Raman Study of Block Copolymers of Methyl Ethylene Phosphate with Caprolactone and L-lactide.

We present an in-depth analysis of Raman spectra of novel block copolymers of methyl ethylene phosphate (MeOEP) with caprolactone (CL) and L-lactide (LA), recorded with the excitation wavelengths of 532 and 785 nm. The experimental peak positions, relative intensities and profiles of the poly(methyl ethylene phosphate) (PMeOEP), polycaprolactone (PCL) and poly(L-lactide) (PLA) bands in the spectra of the copolymers and in the spectra of the PMeOEP, PCL and PLA homopolymers turn out to be very similar. This clearly indicates the similarity between the conformational and phase compositions of PMeOEP, PCL and PLA parts in molecules of the copolymers and in the PMeOEP, PCL and PLA homopolymers.

Biometric traits of onion (Allium cepa L.) exposed to Cs and Am under hydroponic cultivation.

To elucidate the features of bioaccumulation and phytotoxic effects of long-lived artificial radionuclides, a hydroponic experiment was carried out with the cultivation of onion (Allium cepa L.) in low-mineralized solutions spiked with Cs (250 kBq L) or Am (9 kBq L). After the 27-day growth period, ≈70% of Cs and ≈14% of Am were transferred from the solutions to onion biomass with transfer factor values ≈ 400 and ≈ 80, respectively.