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Humic acids (HAs) content of raw water is an important analytical parameter in water treatment facilities because HAs in the presence of chlorine may lead to the formation of dangerous by-products (e.g., trihalomethanes). The concentration of HAs in water is not directly accessible by common analytical methods due to their heterogeneous chemical structure. The aim of this study was to compare t...

........................................................................................................................................................................... 198 Introduction ...................................................................................................................................................................... 199 Material and Methods ...................

Cooling A. nidulans or P. cruentum from 26 °C to 4 °C results in progressive spectral changes. The most significant changes are increases in absorbance at 690 nm (photosystem II), 678 nm (antenna chlorophyll), 625 nm (phycocyanin), and 505 nm (electrochromic band). In the case of P. cruentum there are also increases in absorbance at 568 and 545 nm (B-phycoerythrin) and a decrease at 587 nm. The...