0000000000748509
AUTHOR
Ma Rao
Azoto
1. Introduzione p. 282 2. Determinazione dell’azoto totale con analizzatore elementare p. 284 3. Determinazione dell’azoto totale con metodo semi-micro-Kjeldahl p. 284 4. Determinazione dell’azoto totale con metodo semi-micro-Kjeldahl modificato p. 287 5. Determinazione dell’azoto totale estraibile con soluzione salina con metodo micro-Kjeldahl p. 291 6. Determinazione dell’azoto totale estraibile con soluzione salina con metodo micro-Kjeldahl modificato p.294 7. Determinazione colorimetrica degli ioni ammonio estraibili p. 296 8. Determinazione colorimetrica degli ioni nitrato estraibili p. 298 9. Estrazione dell’azoto totale idrolizzabile con acido cloridrico p. 300 10.Determinazione dell…
Interaction between a recombinant prion protein and organo-mineral complexes as evidenced by CPMAS 13C-NMR
Prion proteins (PrP) are the main responsible for Transmissible Spongiform Encephalopathies (TSE). The TSE etiological agent is a misfolded form of the normal cellular prion protein. The amyloidal aggregates accumulated in the brain of infected animals and mainly composed of PrPSc exhibit resistance to protease attack and many conventional inactivating procedures. The prion protein diseases cause an environmental issue because the environment and in particular the soil compartment can be contaminated and then become a potential reservoir and diffuser of TSEs infectivity as a consequence of (i) accidental dispersion from storage plants of meat and bone meal, (ii) incorporation of contaminate…
Soil enzyme assays using p-nitrophenyl derivatives: an inter-laboratory comparison
Reproducibility and reliability of soil enzyme assays need to be validated by comparing results among different labs. The Italian Group of Enzymology organized a ring test among five labs. Beta-glucosidase, acid- and alkaline phosphatase activities were chosen as they are all measurable by using substrates with wide applicability, i.e. p-nitrophenyl derivatives. The five labs preliminarily agreed and standardised the specific methodological procedure for each enzymatic activity, also taking into account factors such as practicability and equipment availability. Nine soils with contrasting physico- chemical and biological properties were adequately sampled, pre-treated and sieved, in order t…