Vitamin C dietary supplementation influence tadpoles of bullfrog Lithobates catesbeianus reared in low water temperature

A suplementação de vitamina C é importante para o crescimento e desenvolvimento de girinos de rã-touro sob condições ótimas de temperatura da água. Desta forma, foi realizado um experimento para avaliar o efeito da suplementação de vitamina C sobre a dieta de girinos de rã-touro em baixa temperatura. O experimento foi realizado com 480 girinos com peso médio de 0,078g, distribuídos em 12 aquários com 40L de água em sistema fechado de recirculação de água. O delineamento experimental foi inteiramente casualizado, com quatro tratamentos (0, 150, 300 e 600 mg kg-1 de monofosfato de ácido L-ascórbico) e três repetições. O desempenho produtivo foi avaliado por meio de ganho de peso, conversão alimentar, consumo de ração, eficiência proteica, rendimento de carcaça, índice hepatossomático, índice viscerossomático, índice de gordura visceral, matéria seca e extrato etéreo de carcaça. A temperatura da água durante o período experimental foi de 21,74 ± 0,43 °C. A suplementação com vitamina C não influenciou o rendimento de carcaça e o índice viscerossomático. No entanto, houve efeito quadrático da suplementação com vitamina C sobre o ganho de peso, a conversão alimentar aparente, a eficiência protéica, o índice de gordura visceral, o índice hepatossomático e o extrato etéreo de carcaça. Com base nos resultados do presente estudo, os girinos de rã-touro devem ser suplementados com 600 mg vitamina C kg-1 da dieta quando submetidos em temperaturas médias de 22 °C.Vitamin C supplementation is important for the growth and development of bullfrog tadpoles under optimum water temperature conditions. Therefore, an experiment was carried out to evaluate the effects of vitamin C supplementation on the diet of bullfrog tadpoles at a low temperature. A total of 480 tadpoles with a mean weight of 0.078 g were distributed in 12 aquariums each containing 40 L of water in a closed water recirculation system. The experimental design was entirely randomized with four treatments (0, 150, 300, and 600 mg kg-1 of L-ascorbic acid monophosphate) and three replicates. The productive performance was measured by the weight gain, feed conversion, diet consumption, protein efficiency, carcass yield, hepatosomatic index, viscerosomatic index, visceral fat index, dry matter, and ethereal carcass extract. The water temperature during the experimental period was 21.74 ± 0.43 °C. Vitamin C supplementation did not influence carcass yield and viscerosomatic index. However, there was a quadratic effect of vitamin C supplementation on the weight gain, apparent feed conversion, protein efficiency, visceral fat index, hepatosomatic index, and ethereal carcass extract. Based on these results, bullfrog tadpoles should be supplemented with 600 mg vitamin C kg-1 of the diet when subjected to water temperatures of around 22 °C

In the game of adjustments: questions about memory construction in interviews

Reflexão teórico-metodológica em torno do uso da entrevista na recolha de relatos orais em dois estudos que cruzam perspetivas no campo da comunicação no espaço ibero-americano (Portugal e Brasil).N/

Molecular Mechanisms Of Glucose Uptake In Skeletal Muscle At Rest And In Response To Exercise

Glucose uptake is an important phenomenon for cell homeostasis and for organism health. Under resting conditions, skeletal muscle is dependent on insulin to promote glucose uptake.Insulin, after binding to its membrane receptor, triggers a cascade of intracellular reactions culminating in activation of the glucose transporter 4, GLUT4, among other outcomes.This transporter migrates to the plasma membrane and assists in glucose internalization.However, under special conditions such as physical exercise, alterations in the levels of intracellular molecules such as ATP and calcium actto regulate GLUT4 translocation and glucose uptake in skeletal muscle, regardless of insulinlevels.Regular physical exercise, due to stimulating pathways related to glucose uptake, is an important non-pharmacological intervention for improving glycemic control in obese and diabetic patients. In this mini-review the main mechanisms involved in glucose uptake in skeletal muscle in response to muscle contraction will be investigated.23especia

Photocatalytic Activity of TiO2 Nanostructured Arrays Prepared by Microwave-Assisted Solvothermal Method

The use of metal-oxide-semiconductor nanostructures as photocatalytic materials has been an area of intense research over the last decade, and in this field, titanium dioxide (TiO2) receives much attention. TiO2 is an attractive material since it is stable, insoluble, non-toxic, resistant to corrosion and relatively inexpensive. In this chapter, we will demonstrate the influence of different solvents on the synthesis of TiO2 nanostructures considering a solvothermal method assisted by microwave radiation and their photocatalytic behaviour. The TiO2 nanostructured arrays were synthesized on seeded polyethylene naphthalate (PEN) substrates with different solvents: water, 2 – propanol, ethanol and methanol. TiO2 thin films deposited by spin-coating were used as seed layer for the nanostructures growth. Structural characterization of the microwave synthesized materials has been carried out by scanning electron microscopy (SEM) and X-Ray diffraction (XRD). The optical properties have also been investigated. The TiO2 nanostructures arrays were tested as photocatalytic agents in the degradation of pollutant dyes like methylene blue (MB) in the presence of UV radiation. Expressive differences between the different solvents were detected, in which methanol demonstrated higher MB degradation for the conditions tested

Foldable and Recyclable Iontronic Cellulose Nanopaper for Low-Power Paper Electronics

Nanomodelling and Nanofabrication – i3N, project CHIHC, reference PTDC/NAN‐MAT/32558/2017, project CELLECTIVE, reference PTDC/CTM‐CTM/4653/2021, The authors would also like to thank their colleagues Daniela Gomes, Ana Pimentel, Sónia Pereira and Tomás Calmeiro from CENIMAT/i3N for the SEM, DSC‐TGA, XRD and AFM measurements, respectively.An increase in the demand for the next generation of “Internet-of-Things” (IoT) has motivated efforts to develop flexible and affordable smart electronic systems, in line with sustainable development and carbon neutrality. Cellulose holds the potential to fulfil such demands as a low-cost green material due to its abundant and renewable nature and tunable properties. Here, a cellulose-based ionic conductive substrate compatible with printing techniques that combines the mechanical robustness, thermal resistance and surface smoothness of cellulose nanofibrils nanopaper with the high capacitance of a regenerated cellulose hydrogel electrolyte, is reported. Fully screen-printed electrolyte-gated transistors and universal logic gates are demonstrated using the engineered ionic conductive nanopaper and zinc oxide nanoplates as the semiconductor layer. The devices exhibit low-voltage operation (<3 V), and remarkable mechanical endurance under outward folding due to the combination of the robustness of the nanopaper and the compliance of the semiconductor layer provided by the ZnO nanoplates. The printed devices and the ion-conductive nanopaper can be efficiently recycled to fabricate new devices, which is compatible with the circular economy concept.publishersversionpublishe

Enquadramentos de mulheres médio-orientais na imprensa: uma análise dos jornais O Globo e Folha de S. Paulo

The article aims to identify and discuss the journalistic framings about Middle Eastern women in the Brazilian press. Our corpus consists of articles published by the newspapers Folha de S. Paulo and O Globo, between January 1 and May 31, 2018. We articulate the concept of Orientalism proposed by Edward Said to gender studies developed mainly by Maryam Khalid, Hamideh Sedghi and Azadeh Kian-Thiébaut, understanding how Orientalist conceptions operate in journalistic narratives. The methodology applied was Content Analysis, in its thematic-category modality. We identified that the narratives are anchored in the idea of westernization of the region, in which women are shown towards a transition to the idealization of modernity, but still linked to traditionally orientalist conceptions.O artigo tem como objetivo identificar e discutir os enquadramentos jornalísticos acerca de mulheres médio-orientais na imprensa brasileira. Nosso corpus constitui-se de matérias veiculadas pelos jornais Folha de S. Paulo e O Globo, entre 01 de janeiro e 31 de maio de 2018. Articulamos o conceito de Orientalismo proposto por Edward Said aos estudos de gênero desenvolvidos sobretudo por Maryam Khalid, Hamideh Sedghi e Azedah Kian-Thiébaut, compreendendo como concepções orientalistas operam nas narrativas jornalísticas. A metodologia aplicada foi a Análise de Conteúdo, em sua modalidade temático-categorial. Identificamos que as narrativas estão ancoradas na ideia de ocidentalização da região, na qual as mulheres são exibidas em direção a uma transição para a idealização de modernidade, mas ainda vinculadas a concepções tradicionalmente orientalistas

Cellulose-Based Solid Electrolyte Membranes Through Microwave Assisted Regeneration and Application in Electrochromic Displays

European Commission under project NewFun (ERC-StG-2014, GA 640598) and BET-EU (H2020-TWINN-2015, GA 692373). FEDER funds through the COMPETE 2020 Program and the National Funds through the FCT - Portuguese Foundation for Science and Technology under the Project No. POCI-01-0145-FEDER-007688, project PapEl, reference PTDC/CTM-NAN/5172/2014 and project CHIHC, reference PTDC/NAN-MAT/32558/2017.One of the most current trends in applied electrochemistry is the development of solid ionic conductors with electrical, mechanical, and optical properties tailored for a specific functional application. Moreover, particular interest exists in materials with low environmental impact and low cost where matters such as sustainability and recyclability are considered. In this study, these concerns were considered by developing a solid-state electrolyte based on regenerated cellulose that meets the requirements for application in electrochromic devices. This soft-matter electrolyte exhibits particularly high room temperature ionic conductivity in the range of 6.5 mS cm–1 and Young’s modulus in the range 3.7 GPa. Optimized electrolyte membranes were applied to inorganic optically active films resulting in all-solid-state electrochromic devices with performances reaching a practical level, retaining its optical modulation characteristics after hundreds of cycles.publishersversionpublishe

Uv-responsive screen-printed porous zno nanostructures on office paper for sustainable and foldable electronics

Funding Information: This work is funded by National Funds through FCT?Portuguese Foundation for Science and Technology, reference UIDB/50025/2020-2023 and FCT/MCTES. This work also received funding from the European Community?s H2020 program under grant agreement No. 787410 (ERC-2018-AdG DIGISMART), No. 640598 (ERC-StG-2014, NEWFUN), and No. 952169 (SYNERGY, H2020-WIDESPREAD-2020-5, CSA). S.H.F. acknowledges the Portuguese Foundation for Science and Technology for the AdvaMTech PhD program scholarship PD/BD/114086/2015 and IDS-FunMat-INNO project FPA2016/EIT/EIT RawMaterials Grant Agreement 17184. I.C. acknowledges the Portuguese Foundation for Science and Technology for the PhD scholarship SFRH/BD/126409/2016. Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.The fabrication of low-cost, flexible, and recyclable electronic devices has been the focus of many research groups, particularly for integration in wearable technology and the Internet of Things (IoT). In this work, porous zinc oxide (ZnO) nanostructures are incorporated as a UV sensing material into the composition of a sustainable water-based screen-printable ink composed of car-boxymethyl cellulose (CMC). The formulated ink is used to fabricate flexible and foldable UV sensors on ubiquitous office paper. The screen-printed CMC/ZnO UV sensors operate under low voltage (≤2 V) and reveal a stable response over several on/off cycles of UV light exposure. The devices reach a response current of 1.34 ± 0.15 mA and a rise and fall time of 8.2 ± 1.0 and 22.0 ± 2.3 s, respectively. The responsivity of the sensor is 432 ± 48 mA W−1, which is the highest value reported in the literature for ZnO-based UV sensors on paper substrates. The UV-responsive devices display impressive mechanical endurance under folding, showing a decrease in responsivity of only 21% after being folded 1000 times. Their low-voltage operation and extreme folding stability indicate a bright future for low-cost and sustainable flexible electronics, showing potential for low-power wearable applications and smart packaging.publishersversionpublishe

Sobre a teoria de análise de dados/ About data analysis theory

Apresentamos as condições iniciais para a  análise de dados do ponto de vista matemático, sendo este o conteúdo inicial para a análise topológica de dados, abordando parte da teoria básica e aplicando-a em certos problemas