646 results on '"EXTRACTION"'
Search Results
2. Transformative learning at the community-university-land interface: A political ecology of knowledge, education and health
- Author
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Andrea Cortinois, Ben Brisbois, Blake Poland, Dahlia Benedikt, Kayvan Wind, Lisa Mychajluk, Marlena Dang-Nguyen, Raglan Maddox, and Sandrine M. Mudakenga
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land-based learning ,critical pedagogy ,transformative learning ,planetary health ,ecohealth ,extraction ,Environmental sciences ,GE1-350 ,Political science - Abstract
As awareness grows of the catastrophic implications of global environmental change, multiple scholarly fields addressing health-environment relationships have advocated 'transformative' educational strategies. Holistic Indigenous health-environment models inspire and inform many such efforts, but related land-based learning initiatives involving universities are often impeded by the competitive processes of academia. In this article we report on a community-university partnership – Pedagogy for the Anthropocene (P4A) – aimed at developing transformative educational responses to pressing global crises, inspired by land-based approaches. We integrate political ecologies of health, education, and knowledge to understand the troubled production of pedagogical knowledge in P4A, participant experiences in the resulting educational programs and the role of health and bodies in both. We first trace the production of knowledge as shaped by macroscopic and localized institutional forces; organizational and occupational dynamics; interacting knowledges and individuals; and material factors. Next, we explore participant experiences in the resulting educational programming. In both steps, affect-laden bodies of academics, trainees and community members reveal entanglements with human communities and more-than-human elements, shaped in variable ways by institutional forces such as settler colonialism and university neoliberalization. One key finding involves the role of universities in relation to land dispossession at home and abroad; another includes the challenges of pursuing transformational community-university research within contemporary universities. Tracing such entanglements yields implications for future land-based learning efforts in university settings, and broader praxis for environmental justice in the shadow of higher education's complicity with settler colonialism and globally extractive neoliberal capitalism.
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- 2024
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3. MIH et premières molaires permanentes compromises. Quand et quelles dents extraire: lignes guides.
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LEGRIS, Sylvie
- Abstract
Copyright of Orthodontie Française is the property of John Libbey Eurotext Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
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4. EXTRACTION OPTIMIZATION OF TRADESCANTIA SPATHACEA SW. LEAF CRUDE EXTRACT AND ANTHOCYANIN CONTENT
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ANILÚ MIRANDA-MEDINA, PAOLA LIBERTAD GARCÍA-MEDEL, KAREN RODRÍGUEZ-MARTÍNEZ, PATRICIA MARGARET HAYWARD-JONES, DULCE MARÍA BARRADAS-DERMITZ, and GEORGINA LUNA-CARRILLO
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extraction ,health and energy applications ,natural red pigments ,Chemical technology ,TP1-1185 - Abstract
Considering both the health and energy areas where anthocyanins have been revealing their real and potential applications, research on their extraction optimization methods is a priority. Conditions to achieve the highest mass of crude extract from Tradescantia spathacea leaves with the highest absorbance (A) in the region of 500 - 540 nm linked with anthocyanins, were investigated through a Box-Behnken design and response surface methodology. Independent variables involved in the Box-Behnken design were solvent (ethanol) concentration (30, 50, 70 % v/v), solvent/fresh leaf ratio (1.67:1, 2.34:1; 3:1 v/w) and extraction temperature (30, 50, 70 °C). Dependent (response) variables were crude extract amount and the extract with the maximum A in the region of 500-540 nm. Experimental values of A 500 - 540 nm were 0.3562 and 0.7558; crude extract mass ranged between 0.285 g and 0.7157 g, corresponding to a yield between 144 to 347 mg dried extract per g of dried leaf. Using a solvent/fresh leaf ratio of 3:1 v/w, 70 °C, 65 % ethanol, the highest values of both crude extract mass and A 500 - 540 nm were obtained.
- Published
- 2023
5. Experimentation and Extraction in Reintegration Governance: the case of Kosovo
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Ruth Vollmer and Zeynep Sahin-Mencutek
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reintegration ,return ,local migration governance ,Kosovo ,extraction ,Social Sciences ,Sociology (General) ,HM401-1281 - Abstract
This article focuses on the governance of reintegration in Kosovo, where return and reintegration has been an issue since 1999. Drawing on qualitative empirical and desk research, we argue that Kosovo's reintegration governance landscape is a site of experimentation and extraction in relation to the policy objectives of destination countries prioritizing returns. Extraction occurs as the management of returnee reintegration becomes an opportunity for revenue generation for multiple state and non-state as well as transnational and local actors. Experimentation concerns innovations and testing mainly initiated by donors and international actors, then appropriated by local partners. The paper contributes to the understanding of specific mechanisms of reintegration governance, modes of practice and power relations between multiple actors operating at different scales.
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- 2023
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6. Comparative Study of Genomic DNA Extraction Methods for Common bean (Phaseolus vulgaris L.)
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Tigist Firew Mekaunint, Hewan Demissie Degu, and Yayis Rezene
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CTAB ,Common bean ,gDNA ,Extraction ,PCR ,Agriculture - Abstract
Common bean (Phaseolus vulgaris L.) is one of the significant grains used in the human diet, accounting for half of all grain legumes consumed globally. To enhance production, conventional breeding and molecular approaches have been used so far. An efficient and rapid genomic DNA extraction method is required for these molecular approaches. The aim of this study was to compare and optimize an efficient and rapid DNA extraction protocol for common bean. Modified cetyl trimethylammonium bromide (CTAB) and potassium chloride (KCL) extraction methods were used. The mean DNA yield per nanoliter was 209 µg from modified CTAB and 150.3 µg from the KCL method. The concentration of gDNA was significantly (P< 0.05) higher for the KCL method, which was 5.01 µg/µl and 2.09 µg/µl for the CTAB method. The obtained DNA was also pure, with an absorbance ratio at 260 nm to an absorbance of 280 nm (A260/280) of 1.75-2.23 for the KCL method and 1.86-2.09 for the modified CTAB method. Gel electrophoresis separation was used to evaluate the quality of the total DNA extracted by the present protocols. The results showed that intense bands close to the gel wells were obtained from both extraction methods. DNA isolated with the two methods was successfully used for PCR-based downstream analysis, which includes random amplified polymorphic DNA (RAPD) and simple sequence repeat (SSR) markers. In this study, it took approximately 150 minutes for KCL and 240 minutes for the CTAB for whole process. In contrast to the CTAB method, the KCL method uses inexpensive and less hazardous reagents and requires only ordinary laboratory equipment. Therefore, it is more convenient and economical than the traditional technique.
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- 2023
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7. On the Possibility of Waste-Free Use of Mineral Resources of the Angrensky Brain Coal Deposit
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Bekpulatov Javlon Mustafokulievich, Makhmarezhabov Dilmurod Bakhtiyarovich, and Umirzokov Azamat Abdurashidovich
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lignite ,kaolin ,enrichment ,alumina ,component ,extraction ,concentrate ,motley and quartz ,Environmental sciences ,GE1-350 - Abstract
The Angren lignite basin is a complex coal-kaolin deposit. Here, in addition to brown coal, there are large reserves of kaolin clays of two types - primary and secondary, occurring respectively in the soil and the roof of the coal strata. Secondary clays, in turn, subdivided into gray and variegated, which during overburden and mining of coal seams in the bulk go to the dump. Gray kaolins currently partially processed at the “Angren Kaolin” LLC factory in order to obtain enriched kaolin used for the production of building ceramics, etc.
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- 2024
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8. Examining the methods used to extract various grades of Argan oil sold on the Moroccan market: Implications for quality and safety
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El Kabous Karima and Ouhssine Mohammed
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argan oil ,cake ,extraction ,storage ,roasting ,quality ,Environmental sciences ,GE1-350 - Abstract
The present study focused on the comparison of Argan oil extraction processes and their influence on oil and cake quality and safety. A survey was conducted among Argan oil producers in the Essaouira region of Morocco. The responses revealed that the quality of Argan products is influenced by several factors, the main one being the quality of the fruit. For 25% of responses, representing the women selling Argan oil in the souks, Argan fruits “AQAY” are soaking in water to facilitate the crushing stage. However, this maceration can lead to fermentation and mold. Besides, the quality of the mixing water is different from one response to another. Just 50% of responses came from cooperatives use high microbiological quality water. Eventually, poor-quality water affects the composition and shelf life of Argan products besides consumer health and safety. Furthermore, there is also significant variation in roasting time and temperature, roaster type, and storage conditions. Indeed, these factors have the greatest influence on the quality of Argan products. Consequently, the present investigation has shown that the extraction process from raw material to final product varies considerably between the obtained results. Therefore, extraction processes and storage conditions need to be standardized. This will improve the quality of Argan oil and cake.
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- 2024
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9. DYNAMICS DESCRIPTION AND THERMODYNAMICS ANALYSIS OF POLYSACCHARIDES EXTRACTION PROCESS FROM FOXTAIL MILLET
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AI S. ZHU, YI N. WANG, JING K. CHEN, JUN Z. ZHAO, and YONG PENG
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foxtail millet ,polysaccharides ,extraction ,model ,dynamics ,thermodynamics ,Chemical technology ,TP1-1185 - Abstract
Polysaccharides was extracted from foxtail millet using hot water at the appropriate agitation rate and liquid to material ratio. The changing situations of polysaccharides mass concentration in the extraction solution with the extraction temperature and extraction time were measured. The experimental data obtained were fitted with the second-order dynamic model; the dynamic and thermodynamic parameters were calculated and analyzed. The results showed that the higher the extraction temperature, the shorter the time needed to reach the extraction equilibrium and the higher the polysaccharides equilibrium mass concentration. The extraction process of polysaccharides could be described with the second-order dynamic model. The apparent activation energy value was 44.34 kJ·mol-1. When the extraction temperature increased from 323 to 363 K, the half-life period value was shortened from 33.4 to 6.2 min, and the internal diffusion coefficient increased from 2.43×10-9 to 1.36×10-8 m2·min-1. The enthalpy value and entropy value of the extraction process was 25.92 and 100.06 J·mol-1·K-1 respectively, and the Gibbs free energy value were all less than zero, indicating that the extraction process was an endothermic, entropy increasing, spontaneous and irreversible process. Increasing the temperature was conducive to the process.
- Published
- 2022
10. Extraction d'une canine : une complication extrême d'une contention mandibulaire linguale fixe.
- Author
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SINGH, Parmjit
- Abstract
Copyright of Orthodontie Française is the property of John Libbey Eurotext Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2022
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11. FATTY ACIDS CONTENT AND ANTIBACTERIAL ACTIVITY OF Sargassum duplicatum LIPID
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RIONG S. PANJAITAN, ARI T. W. ASTUTI, HILWA R. NOVITA, and FUAD ALHADI
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disc diffusion ,extraction ,folch method ,oleic acid ,palmitic acid ,Chemical technology ,TP1-1185 - Abstract
Propionibacterium acne, Bacillus cereus and Escherichia coli are bacteria that cause infections of the skin and digestive tract in humans. Sargassum duplicatum, one of brown macroalgae species, is known to have the antibacterial activities. This study aims to prove antibacterial activities of S. duplicatum lipid against three different bacteria. The method used is the Folch method (using soxhletation, with a ratio of chloroform: methanol 2:1, v/v) to extract lipid. Furthermore, fatty acids content was identified by gas chromatography - mass spectrophotometry (GC-MS). Then, the disc diffusion method was used to measure the inhibition zone for antibacterial activity by using tetracycline as positive control. The lipid percentage of S. duplicatum was obtained about 2.502 % (v/w) where there were two lipid layers namely chloroform layer (0.388 % (v/w)) and methanol layer (2.114 % (v/w)). S. duplicatum lipid contained palmitic acid (in both layers) and oleic acid (only methanol layer). Moreover, methanol and chloroform lipid layer (1000 mg·mL-1) of S. duplicatum showed antibacterial activity against B. cereus, E. coli and P. acne
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- 2022
12. Wastewater Purification by Nanofiltration Technology
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Boutheyna AOUFI and Mohamed Amine DIDI
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Nanofiltration ,Extraction ,Iron ,Copper ,membrane SNTE NF270-2540 ,Science - Abstract
The removal of two different heavy metals in aqueous solutions was investigated with polyamide nanofiltration membrane SNTENF270-2540, the results show that the retention of iron ions was total (100%). Depending of the experimental conditions, the retentionof copper ions was varied from 82% to 94%. It was observed that the pH has no influence in the iron retention. The retention of ions bynanofiltration was done by Donnan effect (electrostatic repulsion) and counter-ion volume effect (steric exclusion).
- Published
- 2022
13. Complications des chirurgies dentaires.
- Author
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Robert, Mickaël
- Abstract
Copyright of Nouveau Praticien Vétérinaire - Équine is the property of EDP Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2022
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14. Inulin obtained from Jerusalem artichoke using microwave-assisted extraction and its metabolic influence
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Manuel DRUGULESCU, Cristina Elena DINU-PIRVU, and Narcisa BABEANU
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inulin ,microwave ,extraction ,modelling ,metabolism ,Medicine ,Medicine (General) ,R5-920 - Abstract
Introduction. Inulin has high potential as a supplement for food, pharmaceutical and medical use and raised an increased interest in obtaining high-quality products. The objective of the study was to evaluate the physiological impact of the administration of inulin obtained by microwave hydrodiffusion and gravity (MHG). Materials and methods. Helianthus tuberosus was used as a raw material from commercial sources. The inulin was extracted using MHG, followed by separation. The extraction method has been optimized by surface response methodology (SRM). The obtained inulin was administered to laboratory animals. The influence of the administration of standard inulin (INS), inulin obtained by MHG (INE) and inulin obtained by MHG in combination with quercetin (INE+Q) was evaluated, for 12 days, on the variation of weight and blood parameters such as blood sugar, cholesterol and triglycerides. Results. Inulin was obtained at optimal values (74.74 °C and 15.55 min); the yield was 72.98%. The statistical analysis revealed that on the first day of treatment there are statistically significant differences only between the groups treated with INS and INE. On the third day of treatment, significant differences occur only when comparing the weights recorded in the batches treated with INS and INE+Q. In the following days of treatment (5th, 7th, and 9th) there were statistically significant differences only between the groups treated with INS and INE. Even though there are significant differences between the two groups, all data fall within the normal range. On the 12th day of treatment, the results obtained were considered statistically insignificant. Conclusions. The use of inulin obtained by innovative MHG proved to have positive effects on laboratory animals.
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- 2021
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15. Struggles at the ‘Peripheries’: Situated knowledge production and feminist visions for post-extractive environments
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Karin Reisinger
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situated knowledges ,feminisms in architectures ,extraction ,method ,post-extractive imaginaries ,Aesthetics of cities. City planning and beautifying ,NA9000-9428 ,Urban groups. The city. Urban sociology ,HT101-395 ,Urbanization. City and country ,HT361-384 - Abstract
In extractive territories, companies determine local areas, from the scale of shared environments and urban transformations to cultural events. With my observations from two mining communities, I foreground feminist actors who apply spatial practices of care, support, maintenance, and reproduction. They are highly relevant for the endurance of the communities. Two goals frame these observations: (1) drawing attention to feminist actors’ reparative and counter-extractive practices as forms of shared architectural interventions within already documented architectures of mining; and (2) providing situated knowledges together with a material positionality of extraction as a requirement for architectural production based on iron ore.The first town of my fieldwork is Malmberget (literally ‘ore mountain’) in Sápmi / the north of Sweden, which will ultimately disappear as a result of the expansion of mining. The second town is Eisenerz at the foot of the mountain Erzberg (also meaning ‘ore mountain’), in the Austrian Alps, which is likewise in a crisis of identification, over-ageing, and shrinking, because mining requires a diminishing human workforce. Since both communities are in search of new narratives for post-extractive futures, I want to show how architectural research can ‘observe’ differently, foregrounding alternative actors, their feminist ecologies, and their productive spaces. Learning from actors who embroider architectures soon to be lost, curate farewell events for architectures, or preserve the colours of facades in paintings, and also learning from my experience of participating in their processes, I argue that extractive areas are diverse and full of life, pleasure, and creativity. For future scenarios, I suggest activating these situated knowledges to contribute to feminist visions for post-extractive environments.
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- 2022
16. Microbes for Archaeological Wood Conservation
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Sathiyanarayanan Ganesan, Mathilde Monachon, Sarah M. James, and Edith Joseph
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Extraction ,Iron ,Sulfur ,Watherlogged archaeological wood ,Chemistry ,QD1-999 - Abstract
This project focuses on innovative biological methods of extraction for the preservation of waterlogged wood suffering from salt precipitation and acidification. The principal investigator and her team proposed to exploit biomineralization capacities of some bacteria for anticipating the extraction of iron and sulfur compounds when wood is still wet. A comprehensive assessment of the extraction performances achieved on wood objects from lake and marine environments will allow a versatile extraction method to be proposed to end-users.
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- 2022
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17. Traitement de la classe II avec extraction par aligneurs: une approche fiable.
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GRECO, Mario and ROMBOLÀ, Andrea
- Abstract
Copyright of Orthodontie Française is the property of John Libbey Eurotext Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2022
- Full Text
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18. (Un)Worlding the Plantationocene: Extraction, Extinction, Emergence
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Sophie Chao
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Southeast Asia ,plantation ,extinction ,extraction ,emergence ,Plantationocene ,Social Sciences - Abstract
This article explores how tropical plantation lifeworlds are made and unmade through more-than-human forms of extraction, extinction, and emergence. Taking the palm oil sector as my primary focus of inquiry, I trace the extractions of substance, land, and labour undergirding the historical transformation of oil palm from West African subsistence plant to pan-tropical cash crop and controversial global commodity. I then examine how the presents, futures, and relations of multispecies communities are pushed to the edge of extinction under the plantation logic of ecological simplification, reorganization, and instrumentalization. Finally, I explore oil palm landscapes as zones of ecological emergence, where diverse plants, animals, and fungi are learning to co-exist with oil palm in new forms of symbiosis. Thinking-with processes of more-than-human extraction, extinction, and emergence foregrounds the sequential and synchronous ways in which plantations are worlded, unworlded, and reworlded across time, space, and species. Such an approach points to the importance of reconciling theoretical conceptualizations of plantations as ideology with ethnographically grounded examinations of plantations as patches. It also invites difficult but important ethical, political, and methodological questions on how to story the lively facets of plantation lifeworlds without doing (further) violence to the human and other-than-human beings who experience plantations as lethal undoings and endings.
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- 2022
19. Étude de l'activité anti-inflammatoire et antihémolytique des graines de Lepidium sativum L. (cresson alénois).
- Author
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Moumen, O., Habibi, Y., Zaagane, Z., and Ouldali, O.
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ARAB medicine , *MEDICINAL plants , *FOOD preservation , *PLANT extracts , *THERAPEUTICS - Abstract
As a result, current medicine is increasingly giving pride of place to medicinal plants. Crude plant and spice extracts are starting to gain much interest as a potential source of bioactive natural molecules as an alternative for the treatment of infectious diseases food preservation. This work is a contribution to evaluate the anti-hemolytic anti-inflammatory properties of the seeds of Lepidium sativum "Cresson", a medicinal plant of the Brassicaceae family, widely used in traditional medicine on the scale of the Arab world thanks to its richness in chemical compounds. The hydro-methanolic and aqueous extraction allowed us to recover two extracts with variable yields, the highest rate being recorded by maceration with 16.43%. The in-vitro anti-inflammatory activity of the two extracts demonstrated protein stabilization activity against thermal denaturation with an efficacy comparable to that of the anti-inflammatory agent diclofenac (IC50 = 0.84 mg/ml). IC50 = 1.26 mg/ml maceration and IC50 = 2.17 mg/ml for the aqueous extract. The results of the anti-hemolytic activity carried out in vitro indicate that the hydromethanolic extract of these seeds has a significant capacity vis-à-vis the inhibition of hemolysis of erythrocytes of 72.18% (1 000 μg/ml). [ABSTRACT FROM AUTHOR]
- Published
- 2022
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20. EVALUATION OF BILE ACIDS-BINDING CAPACITY AND TYROSINASE INHIBITOR POTENCY OF NOVEL PEPTIDES PREPARED FROM AGRICULTURAL WASTES VIA ENZYMATIC HYDROLYSIS
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Sanaa T. El-Sayed, Rehab A. Al- Azzouny, and Ola S. Ali
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bioactive peptides ,broad bean leaves ,cauliflower midribs ,corchorus stems ,extraction ,hydrolysate ,protein digestion ,ultrafiltration ,Chemical technology ,TP1-1185 - Abstract
The objective of this study was to prepare bile acidsbinding and tyrosinase inhibitory peptides for industrial potential application. Proteins were extracted from Brassica olercea (cauliflower) midribs, Corchorus olitorius (corchorus) stems and Vicia faba (broad bean) leaves then were subjected to hydrolysis by immobilized lettuce protease. For maximum peptides production, the influence of incubation temperatures, and substrate concentrations on the hydrolysis processes were investigated. Peptides were fractionated by ultrafiltration into three fractions according to their molecular weight. Corchorus (fractions F2 and F1) and broad bean (fraction F1) peptides showed bile acids-binding higher than that bind by cholestyramine resin. They may have potential application as a cholesterol-reducing agent for hypercholestermic patients. Cauliflower (F2 and F1) and corchorus (fraction F1) peptides showed tyrosinase inhibitor potency higher than that by kojic acid. They may have potential application as a whitening agent.
- Published
- 2020
21. THE ANTIOXIDANT COMPOUNDS DETERMINATION OF VARIOUS BREWER'S SPENT GRAIN EXTRACTS
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Marina V. Gernet, Maxim A. Zakharov, and Irina N. Gribkova
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amino acids ,bioactive compound ,brewer's spend grain ,extraction ,organic solutions ,plant raw material ,polyphenols ,Chemical technology ,TP1-1185 - Abstract
Brewer's spent grain is a brewing waste and contains a number of biologically active substances that not completely are extracted into malt wort during mashing, but are not use anywhere. The aim of the study was to obtain a comparative characterization of various surface active extractants, including cationic one, (benzyldimethyl-[3-(myristoylamino) propyl] ammonium chloride), in relation to phenolic compounds and amino acid content of brewer's spent grain, which can serve as the basis for the biologically active additives technology development. The extraction use made it possible to verify the soluble polyphenolic compounds (phenolic acids and rutin) and amino acids presence in the extracts. Studies have led to the conclusion that extractants can be presented in the following sequence in increasing extraction efficiency, i.e., in the strength of micelle formation, in increasing order: water, 0.01 % solution of benzyldimethyl-[3- (myristoylamino) propyl] ammonium chloride, 70 % solution of propane1,2-diol, 70 % solution of ethanol. All extracts are contained 18 amino acids, including 9 essential, 8 functional ones, and 5 polyphenolic substances, including rutin with P-vitamin activity. The carrying out alcohol extraction avoided the loss of essential amino acids by 4.5 % and functional ones - by 3.8 % respectively.
- Published
- 2020
22. The Gap Sampler: A Versatile Microfluidic Autosampler for Electrospray Ionization Mass Spectrometry
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Jerome Kaeslin
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autosampler ,extraction ,mass spectrometry ,microfluidics ,screening ,Chemistry ,QD1-999 - Abstract
Microfluidic autosamplers for electrospray ionization mass spectrometry (ESI-MS) are of major importance when using ESI-MS as a high-throughput and low sample consumption analytical method. In this article, microfluidic ESI-MS autosampler designs are overviewed and a group-owned prototype is discussed. The socalled gap sampler is a pin-based sampler for miniaturized flow injection (FI) analysis. To date, it has been used in various applications. Following proof of concept applications with FI of small molecules, pin modifications were implemented for unspecific and specific extraction for the analysis of complex samples. Most recently, further optimization allowed the study of non-covalent protein-ligand interactions for bioaffinity screenings, which constitutes a major milestone in the development of this novel high-throughput autosampler.
- Published
- 2020
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23. OPTIMIZATION OF La (III) EXTRACTION BY NANOFILTRATION
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BOUTHEYNA AOUFI, MOHAMED AMINE DIDI, and DIDIER VILLEMIN
- Subjects
extraction ,iron ,lanthanum ,nanofiltration ,optimization. ,Chemical technology ,TP1-1185 - Abstract
This study investigates the capacity of polyamide nanofiltration membrane (SNTE NF270-2540) to extract the lanthanum (La) (III) and its mixtures with the iron (Fe) (III). A three - level factorial design and response surface methodology was used to evaluate the effects of different parameters, such as: pH (3.0 – 9.0), concentration (10 – 100 ppm), pressure (6.0 – 13.5 bars). The results showed that the retention of La (III) varied from 29 % to 100 %, depending on the experimental condition it was possible to extract all of La (III) and Fe (III) from the same mixture. The results showed that the extraction of La (III) reaches 100 % for 10 and 55 ppm at pH = 3.0 and for 100 ppm at pH = 9.0, under the pressure of 13.5 bars. At pH = 3.0, the extraction of the mixtures La (III) / Fe (III) (50 ppm / 50 ppm) and (100 ppm / 100 ppm) whatever the pressure was all (100 %). The study confirmed a high lanthanum extraction using polyamide nanofiltration membrane.
- Published
- 2020
24. Essential Oil Extraction from Orange and Lemon Peel
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Karne Hemlata, Kelkar Vedvati, Mundhe Apoorva, Ikar Mitesh, Betawar Shantanu, and Chaudhari Nikita
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extraction ,aroma compounds ,lemon peel ,orange peel ,volatile compounds ,Environmental sciences ,GE1-350 - Abstract
The one-third of all food produced for human use is wasted each year which has made food waste a serious problem all around the world. Citrus juice manufacturing factories generate peel leftovers that can account for 50-60% of the weight of the fruit, contributing significantly to food waste. This study investigates the extraction of orange and lemon peel oils using the Soxhlet process and their analysis via gas chromatography. The aim is to identify and quantify key volatile compounds present in these oils, thereby putting the leftover peels to use. Fresh orange and lemon peels were transformed into zest and extracted using Hexane and Ethanol as solvent in a Soxhlet apparatus. Gas chromatography with a specialized column and detector unveiled major volatile compounds, including limonene, linalool, citral. These compounds contribute to the characteristic aroma and potential bioactivity of the oils. Orange peels displayed notably higher limonene content compared to lemon peels. This approach illuminated the chemical composition of the oils, offering opportunities in food, cosmetics, and fragrance industries. Orange peels contained 70-90% limonene, significantly more than lemon peels. The study concluded that peels harbor 28 volatile substances, with limonene responsible for their distinctive citrus scent. In sum, this research underscores the effectiveness of Soxhlet extraction, providing insights into orange and lemon peel oils’ composition using Gas chromatography and applications.
- Published
- 2023
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25. Advances in the Treatment of Diabetic Foot with MSC-derived Exosomes
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He Qiaoya
- Subjects
diabetic foot ,mesenchymal stem cells ,exosomes ,clinical application ,extraction ,Microbiology ,QR1-502 ,Physiology ,QP1-981 ,Zoology ,QL1-991 - Abstract
Diabetes is a chronic metabolic disease with a worldwide epidemic and its prevalence is increasing every year. Meanwhile, diabetes imposes serious economic burdens on the world. Commonly and seriously as a complication of type 2 diabetes, the diabetic foot is a multi-factorial chronic non-healing wound that not only poses serious threats to the patient's physical health but also comes along with huge financial and psychological burdens. In the long run, the risk of amputation is much higher inpatients who suffer from diabetic foot than in healthy people. [1] The prognosis for the diabetic foot is not encouraging in today's treatment paradigm, with the majority of patients having an unsatisfactory prognosis after conventional treatment, eventually leading to tissue necrosis, gangrene, and amputation. Numerous studies have suggested that mesenchymal stem cell exosomes (MSCs-Exos) have potential therapeutic value for patients with DFU and are increasingly being available in clinical practice. MSCs-Exos can accelerate DFU wound healing by promoting coagulation, inhibiting inflammatory responses, boosting cell proliferation and angiogenesis, and increasing collagen deposition. In addition, this article reviews the clinical application of MSC-derived exosomes in the treatment of diabetic foot and the advantages and limitations of MSC-derived exosomes as carriers, exploring the extraction process of exosomes. In the future, a unified and standardized guideline specification for purification and isolation techniques should also be established and enhanced, and a license for clinical application should be obtained. To verify the security and efficacy of exosomes in DFU treatment, large sample, and multi-centre clinical research should be designed.
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- 2023
- Full Text
- View/download PDF
26. Physico-chemical properties of calendula flower extract in bitter almond oil elemental composition and microbiological purity
- Author
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Khamidov O.J., Vapayev H.M., Nazarov S.I., Boltaeva Sh., and Ganiyev B.Sh.
- Subjects
calendula officinalis l ,gingvitis ,piorrhea ,paradontosis ,vitamins ,extraction ,cold pressing method ,chromatographic ,element analysis ,microbiological purity ,physical and chemical constants ,Environmental sciences ,GE1-350 - Abstract
The study used bitter almonds (Amygdalus communis L. Varietas amara D.C.) obtained by cold pressing medicinal nails grown in Navoi region using oil (Calendula officinalis L.) - with the participation of flowers, the extraction process was carried out by maceration (in a ratio of 1:10). The resulting oil extract was studied by its elemental composition, chromatographic analysis of its fatty acids, microbiological purity, chemical and physical constants.
- Published
- 2023
- Full Text
- View/download PDF
27. Antioxidant Activity Between Defatted and Different Solvent Temperature in Rice Bran var. IR-64 Extract
- Author
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Widyastuti Retno, Dwi Irwanto Rahmat, Purwati Nurlaili Enny, Hartati Sri, and Iqrar Irum
- Subjects
bioactive compounds ,extraction ,rice hull ,Environmental sciences ,GE1-350 - Abstract
The extraction of bioactive components in rice bran is influenced by various factors, including defatted treatment and temperature. The aim of this study was to know the yields, total phenol content, and antioxidant activity by defatted and solvent temperature treatment extraction in rice bran. The defatted treatment was not significant effect on the antioxidant activity of rice bran extract. Temperature treatment significantly increased antioxidant activity in rice bran extract. The yield obtained in the control (non-defatted) was 17.19 % with antioxidant activity of 66.30 % and phenol content of 148.6 mg GAE g−1 extract. While the yield on the defatted treatment showed a result of 0.49 % with antioxidant activity of 67.33 % and a phenol level of 53.34 mg GAE g−1 extract. The room temperature treatments on 50 °C and 70 °C obtained yields around 17.19 %; 9.81 % and 7.34 % with antioxidant activity 67.3 %; 82.09 % and 77.83 % and phenol content was 148.6 mg GAE g −1 extract, 91.7 mg GAE g −1 extract and 59.8 mg GAE g −1 extract. Defatted treatment was not significant effect on the antioxidant activity. Therefore, the optimum temperature of solvent that was effective to the antioxidant activity of rice bran IR-64 extract was at 50 °C.
- Published
- 2023
- Full Text
- View/download PDF
28. Extraction of astaxanthin from fermented Acetes using virgin coconut oil with the glass beads vortex method★
- Author
-
Fitriani Dwi, Rahmalia Winda, Ardiningsih Puji, Usman Thamrin, Nurbaeti Siti Nani, and Prayitno Dwi Imam
- Subjects
astaxanthin ,extraction ,fermented acetes ,glass beads vortex ,virgin coconut oil ,Oils, fats, and waxes ,TP670-699 - Abstract
Astaxanthin is an antioxidant that can be extracted from crustaceans such as shrimp, lobster, crawfish, and crabs. Fermented Acetes shrimp (called cincalok) is a traditional side dish from Indonesia rich in astaxanthin. This study extracted astaxanthin from cincalok using the glass beads vortex method with virgin coconut oil (VCO) as a green solvent. Several parameters that affect the amount of astaxanthin extracted, such as the ratio between sample and solvent, contact time, and particle size of glass beads, have been tested. The physicochemical characteristics of VCO before and after extraction were also analyzed. The UV-Vis spectrophotometer analysis results showed that the optimum ratio between sample and solvent was 1:10 g/mL, the optimum contact time was 15 minutes, and the optimum particle size of the glass beads was 60–80 mesh. Under these optimum conditions, the amount of astaxanthin extracted was 27.97 μg/g dry weight of cincalok or 2.79 μg/mL VCO. After extraction, the viscosity and density of VCO still meet the Indonesian National Standard with values of 17.98 mm2/s and 917.2 kg/m3, respectively. Before and after extraction, the GC-MS chromatogram shows the main component of fatty acids in VCO is lauric acid, with a percentage of 27.28 and 26.72%, respectively. VCO can also extract omega-3 fatty acids DHA and EPA from cincalok with the same rate of 0.04%.
- Published
- 2023
- Full Text
- View/download PDF
29. Crisis conservation and green extraction: biodiversity offsets as spaces of double exception
- Author
-
Philippe Le Billon
- Subjects
extraction ,conservation ,biodiversity offsets ,land grabs ,green grabs ,Environmental sciences ,GE1-350 ,Political science - Abstract
Extraction and conservation seem to be polar opposites, yet they entertain multiple relations as the 'greening' of extractive activities mobilizes conservation efforts to address the 'extinction crisis.' Drawing on a review of the literature and two case studies, this article discusses the politics of affinity and enmity shaping the extraction-conservation nexus, and partnerships. As crisis conservation and green extraction receive increased attention, the article suggests that the convergence of extraction and conservation is not only pragmatic, but also reflects shared discursive imaginaries and valuations of nature, practices materialized through spaces of 'double exception', and common politics of enmity directed at local communities that legitimize exclusionary practices rather than solve capitalism's contradictions.
- Published
- 2021
- Full Text
- View/download PDF
30. DEVELOPMENT OF AN EFFECTIVE METHOD FOR ISOLATING OF HYDROPHOBIN-TYPE PROTEINS FROM TRICHODERMA VIRIDE SUBMERGED CULTURE AND EVALUATION OF THEIR PROPERTIES
- Author
-
NIKITA KHRAPATOV, BORIS KOLESNIKOV, and MARK SHAMTSYAN
- Subjects
biosurfactants ,emulsifiers ,extraction ,foam-stabilization ,multiple regression analysis ,submerged cultivation of fungi. ,Chemical technology ,TP1-1185 - Abstract
Hydrophobins are low-molecular proteins with very high surface activity and great potential for application in food and pharmaceutical industries. In this study an efficient method for isolation of hydrophobin-type proteins from Trichoderma viride mycelia biomass and native liquid of culture medium was elaborated. Extraction buffer and parameters of the extracting agents, such as buffer pH value and its molarity, as well as extraction temperature and duration time were selected. Obtained proteins were purified and their molecular weight was determined as 8 ± 1 kDa. Surface active and foam stabilizing activities of obtained proteins were also determined. Surface activity of isolated hydrophobin-type proteins was compatible to the activity of sodium dodecil sulfate, while foam stabilizing effect was higher and the action was much longer then when sodium-caseinate or Tween-80 were used.
- Published
- 2019
31. Odontogenic cervico-facial cellulitis during pregnancy: about 3 cases
- Author
-
Zakaria Aziz, Salma Aboulouidad, Mohammed El Bouihi, Saad Fawzi, Mohammed Lakouichmi, and Nadia Mansouri Hattab
- Subjects
facial cellulitis ,odontogenic ,pregnancy ,extraction ,Medicine - Abstract
Pregnancy is considered as a risk factor for development, severity, and complications of odontogenic infections. Without adequate treatment, the infection can spread and threaten both the mother’s and the foetus lives. We aim to analyze the predisposing factors, diagnostic and therapeutic aspects of cervico-facial cellulitis during pregnancy, through a descriptive retrospective study conducted at oral and maxillofacial surgery department of Mohamed VI university hospital center at Marrakesh, between June 2017 and June 2019. A total of three patients; all patients were at their last trimester were recruited. Every patient was immediately given intravenous antibiotics, drainage was carried out under local anesthesia, and the causing tooth was removed. During hospitalization, one patient was referred to the gynaecology department for preterm labor, while the remaining two patients were discharged after the pus drainage has stopped. The possible compromise of oral health during pregnancy is well known, however severe odontogenic infections are rarely considered in the literature. It is essential to aggressively treat the gravid patient to minimize the risk of infection spreading to the facial spaces. Moreover, poor oral health in pregnancy has been implicated in adverse birth outcomes, specifically prematurity. We recommend upgrading communication between obstetrician and dentists so that regular routine dental visits are planned for pregnant patients during early stages of pregnancy in order to identify and manage the problem as early as possible.
- Published
- 2020
- Full Text
- View/download PDF
32. Natal teeth: report of two cases
- Author
-
Salma Aboulouidad, Zakaria Aziz, Mohammed El Bouihi, Saad Fawzi, Abdeljalil Abouchadi, and Nadia Mansouri Hattab
- Subjects
natal tooth ,extraction ,case report ,Medicine - Abstract
Presence of teeth at birth or within a month post-delivery is a rare condition. We report here 2 cases to highlight their clinical features and discuss their possible treatment. A 7- days old female newborn with two mandibular central incisors, noticed by the parents at birth, with complaint of continuous crying, inability to suck milk and causing discomfort to the mother. The left incisor was highly mobile justifying its extraction. The second case was a female newborn referred 2 hours after delivery, for a brownish highly mobile mandibular incisor noticed by the pediatrician. Extraction was immediately made to avoid the danger of aspiration. This phenomenon can lead to complications either local such as pain on suckling or general such as undernutrition or asphyxia by aspiration. The decision to maintain or remove these teeth should be assessed in each case independently, based on degree of mobility and interference with breastfeeding.
- Published
- 2020
- Full Text
- View/download PDF
33. A Different Pitch: Listening to Water Through Contemporary Art in a Time of Extraction
- Author
-
Ruth Beer and Caitlin Chaisson
- Subjects
sound ,extraction ,water ,Fine Arts ,Social Sciences - Abstract
This article addresses the intersections of water, extraction, and environmental justice through a consideration of sound in contemporary artworks by Ruth Beer, Rebecca Belmore, and Mia Feuer. Qualities of sound have been tied to environmental studies and assessment for decades, but these artists consider audio-visual and immersive situations that foster the ability to listen amidst ecological complexity.
- Published
- 2020
- Full Text
- View/download PDF
34. Green ultrasound-assisted extraction of astaxanthin from fermented rebon shrimp (cincalok) using vegetable oils as solvents☆
- Author
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Prayitno Dwi Imam, Dewi Eko Nurcahya, Pringgenies Delianis, and Brotosudarmo Tatas Hardo Panintingjati
- Subjects
astaxanthin ,fermented shrimp ,virgin coconut oil ,ultrasonication ,extraction ,Oils, fats, and waxes ,TP670-699 - Abstract
Cincalok is a typical food from West Kalimantan made from fermented rebon shrimp containing astaxanthin, the most potent antioxidant in nature. This study investigated an efficient method for extracting astaxanthin from the cincalok using vegetable oils as solvents. Olive, sesame, grape seeds, coconut, and virgin coconut oil were used as alternative solvents. The effect of various parameters on extraction yield was also studied. N-hexane and acetone were also used for comparison. Amplitude level and extraction time were the factors investigated concerning extraction yield. Comparative studies between traditional extraction methods and extraction assisted by ultrasonication have also been carried out. The astaxanthin content as total carotenoids in oil extract was analyzed using a UV-vis spectrophotometer with a standard external method. The optimum ultrasound-assisted extraction condition of astaxanthin from cincalok was 40% amplitude for 3 minutes, with 100.62 μg/g of astaxanthin extraction yield when used virgin coconut oil as a solvent. In this way, oils enriched with astaxanthin are produced.
- Published
- 2022
- Full Text
- View/download PDF
35. PHYSICOCHEMICAL CHARACTERIZATION AND ACCEPTABILITY OF SOME ARTISANAL MINT LIQUEURS
- Author
-
MIRELA SUCEVEANU, IRINA-CLAUDIA ALEXA, OANA-IRINA PATRICIU, LUMINIŢA GROSU, and ADRIANA FÎNARU
- Subjects
extraction ,maceration ,Mentha piperita ,physicochemical characterization ,sensory analysis ,valorization ,Chemical technology ,TP1-1185 - Abstract
The medicinal herb Mentha piperita L. has been used for hundreds of years for its remarkable medicinal properties. Due to its composition rich in essential oil, terpenes, flavonoids etc., the peppermint is commonly used in various fields for obtaining cosmetics, medicines, and also in the food industry. The aim of the present study consisted in developing accessible recipes for preparation of artisanal dessert mint liqueurs by different extraction variants and determining their physicochemical and sensory analyses. Four types of mint liqueurs were prepared by maceration of peppermint leaves in alcohol, varying the extraction parameters: time, temperature or by changing the order of ingredients addition. For the obtained artisanal liqueurs samples the following physicochemical characteristics were determined: dry extract, alcoholic strength, soluble solids, total acidity, fixed acidity, volatile acidity, density, conductivity and refractive index. The samples prepared were organoleptically analyzed by a multi-sensory approach (appearance and clarity, color, odor and aroma, taste) using the scoring method and the results revealed that the artisanal liqueurs obtained are well accepted by the consumers.
- Published
- 2018
36. Facteurs prédictifs de reconsultation et influence du dispositif de contention sur la récidive et le taux de recollage dix ans après la dépose orthodontique.
- Author
-
DE LAUNAY, Laure, GOUMY, Marie-José, SUBTIL, Fabien, and GEBEILE-CHAUTY, Sarah
- Abstract
Copyright of Orthodontie Française is the property of John Libbey Eurotext Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2020
- Full Text
- View/download PDF
37. PURIFICATION OF WATER SOLUBLE PROTEINS (2S ALBUMINS) EXTRACTED FROM PEANUT DEFATTED FLOUR AND ISOLATION OF THEIR ISOFORMS BY GEL FILTRATION AND ANION EXCHANGE CHROMATOGRAPHY
- Author
-
IMÈNE BOUALEG and AISSA BOUTEBBA
- Subjects
chromatography ,extraction ,isolation ,oilcake ,purification ,2S albumins ,water-soluble proteins ,Chemical technology ,TP1-1185 - Abstract
2S albumins are water-soluble seed storage proteins present in dicotyledonous plants, including legumes. In peanuts, 2S albumins have been identified as major allergens. In this work, we aimed to study these water soluble allergenic proteins. They were extracted in water from peanut defatted flour (oilcake). It was quantified by Bradford method. The total and insoluble proteins content was determined by Kjeldahl method (% P = N x 6.25). The crude 2S albumins were purified using gel-filtration chromatography. Anion exchange chromatography analysis was applied to isolate their isoforms. The recorded values for total and insoluble proteins are 45.49 % and 36.65 % consecutively. A value of 9.99 % was determined for water soluble proteins content which correspond to 20 % compared to the total proteins. Analysis by Sephadex G-75 chromatography of soluble extract gave two majors peaks in which, the Mr ~ 25 kDa peak was predicted to be pure 2S albumin fraction. Using DAEA-cellulose chromatography, two peaks were appeared from pure 2S albumins, it were predicted that 2S albumin isoforms theoretically represent the peanut major allergens Ara h2 and Ara h6. These approaches are the basis for further studies may involve immunological analysis to understand the impact of these biomolecules on peanut allergenicity.
- Published
- 2017
38. IMPACT DU PHENOMENE DU VIEILLISSEMENT IN VIVO DES OVULES DE LA CARPE ARGENTÉE (HYPOPHTHALMICHTHYS MOLITRIX) SUR LA PRODUCTION DES SEMENCES À LA STATION DE PISCICULTURE DE DEROUA (PROVINCE FKIH BEN SALAH, MAROC)
- Author
-
Fatima Zahra MAJDOUBI, Anouar OUIZGANE, Mustapha HASNAOUI, and Mohammed DROUSSI
- Subjects
Hypophthalmichthys molitrix ,ageing ,ovulation ,eggs ,fertilization ,extraction ,Deroua ,Morocco ,Environmental technology. Sanitary engineering ,TD1-1066 ,Environmental sciences ,GE1-350 - Abstract
The aim of our study is to evaluate the impact of ova retention in the body cavity of silver carp (Hypophthalmichthys molitrix) females after ovulation on their viability after stripping and on different development stages including mainly on the rate of fecundation, embryonic and larval development. To carry out this study of the effect of ova retention in the ovarian cavity, nine silver carp females were induced to spawn and their ova were stripped and fertilized after 30,60 and 90 minutes post-ovulation. The results indicated that fertilization and embryonic survival rates ranged respectively from 61,7 % and 61,5% at ovulation (T0) to 29,5% and 29,7% at 90 minutes post of ovulation (T90), while the survival rate of fry ranged from 87,3 % at T0 to 48,8 % at T90. In order to ensure the maximum viability of the ova of silver carp females reproduced artificially in the hatchery, it is recommended to strip and fertilize the eggs within 30 minutes after ovulation.
- Published
- 2017
39. De la plante aux effets biologiques de l'extrait : quand la démarche scientifique éclaire les usages.
- Author
-
Guinobert, I., Bardot, V., and Dubourdeaux, M.
- Abstract
Copyright of Phytothérapie is the property of John Libbey Eurotext Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
- Full Text
- View/download PDF
40. Towards a re-didactization literary texts: example of " The Goat Seguin " in the Algerian Manual 5th year of primary.
- Author
-
MEHDID, HIDAYET BENABADJI
- Subjects
NARRATIVE poetry ,GOATS ,FOREIGN language education ,STANDARD language ,SCHOOL year - Abstract
Copyright of Insāniyāt / Revue Algérienne d'Anthropologie et de Sciences Sociales is the property of Centre de Recherche en Anthropologie Sociale et Culturelle (CRASC) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
41. Extraction de la première molaire permanente et incidences orthodontiques.
- Author
-
Legris, S.
- Abstract
Copyright of Revue d'Orthopédie Dento-Faciale is the property of Parresia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
- Full Text
- View/download PDF
42. Reinventing the oilseeds processing to extract oil while preserving the protein☆
- Author
-
Carré Patrick
- Subjects
proteins ,antinutritional factors ,process ,extraction ,quality ,Oils, fats, and waxes ,TP670-699 - Abstract
The move towards more sustainable production and consumption patterns is a goal shared by a large part of society. In the oil-mill sector, whether it be animal feed or human food, this development should make it possible to improve the protein autonomy of the territories and to use proteins more efficiently. Current methods make some of the rapeseed proteins indigestible and leave most of the undesirable compounds from the seeds in resulting meals. Residual oil, fibrous envelopes, glucosinolates, phytic acid, phenolic compounds and oligosaccharides, as well as overcooking, however, have negative effects on the value of proteins. An important part of the article is devoted to reviewing these effects. Their extraction, combined with milder heat treatments, would provide excellent quality proteins to the market and generate value for the entire value chain. Efficient dehulling and mechanical extraction would be the prerequisites for this development. An ethanolic extraction revisited to exploit the secondary metabolites would then complete this process with, however, a limited effect on phytic acid. All these technologies have the advantage of not posing major acceptability problems. This development requires new investments in applied research to make this new approach to processing oilseeds possible and efficient.
- Published
- 2021
- Full Text
- View/download PDF
43. Optimization of Enzyme Assisted Extraction of Chondroitin Sulfate from Bohadschia argus by Response Surface Methodology
- Author
-
Ruensodsai Thanagorn, Panakkal Elizabeth Jayex, Teerapornnarong Prawpan, Rodiahwati Wawat, Sriariyanun Malinee, and Rattanaporn Kittipong
- Subjects
sea cucumber ,chondroitin sulfate ,response surface methodology ,papain ,extraction ,Environmental sciences ,GE1-350 - Abstract
Chondroitin sulfate is currently one of the bioactive compounds obtained from different natural materials with high benefit in human medical treatment and pharmaceutical. However, the natural concentration of chondroitin sulfate in high cost raw material is low and this situation makes the commercialization become difficult. This study focused on production of chondroitin sulfate isolated from Bohadschia argus using enzyme-assisted extraction methodology. Optimization experiments were conducted based on Response Surface Methodology (RSM) using Box–Behnken design (BBD). Three important extraction parameters, including enzyme concentration (X1: 0.05-0.5 %), Time (X2: 0.25–3 h), and temperature (X3: 55–65 °C) were varied to obtain maximum chondroitin sulfate yields. The RSM optimized model obtained from statistical analysis presented the high correlation coefficiency (R2) at 0.7508, advocating the significance of the model. The optimum extraction conditions were selected as enzyme concentration of 0.48% with extraction time of 1.01 h. at an extraction temperature of 56.53°C. Under these conditions, the experimental yield of chondroitin sulfate was 415.59 mg/100g dry, which is in good agreement with the value predicted by the model.
- Published
- 2021
- Full Text
- View/download PDF
44. New approch of opinion analysis from big social data environment using a supervised machine learning algirithm
- Author
-
Saidi Wiam, El Abderahmani Abdellatif, and Satori Khalid
- Subjects
opinion mining ,big social data ,machine learning ,classification ,extraction ,svm ,Environmental sciences ,GE1-350 - Abstract
Sentiment analysis is a very substantial area of research in our environment. Many studies have focused on the topic in recent years. It has rapidly gained interest due to the unusual volume of opinion-bearing data on the Internet (Big Social Data). In this paper, we focus on sentiment environment analysis from Amazon customer reviews shared by a machine learning based approach. This process starts with the collection of reviews and their annotation followed by a text pre-processing phase in order to extract words that are reduced to their root. These words will be used for the construction of input variables using several combinations of extraction and weighting schemes. Classification is then performed by a supervised Machine Learning classifier. The results obtained from the experiments are very promising.
- Published
- 2021
- Full Text
- View/download PDF
45. A extração da flora e fauna nativas na Amazônia brasileira – uma segunda apreciação
- Author
-
José Augusto Drummond and Claudia de Souza
- Subjects
extraction ,Amazon Region ,local development ,extractive reserves ,faunal resources ,floral resources ,Environmental sciences ,GE1-350 - Abstract
Defines low technology extraction, practiced in many parts of the Brazilian Amazon region. Examines 16 recurrent analytical and conceptual topics present in academic and political discussions about that type of extraction. Evaluates several public policies, community initiatives, partnerships and other forms of support given to extractors. Points out in each topic the perspectives of prosperity, collapse, stagnation or continued existence of low technology extraction and of the people who practice and depend on it.
- Published
- 2016
- Full Text
- View/download PDF
46. APPLICATION OF RESPONSE SURFACE METHOD ON PURIFICATION OF GLUCOMANNAN FROM AMORPHOPHALLUS ONCOPHYLLUS BY USING 2-PROPANOL
- Author
-
DYAH H. WARDHANI, FATONI NUGROHO, M. MUSLIHUDIN, and NITA ARYANTI
- Subjects
Amorphophallus oncophyllus ,extraction ,glucomannan ,2-propanol ,purification ,response surface methods ,Chemical technology ,TP1-1185 - Abstract
Glucomannan purification methods affect the properties of mannan and have influence to the scope of glucomannan applications. Combination between ethanol solution and thermal treatment is commonly method applied to purify glucomannan obtained from Amorphophallus sp. However, 2-propanol was reported to be more effective in removing glucomannan impurities including the starch and the carotenes. The objective of this research was to study the effect of 2-propanol concentration, temperature and time as well as their interaction on purification of glucomannan obtained from Amorphophallus oncophyllus by using response surface methods. The relevant parameters (glucomannan content, starch content, degree of whiteness, yield) were investigated in order to establish mathematical model. The results showed that the linear models were reliable to predict the responses (R2 ≥ 0.926). Temperature was a significant variable for the all responses. This purification method improved the absorbance of the functional groups at ~2900 cm-1 of stretching of C-H vibration and ~1730 cm-1 of acetyl group which is responsible on glucomannan solubility. However, this method reduced the absorbance of the functional groups at ~1650, ~1070, ~1020 and 900 - 800 cm-1 of absorbed water or protein, C-O alcohol and -glucosidic and -mannosidic linkages, respectively. The morphology observation revealed that this purification method achieves separation and removal of impurities which encapsulated the glucomannan and subsequently released the glucomannan granules. The highest content of glucomannan obtained in this study was 72.30 % when 90 % 2-propanol at 75 °C for 180 min was used for purification.
- Published
- 2016
47. Sphingolipids: promising lipid-class molecules with potential applications for industry. A review
- Author
-
Miazek, K., Lebecque, S., Hamaidia, M., Paul, A., Danthine, S., Willems, L., Frederich, M., De Pauw, E., Deleu, M., Richel, A., and Goffin, D.
- Subjects
Sphingolipids ,chemical structure ,extraction ,analysis ,industrial uses ,Biotechnology ,TP248.13-248.65 ,Environmental sciences ,GE1-350 - Abstract
Introduction. Sphingolipids are a group of lipid molecules, the focus on which has been gradually increasing during recent years. This review presents sphingolipids, as valuable compounds with a high potential for industry. Literature. Structures of sphingolipids are described and their natural sources are presented. Different methods for extraction, purification and structural characterization of sphingolipids are evaluated. Activity of sphingolipids towards various microorganisms is discussed and methods for chemical modifications of natural sphingolipids to obtain novel properties are depicted. Finally, applications for implementing sphingolipid molecules in food, cosmetic, pharmaceutical or medical industry are proposed. Conclusions. Sphingolipids are molecules of high impact and their importance will inevitably increase in the future.
- Published
- 2016
48. Valorisation de la biomasse : Extraction, caractérisation et hydrophobisation des hémicelluloses
- Author
-
Najjoum, Nicole, Benali, Mohammed, Castignolles, Patrice, and Grimi, Nabil
- Subjects
Matériaux d'emballage ,Biomasse ,Hémicellulose ,Extraction ,Hydrophobisation ,Valorisation - Published
- 2023
- Full Text
- View/download PDF
49. Contribution to improvement of the traditional extraction of olive oil by pressure from whole and stoned olives by addition of a co-adjuvant (talc)
- Author
-
Titouh Khayreddine, Mazari Azzedine, and Aït Meziane Mohand Zine
- Subjects
co-adjuvant ,extraction ,olive oil ,pressure ,stoning ,Oils, fats, and waxes ,TP670-699 - Abstract
The olive growing is one of the strategic sectors of the Algerian economy. Traditional olive culture located in the mountains of Kabylia offers typical oil widely preferred by a large part of the Algerian consumers. However, this ancestral culture risks not only abandonment but suffers much more from uncontrolled of the good practices surrounding this local product requiring a valorization accompanied by improvement. Indeed, the difficulty to extract the total oil contained in the fruit is one of the main obstacles of the extraction method particularly by pressure. Nevertheless, some actions as the addition of co-adjuvant during the malaxing process allow improving efficiency of the extraction process. Our results indicate that the addition of 2.5% of talc as a co-adjuvant to a moistless paste obtained from whole olives significantly improves the oil yield by about 4.4% without altering the acidity compared to the control. Similarly, stoning improves the moisture of the pressed mass although without improving yield of the oil characterized by a slight decrease in acidity compared to other extracted oils. Therefore, our results confirm the beneficial effect of talc on the extraction of olive oil and contribute to the improvement of the traditional extraction by pressure to enhance the value of this local product.
- Published
- 2020
- Full Text
- View/download PDF
50. Extraction of gold in a centrifugal field of fluid rotation
- Author
-
Salomatova Svetlana
- Subjects
concentration ,centrifugal flotation ,mineral particles ,hydrophobic properties ,concentrate ,extraction ,Environmental sciences ,GE1-350 - Abstract
With the samples of the gold-antimony ore processing products of the Sentachan deposit, flotation experiments were carried out on a laboratory centrifugal flotation machine with peripheral concentrate discharge (CFM) and on a laboratory mechanical flotation machine (FM). The selectivity of falling of mineral particles from the flotation mineralized foam flowing along the inclined plane after flotation under different modes (with and without the use of a collector) was investigated; it was shown that the use of a collector can regulate the intensity and selectivity of the falling of material from the foam layer. It was found that the combination of the effect of the centrifugal force of fluid rotation and the hydrophobic properties of minerals makes it possible to enhance the selectivity of the separation of minerals; during flotation in a centrifugal flotation machine, it is possible to carry out cleaning operations in order to improve the quality of the concentrate.
- Published
- 2020
- Full Text
- View/download PDF
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