129,760 research outputs found
Il razionamento proteico del cavallo
No full textConfronto del razionamento proteico in 27 allevamenti di cavalli sportivi secondo il sistema delle proteine digeribili (Pd) e delle proteine digeribili cavallo (Pdc
Mechanistic Insights into the Organopolymerization of N-Methyl N-Carboxyanhydrides Mediated by N-Heterocyclic Carbenes
No full textWe report on a DFT investigation of initiation, propagation; and termination in the organopolymerization of N-methyl N-carboxyanhydrides toward cyclic poly(N-substituted glycine)s, promoted by N-heterocyclic carbenes (NHC). Calculations support the experimentally based hypothesis of two competing initiation pathways. The first leading to formation of a zwitterionic adduct by nucleophilic addition of the NHC to one of the carbonyl groups of monomer. The second via acid base reactivity, starting with the NHC promoted abstraction of a proton from the methylene group of the monomer, leading to an ion-pair-type adduct, followed by nucleophilic attack of the adduct to a new monomer molecule. Chain elongation can proceed from both the initiation adducts via nucleophilic attack of the carbamate chain-end to a new monomer molecule via concerted elimination of CO, from the carbamate chain-end. Energy barriers along all the considered termination pathways are remarkably higher that the energy barrier along the chain elongation pathways, consistent with the quasi-living experimental behavior. Analysis of the competing termination pathways suggests that the cyclic species determined via MALDI-TOF MS experiments consists of a zwitterionic species deriving from nucleophilic attack of the N atom of the carbamate chain end to the C=O group bound to the NHC moiety
Note sulla scrittura greca corsiva
No full textCavallo Guglielmo. Note sulla scrittura greca corsiva. In: Scriptorium, Tome 22 n°2, 1968. pp. 291-294
Note sulla scrittura greca libraria dei papiri
No full textCavallo Guglielmo. Note sulla scrittura greca libraria dei papiri. In: Scriptorium, Tome 26 n°1, 1972. pp. 71-76
Kurt Aland. Repertorium der griechischen christlichen Papyri. I. Biblische Papyri : Altes Testament, Neues Testament, Varia, Apokryphen
No full textCavallo Guglielmo. Kurt Aland. Repertorium der griechischen christlichen Papyri. I. Biblische Papyri : Altes Testament, Neues Testament, Varia, Apokryphen. In: Scriptorium, Tome 33 n°2, 1979. pp. 306-307
Suitability of composting process for the disposal and valorization of brewer’s spent grain
No full textThe brewing industry is characterized by the large production of by-products. Following the fundamentals of a circular economy, several attempts to recycle brewers’ spent grain (BSG) have been investigated. However, little information is available on its use for composting. Consid-ering the main parameters required for optimal development of composting, the objective of the present review was to analyze the literature to determine whether the microbial and physicochemical characteristics of BSG make it suitable for direct composting. As the main factors in the composting process, we considered the BSG moisture content, total carbon, total nitrogen, C/N ratio, and pH. As described in the literature, the BSG moisture content, C/N ratio, and pH range from 70.6% to 81.3%, 7.1 to 26.5, and 3.8 to 6.9, respectively. This C/N ratio range is lower than the composting target range (20–30). Instead, the mean moisture content in the literature is higher than the 60% to 65% recommended for composting. Optimum pH for aerobic stabilization of compost ranges from 5.5 to 7.5, while the BSG pH in the literature is typically more acidic. Therefore, BSG is not suitable for direct composting. Addition of lignocellulosic bulking agents improves the reduction of moisture content during composting, while also optimizing the substrate properties, such as C/N ratio, air spaces, and pH, to positively affect the composting process. Moreover, livestock manure should be included as a starting material to promote the composting process. In this context, two hypothetical initial mixtures of BSG plus a lignocellulosic bulking agent and livestock manure are presented
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