Development and testing of material extrusion additive manufactured polymer–textile composites

Giselle Hsiang Loh,Adeayo Sotayo,Eujin Pei 한국의류학회 2021 Fashion and Textiles Vol.8 No.1

The adoption of Additive Manufacturing (AM) has gradually transformed the fashion industry through innovation and technology over the last decade. Novel AM systems and techniques are continuously being developed, leading to the application of AM polymers with textiles and fabrics in the fashion industry. This work investigates the development and testing of polymer–textile composites using polylactic acid (PLA) filaments on synthetic mesh fabrics using direct material extrusion (ME). An aspect of this paper highlights the appropriate combination of printing material, textile substrate, and printer settings to achieve excellent polymer–textile adhesion. Details of the printing process to create polymer–textile composites are described, as are the interfacial strength results of the T-peel tests, and the observed failure modes post-testing. The peel strengths for different ME bonded polymer–textile composites are examined and used to identify the compatibility of materials. This work visualised the potential of direct ME of polymers onto textile fabrics as a material-joining approach for new textile functionalisation, multi-material composite explorations and innovative aesthetic print techniques. This work also adds to the limited knowledge of AM polymer–textile composites, which can provide helpful information for designers and researchers to develop new applications and facilitate future research development in smart embedded and programmable textiles.

ACOUSTICAL PROPERTIES OF VEGETAL FIBERS USED ON MULTILAYERED MATERIALS

Giselle M. Silva,M. D. C. Magalhaes 한국소음진동공학회 2008 한국소음진동공학회 국제학술대회논문집 Vol.2008 No.7

Vitis vinifera L. Grape Skin Extract Prevents Development of Hypertension and Altered Lipid Profile in Spontaneously Hypertensive Rats: Role of Oxidative Stress.

Giselle Franca da Costa,Dayane Teixeira Ognibene,Cristiane Aguiar da Costa,Michelle Teixeira Teixeira,Viviane da Silva Cristino Cord,Graziele Freitas de Bem,Anibal Sanchez Moura,Angela de Castro Resen 한국식품영양과학회 2020 Preventive Nutrition and Food Science Vol.25 No.1

This study investigated the protective effect of a Vitis vinifera L. grape skin extract (ACH09) on blood pressure, lipid profile, and oxidative status in spontaneously hypertensive rats (SHR). Systolic blood pressure (SBP), total cholesterol, triglyceride, and glucose levels, as well as oxidative damage and antioxidant activity in the plasma and kidney, were evaluated in four experimental groups: control Wistar rats (W-C) and SHR-C that received water, and Wistar rats and SHR treated with ACH09 (200 mg/kg/d) in drinking water for 12 weeks (W-ACH09 and SHR-ACH09, respectively). SBP increased in the SHR group compared with the W groups and the treatment with ACH09 prevented the development of hypertension. Plasma triglyceride and total cholesterol levels increased in SHR compared with W-C rats; these changes prevented by treatment with ACH09. Glucose levels did not differ between the groups. The SHR group had increased oxidative damage in plasma, as expressed by 2-thiobarbituric acid reactive substances (TBARS) levels, and this prevented by ACH09. Levels of TBARS in the kidneys were lower in the SHR-ACH09 group than in the SHR-C group. Further, ACH09 increased the superoxide dismutase activity in both the plasma and kidneys of both SHR and Wistar rats. These results suggest that ACH09 is protective against disruption of blood pressures, oxidant status, and lipid profile in SHR, and provide important evidence on the benefits of ACH09 on hypertension and associated cardiovascular complications.

THE IMPACT OF LUXURY BRAND ATTRIBUTES ON CARIBBEAN AND AFRICAN-AMERICAN CONSUMERS

Giselle C. Greenidge,Jessica Strubel 글로벌지식마케팅경영학회 2015 Global Fashion Management Conference Vol.2015 No.06

In 2010, there were approximately 38.9 million Black Americans residing in the U.S. (Waters, Kasinitz, & Asad, 2014). Caribbean and African-Americans do engage in luxury shopping (Forbes, 2013). A three part theoretical framework has been developed to present this research, including spatial diffusion theory, conspicuous consumption theory, and the Value Chain model. Although there is a vast amount of information on luxury attributes, there is a gap in research surrounding this topic in relation to ethnic groups such as Caribbean and African-American consumers. Hence, the purpose of the study is to examine the impact of luxury brand attributes on Caribbean and African-American consumers. The specific objectives of this study were to identify the main attributes of luxury goods and services; to examine these main attributes and compare Caribbean and African-American consumers; and to study the impact of those attributes on purchase intentions and word-of-mouth on purchase decisions. The study surveyed 440 consumers and interviewed 8 individuals. Participants were West Indians residing in the U.S. and in the Caribbean, and African-Americans residing in the U.S. between the ages of 18 and 64. The data was then analyzed using SPSS. A total of eight (8) interviews were conducted (7 females and 1 male). The consumers ranged from ages 20 to 33. Questions covered the following topics: demographics, lifestyle, sources of appearance, shopping patterns and preferences, and dress and appearance preferences. Texts within the interviews were coded and Cohen’s kappa was also conducted to establish reliability. The main criterion when shopping was style. There were significant differences between Ethnicity and the following: having favorite brands while shopping (Χ2 = 37.741, p = .000); whether or not the respondents’ favorite brands were high fashion (Χ2 = 19.123, p = .000); whether or not respondents liked wearing expensive clothing and/or accessories (Χ2 = 21.200, p = .000); feeling the need to invest in luxury apparel (Χ2 = 20.836, p = .000); respondents thinking that wearing luxury products convey success or accomplishment (Χ2 = 40.936, p = .000); and imitating the way celebrities dress (Χ2 = 37.006, p = .000). The survey revealed that respondents consulted family members, friends, and co-workers for fashion advice. The findings of this study support previous literature in relation to the main attributes of luxury goods. Conspicuous consumption theory explains the behavior of these consumers who may be trying to display their wealth by purchasing expensive items. Word-of-mouth played a significant role in the purchase decisions of both consumer groups. For Caribbean consumers, the main criteria were style and quality, whereas for African-Americans, the main criteria were style and price. Limitations and implications of the study are discussed.

Study of Some Parameters which Affect Xylanase Production: Strain Selection, Enzyme Extraction Optimization, and Influence of Drying Conditions

Giselle Maria Maciel,Luciana Porto de Souza Vandenberghe,Ricardo Cancio Fendrich,Bianca Eli Della Bianca,Charles Windson Isidoro Haminiuk,Carlos Ricardo Soccol 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.6

Xylanases are glycosidases mainly responsible for the hydrolysis of β-1,4 linkages in xylan. Xylanase was produced in this work by solid-state fermentation using agro industrial residues with Aspergillus niger strain, which was screened through qualitative and quantitative methods. Extraction processes with different solvents were evaluated. Solvent volume, time, and agitation speed (shaker) were optimized using statistical designs. Drying studies of the solid fermented material were also conducted in a laboratory oven where the following conditions were applied: 42oC and 50oC for 20 h and 80oC for 1 h; 50oC and 75oC for 6 and 3 h, respectively. Best extraction conditions were 37 mL of solvent composed by NaCl solution (0.9%) with Tween 80 (0.1%) in 3 g of cultured material with agitation at 133 rpm in shaker for 4 min. Highest xylanase activity was 2,327 IU/gdm. The drying at 42oC for 20 h provided a better maintenance of xylanase activity (58% of xylanase activity). Xylanases are glycosidases mainly responsible for the hydrolysis of β-1,4 linkages in xylan. Xylanase was produced in this work by solid-state fermentation using agro industrial residues with Aspergillus niger strain, which was screened through qualitative and quantitative methods. Extraction processes with different solvents were evaluated. Solvent volume, time, and agitation speed (shaker) were optimized using statistical designs. Drying studies of the solid fermented material were also conducted in a laboratory oven where the following conditions were applied: 42oC and 50oC for 20 h and 80oC for 1 h; 50oC and 75oC for 6 and 3 h, respectively. Best extraction conditions were 37 mL of solvent composed by NaCl solution (0.9%) with Tween 80 (0.1%) in 3 g of cultured material with agitation at 133 rpm in shaker for 4 min. Highest xylanase activity was 2,327 IU/gdm. The drying at 42oC for 20 h provided a better maintenance of xylanase activity (58% of xylanase activity).

Effects of <i>Angelica gigas</i> Nakai on the production of decursin‐ and decursinol angelate‐enriched eggs

Fontamillas, Giselle Ann D,Kim, Si Won,Kim, Hoy‐,Ung,Kim, Sung‐,Jo,Kim, Jong Geun,Park, Tae Sub,Park, Byung‐,Chul John Wiley & Sons 2019 Journal of the Science of Food and Agriculture Vol.99 No.6

<P><B>Abstract</B></P><P><B>BACKGROUND</B></P><P>The livestock industry requires high‐quality products, as well as improved productivity. There have been many studies regarding the utilization of feed additives aiming to increase productivity, enhance immune functions and prevent infectious diseases in livestock. Biofunctional feed additives would be beneficial not only for animal health, but also for consumers. In the present study, we utilized root and byproduct (stem and leaf) powders of <I>Angelica gigas</I> Nakai (AGN, Korean Danggui) as feed additives and examined the deposition of biofunctional compounds, such as decursin and decursinol angelate, into egg white and yolk.</P><P><B>RESULTS</B></P><P>We optimized the detection system for decursin and decursinol angelate, and determined the amounts of decursin and decursinol angelate derived from AGN byproducts (stem and leaf) as well as root. In Experiment 1, laying hens were fed with the dried AGN root powder and the effective compounds were detected in egg white and yolk. Subsequently, in Experiment 2, we examined AGN byproducts as an alternative feeding supplement. Additionally, biochemical parameters were analyzed to evaluate changes in the health of the hens by feeding AGN root powder. The results obtained indicated that decursin and decursinol angelate were stably transferred into egg white and yolk by feeding AGN byproducts as well as root. Intriguingly, plasma cholesterol levels were significantly decreased in a dose‐dependent manner, and those of interleukin‐1β, as an immune‐related biomarker, were considerably increased in the treated hens.</P><P><B>CONCLUSION</B></P><P>These results indicated that AGN root and byproducts (stem and leaf) could be utilized for the production of value‐added eggs and improving the health of hens in the poultry industry. © 2018 Society of Chemical Industry</P>

Effects of lemon or cinnamon essential oil vapor on physicochemical properties of strawberries during storage

Elise Freche,John Gieng,Giselle Pignotti,Salam A. Ibrahim,Helen P. Tran,Dong U Ahn,Xi Feng 한국식품저장유통학회 2023 한국식품저장유통학회지 Vol.30 No.4

Recently, consumers have gained an interest in natural and minimally processed foods, inciting the food industry to consider using of natural products as preservatives. Strawberries are a widely consumed fruit but are also highly perishable. Therefore, in this study, the physicochemical properties of strawberries (Fragaria×ananassa) were evaluated after a 12-h treatment with lemon essential oil (Citrus×limon) or cinnamon essential oil (Cinnamomum cassia) vapor during storage at 22℃ for 4 days in an accelerated shelf-life study and 4℃ for 18 days in a validation study. Weight loss was blunted in fruit treated with oil vapor during the first days of storage (p<0.05). Lemon essential oil delayed fruit darkening (p<0.05) but reduced the firmness of strawberries (p<0.05). Strawberries treated with cinnamon essential oil had a higher concentration of reducing sugars (p<0.05), and a decrease of 16.7% visible decay, although the difference was insignificant. Oil vapor treatment did not alter the pH, organic acid content, or soluble solid content during storage compared to the control. Since lemon and cinnamon essential oils have well-documented antimicrobial properties, they may be suitable for the natural preservation of fruit. This study provides new information on using essential oil vapor treatment to preserve fruits, and potentially decrease fruit loss and waste.

Involvement of a LiCl-Induced Phosphoprotein in Pigmentation of the Embryonic Zebrafish (Dania rerio)

Eun-Jung Jin(진은정),Giselle Thibaudeau 한국생명과학회 2008 생명과학회지 Vol.18 No.9

Neural crest는 신경계의 발생과정에서 생긴 특정화된 외배엽으로서 말초신경계(peripheral nervous system)의 모든 sensory cells과 fibers, 자율신경계의 대부분의 peripheral cells, unipolar spinal ganglion cell, cranial sensory ganglia, peripheral nerve의 neurolemmal sheath cells, ganglia의 capsule cells, sympathetic ganglia, chro-maffin cells, pigment cell 등이 분화한다. Fish의 경우는 melanin을 가지고 있는 melanophores, yellow pigment를 가지고 있는 xanthopores, reflecting platelets를 가지고 있는 iridophores등 3가지의 pigment-producing cell을 가지고 있다. 다양한 pigement들의 deposition, distribution에 의해 Fish와 amphibian에서 볼 수 있는 수많은 color와 pattern이 만들어지게 된다. Embryonic neural crest가 patterning을 연구하기에 아주 좋은 모델임에도 불구하고, choromatophores의 cell-signaling mechanism에 관한 연구는 거의 없는 실정이다. 본 연구에서는 melano-somes의 melanocyt로의 이동기작과 이 들의 dentiritic processe를 밝히기 밝히기 위해 phosphorylaion assay와 투과형 전자 현미경(transmission electron microscope)등을 이용한 다양한 실험들을 토대로, Lithium에 의해 유도되는 morphological alteration에 IP cell signaling pathway에 의해 조절되는 단백질의 하나인 55-kDa단백질의 인산화가 중요한 역할을 함을 밝혔다. The embryonic zebrafish (Danio rerio) is rapidly becoming an important model organism for studies of early events in vertebrate development. Neural crest-derived pigment cell precursors of the embryonic zebrafish give rise to melanophores, xanthophores, and/or iridophores. Cell-signaling mechanisms related to the development of pigmentation and pigment pattern formation remain obscure. In this study, zebrafish embryos were treated with various signaling-related molecules - LiCl (an inositol-phosphatase inhibitor), forskolin (a protein kinase-A activator), a combination of LiCl/forskolin, and LiCl/heparin (an IP₃ inhibitor) in order to identify the mechanisms involved in pigmentation. LiCl treatment resulted in ultrastructural and morphological alterations of melanophores. To identify the possible proteins responsible for this ultrastructural and morphological change, phosphorylation patterns in vitro and in vivo were analyzed. LiCl and LiCl/forskolin treatment elicited dramatic increases in the phosphorylation of a 55-kDa protein which was inhibited by heparin treatment. LiCl treatment also induced phosphorylation of a 55-kDa protein in melanophores purified from adult zebrafish. Collectively these results suggest that a LiCl-induced 55-kDa phosphoprotein plays a role in melanophore morphology and ultrastructure and ultimately effects gross pigmentation.

Controlled Electrochemical Intercalation of Graphene/<i>h-</i>BN van der Waals Heterostructures

Zhao, S. Y. Frank,Elbaz, Giselle A.,Bediako, D. Kwabena,Yu, Cyndia,Efetov, Dmitri K.,Guo, Yinsheng,Ravichandran, Jayakanth,Min, Kyung-Ah,Hong, Suklyun,Taniguchi, Takashi,Watanabe, Kenji,Brus, Louis E. American Chemical Society 2018 Nano letters Vol.18 No.1

<P>Electrochemical intercalation is a powerful method for tuning the electronic properties of layered solids. In this work, we report an electrochemical strategy to controllably intercalate lithium ions into a series of van der Waals (vdW) heterostructures built by sandwiching graphene between hexagonal boron nitride (<I>h</I>-BN). We demonstrate that encapsulating graphene with <I>h</I>-BN eliminates parasitic surface side reactions while simultaneously creating a new heterointerface that permits intercalation between the atomically thin layers. To monitor the electrochemical process, we employ the Hall effect to precisely monitor the intercalation reaction. We also simultaneously probe the spectroscopic and electrical transport properties of the resulting intercalation compounds at different stages of intercalation. We achieve the highest carrier density >5 × 10<SUP>13</SUP> cm<SUP>2</SUP> with mobility >10<SUP>3</SUP> cm<SUP>2</SUP>/(V s) in the most heavily intercalated samples, where Shubnikov-de Haas quantum oscillations are observed at low temperatures. These results set the stage for further studies that employ intercalation in modifying properties of vdW heterostructures.</P> [FIG OMISSION]</BR>

Antioxidant therapy enhances pulpal healing in bleached teeth

Lima, Adriano Fonseca,Marques, Marcelo Rocha,Soares, Diana Gabriela,Hebling, Josimeri,Marchi, Giselle Maria,de Souza Costa, Carlos Alberto The Korean Academy of Conservative Dentistry 2016 Restorative Dentistry & Endodontics Vol.41 No.1

Objectives: The purpose of this study was to evaluate the histopathological effects of an antioxidant therapy on the pulp tissue of rat teeth exposed to a bleaching gel with 35% hydrogen peroxide. Materials and Methods: Forty rats were subjected to oral ingestion by gavage of distilled water (DW) or ascorbic acid (AA) 90 min before the bleaching therapy. For the bleaching treatment, the agent was applied twice for 5 min each to buccal surfaces of the first right mandibular molars. Then, the animals were sacrificed at 6 hr, 24 hr, 3 day, or 7 day post-bleaching, and the teeth were processed for microscopic evaluation of the pulp tissue. Results: At 6 hr, the pulp tissue showed moderate inflammatory reactions in all teeth of both groups. In the DW and AA groups, 100% and 80% of teeth exhibited pulp tissue with significant necrosis and intense tissue disorganization, respectively. At 24 hr, the AA-treated group demonstrated a greater regenerative capability than the DW group, with less intense inflammatory reaction and new odontoblast layer formation in 60% of the teeth. For up to the 7 day period, the areas of pulpal necrosis were replaced by viable connective tissue, and the dentin was underlined by differentiated odontoblast-like cells in most teeth of both groups. Conclusions: A slight reduction in initial pulpal damage during post-bleaching was promoted by AA therapy. However, the pulp tissue of AA-treated animals featured faster regenerative potential over time.