1,721,044 research outputs found
Biotite-kaolinite transformation in a granitic saprolite of the Serre (Calabria, southern Italy)
No full textThe chemical and mineralogical variation caused by the weathering on granitic profile in the Serre area of Calabria (Southern Italy) was studied. The results obtained show that the biotite transform to vermiculite (unstable) and kaolinite. In the clay fraction of the saprolite kaolinite is by far the most abundant phyllitic phase. The biotite-kaolinite transformation and the marked impoverishment of many geochemical species, almost total in the case of CaO and Na2O, are typical phenomena of a more aggressive climate than the present on
A Progressive Approach Towards a More Sustainable Food Industry
No full textCimini A., Moresi M. (2019) A Progressive Approach Towards a More Sustainable Food Industry. Chemical Engineering Transactions, 75, 565-570 (DOI: 10.3303/CET1975095). (OPEN ACCESS)
In this work, the main direct environmental impacts of the food industry, as well as greenhouse gas (GHG)
emissions for the agro-food system in industrialized countries, were pointed out. A simple and stepwise
approach, based on the mere assessment of the product Carbon Footprint (CF), was used to improve the
sustainability of small- and medium-sized food and drink enterprises before analyzing the impact of other
impact categories than climate change. By applying previously developed LCA models, the cradle-to-grave
carbon footprint of dry pasta and malt beer was estimated and practically halved by resorting to a series of
mitigation options. A cost/benefit analysis is required to assess the feasibility of each selected option.This research was supported by the Italian Ministry of Instruction, University and Research, special grant
PRIN 2015 – prot. 2015MFP4RC_002
Viscoelastic properties of microbial alginate gels by oscillatory dynamic tests
No full textThe jellifying capacity of some alginate gels excreted by Azotobacter vinelandii DSM 576 was studied by oscillatory tests at
alginate concentrations (c) of 1.0% and 1.5% w/w. Frequency dependence of the complex shear modulus (G ) permitted these gels to
be discriminated in terms of their different orders of the relaxation function (a) and ‘‘gel stiffness’’ (Aa ) values using Friedrich and
Heymann theory [Journal of Rheology, 32 (1988) 235]. Of the samples tested that characterised by a guluronate content of 25% and
a number-average molecular mass (Mn ) of 263.4 kDa exhibited a gel stiffness at c
1⁄4 1% w/w of the same order of magnitude of that
pertaining to alginates extracted from Macrocystis pyrifera or Lessonia nigrescens with greater guluronate contents (35–40%) but
smaller number-average molecular masses (70–110 kDa) with about half of a.
Whereas a was found to depend exponentially on the ratio of guluronate to mannuronate monad frequencies (NG=M) only, Aa was
expressed as a power function of c, Mn , NG=M, and average G-block length (NG ). The limited data available, as well as incomplete
understanding of the real controlling factors for ionotropic gelation of alginates, made such empirical correlations just useful for a
preliminary screening of alginates independently of their weed or microbial origin
Produzione di etanolo con lieviti immobilizzati in un bioreattore a letto fluidizzato trifasico
No full textEffect of dissolved oxygen concentration on repeated production of gluconic acid by immobilised mycelia of Aspergillus niger
No full textProduzione in semicontinuo di acido gluconico con miceli immobilizzati di Aspergillus niger
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