677 research outputs found
Zinc-promoted reactions. 6. The reduction of diphenylcyclopropenone in acidic media
No full textThe reduction of diphenylcyclopropenone with zinc was investigated under a variety of conditions. The product distribution can be explained in terms of a general mechanism for zinc-promoted reductions
Effect of darkness and CO2 starvation on NH4+ and NO3- assimilation in the unicellular alga Cyanidium caldarium.
No full textEnd-of-life management of oil and gas offshore platforms: challenges and opportunities for sustainable decommissioning
No full textPurpose of the paper: The decommissioning of offshore platforms represents a significant and controversial challenge that has gained attention over the years due to its environmental, social, and economic impact. This work aims to investigate stakeholders’ perceptions regarding the future of offshore platforms and to explore dimensions of sustainability related to decommissioning.
Methodology: An analysis was carried out based on two rounds of empirical inquiry, a range of primary data collected through multiple-choice questionnaires and in-depth interviews.
Findings: The analysis shows that stakeholders perceive reuse as an opportunity to minimise the impacts according to an environmental, economic, and social perspective. While the multipurpose platform represents an opportunity for the future, it also presents challenges.
Research limitations: The study relies only on qualitative analysis techniques and on a limited sample and geographical area.
Practical implications: The analysis offers several insights into the decommissioning scenario according to a sustainable and circularity perspective and contributes to the decommissioning debate by providing information about decommissioning programs, stakeholders’ impacts, and future planning considerations.
Originality of the paper: The study contributes knowledge to the field and useful managerial insights, highlighting stakeholders’ perception in the Italian context and exploring dimensions of sustainability and main SDGs related to the issu
Regulatory aspects of NH4+ utilization in the acidophilic thermophilic unicellular red alga Cyanidium caldarium.
No full textHeterotrophic growth patterns in the unicellular alga Cyanidium caldarium.A possibile role for threonine dehydrase.
No full textZinc-promoted reactions. Part 11. 1 Ionic reactions and single electron transfers in the Zn/TMSCI reduction of benzaldehyde
No full textStudies in vivo on the control by ammonia of nitrate reduction to nitrite in the unicellular alga Cyanidium caldarium.
No full textWhen intact cells of the acidophilic red alga Cyanidium caldarium, grown at pH 1.9 with nitrate as sole nitrogen source, are transferred to pH 7.5, they actively reduce nitrate to nitrite which accumulates in the external medium. At pH 7.5 nitrite is not further reduced to ammonia. Formation of nitrite from nitrate occurs in the light or in the dark, either in the presence or in the absence of oxygen. In cell suspensions supplied with ammonia in addition to nitrate, the formation of nitrite at pH 7.5 is strongly prevented. However ammonia is not able to prevent nitrite formation at pH 9.4. Nitrate reductase is 40% latent in cells resuspended at pH 7.5 in the presence of nitrate and up to 90% latent in cells resuspended in the presence of both nitrate and ammonia. It is proposed that the inhibition by ammonia of nitrate reduction to nitrite is based on the latent state that nitrate reductase exhibits in the presence of ammonia. In fact, at pH 9.4, when the production of nitrite is not inhibited by ammonia, nitrate reductase is only 14-25% latent even in cells resuspended in the presence of nitrate and ammoni
Amfora antike të vona nga qyteti i Shkodrës (shek. V-fillimi i shek. VII)./Amphores antiques tardives provenant de Shkodra (Ve siècle-début du VIIe siècle)
No full textHoxha Zim. Amfora antike të vona nga qyteti i Shkodrës (shek. V-fillimi i shek. VII)./Amphores antiques tardives provenant de Shkodra (Ve siècle-début du VIIe siècle). In: Iliria, vol. 22, 1992. pp. 209-243
Zinc-promoted Reactions. Part 10.1 Reduction of α- and β-Cyano Ketones in Protic and Aprotic Systems
No full textRight to know e Convenzione europea dei diritti dell’uomo. I giudici di Strasburgo infliggono un altro duro colpo al diritto di accesso agli atti della pubblica amministrazione nel caso Studio Monitori e altri c. Georgia
No full textIl 30 gennaio 2020 la Corte Europea dei Diritti dell’Uomo si è pronunciata nel caso Studio Monitori and Others v. Georgia (ric. n. 44920/09 e 8942/10), statuendo, conformemente alla sua più recente giurisprudenza, che, alla presenza di determinate condizioni, un diritto di accesso alle informazioni detenute dalla pubblica amministrazione può essere implicitamente desumibile dal dettato all’art. 10 della Convenzione Europea dei Diritti dell’Uomo. Il caso ha costituito per i giudici di Strasburgo una delle prime occasioni per chiarire nel dettaglio la portata normativa dell’Art. 10 così come elaborata dagli stessi nella sentenza relativa al caso Magyar Helsinki Bizottság v. Hungary (ric. n. 18030/11) dello scorso 8 novembre 2016. I giudici tuttavia sviluppano in Studio Monitori una linea argomentativa che, pur richiamando una giurisprudenza ormai in via di consolidamento, aggiunge alcuni piccoli dettagli che sembrano restringere ancor di più la possibilità di enucleare un diritto di accesso alle informazioni dal disposto dell’art. 10. I giudici di Strasburgo adottano nella loro pronuncia una posizione che sembra porsi in netta contraddizione con quella che è l’accezione estensiva della nozione di diritto di accesso fatta propria dallo stesso Consiglio d’Europa e più in generale dagli stessi Stati Membri all’interno dei rispettivi ordinamenti giuridici
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