About University of Rome Tor Vergata

University of Rome Tor Vergata

Articles by University of Rome Tor Vergata

Chlorophylls and xanthophylls of crop plants as dyes for Dye-Sensitized Solar Cells (DSSC)

Published on: 11th October, 2017

OCLC Number/Unique Identifier: 7286354251

Natural dyes have become a viable alternative to expensive and rare organic sensitizers because of their low cost, easy attainability, abundance of supply of raw materials and environmental friendliness. Chlorophyll, the most abundant pigment, can be extracted from plant leaves with simple and inexpensive methods, but it’s difficult to use as a Dye-Sensitized Solar Cells (DSSC) sensitizer due to the absence of OH and COOH groups. The opposite is true for xanthophylls, a particular class of carotenoids that contain free hydroxyl groups and thus may be considered as potential DSSC sensitizers. In this work we describe a new and inexpensive method of chlorophyll extraction from leaves based on the use of a basic solvent that provides the creation of COOH groups, allowing chlorophyll binding on the TiO2 layer. This modified chlorophyll dye showed a higher DSSC efficiency level (0.72%) compared to xanthophylls, which had lower efficiency.
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Bilateral Trigeminal Neuralgia Refractory to Medical Therapy: Importance of A Multi-Therapeutic Approach

Published on: 10th January, 2025

Bilateral trigeminal neuralgia refractory to medical therapy is a rare occurrence and it is mandatory to choose therapeutic procedures minimizing possible bilateral sensitive deficit due to the employment of bilateral mininvasive ablative techniques.  A patient affected by bilateral trigeminal neuralgia refractory to medical therapy secondary to multiple sclerosis is presented. Multiple therapeutic tools were employed in this challenging pathology. The second and third left trigeminal divisions were involved by the neuralgia, while the third division was involved in the right facial side. Controlled radiofrequency thermocoagulation was employed for the isolated right third division, then radiosurgery was conducted for the left hemifacial side.  After one month, because of the persistence of pain attacks of the left second trigeminal division, peripheral authorizations were performed. Control of pain, with the withdrawal of medical therapy (BNI scale class I), was achieved in this patient with a multi-therapeutic approach. Radiofrequency thermorizotomy was performed for the right third division because neuralgia was very acute, and immediate pain relief was achieved. Pain in the left third trigeminal division regressed after radiosurgery, while pain in the left second division continued after radiosurgery, then peripheral alcoholization was performed with pain control.Bilateral trigeminal neuralgia refractory to medical therapy should be treated by the dedicated neurosurgeon, avoiding bilateral ablative techniques for the same division and using neurosurgical techniques according to the trigeminal division interested by the neuralgia and according to the intensity of pain.
Cite this ArticleCrossMarkPublonsHarvard Library HOLLISGrowKudosResearchGateBase SearchOAI PMHAcademic MicrosoftScilitSemantic ScholarUniversite de ParisUW LibrariesSJSU King LibrarySJSU King LibraryNUS LibraryMcGillDET KGL BIBLiOTEKJCU DiscoveryUniversidad De LimaWorldCatVU on WorldCat
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