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Publications

Publications by CRIIS

2021

Optimising grapevine summer stress responses and hormonal balance by applying kaolin in two Portuguese Demarcated Regions

Authors
Bernardo, S; Dinis, LT; Luzio, A; Machado, N; Goncalves, A; Vives Peris, V; Pitarch Bielsa, M; Lopez Climent, MF; Malheiro, AC; Correia, C; Gomez Cadenas, A; Moutinho Pereira, J;

Publication
OENO ONE

Abstract
In Mediterranean-like climate areas, field-grown grapevines are typically exposed to severe environmental conditions during the summer season, which can negatively impact the sustainability of viticulture. Despite the short-term mitigation strategies available nowadays to cope with climate change, little is known regarding their effectiveness in different demarcated winegrowing regions with differing climate features. Hence, we applied a kaolin suspension (5 %) to Touriga-Franca (TF) and Touriga-Nacional (TN) grapevine varieties located in two Portuguese demarcated regions (Alentejo and Douro) with different mesoclimates to study its effect on the physiological performance, hormonal balance and ABA-related grapevine leaf gene expression during the 2017 and 2018 growing seasons. Data show that 2017 was warmer than 2018 due to the occurrence of two heatwaves in both locations, highlighting the protective effect of kaolin application under severe environmental conditions. In the first study year, at midday, kaolin enhanced water use efficiency (23 % in Douro and 13 % in Alentejo), carbon assimilation rates (PN; 72 % in Douro and 25 % in Alentejo), and the soluble sugar content of grapevine leaves, while decreasing the accumulation of plant growth regulators (ABA, IAA, and SA) during the ripening stage. The results show an up-regulation of ABA biosynthesis-related genes (VvNCED) in TF treated vines from the Douro vineyard mainly in 2017, suggesting an increased stress response under severe summer conditions. Additionally, kaolin triggered the expression of ABA-responsive genes (VvHVA22a and VvSnRK2.6) mainly in TF, indicating different varietal responses to kaolin application under fluctuating periods of summer stress.

2021

COMPARATIVE ANALYSIS OF FOUR QGIS PLUGINS FOR WEB MAPS CREATION

Authors
Duarte, L; Queiros, C; Teodoro, AC;

Publication
GRANJA-REVISTA DE CIENCIAS DE LA VIDA

Abstract
QGIS is a free and open-source software that allows viewing, editing, and analyzing georeferenced data. It is a Geographic Information System (GIS) software composed by tools that allow to manipulate geographic information and consequently to create maps which help to get a better understanding and organization of geospatial data. Unfortunately, maps created directly in the GIS desktop software are not automatically transferred to a website. This research aimed to compare publishing capabilities in different QGIS plugins to create Web Maps. This study analyzes four QGIS plugins (QGIS2Web, QGIS Cloud, GIS Cloud Publisher and Mappia Publisher), performing a comparison between them, considering their advantages and disadvantages, the free and subscription plans, the tools offered by each plugin and other generic aspects. The four plugins were tested in a specific case study to automatically obtain different Web Maps. This study could help users to choose the most adequate tools to publish Web Maps under QGIS software.

2021

Multidimensional Ln-Aminophthalate Photoluminescent Coordination Polymers

Authors
Queiros, C; Sun, C; Silva, AMG; de Castro, B; Cabanillas Gonzalez, J; Cunha Silva, L;

Publication
MATERIALS

Abstract
The development of straightforward reproducible methods for the preparation of new photoluminescent coordination polymers (CPs) is an important goal in luminescence and chemical sensing fields. Isophthalic acid derivatives have been reported for a wide range of applications, and in addition to their relatively low cost, have encouraged its use in the preparation of novel lanthanide-based coordination polymers (LnCPs). Considering that the photoluminescent properties of these CPs are highly dependent on the existence of water molecules in the crystal structure, our research efforts are now focused on the preparation of CP with the lowest water content possible, while considering a green chemistry approach. One- and two-dimensional (1D and 2D) LnCPs were prepared from 5-aminoisophthalic acid and Sm3+/Tb3+ using hydrothermal and/or microwave-assisted synthesis. The unprecedented LnCPs were characterized by single-crystal X-ray diffraction (SCRXD), powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM), and their photoluminescence (PL) properties were studied in the solid state, at room temperature, using the CPs as powders and encapsulated in poly(methyl methacrylate (PMMA) films, envisaging the potential preparation of devices for sensing. The materials revealed interesting PL properties that depend on the dimensionality, metal ion, co-ligand used and water content.

2021

Amination of Cyclohexanol over a Ni-Based Catalyst - Part II: Catalyst Stability and Reaction Pathway

Authors
Churro, R; Mendes, F; Araujo, P; Ribeiro, MF; Madeira, LM;

Publication
CHEMICAL ENGINEERING & TECHNOLOGY

Abstract
Ni-based catalysts present a highly interesting performance for the reductive amination of cyclohexanol (CHOL). The stability of a commercial Ni-based catalyst was evaluated and a high stability over the tested time-on-stream (TOS) was observed. The reaction network was evaluated by analysis of selectivity profiles as a function of CHOL conversion. The formation of cyclohexylamine (CHA) was found to be consistent with the proposed borrowing hydrogen method (BHM). The formation of heavy-end (HE) by-products also follows the BHM pathway as parallel reaction. The effect of individual molar proportions of NH3 and H-2 was evaluated. It was found that when H-2 is present in a high excess, side reactions were favored, but its presence is mandatory towards keeping the catalyst active.

2021

Reversible Protonation of Porphyrinic Metal-Organic Frameworks Embedded in Nanoporous Polydimethylsiloxane for Colorimetric Sensing

Authors
Sousaraei, A; Queiros, C; Moscoso, FG; Silva, AMG; Lopes Costa, T; Pedrosa, JM; Cunha Silva, L; Cabanillas Gonzalez, J;

Publication
ADVANCED MATERIALS INTERFACES

Abstract
A fast and reversible switch between the neutral and protonated porphyrin forms inside a pliable porphyrinic metal-organic framework (MOF), enabled by reversible structural deformation is unveiled. This phenomenon is applied for the development of MOF-polymer porous composites to reveal biogenic amines by color changes.

2021

Synthesis, characterization, and cellular investigations of porphyrin-and chlorin-indomethacin conjugates for photodynamic therapy of cancer

Authors
Almeida, J; Zhang, GY; Wang, MD; Queiros, C; Cerqueira, AFR; Tome, AC; Barone, G; Vicente, MGH; Hey Hawkins, E; Silva, AMG; Rangel, M;

Publication
ORGANIC & BIOMOLECULAR CHEMISTRY

Abstract
Indomethacin is a potent non-steroidal anti-inflammatory drug (NSAID) with a strong selective inhibitor activity towards cyclooxygenase-2 (COX-2), an enzyme that is highly overexpressed in various tumour cells, being involved in tumourigenesis. Concomitantly, porphyrins have gained much attention as promising photosensitizers (PSs) for the non-invasive photodynamic therapy (PDT) of cancer. Herein, we report the design, and determine the singlet oxygen generation capacity and in vitro cellular toxicity of porphyrin.- and chlorin-indomethacin conjugates (P2-Ind and C2-Ind). Both the conjugates were obtained in high yields and were characterized by H-1, F-19 and C-13 NMR as well as by high resolution mass spectrometry. The singlet oxygen generation properties were assessed by the 1,3-diphenylisobenzofuran singlet oxygen trap method, which showed that C2 and C2-Ind are the best singlet oxygen photosensitizers. in addition, it was found that the presence of indomethacin did not influence the singlet oxygen generation of porphyrin or chlorin. Cytotoxicity studies of the conjugate in human HEp2 cells revealed that the porphyrin ... and chlorin- indomethacin conjugates have similar dark cytotoxicities, while chlorin C2 was shown to be the most phototoxic. Despite having lower cellular uptake than C2-Ind after 24 hours, chlorin C2 had a broad localization in HEp2 cells while the chlorin-indomethacin conjugate C2-Ind could be detected in the form of small aggregates. DFT calculations were performed to shed light on the reaction energy involved in the formation of the indomethacin conjugates and to compare the relative stability of selected isomers in solution. Moreover, the calculated energy of their first excited triplet state structures confirmed their use as suitable photosensitizers to generate singlet oxygen for PDT.

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