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- Morales, M., et al.
(author)
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Sustainability assessment of succinic acid production technologies from biomass using metabolic engineering
- 2016
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In: Energy and Environmental Sciences. - : Royal Society of Chemistry (RSC). - 1754-5692 .- 1754-5706. ; 9:9, s. 2794-2805
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Journal article (peer-reviewed)abstract
- Over the past few years, bio-succinic acid from renewable resources has gained increasing attention as a potential bio-derived platform chemical for the detergent/surfactant, ion chelator, food and pharmaceutical markets. Until now, much research was undertaken to lower the production costs of bio-succinic acid, however a multicriteria sustainability evaluation of established and upcoming production processes from a technical perspective is still lacking in the scientific literature. In this study, we combine metabolic engineering with the most mature technologies for the production of bio-succinic acid from sugar beet and lignocellulosic residues. Downstream technologies such as reactive extraction, electrodialysis and ion exchange are investigated together with different upstream technologies such as neutral pH level-, acidic- and high sugar fermentation including metabolically engineered E. coli strains. Different biorefinery concepts are evaluated considering technical, economic, environmental and process hazard aspects in order to gain a broad sustainability perspective of the technologies. The results reveal that energy integration is a key factor for biorefinery concepts in order to be economically reasonable and to achieve lower environmental impacts compared to the conventional production from non-renewable resources. It was found that metabolically engineered E. coli with resistance at the acidic pH level in the fermentation together with reactive extraction in the purification presents the most environmentally competitive technology. However, E. coli strains with resistance at high sugar concentrations together with reactive extraction are revealed to present the most economically competitive technology for the production of bio-succinic acid. Moreover, both technologies are flagged for higher process hazards and require the right measures to enhance process safety and mitigate environmental loads and worker exposure.
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- Piementel, Tiago, et al.
(author)
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SIGMORPHON 2021 Shared Task on Morphological Reinflection: Generalization Across Languages
- 2021
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In: Proceedings of the 18th SIGMORPHON Workshop on Computational Research in Phonetics, Phonology, and Morphology. August 2021, Online, pp. 229–259. - : Special Interest Group on Computational Morphology and Phonology.
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Conference paper (peer-reviewed)abstract
- This year’s iteration of the SIGMORPHON Shared Task on morphological reinflection focuses on typological diversity and cross- lingual variation of morphosyntactic features. In terms of the task, we enrich UniMorph with new data for 32 languages from 13 language families, with most of them be- ing under-resourced: Kunwinjku, Classical Syriac, Arabic (Modern Standard, Egyptian, Gulf), Hebrew, Amharic, Aymara, Magahi, Braj, Kurdish (Central, Northern, Southern), Polish, Karelian, Livvi, Ludic, Veps, Võro, Evenki, Xibe, Tuvan, Sakha, Turkish, In- donesian, Kodi, Seneca, Asháninka, Yanesha, Chukchi, Itelmen, Eibela. We evaluate six systems on the new data and conduct an extensive error analysis of the systems’ predictions. Transformer-based models generally demonstrate superior performance on the majority of languages, achieving >90% accuracy on 65% of them. The languages on which systems yielded low accuracy are mainly underresourced, with a limited amount of data. Most errors made by the systems are due to allomorphy, honorificity, and form variation. In addition, we observe that systems especially struggle to inflect multiword lemmas. The systems also produce misspelled forms or end up in repetitive loops (e.g., RNN-based models). Finally, we report a large drop in systems’ performance on previously unseen lemmas.
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- Isvoranu, Cristina, et al.
(author)
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Tuning the spin state of iron phthalocyanine by ligand adsorption
- 2010
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In: Journal of Physics: Condensed Matter. - : IOP Publishing. - 1361-648X .- 0953-8984. ; 22:47
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Journal article (peer-reviewed)abstract
- The future use of single-molecule magnets in applications will require the ability to control and manipulate the spin state and magnetization of the magnets by external means. There are different approaches to this control, one being the modification of the magnets by adsorption of small ligand molecules. In this paper we use iron phthalocyanine supported by an Au(111) surface as a model compound and demonstrate, using x-ray photoelectron spectroscopy and density functional theory, that the spin state of the molecule can be tuned to different values (S similar to 0, 1/2, 1) by adsorption of ammonia, pyridine, carbon monoxide or nitric oxide on the iron ion. The interaction also leads to electronic decoupling of the iron phthalocyanine from the Au(111) support.
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