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| 2. |
- Albornoz-Palma, Gregory, et al.
(author)
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Relationship between rheological and morphological characteristics of cellulose nanofibrils in dilute dispersions
- 2019
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In: Carbohydrate Polymers. - : Elsevier Ltd. - 0144-8617 .- 1879-1344.
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Journal article (peer-reviewed)abstract
- The morphology of cellulose nanofibrils (CNFs), the rheological characteristics of their dispersions, and the corresponding relationships, are fundamental for understanding the properties of the material. This work aims at understanding how the morphological characteristics of the CNFs affect the rheology of the dispersions in the dilute region and to establish a relationship between both properties. A strong relationship was observed between the intrinsic viscosity of the CNF dispersions and their aspect ratio, which can be correlated through the expression ρ[η]=0.051p1.85. When comparing the model obtained in this work to the wormlike chain model, it was possible to verify that these models are independent of the flexibility of the CNFs. Regarding the fibrillation process, the dynamic viscosity only reflects part of the behavior of the morphological properties of the CNFs and does not provide reliable data that would allow these characteristics to be inferred, while the intrinsic viscosity does allow this relationship.
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| 3. |
- Barazzoni, Rocco, et al.
(author)
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Guidance for assessment of the muscle mass phenotypic criterion for the Global Leadership Initiative on Malnutrition (GLIM) diagnosis of malnutrition
- 2022
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In: Clinical Nutrition. - : Elsevier. - 0261-5614 .- 1532-1983. ; 41:6, s. 1425-1433
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Journal article (peer-reviewed)abstract
- The Global Leadership Initiative on Malnutrition (GLIM) provides consensus criteria for the diagnosis of malnutrition that can be widely applied. The GLIM approach is based on the assessment of three phenotypic (weight loss, low body mass index, and low skeletal muscle mass) and two etiologic (low food intake and presence of disease with systemic inflammation) criteria, with diagnosis confirmed by any combination of one phenotypic and one etiologic criterion fulfilled. Assessment of muscle mass is less commonly performed than other phenotypic malnutrition criteria, and its interpretation may be less straightforward, particularly in settings that lack access to skilled clinical nutrition practitioners and/or to body composition methodologies. In order to promote the widespread assessment of skeletal muscle mass as an integral part of the GLIM diagnosis of malnutrition, the GLIM consortium appointed a working group to provide consensus-based guidance on assessment of skeletal muscle mass. When such methods and skills are available, quantitative assessment of muscle mass should be measured or estimated using dual-energy x-ray absorptiometry, computerized tomography, or bioelectrical impedance analysis. For settings where these resources are not available, then the use of anthropometric measures and physical examination are also endorsed. Validated ethnic-and sex-specific cutoff values for each measurement and tool are recommended when available. Measurement of skeletal muscle function is not advised as surrogate measurement of muscle mass. However, once malnutrition is diagnosed, skeletal muscle function should be investigated as a relevant component of sarcopenia and for complete nutrition assessment of persons with malnutrition. (c) 2022 Elsevier Ltd. and European Society for Clinical Nutrition and Metabolism and American Society for Parenteral and Enteral Nutrition. All rights reserved.
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| 4. |
- Barbudo Carrasco, Lais, 1988-
(author)
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Integração de conteúdos culturais heterogêneos em ambientes digitais do patrimônio cultural : harmonização de modelos conceituais
- 2019
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Doctoral thesis (other academic/artistic)abstract
- Em decorrência da rápida difusão de informação em ambientes web, o acesso e a recuperação da informação de sistemas heterogêneos integrados estão se tornando cada vez mais relevantes. O problema de pesquisa circundante é que os acervos digitais de patrimônio cultural, contidos, por exemplo, em bibliotecas, arquivos e museus – utilizam diferentes padrões o que dificultam a integração entre eles. Diante desta premissa, tem-se a seguinte pergunta de pesquisa: é possível desenvolver uma harmonização de modelos conceituais existentes do patrimônio cultural, na perspectiva da integração de conteúdos culturais heterogêneos em ambientes digitais? Assim, a pesquisa propõe o desenvolvimento de uma harmonização de modelos conceituais para a integração de conteúdos culturais heterogêneos digitais de acervos de arquivos, bibliotecas e museus. O objetivo geral desta pesquisa é desenvolverum processo de harmonização de modelos conceituais do patrimônio cultural, na perspectiva da integração de conteúdos culturais heterogêneos em ambientes digitais. A pesquisa é de natureza, teórica e aplicada, e também classificada como exploratória. Alguns projetos e iniciativas internacionais são analisados: CIDOC CRM do ICOM (Modelo de Referência Conceitual), FRBR da IFLA (Requisitos Funcionais para Registros Bibliográficos), RiC da ICA (Modelo de Descrição Arquivística Records in Contexts), EDM da Europeana (Modelo de Dados da Europeana) e o CRMgeo do OCG (Modelo de Descrição Geoespacial). A tese da pesquisa consiste em afirmar que a harmonização dos modelos conceituais do patrimônio cultural possibilita a integração de conteúdos culturais heterogêneos em ambientes digitais. Os resultados apresentam um processo de harmonização de modelos conceituais do patrimônio cultural mediante um mapeamento terminológico-conceitual, delineamento de categorias e as correspondências das entidades de tais modelos. Portanto, aharmonização dos modelos conceituais possibilita integrar sistemas heterogêneos de acervos de arquivos, bibliotecas e museus em ambientes digitais, proporcionando aos usuários destes ambientes, uma recuperação de conteúdos culturais contextualizados, com caráter dinâmico e semântico, por meio da ampliação dos dados culturais.
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| 5. |
- Bustin, Stephen A., et al.
(author)
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The need for transparency and good practices in the qPCR literature
- 2013
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In: Nature Methods. - : Springer Science and Business Media LLC. - 1548-7091 .- 1548-7105. ; 10:11, s. 1063-1067
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Journal article (other academic/artistic)abstract
- Two surveys of over 1,700 publications whose authors use quantitative real-time PCR (qPCR) reveal a lack of transparent and comprehensive reporting of essential technical information. Reporting standards are significantly improved in publications that cite the Minimum Information for Publication of Quantitative Real-Time PCR Experiments (MIQE) guidelines, although such publications are still vastly outnumbered by those that do not.
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| 6. |
- Chinga-Carrasco, Gary, et al.
(author)
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Bagasse—A major agro-industrial residue as potential resource for nanocellulose inks for 3D printing of wound dressing devices
- 2019
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In: Additive Manufacturing. - : Elsevier B.V.. - 2214-8604 .- 2214-7810. ; 28, s. 267-274
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Journal article (peer-reviewed)abstract
- Sugarcane bagasse, an abundant residue, is usually burned as an energy source. However, provided that appropriate and sustainable pulping and fractionation processes are applied, bagasse can be utilized as a main source of cellulose nanofibrils (CNF). We explored in this study the production of CNF inks for 3D printing by direct-ink-writing technology. The CNF were tested against L929 fibroblasts cell line and we confirmed that the CNF from soda bagasse fibers were found not to have a cytotoxic potential. Additionally, we demonstrated that the alginate and Ca 2+ caused significant dimensional changes to the 3D printed constructs. The CNF-alginate grids exhibited a lateral expansion after printing and then shrank due to the cross-linking with the Ca 2+ . The release of Ca 2+ from the CNF and CNF-alginate constructs was quantified thus providing more insight about the CNF as carrier for Ca 2+ . This, combined with 3D printing, offers potential for personalized wound dressing devices, i.e. tailor-made constructs that can be adapted to a specific shape, depending on the characteristics of the wound healing treatment.
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| 7. |
- Chinga-Carrasco, Gary, et al.
(author)
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Pulping and Pretreatment Affect the Characteristics of Bagasse Inks for Three-dimensional Printing
- 2018
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In: ACS Sustainable Chemistry and Engineering. - : American Chemical Society (ACS). - 2168-0485. ; 6:3, s. 4068-4075
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Journal article (peer-reviewed)abstract
- Bagasse is an underutilized agro-industrial residue with great potential as raw material for the production of cellulose nanofibrils (CNF) for a range of applications. In this study, we have assessed the suitability of bagasse for production of CNF for three-dimensional (3D) printing. First, pulp fibers were obtained from the bagasse raw material using two fractionation methods, i.e. soda and hydrothermal treatment combined with soda. Second, the pulp fibers were pretreated by TEMPO-mediated oxidation using two levels of oxidation for comparison purposes. Finally, the CNF were characterized in detail and assessed as inks for 3D printing. The results show that CNF produced from fibers obtained by hydrothermal and soda pulping were less nanofibrillated than the corresponding material produced by soda pulping. However, the CNF sample obtained from soda pulp was cytotoxic, apparently due to a larger content of silica particles. All the CNF materials were 3D printable. We conclude that the noncytotoxic CNF produced from hydrothermally and soda treated pulp can potentially be used as inks for 3D printing of biomedical devices.
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| 8. |
- Compher, Charlene, et al.
(author)
-
Guidance for assessment of the muscle mass phenotypic criterion for the Global Leadership Initiative on Malnutrition diagnosis of malnutrition
- 2022
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In: JPEN - Journal of Parenteral and Enteral Nutrition. - : John Wiley & Sons. - 0148-6071 .- 1941-2444. ; 46:6, s. 1232-1242
-
Journal article (peer-reviewed)abstract
- The Global Leadership Initiative on Malnutrition (GLIM) provides consensus criteria for the diagnosis of malnutrition that can be widely applied. The GLIM approach is based on the assessment of three phenotypic (weight loss, low body mass index, and low skeletal muscle mass) and two etiologic (low food intake and presence of disease with systemic inflammation) criteria, with diagnosis confirmed by any combination of one phenotypic and one etiologic criterion fulfilled. Assessment of muscle mass is less commonly performed than other phenotypic malnutrition criteria, and its interpretation may be less straightforward, particularly in settings that lack access to skilled clinical nutrition practitioners and/or to body composition methodologies. In order to promote the widespread assessment of skeletal muscle mass as an integral part of the GLIM diagnosis of malnutrition, the GLIM consortium appointed a working group to provide consensus-based guidance on assessment of skeletal muscle mass. When such methods and skills are available, quantitative assessment of muscle mass should be measured or estimated using dual-energy x-ray absorptiometry, computerized tomography, or bioelectrical impedance analysis. For settings where these resources are not available, then the use of anthropometric measures and physical examination are also endorsed. Validated ethnic- and sex-specific cutoff values for each measurement and tool are recommended when available. Measurement of skeletal muscle function is not advised as surrogate measurement of muscle mass. However, once malnutrition is diagnosed, skeletal muscle function should be investigated as a relevant component of sarcopenia and for complete nutrition assessment of persons with malnutrition.
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| 9. |
- Ehman, Nanci Vanesa, et al.
(author)
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Biocomposites of Bio-Polyethylene Reinforced with a Hydrothermal-Alkaline Sugarcane Bagasse Pulp and Coupled with a Bio-Based Compatibilizer.
- 2020
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In: Molecules. - : MDPI AG. - 1431-5157 .- 1420-3049. ; 25:9
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Journal article (peer-reviewed)abstract
- Bio-polyethylene (BioPE, derived from sugarcane), sugarcane bagasse pulp, and two compatibilizers (fossil and bio-based), were used to manufacture biocomposite filaments for 3D printing. Biocomposite filaments were manufactured and characterized in detail, including measurement of water absorption, mechanical properties, thermal stability and decomposition temperature (thermo-gravimetric analysis (TGA)). Differential scanning calorimetry (DSC) was performed to measure the glass transition temperature (Tg). Scanning electron microscopy (SEM) was applied to assess the fracture area of the filaments after mechanical testing. Increases of up to 10% in water absorption were measured for the samples with 40 wt% fibers and the fossil compatibilizer. The mechanical properties were improved by increasing the fraction of bagasse fibers from 0% to 20% and 40%. The suitability of the biocomposite filaments was tested for 3D printing, and some shapes were printed as demonstrators. Importantly, in a cradle-to-gate life cycle analysis of the biocomposites, we demonstrated that replacing fossil compatibilizer with a bio-based compatibilizer contributes to a reduction in CO2-eq emissions, and an increase in CO2 capture, achieving a CO2-eq storage of 2.12 kg CO2 eq/kg for the biocomposite containing 40% bagasse fibers and 6% bio-based compatibilizer.
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| 10. |
- Espinosa, Eduardo, et al.
(author)
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PVA/(ligno)nanocellulose biocomposite films. Effect of residual lignin content on structural, mechanical, barrier and antioxidant properties
- 2019
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In: International Journal of Biological Macromolecules. - : Elsevier B.V.. - 0141-8130 .- 1879-0003. ; 141, s. 197-206
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Journal article (peer-reviewed)abstract
- Nanocelluloses with and without residual lignin were isolated from wheat straw. In addition, the effect of TEMPO-mediated oxidation on the production of lignin-containing nanocellulose was studied. The different nanocelluloses were used as reinforcing agent in Poly(vinyl alcohol) films. The morphology, crystallinity, surface microstructure, barrier properties, light transmittance, mechanical and antioxidant properties were evaluated. The translucency of films was reduced by the addition of nanocellulose, however, the ability to block UV-light increased from 10% for PVA to >50% using lignin-containing nanocellulose, and 30% for lignin-free samples. The mechanical properties increased considerably, however, for loads higher than 5% a negative trend was observed presumptively due to a clustering of nanocellulose components in PVA matrix. The barrier properties of the films were improved with the use of nanocellulose, especially at small amounts (1–3%). The antioxidant capacity of films was increased up to 10% using lignin-containing nanocellulose compared to 4.7% using PVA. © 2019 Elsevier B.V.
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