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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
121

Estudio de prefactibilidad para la instalación de una planta productora de aceite de oliva (Olea europaea) extra virgen en spray

Castañeda-Rieckhof, Lucia, Fiocco-Bertello, Alejandro Antonio January 2017 (has links)
virgen en spray para cocinar y para consumo directo. Utilizará una novedosa tecnología que evita el contacto entre el gas y el aceite y se orienta a un segmento de la sociedad que busque un producto saludable y de propiedades organolépticas agradables. Con relación al mercado para este producto el consumo interno va en aumento gracias a una tendencia creciente a consumir productos de estas características, proyectando al 2021 una demanda potencial de 807 toneladas de este producto. Sin embargo, considerando la competencia en el sector al que se dirige este producto y su intención e intensidad de compra, estimamos que la demanda del proyecto para el 2017 será de 21.46 toneladas del producto y para el 2021, 53 toneladas. Respecto a la localización de la planta, la provincia más adecuada luego de realizar un ranking de factores es Arequipa. Esto se debe a que, junto con Tacna, su producción de aceitunas es la más alta del Perú y la cercanía a la materia prima es vital. Su mayor proximidad a Lima a comparación a Tacna es lo que la define como el lugar más adecuado. La planta se localizará en el distrito Arequipa. / Trabajo de investigación
122

A pilot study to examine the feasibility and acceptability of assessing the effect of topical oils on term babies' skin barrier function : the OBSeRvE (Oil in Baby SkincaRE) Study

Cooke, Alison January 2015 (has links)
Background: The differential effects of using topical oils for the prevention or treatment of baby dry skin on skin barrier function may contribute to the development of childhood atopic eczema. Prevalence of atopic eczema has increased from 5% of children aged 2 to 15 years in the 1940s, to approaching 30% more recently. This increase cannot be attributed to genetic changes. It is likely that increases stem from environmental factors, including the increased use of some inappropriately formulated commercial and natural baby skincare products. Midwives, health visitors and other maternity service health professionals, in the UK, routinely recommend the use of olive oil and sunflower oil for baby dry skin or massage, but the effect of these oils on newborn baby skin has not been studied. Aim: The aim of this research was to assess the feasibility and acceptability of testing the hypothesis that the regular application of sunflower oil, when compared to no oil or olive oil, had an effect on skin barrier function of newborn term babies. Study Design: A pilot, assessor-blinded, single centre, three-arm, randomised controlled trial, with nested qualitative component, underpinned by post-positivism. Methods: Quantitative methods were used to establish proof of concept that the use of topical oils had some effect on newborn baby skin barrier function, and to assess the feasibility of trial processes and parameters. Qualitative methods were used to explore the acceptability to parents of having a newborn baby participating in a randomised controlled trial, and trial design and procedures. The study was conducted in St. Mary’s hospital, a large teaching hospital in North West England. Data were collected between September 2013 and August 2014.The randomised controlled trial included 115 babies who were randomised to three groups: sunflower oil, olive oil and no oil, using a computer-generated varied size block randomisation with concealed allocation. Parents of babies randomised to the oil groups were blinded to which oil they were allocated. Data were collected using standardised case report forms for demographic and clinical observation data, weekly telephone questionnaires and a follow-up questionnaire, informed by previous baby skincare trials. The qualitative study encompassed semi-structured interviews, conducted within six months of birth. The sample was a subset of the trial participants, purposively sampled to incorporate a mix of treatment groups and positive and negative experiences derived from the follow-up questionnaire. Data also included two open-text questions from the follow-up questionnaire. Quantitative data were managed using IBM SPSS Statistics versions 20 and 22 and analysed descriptively. Qualitative data were managed in NVivo 10 and analysed using Framework Analysis. Results: The pilot study found that a definitive randomised controlled trial is not the optimal next step. A longitudinal observational study and further mechanistic work is recommended. Recruitment was challenging and loss to follow-up was higher than anticipated. Protocol adherence was reasonable and the study was acceptable to parents. Some statistically significant results were obtained, which must be interpreted with caution as the study was not powered to detect such a difference. These results showed that both oils may impede the development of the skin barrier function from birth; clinical importance of the results is not known. Conclusion: A longitudinal observational study is required, which maps the diagnosis of atopic eczema with environmental factors such as the use of baby skincare products from birth. Mechanistic work is also required to consider the optimal skincare formulation. As any intervention should do more good than harm, it would be wrong to support the recommendation of topical olive oil or sunflower oil for newborn baby dry skin or massage, based on the study data.
123

Avaliação do potencial antioxidante in vitro de azeites de oliva identificados como extra virgem produzidos no Brasil / Evaluation of in vitro antioxidant potential of olive oils identified as extra virgin produced in Brazil

Baroni, Naiara Aparecida Franco, 1987- 27 August 2018 (has links)
Orientador: Juliana Alves Macedo / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos / Made available in DSpace on 2018-08-27T12:01:55Z (GMT). No. of bitstreams: 1 Baroni_NaiaraAparecidaFranco_M.pdf: 1466937 bytes, checksum: 5a517dbdb43e197ac98d726b669f3c2d (MD5) Previous issue date: 2015 / Resumo: O azeite de oliva virgem extra é considerado um alimento funcional com importantes propriedades biológicas relacionadas à elevada concentração de ácido graxo monoinsaturado. Estudos recentes indicam que os componentes minoritários na composição do azeite têm sido muito associados com benefícios à saúde, muito além do conteúdo de ácido oleico, destacando-se os compostos fenólicos, principalmente hidroxitirosol e tirosol. A região na qual as oliveiras são cultivadas pode ter influência direta na composição do azeite, principalmente no que se refere aos compostos minoritários. O objetivo deste trabalho foi avaliar se o potencial antioxidante dos azeites de oliva produzidos no Brasil (ArbequinaRS, ArbequinaMG e Maria da Fé) se assemelha ao dos azeites europeus (ArbequinaMed e Gallo®) tradicionais no mercado brasileiro. O perfil de ácidos graxos mostrou que a amostra Maria da Fé assemelha-se à amostra referência Gallo®, apresentando as maiores concentrações de ácido oleico. O teor de tocoferóis foi maior nas amostras ArbequinaRS e Maria da Fé. Quanto à determinação de fenólicos totais, pelo método de Folin-Ciocalteu, destacaram-se a ArbequinaRS e ArbequinaMed. Esta também apresentou maior concentração de hidroxitirosol, enquanto que, a referência Gallo® apresentou maior teor de tirosol. A capacidade antioxidante foi avaliada por métodos de sequestro de radicais, ORAC e DPPH, este permitiu identificar diferença estatística entre as amostras testadas. Dentre as amostras de variedade Arbequina, destaca-se o azeite produzido na região Sul do Brasil, equiparando-se estatisticamente ao comercial de origem mediterrânea; foi observada uma correlação positiva entre conteúdo de fenólicos totais e a capacidade antioxidante pelo método de sequestro de radical DPPH. O método ORAC não mostrou diferença estatística significativa entre as amostras. A atividade biológica foi avaliada através da mensuração da atividade de enzimas endógenas, catalase e superóxido dismutase, do arsenal antioxidante de hepatócitos humanos. Após o ensaio MTT de viabilidade celular foram definidas duas concentrações de estudo para os testes enzimáticos: 0,5 e 2mg/mL. De forma geral, nos ensaios de ativação do sistema celular endógeno antioxidante de hepatócitos, dentre os azeites testados os de maior potencial biológico foram os brasileiros, com importante destaque para a variedade Arbequina produzida no Rio Grande do Sul, ArbequinaRS / Abstract: The extra virgin olive oil is considered a functional food with important biological properties related to the high concentration of monounsaturated fatty acid. Recent studies indicate that minor components in olive oil composition have been very associated with health benefits, far beyond the content of oleic acid, highlighting the phenolic compounds, especially hydroxytyrosol and tyrosol. The region where the olive trees are grown may have direct influence on oil composition, especially with regard to minority compounds. The objective of this study was to evaluate the antioxidant potential of olive oils produced in Brazil (ArbequinaRS, ArbequinaMG and Maria da Fé) is similar to European oil (ArbequinaMed and Gallo®) traditional in the Brazilian market. The fatty acid profile showed that the sample Maria da Fé resembles the reference sample Gallo®, with the highest concentrations of oleic acid. The tocopherols content was higher in ArbequinaRS and Maria da Fé samples. The determination of total phenolic by the Folin-Ciocalteu method, the highlights were the ArbequinaRS and ArbequinaMed. This also showed a higher concentration of hydroxytyrosol, while the Gallo® reference showed greater tyrosol content. The antioxidant capacity was evaluated by sequestration methods of radicals, ORAC and DPPH, this allowed us to identify significant differences between the samples tested. Among the samples of Arbequina variety, stand out from the oil produced in southern Brazil, equating statistically the trade of Mediterranean origin; was observed a positive correlation between total phenolic content and antioxidant activity by DPPH radical sequestration method. The ORAC method was not significantly different between the samples. The biological activity was evaluated by measuring the activity of endogenous enzymes of the antioxidant arsenal of human hepatocytes: superoxide dismutase and catalase. After the MTT assay cell viability was defined two concentrations to study enzyme tests 0,5 and 2 mg/mL. In general, the antioxidant endogenous cellular system hepatocyte activation assays, among the oils tested the highest biological potential were Brazilians, with major emphasis on the Arbequina variety produced in Rio Grande do Sul, ArbequinaRS / Mestrado / Nutrição Experimental e Aplicada à Tecnologia de Alimentos / Mestra em Alimentos e Nutrição
124

Functional analysis and elimination of SIB in an olive baboon (Papio hamadryas anubis).

Dorey, Nicole R. 08 1900 (has links)
Self injurious behavior (SIB), such as self-biting and head-banging, has been reported to occur in approximately 10% of captive, individually housed primates (Novak, Kinsely, Jorgensen, and Hazen, 1998). Accounts of the causes of SIB range from environmental to physiological. However, to date, no researchers have investigated the possible influence of social consequences, delivered by handlers and keepers, in the maintenance of SIB. There is only one research report showing that self-injury can be shaped in primates by the manipulation of food as a reinforcing consequence for the animal's behavior. The current study investigated the effects of social contact as potentially reinforcing consequences for the SIB displayed by an olive baboon (Papio hamadryas anubis). Results indicated that the behavior was maintained by attention from humans. As treatment, reinforcement was arranged for an appropriate alternative attention-getting behavior, resulting in increases in the appropriate alternative behavior and decreases in SIB.
125

Marine bacteria as a potential source for novel antimicrobial compounds

Segopa, Ellen Kelebogile January 2021 (has links)
>Magister Scientiae - MSc / The high rate of rediscovery of known compounds has led to a decline in the discovery of novel natural products. The high biodiversity of organisms growing in extreme conditions such as oceans has led to the increased interest by researchers for their use as a source of novel natural products. Marine bacteria are known for their extensive biosynthetic capacity to produce diverse natural products, which are suitable for various biotechnology applications such as in agriculture, for treatment of fungal plant pathogens, and as antibiotics, for treatment of bacterial infections. This study aimed at discovering novel secondary metabolites from marine bacteria previously associated with novel marine invertebrate species endemic to the South African coast. The methodologies used in this study included a bioassay guided fractionation coupled to genome sequencing and mining. For the bioassay guided fractionation approach, the study first focused on screening marine bacteria for antimicrobial activity when cultured on 4 different media, against fungal strains previously shown to be virulent olive trunk pathogens. In parallel, the bacterial isolates with the most inhibitory activity against the fungal pathogens were also screened for antimicrobial activity against 4 indicator strains including Gram-negative Escherichia coli 1699 (E. coli), Pseudomonas putida, and Gram-positive Staphylococcus epidermidis ATCC14990, and Bacillus cereus ATCC10702. One of the marine bacterial isolates, PE6-126, showed diverse antimicrobial activity including antibacterial and antifungal activity against the tested strains. The genome sequencing data revealed that this isolate was B. cereus based on the average nucleotide identity (ANI) (>99%) to reference strains. antiSMASH analysis of the genome revealed nine predicted secondary metabolite clusters including bacteriocins (2), non-ribosomal peptide synthetase (NRPS) (2), siderophore (1), sactipeptide (1), betalactone (1), linear azol(in)e-containing peptides (LAP) - bacteriocin (1) and a terpene (1). Some of these pathways had low to no sequence similarity to known pathways, indicating the potential of these pathways to produce novel compounds. One of the pathways showed very high sequence similarity to the thuricin CD pathway in Bacillus thuringiensis. Considering that thuricin CD has been reported to have antimicrobial activity against B. cereus (ATCC1072), it was hypothesised that it could also be produced by PE6-126. However, the antimicrobial extract from PE6-126 was tested for sensitivity to proteinase K and heat treatment, which thuricin CD is known to be sensitive to. The results revealed that the antimicrobial activity was not lost after treatment, implying that a different metabolite could be responsible for the anti-B. cereusactivity. In addition, PE6-126 initially displayed antimicrobial activity against a multi-drug resistant E. coli 1699, suggesting some of the antimicrobial compound/(s) produced by this strain could potentially be novel. The bioassay-guided fractionation approach coupled to Liquid Chromatography Mass Spectrometry (LC-MS) did not lead to identification of the antimicrobial compound/(s), therefore it remains a question whether the secondary metabolite pathways predicted by antiSMASH lead to the production of the active compound/(s).The results from this study showed that even well studied species have the potential to synthesize as yet undescribed compounds, based on the novelty of some of the pathways. This study highlights the importance of employing a genome-guided approach in drug discovery, as there may be many novel compounds to discover from biosynthetic pathways that have not yet been characterised. Further research is needed to identify the antimicrobial compound/(s) produced by PE6-126.
126

Breaking Down Binaries : Gender Subversion in Olive Schreiner’s "Undine" and "The Story of an African Farm"

Van Biljon, Lana January 2020 (has links)
This study investigates a thus far neglected aspect of Olive Schreiner’s feminism, namely her subversion of Victorian gender models in her early novels, Undine and The Story of an African Farm. In order to determine what is being subverted a brief outline is first provided of the nature of traditional male and female Victorian gender characteristics; thereafter, the key arguments of Gender Theory are provided, the cornerstone of which is that gender is a social construct and not determined by biology. Analysis of Undine focusses on Schreiner’s eponymous heroine’s subversion of female gender roles, finding that Undine’s subversion is incomplete, due to her repeated lapses into conventional behaviour, seen mainly in her need to fulfil a role of service. In addition, details in Undine are linked to biographical aspects of Schreiner’s own life as many critics have made a link between Schreiner’s fiction and instances in her life. In The Story of an African Farm attention is given to both female and male gender subversion. Female gender subversion is analysed in the character Lyndall who deviates from accepted female characteristics of women as meek and docile, while discussion also focusses on her more conventional cousin, Em, who by acting as her foil, highlights Lyndall’s subversiveness. Although in comparison to Undine, Lyndall shows great progress in her ability to free herself from traditional roles for women, she remains held back by her inability to break free from the idea that service to something was an inherent part of women’s natures. Finally, Schreiner’s most radical work regarding gender is found in connection with her male characters, Gregory Rose and Waldo. While Schreiner shows the constructed nature of male gender models in her characterisation of Gregory who identifies more with the female gender, Waldo avoids gender categories completely, aligning himself with neither femininity nor masculinity, by finding an “escape” from these artificial social constructs in the natural world. / Dissertation (MA)--University of Pretoria, 2020. / English / MA / Unrestricted
127

Electric Modernism

Haley Anne Larsen (10667997) 07 May 2021 (has links)
<p>This dissertation traces invocations and theories of electric power in modernist literature by women, showing how four modernist authors—Edith Wharton, Hilda Doolittle (H.D.), Olive Moore, and Jean Rhys—deploy electricity in their fiction and highlight its varied and contradictory cultural meanings. Modernist literature by women leverages the open and strange impressions from the era of what electricity might mean, so that authors might make their own arguments about where artistic impulses originate, how homes would change when they became wired, how modernization would change modernist art forms, or why some social spaces gleam brighter than others. Edith Wharton and Jean Rhys highlight cultural and class system dynamics with their electric metaphors and electrically wired settings, in which they fuse mental states with modern atmospheres. H.D. and Olive Moore explore how women experience artistic inspiration, as either a transcendent space of unlimited possibility for the former, or as proof of the limitations of gender for the latter. </p>
128

Catalytic Pyrolysis of Olive Mill Wastewater Sludge

Abdellaoui, Hamza 01 May 2015 (has links)
Olive mill wastewater sludge (OMWS) is the solid residue that remains in the evaporation ponds after evaporation of the majority of water in the olive mill wastewater (OMW). OMWS is a major environmental pollutant in the olive oil producing regions. Approximately 41.16 wt. % of the OMWS was soluble in hexanes (HSF). The fatty acids in this fraction consist mainly of oleic and palmitic acid. Catalytic pyrolysis of the OMWS over red mud and HZSM-5 has been demonstrated to be an effective technology for converting this waste material into fuel. Red mud-catalyzed pyrolysis gave higher organics yields than the HZSM-5 catalysis. The viscosity as well as the oxygen content of the catalytic pyrolysis oils were significantly lower than those of the non-catalytic oil. The reaction pathways of red mud and HZSM-5 were different. The catalytic pyrolysis of the HSF gave an acidic oil with low viscosity and high energy content, and was nitrogen and sulfur free, whereas the catalytic pyrolysis of the solid residue after hexanes extraction (SR) gave an oil with higher viscosity, close to neutral pH, lower energy content, and had high nitrogen content and traces of sulfur.
129

Multimodal sexual signaling and mating strategies in olive baboons and Japanese macaques / オリーブヒヒとニホンザルにおける多様な性的シグナルと交尾戦略

Rigaill, Lucie Marie Louise 23 March 2017 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(理学) / 甲第20218号 / 理博第4303号 / 新制||理||1618(附属図書館) / 京都大学大学院理学研究科生物科学専攻 / (主査)教授 古市 剛史, 教授 Fred Bruce BERCOVITCH, 教授 平井 啓久 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DGAM
130

The Effect of Destoning and Enzymatic Pretreatments on the Biofuel Production from Olive Cake

Tai, Patrick 01 July 2018 (has links) (PDF)
More than 16,000 tons of olive cake was produced in the United States in 2017. Olive cake is a by-product of olive oil extraction, which has limited animal feed potential, and poses an environmental threat when landfilled due to its high organic load and polyphenol content. This residue has potential for biofuel (bioethanol and biomethane) production because it is rich in polysaccharides such as pectin, hemicellulose, and cellulose. Yet, olive cake contains olive stones that can impede its conversion to biofuel. Therefore, two methods of destoning, centrifugation and screening by horizontal screw press, were first compared. Both methods removed an equal percentage of stones (95%), but centrifugation partitioned the majority (57 – 79%) of digestible solids (olive pulp) with the stones. Then, two strategies were compared to maximize both biomethane and bioethanol production; enzymatic conversion of insoluble to soluble carbohydrates and destoning by screening. After 30 days of anaerobic digestion at 35 °C, both the enzymatically pretreated and the destoned olive cakes produced similar amounts of methane (~295 mL CH4/g VS), 42% more than the control (209.5 mL CH4/g VS). The biogas produced was composed of 60-70% methane. A comparison of biomethane yields with a broad range of agricultural residues demonstrated olive cake’s suitability for biomethane production. The digestate, residue from the anaerobic digestion, have high Kjeldahl nitrogen content (3.6%, db) and low polyphenol concentration (0.02 mg GAE/g), which then qualify it as an ingredient for soil amendment. Ethanol production investigations showed that after 3 days of fermentation at 32 °C, only the destoned and enzymatically pretreated olive cake produced ethanol (1.3 mg/mL). Acetic acid, an inhibitor of ethanol production, was present in all samples broth, suggesting microbial contamination was present. These results provide evidence that olive cake can be diverted from landfills to be converted into a biofuel. Sustainable pretreatments such as destoning and enzymatic pretreatment increase biomethane yield. The digestate created from the anaerobic digestion of olive cake can be used as a soil amendment, adding further value to olive cake.

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