt.%), exposed in the first step of degradation to natural ageing for 100 days followed by biodegradation in simulated soil in the respirometric test for 100 days. At the end of the combined degradation process the PP samples were characterized according to their morphological and physica...

1. In yeast growing on ethanol a turnover rate of up to 2%/h was measured. As much as 80% of the protein was subject to turnover, and no marked heterogeneity in the rate of degradation of protein was observed. When the yeast grew on glucose, the protein was degraded at a lower rate (0.5-1%/h). 2. Starvation for a nitrogen source increased the rate of protein degradation severalfold, whereas dep...

in this study, pp films were modified with an organic pro-degradant in different concentrations (1, 2 and 3wt.%), exposed in the first step of degradation to natural ageing for 100 days followed by biodegradation insimulated soil in the respirometric test for 100 days. at the end of the combined degradation process the pp sampleswere characterized according to their morphological and physical p...

this research evaluates the efficiency of nanosized zno in the catalytic ozonation of 4-chloro-2-nitrophenol and determines the effect of ph on heterogeneous catalytic ozonation. the combined use of ozone and zno catalyst leads to conversion of 98% 4-chloro-2-nitrophenol during 5 min. in addition, it was found that in zno catalytic ozonation, the degradation efficiency of 4-chloro-2-nitrophenol...