"Progetto acqua" scuola primari Gigante/Porto- I.C. Comenioricciouno
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"Progetto acqua" scuola primari Gigante/Porto- I.C. Comenioricciouno
La caratteristica fondamentale dell'educazione ambientale è la sua trasversalità, in relazione alla globalità con cui si presentano i problemi nel reale.
Gli alunni sono stati guidati alla scoperta e conoscenza, sempre più consapevole e approfondita, dell' ambiente naturale nei suoi elementi costitutivi e, in particolare, dell' elemento "Acqua" come bene primario prezioso, da utilizzare e preservare responsabilmente
This document discusses time-series forecasting based on past data. It explains that forecasting relies on current factors and past experiences continuing into the future. Forecasting is never perfect and accuracy decreases over longer time horizons. The steps in forecasting include determining the purpose and time horizon, selecting a technique, analyzing data, making the forecast, and monitoring results. Approaches can be qualitative, quantitative, judgmental, or based on time-series patterns like trends, seasons, and cycles. Common time-series forecasting methods are naive, moving averages, and exponential smoothing.
This document discusses genetic modification of food and the various opinions surrounding it. It begins by outlining the principles and process of genetically modifying seeds. Both arguments against and supporting genetic modification are then presented. Critics argue it may lead to antibiotic resistance, nutrient alteration, toxicity and allergens in food. Supporters counter that it increases food availability and quality through traits like drought and pest resistance. The document also examines regulators' stances on genetically modified foods.
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How to enter like a Virgin: An analysis of Virgin America's entry into the US...Robbie Allan
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Breve tesina preparata per l'esame di geologia ambientale. Il testo si occupa di analizzare queli sono le caratteristiche delle acque potabili erogate dagli acquedotti rispetto a quelle delle acque minerali e in particolare si concentra sul diverso impatto ambientale che il consumo delle une rispetto alle altre comporta. Si è anche preso in considerazione l''LCA di un nuovo biopolimero (PLA)per la produzione di bottiglie per la commercializzazione delle acque minerali.
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EAPPREN -Capacity building for Intermediary Organisations(EMP) GEORGE DIAMANDIS
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2. Concetti di base
Le acque minerali naturali, come tutte le acque sotterranee
contengono una flora batterica naturale
La presenza della normale flora di acqua minerale ha dato luogo a
una serie di domande e dibattiti riguardo al suo effetto sulla salute
poiché l’acqua minerale naturale non può essere disinfettata.
3. Microrganismi acque sotterranee utilizzano il carbonio
organico negli acquiferi esistenti.
Di solito, le reazioni avvengono senza ossigeno.
Altri composti che possono influenzare le reazioni sono:
derivati per (nitrati); manganese (IV), ferro (III), solfato
(SO4
2+), CO2.
L'accumulo di CO2 porta a sorgenti effervescenti naturali.
Normalmente, nelle falde acquifere, la fornitura di carbonio
e di energia utilizzabile è molto esigua.
4. Nell’ habitat sotterrano, tutte le forme di vita più grandi dei
microrganismi sono escluse (a causa delle caratteristiche
fisiche delle falde acquifere).
5. Le analisi microbiologiche sulle acque minerali naturali
hanno sempre rivelato la presenza di alcuni batteri che sono
in grado di crescita e possono formare colonie su appropriati
terreni di coltura.
6. CFU: unità formanti colonie
• In genere le colonie isolate dalle acque alla sorgente sono meno di 1-4 UFC /mL.
• Nel serbatoio di stoccaggio e subito dopo l'imbottigliamento sono, in media,
leggermente superiori
• Durante la conservazione a 20 ° C, le popolazioni batteriche aumentano,
raggiungendo un picco di oltre 105 CFU/mL dopo 7 giorni.
• Nelle successive 4 settimane il numero delle colonie o diminuisce o rimane
costante.
• A di stanza di 2 anni dallo stoccaggio, la conta delle colonie sono ancora circa 103
UFC/mL.
7. Alcune informazioni riguardo ai batteri presenti nelle
acque minerali:
• Sono psicrotrofi (possono crescere a temperature di 5 °C).
• La temperatura massima di crescita è di 35°C.
• Non necessitano di fattori di crescita.
• Sembra avere diverso potenziale di crescita a seconda del
materiale della bottiglia e le dimensioni.
• La crescita non dipende dalla temperatura di stoccaggio.
• Ridurre le sue dimensioni per essere vantaggioso.
• Principalmente aerobica, saprofiti, Gram negativi.
8. Molti acque minerali contengono 0,1 - 0,7 mg/L di
carbonio organico disciolto (metà di esso non è facilmente
biodegradabile).
È che teoricamente possibile prevedere il numero di
batteri presenti nelle bottiglie di acque minerali.
Possono esistere altri fattori limitanti (ad esempio fosforo).
Di solito sono isolati solo i batteri, ma raramente è possible
riscontrare la presenza di miceti.
Mediamente le acque effervescenti hanno meno batteri
10. Durante la procedura di imbottigliamento
L'aria compressa viene utilizzata in quasi tutte le fasi del processo di
imbottigliamento dell'acqua: per cui la qualità microbiologica
dell’aria deve essere controllata.
L’eventuale sostanza organica presente in bassa concentrazione può
essere notevolmente modificata sotto l'influenza dell’ aumento della
temperatura ed ossigenazione
11. C'è una relazione con la superficie/volume del contenitore. Maggiore è
la superficie in relazione al volume di acqua, più rapidamente avviene
la crescita di batteri.
Tale fenomeno è dovuto ai nutrienti presenti in bassa concentrazione
che sono assorbiti e concentrati sulle superfici di contatto.
12. La fotodegradazione di materia organica disciolta è un fenomeno
comune
La luce può stimolare la crescita di microrganismi.